Air-Cooled Rotary Screw Chillers - Daikin Applied

Product Manual PM ALS-5

Air-Cooled Rotary Screw ChillersModels ALS 141C to ALS 218C120 to 210 Tons, 420 to 735 kWHCFC-2260 Hz

2

Table of ContentsIntroduction ............................................................................................................. 3Customer Benefits ................................................................................................... 4Controls ................................................................................................................... 6Design Advantages ................................................................................................ 10Selection Procedures ............................................................................................. 12Performance Adjustment Factors .......................................................................... 13Performance Data .................................................................................................. 15Part load Performance ........................................................................................... 17Pressure Drop ........................................................................................................ 18Sound Data ............................................................................................................ 19Electrical Data ....................................................................................................... 23Field Wiring Diagram............................................................................................ 30Physical Data......................................................................................................... 31Dimensions, ALS .................................................................................................. 32Installation and Application................................................................................... 34Chilled Water Systems .......................................................................................... 42Electrical Connections........................................................................................... 46Remote Evaporator................................................................................................ 46Dimensions, Remote Evaporator........................................................................... 53Standard Features .................................................................................................. 55Optional Features .................................................................................................. 57Specifications ........................................................................................................ 59

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Remote evaporator applications

are not included in ARI Program

Our facility is ISO Certified

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Document: PM ALS-5

Revision: September 2001

Replaces: PM ALS-4

ALS 141C – 218C Product Manual ALS-5

Quay" is a registered trademark of McQuay International 2001 McQuay International

covers McQuay International products at the time of publicationght to make changes in design and construction at anytime without notice"

Product Manual ALS-5 ALS 141C – 218C 3

Introduction

The McQuay ALS air-cooled chillers are equipped with McQuay single-rotor screwcompressors, high efficiency lanced condenser fins, multi-circuit DX evaporator andfuzzy logic MicroTech control theory to offer the utmost in quiet and efficientoperation.

The vintage "C" chillers are equipped with state-of-the-art solid state startersto provide stepless acceleration, controlled deceleration, and advanced

motor/compressor protection features. McQuay is the only manufacturer toprovide this advanced technology on air-cooled chillers.

UNSURPASSED EFFICIENCY• Single-screw compressor design• Electronic expansion valve control• Built-in economizer• High efficiency lanced condenser fins

QUIET OPERATION• Tuned discharge chamber• Composite gaterotor material• Liquid refrigerant-cooled motor• Virtually vibration-free operation

OUTSTANDING RELIABILITY• Rugged compressor design• Solid State Starters for smooth acceleration and deceleration• Low thrust loads on bearings• Advanced composite gaterotor material• Liquid refrigerant-cooled motors• Multiple compressors with independent refrigerant circuits• Proactive control logic• Full factory run-testing for trouble-free operation• McQuayService start-up

SUPERIOR CONTROL LOGIC• Precise control and improved efficiency with fuzzy logic• Easy to read 32-character LCD display• Remote PC monitoring capability• Open Protocol interface with virtually all BMS• Superior reliability under extreme operating conditions

4 ALS 141C – 218C Product Manual ALS-5

Customer Benefits

Unsurpassed Efficiency• Zero clearance fit between the two gaterotors and main screw rotor virtually eliminates

leakage between the high and low-pressure sides during compression. Special gaterotormaterial made from an advanced composite, temperature stable material makes a zeroclearance design possible.

• An internal economizer system enhances the unit's refrigeration effect providing moreBTUs per pound of refrigerant circulated. The result is higher efficiency and loweroperating costs when compared to typical chillers without economizers.

• The ALS air-cooled chiller is equipped with the most advanced means of refrigerantflow control available. An electronic expansion valve coupled with MicroTech fuzzylogic control provides excellent operating efficiencies both at full and part loadoperation.

Figure 1, StarGate Compressor Cutaway


Outstanding Reliability Features• Full factory testing of the unit with water hookups provides a trouble-free start-up.

Extensive quality control checks during testing means that each equipment protectionand operating control is properly adjusted and operates correctly before it leaves thefactory. Factory installed options minimize field expenses and startup labor.

• The rugged design of the single-screw compressor with its compliant gaterotors allowsit to tolerate liquid slugging. The ALS screw chiller will start and operate underconditions that would destroy a reciprocating compressor.

• The elimination of many moving parts such as pistons, valves, and connecting rodsfound on reciprocating compressors results in the enhanced reliability of the single-screw compressor.

• Due to symmetrical compression taking place on both sides of the main screw rotor,balanced forces result in the elimination of the large thrust loads inherent in twin-screwcompressors. Very low loading enhances the bearing and compressor reliability.

• Integral to the basic design of the single-screw compressor, the main screw rotor shaftand the gaterotor shafts cross at right angles in the compressor. The result is amplespace to locate heavy duty bearings and increase compressor reliability since nolimitations are placed on bearing design as found in twin-screw compressors.

• The compressor motor on the ALS screw chiller is liquid refrigerant cooled, allowingmotor operation at lower temperatures, enhancing system reliability and motor lifewhen compared to suction or discharge gas cooled designs.

• Recent technological advancements have made available a composite material thatprevents premature wear on the gaterotor. The composite material is made from amaterial designed for strength, temperature stability and durability.

Unmatched Serviceability• Field serviceability has not been sacrificed to meet design performance objectives on

the ALS chiller. Inspection covers allow for an excellent visual inspection of the mainscrew and gaterotors. Compressors are equipped with suction and discharge servicevalves.

• Compressors are located on the outside edges of the base allowing ready access.

Standard Solid State StartersThe addition of solid state starters as standard (a McQuay exclusive) on the "C" vintageunits takes a giant step forward in motor/compressor protection from failures from machineor electrical faults and includes self-diagnostics, metering and display. The starters providesmooth, slow stepless acceleration and controlled slow deceleration, reducing mechanicaland electrical stress for even greater compressor/motor life. Some of the informationavailable to the operator or service technician on each starter LED display follows:

Operating Messages Fault MessagesLine voltage not present System power not three phase

Voltage present, starter ready Phase sequence incorrectMotor accelerating Line frequency less than 25 HzMotor at full speed Line frequency more than 72 Hz

Motor at full speed, ramp time expired Excessive current unbalanceStop command received, motor decelerating Operating parameters lostThermal overload has reached 90% to 99% No current after "Run" commandThermal overload at 100%, motor stopped Undercurrent trip occurred

Thermal overload reduced to 60%, motor can restart Overcurrent trip occurredPasscode enabled Control power too lowPasscode disabled Motor stalled during acceleration

Thermal overload content in percentage External fault


Controls

MicroTech , The Ultimate Control System• A fuzzy logic control system is employed in the ALS screw chiller that optimizes the

suction line superheat and the positioning of the electronic expansion valve at allcompressor capacities resulting in maximized unit operating efficiencies. Fuzzy logiccontrol is based on approximate reasoning that maintains tighter control of the system.

• The MicroTech chiller controller, already proven superior to all other chiller controlsystems on reciprocating and centrifugal chillers, is employed in the ALS screw chiller.This advanced microprocessor-based control maintains a precise and stable leavingevaporator temperature set point. Utilization of fuzzy logic means compressor cyclingis minimized, reducing wear on both compressor and starting components.

• Stand-alone unit controls designed with the system operator in mind provide access tothe unit temperatures, pressures, set points, operating states, schedules, and alarmmessages. The MicroTech controller includes password protection to guard againstunauthorized or accidental setpoint or parameter changes.

• Complete instrumentation with state-of-the-art pressure transducers, temperaturesensors and optical oil level sensors for unparalleled operator information anddiagnostics.

• Superior head pressure control that maximizes unit efficiency by determining optimumcondenser fan operation. At least 5 and as many as 7 stages of heat rejection per circuitare provided.

• An optional Remote Monitoring and Sequencing (RMS) panel provides monitoring andcontrol of remote chillers via a single twisted pair of wires. The RMS panel allows theuser to access information such as unit status, temperatures and pressures, all controlset points, alarm conditions, time and date of alarm conditions, as well as the ability toclear alarms remotely. Up to three chillers can be sequenced and monitored from oneRMS panel.

• A personal computer equipped with optional MicroTech Monitor software can be usedto provide a high-level interface with the MicroTech controller. It can be connected tothe controller either directly or remotely via phone lines with an optional modem.

• The optional MicroTech Network Master Panel (NMP) allows multiple screw chillercontrollers to be incorporated into a building-wide network with other MicroTech unitand auxiliary controllers. In conjunction with a personal computer, it provides thebuilding operator with the capability to perform advanced equipment control andmonitoring from a central or remote location.

• Open Protocol is a commitment from McQuay International to provide a cost effectivemeans to building automation through a strategic and joint effort with majortemperature control companies. This optional feature provides an interface betweenMicroTech controllers and the building automation system. The result can be reducedinstallation costs, greater reliability and a seamless operator interface with allequipment in the building.


MicroTech Controller Utilizing Fuzzy LogicMcQuay International has combinedmicroprocessor power and versatilityand our extensive experience in chillerdesign to create the MicroTech screwchiller controller utilizing a fuzzy logiccontrol system. The MicroTech controlprovides low maintenance, highperformance and energy efficientoperation that is so vital to profitablebuilding operation in today's economicclimate.

Fuzzy Logic ControlTraditional control systems on today's chillers do not adequately provide precisiontemperature control of the system. McQuay International has implemented an advanceddigital control method based upon fuzzy logic that maintains tighter and more stable controlof the chiller system.

Conventional control logic operates on the true/false, black and white theory. However, inpractical applications everything is not black and white, but rather can be found somewherein between as shades of gray. Terms such as hot and cold in conventional controltechniques are replaced by ambiguous words like warm and cool. Fuzzy logic does notmaintain that a statement has to be true or false, but instead measures the degree of truthwithin the statement and begins to take action immediately. Unlike traditional controllersthat rely on a linear control theory, the fuzzy logic system is based upon approximatereasoning with a set of fuzzy rules. Fuzzy rules are "if-then" statements with varyingdegrees of precision.

A simple analogy of a "if-then" statement could be a car in traffic. If the distance betweentwo cars is adequate, then the car behind will continue at the same speed. If the distancebetween the two cars increases, then the car in the rear can accelerate slowly. If thedistance between the two cars is reduced slightly, then the car behind brakes slowly. If thedistance between them is reduced quickly, then the car in the rear must brake much morequickly. Fuzzy logic operates on this same principle.

The MicroTech controller supplied on the ALS chillers utilizes fuzzy logic in the control ofsuction line superheat and the positioning of the electronic expansion valve in response tosystem load. Expansion valve hunting, not uncommon on traditional thermostaticexpansion valves, has been eliminated. Optimized superheat is maintained under allconditions providing excellent control.

Proactive ControlThe MicroTech Control continuously monitors all important system parameters and willtake measures to avoid unit shutdown if a system imbalance or upset occurs. An alarmcircuit is energized under these circumstances.


Stand-alone Unit ControlsThe MicroTech unit controller is a microprocessor-based direct digital control systemdesigned to provide sophisticated monitoring and control. Designed with the systemoperator in mind, the MicroTech controller features an easy to use 12-key keypad and 32-character display that provides access to temperatures, pressures, set points, operatingstates, schedules and alarm messages in either English or Metric units. The controllerincludes password protection to guard against unauthorized or accidental set point orparameter changes.

The MicroTech unit controller can be used as a stand-alone controller, or it can beintegrated into a MicroTech network by using the Network Master Panel or the RemoteMonitoring and Sequencing Panel. Regardless of whether the controller is stand-alone orincluded in a network, an IBM-compatible computer containing MicroTech Monitorsoftware can be connected to give the operator full-screen unit monitoring and controlcapability.

Electronic Expansion ValveThe ALS air-cooled chiller is equipped with the mostadvanced means of refrigerant flow control available. Anelectronic expansion valve coupled with a MicroTech unitcontroller and fuzzy control logic provide excellentoperating efficiencies both at full and part load operation.

Unlike conventional thermal expansion valves whichrequire a large pressure drop across the valve and result inhigher condenser head pressure, the electronic valve doesnot need a large pressure drop across it to operateeffectively. During part load operation the electronicvalve allows the system to operate at lower condensingpressure, minimizes suction line superheat and providesfor a more stable system operation. Unit efficiencies aredramatically improved. The electronic expansion valve isan excellent choice of control for the ALS chiller line,providing precise control with a very fast response time.

Optional Remote Monitoring and Sequencing PanelThe MicroTech Remote Monitoring and Sequencing (RMS) panel provides monitoring ofremote chillers via a single twisted pair of wires. The RMS panel allows the user to accessinformation such as unit status, temperatures and pressures, all control set points, alarmconditions, time and date of alarm conditions, as well as the ability to clear alarms remotely.The RMS panel is equipped with a keypad/display that is identical to the chiller controller'skeypad/display. With a special keystroke combination, the RMS keypad/display can beinterfaced with any Microtech chiller controller. It then operates identically to the chiller-mounted keypad/display. Thus the operator has full access to all networked chillers from asingle remote location. Panel-mounted LEDs clearly indicate with which controller theRMS Panel keypad/display is currently interfaced.

Any chiller alarm or loss of communication alarm that occurs will be indicated by a panel-mounted alarm LED. An alarm will also cause the panel-mounted annunciator to sound.The volume can be adjusted with a small potentiometer. Any alarm in the network can becleared at the RMS panel keypad.


Optional Personal Computer Monitoring(Part Number 063430513) A personal computer equipped with MicroTech Monitorsoftware can be used to provide a high-level interface with the MicroTech controller. It canbe connected to the controller either directly or remotely via phone lines with an optionalmodem. If the controller is part of a MicroTech network personal computer, monitoring canbe done via network communications.

Optional Network Master Panel(Part Number 066003521) The MicroTech Network Master Panel (NMP) allows multiplescrew chiller controllers to be incorporated into a building-wide network with otherMicroTech unit and auxiliary controllers. In conjunction with a personal computer, itprovides the building operator with the capability to perform advanced equipment controland monitoring from a central or remote location. This is strictly for use in a McQuayControls building automation system.

Optional Open ProtocolOpen Protocol is a commitment from McQuay International to provide a cost effectivemeans to building automation through a strategic and joint effort with major temperaturecontrol companies. Open Protocol provides an interface between one or multipleMicroTech controllers and the building automation system. The result can be reducedinstallation costs, greater reliability and a seamless operator interface with all equipment inthe building. A nominal licensing fee per site is required (license Part Number 066532701).

Open Protocol Master (OPM)(Part Number 055104401) The MicroTech Open Protocol Master (OPM) panel is usuallyrequired to provide the temperature control company a single-point connection when two ormore MicroTech controllers are being networked with the temperature control company'ssystem.

MicroTech BACdrop GatewayThe McQuay BACdrop Gateway panel allows any BACnet based building automationsystem (BAS) to communicate with MicroTech controllers. The panel translates betweenthe standard BACnet protocol (ANSI/ASHRAE 135-1995) and the MicroTech protocol. Nomodifications to the MicroTech hardware or software are necessary. Since BACnet is astandard, public protocol no license agreement is necessary.

10 ALS 141C – 218C

Design Advantages

Ultra-low Sound LevelsThe issue of objectionable sound or "noise" can no longer be treated lightly asmanufacturers may have done in the past. To an owner, sound levels can be as important asunit efficiency and must be addressed prior to the start of any development program.Concentrated efforts to design the quietest air-cooled chiller in the market has paid off withthe ALS chiller line. Unique compressor and system design allow the ALS air-cooledchiller to produce sound levels considerably lower than competitive reciprocating and twin-screw compressor units in the market today.

The gaterotor material is manufactured from an advanced engineered composite, and thedifference in material density and coefficient of elasticity from the main screw rotorreduces noise levels through the compression chamber. The discharge housing is designedas a "tuned sound attenuator" to cancel out any noise pulsation. Also, the rotor injectionattenuates sound levels within the compressor.

Balanced Forces on CompressorThe single-screw compressor has a well-balanced compression mechanism that cancels thescrew rotor load in both the radial and axial directions. Inherent to the basic single-screwcompressor design is the virtually load free operation that gives main bearings a design life3-4 times greater than twin-screws, and eliminates expensive and complicated thrustbalancing schemes. The two exactly opposed gaterotors create two exactly opposedcompression cycles. Compression is made at the lower and upper parts of the screw rotor atthe same time, thus canceling the radial loads. Also, both ends of the screw rotor aresubjected to suction pressure only, which cancels the axial loads and eliminates the hugethrust loads inherent in twin-screw compressors.

Figure 2, Balanced Forces

Reliable Bearing DesignSince the main rotor shaft and gaterotor shcompressor, sufficient space to locate each characteristic for the single-screw compresscompared to twin-screws.

Product Manual ALS-5

afts cross at right angles in the single-screwbearing is obtained. Because of this uniqueor, bearing life can be designed much higher

Screw

GaterotorGaterotor


Tolerant of Liquid ReturnTolerance to liquid return is provided by the heavy construction of the screw componentsand by McQuay's Compliant Gate feature. If any liquid starts to enter the main rotor, thebuild up of pressure immediately causes the gate rotor to raise off the main rotor againstspring pressure. This relieves the refrigerant pressure and the refrigerant is pumped out.When the refrigerant has been discharged, the spring returns the gaterotor to its normalposition. This increases system reliability because it permits normal operation underabnormal conditions that would be catastrophic (liquid return) for many other compressordesigns.

Economizer DesignThe ALS screwcompressor uses anintegral economizerwhere centrifugal forceis utilized to separatethe flash gas from theliquid refrigerant priorto it entering theevaporator. A smallcentrifugal liquid/vaporseparator mounted onthe rear of thecompressor/motor shaftachieves the separation.The economizer itself islocated within theenvelope of themotor/compressorhousing.

Low Vibration LevelsThe extremely low vibration levels, inherent with the single-screw design, will not passthrough system piping and allow objectionable resonated sound to be carried into thebuilding.

Because the moving components in the McQuay ALS screw compressor are purelyrotational, the dynamic forces and vibration created by the system are very low. Thisreduced vibration results in less movement to refrigerant lines and other parts of the system.The vibration limit on the test stand is 0.14 in/sec (3.56 mm/sec) and compressors test farbelow this limit.

Liquid Refrigerant-Cooled MotorThe compressor motor for the ALS screw chiller is liquid-refrigerant cooled. The liquidrefrigerant allows the motor to operate at lower temperatures and enhances systemreliability and motor life when compared to suction gas-cooled designs found on twin-screwor competitor's reciprocating compressors.

Wide Application RangeThe capability to handle wide application ranges makes the ALS screw chiller a superiorchoice for comfort cooling, ice storage, and process applications. McQuay Internationalhas been a proven leader in chiller applications and once again has developed a line ofchillers unsurpassed in performance and quality.


Selection Procedures60 Hz - I-P UnitsThe Performance Data on the following pages are based on a 10 degree F (5.5 degree C)delta-T through the evaporator (2.4 gpm/ton). Adjustment factors for other delta-Ts can befound in Table 3. The minimum leaving chilled water temperature without glycol is 40.0°F(4.4°C). For brine selections refer to Table 1 and Table 2 for ethylene or propylene glycoladjustment factors. Ratings are based on a 0.0001 ft2 x hr x °F/BTU (0.0176 m2 x °C/kW)fouling factor in the evaporator and sea level operation. For other fouling factors orelevations refer to Table 3.

For applications outside the catalog ratings contact your local McQuay sales representative.

Selection ExampleGiven: 120 tons

95°F ambient air temperature, 4,000 feet elevation

288 gpm, 54°F to 44°F, 0.0001 evaporator fouling factor

1. Use the following formula (for water only) to calculate any missing elements:

(gpm x delta-T) /24 = tons

2. From Performance Data R-22, IP Units Table 4, an ALS 141C at the given conditionswill produce 124.5 tons with a compressor kW input of 140.8 and a unit EER of 9.6.Correct for elevation from Table 3:

Capacity: 124.5 tons x 0.973 = 121.1 tons

Power: 140.8 kW x 1.021 = 143.8 kW

EER = Output / Input = 9.6 x 0.973 / 1.021 = 9.1

3. Determine the evaporator pressure drop. Using Figure 3, enter at 288 gpm and followup to the ALS 141C line intersect. Read horizontally to obtain an evaporator pressuredrop of 8.9 ft.

Selection example utilizing ethylene glycolGiven:

150 tons, 95°F ambient temperature

56°F to 44°F chilled fluid temperature

0.0001 evaporator fouling factor.

Protect against freezing to 0°F

1. From Table 1 select an ethylene glycol concentration of 40% to protect to 0°F.

2. Adjustment factors at 40% glycol:

Capacity = 0.961, Power = 0.976, Flow = 1.121, Pressure Drop = 1.263.

3. Adjustment Factor for 12 degree chilled water range from Table 3 is 1.005 Capacity,1.002 Power.


4. Select an ALS 171C with a capacity of 155.8 tons and correct with 40% ethylene glycolfactors.

Correct capacity: 0.961 x 1.005 x 155.8 tons = 150.5 tons.

Correct compressor power: 0.976 x 1.002 x 176.9 kW = 173.0 kW

5. Correct chilled fluid flow:

Fluid flow (water) at 150 tons

gpm (water) = (tons x 24) / delta-T

gpm = (150 tons x 24) / 12 degrees = 300 gpm

Fluid flow (40% EG solution):

300 gpm (water) x 1.121 flow correction factor = 336 gpm (ethylene glycol)

6. Determine the evaporator pressure drop. Using Figure 3, enter at 300 gpm (water) andfollow to the ALS 171C line intersect. Read horizontally to obtain an evaporatorpressure drop of 8.4 ft.

7. Correct the pressure drop for 40% EG solution:

8.4 ft x 1.263 pressure drop correction factor = 10.6 ft for ethylene glycol.

Performance Adjustment Factors

Ethylene and Propylene Glycol FactorsALS chiller units are designed to operate with leaving chilled fluid temperatures of 20.0°Fto 60.0°F (-6.7°C to 15.5°C). Leaving chilled fluid temperatures below 40°F (4.4°C) resultin evaporating temperatures at or below the freezing point of water and a glycol solution isrequired. McQuay also recommends double insulation, and the system designer shoulddetermine its necessity. The use of glycol will reduce the performance of the unitdepending on its concentration. This should be taken into consideration during initialsystem design. On glycol applications the supplier normally recommends that a minimumof 25% solution by weight be used for protection against corrosion.

Altitude Correction FactorsPerformance tables are based on sea level altitude. At elevations higher than sea level, theperformance of the unit will be decreased due to the lower air density. For performance atelevations other than sea level refer to Table 3.

Evaporator Temperature Drop FactorsPerformance tables are based on a 10 degree F (5.6 degree C) temperature drop through theevaporator. Other delta-Ts will require adjustment factors found in Table 3. Temperaturedrops outside a 6 to 16 degree F (3.3 to 8.9 degree C) range may adversely affect thesystem's capability to maintain acceptable control and are not recommended.

The maximum water temperature that can be circulated through the evaporator in a non-operating mode is 100°F (37.8°C). High temperatures can result in poor performance anddamage to the equipment.


Fouling FactorPerformance tables are based on water with a fouling factor of 0.0001 ft2 x hr x °F/BTU(0.0176 m2 x °C/kW) per ARI 550/590-98. As fouling is increased, performance decreases.For performance at other fouling factors refer to Table 3.

Foreign matter in the chilled water system will adversely affect the heat transfer capabilityof the evaporator and could increase the pressure drop and reduce the water flow. Foroptimum unit operation, proper water treatment and filtration must be maintained.

Table 1, Ethylene GlycolFreeze Point%

E.G. °F °C Capacity Power Flow PD

10 26 -3 0.991 0.996 1.013 1.07020 18 -8 0.982 0.992 1.040 1.12930 7 -14 0.972 0.986 1.074 1.18140 -7 -22 0.961 0.976 1.121 1.26350 -28 -33 0.946 0.966 1.178 1.308

Table 2, Propylene GlycolFreeze Point%

P.G. °°°°F °C Capacity Power Flow PD

10 26 -3 0.987 0.992 1.010 1.06820 19 -7 0.975 0.985 1.028 1.14730 9 -13 0.962 0.978 1.050 1.24840 -5 -21 0.946 0.971 1.078 1.36650 -27 -33 0.929 0.965 1.116 1.481

Units operating with glycol are not included in the ARI Certification Program

Table 3, Correction FactorsChilled Water Fouling Factor

Delta-T 0.0001 (0.0176) 0.00025 (0.044) 0.00075 (0.132) 0.00175 (0.308)ALTITUDE

°F °C Cap. Power Cap. Power Cap. Power Cap. Power

6 3.3 0.992 0.995 0.985 0.993 0.962 0.986 0.919 0.9728 4.4 0.995 0.997 0.988 0.995 0.965 0.988 0.922 0.97410 5.6 1.000 1.000 0.993 0.998 0.970 0.991 0.927 0.97712 6.7 1.005 1.002 0.998 1.000 0.975 0.993 0.932 0.97914 6.8 1.010 1.005 1.003 1.003 0.980 0.996 0.936 0.982

SEALEVEL

16 8.9 1.014 1.007 1.007 1.005 0.984 0.998 0.940 0.984

6 3.3 0.978 1.005 0.971 1.003 0.949 0.996 0.906 0.9828 4.4 0.982 1.007 0.975 1.005 0.953 0.998 0.910 0.98410 5.6 0.986 1.009 0.979 1.007 0.956 1.000 0.914 0.98612 6.7 0.992 1.011 0.985 1.009 0.962 1.002 0.919 0.98814 6.8 0.997 1.014 0.990 1.012 0.967 1.005 0.924 0.991

2000 feet(610 m)

16 8.9 1.000 1.016 0.993 1.014 0.970 1.007 0.927 0.993

6 3.3 0.966 1.016 0.959 1.014 0.937 1.007 0.895 0.9938 4.4 0.969 1.018 0.962 1.016 0.940 1.009 0.898 0.99510 5.6 0.973 1.021 0.966 1.019 0.944 1.012 0.902 0.99812 6.7 0.978 1.025 0.971 1.023 0.949 1.016 0.906 1.00214 6.8 0.982 1.027 0.975 1.025 0.953 1.018 0.910 1.004

4000 feet(1220 m)

16 8.9 0.986 1.028 0.979 1.026 0.956 1.019 0.914 1.005

6 3.3 0.953 1.025 0.946 1.023 0.924 1.016 0.883 1.0028 4.4 0.955 1.028 0.948 1.026 0.926 1.019 0.885 1.00510 5.6 0.959 1.031 0.952 1.029 0.930 1.022 0.889 1.00812 6.7 0.963 1.034 0.956 1.032 0.934 1.024 0.893 1.01114 6.8 0.968 1.036 0.961 1.034 0.939 1.026 0.897 1.013

6000 feet(1830 m)

16 8.9 0.972 1.037 0.965 1.035 0.943 1.027 0.901 1.014


Performance DataR-22, IP UnitsTable 4, ALS 141C – ALS 218C

AMBIENT AIR TEMPERATUREALS LWT 75°F 85°F 95°F 105°F 115°FSIZE (°F) Cap. PWR Cap. PWR Cap. PWR Cap. PWR Cap. PWR

Tons kWi EER Tons kWi EER Tons kWi EER Tons kWi EER Tons kWi EER

40.0 128.3 111.3 12.1 123.0 124.9 10.4 117.7 138.6 9.1 112.2 156.9 7.8 105.5 177.2 6.542.0 131.7 112.1 12.3 126.3 125.8 10.8 120.9 139.6 9.3 115.5 158.0 7.9 108.4 178.2 6.744.0 135.0 112.6 12.7 129.7 126.8 10.9 124.5 140.8 9.6 119.1 159.2 8.1 111.6 178.7 6.946.0 138.4 113.5 12.9 133.2 127.6 11.2 128.0 141.7 9.8 122.4 160.6 8.3 114.7 180.0 7.148.0 141.8 114.2 13.1 136.7 128.5 11.4 131.6 142.9 10.0 125.9 162.0 8.4 118.0 181.2 7.2

141C

50.0 144.7 115.1 13.3 140.0 129.8 11.6 135.2 144.6 10.2 129.4 163.6 8.6 121.6 182.3 7.440.0 143.9 126.1 12.1 137.9 141.5 10.5 132.1 156.9 9.1 126.0 177.8 7.8 118.4 200.8 6.542.0 147.7 126.9 12.3 141.8 142.4 10.8 135.7 158.1 9.3 129.5 179.0 7.9 121.6 201.7 6.744.0 151.5 127.6 12.7 145.5 143.5 11.0 139.7 159.4 9.6 133.7 180.3 8.1 125.3 202.4 6.946.0 155.3 128.5 12.9 149.5 144.5 11.2 143.7 160.6 9.8 137.3 181.8 8.3 128.7 203.8 7.148.0 159.1 129.3 13.3 153.3 145.6 11.4 147.5 161.9 10.0 141.3 183.5 8.4 132.4 205.1 7.2

150C

50.0 162.4 130.2 13.4 157.1 147.0 11.6 151.7 163.7 10.2 145.2 185.3 8.6 136.4 206.5 7.440.0 160.6 139.9 12.1 154.0 157.0 10.4 147.3 174.1 9.2 140.6 197.2 7.8 132.1 222.7 6.542.0 164.9 140.8 12.3 158.2 158.1 10.8 151.4 175.4 9.4 144.5 198.6 7.9 135.7 223.9 6.744.0 169.0 141.5 12.7 162.4 159.3 11.0 155.8 176.9 9.6 149.2 200.1 8.1 139.8 224.6 6.946.0 173.3 142.6 12.9 166.8 160.4 11.2 160.3 178.1 9.8 153.2 201.8 8.3 143.6 226.2 7.148.0 177.5 143.5 13.2 171.1 161.6 11.4 164.7 179.7 10.0 157.7 203.6 8.4 147.8 227.6 7.2

171C

50.0 181.2 144.6 13.3 175.3 163.1 11.6 169.2 181.7 10.2 162.1 205.6 8.6 152.3 229.0 7.340.0 175.2 154.3 12.1 168.0 173.1 10.4 160.7 191.9 9.1 153.3 217.4 7.8 144.1 245.5 6.542.0 179.8 155.2 12.3 172.5 174.3 10.8 165.2 193.4 9.3 157.7 218.9 7.9 148.1 246.8 6.744.0 184.4 156.0 12.7 177.2 175.6 10.9 170.0 195.0 9.6 162.7 220.6 8.1 152.5 247.5 6.946.0 189.0 157.2 12.9 182.0 176.8 11.2 174.9 196.4 9.8 167.1 222.4 8.3 156.7 249.3 7.148.0 193.7 158.2 13.1 186.7 178.1 11.4 179.6 198.0 10.0 171.9 224.5 8.4 161.2 250.9 7.2

186C

50.0 197.7 159.3 13.3 191.2 179.8 11.6 184.6 200.3 10.2 176.8 226.6 8.6 166.1 252.6 7.440.0 178.3 151.0 12.4 170.9 169.5 10.7 163.6 188.0 9.4 156.1 212.9 8.0 146.6 240.5 6.642.0 183.0 152.0 12.6 175.7 170.6 11.0 168.1 189.3 9.6 160.5 214.4 8.1 150.7 241.7 6.844.0 187.6 152.8 13.0 180.3 172.0 11.2 173.1 191.0 9.8 165.6 216.0 8.3 155.2 242.5 7.046.0 192.5 153.9 13.2 185.2 173.1 11.4 178.0 192.3 10.0 170.1 217.9 8.5 159.5 244.2 7.248.0 197.1 154.9 13.4 190.1 174.4 11.6 182.9 193.9 10.2 175.1 219.8 8.5 164.0 245.7 7.3

190C

50.0 201.3 156.0 13.5 194.6 176.1 11.8 187.9 196.1 10.4 179.9 221.9 8.7 169.1 247.4 7.540.0 189.9 163.8 12.3 182.0 183.8 10.6 174.2 203.8 9.3 166.2 230.8 7.9 156.1 260.7 6.642.0 194.8 164.8 12.5 186.9 185.0 10.9 178.9 205.3 9.5 170.8 232.4 8.0 160.4 262.0 6.844.0 199.8 165.7 12.8 191.9 186.5 11.1 184.2 207.1 9.7 176.3 234.2 8.2 165.3 262.9 6.946.0 204.8 166.9 13.0 197.0 187.7 11.3 189.4 208.6 9.9 181.0 236.2 8.4 169.7 264.7 7.148.0 209.8 168.0 13.3 202.2 189.1 11.5 194.6 210.2 10.1 186.3 238.3 8.5 174.6 266.4 7.2

200C

50.0 214.2 169.2 13.4 207.2 190.9 11.7 200.1 212.6 10.3 191.6 240.6 8.7 179.9 268.2 7.440.0 196.0 169.7 12.3 187.9 190.4 10.6 179.9 211.2 9.3 171.6 239.3 7.9 161.2 270.1 6.642.0 201.2 170.8 12.5 193.1 191.7 10.9 184.8 212.7 9.5 176.5 240.9 8.0 165.7 271.5 6.844.0 206.3 171.6 12.8 198.3 193.2 11.1 190.3 214.6 9.7 182.1 242.7 8.2 170.6 272.4 6.946.0 211.6 172.9 13.0 203.6 194.5 11.3 195.7 216.1 9.9 187.0 244.8 8.4 175.3 274.3 7.148.0 216.7 174.1 13.3 208.9 196.0 11.5 201.1 217.9 10.1 192.5 247.0 8.5 180.3 276.1 7.2

206C

50.0 221.2 175.3 13.4 213.9 197.9 11.7 206.7 220.4 10.3 197.8 249.3 8.7 185.9 277.9 7.440.0 210.7 176.0 12.4 202.0 197.5 10.7 193.3 219.1 9.4 184.4 248.2 8.0 173.3 280.2 6.642.0 216.2 177.2 12.6 207.5 198.9 11.0 198.6 220.7 9.6 189.6 249.8 8.1 178.0 281.7 6.844.0 221.7 178.1 13.0 213.0 200.4 11.2 204.4 222.6 9.8 195.6 251.7 8.3 183.4 282.6 7.046.0 227.3 179.4 13.2 218.7 201.8 11.4 210.3 224.2 10.0 201.0 253.9 8.5 188.3 284.6 7.248.0 232.9 180.6 13.4 224.5 203.3 11.6 216.1 226.1 10.2 206.8 256.2 8.5 193.8 286.4 7.3

218C

50.0 237.7 181.9 13.5 229.8 205.3 11.8 222.0 228.6 10.4 212.6 258.6 8.7 199.8 288.3 7.5NOTES:1. Rated in accordance with ARI Standard 550/590. Shaded and bold ratings are certified in accordance with the ARI Water-Chilling Packages Using the Vapor

Compression Cycle Certification Program, which is based on ARI Standard 550/590.2. Units with remote evaporators are not included in the ARI Certification Program.3. Ratings based on HCFC-22, evaporator fouling factor of 0.0001, 10 degree delta-T, evaporator flow of 2.4 gpm/ton and sea level altitude.4. For units with SpeedTrol option multiply capacity and EER by 0.99. For units operating at 208 volt, multiply capacity by 0.98.5. Interpolation is allowed, extrapolation is not permitted. Consult McQuay for performance outside the cataloged ratings.6. kW input is for compressors only. EER is for the entire unit, including compressors, fan motors and control power. Total power to the unit can be calculated

by: kW = tons x 12 / EER7. Compressor loading and unloading is adaptively determined by system load, ambient air temperature, and other inputs to the MicroTech control algorithms.


R-22, SI UnitsTable 5, ALS 141C - ALS 218C

AMBIENT AIR TEMPERATUREALS LWT 30°C (86°F) 35°C (95°F) 40°C (104°F) 45°C (113°F) 50°C (122°F)SIZE °C (°F) Cap. PWR Cap. PWR Cap. PWR Cap. PWR Cap. PWR

kW kWi COP kW kWi COP kW kWi COP kW kWi COP kW kWi COP

5.0 (41.0) 436.4 126.7 3.1 419.6 139.1 2.7 402.3 155.6 2.3 380.9 173.7 2.0 358.9 191.9 1.76.0 (42.8) 447.1 127.6 3.1 430.3 140.1 2.8 413.1 156.6 2.4 390.8 174.4 2.1 367.9 192.3 1.77.0 (44.6) 458.1 128.4 3.2 441.5 141.1 2.8 424.2 157.7 2.4 401.1 175.2 2.1 377.2 192.7 1.88.0 (46.4) 469.0 129.2 3.3 452.7 142.0 2.9 434.8 159.0 2.5 411.0 176.3 2.2 386.6 193.7 1.89.0 (48.2) 480.2 130.1 3.3 464.0 143.1 2.9 446.0 160.3 2.5 421.8 177.5 2.2 396.9 194.6 1.9

141C

10.0 (50.0) 490.5 131.3 3.4 475.5 144.6 3.0 457.2 161.7 2.6 433.3 178.6 2.2 408.6 195.4 1.95.0 (41.0) 489.8 143.5 3.1 470.9 157.5 2.7 451.5 176.3 2.3 427.5 196.7 2.0 403.0 217.2 1.76.0 (42.8) 501.8 144.4 3.1 482.8 158.6 2.8 463.5 177.4 2.4 438.6 197.5 2.1 413.0 217.8 1.77.0 (44.6) 513.9 145.4 3.2 495.4 159.7 2.8 476.1 178.6 2.4 450.2 198.4 2.1 423.4 218.3 1.88.0 (46.4) 526.3 146.3 3.3 508.1 160.8 2.9 488.0 180.0 2.5 461.4 199.7 2.2 433.9 219.4 1.89.0 (48.2) 538.5 147.4 3.3 520.4 162.1 2.9 500.4 181.5 2.5 473.2 200.9 2.2 445.0 220.3 1.9

150C

10.0 (50.0) 550.5 148.6 3.4 533.5 163.7 3.0 513.0 183.1 2.6 485.9 202.2 2.2 458.1 221.3 1.95.0 (41.0) 546.6 159.3 3.1 525.3 174.8 2.7 503.7 195.6 2.4 476.9 218.2 2.0 449.6 241.0 1.76.0 (42.8) 559.9 160.3 3.1 538.7 176.0 2.8 517.2 196.9 2.4 489.3 219.2 2.1 460.7 241.6 1.77.0 (44.6) 573.5 161.4 3.2 552.8 177.3 2.8 531.3 198.3 2.4 502.2 220.2 2.1 472.2 242.2 1.88.0 (46.4) 587.3 162.4 3.2 566.8 178.4 2.9 544.4 199.8 2.5 514.7 221.6 2.2 484.1 243.5 1.89.0 (48.2) 601.0 163.6 3.3 580.7 179.9 2.9 558.5 201.4 2.5 528.2 222.9 2.2 496.8 244.5 1.9

171C

10.0 (50.0) 614.3 164.9 3.4 595.1 181.7 3.0 572.6 203.2 2.6 542.5 224.4 2.2 511.5 245.5 1.95.0 (41.0) 596.2 175.6 3.1 573.0 192.6 2.7 549.5 215.6 2.3 520.4 240.5 2.0 490.6 265.7 1.76.0 (42.8) 610.8 176.7 3.1 587.7 194.0 2.8 564.2 217.0 2.4 533.9 241.6 2.1 502.7 266.3 1.77.0 (44.6) 625.7 177.9 3.2 603.0 195.5 2.8 579.5 218.5 2.4 548.0 242.7 2.1 515.4 266.9 1.88.0 (46.4) 640.8 179.0 3.3 618.3 196.7 2.9 593.7 220.2 2.5 561.5 244.3 2.2 528.3 268.4 1.89.0 (48.2) 655.7 180.3 3.3 633.5 198.2 2.9 609.1 222.1 2.5 576.2 245.8 2.2 542.2 269.5 1.9

186C

10.0 (50.0) 670.0 181.8 3.4 649.2 200.3 3.0 624.5 223.9 2.6 591.6 247.4 2.2 557.6 270.8 1.95.0 (41.0) 606.9 172.0 3.1 583.3 188.7 2.8 559.3 211.2 2.4 529.6 235.6 2.0 499.1 260.3 1.76.0 (42.8) 621.8 173.1 3.2 598.1 190.0 2.8 574.2 212.6 2.4 543.4 236.6 2.1 511.7 260.9 1.77.0 (44.6) 636.8 174.3 3.3 613.8 191.4 2.9 589.7 214.1 2.5 557.8 237.7 2.2 524.8 261.5 1.88.0 (46.4) 652.2 175.3 3.3 629.4 192.7 2.9 604.5 215.7 2.5 571.6 239.2 2.2 537.7 262.8 1.99.0 (48.2) 667.5 176.5 3.4 644.9 194.1 3.0 620.2 217.4 2.6 586.4 240.7 2.2 551.6 263.9 1.9

190C

10.0 (50.0) 682.0 178.1 3.4 660.9 196.1 3.0 635.6 219.3 2.6 602.3 242.3 2.3 568.1 265.2 2.05.0 (41.0) 645.9 186.4 3.1 620.9 204.5 2.7 595.4 228.9 2.4 563.7 255.4 2.0 531.2 282.1 1.76.0 (42.8) 661.6 187.6 3.2 636.6 206.0 2.8 611.3 230.4 2.4 578.4 256.5 2.1 544.7 282.8 1.87.0 (44.6) 677.5 188.9 3.2 653.3 207.5 2.8 627.8 232.1 2.5 593.7 257.7 2.1 558.5 283.4 1.88.0 (46.4) 693.9 190.0 3.3 669.9 208.9 2.9 643.4 233.9 2.5 608.3 259.3 2.2 572.2 284.9 1.89.0 (48.2) 710.2 191.4 3.3 686.3 210.5 3.0 660.0 235.7 2.6 624.1 260.9 2.2 586.9 286.1 1.9

200C

10.0 (50.0) 726.0 193.1 3.4 703.6 212.6 3.0 676.7 237.8 2.6 641.0 262.6 2.3 604.1 287.4 1.95.0 (41.0) 667.1 193.2 3.1 641.3 212.0 2.7 615.1 237.3 2.4 582.3 264.7 2.0 548.6 292.4 1.76.0 (42.8) 683.4 194.4 3.2 657.6 213.5 2.8 631.4 238.8 2.4 597.4 265.8 2.1 562.3 293.1 1.87.0 (44.6) 700.1 195.8 3.2 674.9 215.1 2.8 648.4 240.5 2.5 613.1 267.1 2.1 576.6 293.8 1.88.0 (46.4) 717.0 197.0 3.3 692.1 216.5 2.9 664.6 242.3 2.5 628.3 268.8 2.2 590.9 295.3 1.89.0 (48.2) 733.6 198.4 3.3 709.1 218.2 3.0 681.8 244.3 2.6 644.7 270.5 2.2 606.3 296.7 1.9

206C

10.0 (50.0) 749.8 200.2 3.4 726.7 220.4 3.0 698.9 246.5 2.6 662.2 272.2 2.3 624.4 297.9 1.95.0 (41.0) 716.9 200.4 3.1 689.0 219.9 2.8 660.8 246.1 2.4 625.7 274.6 2.0 589.6 303.3 1.76.0 (42.8) 734.3 201.7 3.2 706.5 221.4 2.8 678.5 247.7 2.4 641.9 275.8 2.1 604.3 304.1 1.77.0 (44.6) 752.1 203.0 3.3 725.1 223.1 2.9 696.8 249.5 2.5 658.8 277.0 2.2 619.7 304.7 1.88.0 (46.4) 770.2 204.3 3.3 743.6 224.6 2.9 714.1 251.4 2.5 675.1 278.8 2.2 634.9 306.3 1.99.0 (48.2) 788.3 205.8 3.4 761.9 226.3 3.0 732.4 253.4 2.6 692.8 280.5 2.2 651.8 307.6 1.9

218C

10.0 (50.0) 805.5 207.6 3.4 780.8 228.6 3.0 751.1 255.6 2.6 711.6 282.3 2.3 670.9 309.0 2.0NOTES:1. Rated in accordance with ARI Standard 550/590.2. Units with remote evaporators are not included in the ARI Certification Program.3. Ratings based on HCFC-22, evaporator fouling factor of 0.0176, 5.8°C degree delta-T, and sea level altitude.4. For units with SpeedTrol option multiply capacity and COP by 0.99.5. For units operating at 208 volt, multiply capacity by 0.98.6. Interpolation is allowed, extrapolation is not permitted. Consult McQuay for performance outside the cataloged ratings.7. kW input is for compressors only. COP is for the entire unit, including compressors, fan motors and control power. Total power to the unit can be

calculated by: kW = kW(output) / COP.8. Ratings are valid for operation on 3 phase, 60 Hz, and 208//230/380/460/575 volts.9. Compressor loading and unloading is adaptively determined by system load, ambient air temperature, and other inputs to the MicroTech control

algorithms.


Part load Performance

Table 6, ALS 141C – ALS 218C, R-22UnitSize % Load Capacity

TonsPower

Unit kW EER IPLV

100.00 124.5 157.9 9.675.00 93.4 101.2 11.250.00 62.2 59.4 12.7141C

25.00 31.2 25.8 14.6

12.3

100.00 139.7 176.7 9.675.00 104.7 113.3 11.250.00 69.8 66.5 12.7150C

25.00 34.9 28.9 14.7

12.3

100.00 155.8 195.6 9.675.00 116.9 125.4 11.250.00 77.9 73.5 12.7171C

25.00 39.0 31.9 14.6

12.4

100.00 170.0 215.7 9.675.00 127.5 138.3 11.250.00 85.0 81.1 12.7186C

25.00 42.5 35.2 14.6

12.3

100.00 173.1 212.7 9.875.00 129.8 136.3 11.450.00 86.5 80.0 13.0190C

25.00 43.3 34.7 14.9

12.5

100.00 184.2 228.8 9.775.00 138.1 146.7 11.350.00 92.1 86.0 12.8200C

25.00 46.0 37.4 14.7

12.4

100.00 190.3 236.3 9.775.00 142.7 151.4 11.350.00 95.1 88.9 12.8206C

25.00 47.6 38.6 14.7

12.4

100.00 204.4 251.2 9.875.00 153.3 161.1 11.450.00 102.2 94.4 13.0218C

25.00 51.1 41.1 14.9

12.5

NOTES:1. Certified in accordance with the ARI Water-Chilling Packages Using the Vapor Compression Cycle

Certification Program, which is based on ARI Standard 550/590.2. Units with remote evaporators are not included in the ARI Certification Program.3. Compressor unloading is adaptively determined by system load, ambient air temperature, and other

inputs to the MicroTech control algorithms.


Pressure DropFigure 3, Evaporator Pressure Drop, ALS 141C - ALS 218C

ALS 141

ALS 206

ALS 150-200

ALS 218

Minimum/Maximum Flow RatesALSUnitSize

MinimumFlow gpm

PressureDrop ft.

NominalFlow gpm

PressureDrop ft.

MaximumFlow gpm

PressureDrop ft.

141 187 4.0 298.8 9.5 498 24.2150 209 4.2 335.3 10.5 559 28.5171 234 5.2 373.9 13.0 623 35.3186 255 6.1 408.0 15.4 680 41.9190 260 6.4 415.4 16.0 692 43.4200 276 7.2 442.1 18.0 737 49.0206 285 7.5 456.7 18.7 761 50.4218 307 5.0 490.6 13.1 818 36.8


Sound DataSound levels can be as important as unit cost and efficiency, and must be addressed beforethe start of any project design. Efforts by McQuay design engineers to design chillers thatare sensitive to the sound requirements of the market, combined with McQuay’s inherentlyquiet rotary screw compressors, have paid off.

StandardsARI has established standards to provide uniform methods for the determination of thesound levels of equipment. For large air-cooled chillers it is ARI Standard 370, SoundRatings of Large Outdoor Refrigeration and Air-Conditioning Equipment.

Background InformationSound is a vibration in an elastic medium and is essentially a pressure and particledisplacement phenomena. A vibrating body produces compression waves and as the wavesare emitted from the vibrating body, molecules are ultimately compressed. These values aretransmitted through gases, liquids or solids-anything that is elastic or viscous.

The sound data provided in this section is presented with both sound pressure and soundpower levels. Sound power is the total sound energy radiated by a source per unit of timeintegrated over the surface through which the sound is radiated. Sound power is acalculated quantity and cannot be measured directly like sound pressure. Sound power isnot dependent on the surrounding environment or distance from the source.

Sound pressure varies with the distance from the source and is dependent on itssurroundings. For example, a brick wall located 10 feet from a unit (two reflectingsurfaces, the roof and the wall) will affect the sound pressure measurements differently thana unit mounted on a roof with only one reflecting surface (the roof). Sound pressure ismeasured in decibels (dB), which is a dimensionless ratio (on a logarithmic scale) betweenmeasured sound pressure and a reference sound pressure level.

Sound Pressure Levels - Full LoadAll sound pressure tables give the overall "A" weighted sound pressure levels which areconsidered typical of what may be measured in a hemispherical field with a hand heldsound meter in the absence of any nearby reflective surfaces other than the ground itself.The sound pressure levels in Table 7 are measured at 30 feet from the side of the unit, at100% unit load, no reflecting walls (Q=2), and ARI conditions; 95°F (35°C) ambient airtemperature and 54/44°F (12/7°C) chilled water temperatures.

Sound Power LevelsAcoustical consultants may require sound power octave band data to perform a detailedacoustical analysis. Sound measurements are taken over a prescribed area around the unitand the data is mathematically calculated to give the sound power in dB.

Table 7, Sound Pressure Octave Band Data, 60 HzUnit Octave Band & Center Frequency, Hz. Overall

Model 63 125 250 500 1000 2000 4000 8000 A-Weighted141 66 69 68 67 65 64 54 47 69150 66 69 68 68 65 64 54 47 70171 67 70 68 68 66 64 55 48 71186 68 71 69 67 67 64 56 49 72190 68 72 69 68 68 65 57 50 72200 70 73 70 69 69 66 58 51 73206 70 73 70 69 69 66 58 51 73218 71 74 71 70 70 67 59 52 74

Note: Data at:r=30 ft., .sound pressure at 30 feet (9.1 meters) from unitQ=2, unit on a flat roof or ground with no adjacent wall(s).


Table 8, Sound Power Octave Band Data, 60 HzUnit Octave Band & Center Frequency, Hz. Overall

Model 63 125 250 500 1000 2000 4000 8000 A-Weighted141 93 96 95 94 92 91 81 74 96150 93 96 95 95 92 91 81 74 97171 94 97 95 95 93 91 82 75 98186 95 98 96 94 94 91 83 76 99190 95 99 96 95 95 92 84 77 99200 97 100 97 96 96 93 85 78 100206 97 100 97 96 96 93 85 78 100218 98 101 98 97 97 94 86 79 101

Note: Sound power octave band data, dB per ARI Standard 370.

Sound Reduction Due to Distance from a UnitThe distance between a source of sound and the location of the sound measurementplays an important role in minimizing sound problems. The equation below can be usedto calculate the sound pressure level at any distance if the sound power is known.Results for typical distances are tabulated in Table 9. Another way of determining theeffect of distance is to work from sound pressure only. “Q”, the directionality factor, isa dimensionless number that compensates for the type of sound reflection from thesource. For example, a unit sitting on a flat roof or ground with no other reflectivesurfaces or attenuation due to grass, snow, etc., between source and receiver: Q=2.

Figure 4, "Q" Definition, Plan View, Unit Located in Center

Uniform Spherical RadiationQ=1 no reflecting surface

Uniform Hemispherical RadiationQ=2 single reflecting surface

Uniform Radiation over ¼ of sphereQ=4 two reflecting surfaces

Sound pressure can be calculated at any distance from the unit if the sound power isknown.

Lp=Lw-(20 log r) + (10 log Q) - .5

Lp = sound pressure r = distance from unit in feet

Lw = sound power Q = directionality factor

With Q=1, Unit suspended in space (theoretical condition), the equation simplifies to:

Lp = Lw – (20)(log r) –0.5

With Q=2, for a unit sitting on a flat roof or ground with no adjacent vertical wall as areflective surface, the equation simplifies to:

Lp = Lw – (20)(log r) + 2.5

With Q=4 for a unit sitting on a flat roof or ground with one adjacent vertical wall as areflective surface, the equation simplifies to:

Lp = Lw – (20)(log r) + 5.5

The equations are reduced to table form in Table 9 for various distances and the twomost usual cases of “Q” type of location.


Table 9, dB Conversion of Sound Power to Pressure for DistanceDB Reduction from Sound Power at the Source to

Sound Pressure at Referenced DistanceDistance from Sound

Sourceft. (m) Q=2 Q=430 (9) 27.1 24.0

50 (15) 31.6 28.575 (23) 35.1 32.0100 (30) 37.6 34.5150 (46) 41.1 38.0200 (61) 43.6 40.5300 (91) 47.6 44.0

Figure 5 gives the reduction in sound pressure due to distance.

Figure 5, Sound Pressure Attenuation Due to Distance from Unit

Air-Cooled Unit Orientation to Minimize SoundThe ALS chiller’s sound is directional in nature allowing the contractor/engineer to positionthe unit to minimize potential noise problems. Because the sound pressure levels are lowerat both ends of the unit than at the sides, the chiller should be oriented such that the controlbox end or end opposite the control box faces the direction where the lowest sound level isrequired.

The control box end provides an excellent acoustic barrier to the compressor sound as itcovers one full end of the unit. The sound pressure levels at the control box end will be 5dBA less than on the sides. On the end opposite the control box, the compressor sound isblocked by the coil structure and evaporator and is naturally attenuated by distance as thecompressors are located approximately ¾ the length of the unit away from this end. Thesound pressure levels at the end opposite the control box will be 4 dBA less than on thesides.

Sound IsolationThe low sound level for the ALS screw chiller satisfies most customer requirements.However, there may be applications where even lower sound levels may be required. Themost effective isolation method is to locate the unit away from sound sensitive areas. Avoidlocations beneath windows or between structures where normal operating sounds may beobjectionable. Isolating water lines, electrical conduit and the unit itself can reducestructurally transmitted sound. Wall sleeves and rubber isolated piping hangers can be usedto reduce transmission of water or pump noise into occupied spaces, and flexible electricalconnections can be used to isolate sound through electrical conduit. Spring isolators are


effective in reducing the low amplitude sound generated by screw compressors and can beused for unit isolation in sound sensitive areas.

Figure 6, Sound Directionality

Sound Pressure Levels, Low Ambient OperationUnit operation at a lower ambient temperature than 95°F will also result in lower soundpressure levels. The sound pressure level will decrease approximately 1 dBA for ambientair temperatures between 85°F and 94°F, approximately 2 dBA for ambient air temperaturesbetween 75°F and 84°F, and approximately 3 dBA for ambient air temperatures between65°F and 74°F.

Sound Pressure Levels, Multiple UnitsMultiple air-cooled unit installations will have a higher sound level than a single unit. Twounits will have approximately 3 dB higher sound level of one unit, 4 units will beapproximately 6 dB louder, and 8 units approximately 9 dB louder than one unit.Sound ControlWalls adjacent to a unit (20 feet {6.1meters} or less) will reflect soundoutwards, increasing the soundpressure on the side away from thewall. This sound increase could be ashigh as 3 dB for one wall and as highas 6 dB for a corner location. Unitorientation and/or distance as notedabove will decrease sound levels.Sound levels can also be controlled by the installation of barrier walls. To be effective assound blockers, walls must be solid with no open penetrations. Sound tends to leak out ofopenings. Block walls with filler material and slots on the side facing the unit areespecially effective. The wall should be about 10 feet high (two feet higher than the unit)and located at least 10 feet away so as not to affect unit performance. A three-sidedenclosure will be the most effective solution and will reduce sound levels by about 10 dB.Remember that the wall will increase the sound level on the side opposite it by 3 to 6 dB(one or three sided wall).

Note: The effect of adjacent walls on air recirculation and restriction must always beconsidered when employing sound barrier walls.

C

o

n

t

r

o

l

Compressor

Compressor

Sound pressure levels per Table 7

Sound pressure levels per Table 7

Sound pressure levelshere 4 dBA lowerthan Table 7

Sound pressure levelshere 5 dBA lowerthan Table 7 Evaporator


Electrical DataTable 10, ALS 141C – ALS 218C, Electrical Data, Single-Point

POWER SUPPLY

FIELD WIRE HUB(Conduit Connection)

FIELD FUSE SIZE orHACR BREAKER SIZE

WIRE NOMINAL RECOM-

ALSUNITSIZE

VOLTS HZ

MINIMUMCIRCUIT

AMPACITY(MCA) QTY GAUGE QTY SIZE MENDED MAXIMUM

208 609 6 350 2 2.5 700 800230 558 6 300 2 2.5 700 700

141C 380 60 338 3 400 1 3.0 400 450460 278 3 300 1 2.5 350 350575 226 3 4/0 1 2.0 250 300208 686 6 500 2 3.0 800 800230 626 6 400 2 3.0 700 800

150C 380 60 379 3 500 1 3.0 450 500460 313 3 400 1 3.0 350 450575 252 3 250 1 2.5 300 350208 758 6 500 2 3.0 1000 1000230 693 6 500 2 3.0 800 800

171C 380 60 419 6 4/0 See Note 9 2 2.0 500 500460 346 3 500 1 3.0 400 450575 277 3 300 1 2.5 350 350208 813 6 600 2 3.0 1000 1000230 742 6 500 2 3.0 1000 1000

186C 380 60 449 6 4/0 See Note 9 2 2.0 500 600460 370 3 500 1 3.0 450 500575 296 3 350 1 2.5 350 400208 825 6 600 2 3.0 1000 1000230 753 6 500 2 3.0 1000 1000

190C 380 60 456 6 4/0 See Note 9 2 2.0 600 600460 376 3 500 1 3.0 450 500575 301 3 350 1 2.5 350 400208* 869* 6 600* 2 3.0 1000 1200230 792 6 600 2 3.0 1000 1000

200C 380 60 480 6 250 2 2.5 600 600460 395 6 4/0 See Note 9 2 2.0 450 500575 316 3 400 1 3.0 350 400208* 869* 6 600* 2 3.0 1000 1200230 792 6 600 2 3.0 1000 1000

206C 380 60 480 6 250 2 2.5 600 600460 395 6 4/0 See Note 9 2 2.0 450 500575 316 3 400 1 3.0 350 400208* 897* 6 600* 2 3.0 1000 1200230 812 6 600 2 3.0 1000 1000

218C 380 60 489 6 250 2 2.5 600 600460 406 6 4/0 See Note 9 2 2.0 450 500575 326 3 400 1 3.0 400 450

Notes1. (*) Table based on 75°C field wire except (*) which require 90°C field wire.2. A “HACR” breaker is a circuit breaker designed for use on equipment with multiple motors. It stands for Heating, Air Conditioning, Refrigeration.3. Complete notes are on page 29.


Table 11, ALS 141C – ALS 218C, Electrical Data, Multiple-PointELECTRICAL CIRCUIT 1 (COMP 1) ELECTRICAL CIRCUIT 2 (COMP 2)

POWER SUPPLY FIELDFUSING POWER SUPPLY FIELD FUSING

FIELD WIREHUB

ConduitConnection

FIELD WIREHUB

(ConduitConnection)

ALSUNITSIZE

VOLTS HZMINIMUMCIRCUIT

AMPS(MCA)

QTY WIREGAUGE QTY HUB

SIZE

RECFUSESIZE

MAXFUSESIZE

MINIMUMCIRCUIT

AMPS(MCA)

QTY WIREGAUGE QTY HUB

SIZE

RECFUSESIZE

MAXFUSESIZE

208 335 3 400 1 3.0 400 500 335 3 400 1 3.0 400 500

230 307 3 350 1 2.5 400 500 307 3 350 1 2.5 400 500

141C 380 60 186 3 3/0 1 2.0 225 300 186 3 3/0 1 2.0 225 300

460 153 3 2/0 1 1.5 200 250 153 3 2/0 1 1.5 200 250

575 124 3 1 1 1.5 150 200 124 3 1 1 1.5 150 200

208 335 6 4/0 2 2.0 400 500 412 6 4/0 2 2.0 500 700

230 307 3 350 1 2.5 400 500 375 3 500 1 3.0 450 600

150C 380 60 186 3 3/0 1 2.0 225 300 227 3 4/0 1 2.0 300 350

460 153 3 2/0 1 1.5 200 250 188 3 3/0 1 2.0 225 300

575 124 3 1 1 1.5 150 200 150 3 1/0 1 1.5 200 250

208 417 6 4/0 2 2.0 500 700 417 6 4/0 2 2.0 500 700

230 381 6 3/0 2 2.0 450 600 381 6 3/0 2 2.0 450 600

171C 380 60 230 3 4/0 1 2.0 300 350 230 3 4/0 1 2.0 300 350

460 191 3 3/0 1 2.0 225 300 191 3 3/0 1 2.0 225 300

575 153 3 2/0 1 1.5 200 250 153 3 2/0 1 1.5 200 250

208 417 6 4/0 2 2.0 500 700 472 6 250 2 2.5 600 800

230 381 6 3/0 2 2.0 450 600 430 6 4/0 2 2.0 500 700

186C 380 60 230 3 4/0 1 2.0 300 350 260 3 300 1 2.5 350 450

460 191 3 3/0 1 2.0 225 300 214 3 4/0 1 2.0 300 350

575 153 3 2/0 1 1.5 200 250 171 3 2/0 1 1.5 225 250

208 423 6 4/0 2 2.0 500 700 478 6 250 2 2.5 600 800

230 387 6 3/0 2 2.0 500 600 436 6 4/0 SeeNote 9 2 2.0 600 700

190C 380 60 234 3 250 1 2.5 300 400 264 3 300 1 2.5 350 450

460 193 3 3/0 1 2.0 250 300 217 3 4/0 1 2.0 300 350

575 155 3 2/0 1 1.5 200 250 174 3 2/0 1 1.5 225 300

208 478 6 250 2 2.5 600 800 478 6 250 2 2.5 600 800

230 436 6 4/0 2 2.0 600 700 436 6 4/0 SeeNote 9 2 2.0 600 700

200C 380 60 264 3 300 1 2.5 350 450 264 3 300 1 2.5 350 450

460 217 3 4/0 1 2.0 300 350 217 3 4/0 1 2.0 300 350

575 174 3 2/0 1 1.5 225 300 174 3 2/0 1 1.5 225 300

208 478 6 250 2 2.5 600 800 478 6 250 2 2.5 600 800

230 436 6 4/0 SeeNote 9 2 2.0 600 700 436 6 4/0 See

Note 9 2 2.0 600 700

206C 380 60 264 3 300 1 2.5 350 450 264 3 300 1 2.5 350 450

460 217 3 4/0 1 2.0 300 350 217 3 4/0 1 2.0 300 350

575 174 3 2/0 1 1.5 225 300 174 3 2/0 1 1.5 225 300

208 492 6 250 2 2.5 600 800 492 6 250 2 2.5 600 800

230 445 6 4/0 SeeNote 9 2 2.0 600 700 445 6 4/0 See

Note 9 2 2.0 600 700

218C 380 60 269 3 300 1 2.5 350 450 269 3 300 1 2.5 350 450

460 223 3 4/0 1 2.0 300 350 223 3 4/0 1 2.0 300 350

575 179 3 3/0 1 2.0 225 300 179 3 3/0 1 2.0 225 300NOTE:1. Table based on 75°C field wire2. Complete notes are on page 29


Table 12, ALS141C – ALS 218C, Compressor and Condenser Fan Motor Amp DrawRATED LOAD AMPS L R A SOLID-STATE STARTING INRUSH

AMPS PER COMPRESSORALSUNITSIZE

VOLTS HZCIRCUIT #1 CIRCUIT #2

FANMOTORS

FLA(EACH)

NO OFFAN

MOTORSFAN

MOTORS(EACH) CIRCUIT #1 CIRCUIT #2

208 245 245 5.8 10 23.7 735 735230 222 222 5.8 10 21.4 666 666

141C 380 60 135 135 3.4 10 14.4 405 405460 111 111 2.8 10 10.7 333 333575 90 90 2.3 10 11.5 270 270208 245 306 5.8 10 23.7 735 918230 222 277 5.8 10 21.4 666 831

150C 380 60 135 168 3.4 10 14.4 405 504460 111 139 2.8 10 10.7 333 417575 90 111 2.3 10 11.5 270 333208 306 306 5.8 12 23.7 918 918230 277 277 5.8 12 21.4 831 831

171C 380 60 168 168 3.4 12 14.4 504 504460 139 139 2.8 12 10.7 417 417575 111 111 2.3 12 11.5 333 333208 306 350 5.8 12 23.7 918 918230 277 316 5.8 12 21.4 831 831

186C 380 60 168 192 3.4 12 14.4 504 504460 139 158 2.8 12 10.7 417 417575 111 126 2.3 12 11.5 333 333208 306 350 5.8 14 23.7 918 1050230 277 316 5.8 14 21.4 831 948

190C 380 60 168 192 3.4 14 14.4 504 576460 139 158 2.8 14 10.7 417 474575 111 126 2.3 14 11.5 333 378208 350 350 5.8 14 23.7 1050 1050230 316 316 5.8 14 21.4 948 948

200C 380 60 192 192 3.4 14 14.4 576 576460 158 158 2.8 14 10.7 474 474575 126 126 2.3 14 11.5 378 378208 350 350 5.8 14 23.7 1050 1050230 316 316 5.8 14 21.4 948 948

206C 380 60 192 192 3.4 14 14.4 576 576460 158 158 2.8 14 10.7 474 474575 126 126 2.3 14 11.5 378 378208 350 350 7.8 14 30.5 1050 1050230 316 316 7.2 14 27.6 948 948

218C 380 60 192 192 4.1 14 20.0 576 576460 158 158 3.6 14 13.8 474 474575 126 126 3.0 14 11.5 378 378

NOTE: Complete notes are on page 29


Table 13, ALS 141C – ALS 218C, Customer Wiring Information With Single-Point PowerWIRING TO STANDARD UNIT POWER BLOCK WIRING TO OPTIONAL NONFUSED

DISCONNECT SWITCH IN UNITALSUNITSIZE

VOLTS HZ TERMINAL SIZEAMPS

CONNECTOR WIRE RANGEPER PHASE

(COPPER WIRE ONLY)SIZE

CONNECTOR WIRE RANGEPER PHASE

(COPPER WIRE ONLY)208 840 (2) 2 to 600 MCM 800 (3) 3/0 to 400 MCM230 840 (2) 2 to 600 MCM 600 (2) 250 to 350 MCM

141C 380 60 840 (2) 2 to 600 MCM 400 (1) 250 to 500 MCM460 840 (2) 2 to 600 MCM 400 (1) 250 to 500 MCM575 840 (2) 2 to 600 MCM 250 (1) 4 to 350 MCM208 840 (2) 2 to 600 MCM 800 (2) 500 to 700 MCM230 840 (2) 2 to 600 MCM 800 (3) 3/0 to 400 MCM

150C 380 60 840 (2) 2 to 600 MCM 400 (1) 250 to 500 MCM460 840 (2) 2 to 600 MCM 400 (1) 250 to 500 MCM575 840 (2) 2 to 600 MCM 400 (1) 250 to 500 MCM208 840 (2) 2 to 600 MCM 800 (2) 500 to 700 MCM230 840 (2) 2 to 600 MCM 800 (2) 500 to 700 MCM






218C 380 60 840 (2) 2 to 600 MCM 600 (2) 250 to 350 MCM460 840 (2) 2 to 600 MCM 600 (2) 250 to 350 MCM575 840 (2) 2 to 600 MCM 400 (1) 250 to 500 MCM

NOTE:1. Terminal size amps are the maximum amps that the power block is rated for.2. Complete notes are on page 29.


Table 14, ALS 141C–ALS 218C, Wiring Information with Multiple-Point Power w/o DisconnectWIRING TO UNIT POWER BLOCK

TERMINAL SIZE (AMPS) CONNECTOR WIRE RANGE PER PHASE (COPPER WIRE ONLY)ALSUNITSIZE

VOLTS HZCKT 1 CKT 2 CKT 1 CKT 2

208 840 840 (2) #2 to 600 MCM (2) #2 to 600 MCM230 840 840 (2) #2 to 600 MCM (2) #2 to 600 MCM

141C 380 60 840 840 (2) #2 to 600 MCM (2) #2 to 600 MCM460 840 840 (2) #2 to 600 MCM (2) #2 to 600 MCM575 840 840 (2) #2 to 600 MCM (2) #2 to 600 MCM208 840 840 (2) #2 to 600 MCM (2) #2 to 600 MCM230 840 840 (2) #2 to 600 MCM (2) #2 to 600 MCM

150C 380 60 840 840 (2) #2 to 600 MCM (2) #2 to 600 MCM460 840 840 (2) #2 to 600 MCM (2) #2 to 600 MCM575 840 840 (2) #2 to 600 MCM (2) #2 to 600 MCM













NOTES:1. Terminal size amps are the maximum amps that the power block is rated for.2. See Table 15 for multiple point with Disconnect Switch connections.3. Complete notes are on page 29.


Table 15, ALS 141C –218C, Wiring Data with Multiple-Point Power w/ Disconnect SwitchWIRING TO UNIT DISCONNECT SWITCH

TERMINAL SIZE (AMPS) CONNECTOR WIRE RANGE PER PHASE (COPPER WIRE ONLY)ALSUNITSIZE

VOLTS HZCKT 1 CKT 2 CKT 1 CKT 2

208 400 400 (1) 250 to 500 MCM (1) 250 to 500 MCM230 400 400 (1) 250 to 500 MCM (1) 250 to 500 MCM

141C 380 60 225 225 (1) 4 to 4/0 (1) 4 to 4/0460 150 150 (1) 4 to 4/0 (1) 4 to 4/0575 150 150 (1) 4 to 4/0 (1) 4 to 4/0208 400 400 (2) 3/0 to 250 MCM (2) 3/0 to 250 MCM230 400 400 (1) 250 to 500 MCM (1) 250 to 500 MCM

150C 380 60 225 225 (1) 4 to 4/0 (1) 4 to 4/0460 150 225 (1) 4 to 4/0 (1) 4 to 4/0575 150 150 (1) 4 to 4/0 (1) 4 to 4/0

208 400 400 (2) 3/0 to 250 MCM (2) 3/0 to 250 MCM230 400 400 (2) 3/0 to 250 MCM (2) 3/0 to 250 MCM

171C 380 60 225 225 (1) 4 to 4/0 (1) 4 to 4/0460 225 225 (1) 4 to 4/0 (1) 4 to 4/0575 150 150 (1) 4 to 4/0 (1) 4 to 4/0

208 400 600 (2) 3/0 to 250 MCM (2) 250 to 350 MCM230 400 600 (2) 3/0 to 250 MCM (2) 250 to 350 MCM

186C 380 60 225 250 (1) 4 to 4/0 (1) 4 to 350 MCM460 225 225 (1) 4 to 4/0 (1) 4 to 4/0575 150 225 (1) 4 to 4/0 (1) 4 to 4/0

208 400 600 (2) 3/0 to 250 MCM (2) 250 to 350 MCM230 400 600 (2) 3/0 to 250 MCM (2) 250 to 350 MCM

190C 380 60 225 250 (1) 4 to 4/0 (1) 4 to 350 MCM460 225 225 (1) 4 to 4/0 (1) 4 to 4/0575 150 225 (1) 4 to 4/0 (1) 4 to 4/0


200C 380 60 250 250 (1) 4 to 350 MCM (1) 4 to 350 MCM460 225 225 (1) 4 to 4/0 (1) 4 to 4/0575 225 225 (1) 4 to 4/0 (1) 4 to 4/0





NOTE:1. Terminal size amps are the maximum amps that the disconnect switch is rated for.2. Complete notes are on page 29.


Electrical Data Notes1. Allowable voltage limits

Unit nameplate 208V/60Hz/3PH: 187V to 229VUnit nameplate 230V/60Hz/3Ph: 207V to 253VUnit nameplate 380V/60Hz/3Ph: 342V to 418VUnit nameplate 460V/60Hz/3Ph: 414V to 506VUnit nameplate 575V/60Hz/3Ph: 517V to 633V

2. Unit wire size ampacity (MCA) is equal to 125% of the largest compressor-motor RLA plus 100%of RLA of all other loads in the circuit including control transformer. Wire size ampacity forseparate 115V control circuit power is 15 amps for ALS 141C through ALS 218C.

3. Compressor RLA values are for wire sizing purposes only but do reflect normal operating currentdraw at unit rated capacity. If unit is equipped with SpeedTrol condenser fan motors, the firstmotor on each refrigerant circuit is a single phase, 1 hp motor, with a FLA of 2.8 amps at 460 volts(5.6 amps at 208/230 volts). If the unit is not equipped with SpeedTrol, the standard fan motorwill be 1 1/2 hp, 3-phase (for ALS 141C-206C except ALS 218C which will be 2 hp, 3-phase) withFLA as shown in the electrical tables.

4. If the unit is equipped with SpeedTrol motors, the first motor on each refrigerant circuit is a singlephase, 1 hp motor, with a LRA of 7.3 amps at 460 volts (14.5 amps at 208/230 volts). If the unit isnot equipped with SpeedTrol, the standard fan motor will be 1 1/2 hp, 3-phase with a LRA asshown in the electrical tables.

5. Single point power supply requires a single disconnect to supply electrical power to the unit. Thispower must be fused.

6. Multiple point power supply requires two independent power circuits on ALS 141C-ALS 218C.7. All field wiring to unit power block or optional nonfused disconnect switch must be copper.8. Field wire size values given in tables apply to 75°C rated wire per NEC except for ALS 200C-ALS

218C for 208V single point application which require 90°C rated wire or as noted.9. External disconnect switch(s) or HACR breakers must be field supplied. Note: On single point

power units a non-fused disconnect switch in the cabinet is available as an option.10. All wiring must be done in accordance with applicable local and national codes.11. Recommended time delay fuse size or HACR circuit breakers is equal to 150% of the largest

compressor motor RLA plus 100% of remaining compressor RLAs and the sum of condenser fanFLAs.

12. Maximum time delay fuse size or HACR circuit breakers is equal to 225% of the largestcompressor-motor RLA plus 100% of remaining compressor RLAs and the sum of condenser fanFLAs.

13. MCA may vary slightly due to fan motor options such as Speedtrol, TEFC.


Field Wiring Diagram

Figure 7, Typical Field Wiring Diagram


Physical Data

Table 16, Physical Data, ALS 141C – ALS 186CALS MODEL NUMBER

DATA 141C 150C 171C 186CCkt 1 Ckt 2 Ckt 1 Ckt 2 Ckt 1 Ckt 2 Ckt 1 Ckt 2

BASIC DATAUnit Cap. @ ARI Conditions, tons (kW) 124.5 (436) 139.7 (489) 155.8 (545) 170 (595)Unit Operating Charge R-22, lbs (kg) 140 (63.5) 140 (63.5) 140 (63.5) 150 (68.1) 150 (68.1) 150 (68.1) 150 (68.1) 160 (72.6)

Cabinet DimensionsL x W x H, in. (mm)

228.7 x 83.4 x 92.5(5809 x 2118 x 2350)

228.7 x 83.4 x 92.5(5809 x 2118 x 2350)

228.7 x 83.4 x 92.5(5809 x 2118 x 2350)

228.7 x 83.4 x 92.5(5809 x 2118 x 2350)

Unit Operating Weight, lbs. (kg) 9700 (4395) 9880 (4475) 9890 (4480) 9900 (4485)Unit Shipping Weight, lbs (kg) 9420 (4270) 9550 (4325) 9560 (4330) 9570 (4335)

COMPRESSORS, SCREW, SEMI-HERMETICNominal Capacity, tons (kW) 65 (230) 65 (230) 65 (230) 80 (280) 80 (280) 80 (280) 80 (280) 95 (335)

CONDENSERS, HIGH EFFICIENCY FIN AND TUBE TYPE WITH INTEGRAL SUBCOOLERCoil Face Area, ft. (m2) 115.6 (10.7) 115.6 (10.7) 115.6 (10.7) 115.6 (10.7) 115.6 (10.7) 115.6 (10.7) 115.6 (10.7) 115.6 (10.7)

Finned Height x Finned Length ft. (mm)

80 x 208(2032 x 5283)

80 x 208(2032 x 5283)

80 x 208(2032 x 5283)

80 x 208(2032 x 5283)

80 x 208(2032 x 5283)

80 x 208(2032 x 5283)

80 x 208(2032 x 5283)

80 x 208(2032 x 5283)

Fins Per Inch x Rows Deep 16 x 3 16 x 3 16 x 3 16 x 3 16 x 3 16 x 3 16 x 3 16 x 3CONDENSER FANS, DIRECT DRIVE PROPELLER TYPENo. of Fans -- Fan Diameter, in. (mm) 10 - 28 (711) 10 - 28 (711) 12 - 28 (711) 12 - 28 (711)

No. of Motors -- hp (kW) 10 - 1.5 (1.1) 10 - 1.5 (1.1) 12 - 1.5 (1.1) 12 - 1.5 (1.1)Fan & Motor RPM, 60Hz 1140 1140 1140 114060 Hz Fan Tip Speed, fpm 8357 8357 8357 8357

60 Hz Total Unit Airflow, cfm 90200 90200 108240 108240EVAPORATOR, DIRECT EXPANSION

Shell Dia.-Tube Length in.(mm) - in. (mm)

12.75 – 94.6(324 - 2403)

14.0 – 95.5(356 - 2425)

14.0 – 95.5(356 - 2425)

14.0 – 95.5(356 - 2425)

Evaporator R-22 Charge lbs (kg) 34 (15.4) 34 (15.4) 45 (20.4) 45 (20.4) 45 (20.4) 45 (20.4) 45 (20.4) 45 (20.4)Water Volume, gallons (liters) 34 (129) 40 (151) 40 (151) 40 (151)

Max. Water Pressure, psi (kPa) 152 (1048) 152 (1048) 152 (1048) 152 (1048)Max. Refrigerant Pressure, psi (kPa) 300 (2068) 300 (2068) 300 (2068) 300 (2068)

Table 17, Physical Data, ALS 190C – ALS 218CALS MODEL NUMBER

DATA 190C 200C 206C 218CCkt 1 Ckt 2 Ckt 1 Ckt 2 Ckt 1 Ckt 2 Ckt 1 Ckt 2

BASIC DATAUnit Cap. @ ARI Conditions, tons (kW) 173.1 (606) 184.2 (645) 190.3 (666) 204.4 (715)Unit Operating Charge R-22, lbs (kg) 170 (77.0) 180 (81.5) 180 (81.5) 180 (81.5) 185 (83.8) 185 (83.8) 210 (95.1) 210 (95.1)

Cabinet Dimensions,L x W x H, in. (mm)

263.4 x 83.4 x 92.5(6690 x 2118 x 2350)

263.4 x 83.4 x 92.5(6690 x 2118 x 2350)

263.4 x 83.4 x 92.5(6690 x 2118 x 2350)

263.4 x 83.4 x 92.5(6690 x 2118 x 2350)

Unit Operating Weight, lbs. (kg) 10620 (4810) 10630 (4815) 10960 (4965) 11550 (5230)Unit Shipping Weight, lbs (kg) 10290 (4660) 10300 (4665) 10500 (4755) 10730 (4860)

COMPRESSORS, SCREW, SEMI-HERMETICNominal Capacity, tons (kW) 80 (280) 95 (335) 95 (335) 95 (335) 95 (335) 95 (335) 95 (335) 95 (335)

CONDENSERS, HIGH EFFICIENCY FIN AND TUBE TYPE WITH INTEGRAL SUBCOOLERCoil Face Area, ft. (m2) 135.0 (12.5) 135.0 (12.5) 135.0 (12.5) 135.0 (12.5) 135.0 (12.5) 135.0 (12.5) 135.0 (12.5) 135.0 (12.5)

Finned Height x Finned Lengthft. (mm)

80 x 243(2032 x 6172)

80 x 243(2032 x 6172)

80 x 243(2032 x 6172)

80 x 243(2032 x 6172)

80 x 243(2032 x 6172)

80 x 243(2032 x 6172)

80 x 243(2032 x 6172)

80 x 243(2032 x 6172)

Fins Per Inch x Rows Deep 16 x 3 16 x 3 16 x 3 16 x 3 16 x 3 16 x 3 16 x 3 16 x 3CONDENSER FANS, DIRECT DRIVE PROPELLER TYPENo. of Fans -- Fan Diameter, in. (mm) 14 - 28 (711) 14 - 28 (711) 14 - 28 (711) 14 - 28 (711)

No. of Motors -- hp (kW) 14 - 1.5 (1.1) 14 - 1.5 (1.1) 14 - 1.5 (1.1) 14 - 2.0 (1.5)Fan & Motor RPM, 60Hz 1140 1140 1140 114060 Hz Fan Tip Speed, fpm 8357 8357 8357 8357

60 Hz Total Unit Airflow, cfm 126280 126280 126280 138908EVAPORATOR, DIRECT EXPANSION

Shell Dia. -- Tube Lengthin.(mm) - in. (mm)

14.0 – 95.5(356 - 2425)

14.0 – 95.5(356 - 2425)

16.0 – 96.8(406 - 2459)

20.0 – 99.7(508 -2532)

Evaporator R-22 Charge lbs (kg) 45 (20.4) 45 (20.4) 45 (20.4) 45 (20.4) 57 (25.8) 57 (25.8) 68 (30.8) 68 (30.8)Water Volume, gallons (liters) 40 (151) 40 (151) 55 (208) 98 (371)

Max. Water Pressure, psi (kPa) 152 (1048) 152 (1048) 152 (1048) 152 (1048)Max. Refrigerant Pressure, psi (kPa) 300 (2068) 300 (2068) 300 (2068) 300 (2068)

32ALS 141C

– 218CProduct M

anual ALS-5

Dim

ensions, ALS

Figure 8, Dim

ensions, ALS 141C

– ALS 218C

Note: S

ee page 33 for lifting locations, mounting locations, w

eights and mounting loads.

Notes:1. All dimensions in inches (mm).2. Only water connections as shown are available.

Victaulic ConnectionsCouplings by Others.

PowerCenter

ControlCenter

83.4(2118)

Control wiringentry knockoutsfor ½ (13)conduit bothsides of unit.

92.5(2350)

6.0(152)

48.6(1234)

8.1(206)

Power entry location this side only.2 additional knockouts 6.0 (152)above and below this openingfor multiple power supply.

“A”

Standard Coil Guards

28.5 (724)

6.50 (165)

“D”

“C”“B”

OutletInletCompressor#1

Compressor#2

AirDischarge

“E”

“Y”

141C150C171C186C190C200C206C218C

Conn. SizeIn.YXEDCB

ALSSize

Evaporator Center of Gravity

Note: Remote evaporatorconnections in this location.

“X”

A


Figure 9, ALS141C – ALS186C Lifting and Mounting Locations

M1

M2

M3

M4

M5

M6

L1

L2

L3

L4

CO

NTR

OL

BOX

36 (914)102 (2591)

192 (4877)

46 (1168)161 (4089)

2 (51)Typical Spacingfor IsolatorMounting (6)

83.4(2118)

Lifting Weight for Each Pointlb (kg)

Mounting Loads for Each Point lb. (kg)ALS

Model L1 & L2 L3 & L4 M1 & M2 M3 & M4 M5 & M6

Operating Wtlb. (kg)

Shipping Wt.lb. (kg)

Copper FinAdd

141 2585 (1171) 2125 (963) 1835 (831) 1785 (809) 1230 (557) 9700 (4394) 9420 (4267) 1370 (620)150 2570 (1164) 2205 (999) 1830 (829) 1805 (818) 1305 (591) 9880 (4476) 9550 (4326) 1370 (620)171 2570 (1164) 2210 (1001) 1830 (829) 1810 (820) 1305 (591) 9890 (4472) 9560 (4331) 1370 (620)186 2575 (1166) 2210 (1001) 1830 (829) 1810 (820) 1310 (593) 9900 (4485) 9570 (4335) 1370 (620)

NOTES:

1. 2 ½ in. (63.5 mm) lifting holes at location "L" on side of base rail.

2. 1 in. (25.4 mm) mounting holes at location "M" on bottom of base rail.

Figure 10, ALS190C - ALS218C Lifting and Mounting Locations

L1 L3

L2 L4

M1

M2

M3

M4

M5

M6

CO

NTR

OL

BOX

36 (914)123 (3124)

224 (5690)

46 (1168)195 (4953)

2 (51)Typical Spacingfor IsolatorMounting (6)

83.4(2118)

Lifting Weight for Each Pointlb (kg)

Mounting Loads for Each Point lb. (kg)ALS

Model L1 & L2 L3 & L4 M1 & M2 M3 & M4 M5 & M6

Operating Wtlb. (kg)

Shipping Wt.lb. (kg)

Copper FinAdd

190 2915 (1320) 2230 (1010) 2010 (910) 2135 (967) 1165 (527) 10620 (4811) 10290 (4661) 1610 (730)200 2920 (1323) 2230 (1010) 2015 (913) 2135 (967) 1165 (527) 10630 (4815) 10300 (4666) 1610 (730)206 2940 (1332) 2310 (1046) 2000 (906) 2240 (1015) 1240 (562) 10960 (4965) 10500 (4756) 1610 (730)218 2960 (1341) 2405 (1089) 1985 (899) 2425 (1098) 1365 (618) 11550 (5232) 10730 (4861) 1610 (730)


Installation and Application

RiggingCare must be taken to avoid dropping the unit during unloading or moving as this can resultin serious property damage and personal injury. Do not push or pull the unit from anythingother than the base, and block the forklift away from the unit to prevent damage to the sheetmetal cabinet and end frame. Do not lift the unit with a fork lift truck. To lift the unit, two(or three or four depending on unit size) 2 1/2 inch (65mm) diameter lifting holes areprovided on each side in the base of the unit. Lengthwise and crosswise spreader bars mustbe used between rigging lines to prevent damage to the condenser coils or unit cabinet andto keep the lines coming up from the rigging holes to the spreaders vertical.

Unit PlacementFor roof mounted applications, the unit must be installed on a steel channel or I-beam frameto support the unit above the roof. For ground level applications, the unit must be installedon a substantial base that will not settle. McQuay recommends a one piece concrete slabwith footings extended below the frost line, and the installation engineer should determineits necessity. The foundation must be level within 1/2 inch (13mm) over its length andwidth and strong enough to support the unit's operating weight as listed in the Physical Datatables.

On ground level applications fin protection against vandalism is recommended, either bythe optional factory installed condenser coil guard or a field installed screen fence. Notethat the fence must allow free flow of air to the condenser coil for proper unit operation.

ClearancesAir-cooled units require free air flow to and from the condenser coils. Units should beinstalled per the listed installation clearances. There must be no obstructions above thefan discharge that may cause air recirculation. Air restriction and recirculation can causehigh pressure trips and will reduce capacity, efficiency, and compressor life. Do not installductwork on condenser fans. Structures, other equipment, fencing, plants, and trees mustbe considered for air flow interference. Ventilators and any sources of contaminated orheated discharges gases and air will affect system performance. Pit type installation mustmeet McQuay’s requirements.

Service AccessEach end of the unit must be accessible after installation for periodic service work.Compressors, filter-driers, and manual liquid line shutoff valves must be accessible on eachside of the unit adjacent to the control box. High pressure and low pressure transducers aremounted on the compressor. The cooler barrel heater thermostat is located on the cooler.Compressor overloads, microprocessor, and most other operational, safety and startingcontrols are located in the unit control box.

The electric disconnect switch should be mounted adjacent to the unit but not directly onunit sheet metal components.

On all ALS units the condenser fans and motors can be removed from the top of the unit.The complete fan/motor assembly can be removed for service. The fan blade and fan motorrain shield must be removed for access to wiring terminals at the top of the motor.

Consult minimum clearance requirement drawings on the following pages for equipmentspace layout.


Figure 11, Service Clearance Requirements, ALS 141 - 218

Notes:1. Minimum side clearance between two units is 12 feet (3.7 meters).2. Unit must not be installed in a pit or enclosure that is deeper or taller than the height of the unit

unless extra clearance is provided per note 4.3. Minimum clearance on each side is 8 feet (2.4 meters) when installed in a pit no deeper than the

unit height.4. Minimum side clearance to a side wall or building taller than the unit height is 8 feet (2.4 meters)

provided no solid wall above 6 feet (1.8 meters) is closer than 12 feet (3.7 meters) to the oppositeside of the unit.

5. The removable post for compressor service access must not be blocked at either side of the unit.6. Do not mount electrical conduits, etc., above the side rail on either side of the unit. Do not block

service access to compressor controls or refrigerant driers or valves.7. There must be no obstruction of the fan discharge.


Restricted Air FlowGeneralThe clearances required for design-life operation of ALS air-cooled condensers aredescribed in the previous section. Occasionally, these clearances cannot be maintained dueto site restrictions such as units being too close together or a fence or wall restrictingairflow, or both.

Fortunately the McQuay ALS chillers have several features that can mitigate the penaltiesattributable to restricted airflow.

• The condenser section is “U” shaped, as shown below. This allows inlet air for thesecoils to come in from either side. A vertical coil and its adjacent horizontal coil aremanifolded together to serve one compressor circuit. Every compressor always has itsown independent refrigerant circuit.

• The MicroTech control is proactive in response to “off-design conditions”. In the caseof single or compounded influences restricting airflow to the unit, the microprocessorwill act to keep the compressor(s) running (at reduced capacity) rather than allowing ashut-off on high discharge pressure.

• The MicroTech control can be programmed to sequence the compressors in the mostadvantageous way. For example, in the diagram shown below, it might be desirable toprogram circuit #1 to be the lag circuit (last circuit to reach full load) during periods ofhigh ambient temperatures.

Figure 12, Coil and Fan Arrangement

The following sections discuss the most common situations of condenser air restriction andgive capacity and power adjustment factors for each. Note that in unusually severeconditions, the MicroTech controller would adjust the unit operation to remain online untila less severe condition is reached.


Case 1, Building or Wall on One Side of One UnitThe existence of a screening wall or the wall of a building in close proximity to an air-cooled chiller is common in both rooftop and ground level applications. Hot airrecirculation on the coils adjoining the wall will increase compressor discharge pressure,decreasing capacity and increasing power consumption. Only the compressor(s) connectedto these coils will be affected. Circuits opposite the wall are unaffected.

When close to a wall, it is desirable to place chillers on the North or East side of them. It isalso desirable to have prevailing winds blowing parallel to the unit’s long axis. The worstcase is to have wind blowing hot discharge air into the wall.

Figure 13, Unit Adjacent to Wall

Figure 14, Adjustment Factors


Case 2, Two Units Side By SideTwo or more units sited side by side are common. If spaced closer than 12 feet (3.7 meters)it is necessary to adjust the performance of each unit; circuits adjoining each other areaffected. NOTE: This case applies only to two units side by side. See Case 3 for three ormore parallel units. If one of the two units also has a wall adjoining it, see Case 1. Add thetwo adjustment factors together and apply to the unit located between the wall and the otherunit.

Mounting units end to end will not necessitate adjusting performance. Depending on theactual arrangement, sufficient space must be left between the units for access to the controlpanel door opening and/or evaporator tube removal. See “Clearance” section of this guidefor requirements for specific units.

Pit or solid wall surrounds should not be used where the ambient air temperature exceeds105°F (40°C).

Figure 15, Two Units Side by Side

Figure 16, Adjustment Factor


Case 3, Three or More Units Side By SideWhen three or more units are side by side, the outside chillers (1 and 3 in this case) areinfluenced by the middle unit only on their inside circuits. Their adjustment factors will bethe same as Case 2. All inside units (only number 2 in this case) are influenced on bothsides and must be adjusted by the factors shown below.

Figure 17, Three or More Units



Case 4, Open Screening WallsDecorative screening walls are often used to help conceal a unit either on grade or on arooftop. These walls should be designed such that the combination of their open area anddistance from the unit do not require performance adjustment. It is assumed that the wallheight is equal to or less than the unit height when mounted on its base support. This isusually satisfactory for concealment. If the wall height is greater than the unit height, seeCase 5, Pit Installation.

The distance from the ends of the unit to the end walls should be sufficient for service,opening control panel doors, and pulling evaporator tubes, as applicable.

If each side wall is a different distance from the unit, the distances can be averagedproviding either wall is not less than 8 feet (2.4 meters) from the unit. For example, do notaverage 4 feet and 20 feet to equal 12 feet.

Figure 19, Open Screening Walls

Figure 20, Wall Free Area vs Distance


Case 5, Pit/Solid Wall InstallationPit installations can cause operating problems and great care should be exercised if they areto be used on an installation. Recirculation and restriction can both occur. A solid wallsurrounding a unit is substantially the same as a pit and the data presented here should beused.

Steel grating is sometimes used to cover a pit to prevent accidental falls or trips into the pit..The grating material and installation design must be strong enough to prevent suchaccidents, yet provide abundant open area or serious recirculation problems will occur.Have any pit installation reviewed by McQuay application engineers prior to installation tomake sure it has sufficient air-flow characteristics. The installation design engineer mustapprove the work to avoid an unreasonable risk of accident.

Figure 21, Pit Installation



Chilled Water Systems

McQuay requires that chilled water piping for its chillers be designed and installed inconformance with the system recommendations described in (American Society of HeatingRefrigeration and Air-Conditioning Engineers, Inc.) ASHRAE Handbooks. Specificallythe 1996 Edition, HVAC Systems & Equipment, Chapter 12.

Multiple UnitsChillers are frequently installed in multiple. Doing so provides standby reliability andimproved performance, and is recommended. Multiplicity of machines however can resultin unexpected problems where chiller controls or capacity reduction are overlooked in thedesign. Single chiller installations are equally susceptible to application oversight. Thefollowing offers supplemental information to that discussed in ASHRAE for the purpose ofminimizing installation problems.

Water FlowChilled water systems are normally designed with leaving chilled water temperatures of40°F to 46°F (5°C to 8°C), a 10 degree F (6 degree C) water temperature difference and0.0001 fouling factor. Catalog performance tables display data for the chillers at theseconditions. Actual design may be different, and Product Manuals include adjustmentfactors or special rating tables to account for other conditions.

1. Addition of secondary coolants such as ethylene glycol

2. Variances from 10 degree F (6 degree C) water temperature differences

3. More than standard water fouling

4. Elevation and ambient air temperatures

Specifications and start-up procedures should:

1. Confirm that the chilled water piping system had been properly flushed out beforebeing connected to the chiller vessel.

2. Confirm that the piping contains

a) A cleanable strainer at the evaporator inlet to remove impurities before they reachthe chiller vessel

b) An expansion tank in the piping, and

c) An air vent located at the system high point to purge trapped air in the pipingsystem. An air vent is also located at the top of the direct expansion chiller vesseland in the water head of a flooded vessel evaporator or condenser. Note: Theevaporator will not provide venting and must not be the high point in the system.

All water systems include air in solution with the water. The percentage of air that can beretained in solution is a function of the water temperature and water pressure. Since thesetwo values change in both chilled and hot water systems, the presence of both b and ccomponents listed above are vital to the successful operation of the system.


The presence of a cleanable filter or strainer (2a above) in a chilled water piping system isfrequently taken for granted. The fact is that the filter or strainer may be inadequate for theinstallation or may be installed in the wrong location.

1. If the chilled water pump is located in the chilled water piping exiting the chiller vessel(down stream of the chiller), and the strainer is in its normal position ahead of thechilled water pump, then system impurities will be drawn, unfiltered through the chillervessel. Severe reduction in chiller performance or damage to the evaporator tubes isthe probable result.

2. Many chiller installations today are replacements for older less efficient machines orchillers with CFC refrigerants. Existing piping is drained down, opened to atmosphere,and reconnected to the new chiller vessel. Rust formed over the years and during thereplacement process can break loose, pass through a conventional strainer, and settle inthe chiller vessel that is frequently the lowest point in the piping system. Not only is ahigher capacity filter required for these installations, but chemical treatment of thewater is recommended immediately and should be maintained throughout theequipment life.

Figure 23, Typical Chilled Water Piping

Protect all field pipingagainst freezing

VibrationEliminator

VibrationEliminator

FlowSwitch

Balancingvalve

Gate valveValved

pressuregauge

Waterstrainer

Gate valve

Vent

Outlet

Drain

Note: The cross piping for the pressure gauge can be as small as ¼ inch. The purpose of this arrangement is to provide an easymethod to use one gauge to accurately measure both pressures

Checking Water FlowThe simplest method of checking water flow in a clean system (the chiller vessel has notbeen fouled nor is air bound), is to read the entering and leaving pressures and compare theactual pressure drop to the value published in the product catalog.

Pressure drops at the job are read in psi or feet of water (kPa). Published values aredisplayed in feet of water. Use the following formula to convert from one to another.

2.31 x PSI = Feet of water

or

Feet of water x 0.433 = PSI

System Water VolumeIt is important to have adequate water volume in the system to provide an opportunity forthe chiller to sense a load change, adjust to the change and stabilize. As the expected loadchange becomes more rapid, a greater water volume is needed. The system water volume isthe total amount of water in the evaporator, air handling products and associated piping. Ifthe water volume is too low, operational problems can occur including rapid compressor


cycling, rapid loading and unloading of compressors, erratic refrigerant flow in the chiller,improper motor cooling, shortened equipment life and other undesirable occurrences.

For normal comfort cooling applications where the cooling load changes relatively slowly,we recommend a minimum system volume of seven minutes times the flow rate (GPM).For example, if the design chiller flow rate is 400 GPM, we recommend a minimum systemvolume of 2800 gallons (400 GPM x 7 minutes).

For process applications where the cooling load can change rapidly, additional system watervolume is needed. A process example would be the cooling of hot metal objects. The loadwould be very stable until the hot metal is dipped into the water tank. Then, the load wouldincrease drastically. For this type of application, we recommend the normal comfortcooling recommendation addressed above plus three minutes of ballast for every 10% quickchange in load. For example, if the hot metal example load changes from a stable 50% loadto an immediate 100% load for metal cooling, the recommended system volume wouldincrease to 8800 gallons.

System volume = {400 GPM x 7 Minutes} + {(5 increment of 10% increase) x (3 Minutes)x 400 GPM} = 8800 Gallons

Since there are many other factors that can influence performance, systems maysuccessfully operate below these suggestions. However, as the water volume decreasesbelow these suggestions, the possibility of problems increases. We believe that theseguidelines should be an industry standard and not just recommendations from McQuay.

Freeze ProtectionMcQuay air-cooled chillers are equipped with thermostatically controlled heat tape underthe insulation of the evaporator barrels. The heater comes from the factory connected to thecontrol power circuit but can be rewired to a separate 120V (110V, 50 Hz) supply. If this isdone, the disconnect switch should be clearly marked to avoid accidental deactivation of theheater during freezing temperatures. The heater will provide freeze protection to -20°F(-29°C). However, this does not provide protection to the exposed chilled water piping.Unless the evaporator is flushed and drained as described in note 4 two or more of thefollowing recommendations should be part of the system design and be implemented.

1. Continuous circulation of water through the piping and heat exchanger.

2. Addition of the required concentration of a glycol anti-freeze to the circuit. This willresult in decreased capacity and increased pressure drop. Note: Do not use automotivegrade antifreezes that contain inhibitors harmful to chilled water systems. Only useglycols specifically designated for use in building cooling systems.

3. Addition of insulation and heat to any exposed piping and equipment.

4. Draining and flushing the chiller with glycol.


Table 18, Freeze ProtectionPercent Volume Glycol Concentration Required

For Freeze Protection For Burst ProtectionTemperature°F (°C) Ethylene Glycol Propylene Glycol Ethylene Glycol Propylene Glycol20 (6.7) 16 18 11 12

10 (-12.2) 25 29 17 200 (-17.8) 33 36 22 24

-10 (-23.3) 39 42 26 28-20 (-28.9) 44 46 30 30-30 (-34.4) 48 50 30 33-40 (-40.0) 52 54 30 35-50 (-45.6) 56 57 30 35-60 (-51.1) 60 60 30 35

Note:1. These figures are examples only and may not be appropriate to every situation. Generally, for an extended margin of

protection, select a temperature at least 5°F lower than the expected lowest ambient temperature. Inhibitor levels should beadjusted for solutions less than 30% glycol.

2. Glycol of less than 20% concentration is not recommended because of the potential for bacterial growth and loss of heattransfer efficiency.

Variable Speed PumpingVariable water flow involves changing the water flow through the evaporator as the loadchanges. McQuay chillers are designed for this duty provided that the rate of change inwater flow is slow and the minimum and maximum flow rates for the vessel are notexceeded.

The recommended change in water flow is listed in the table below. As the number ofstages of control increase, the slower the permissible rate of change in flow rate becomes.For the ALS control logic, there are timers that limit the rate of unloading or loadingallowed. Slow changes allow the chiller the opportunity to sense a change, react to thechange and stabilize preventing operational problems.

ALS Size Number ofCompressors

UnloadingSteps

Maximum allowable % perminute of flow change

141 to 218 2 8 10.0

For example, assume that an ALS with two compressors has a design flow of 500 GPM andthe minimum vessel flow rate of 300 GPM. The allowable amount of flow change is 200GPM. An ALS with two compressors has an allowable change rate of 10% of change perminute. Therefore, the maximum rate of change recommended would be 20 GPM/minute(200 X .10).

The water flow GPM through the vessel must remain between the minimum and maximumvalues listed on Figure 3. If flow drops below the minimum allowable, large reductions inheat transfer can occur. If the flow exceeds the maximum rate, excessive pressure drop andtube erosion can occur.


Electrical Connections

All wiring must be done in accordance with applicable local and national codes.

ALS units may be ordered with internal power wiring for either single or multiple pointpower connections. If single point power connection is ordered, a single power terminalblock is provided and wiring within the unit is sized in accordance with the U.S.A. NationalElectrical Code. A single field supplied disconnect is required or can be furnished as afactory option. If multiple point power wiring is ordered, two power connections arerequired for ALS 141C through ALS 218C. Wiring within the unit is sized in accordancewith the U.S.A. National Electrical Code. Separate field supplied or factory supplieddisconnects are required for each circuit.

Disconnecting means are addressed by Article 440 of the U.S.A. National Electrical Code(NEC) which requires "disconnecting means capable of disconnecting air conditioning andrefrigerating equipment including motor-compressors, and controllers from the circuitfeeder." The disconnect switch should be selected and located within the NEC guidelines.Maximum recommended fuse sizes are given in the electrical data tables of this catalog forhelp in sizing the disconnect.

Terminals are provided in the unit control center for optional field hookup of the controlcircuit to a separate fused 115 volt power supply. A control circuit transformer is factoryinstalled to eliminate the requirement for a separate power supply to the control circuit.

Terminals are provided in the unit control center for field hookup of the evaporator heaterto either a separate 115 volt power supply or to control circuit power.

Remote Evaporator

GeneralThe multiple compressor ALS air-cooled chillers are available with remote evaporator.This allows the main unit to be installed outdoors to save interior room and eliminates theneed for anti-freeze solutions and heat tracing of chilled water lines since the chilled watersystem is indoors. There are some general guidelines to review before proceeding:

1. R-22 only.

2. Maximum line length of 50 ft (15 m) and Total Equivalent Length (TEL) of 120 ft(37 m).

3. Evaporator not more than 6 ft (1.8 m) above the compressor or 16 ft (5 m) belowcompressor.

4. No underground piping.

5. No hot gas bypass.

6. Units with remote evaporator are not included in the ARI Certification Program.

The remote evaporator is shipped separately, ready for quick and easy installation at the jobsite. All refrigerant accessories such as liquid-vapor line shut-off valves, replaceable corefilter-driers, liquid line solenoid valves, electronic expansion valves, and sightglasses arealready included on the ALS condensing unit. The evaporator is equipped with entering


and leaving chilled water temperature sensor wells. The sensors are pre-wired to the ALSunit with 75 feet long sensor leads that must be field connected to the evaporatorthermowells. Suction pressure transducers and temperature sensors must also be relocatedto the evaporator. ALS units are shipped with an operating charge of refrigerant. Fieldpiping must be leak tested, evacuated and charged during installation. Do not exceed 150psig test pressure unless the unit is blanked off from the piping. Severe equipment damageor personal injury can result.

Performance Derate FactorsAll performance tables and adjustment factors found in this catalog are applicable forremote evaporator installations, however, a performance derate must be applied to the R-22performance data due to additional pressure drops in the suction and liquid lines whichcause a loss of compressor performance. These derates are based on a suction line pressuredrop equivalent of approximately 2°F (1°C) change in saturation temperature.

For R-22 applications:

Capacity = Tons (kW) x 0.97

Power = Compressor kW x 0.99

Refrigerant Line SizesGeneralCareful design of the refrigerant piping is necessary for efficient system operation. Therefrigerant piping should be designed for a low pressure drop to obtain maximum capacityand efficiency while maintaining adequate velocity. Lines should slope in the direction offlow to provide good oil return to the compressors. Cost considerations favor keeping linesizes as small as possible while not exceeding acceptable pressure drops in order tomaintain unit performance.

NOTEAll refrigerant piping must be reviewed by McQuay Application Engineers

prior to order entry and will be verified by McQuay startup technicians.

Suction line sizing

Pressure drop in the suction line reduces system capacity and efficiency because it forcesthe compressor to operate at lower suction pressure. The suction line should be sized for apressure drop approximately equivalent of 2°F (1°C) change in saturation temperature. Forsuction line sizing see Table 19 through Table 21. For applications with the evaporatorbelow the ALS unit, the vertical section of the suction lines must be sized to return oil tothe compressors at the minimum compressor capacity step.

Example of Suction Line Size Calculation

ALS 150C condensing unit with refrigerant R-22

Evaporator located 5 feet below the ALS compressor

Lineal length of horizontal suction line is 25 feet

Suction line requires 7 long radius (90°) elbows; 3 in the horizontal, 4 in the riser


From Table 19, the nominal circuit capacities for circuit 1 and 2 are 65 and 80 tonsrespectively

Total lineal suction line length = 30 feet each circuit (25 feet horizontal plus 5 feetvertical riser). For the first try, assume that the total equivalent suction line length istwice the lineal suction line length.

Therefore the estimated total equivalent suction line length = 60 feet

From Table 20 and Table 21, For nominal circuit capacities of 65 & 80 tons and equivalentline length of 60 ft, the suction line size = 2 5/8" for horizontal lines and 2 1/8" forvertical lines.

From Table 24, Fitting loss for 2 5/8" long radius (90°) elbow = 4.1 ft, and 3.3 ft for the 21/8 elbows.

Therefore fitting loss in equivalent feet of pipe for (3) 2 5/8" long radius (90°) elbow =12.3 ft, and 13.2 ft for (4) 2 1/8" elbows.

Therefore the actual equivalent suction line length = 30 + 12.3 + 13.2 = 55.5 feet

From Table 20 and Table 21, For nominal circuit capacities of 65 & 80 tons and equivalentline length of 55.5 ft the suction line size is correct.

Table 19, ALS 141C-420C Nominal Circuit Capacities

ALS Model Circuit 1Tons (kW)

Circuit 2Tons (kW)

141C 65 (229) 65 (229)150C 65 (229) 80 (262)171C 80 (262) 80 (262)186C 80 (262) 95 (334)190C 80 (262) 95 (334)200C 95 (334) 95 (334)206C 95 (334) 95 (334)218C 95 (334) 95 (334)

Table 20, Vertical Upflow Suction Line SizesVertical Upflow Suction LinesNominal Circuit

CapacityTons (kW) Equivalent Line Length Ft (m) Suction Line Size (in.)

40 (12) 2 1/865 (229) 75 (23) 2 1/840 (12) 2 1/880 (262) 75 (23) 2 1/840 (12) 2 5/895 (334) 75 (23) 2 5/8

Table 21, Horizontal and Vertical Downflow Suction Line SizesVertical Downflow and Horizontal Suction LinesNominal Circuit

CapacityTons (kW) Equivalent Line Length Ft (m) Suction Line Size, in.

40 (12) 2 5/865 (229) 75 (23) 2 5/8

115 (35) 2 5/840 (12) 2 5/8

80 (262) 75 (23) 2 5/8115 (35) 3 1/840 (12) 2 5/8

95 (334) 75 (23) 3 1/8115 (35) 3 1/8


Liquid-Vapor LinesThe liquid-vapor line from the ALS condensing unit to the evaporator liquid connection isnot a conventional liquid line since it carries both liquid and vapor. The compressors on theALS units utilize a liquid cooled motor and an economizer. Therefore, the expansion valvewhich feeds the full flow of liquid refrigerant into the compressor for motor cooling ismounted in the liquid line between the condenser sub-cooling coil and the compressor inlet;not at the evaporator inlet. The liquid-vapor line to the evaporator is a low pressure linedownstream of the expansion valve and the size is slightly larger than a normal liquid line.For liquid line sizing see Table 22 and Table 23.

Table 22, Vertical Upflow Liquid-Vapor Line SizesVertical Upflow Liquid-Vapor LinesNominal Circuit

CapacityTons (kW)

Equivalent Line LengthFt (m)

Liquid-Vapor Line Sizeo.d (in.)

40 (12) 1 3/865 (229) 75 (23) 1 3/840 (12) 1 3/880 (262) 75 (23) 1 3/840 (12) 1 5/895 (334) 75 (23) 1 5/8

Table 23, Horizontal and Vertical Downflow Liquid-Vapor Line SizesVertical Downflow and Horizontal Liquid-Vapor LinesNominal Circuit

CapacityTons (kW)

Equivalent Line LengthFt (m)

Liquid-Vapor Line Sizeo.d (in.)

40 (12) 1 3/865 (229) 75 (23) 1 3/8

115 (35) 1 3/840 (12) 1 3/8

80 (262) 75 (23) 1 5/8115 (35) 1 5/840 (12) 1 5/8

95 (334) 75 (23) 1 5/8115 (35) 1 5/8

InsulationAll piping joints and fittings must be thoroughly leak tested before insulation is applied.Suction lines must be insulated and should not be installed underground. Suction lineinsulation must be selected to prevent condensation under local ambient conditions with thelines at 40°F to 50°F (4.4°C to 10°C) operating temperatures. The liquid-vapor lines willoperate at 40°F to 60°F (4.4°C to 15.6°C) and must also be insulated to prevent sweatingand heat gain.

Location and ArrangementRefrigerant lines should be as short and direct as possible to minimize tubing and fittings.Long radius elbows must be used (except for traps) to minimize the pressure drops. Trapsshould be as short as possible to minimize oil accumulation. Refrigerant piping should bearranged so that normal inspection of the equipment is not hindered. Adequate clearanceshould be provided between refrigerant piping and adjacent walls for insulation. Pipingshould be run so that it does not interfere with compressor service access, passages orobstruct headroom, windows and doors. Suction line hangers must be sized and located tosupport the weight of the piping in accordance with good piping practice.

Horizontal portions of the suction lines must be downward sloping toward the compressors.Slope all piping in the direction of flow. Vertical portions of the suction lines must be sizedfor oil return at minimum compressor load.


Note: Double section risers must not be utilized on any circuit. Traps must be provided asshown on Figure 24 and Figure 25.

Table 24, Fitting Equivalent Feet of PipeLine Size (in.) Angle Valve Globe Valve 90° Std. Radius Elbow 90° Long Radius Elbow

1 1/8 12 29 2.6 1.71 3/8 15 38 3.3 2.31 5/8 18 43 4.0 2.62 1/8 24 55 5.0 3.32 5/8 29 69 6.0 4.13 1/8 35 84 7.5 5.0

Equivalent Line LengthsRecommended refrigerant line sizes are based on equivalent line lengths of straight pipe,that is, a combination of straight pipe, fittings and valves. The pressure drop through valvesand fittings is determined by establishing the equivalent straight length of pipe of the samesize with the same friction loss. The "Total Equivalent Length" is the sum of the "LinealLine Length" and the appropriate "Valve and Fitting Losses in Equivalent Feet of Pipe forField Supplied Piping" given in Table 24.

Figure 24, Evaporator Above ALS Unit

Figure 25, Evaporator Below ALS Unit

NOTE: Keep the trap width at a minimum to avoid trapping excessive oil.

Startup ProceduresNOTE: McQuayService or an authorized McQuay service agent must do initial start-up andcommissioning.

Filter DriersFollowing an initial 24 hour operation the pressure drop across the replaceable core, filterdrier should be checked. If this pressure drop exceeds the values given in Table 25 at thevarious load conditions the filter drier cores must be replaced. Also, if the moistureindicating sight glass shows a wet system condition after 24 hours of operation the filtercores must be changed. This should remove any contaminants introduced during field


piping. The filter drier cores must also be changed anytime the system is opened forservicing.

Table 25, Filter Drier Pressure DropPercent Circuit

Loading (%)Maximum Recommended Pressure Drop Across Filter Drier

psig (kPa)100 10 (69.0)75 8 (55.2)50 5 (34.5)25 4 (27.6)

Refrigerant and Oil ChargeThe relative position of the ALS unit and the evaporator and the distance between themplays a critical role in determining suction and liquid line sizes and the field refrigerant andoil charges. ALS units with the remote evaporator are shipped with an operating charge ofrefrigerant and oil. It will be necessary to evacuate the evaporator and field installed linesand field charge them. See Table 26 for refrigerant charge for suction and liquid-vaporlines. McQuay Service will supply and add additional oil as required. The correct oil isPlanetelf ACD68AW, McQuay Part No. 735030439 (5 gal.), or 735030438 (1 gal.).

Charging Procedure

The calculated refrigerant and oil charge must be added through the factory suppliedcharging valve located on the liquid-vapor line coming out of the compressor. Sufficientcharge must be added to clear the liquid line sight glass located at the outlet of thecondenser. Add an extra 10 lb. of refrigerant after the sight glass is clear. Note: Chargemust never be added through the compressor suction line. Severe equipment damage canresult.

Table 26, Refrigerant Charge for Suction and Liquid-Vapor LinesSuction Line Refrigerant Charge

lb (kg)Liquid-Vapor Line Refrigerant Charge

lb (kg)Lineal Tubing

LengthFt (m) Line (in.) R-22 Line (in.) R-22

2 1/8 0.33 (0.15) 1 3/8 3.6 (1.6)10 (3) 2 5/8 0.51 (0.23) 1 5/8 5.0 (2.3)

3 1/8 0.71 (0.32)2 1/8 0.66 (0.30) 1 3/8 7.2 (3.3)

20 (6) 2 5/8 1.02 (0.46) 1 5/8 10.0 (4.5)3 1/8 1.42 (0.64)2 1/8 0.99 (0.45) 1 3/8 10.8 (4.9)

30 (9) 2 5/8 1.53 (0.69) 1 5/8 15.0 (6.8)3 1/8 2.13 (0.96)2 1/8 1.32 (0.60) 1 3/8 14.4 (6.5)

40 (12) 2 5/8 2.04 (0.92) 1 5/8 20.0 (9.0)3 1/8 2.84 (1.29)

Oil Charge

The oil charge is 3 gallons of oil per circuit.

Notes:

1. The only approved oil is that identified on the label attached to the compressors. AllPOE oils are hygroscopic and care must be exercised in handling the oil to avoidabsorption and retention of moisture.

2. Do not leave the oil container open for more than a minute while charging oil. Do notuse oil that has not been properly sealed and stored.


DimensionsUse the ALS dimension drawings (Figure 8) for the ALS with remote evaporator. Therefrigerant connections are located approximately where the refrigerant connections to theunit mounted evaporator are on a packaged chiller. The remote evaporator dimensions areFigure 26 and Figure 27.


Dimensions, Remote EvaporatorFigure 26, Evaporator for ALS 141 - ALS 200

INLETOUTLET

Unit Weights lb. (kg)R-22 Operating Charge

lb. (kg)ALSModel

EvaporatorModel

WaterVolumegal. (l)

RefrigerantVolumecu.ft. (l) Operating Shipping Circuit 1 Circuit 2

141 CDE350332801 34 (128) 1.4 (40.0) 934 (424) 635 (288) 34 (15.4) 34 (15.4)150-200 CDE350332901 40 (150) 1.8 (52.4) 1127 (512) 758 (343) 45 (20.4) 45 (20.4)

Overall Dimensions in. (mm)ALSModel Length "K" Height "A" "B" "C" "D" "H" "J"

Conn."G"

141 94.6 (2403) 17.8 (452) 11.0 (279) 10.2 (259) 12.8 (325) 6.4 (163) 85.2 (2164) 5 (152)150-200 95.5 (2426) 18.4 (467) 12.0 (305) 10.2 (259) 14.0 (356) 6.8 (173) 84.0 (2134) 8 (203)


Figure 27, Evaporator for ALS 206 - ALS 218

INLETOUTLET

152

Weights lb. (kg) R-22 Opn Charge lb. (kg)ALSModel

EvaporatorModel

Water Volumegal. (l)

Refrig Volumecu. ft. (l) Operating Shipping Circuit 1 Circuit 2

206 CDE350281651 55 (208) 2.4 (67.9) 1464 (665) 943 (428) 57 (25.8) 57 (25.8)218 CDE350282101 98 (373) 2.8 (79.2) 2028 (921) 1121 (509) 68 (30.9) 68 (30.9)

ALS Dimensional DataModel A C D H J K

206 21.3 (542) 12.1 (307) 16.0 (406) 6.9 (176) 84.5 (2149) 96.7 (2459)218 23.6 (601) 12.4 (315) 20.0 (508) 9.2 (235) 86.6 (2202) 99.7 (2533)


Standard Features

Full Factory TestingFactory run tests with water hookups on all units prior to shipment help provide a troublefree start-up. Each unit is pressure tested, evacuated, and charged with a full operatingcharge of refrigerant and oil. McQuay does quality control checks and individual unit testsso that all controls are properly adjusted and operating correctly. Job site start-up andexpenses are kept to a minimum as the unit is shipped ready to operate.

RiggingDesigned for easy handling and low installation costs, the ALS air-cooled screw chillers areassembled on a rugged galvanized steel channel base. The channel base distributes the unitweight for uniform low roof loading. Lifting holes are provided in the base of the unit tosimplify installation. See dimension drawing for location.

Cabinet ConstructionThe unit casing and all structural members and rails are fabricated of continuous G90galvanized steel and galvanized steel channel. The galvanized coating is applied to the basemetal by the hot dip process and conforms to standard ASTM A525. The exterior casing isphosphatized and painted with a beige powder coated finish and passes the ASTM B117500 hour salt spray test.

CompressorsAll units feature multiple compressors with independent refrigerant circuits. Thecompressor is a direct drive, 3600 rpm, single-screw type with one main rotor that mesheswith two diametrically opposed gaterotors. The two exactly opposed gaterotors create twoexactly opposed compression cycles resulting in a well balanced compression cycle.

The compressor has an internal economizer to enhance the unit's refrigeration effect and toallow the compressor to run at a more efficient operating point. During the economizercycle vapor produced at the electronic expansion valve and motor cooling process isredirected to the rotor inlet, while the remaining liquid refrigerant flows to the evaporator.

The electric motor is semi-hermetic, squirrel cage induction type and cooled by liquidrefrigerant. This allows the motor to operate at lower temperatures enhancing systemreliability and motor life when compared to suction gas cooled motors found onreciprocating and twin-screw compressors.

Each compressor is equipped with suction and discharge service shutoff valves.

EvaporatorThe evaporator is a direct expansion, shell-and-tube type with water flowing in the baffledshell and refrigerant flowing through the tubes. Independent refrigerant circuits within theevaporator serve each compressor.

The evaporator is constructed with a carbon steel shell and seamless high efficiency coppertubes. Roll expansion anchors the refrigerant tubes in the heavy carbon steel tube sheets.

Refrigerant heads are constructed of carbon steel and are removable to permit access to thetubes from either end. For easy draining and venting of the shell, 3/8 inch vent and drainplugs are provided on the top and bottom of the shell.

The evaporator is wrapped with an electric resistance heater cable and insulated with 3/4inch thick vinyl nitrate polymer sheet insulation to provide freeze protection down to -20°F(-29°C) ambient air temperature. An ambient thermostat controls the heater cable.


(Note: A water flow switch must be field installed to protect against evaporator freeze-upunder low water flow conditions.)

The evaporator insulation has a K factor of 0.28 at 75°F (24°C). The insulation is fitted andcemented in place, then painted with a resilient vinyl base paint to resist cracking.

The tube side maximum working pressure is 300 psi (2068 kPa). The water side workingpressure is 152 psi (1048 kPa). All evaporators are designed, constructed, inspected andstamped in accordance with the requirements of the ASME Boiler and Pressure VesselCode.

Condenser Fans and MotorsMultiple direct-drive propeller fans operate in formed bell shaped orifices at low tip speedsfor maximum static efficiency and minimum noise and vibration. Each fan is protected by aheavy-gauge, close meshed, PVC coated fan guard and is positioned within the unit cabinetfor maximum protection against the elements.

A heavy-duty, 3-phase motor with permanently lubricated ball bearings and inherentoverload protection drives each condenser fan. Factory fusing provides positive protectionfrom short circuiting.

Condenser CoilsThe condenser coils are constructed with internally enhanced seamless copper tubesarranged in a staggered row pattern and mechanically expanded into McQuay lanced andrippled aluminum fins with full fin collars. The fins have full drawn collars to completelycover the copper tube for protection against atmospheric corrosion and provide excellentheat transfer. An integral subcooler with a liquid sightglass on the inlet provides sufficientsubcooling to effectively eliminate the possibility of liquid flashing and increase unitefficiency. Standard PVC coated wire mesh guards protect the coils.

Control CenterThe ALS screw chiller is shipped with all operating and equipment protection controls,control transformer and solid state motor starting and protection equipment, all factorywired, operationally tested, and ready for service. Included are:

Controlled acceleration Electronic thermal overload Stalled motor protectionControlled deceleration Over/under current protection Single phase protectionPhase rotation protection Current unbalance protection High load current

All controls are centrally located in a weather-resistant, hinged control center, with key-locked doors to prevent unauthorized entry. Panel access doors include steel rod doorretainers to prevent flapping while open. Dead front panels help protect service personnelfrom accidental contact with line voltage components.

Power ConnectionsStandard power connection is to a single power block except for 208/230 volts on modelALS 245C and larger that have multipoint connection as standard (single point notavailable). Various options are available.


Optional Features

ControlsLow ambient head pressure controlOptional SpeedTrol head pressure control permits unit operation down to 0°F (-18°C)ambient. However, since the actual minimum ambient can be dependent on windconditions, wind baffles are also available.

Under/over voltage protectionPhone modem(Part Number 0072140601) An optional 9600 baud modem interface is available whichallows the operator to control (or monitor) all chiller operations from a remote locationthrough standard phone lines.

Ice storageThe unit is equipped with control logic to handle the low temperatures associated withthermal storage applications. They are also supplied with additional evaporator insulation.

Water flow switch(Part Number 01750330) A water flow switch is available for field installation in the chilledwater piping to protect against evaporator freeze-up under low or no flow conditions.Terminals are provided in the unit control center for field hook up of the water flowdetection switch.

ElectricalMultipoint power blocksAvailable on all units.

Disconnect switch(s)A single point factory installed nonfused disconnect switch with through-the-door handle isavailable on all units.

Multiple point factory installed disconnect switches are available on all units.

Disconnect switches are available for field mounting. Through-the-door handles areoptional and require cutting of the door in the field.

Circuit BreakersCircuit breakers are available on all single point power connection arrangements.

Totally enclosed fan cooled condenser fan motorsTEFC condenser fan motors are available as an option in lieu of the standard open drip-proof (ODP) fan motors when required by the application. When low ambient SpeedTrol isordered the number 1 condenser fan motor on each refrigerant circuit will still be open drip-proof. TEFC motors is standard on model ALS 218C.

Unit amps sensor packageA unit amp sensor package can be provided which will display the percent of total unit ampdraw at any given time.


115 volt convenience outletA 10.0 amp, 115 volt convenience outlet mounted inside the control panel is available as anoption on all units.

Ground fault protectionA ground fault interrupter can be provided to shut down the entire unit if a ground faultcondition is sensed.

UnitBlack Fin coilAluminum fin stock is precoated with a phenolic epoxy coating with 1000 hour salt sprayresistance (ASTM B117-90).

Copper fin condenser coilsCopper fin condenser coils are available as an option on all models.

Baked epoxy condenser fin coatingElectro Fin flexible dip and baked epoxy protective coating with 3000+ hour salt sprayresistance (ASTM B117-90) is available on the condenser coils and coil frames. Providesprotection against adverse environments such as salt air as found on sea coast applicationsand many chemical environments. Consult the local McQuay sales office for completespecification and chemical resistance chart.

Protective base guardsOptional factory installed wire mesh lower base guards provide protection for ground levelinstallations. Coil guards are standard.

Wind baffles/hail guardThe presence of wind will have an adverse affect on any air-cooled chiller. Wind across acondenser coil will not allow a chiller to operate as efficiently, or possibly not even start, atlow ambient temperatures. Wind in effect raises the minimum ambient temperature inwhich the chiller can operate. The ALS air-cooled chillers are available with field installedwind baffles which allow the chiller to operate effectively down to the ambient temperaturefor which it was designed.

Hail can have a damaging effect on the performance of an air-cooled condenser. As thefinned area is flattened against the coil, restricting airflow, the efficiency of the coil isreduced.

If desired, the wind/hail guards can be purchased for only one side of a unit in cases wherean adjacent wall provides protection.

Vibration isolatorsSpring vibration isolators are available for field installation under the unit base frame onsound sensitive applications. Consult the local McQuay sales office for seismic isolation.


Specifications

The specification is available in MSWord from the local McQuay sales office.SECTION 15XXX

AIR-COOLED ROTARY SCREW CHILLERSPART 1 - GENERAL

1.01 SUMMARY

Section includes design, performance criteria, refrigerants, controls, and installation

requirements for air-cooled rotary screw packaged chillers

1.02 REFERENCES

Comply with applicable Standards/Codes of ARI 590, ANSI/ASHRAE 15, and

ASME Section VIII.

1.03 SUBMITTALS

A. Submit shop drawings and product data in accordance with specification

requirements.

B. Submittals shall include the following:

1. Dimensioned plan and elevation view drawings, required

clearances, and location of all field connections.

2. Summary of all auxiliary utility requirements such as electricity,

water, compressed air, etc. Summary shall indicate quality and

quantity of each required utility.

3. Single line schematic drawing of the power field hookup

requirements, indicating all items that are furnished.

4. Schematic diagram of control system indicating points for field

connection. Diagram shall fully delineate field and factory wiring.

5. Certification of factory run test of chiller unit signed by company

officer.

6. Installation manuals.

1.04 QUALITY ASSURANCE

A. Qualifications; Equipment manufacturer must specialize in the manufacture

of the products specified and have five years experience with the

equipment and refrigerant offered.

B. Regulatory Requirements: Comply with the codes and standards specified.

C. Chiller manufacturer must be ISO registered.


1.05 DELIVERY AND HANDLING

A. Chillers shall be delivered to the job site completely assembled and charged

with refrigerant and oil by the manufacturer.

B. Comply with the manufacturers instructions for rigging and handling

equipment.

1.06 WARRANTY

The refrigeration equipment manufacturer’s warranty shall be for a period of one

year from date of equipment start up but not more than 18 months from shipment.

It shall cover defects in material and workmanship having proven defective within

the above period.

PART 2--PRODUCTS

2.01 ACCEPTABLE MANUFACTURERS

A. McQuay International

B. (Approved Equal)

2.02 UNIT DESCRIPTION

Provide and install as shown on the plans factory assembled, factory charged, and

factory run tested air-cooled rotary screw compressor packaged chillers in the

quantity specified. Each chiller shall consist of multiple semi-hermetic rotary

screw compressors, direct expansion evaporator, air-cooled condenser section,

control system and all components necessary for safe and controlled unit operation.

2.03 DESIGN REQUIREMENTS

A. General: Provide a complete rotary screw packaged chiller as specified

herein and as shown on the drawings. The unit shall be in accordance with

the standards referenced in section 1.02 and any local codes in effect.

B. Performance: Refer to the schedule of performance on the drawings. The

chiller shall be capable of stable operation to a minimum of 12.5 percent of

full load without hot gas bypass. The unit shall be capable of operating to

40°F (4.4°C) or 0°F (-18°F) ambient if the low ambient option is specified.

Performance shall be in accordance with ARI Standard 550/590-98.

C. Acoustics: Sound pressure levels for the units shall meet or be lower than

_____dBA on the overall “A” weighted sound pressure level.

Measurements to be taken at full load at a distance of 30 feet (9.14 meters)

from the side of the unit.


2.04 CHILLER COMPONENTS

A. Compressors: The compressors shall be field serviceable, semi-hermetic,

single-screw type with one main helical rotor meshing with two opposed

gaterotors. If a twin-screw compressor is used, the manufacturer shall

provide an extended 5-year parts and labor warranty covering all moving

parts due to the large bearing loads inherent with this design. The

gaterotors’ contact elements shall be constructed of a composite material

designed for extended life.

Electric motors shall be two pole, semi-hermetic, squirrel cage induction

type and cooled by circulating liquid refrigerant. Suction gas cooled

designs shall include an extended 5-year compressor warranty including

parts and labor. Full load power factor shall be a minimum of 0.90.

The compressor shall be provided with an internal economizer cycle to

improve system efficiency by subcooling the refrigerant flowing to the

evaporator. Units without an internal compressor economizer shall be

equipped with an external economizer of the flash type to provide an

equivalent degree of subcooling.

B. Evaporator: The evaporator shall be direct expansion type with carbon steel

shell, water baffles, and high efficiency internally finned copper tubes

rolled into a steel tubesheet. The evaporator shall be insulated with 3/4

inch (19mm) closed cell polyurethane insulation and heated with an electric

heater to provide freeze protection to -20°F (-29°C) ambient temperature.

The evaporator shall be designed, inspected, and stamped in accordance

with ASME Section VIII requirements.

C. Condenser: The condenser coils shall have seamless copper tubes

mechanically bonded into plate type fins. The fins shall have full drawn

collars to completely cover the tubes. A subcooling coil shall be an

integral part of the main condenser coil. Condenser fans shall be propeller

type arranged for vertical air discharge and individually driven by direct

drive fan motors. Each fan shall be in its own compartment to eliminate

cross flow of condenser air during fan cycling and shall be equipped with a

heavy-gauge fan guard. Fan motors shall be weather protected, three-


phase, direct-drive, 1140 rpm, open drip-proof type. Coils shall be

protected by a vinyl coated, wire mesh guard.

D. Refrigerant Circuit: The unit must have refrigerant circuits completely

independent of each other with one compressor per circuit. Each circuit

shall include an electronic expansion valve, compressor suction and

discharge shutoff valves, a liquid line shutoff valve, replaceable core filter-

drier, sight glass with moisture indicator, liquid line solenoid valve (no

exceptions), and insulated suction line.

E. Unit casing and all structural members and rails shall be fabricated of

continuous G90 galvanized steel and meet ASTM B117 500 hour salt spray

test. The galvanized coating shall be applied to the base metal by the hot

dip process and shall conform to ASTM A525. The control enclosure and

unit panels shall be powder coat painted before assembly.

F. The compressor starters shall be solid state and contain, at least, the

following functions: controlled acceleration and deceleration, phase

rotation protection, electronic thermal overload, over/under current

protection, stalled motor protection, single phase protection, high load

current, and current unbalance protection.

G. Microprocessor based control system: A weatherproof control panel shall

contain the field power connection points, control interlock terminals, and

control system. Power and starting components shall include factory fusing

of fan motors and control circuit; individual contactors for each fan motor,

inherent fan motor overload protection and unit power terminal blocks for

connection to remote disconnect switch. Terminals shall also be provided

for power supply to the evaporator heater circuit. Hinged access doors

shall be lockable. Barrier panels are required to protect against accidental

contact with line voltage when accessing the control system.

The system shall stage the unit based on the leaving water temperature.

Safeties controlled by the microprocessor include motor protection, high

discharge pressure, loss of refrigerant, loss of water flow, freeze protection,

and low refrigerant pressure. Controls shall include auto/stop switch,

chilled water setpoint adjustment, anti-recycle timer, and digital display

with water temperature and setpoint, operating temperatures and pressures,

and diagnostic messages. The following features and functions shall be

included:


1. The LCD type display shall have a minimum of 32 characters with

all messages in English. Units of measure will be I-P. Coded

messages and LED displays are not acceptable.

2. Critical parameters shall have their own section of control and be

password protected.

3. Resetting chilled water temperature by either controlling the return

water temperature or by a remote 4-20mA DC signal.

4. A soft load function to prevent the system from operating at full

load during the chilled fluid pulldown period.

5. An electronic time clock to allow programming of a yearly start-

stop schedule accommodating weekends and holidays.

6. Auto restart after a power failure without an external battery back-

up or auxiliary power for maintaining program memory.

7. Safety shutdowns shall be date and time stamped with system

temperatures and pressures recorded. A minimum of six previous

occurrences shall be kept in a revolving memory.

8. Start-to-start and stop-to-start timers to provide minimum

compressor off-time with maximum motor protection.

9. Capability of communication with a PC or remote monitoring

through a twisted pair RS-232 interface.

10. Lead-lag by manual selection or automatically by circuit run hours.

11. Discharge pressure control through intelligent cycling of condenser

fans.

12. Pro-active compressor unloading in response to high discharge

pressure or low evaporator pressure.

13. Continuous diagnostic checks of unit operation to provide a pre-

alarm signal in advance of a shutdown allowing time for remedial

action to be taken.


2.05 OPTIONS AND ACCESSORIES

The following options are to be included:

• Nonfused service disconnect switch, factory mounted

• Ground fault protection, factory installed

• Low ambient head pressure control to 0°F (18°C), factory mounted

• Copper fin condenser coils

• Baked epoxy condenser coating

• Black fin - precoated fin option

• Totally enclosed air-over condenser fan motors

• Chilled water flow switch to be field mounted by contractor in the chilled water

line and field wired to terminals in the control panel.

• Spring vibration isolators for field installation

• Protective welded wire lower base guards on compressor section

• 115 volt convenience outlet mounted in control panel

• Wind baffles and hail guards for field installation by installing contractor

PART 3 - EXECUTION

3.01 INSTALLATION

A. Install in strict accordance with manufacturer’s requirements, shop

drawings, and contract documents.

B. Adjust and level chiller in alignment on supports.

C. Coordinate electrical installation with electrical contractor.

D. Coordinate controls with control contractor.

E. Provide all appurtenances required to insure a fully operational and

functional chiller.

3.02 START-UP

A. Provide proper charge of refrigerant and oil.

B. Provide Authorized Factory starting of chillers, and instruction to the

owner on proper operation and maintenance.

Post Office Box 2510, Staunton, Virginia 24402-2510 USA • (800) 432-1342 • www.mcquay.com

Documents

Air-Cooled Rotary Screw Chillers - Daikin Applied