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INSTALLATION MANUAL SAVE THIS MANUAL INSTALLATION & OPERATING INSTRUCTIONS FOR D2SK036 - D2SK300 VERTICAL AIR CONDITIONING UNITS 036-21540-001-A-0503 D2SK036-300 EMBASSY SERIES CONTENTS GENERAL INFORMATION . . . . . . . . . . . . . . . . . . 3 PRE-INSTALLATION INSPECTION OF EQUIPMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 UNIT MOUNTING . . . . . . . . . . . . . . . . . . . . . . . . . .5 OUTDOOR AIR DUCTWORK . . . . . . . . . . . . . . . .12 EVAPORATOR BLOWER DISCHARGE CONVERSION . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 BLOWER SPEED ADJUSTMENT . . . . . . . . . . . . 17 LOW AMBIENT DAMPER INSTALLATION. . . . . 18 START-UP AND OPERATION . . . . . . . . . . . . . . . 19 MAINTENANCE / SERVICE . . . . . . . . . . . . . . . .20 See the following page for a complete Table of Contents. NOTES, CAUTIONS AND WARNINGS The installer should pay particular attention to the words: NOTE, CAUTION, and WARNING . Notes are intended to clarify or make the installation easier. Cautions are given to prevent equipment damage. Warnings are given to alert installer that personal injury and/or equipment damage may result if installa- tion procedure is not handled properly. CAUTION: READ ALL SAFETY GUIDES BEFORE

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INSTALLATION MANUAL

SAVE THIS MANUAL

INSTALLATION & OPERATING INSTRUCTIONSFOR D2SK036 - D2SK300

VERTICAL AIR CONDITIONING UNITS

036-21540-001-A-0503

D2SK036-300EMBASSY SERIES

CONTENTSGENERAL INFORMATION . . . . . . . . . . . . . . . . . . 3

PRE-INSTALLATION INSPECTIONOF EQUIPMENT. . . . . . . . . . . . . . . . . . . . . . . . . . . 5

INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

UNIT MOUNTING . . . . . . . . . . . . . . . . . . . . . . . . . .5

OUTDOOR AIR DUCTWORK . . . . . . . . . . . . . . . .12

EVAPORATOR BLOWER DISCHARGE CONVERSION . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

BLOWER SPEED ADJUSTMENT . . . . . . . . . . . . 17

LOW AMBIENT DAMPER INSTALLATION. . . . . 18

START-UP AND OPERATION. . . . . . . . . . . . . . . 19

MAINTENANCE / SERVICE . . . . . . . . . . . . . . . .20

See the following page for a complete Table of Contents.

NOTES, CAUTIONS AND WARNINGS

The installer should pay particular attention to thewords: NOTE, CAUTION, and WARNING. Notes areintended to clarify or make the installation easier.Cautions are given to prevent equipment damage.Warnings are given to alert installer that personalinjury and/or equipment damage may result if installa-tion procedure is not handled properly.

CAUTION: READ ALL SAFETY GUIDES BEFORE

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TABLE OF CONTENTS

GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . 3

PRE-INSTALLATION INSPECTIONOF EQUIPMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

RIGGING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

UNIT MOUNTING . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

OUTDOOR AIR DUCTWORK . . . . . . . . . . . . . . . . . 12

LOUVER SIZING GUIDELINES . . . . . . . . . . . . . . 12

EVAPORATOR BLOWER DISCHARGE CONVERSION . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

BLOWER SPEED ADJUSTMENT . . . . . . . . . . . . . 17

LOW AMBIENT DAMPER INSTALLATION . . . . . . 18

START-UP AND OPERATION . . . . . . . . . . . . . . . . 19

MAINTENANCE / SERVICE . . . . . . . . . . . . . . . . . 20

FILTERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

EVAPORATOR AND CONDENSER COILS . . . . . 20

BLOWERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

DRIVE BELTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

REFRIGERANT CIRCUIT (S) . . . . . . . . . . . . . . . . 20

LIST OF FIGURES

Fig. # Pg. #

1 DSK TYPICAL APPLICATIONS. . . . . . . . . . . . . . . . . . 42 3/4/5 TON UNITS - DIMENSIONAL DATA &

CORNER WEIGHTS . . . . . . . . . . . . . . . . . . . . . . . . . . 73 8/10 TON UNITS - DIMENSIONAL DATA &

CORNER WEIGHTS . . . . . . . . . . . . . . . . . . . . . . . . . . . 84 12/15 TON UNITS - DIMENSIONAL DATA &

CORNER WEIGHTS 95 20 TON UNIT - DIMENSIONAL DATA &

CORNER WEIGHTS . . . . . . . . . . . . . . . . . . . . . . . . . 106 25 TON UNIT - DIMENSIONAL DATA &

CORNER WEIGHTS . . . . . . . . . . . . . . . . . . . . . . . . . 117 HORIZONTAL AND STANDARD VERTICAL

DISCHARGE CONVERSION 138 TYPICAL WIRING DIAGRAM . . . . . . . . . . . . . . . . . . 149 LOW AMBIENT DAMPER INSTALLATION . . . . . . . . 18

LIST OF TABLES

Tbl. # Pg. #

1 ELECTRICAL DATA - EVAPORATOR MOTORS 15

2 SUPPLY FAN PERFORMANCE DATA . . . . . . . . . . . 163 CONDENSER AIR BLOWER PERFORMANCE . . . . 164 MOTOR AND PULLEY DATA . . . . . . . . . . . . . . . . . . 175 REFRIGERANT CHARGE . . . . . . . . . . . . . . . . . . . . . 196 PRESSURE SWITCH SETTINGS . . . . . . . . . . . . . . . 19

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GENERAL INFORMATION

Our units are designed to meet the ever-changing(unique) installation requirements of today's market. Allmodels 3 to 15 tons are shipped as factory-chargedunitized packages. The 20 and 25 ton models areshipped as separate condensing unit and evaporatorsection modules. These units are designed to alloweasy passage through doors, hallways and elevators.All models are designed for freestanding mounting onthe floor, or on a field fabricated structural steel stand.All unit components are securely mounted inside theheavy gauge "Galvalume" steel cabinet. All units arelined with 1/2" thick - 2 lb. density acoustical insulationto ensure the quietest operation. All models are pro-vided with medium-efficiency 2" thick throwaway filters.The 3, 4, 5, 8, and 10 ton models are shipped with ver-tical evaporator fan discharge as standard. The 12, 15,20 and 25 ton models are shipped with horizontal fandischarge as standard. The evaporator fan dischargeconfiguration is field convertible on all units.

The 3, 4, 5 ton models have a single refrigerant circuit.The 8 through 20 ton models are dual compressor unitswith two independent refrigerant circuits. The 25 tonunit features three independent refrigeration circuits.Evaporator and condenser coils are of copper tube andrippled aluminum plate fin construction. All models areequipped with an adjustable thermal expansion valve(with external equalizer), one valve per circuit. Eachrefrigerant circuit is also equipped with a liquid line filterdrier, sight glass/moisture indicator, and service accessports. The 20 and 25 ton models require field connec-tion and charging of the refrigerant circuits. The 20 and25 ton models are shipped with a nitrogen holdingcharge only.

High efficiency Scroll compressors are used in all mod-els mounted on durable rubber isolator pads to reducevibration and noise while operating. Each refrigerantcircuit is equipped with high pressure and low-pressureswitches. An electrically re-settable lockout relay willshut off the compressor in the event of pressure switchtrip during operation. Control circuit operates on 24V,and features an oversized transformer. Optional anti-short circuit timers can be field/factory installed.

Installation time is minimized with all models. Whenplanning an installation consider power supply, thermo-stat, condensate drain line, duct run, and service clear-ances. A remote thermostat device is field supplied andinstalled to control the unit operation. Attachments tothe unit include the bolt-on filter frame, factory suppliedduct flanges, and an optional hydronic heating coil.

Service access doors are equipped with lifting handles,and are located on all sides of the unit to allow easyservicing of all components. The compressor accessdoor is supplied with knockouts allowing gauge lines tobe installed and readings to be taken with the machinein operation. In addition there are removable viewingports to allow observation of the sight glass withoutremoving the access door.

All units are equipped with centrifugal blowers com-bined with variable pitch adjustable pulleys. Forwardcurved double width, double inlet blowers are used forboth condenser and evaporator air movement. All mod-els employ a draw-through air flow arrangement. Largeevaporator and condenser coil face areas reduce noiselevels, air pressure drops, and minimize potential con-densate blow-off. All blower wheels are galvanizedsteel, with solid steel shafts supported in permanentlylubricated ball bearings. V-belts drive all models andblower RPM can be adjusted through the motorsheave.

Units will operate reliably at outdoor ambient down to60°F. In applications requiring operation below thistemperature, a low ambient damper accessory is avail-able. The damper installs on the condenser air dis-charge, and allows operation to 0°F ambient.

Only qualified personnel should perform installationand service of units.

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FIGURE 1 - DSK TYPICAL APPLICATIONS

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PRE-INSTALLATION INSPECTIONOF EQUIPMENT

All units are factory tested to ensure safe operation andquality assembly. Units are packaged and sealed onshipping skids and shipped in first class condition. Tornand broken packaging, scratched or dented panelsshould be reported to carrier immediately. Internalinspection of all units should be performed prior toinstallation. Remove all access doors and check forvisual defects that can occur during transport. Anyproblems found internally should be reported to carrierand manufacturer immediately. Refrigerant circuitshould be checked to ensure no leaks have occurredduring shipment. Install a gauge set to the high and lowpressure ports to confirm pressure has been main-tained and no leaks have occurred during shipment.Repair any damage prior to installation to ensure safeoperation.

NOTE: Record any unit damage on the Bill of Lading andreport to carrier and factory immediately. Shippingand handling damages are not warranty items.

RIGGING

To ensure safe installation of the unit when ceilingmount application is specified, estimate the approxi-mate center of gravity of the unit. The configuration ofinternal components for each unit is different andweight is unevenly distributed.

INSTALLATION

Location - To ensure unit operates at maximum effi-ciencies, choose a dry indoor area where the tempera-ture is controlled between 50°F and 115°F.Consideration of surrounding areas should be takenwhen choosing a location to install the unit. Commonvibration and sound levels associated with commercialequipment may be objectionable to people or equip-ment.

Refer to typical installation diagram (Figure 1).

Install thermostats, air supplies and returns so thateach unit will operate only on individual unit control. Toassure fast drainage of condensate run-off, unit can beslightly pitched in the same direction as drain pan out-let.

UNIT MOUNTING

The 3 through 15 ton models are shipped as a fullyassembled integral package. These units may be fieldsplit to allow for passage through doors, elevators, hall-ways, etc. The 20 and 25 ton models are shipped intwo pieces - a separate condensing unit and evapora-tor module - which are intended for assembly into afreestanding vertical package on site.

Flanges for all duct connections are shipped in the con-densing section of the unit for field installation. Ductflanges for evaporator return are incorporated into thefilter rack.

Prior to mounting unit, check individual unitweights (pages 7-11) and verify lifting capacity oflifting equipment exceeds weight of units by safemargins. Failure to do so may result in unit dam-age, personal injury or even death

Determine the actual center of gravity of the unitby performing a test lift. Lifting an unbalanced unitcan cause personal injury or even death.

Lock all electrical power supply switches in the offposition before installing the unit. Failure to discon-nect power supply may result in electrical shock oreven death.

Failure to allow adequate space between units mayresult in poor unit performance and possible unitfailure.

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Floor mounted units should be secured on a solid, levelpad or sturdy stand. The base of the unit should beapproximately 6 inches higher than the lower edge ofthe wall opening. This height will allow the condenserair ducts to be pitched away from the unit, offering pro-tection from rain water entering the base pan (refer totypical installation diagram on Page #4). The use of anisolating rubber sheet is recommended to reduce vibra-tion and noise transmission. Ensure that the entirebase is continuously supported - do not support unit atcorner points only! Unit may be pitched slightly toensure efficient drainage of condensate.

EVAPORATOR / CONDENSER SEPARATION - (Allmodels except 20 and 25 Ton)

• Reclaim the entire refrigerant charge from each compressor circuit.

• Disconnect the evaporator motor high voltage wires at contactor/overload "C4/OL4". Pull all wir-ing into the evaporator compartment. Remove bushing/clamp from routing hole for evaporator motor wiring.

• Cut and remove sections of all liquid and suction refrigerant lines. Make two cuts in each line, approximately 6 inches above and below the evap-orator floor/condenser roof. Use a tubing cutter only - do not use a hacksaw to cut refrigerant tub-ing!

• Remove the corner securing brackets from the out-side corners of the cabinet, at the joint line between the evaporator and condenser sections.

• Remove the evaporator section.

ASSEMBLY OF SPLIT UNITS - (All models)

• Place the condensing section in the required loca-tion.

• Carefully position the evaporator section atop the condensing section. Align all sides, the evaporator motor wire routing hole, and the refrigerant line routing holes.

• Install the securing brackets at all four corners, on the evaporator/condenser separation joint. Note that one bracket, intended for use at the corner with the drain fitting, has a short "leg".

• Use appropriate tubing couplings and splice previ-ously cut refrigerant lines. (On 20 and 25 Ton mod-els, remove spun end caps with a tubing cutter - after releasing nitrogen pressure at shraeder fit-tings. Short tubing sections and couplings are shipped with unit to connect refrigerant circuits).

• Pressure test refrigerant circuits with dry nitrogen (300 psig ).

• Evacuate each circuit to at least 350 microns. If gauge pressure rises above 500 microns in one minute, evacuation is incomplete or the system has a leak.

• Charge circuit(s) to the value indicated on the unit nameplate.

• Install bushing/clamp into evaporator wiring routing hole, and pull wires through into electrical control panel. Connect motor leads to load terminals on contactor/overload relay "C4/OL4".

• Ensure evaporator motor rotation is correct upon unit start-up. Switch any two wires at contactor "C4" if blower rotation is not correct.

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FIGURE 2 - 3/4/5 TON UNITS - DIMENSIONAL DATA & CORNER WEIGHTS

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FIGURE 3 - 8/10 TON UNITS - DIMENSIONAL DATA & CORNER WEIGHTS

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FIGURE 4 - 12/15 TON UNITS - DIMENSIONAL DATA & CORNER WEIGHTS

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FIGURE 5 - 20 TON UNIT - DIMENSIONAL DATA & CORNER WEIGHTS

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FIGURE 6 - 25 TON UNIT - DIMENSIONAL DATA & CORNER WEIGHTS

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OUTDOOR AIR DUCTWORK

When installing ductwork, adhere to local Codes andsensible practice. Minimize duct runs and avoid abruptchanges in direction where possible. Allow ampleaccess space for servicing of the coils and changing offilters. Perform regular maintenance on ducts toincrease unit life, maintain efficient operation, andreduce accumulation of explosive dust. Refer to blowerperformance charts, and engineer duct runs andaccessory pressure drop so as not to exceed maximumexternal static values.

LOUVER SIZING GUIDELINES

One of the key issues in obtaining optimum perfor-mance from indoor air-conditioners is the proper selec-tion of the condenser intake and discharge louvers.Unlike outdoor air cooled units, which intake and dis-charge their cooling virtually unrestricted, indoor unitsmust overcome the resistance of grilles or louvers atthe outside wall - plus the restriction of any intercon-necting ductwork.

Our indoor air cooled air-conditioners are designed toaccommodate the external static pressure loss associ-ated with properly sized louvers of the "storm proof”type. This type of louver typically has a free areaapproximately 40-45% of the actual louver size. Todetermine the free area required for any given unit,adhere to the following guidelines:

• Size condenser air intakes for 500-750 feet/minute nominal velocity (Maximum recommended 800 feet/minute)

• Size condenser air discharge for 1,200-1,500 feet/minute nominal velocity (Maximum recommended 1,700 feet/minute)

The use of louvers with higher velocities than abovemay be employed, at the discretion of the engineer/installer, provided that the total air pressure drop doesnot exceed the capability of the condenser fan andmotor. The use of low restriction louvers with shallowblade angles can allow higher face velocities withoutexcessive static pressure loss.

Exceeding the static pressure capability of the con-denser fan will result in insufficient condenser air vol-ume. This will cause a loss in system capacity, andmay cause compressor shutdown during high ambientperiods. (Installation of an oversize condenser motor/drive, where applicable, may be considered in suchcases.)

(As a general rule, these velocities will require anintake louver sized approximately 1.25 to 1.5 times thedimensions of the duct connection on the unit, and adischarge louver sized approximately 1.5 to 2 times theduct connection dimensions.)

Use only louver sections that provide different deflec-tion angles for air discharge and air intake, to ensurethe unit does not short circuit. Protect the unit fromweather conditions (rain, snow) entering through thecondenser air intake. All outdoor air ducts should pitchaway from the unit, toward the outside wall. Connect allducts to unit with canvas section duct connectors orchoose another suitable noise and vibration absorbingdevice.

NOTE: The Manufacturer will not accept any liability result-ing from incorrect installation of this equipment. Fol-low installation instructions carefully.

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EVAPORATOR BLOWER DISCHARGE CONVERSION

All models can be field converted to the alternate evap-orator discharge orientation, as indicated on the unitdimensional drawings. The 3 through 10 ton units areshipped with vertical fan discharge as standard. The 12through 25 ton units are shipped with horizontal fan dis-charge as standard.

Procedure for converting the fan discharge is similar onall models, single fan or dual fan.

• Remove the panel attachment screws on the alter-nate location access panel (front evaporator panel on 3-10 ton, roof panel on others). Remove the panel and set aside.

• Remove blower drive belt on all models with base mounted motors. Remove the complete fan motor and drive on models with blower mounted motor assemblies ( 3-5 ton ).

• Remove the panel attachment screws on the blower mounting panel. Do not remove fasteners

securing blowers to panel! The blowers are to remain attached to the mounting panel at all times.

• Carefully remove the blower panel assembly from the evaporator cabinet. Do not allow blower hous-ings to contact the evaporator coil during the removal. On some models, the housing(s) will have to be "rotated" to exit through the panel opening.

• Interchange the blower panel assembly with the position of the alternate access panel. Exercise care in locating the panel. Do not allow blower housings to contact the evaporator coil. Install the attachment screws and tighten securely.

• Install the blank access panel into the remaining evaporator opening. Fasten securely.

• Install drive belt on models with base mounted motors. Models with blower mounted motors require the motor mount to be relocated ( Fig. 7).

• Adjust drive belts to appropriate tension. Test run blower and observe operation for unusual sounds or vibration.

FIGURE 7 - HORIZONTAL AND STANDARD VERTICAL DISCHARGE CONVERSION

HORIZONTAL DISCHARGE STANDARD VERTICAL DISCHARGE

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ELECTRICAL WIRING

Follow local electrical codes when making electricalconnections. Units are completely factory wired for nor-mal supply voltages (ie.208-230, 460, 575V/3Ph/60Hz)Confirm unit specifications by checking unit data plate.All electrical components are accessible through anindependent electrical panel located on the "front" faceof the condensing section. The electrical control boxesare located behind outer access panels. The con-denser section electrical cover is installed with wiringdiagrams on the inside, which must be opened to beread.

Provide individual power disconnects for each unit, oreach section in the case of split applications. Install asecure ground to both evaporator and condenser. Ifcanvas flexible joints are used on ductwork, install aground wire to the ductwork as well.

IMPORTANT: All wiring must comply with applicablelocal and national codes (NEC). Type and location ofdisconnect switches must comply with all applicablecodes.

For low voltage thermostat wiring, 18 gauge wire maybe used for up to 50 feet lengths. Low voltage runs upto 125 feet require 16-gauge wire.

Disconnect and lock out power when servic-ing unit. unit may start automatically if poweris not disconnected. Failure to do so mayresult in personal injury or death due to elec-trical shock.

FIGURE 8 - TYPICAL WIRING DIAGRAM

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TABLE 1: ELECTRICAL DATA - EVAPORATOR MOTORS

MODEL VOLTAGE COMPRESSOR EVAPORATOR FAN MIN. CCT. MAX FUSE /

# QTY RLA LRA HP FLA HP FLA AMPACITY CCT. BKR. AMP

3 TON 208-230/1/60 1 @ 17.9 88.0 0.33 3.2 1.00 7.4 32.98 50208-230/3/60 1 @ 11.4 77.0 0.33 1.8 1.00 3.1 19.15 30

460/3/60 1 @ 5.7 39.0 0.33 0.8 1.00 1.4 9.33 15575/3/60 1 @ 4.7 31.0 0.33 0.6 1.00 1.1 7.59 15

4 TON 208-230/1/60 1 @ 20.4 109.0 0.50 4.4 1.00 7.4 37.30 50208-230/3/60 1 @ 13.9 88.0 0.50 2.1 1.00 3.1 22.58 35

460/3/60 1 @ 7.1 44.0 0.50 1.0 1.00 1.4 11.33 15575/3/60 1 @ 5.4 34.0 0.50 0.8 1.00 1.1 8.59 15

5 TON 208-230/3/60 1 @ 19.3 123.0 0.75 3.2 1.50 4.5 31.83 50460/3/60 1 @ 7.5 49.5 0.75 1.5 1.50 2.1 12.98 20575/3/60 1 @ 6.4 40.0 0.75 1.2 1.50 1.7 10.90 15

8 TON 208-230/3/60 2 @ 13.9 88 1.5 4.5 2.0 5.9 41.68 50460/3/60 2 @ 7.1 44 1.5 2.1 2.0 2.8 20.97 25575/3/60 2 @ 5.4 34 1.5 1.7 2.0 2.2 15.94 20

10 TON 208-230/3/60 2 @ 19.3 123.0 2.00 5.9 3.00 8.7 58.03 70460/3/60 2 @ 7.5 49.5 2.00 2.8 3.00 4.0 23.68 30575/3/60 2 @ 6.4 40.0 2.00 2.2 3.00 3.2 19.80 25

12 TON 208-230/3/60 2 @ 20.7 156.0 2.00 5.9 3.00 8.7 61.18 80460/3/60 2 @ 10.0 75.0 2.00 2.8 3.00 4.0 29.30 35575/3/60 2 @ 8.2 54.0 2.00 2.2 3.00 3.2 23.85 30

15 TON 208-230/3/60 2 @ 28.6 196.0 5.00 13.7 5.00 13.7 91.75 110460/3/60 2 @ 14.2 100.0 5.00 6.6 5.00 6.6 45.15 50575/3/60 2 @ 9.7 90.0 5.00 5.3 5.00 5.3 32.43 40

20 TON 208-230/3/60 2 @ 33.6 225.0 5.00 13.7 7.50 22.2 111.50 125460/3/60 2 @ 17.3 114.0 5.00 6.6 7.50 10.8 56.33 70575/3/60 2 @ 13.5 80.0 5.00 5.3 7.50 8.2 43.88 50

25 TON 208-230/3/60 3 @ 32.1 195.0 7.50 22.2 7.50 22.2 148.73 175460/3/60 3 @ 16.4 95.0 7.50 10.8 7.50 10.8 74.90 90575/3/60 3 @ 12.0 80.0 7.50 8.2 7.50 8.2 55.40 60

MODEL VOLTAGE COMPRESSOR EVAPORATOR FAN MIN. CCT. MAX FUSE /

# QTY RLA LRA HP FLA HP FLA AMPACITY CCT. BKR. AMP

3 TON 208-230/1/60 1 @ 17.9 88.0 0.50 4.4 1.00 7.4 34.18 50208-230/3/60 1 @ 11.4 77.0 0.50 2.1 1.00 3.1 19.45 30

460/3/60 1 @ 5.7 39.0 0.50 1.0 1.00 1.4 9.53 15575/3/60 1 @ 4.7 31.0 0.50 0.8 1.00 1.1 7.79 15

4 TON 208-230/1/60 1 @ 20.4 109.0 0.75 5.4 1.00 7.4 38.30 50208-230/3/60 1 @ 13.9 88.0 0.75 3.2 1.00 3.1 23.68 35

460/3/60 1 @ 7.1 44.0 0.75 1.5 1.00 1.4 11.83 15575/3/60 1 @ 5.4 34.0 0.75 1.2 1.00 1.1 8.99 15

5 TON 208-230/3/60 1 @ 19.3 123.0 1.00 3.7 1.50 4.5 32.33 50460/3/60 1 @ 7.5 49.5 1.00 1.7 1.50 2.1 13.18 20575/3/60 1 @ 6.4 40.0 1.00 1.3 1.50 1.7 11.00 15

8 TON 208-230/3/60 2 @ 13.9 88.0 2.00 5.9 2.00 5.9 43.08 50460/3/60 2 @ 7.1 44.0 2.00 2.8 2.00 2.8 21.67 25575/3/60 2 @ 5.4 34.0 2.00 2.2 2.00 2.2 16.44 20

10 TON 208-230/3/60 2 @ 19.3 123.0 3.00 8.7 3.00 8.7 60.83 80460/3/60 2 @ 7.5 49.5 3.00 4.0 3.00 4.0 24.88 30575/3/60 2 @ 6.4 40.0 3.00 3.2 3.00 3.2 20.80 25

12 TON 208-230/3/60 2 @ 20.7 156.0 3.00 8.7 3.00 8.7 63.98 80460/3/60 2 @ 10.0 75.0 3.00 4.0 3.00 4.0 30.50 40575/3/60 2 @ 8.2 54.0 3.00 3.2 3.00 3.2 24.85 30

15 TON 208-230/3/60 2 @ 28.6 196.0 5.00 13.7 5.00 13.7 91.75 110460/3/60 2 @ 14.2 100.0 5.00 6.6 5.00 6.6 45.15 50575/3/60 2 @ 9.7 90.0 5.00 5.3 5.00 5.3 32.43 40

20 TON 208-230/3/60 2 @ 33.6 225.0 7.50 22.2 7.50 22.2 120.00 150460/3/60 2 @ 17.3 114.0 7.50 10.8 7.50 10.8 60.53 70575/3/60 2 @ 13.5 80.0 7.50 8.4 7.50 8.4 47.18 60

25 TON 208-230/3/60 3 @ 32.1 195.0 10.00 25.6 7.50 22.2 152.13 175460/3/60 3 @ 16.4 95.0 10.00 11.6 7.50 10.8 75.70 90575/3/60 3 @ 12.0 80.0 10.00 9.6 7.50 8.2 56.80 60

Notes: Data shown for packaged unit installation, with single point power supply.

For split installation with separate evaporator motor power supply, calculate MCA and MFS as follows -

Min. Circuit Ampacity ( MCA ) = 1.25 X Largest motor amps (FLA or RLA) + sum of the remaining motor amps

Max Fuse / Cct. Bkr Size ( MFS ) = 2.25 X Largest motor amps + sum of the remaining motor amps

Select next smallest NEC listed fuse size from calculated value

CONDENSER FAN

CONDENSER FAN

STANDARD EVAPORATOR MOTOR

OVERSIZE EVAPORATOR MOTOR

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TABLE 2: SUPPLY FAN PERFORMANCE DATA

TABLE 3: CONDENSER AIR BLOWER PERFORMANCE

SUPPLY AIR BLOWER PERFORMANCE

MODEL SUPPLY 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0

# CFM RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP

1000 591 0.11 716 0.16 820 0.19 920 0.25 1027 0.30 1081 0.35 1216 0.43 1291 0.48 - - - -

3 TON 1200 660 0.17 770 0.22 870 0.28 966 0.33 1046 0.39 1133 0.45 1223 0.52 - - - - - -

1400 732 0.25 830 0.31 922 0.37 1007 0.43 1090 0.50 - - - - - - - - - -

1450 724 0.24 833 0.30 936 0.37 1022 0.44 1117 0.51 1207 0.59 1294 0.67 1377 0.75 - - - -

4 TON 1600 776 0.30 876 0.37 972 0.44 1060 0.53 1153 0.61 1231 0.68 1305 0.76 - - - - - -

1800 850 0.41 940 0.49 1028 0.57 1111 0.65 1190 0.74 - - - - - - - - - -

1800 850 0.41 940 0.49 1028 0.57 1111 0.66 1191 0.75 1269 0.82 1344 0.84 1415 0.94 - - - -

5 TON 2000 921 0.54 1003 0.63 1083 0.71 1161 0.80 1237 0.89 1309 0.98 - - - - - - - -

2200 997 0.71 1073 0.79 1146 0.89 1218 0.98 1288 1.08 - - - - - - - - - -

3000 734 0.76 809 0.89 881 1.02 950 1.17 1016 1.32 1079 1.47 1139 1.63 1196 1.79 1251 1.97 1303 2.17

8 TON 3200 771 0.90 843 1.03 911 1.17 977 1.32 1040 1.47 1101 1.63 1159 1.81 1214 2.01 - - - -

3400 811 1.06 879 1.20 944 1.35 1007 1.50 1068 1.66 1128 1.83 1187 2.01 - - - - - -

3600 800 1.13 867 1.28 931 1.43 993 1.59 1052 1.74 1100 1.88 1158 2.11 1225 2.25 1245 2.50 1335 2.66

10 TON 4000 876 1.52 937 1.68 996 1.85 1052 2.01 1100 2.23 1154 2.31 1200 2.55 1263 2.72 1304 2.93 1367 3.12

4400 951 1.98 1007 2.16 1062 2.35 1120 2.52 1178 2.76 1204 2.92 1263 3.15 - - - - - -

4300 717 1.06 792 1.23 862 1.41 928 1.58 989 1.75 1049 1.93 1100 2.10 1165 2.30 1210 2.50 1245 2.60

12 TON 4800 781 1.42 850 1.62 915 1.81 976 2.00 1035 2.20 1091 2.39 1144 2.58 1197 2.79 1245 2.96 - -

5300 848 1.87 912 2.08 972 2.29 1030 2.57 1085 2.72 1138 2.94 1189 3.15 - - - - - -

5400 765 1.93 818 2.16 870 2.41 920 2.70 970 2.90 1010 3.20 1050 3.46 1100 3.70 1145 3.90 1180 4.30

15 TON 6000 824 2.52 873 2.77 920 3.03 967 3.30 1010 3.58 1052 3.90 1097 4.24 1137 4.59 1178 4.95 1220 5.33

6600 903 3.33 947 3.60 991 3.89 1034 4.19 1076 4.49 1110 4.80 1150 5.10 - - - - - -

7200 657 1.89 717 2.19 774 2.51 829 2.84 875 3.18 933 3.53 972 3.89 1024 4.26 1072 4.63 1113 5.02

20 TON 8000 717 2.51 772 2.84 825 3.20 875 3.55 924 3.92 976 4.31 1022 4.72 1062 5.15 1105 5.60 1145 6.07

8800 778 3.27 830 3.64 878 4.01 925 4.40 970 4.79 1015 5.20 1067 5.63 1102 6.08 1140 6.54 1183 7.03

9000 785 3.42 836 3.80 884 4.18 930 4.56 975 4.97 1019 5.38 1068 5.81 1100 6.26 1143 6.75 1184 7.24

25 TON 10000 861 4.59 907 5.00 952 5.43 994 5.85 1035 6.27 1076 6.73 1116 7.19 1155 7.66 1198 8.15 1225 8.66

11000 938 6.02 981 6.48 1022 6.94 1061 7.39 1100 7.87 1137 8.34 1174 8.82 1210 9.32 1246 9.83 1281 10.34

NOTE:

2. Values include pressure drop from wet coil and clean filters.

3. Shaded areas indicate oversize motor and drive is required.

4. Adjustment limits of standard factory-installed drives are indicated by bold borders. (See pulley data on Pg. 17)

EXTERNAL STATIC PRESSURE - Inches W.C.

1. At higher evaporator airflows, and wet bulb conditions condensate carry-over may occur. Adjust airflow downward as necessary.

MODEL OUTDOOR 0.2 0.4 0.6 0.8 1.0 1.2

# CFM RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP

3 TON 2400 623 0.43 714 0.53 800 0.63 887 0.74 963 0.87 - -

4 TON 2600 655 0.52 741 0.63 823 0.74 894 0.88 964 1.00 - -

5 TON 3200 767 0.89 839 1.03 908 1.17 973 1.31 1035 1.46 - -

8 TON 4700 737 1.19 811 1.38 882 1.59 951 1.82 1017 2.07 - -

10 TON 5500 804 1.71 873 1.94 941 2.19 1008 2.46 1073 2.75 1136 3.06

12 TON 6600 675 1.77 735 2.06 792 2.46 848 2.60 900 3.00 - -

15 TON 7500 725 2.35 780 2.67 834 3.01 886 3.37 936 3.76 983 4.18

20 TON 10200 656 3.72 700 4.12 741 4.50 781 4.91 820 5.32 857 5.73

25 TON 11500 687 4.76 728 5.20 767 5.64 805 6.09 841 6.52 876 6.97

EXTERNAL STATIC PRESSURE - Inches W.C.

036-21540-001-A-0503

Unitary Products Group 17

BLOWER SPEED ADJUSTMENT

The RPM of the supply air and condenser air blowerswill depend on the required CFM, and the static resis-tance of both the supply/discharge and the return/intake duct systems. With this information, the RPM forthe blowers can be determined from the blower perfor-mance tables. Adjustment of blower speed is accom-plished as follows:

1. Loosen belt tension by moving motor towards the blower shaft via the adjustable mounting.

2. Loosen the setscrew in the adjustable motor pulley flange. Remove key on pulleys 4-in. diameter and larger.

3. Blower speed will increase when moveable flange is adjusted towards the fixed flange (closed). Blower speed will decrease when the moveable flange is adjusted away from the fixed flange (opened). Pulleys are adjustable only in half-turn increments. Do not open pulley more than five full turns for "4L" and "A" belts, or six full turns for "B" belts.

4. Once the pulley has been opened/closed the appropriate numbers of turns, replace the external key and tighten the adjustment setscrew. Proper torque is 110-130 in.-lbs.

5. Install drive belts and adjust motor mount to ten-sion belt.

TABLE 4: MOTOR AND PULLEY DATA

EVAPORATOR - STANDARD BLOWER MOTOR AND DRIVE DATA

Belts

HP Frame Eff.(%) Pitch Dia.(in) Browning # Pitch Dia.(in) Browning# Rating / Size Qty

3 TON 673-1010 1/3 56 68.0 2.0-3.0 1VP34 X 5/8 5.2 AK54H 4L370 1

4 TON 714-1071 1/2 56 75.0 2.0-3.0 1VP34 X 5/8 4.9 AK51H 4L370 1

5 TON 795-1193 3/4 56 75.0 2.0-3.0 1VP34 X 5/8 4.4 AK46H 4L360 1

8 TON 784-1045 1 1/2 145 84.0 3.0-4.0 1VP44 X 7/8 6.7 AK69H 4L380 1

10 TON 820-1094 2 145 84.0 3.0-4.0 1VP44 X 7/8 6.4 AK66H 4L370 1

12 TON 784-1045 2 145 84.0 3.0-4.0 1VP44 X 7/8 6.7 AK69H 4L370 1

15 TON 848-1064 5 184 87.5 4.7-5.9 1VP60 X 1-1/8 9.7 BK100H B40 1

20 TON 848-1064 5 184 87.5 4.7-5.9 1VP60 X 1-1/8 9.7 BK100H B50 1

25 TON 902-1082 7-1/2 213 88.5 5.0-6.0 1VP62 X 1-3/8 9.7 BK100H BX51 1

EVAPORATOR - OVERSIZE BLOWER MOTOR AND DRIVE DATA

Belts

HP Frame Eff.(%) Pitch Dia.(in) Browning # Pitch Dia.(in) Browning# Rating / Size Qty

3 TON 897-1346 1/2 56 68.0 2.0-3.0 1VP34 X 5/8 3.9 AK41H 4L350 1

4 TON 946-1419 3/4 56 75.0 2.0-3.0 1VP34 X 5/8 3.7 AK39H 4L350 1

5 TON 946-1419 1 56 75.0 2.0-3.0 1VP34 X 5/8 3.7 AK39H 4L350 1

8 TON 972-1296 2 145 84.0 3.0-4.0 1VP44 X 7/8 5.4 AK56H 4L360 1

10 TON 1068-1364 3 145 86.5 3.6-4.6 1VP50 X 1-1/8 5.9 AK61H A35 1

12 TON 984-1258 3 145 86.5 3.6-4.6 1VP50 X 1-1/8 6.4 AK66H A36 1

15 TON 848-1064 5 184 87.5 4.7-5.9 1VP60 X 1-1/8 8.2 BK85H B36 1

20 TON 1046-1287 7-1/2 213 88.5 5.2-6.4 1VP65 X 1-3/8 8.8 BK90H BX50 1

25 TON 1033-1296 10 213 88.5 4.7-5.9 1VP60 X 1-3/8 15.7 BK160H BX60 1

CONDENSER - STANDARD BLOWER MOTOR AND DRIVE DATA

Belts

HP Frame Eff.(%) Pitch Dia.(in) Browning # Pitch Dia.(in) Browning# Rating / Size Qty

3 TON 673-1010 1 143 82.5 2.0-3.0 1VP34 X 7/8 5.4 AK54H 4L400 1

4 TON 648-972 1 143 82.5 2.0-3.0 1VP34 X 7/8 5.4 AK56H 4L400 1

5 TON 771-1068 1 1/2 145 84.0 2.6-3.6 1VP40 X 7/8 5.9 AK61H 4L420 1

8 TON 761-1014 2 145 84.0 3.0-4.0 1VP44 X 7/8 6.9 AK71H A65 1

10 TON 875-1118 3 182 86.5 3.6-4.6 1VP50 X 1-1/8 7.2 AK74H A65 1

12 TON 685-875 3 184 86.5 3.6-4.6 1VP50 X 1-1/8 9.2 AK94H A68 1

15 TON 794-974 5 184 87.5 4.4-5.4 1VP56 X 1-1/8 9.7 BK100H B69 1

20 TON 717-882 7-1/2 213 87.5 5.2-6.4 1VP65 X 1-3/8 12.7 BK130H B80 1

25 TON 717-882 7-1/2 213 87.5 5.2-6.4 1VP65 X 1-3/8 12.7 BK130H B88 1

Adjustable

Motor Pulley

Fixed

Blower Pulley

Adjustable

Motor Pulley

Fixed

Blower Pulley

Drive Range

(RPM)

MotorAdjustable

Motor PulleyModelDrive Range

(RPM)

Fixed

Blower Pulley

ModelMotor

MotorModel

Drive Range

(RPM)

036-21540-001-A-0503

18 Unitary Products Group

LOW AMBIENT DAMPER INSTALLATIONIf unit operation is required at outdoor ambient below60°F, the optional Low Ambient Damper kit should beinstalled to maintain acceptable condensing pressure.

The damper is installed directly onto the discharge ductconnection as illustrated. The damper is controlled viaa refrigerant pressure actuator. Two different actuatormounting arrangements are used, depending on thesize of the damper. Appropriate mounting hardware forthe actuator is provided with each kit. The pressureactuator is connected to the liquid line access fittingthrough a 1/4 in. copper tube. Attach the tubing usingflare nuts at each end. A routing hole is provided in thecondenser corner panel near the actuator mountingposition. Purge the 1/4-in. sensing line by loosening theflare nut at the actuator until liquid refrigerant isobserved leaking from the fitting. Tighten the flare nutssecurely.

NOTE: On dual and triple compressor units, the actuatorMUST be connected to the #1 circuit liquid line fit-ting. Connection to the second or third stage refrig-erant circuit will result in system malfunction.

A solid-state timer(s) is provided with the damper kit.The timer will bypass the low-pressure switch duringcompressor start-up. The time delay allows the con-densing pressure to rise sufficiently for refrigerant flowthrough the evaporator to be established. The 8-25 tonunits require a timer to be installed on each compres-sor circuit.

Mount the timer(s) in the condenser electrical panel.Mounting holes are provided near the lockout relays(R1, R2). Connect the timers into the compressor con-trol circuit as shown. The wire splice between the LPCand HPC switches is accessible inside the electricalpanel, in the low voltage section of the enclosure.

Test run the unit, and confirm proper operation. Thedamper should be fully closed when condensing pres-sure is below 165 psig, and should be fully open at con-densing pressures of 250 psig and above.

FIGURE 9 - LOW AMBIENT DAMPER INSTALLATION

036-21540-001-A-0503

Unitary Products Group 19

START-UP AND OPERATION

Start unit and check rotation of fans and compressors.

Scroll compressors will only compress in one rotationaldirection. Three phase compressors will rotate in eitherdirection depending upon phasing of the power. Sincethere is a 50-50 chance of connecting power in such away as to cause rotation in the reverse direction, it isimportant to ensure proper rotation direction is

achieved when the system is installed and oper-ated.

Verification of proper direction is made by observingthat suction pressure drops and discharge pressurerises when the compressor is energized. Reverse rota-tion also results in an elevated sound level as well assubstantially reduced current draw.

There is no negative impacts on durability caused byoperating three phase Scroll compressors in thereversed direction for a short period of time (less thanone hour). However, after several minutes of operationthe compressors internal protector will trip.

If opposite rotation is needed, disconnect and reverseany two leads of the three-phase supply. Reconnectpower and observe for correct rotation.

Observe unit operation and check for unusual noise orvibration.

Prior to starting unit for the first time, turn the ther-mostat system switch to OFF - or raise the coolingset point to the highest temperature, to prevent theunit from starting. Close the electrical disconnectswitch. This will energize the compressor crank-case heater(s). WAIT A MINIMUM OF FOURHOURS BEFORE STARTING THE SYSTEM. Thisperiod will allow the crankcase heater to vaporizeany liquid refrigerant in the compressor crankcase.

TABLE 5: REFRIGERANT CHARGE

TABLE 6: PRESSURE SWITCH SETTINGS

Subject to change without notice. Printed in U.S.A.Copyright © by Unitary Products Group 2003. All rights reserved. Supersedes: Nothing 036-21540-001-A-0503

Unitary 5005 NormanProducts York OKGroup Drive 73069

MAINTENANCE / SERVICE

FILTERS

Inspect filters monthly and replace as necessary. UseUL Class 2 rated filters. Factory supplied filters aremedium efficiency, extended surface pleated type.Replacements should be of the same type, to maintainoptimum airflow performance. Filter sizes are as fol-lows:

EVAPORATOR AND CONDENSER COILS

Inspect the evaporator coil at filter change intervals.Inspect the condenser coil at least semi-annually. A

dirty condenser coil will result in elevated condensingpressures and poor unit performance. Dirty or cloggedevaporator coils cause low suction pressure and lostcapacity. If the coils appear dirty, clean them using milddetergent or a commercial coil-cleaning agent.

BLOWERS

Inspect both the evaporator and condenser blowers ateach regular service interval. Clean blower wheels asneeded. Bearings are permanently sealed ball type,and do not require lubrication. Check bearings for anysigns of wear (movement between inner and outerraces). Ensure bearing locking collars are secure to theshaft, and that collar locking screw is properly set.Check that the blower wheel is tight on the shaft, andthat the hub setscrews are properly torqued.

DRIVE BELTS

Examine belts periodically for wear. Glazed areas onthe drive surfaces indicate overheating due to belt slip-page. Ideal tension is the lowest tension at which thebelt will not slip under peak load conditions. Over-ten-sioning shortens belt and bearing life.

The tension on the belt should be adjusted for a deflec-tion of 1/64 of an inch per inch of belt span, with theappropriate force applied at the midpoint of the span.Tension “New” belts at the maximum value indicated.Used belts should be maintained at the minimumvalue.

REFRIGERANT CIRCUIT (S)

With the unit operating, check and record the compres-sor discharge and suction pressures. The compressorrunning current should also be recorded.

A maintenance log of these readings can indicate if theunit is operating within its normal limits. Abnormal read-ings should be investigated, and the cause corrected.

Disconnect and lock out power when servicing unit.Failure to do so may result in personal injury ordeath due to electrical shock.

Exercise care when working around the sharpmetal edges of door panels or door frames, etc.These edges can cause injury.

Filters 3 TON 4 TON 5 TON 8 TON 1 0 TON 12 TON 15 TON 20 TON 25 TON

Qty/Size 2/18x24x2 2/18x24x2 2/18x24x2 4/14x25x2 4/14x25x22/14x20x2

4/14x25x2

2/14x20x2

4/14x25x26/20x25x2 8/20x20x2

FIGURE 10 - BELT ADJUSTMENT