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Copyright 2009 Thermal Care

Product Catalog

MX Series Rotary Screw Modular Chillers 50 to 125 Tons

Contents

FEATURES AND BENEFITS .................................................................................................................. 1

Easy Installation ....................................................................................................................................................................... 1 Powerful Control System ......................................................................................................................................................... 1 Rotary Screw Compressor ....................................................................................................................................................... 2 Stainless Steel Brazed Plate Evaporator .................................................................................................................................. 3

MODEL NUMBER DESCRIPTION ......................................................................................................... 4

GENERAL DATA ................................................................................................................................. 5

Table 1 – Water Cooled Chiller General Data (60 Hz) ......................................................................................................... 5 Table 2 – Remote Air-Cooled Condenser Chiller General Data (60 Hz) .............................................................................. 6 Table 3 – Chiller Electrical Data (60 Hz) .............................................................................................................................. 7 Table 4 – Remote Air-Cooled Condenser Electrical Data (60 Hz) ........................................................................................ 7

PERFORMANCE DATA........................................................................................................................ 8

MXW Series Ratings................................................................................................................................................................. 8 Table 5 – MXW Series Cooling Capacities (60 Hz) ............................................................................................................... 8

MXR Series Ratings ................................................................................................................................................................ 10 Table 6 – MXR Series Cooling Capacities (60 Hz) .............................................................................................................. 10

WEIGHT & DIMENSION DRAWINGS ................................................................................................. 12

Figure 1 – MXW50 Water-Cooled Condenser Chiller Weights & Dimensions Drawing .................................................... 12 Figure 2 – MXW75 Water-Cooled Condenser Chiller Weights & Dimensions Drawing .................................................... 13 Figure 3 – MXW100 Water-Cooled Condenser Chiller Weights & Dimensions Drawing .................................................. 14 Figure 4 – MXW125 Water-Cooled Condenser Chiller Weights & Dimensions Drawing .................................................. 15 Figure 5 – MXR50 Remote Air Cooled Condenser Chiller Weights & Dimensions Drawing .............................................. 16 Figure 6 – MXR75 Remote Air Cooled Condenser Chiller Weights & Dimensions Drawing .............................................. 17 Figure 7 – MXR100 Remote Air Cooled Condenser Chiller Weights & Dimensions Drawing ............................................ 18 Figure 8 – MXR125 Remote Air Cooled Condenser Chiller Weights & Dimensions Drawing ............................................ 19 Figure 9 – MXR50 Remote Condenser Model LAVF14412 Weight & Dimensions Drawing .............................................. 20 Figure 10 – MXR75 Remote Condenser Model LAVF16410 Weight & Dimensions Drawing ............................................ 21 Figure 11 – MXR100 Remote Condenser Model LAVF24410 Weight & Dimensions Drawing .......................................... 22 Figure 12 – MXR125 Remote Condenser Model LAVF25410 Weight & Dimensions Drawing .......................................... 23

APPLICATION CONSIDERATIONS ...................................................................................................... 24

Unit Location ......................................................................................................................................................................... 24 Evaporator Fluid Temperature .............................................................................................................................................. 24 Evaporator Flow .................................................................................................................................................................... 24

Table 7 – Cooler Flow Rate Limitations ............................................................................................................................. 24 Condenser Water Temperature & Flow (Water-Cooled Units) ............................................................................................. 25

Table 8 – Water Cooled Condenser Flow Rate Limitations ............................................................................................... 25 Condenser Air Temperature (Remote Air-Cooled Units) ...................................................................................................... 25 System Fluid Freeze Protection ............................................................................................................................................. 25 Over-sizing Chillers ................................................................................................................................................................ 26 Strainers ................................................................................................................................................................................ 26 Remote Condenser Selection ................................................................................................................................................ 26

EVAPORATOR AND CONDENSER PRESSURE DROP ........................................................................... 27

Figure 13 – Evaporator Coolant Pressure Drop Curves ..................................................................................................... 27 Figure 14 – Condenser Water Pressure Drop Curves ........................................................................................................ 28

1

Features and Benefits The need for dependable industrial chilled water systems has led to the development of our MX Series modular rotary-screw compressor chillers. Building on over 35 years of experience in the design and manufacturing of industrial chillers and chilled water system, Thermal Care has created this product line to meet the demands of modern production needs in a compact package that is easy to locate and provides the added flexibility of allowing for easy system expansion in the future. Our approach to modularity with a straightforward mechanical design and PLC controls provide a solid performing chiller that will provide the dependable performance required of industrial chillers.

Easy Installation • Compact size designed to minimize the amount of valuable production floor space required while providing easy of

access to the unit controls and components • Starters, control transformer, flow switch, and all required sensors mounted and wired to the control panel at the factory

thereby reducing installation labor, time, and material costs • Common inlet and outlet centerline dimensions throughout the entire product line allow for easy installation and

expansion of the system with a common horizontal manifold.

Powerful Control System • Allen-Bradley Compact Logix PLC monitors, controls, and maintains stable and reliable operation of the chiller through

use of an extensive array of sensors, actuators, relays, switches, and control algorithms. • Use of multiple Proportional Integral Derivative (PID) temperature control loops ensures consistent reliability, stability,

and efficient operation by instantly registering and reacting to fluctuations in system loads. • Predictive control loop designed to keep the system operational under low load or sever batch-loading conditions typical

of industrial chilling systems. This control logic monitors changes in the process load and attempts to keep the system from shutting off compressors by unloading the compressors as needed to prevent high/low refrigerant pressure or high motor current conditions that would shutdown typical chillers with simple pressure and current switches. This ensures full capacity the moment it is required without having to run through a compressor anti-recycle timer and without causing an alarm condition other chillers would have under similar conditions.

• Durable touch-screen Human Machine Interface (HMI) provide and extensive amount of system diagnostic and operational information as well as a comprehensive list of safeties and alarm indications accessible with a simple touch of the display.

• Clear language text display and graphic representation of unit components provides quick and easy understanding of unit operation. Alarms Compressor motor overload Evaporator freeze protection Evaporator low flow Oil low level Power loss of phase Process supply water above high temperature alarm set point Process supply water below low temperature alarm set point Refrigerant high pressure Refrigerant low pressure Status banner of start-up and shut-down sequences

Control Panel Display Compressor refrigerant discharge pressure Compressor refrigerant discharge temperature Compressor refrigerant suction pressure Compressor refrigerant suction temperature Compressor refrigerant superheat temperature Compressor running hours Compressor slide % staging

2

Condenser % variable speed fan (air cooled chillers only) Condenser fans quantity running (air cooled chillers only) Condenser water inlet temperature Condenser water outlet temperature Condenser water regulating valve position (water cooled chillers only) Electronic expansion valve position (% open) Evaporator water inlet temperature Evaporator water outlet temperature Process water set point temperature System % demand

Control Functions Alarm history occurrence with reset date and time stamp Compressor anti-recycle timer Compressor enable/disable Fixed or floating discharge pressure control (selectable) High suction pressure control Internal calendar and clock Password protection of adjustable parameters (two levels – user settable, and factory settable) Process water high temperature alarm Process water low temperature alarm Remote alarm contact Remote start/stop Single point chilled water and cooling tower system enable Single point selection between English and Metric units of measure

Safety Functions (will shutdown compressor) Compressor motor high temperature Compressor motor overload Compressor motor reverse rotation Evaporator freeze protection Evaporator low flow Oil low level Power loss of phase Refrigerant high pressure Refrigerant low pressure

Rotary Screw Compressor Rotary screw compressors are an ideal choice for the heavy-duty demands of industrial cooling. Some key features of this compressor technology are: • Suction and discharge service valves • Internal pressure relief valve • Internal discharge check valve • Electronic motor protection - Six sensors monitoring motor temperature - Correct three-phase power connection - Phase symmetry - Restart time delay • Infinite or 4-step capacity control • Automatic unloaded start • Insertion type crankcase heater • Integrated oil separator • Oil service fill/drain valve • Oil sight glass • Lifetime internal oil filter

3

Stainless Steel Brazed Plate Evaporator • Stainless steel plate evaporators provide a level of corrosion protection not found in other chillers. • Our compact brazed plate heat exchangers reduce the overall refrigerant charge of our system compared to a typical

shell and tube design evaporator • The reduced size of the evaporator allows us to keep the overall weight and size of the unit to a minimum • Due to the increased velocities of the passages inside the evaporator, our brazed plate evaporators can tolerate higher

flows than typical shell & tube evaporators

4

Model Number Description

5

General Data Table 1 – Water Cooled Chiller General Data (60 Hz)

Model MXW50 MXW75 MXW100 MXW125

Compressor

Quantity 1 1 1 1

Nominal Capacity (ton) 53.0 74.4 101.0 126.0

Number of Capacity Steps Continuously Variable Capacity Adjustment

Minimum Unloaded Capacity (ton) 18.0 28.0 34.0 42.0

Condenser

Fluid Volume (gal) 12 17 24 28

Maximum Refrigerant Pressure (psig) 400 400 400 400

Refrigerant Pressure Relief Valve Setting (psig) 400 400 400 400

Refrigerant Pressure Relief Valve (in) 5/8 SAE Flare 5/8 SAE Flare 3/4 FPT 3/4 FPT

Refrigerant Pressure Relief Valve Flow Capacity (lbs. of air/min) 26.8 26.8 54.0 54.0

Maximum Fluid Pressure (psig) 150 150 150 150

Fluid Inlet Flange Connection (in) 3 4 4 4

Fluid Outlet Flange Connection (in) 3 4 4 4

Fluid Drain NPT Connection (in) 3/8 3/8

3/8 3/8

Evaporator







1/2 1/2

General Information

Refrigerant Type R134a R134a R134a R134a

Refrigerant Charge (lb) 75 105 140 175

Oil Charge (oz) 507 744 744 744

Shipping Weight (lb) 2,965 3,915 4,315 5,020

Operating Weight (lb) 3,145 4,095 4,575 5,330

6

Table 2 – Remote Air-Cooled Condenser Chiller General Data (60 Hz)

Size MXR50 MXR75 MXR100 MXR125

Compressor

Quantity 1 1 1 1

Nominal Capacity (ton) 47.6 67.5 91.8 114.9

Number of Capacity Steps 4 4 4 4

Minimum Unloaded Capacity (ton) 18.0 28.0 34.0 42.0

Condenser


Refrigerant Pressure Relief Valve Setting (psig) 400 400 400 400

Refrigerant Pressure Relief Valve SAE Flare (in) 5/8

5/8 5/8

5/8

Refrigerant Pressure Relief Valve Capacity (lbs. of air/min) 26.8 26.8 26.8 26.8

Liquid Line Connection (in) 1 3/8 1 5/8 2 1/8 2 1/8

Discharge Line Connection (in) 2 1/8 2 5/8 2 5/8 3 1/8

Evaporator







1/2 1/2

General Information

Refrigerant Type R134a R134a R134a R134a

Refrigerant Charge (lb) Varies based on system refrigerant piping – see Installation Guidelines

Oil Charge (oz) 507 744 744 744

Shipping Weight Chiller (lb) 2,495 3,340 3,485 3,700

Operating Weight Chiller (lb) 2,620 3,510 3,710 3,980

Shipping Weight Remote Condenser (lb) 1,600 2,810 2,885 4,050

Operating Weight Remote Condenser (lb) Varies base on system refrigerant charge and operating conditions

7

Table 3 – Chiller Electrical Data (60 Hz)

Model Rated

Voltage

Allowable Supply Number of Power

Connections

Number of Conductors

Compressor Data Unit Data

Min Max RLA1 LRA2 MCA3 MOCP4

MXW50 460/3/60 414 506 1 3 112 267 142 250

575/3/60 518 632 1 3 90 212 114 200

MXW75 460/3/60 414 506 1 3 137 433 173 300

575/3/60 518 632 1 3 109 346 138 225

MXW100 460/3/60 414 506 1 3 166 563 209 350

575/3/60 518 632 1 3 133 449 168 300

MXW125 460/3/60 414 506 1 3 219 716 275 450

575/3/60 518 632 1 3 175 577 220 350

MXR50 460/3/60 414 506 1 3 112 267 142 250

575/3/60 518 632 1 3 90 212 114 200

MXR75 460/3/60 414 506 1 3 137 433 173 300

575/3/60 518 632 1 3 109 346 138 225

MXR100 460/3/60 414 506 1 3 166 563 209 350

575/3/60 518 632 1 3 133 449 168 300

MXR125 460/3/60 414 506 1 3 219 716 275 450

575/3/60 518 632 1 3 175 577 220 350

Notes: 1. RLA is Rated Load Amps 2. LRA is Locked Rotary Amps 3. MCA is Minimum Circuit Ampacity (for wire sizing) 4. MOCP is Maximum Overcurrent Protection

Table 4 – Remote Air-Cooled Condenser Electrical Data (60 Hz)

Model Rated

Voltage4

Allowable Supply Number of Power

Connections

Number of Conductors

Fan Data Unit Data

Min Max Qty RLA1 Each MCA2 MOCP3

LAVF-14412 460/3/60 414 506 1 3 4 3.5 15 20

LEVF-16410 460/3/60 414 506 1 3 6 3.5 22 30

LAVF-24410 460/3/60 414 506 1 3 8 3.5 29 35

LAVF-25410 460/3/60 414 506 1 3 10 3.5 36 45

Notes: 1. RLA is Rated Load Amps 2. MCA is Minimum Circuit Ampacity (for wire sizing) 3. MOCP is Maximum Overcurrent Protection 4. 575/3/60 remote condensers require special selection and pricing. Consult factory for details.

8

Performance Data

MXW Series Ratings All performance data is based on: 1. Coolant temperature rise of 10°F (5.6°C) 2. Cooler fouling factor of 0.0001 ft2 • hr • °F/Btu (0.000018 m3 • kW) 3. Condenser fouling factor of 0.00025 ft2 • hr • °F/Btu (0.000044 m3 • kW) 4. Subcooling of 10°F (5.6°C) 5. Refrigerant R-134A

Table 5 – MXW Series Cooling Capacities (60 Hz)

LCWT1

(°F) Model

Condenser Entering Water Temperature (°F)

80 85 90 95

Cap2 Input kW3

Cooler Flow Rate

(gpm)

Cond4

Flow Rate

(gpm)

Cap2 Input kW3

Cooler Flow Rate

(gpm)

Cond4

Flow Rate

(gpm)

Cap2 Input kW3

Cooler Flow Rate

(gpm)

Cond4

Flow Rate

(gpm)

Cap2 Input kW3

Cooler Flow Rate

(gpm)

Cond4

Flow Rate

(gpm)

20

MXW50 27.8 33.1 73.8 89.5 26.8 34.7 71.3 88.5 25.9 36.5 68.8 87.5 24.9 38.4 66.1 86.4

MXW75 38.6 45.5 102.5 124.1 37.3 47.8 99.2 122.8 36.0 50.4 95.7 121.5 34.7 53.2 92.2 120.3

MXW100 52.3 59.4 139.1 166.7 50.9 62.9 135.2 165.7 49.3 66.5 131.0 164.6 47.7 70.3 126.7 163.5

MXW125 66.3 75.8 176.2 211.6 64.4 80.0 171.2 210.1 62.5 84.4 166.0 208.6 60.4 89.2 160.6 207.3

25

MXW50 31.5 33.6 82.0 98.8 30.5 35.3 79.4 97.7 29.4 37.1 76.7 96.5 28.4 39.1 73.9 95.3

MXW75 43.7 46.2 113.9 137.0 42.4 48.5 110.4 135.4 41.0 51.1 106.8 134.0 39.5 53.9 103.0 132.6

MXW100 59.1 60.7 153.9 183.8 57.5 64.1 149.7 182.5 55.8 67.8 145.3 181.1 54.0 71.6 140.7 179.7

MXW125 74.8 77.4 194.8 233.1 72.7 81.6 189.4 231.2 70.6 86.0 183.8 229.3 68.4 90.8 178.1 227.6

30

MXW50 35.5 34.3 90.7 108.9 34.4 36.0 88.0 107.6 33.3 37.8 85.1 106.2 32.1 39.8 82.1 104.9

MXW75 49.3 46.9 126.0 150.8 47.8 49.3 122.3 149.1 46.3 51.9 118.5 147.3 44.8 54.7 114.5 145.7

MXW100 66.3 62.0 169.7 202.2 64.6 65.4 165.1 200.5 62.7 69.1 160.4 198.8 60.8 73.0 155.5 197.0

MXW125 83.9 79.1 214.5 256.2 81.6 83.3 208.8 253.9 79.3 87.7 202.9 251.6 76.9 92.6 196.8 249.4

35

MXW50 39.7 35.0 99.9 119.6 38.6 36.7 97.1 118.2 37.4 38.6 94.0 116.7 36.1 40.6 90.9 115.1

MXW75 55.2 47.7 138.9 165.7 53.6 50.1 135.0 163.7 52.0 52.7 130.9 161.7 50.4 55.5 126.7 159.8

MXW100 74.1 63.3 186.5 221.9 72.2 66.8 181.7 219.9 70.2 70.4 176.7 217.8 68.1 74.3 171.4 215.6

MXW125 93.7 81.0 235.7 281.1 91.2 85.1 229.5 278.3 88.7 89.6 223.2 275.6 86.1 94.5 216.7 273.0

40

MXW50 44.7 35.8 106.9 132.1 43.4 37.6 103.9 130.4 42.1 39.5 100.8 128.7 40.7 41.5 97.5 126.9

MXW75 62.7 48.7 149.9 184.3 60.9 51.2 145.8 182.0 59.1 53.8 141.5 179.6 57.3 56.7 137.1 177.3

MXW100 85.0 65.2 203.6 249.4 82.8 68.4 198.2 246.6 80.5 72.1 192.6 243.7 78.1 76.0 186.9 240.9

MXW125 106.3 83.4 254.5 313.2 103.6 87.5 248.0 309.8 100.8 92.1 241.2 306.4 97.9 96.9 234.3 303.1

42

MXW50 46.5 36.1 111.4 136.8 45.2 37.9 108.3 135.0 43.9 39.8 105.1 133.2 42.5 41.9 101.7 131.4

MXW75 65.3 49.1 156.3 190.8 63.5 51.6 152.0 188.4 61.6 54.2 147.6 185.9 59.7 57.1 143.1 183.5

MXW100 88.1 64.6 211.0 256.5 86.0 69.0 206.0 254.7 83.8 72.7 200.6 252.0 81.4 76.6 194.8 249.1

MXW125 110.7 84.2 265.0 324.2 107.8 88.4 258.3 320.6 105.0 92.9 251.3 317.0 102.0 97.8 244.2 313.6

44

MXW50 48.4 36.4 116.0 141.6 47.1 38.2 112.9 139.7 45.7 40.2 109.5 137.9 44.3 42.2 106.1 135.9

MXW75 67.9 49.5 162.7 197.5 66.1 52.0 158.4 195.0 64.2 54.6 153.8 192.4 62.3 57.5 149.2 189.9

MXW100 91.7 65.1 219.6 265.4 89.5 69.5 214.5 263.5 87.2 73.3 208.9 260.7 84.7 77.2 203.0 257.6

MXW125 115.1 85.0 275.8 335.5 112.2 89.2 268.9 331.7 109.2 93.8 261.7 328.0 106.2 98.7 254.4 324.3

Notes: 1. LCWT = Leaving Coolant Temperature 2. Cap = Capacity in tons of refrigeration 3. kW = Compressor motor input power at rated voltage 4. Cond = Condenser 5. = Requires antifreeze protection of system fluid. See Application Consideration section for more details. Capacities, energy use, and flows based

upon ethylene glycol solutions as follows based on Leaving Coolant Temperature: 15% for 35°F, 20% for 30°F, 25% for 25°F, and 30% for 20°F.

9

MXW Series Ratings All performance data is based on: 1. Coolant temperature rise of 10°F (5.6°C) 2. Cooler fouling factor of 0.0001 ft2 • hr • °F/Btu (0.000018 m3 • kW) 3. Condenser fouling factor of 0.00025 ft2 • hr • °F/Btu (0.000044 m3 • kW) 4. Subcooling of 10°F (5.6°C) 5. Refrigerant R-134A

Table 5 – MXW Series Cooling Capacities (60 Hz) - Continued

LCWT1

(°F) Model

Condenser Entering Water Temperature (°F)

80 85 90 95

Cap2 Input kW3

Cooler Flow Rate

(gpm)

Cond4

Flow Rate

(gpm)

Cap2 Input kW3

Cooler Flow Rate

(gpm)

Cond4

Flow Rate

(gpm)

Cap2 Input kW3

Cooler Flow Rate

(gpm)

Cond4

Flow Rate

(gpm)

Cap2 Input kW3

Cooler Flow Rate

(gpm)

Cond4

Flow Rate

(gpm)

46

MXW50 50.4 36.7 120.8 146.5 49.0 38.6 117.5 144.6 47.6 40.5 114.1 142.6 46.1 42.6 110.5 140.6

MXW75 70.7 49.9 169.4 204.4 68.8 52.4 164.9 201.8 66.9 55.1 160.3 199.1 64.9 58.0 155.5 196.5

MXW100 95.3 65.7 228.5 274.6 93.1 70.1 223.2 272.5 90.7 73.8 217.5 269.6 88.2 77.8 211.3 266.4

MXW125 119.7 85.9 286.9 347.0 116.7 90.1 279.7 343.1 113.6 94.6 272.4 339.2 110.5 99.6 264.9 335.3

48

MXW50 52.4 37.0 125.6 151.5 51.0 38.9 122.3 149.6 49.5 40.9 118.7 147.5 48.0 43.0 115.1 145.5

MXW75 73.5 50.3 176.2 211.5 71.6 52.8 171.6 208.7 69.6 55.5 166.8 206.0 67.5 58.4 161.9 203.3

MXW100 99.1 66.2 237.5 283.9 96.8 70.7 232.0 281.7 94.3 74.4 226.2 278.7 91.7 78.4 219.9 275.3

MXW125 124.4 86.7 298.2 358.9 121.3 91.0 290.9 354.8 118.2 95.5 283.4 350.7 114.9 100.5 275.6 346.7

50

MXW50 54.4 37.4 130.6 156.7 53.0 39.3 127.1 154.7 51.5 41.2 123.5 152.6 49.9 43.4 119.8 150.4

MXW75 76.4 50.7 183.3 218.7 74.4 53.3 178.5 215.9 72.4 56.0 173.6 213.1 70.3 58.9 168.5 210.2

MXW100 102.8 66.8 246.7 293.4 100.5 71.2 241.0 291.1 98.0 75.0 235.0 287.9 95.3 79.0 228.5 284.4

MXW125 129.2 87.6 309.9 371.2 126.0 91.9 302.4 366.8 122.8 96.5 294.6 362.6 119.5 101.5 286.6 358.4

55

MXW50 59.8 38.3 143.6 170.3 58.3 40.2 139.9 168.1 56.7 42.2 136.0 165.7 55.0 44.4 132.0 163.3

MXW75 84.0 51.8 201.6 237.8 81.9 54.5 196.5 234.7 79.7 57.3 191.2 231.6 77.4 60.2 185.9 228.4

MXW100 113.4 68.5 272.1 320.0 111.1 72.9 266.7 317.8 108.2 76.7 259.8 313.8 105.9 79.7 254.3 310.6

MXW125 141.8 89.9 340.5 403.2 138.4 94.2 332.4 398.4 135.0 98.9 324.1 393.6 131.4 104.0 315.5 389.0

60

MXW50 65.6 39.3 157.5 184.8 63.9 41.2 153.5 182.3 62.2 43.3 149.3 179.7 60.4 45.4 145.1 177.1

MXW75 92.1 53.1 221.1 258.1 89.8 55.8 215.7 254.7 87.5 58.7 210.1 251.3 85.1 61.7 204.3 247.9

MXW100 124.7 70.9 299.6 349.0 121.4 74.5 291.6 343.7 116.7 78.1 280.4 335.2 113.6 82.2 273.0 331.0

MXW125 155.3 92.3 373.0 437.3 151.7 96.7 364.4 432.0 163.5 104.5 392.8 466.3 158.6 109.7 381.0 458.5

65

MXW50 71.6 40.3 172.2 200.2 69.9 42.3 167.9 197.4 68.0 44.3 163.5 194.6 66.1 46.5 158.9 191.7

MXW75 100.6 54.4 241.9 279.7 98.2 57.3 236.1 276.1 95.7 60.2 230.1 272.3 94.3 63.5 226.6 271.4

MXW100 135.6 71.8 326.0 375.9 132.4 76.2 318.3 371.5 131.1 79.3 315.0 370.6 125.8 84.1 302.5 361.8

MXW125 173.1 95.5 416.0 482.2 168.3 99.8 404.6 474.2 163.5 104.5 393.0 466.3 158.6 109.7 381.2 458.5

70

MXW50 74.0 40.7 178.0 206.2 71.8 42.6 172.7 202.3 69.5 44.6 167.2 198.4 67.2 46.7 161.5 194.3

MXW75 103.5 54.9 248.9 286.9 100.5 57.7 241.7 281.8 97.4 60.5 234.3 276.6 94.3 63.5 226.7 271.4

MXW100 137.8 72.8 331.4 381.7 134.0 76.4 322.2 375.3 129.9 80.2 312.5 368.6 125.8 84.1 302.6 361.7

MXW125 173.1 95.5 416.2 482.2 168.3 99.8 404.8 474.2 163.5 104.5 393.3 466.3 158.6 109.7 381.5 458.5

75

MXW50 74.0 40.7 178.2 206.2 71.8 42.6 172.8 202.3 69.5 44.6 167.3 198.4 67.2 46.7 161.6 194.3

MXW75 103.5 54.9 249.1 286.9 100.5 57.7 241.8 281.8 97.4 60.5 234.4 276.6 94.3 63.5 226.9 271.4

MXW100 140.3 72.3 337.7 387.4 133.9 76.4 322.4 375.3 129.9 80.2 312.7 368.6 125.8 84.1 302.8 361.7

MXW125 173.1 95.5 416.5 482.2 168.3 99.8 405.1 474.2 163.5 104.5 393.5 466.3 158.6 109.7 381.8 458.5

Notes: 1. LCWT = Leaving Coolant Temperature 2. Cap = Capacity in tons of refrigeration 3. kW = Compressor motor input power at rated voltage 4. Cond = Condenser

10

MXR Series Ratings All performance data is based on: 1. Coolant temperature rise of 10°F (5.6°C) 2. Cooler fouling factor of 0.0001 ft2 • hr • °F/Btu (0.000018 m3 • kW) 3. Subcooling of 10°F (5.6°C) 4. Refrigerant R-134A

Table 6 – MXR Series Cooling Capacities (60 Hz)

LCWT1

(°F) Model

Condenser Entering Air Temperature (°F)

85 95 105 115

Cap2 Input kW3

Cooler Flow Rate

(gpm)

Cap2 Input kW3

Cooler Flow Rate

(gpm)

Cap2 Input kW3

Cooler Flow Rate

(gpm)

Cap2 Input kW3

Cooler Flow Rate

(gpm)

20

MXR50 26.8 34.7 71.3 24.9 38.3 66.2 22.8 42.5 60.5 20.5 47.6 54.4

MXR75 37.4 47.6 99.5 34.9 52.8 92.7 32.1 59.3 85.4 29.3 67.4 77.8

MXR100 51.0 62.5 135.6 47.9 69.8 127.3 44.5 78.0 118.3 40.9 87.3 108.6

MXR125 64.5 79.7 171.5 60.6 88.8 161.1 56.5 99.2 150.0 52.0 111.3 138.3

25

MXR50 30.3 35.7 78.8 28.2 39.4 73.4 25.9 43.8 67.4 23.4 48.9 60.9

MXR75 42.2 48.8 110.0 39.5 54.1 102.8 36.5 60.6 95.1 33.4 68.7 87.0

MXR100 57.3 64.5 149.2 53.9 71.9 140.4 50.2 80.2 130.7 46.2 89.6 120.3

MXR125 72.4 82.2 188.6 68.1 91.3 177.5 63.6 102.0 165.7 58.8 114.2 153.1

30

MXR50 33.9 36.8 86.7 31.6 40.6 80.9 29.1 45.1 74.6 26.5 50.4 67.7

MXR75 47.3 50.1 121.0 44.3 55.5 113.4 41.2 62.1 105.3 37.8 70.2 96.7

MXR100 64.0 66.6 163.7 60.3 74.1 154.1 56.2 82.4 143.8 51.8 91.9 132.6

MXR125 80.8 84.9 206.7 76.2 94.2 194.8 71.2 105.0 182.2 66.0 117.5 168.8

35

MXR50 37.7 38.0 94.9 35.3 42.0 88.8 32.6 46.6 82.1 29.7 52.0 74.8

MXR75 52.7 51.6 132.7 49.5 57.1 124.5 46.1 63.7 115.9 42.5 71.9 106.9

MXR100 71.1 68.8 179.0 67.1 76.3 168.7 62.6 84.8 157.6 57.8 94.4 145.5

MXR125 89.7 87.8 225.8 84.7 97.3 213.1 79.3 108.3 199.6 73.7 121.1 185.4

40

MXR50 42.1 39.5 100.8 39.4 43.5 94.4 36.5 48.3 87.4 33.4 53.7 79.9

MXR75 59.4 53.5 142.1 55.8 59.1 133.6 52.0 65.8 124.5 48.1 74.0 115.1

MXR100 80.9 71.7 193.6 76.2 79.4 182.4 71.2 88.0 170.4 65.8 97.7 157.4

MXR125 101.1 91.6 242.0 95.5 101.3 228.5 89.5 112.6 214.2 83.2 125.7 199.2

42

MXR50 43.7 40.0 104.8 41.0 44.1 98.1 38.0 48.9 91.0 34.8 54.4 83.3

MXR75 61.7 54.1 147.8 58.0 59.8 139.0 54.2 66.6 129.7 50.1 74.8 120.0

MXR100 84.0 72.7 201.2 79.2 80.4 189.6 74.0 89.1 177.2 68.4 98.8 163.8

MXR125 105.0 92.9 251.4 99.2 102.7 237.5 93.0 114.1 222.8 86.6 127.4 207.3

44

MXR50 45.4 40.6 108.8 42.6 44.7 102.0 39.5 49.5 94.6 36.2 55.1 86.7

MXR75 64.1 54.8 153.5 60.3 60.6 144.5 56.3 67.4 135.0 52.2 75.7 125.0

MXR100 87.2 73.7 209.0 82.2 81.4 197.0 76.9 90.1 184.2 71.1 99.9 170.4

MXR125 108.9 94.2 261.0 103.0 104.1 246.7 96.7 115.7 231.6 90.0 129.1 215.7

46

MXR50 47.1 41.2 113.0 44.2 45.4 105.9 41.0 50.2 98.4 37.6 55.8 90.2

MXR75 66.5 55.6 159.4 62.6 61.4 150.1 58.6 68.2 140.4 54.3 76.6 130.1

MXR100 90.5 74.6 216.9 85.3 82.5 204.6 79.8 91.2 191.3 73.9 101.1 177.1

MXR125 113.0 95.6 270.9 106.9 105.7 256.1 100.4 117.4 240.6 93.5 130.9 224.2

48

MXR50 48.9 41.8 117.2 45.9 46.0 110.0 42.6 50.9 102.2 39.1 56.6 93.8

MXR75 69.0 56.3 165.5 65.0 62.2 155.9 60.8 69.1 145.9 56.4 77.5 135.3

MXR100 93.8 75.7 225.0 88.5 83.6 212.3 82.8 92.4 198.6 76.7 102.3 183.9

MXR125 117.2 97.0 281.0 110.8 107.2 265.8 104.2 119.1 249.8 97.1 132.8 232.9

50

MXR50 50.6 42.4 121.5 47.6 46.7 114.1 44.2 51.6 106.1 40.6 57.3 97.5

MXR75 71.5 57.1 171.6 67.5 63.0 161.8 63.1 70.1 151.5 58.6 78.5 140.6

MXR100 97.3 76.7 233.3 91.8 84.7 220.1 85.9 93.5 206.0 79.6 103.5 190.9

MXR125 121.4 98.5 291.3 114.9 108.9 275.6 108.0 120.9 259.2 100.8 134.8 241.9

Notes: 1. LCWT = Leaving Coolant Temperature 2. Cap = Capacity in tons of refrigeration 3. kW = Compressor motor input power at rated voltage 4. = Requires antifreeze protection of system fluid. See Application Consideration section for more details. Capacities, energy use, and flows based

upon ethylene glycol solutions as follows based on Leaving Coolant Temperature: 15% for 35°F, 20% for 30°F, 25% for 25°F, and 30% for 20°F.

11

MXR Series Ratings All performance data is based on: 1. Coolant temperature rise of 10°F (5.6°C) 2. Cooler fouling factor of 0.0001 ft2 • hr • °F/Btu (0.000018 m3 • kW) 3. Subcooling of 10°F (5.6°C) 4. Refrigerant R-134A

Table 6 – MXR Series Cooling Capacities (60 Hz) - Continued

LCWT1

(°F) Model

Condenser Entering Air Temperature (°F)

85 95 105 115

Cap2 Input kW3

Cooler Flow Rate

(gpm)

Cap2 Input kW3

Cooler Flow Rate

(gpm)

Cap2 Input kW3

Cooler Flow Rate

(gpm)

Cap2 Input kW3

Cooler Flow Rate

(gpm)

55

MXR50 55.3 44.0 132.6 51.9 48.4 124.7 48.4 53.5 116.1 44.5 59.3 106.9

MXR75 78.1 59.3 187.6 73.8 65.4 177.1 69.2 72.6 166.0 64.3 81.2 154.5

MXR100 106.1 79.5 254.8 100.2 87.6 240.5 93.9 96.6 225.3 87.1 106.7 209.0

MXR125 132.5 102.5 318.0 125.5 113.2 301.2 118.1 125.6 283.6 110.4 140.0 265.1

60

MXR50 60.1 45.8 144.3 56.5 50.3 135.8 52.7 55.5 126.6 48.6 61.3 116.8

MXR75 85.1 61.7 204.4 80.4 68.0 193.1 75.5 75.3 181.3 70.4 84.1 169.0

MXR100 115.5 82.5 277.4 109.1 90.7 262.0 102.2 99.9 245.6 95.0 110.2 228.1

MXR125 144.1 106.8 346.2 136.7 117.9 328.3 128.8 130.7 309.4 120.6 145.6 289.7

65

MXR50 65.2 47.7 156.6 61.3 52.3 147.4 56.6 57.3 136.1 51.7 62.9 124.2

MXR75 92.4 64.3 222.0 87.2 70.8 209.7 81.1 77.9 195.0 74.9 86.5 180.0

MXR100 124.6 85.4 299.4 116.6 93.4 280.4 108.3 102.4 260.4 99.6 112.3 239.5

MXR125 156.4 111.4 375.9 147.5 122.6 354.5 137.8 135.3 331.3 127.9 149.8 307.3

70

MXR50 65.9 47.9 158.4 61.4 52.3 147.6 56.6 57.3 136.2 51.7 62.9 124.2

MXR75 93.2 64.6 224.1 87.2 70.8 209.8 81.1 77.9 195.2 74.9 86.5 180.1

MXR100 124.6 85.4 299.6 116.6 93.4 280.5 108.3 102.4 260.5 99.6 112.3 239.6

MXR125 156.8 111.6 377.2 147.5 122.6 354.7 137.8 135.3 331.5 127.9 149.8 307.5

75

MXR50 65.9 47.9 158.5 61.4 52.3 147.7 56.6 57.3 136.3 51.7 62.9 124.3

MXR75 93.2 64.6 224.2 87.2 70.8 210.0 81.1 77.9 195.3 74.9 86.5 180.2

MXR100 124.6 85.4 299.8 116.6 93.4 280.7 108.3 102.4 260.7 99.6 112.3 239.8

MXR125 156.8 111.6 377.5 147.5 122.6 355.0 137.8 135.3 331.7 127.9 149.8 307.7 Notes: 1. LCWT = Leaving Coolant Temperature 2. Cap = Capacity in tons of refrigeration 3. kW = Compressor motor input power at rated voltage

12

Weight & Dimension Drawings Figure 1 – MXW50 Water-Cooled Condenser Chiller Weights & Dimensions Drawing

14

0.1

6[3

56

0]

3 IN

CH

CH

ILLE

D

WA

TE

R O

UT

LE

T

3 IN

CH

CO

ND

EN

SE

R

WA

TE

R O

UT

LE

T

65.76[1670]

38.55[979]

18.75[476]

8.63[219]

35

.93

[913

]

22

.00

[559

]

3 IN

CH

CH

ILLE

D

WA

TE

R IN

LE

T

1. D

IME

NS

ION

S A

RE

IN

IN

CH

ES

[M

ILLIM

ET

ER

S].

SH

IPP

ING

WE

IGH

T:

2,9

65

LB

S. (1

,345 K

G)

OP

ER

AT

ING

WE

IGH

T:

3,1

45

LB

S. (1

,427 K

G)

NO

TE

S:

42

.00

[106

7]

42

.00

[106

7]

3 IN

CH

CO

ND

EN

SE

R

WA

TE

R IN

LE

T

27

.38

[695

]

80.25[2038]

13

Figure 2 – MXW75 Water-Cooled Condenser Chiller Weights & Dimensions Drawing

42

.00

[10

67

]

14

1.5

8

[35

96

]

65.76

[1670]

38.55

[979]

35

.93

[91

3]

22

.00

[55

9]

18.75

[476]

8.62

[219]

4 I

NC

H C

ON

DE

NS

ER

WA

TE

R I

NLE

T

4 IN

CH

CH

ILLE

D

WA

TE

R O

UT

LE

T

4 I

NC

H C

ON

DE

NS

ER

WA

TE

R O

UT

LE

T

4 IN

CH

CH

ILLE

D

WA

TE

R I

NLE

T

1.

DIM

EN

SIO

NS

AR

E I

N I

NC

HE

S [M

ILL

IME

TE

RS

].

SH

IPP

ING

WE

IGH

T: 3

,91

5 L

BS

. (1

,77

6 K

G)

OP

ER

AT

ING

WE

IGH

T:

4,0

95

LB

S. (1

,858

KG

)

NO

TE

S:

80.25

[2038]

42

.00

[10

67

]

27

.38

[69

5]

14


1. D

IME

NS

ION

S A

RE

IN

IN

CH

ES

[M

ILLIM

ET

ER

S].

SH

IPP

ING

WE

IGH

T: 4,3

15

LB

S. (1

,957 K

G)

OP

ER

AT

ING

WE

IGH

T: 4

,57

5 L

BS

. (2

,075 K

G)

NO

TE

S:

14

6.5

4

[37

22]

[91

3]

35

.93

22

.00

[55

9]

[476]

18.75

8.62

[219]

[979]

38.55

4 IN

CH

CO

ND

EN

SE

R

WA

TE

R IN

LE

T

[10

67]

42

.00

4 IN

CH

CH

ILLE

D

WA

TE

R O

UT

LE

T

4 IN

CH

CO

ND

EN

SE

R

WA

TE

R O

UT

LE

T

67.01

[1702]

4 IN

CH

CH

ILLE

D

WA

TE

R IN

LE

T

[69

5]

27

.38

[10

67]

42

.00

80.25

[2038]

15


14

8.0

0

[37

59

]

42

.00

[10

67

]

67.01

[1702]38.55

[979]

19.37

[492]9.25

[235]

35

.93

[91

3]

22

.00

[55

9]

42

.00

[10

67

]

4 I

NC

H C

ON

DE

NS

ER

WA

TE

R I

NL

ET

27

.38

[69

5]

1.

DIM

EN

SIO

NS

AR

E I

N I

NC

HE

S [

MIL

LIM

ET

ER

S].

SH

IPP

ING

WE

IGH

T:

5,0

20

LB

S.

(2,2

77

KG

)

OP

ER

AT

ING

WE

IGH

T:

5,3

30

LB

S.

(2,4

18

KG

)

NO

TE

S:

4 I

NC

H C

HIL

LE

D

WA

TE

R I

NL

ET

4 I

NC

H C

ON

DE

NS

ER

WA

TE

R O

UT

LE

T

4 I

NC

H C

HIL

LE

D

WA

TE

R O

UT

LE

T

80.25

[2038]

16

Figure 5 – MXR50 Remote Air Cooled Condenser Chiller Weights & Dimensions Drawing

1.

DIM

EN

SIO

NS

AR

E I

N I

NC

HE

S [

MIL

LIM

ET

ER

S].

SH

IPP

ING

WE

IGH

T:

2,4

95 L

BS

. (1

,13

2 K

G)

OP

ER

AT

ING

WE

IGH

T: 2

,620

LB

S.

(1,1

88 K

G)

3 I

NC

H C

HIL

LE

D W

AT

ER

IN

LE

T

1 3

/8 I

NC

H L

IQU

ID L

INE

13

3.6

3

[33

94]

42.0

0

[10

67]

65.76

[1670]

35.9

3

[913]

22.0

0

[559]

38.55

[979]

22.21

[564]

18.75

[476]

2 1

/8 IN

CH

DIS

CH

AR

GE

LIN

E

3 I

NC

H C

HIL

LE

D

WA

TE

R O

UT

LE

T

80.25

[2038]

27.3

8

[695]

42.0

0

[10

67]

NO

TE

S:

17


1.

DIM

EN

SIO

NS

AR

E I

N I

NC

HE

S [

MIL

LIM

ET

ER

S].

SH

IPP

ING

WE

IGH

T:

3,3

40

LB

S.

(1,5

15

KG

)

OP

ER

AT

ING

WE

IGH

T:

3,5

10

LB

S. (1

,59

2 K

G)

NO

TE

S:

65.76

[1670]

22

.00

35

.93

[91

3]

[55

9]

1 5

/8 I

NC

H L

IQU

ID L

INE

18.49

21.46

[545]

[470]

38.55

[979]

2 5

/8 I

NC

H

DIS

CH

AR

GE

LIN

E

42

.00

[10

67

]

4 I

NC

H C

HIL

LE

D

WA

TE

R I

NL

ET

4 I

NC

H C

HIL

LE

D

WA

TE

R O

UT

LE

T

[69

5]

27

.38

[10

67

]

42

.00

80.25

[34

70

]

13

6.6

1

[2038]

18


42

.00

[10

67]

13

6.6

9[3

47

2]

67.01[1702]

38.55[979]

21.46[545]

18.48[470]

35

.93

[91

3]

22

.00

[55

9]

42

.00

[10

67]

2 1

/8 I

NC

H L

IQU

ID L

INE

27

.38

[69

5]

4 I

NC

H C

HIL

LE

D

WA

TE

R I

NLE

T

1.

DIM

EN

SIO

NS

AR

E I

N I

NC

HE

S [

MIL

LIM

ET

ER

S].

SH

IPP

ING

WE

IGH

T:

3,4

85

LB

S.

(1,5

81 K

G)

OP

ER

AT

ING

WE

IGH

T:

3,7

10

LB

S.

(1,6

83 K

G)

NO

TE

S:

2 5

/8 I

NC

H

DIS

CH

AR

GE

LIN

E

4 I

NC

H C

HIL

LE

D

WA

TE

R O

UT

LE

T

80.25[2038]

19


42

.00

[10

67

]

13

6.6

9

[34

72

]67.01

[1702]

38.55

[979]20.69

[525]

20.33

[516]

35

.93

[91

3]

22

.00

[55

9]

27

.38

[69

5]

2 1

/8 I

NC

H L

IQU

ID L

INE42

.00

[10

67

]

4 I

NC

H C

HIL

LE

D W

AT

ER

IN

LE

T

1.

DIM

EN

SIO

NS

AR

E I

N I

NC

HE

S [

MIL

LIM

ET

ER

S].

SH

IPP

ING

WE

IGH

T:

3,7

00

LB

S.

(1,6

78

KG

)

OP

ER

AT

ING

WE

IGH

T:

3,9

80

LB

S.

(1,8

05

KG

)

NO

TE

S:

3 1

/8 I

NC

H

DIS

CH

AR

GE

LIN

E

4 I

NC

H C

HIL

LE

D

WA

TE

R O

UT

LE

T

80.25

[2038]

20

Figure 9 – MXR50 Remote Condenser Model LAVF14412 Weight & Dimensions Drawing

10

8.0

00

[2743

.20]

10

8.0

00

[2743

.20]

22

0.0

00

[5588

.00]

41

.250

[1047

.75]

45

.250

[1149

.35]

3.1

25

" In

let

3.1

25

" O

utle

t

No

tes:

1.

Dim

en

sio

ns a

re in inch

es [

mm

]

2.

Moun

tin

g h

ole

s a

re 0

.750 inch

es

Sh

ipp

ing W

eig

ht:

1,6

00

Lb

s (

726 K

g)

23

4.0

00

[5943

.60]

22.000

[558.80]

Co

ntr

ol P

an

el

56.500

[1435.51]

21


41

.250

[1047

.70]

45

.250

[1149

.30]

10

8.0

00

[2743

.07]

10

8.0

00

[2743

.07]

10

8.0

00

[2743

.07]

32

8.0

00

[8330

.80]

Co

ntr

ol P

an

el

3.1

25

" O

utle

t

3.1

25

" In

let

No

tes:

1.

Dim

en

sio

ns a

re in inch

es [

mm

]

2.

Moun

tin

g h

ole

s a

re 0

.750 inch

es

Sh

ipp

ing W

eig

ht:

2,8

10

Lb

s (

1,2

75 K

g)

34

2.0

00

[8686

.39]

22.000

[558.77]

61.000

[1549.77]

22


23

4.0

00

[5942

.92]

10

8.0

00

[2743

.18]

10

8.0

00

[2743

.18]

22

0.0

00

[5587

.96]

86

.500

[2197

.08]

90

.500

[2298

.68]

Co

ntr

ol P

an

el

3.1

25

" O

utle

t

3.1

25

" In

let

No

tes:

1.

Dim

en

sio

ns a

re in inch

es [

mm

]

2.

Moun

tin

g h

ole

s a

re 0

.750 inch

es

Sh

ipp

ing W

eig

ht:

2,8

85

Lb

s (

1,3

09 K

g)

23


86

.500

[2197

.10]

90

.500

[2298

.70]

22.000

[558.80]

58.500

[1485.90]

10

8.0

00

[2743

.20]

54

.000

[1371

.60]

10

8.0

00

[2743

.20]

27

4.0

00

[6959

.60]

28

9.2

50

[7346

.95]

Co

ntr

ol P

an

el

3.1

25

" O

utle

t

3.1

25

" In

let

No

tes:

1.

Dim

en

sio

ns a

re in inch

es [

mm

]

2.

Moun

tin

g h

ole

s a

re 0

.750 inch

es

Sh

ipp

ing W

eig

ht:

4,0

50

Lb

s (

1,8

37 K

g)

24

Application Considerations The following sections describe various application topics that are important for many industrial cooling system designs. As is the case with all chilled water system designs, we recommend the use of care to ensure proper review and accounting for all aspects of the system operating extremes. Care and planning at the time of system configuration and design will ensure a chilled water system design that is stable and reliable in meeting the demands process cooling needs.

Unit Location The chiller should be located indoors in an area where the temperature is maintained between 30°F (-1.1°C) and 110°F (43.3°C) on a stable surface. Level the unit to ensure proper operation. Use care when considering the overall location of the equipment in regards to accessibility. Follow proper acoustic design practices to ensure the unit is not located in a sound-sensitive area unless appropriate noise abatement is present.

Evaporator Fluid Temperature The chiller operates with a variety of different supply and return temperatures. The standard operating range for the fluid is 20°F (-6.7°C) to 80°F (26.7°C) with a minimum entering coolant temperature of 25°F (-3.9°C). The unit can start and pull down with up to 100°F (37.8°C) entering fluid temperature due to MOP (maximum operating pressure) feature of the expansion valve. This is for initial pull down of a reservoir or process fluid loop on start-up. Under normal operation, we recommended the entering water temperature not exceed 90°F (32.2°C).

Evaporator Flow The standard unit ratings and performance in this publication are for a coolant temperature rise of 10°F. The chiller is capable of operating with different operating temperature differentials provided certain flow limitations be meet and correction to capacity, pressure drops, and other operating parameters occur. The minimum flow rates are required to prevent fouling and to ensure the chiller stays within normal refrigerant operating conditions. The fouling factor used to calculate the ratings of the evaporators are 0.00010 Ft

2 • Hr • °F/Btu (0.000018 M

2 • kW).

If the process flow requirement is lower than the minimum flow limitation shown in Table 7 – Cooler Flow Rate Limitations, multiple smaller chillers may be used. Another alternative is to use a primary pumping loop designed for lower flow at a higher temperature rise through the process and a secondary pumping loop designed for a higher flow and lower temperature drop through the chiller. If a secondary pumping loop is used, the mixed temperature of coolant entering the

evaporator must be a minimum of at least 5°F above the set point of the chiller. The maximum flow limitation shown in Table 7 – Cooler Flow Rate Limitations is the theoretical limits of the chiller based upon a 5°F (2.8°C) drop across the cooler; however, these flows result in impractical pressure drops through the cooler and are therefore not likely for a system design. If the process flow requirement is higher than the maximum flow limitation shown in Table 7, a bypass around the chiller may be used. Another alternative is to use a primary pumping loop designed for higher flow and lower temperature rise through the process and a secondary pumping loop designed for lower flow and higher temperature drop through the chiller. If a secondary pumping loop is used, maintain the mixed temperature of coolant entering the cooler at a minimum of at least 5°F (2.8°C) above the set point of the chiller. The use of varying cooler flows is sometimes necessary; however, it is highly recommended to use a dedicated evaporator circulation pump to provide increased system stability. The controls of the chiller are very adaptable and are capable of adjusting to variations in the flow of water through the system and will load and unload compressor(s) as needed to maintain tight control of the leaving water temperature of the system. If the cooler flow is varied, the minimum fluid loop volume must be in excess of 3 gallons of coolant per ton of cooling (3.2 L per kW) and the flow rate must change at a rate of no greater than 10% per minute in order to maintain an acceptable level of temperature control. This is a practical amount

Table 7 – Cooler Flow Rate Limitations

Chiller Model Minimum Flow Maximum Flow

gpm (lpm) psi (kPA) gpm (lpm) psi (kPA)

MXW50 62 (235) 1.9 (13.1) 250 (946) 31.4 (216.5)

MXW75 88 (333) 1.9 (13.1) 350 (1325) 30.0 (206.8)

MXW100 118 (447) 2.5 (17.2) 470 (1779) 39.7 (273.7)

MXW125 148 (560) 2.6 (17.9) 592 (2241) 42.2 (291.0)

MXR50 56 (212) 1.6 (11.0) 224 (848) 25.2 (173.7)

MXR75 78 (295) 1.5 (10.3) 312 (1181) 23.8 (164.1)

MXR100 105 (397) 2.0 (13.8) 420 (1590) 31.7 (218.6)

MXR125 133 (503) 2.1 (14.5) 532 (2014) 34.1 (235.1)

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of water which typically buffers fluctuations in the process enough that the chiller will generally see fairly gradual rates of change in the inlet water temperature and will be able to accurately load or unload the compressor(s) which in turn will allow for very consistent and stable supply temperatures to the process. It is recommended to use a system volume of 6 to 10 gallons of coolant per ton (6.4 to 10.8 L per kW) if the flow rate changes more rapidly than 10% per minute. If the chiller sees a net rates of change greater than 10% per minute it may result in temporary supply temperature fluctuations greater than 1°F (0.56°C).

Note: Do not use the chilled water pump to stop the chiller. Turn the chiller off and continue circulating water through the evaporator for at least 30 seconds after the chiller is turn off before stopping the evaporator flow.

Condenser Water Temperature & Flow (Water-Cooled Units) All water-cooled condenser chillers have a factory mounted and wired electronic condenser water regulating valve that will regulate the flow of condenser water to maintain the proper refrigerant pressures. The minimum flow rates are required to prevent fouling and to ensure the chiller stays within normal refrigerant operating conditions. The fouling factor used to calculate the ratings of the condensers are 0.00025 Ft

2 • Hr • °F/Btu (0.000044 M

2 • kW).

The maximum flow rates shown in Table 8 – Water Cooled Condenser Flow Rate Limitations are within the practical pressure drop limitations of the condenser. The chiller will start and operate with an inlet water temperature between 55°F (12.8°C) and 105°F (40.6°C). The actual flow requirements will vary.

The condenser water-regulating valve is a modulating type butterfly valve located in the condenser water piping at the outlet of the condenser. The chiller controls the valve actuator using a high-side refrigerant pressure signal from a pressure transducer. The valve regulates the flow of water through the condenser in order to maintain the refrigerant pressure set point. The pressure set point is set at the factory to maintain 135 psig (930.8 kPA) based on the design inlet temperature of 85°F (29.4°C). The valve only passes as much water as is required to maintain the refrigerant pressure, so less water will be required if the water temperature is lower than the design 85°F (29.4°C). The chillers have a wide operating range for the condenser water supplied to them to operate in a variety of different systems with varying tower water temperatures. The chiller controls and the standard condenser water-regulating valve maximize the flexibility of the chiller while ensuring dependable operation over a broad range of loads by allowing the chiller to adjust to changing condenser water temperatures. Lowering the condenser water supply temperature below 85°F (29.4°C) is an effective way to reduce the overall cooling system input power requirements. The added cost of increased cooling tower size, cooling tower fan hp, and pump hp can offset the energy savings realized by lowering the condensing temperatures in the chiller. There are practical limits to this trade-off, so we recommend a careful evaluation to determine what system design makes the most sense for each application. Please contact your system provider for more information.

Condenser Air Temperature (Remote Air-Cooled Units) All remote air-cooled condenser chillers have a factory selected remote air-cooled condenser that specifically meets the needs of the chiller module to which it is connected. The remote condenser has fan cycling and a variable speed fan to maintain the proper refrigerant pressures. The chiller is designed to allow the unit to start and operate with an inlet air temperature range between -20°F (-28.9°C) and 110°F (43.3°C). The minimum ambient air temperature at which the chiller can be started is -20°F (-28.9°C) based on still air.

System Fluid Freeze Protection For applications where system fluid will be exposed to ambient conditions of 32°F (0°C) or colder and/or the set point of the system will be below 40°F (4.4°C), antifreeze must be added to the system fluid to protect the chiller and system piping from potential damage. The amount of antifreeze will vary depending on the actual desired operating conditions and should enough to provide freeze protection to temperatures 15°F (8.3°C) colder than the coldest temperature anticipated. Use only antifreeze solutions designed for heat exchanger duty. We do not recommend the use of automotive antifreeze because it has the potential for fouling that can occur once its relatively short-lived inhibitors break down.

Table 8 – Water Cooled Condenser Flow Rate Limitations

Chiller Model

Minimum Flow Maximum Flow

gpm (lpm) psi (kPA) gpm (lpm) psi (kPA)

MXW50 22 (83) 0.1 (0.7) 221 (837) 10.6 (73.1)

MXW75 29 (110) 0.1 (0.7) 295 (1117) 9.0 (62.1)

MXW100 32 (121) 0.1 (0.7) 403 (1526) 20.0 (137.9)

MXW125 43 (163) 0.2 (1.4) 487 (1844) 21.1 (145.5)

26

Over-sizing Chillers Over-sizing chillers sometimes occurs to allow for future growth. While this practice may be necessary, it is highly recommended not to oversize chillers by more than 15% at design conditions to avoid unwanted reductions in system efficiency and excessive electrical power use and/or compressor cycling due to reduced chiller loading. If the system design requires prolonged periods of operating at reduced loads, we recommend considering using two smaller chillers. Operating smaller chillers at higher loads is preferred to operating one larger chiller at or near its minimum load capacity.

Strainers Each evaporator has a 20-mesh inlet strainer to protect the evaporator. Filter all water-cooled condensers with a minimum of a 20 mesh filtering system to protect the condenser from contamination.

Remote Condenser Selection

The MX Series of chillers using remote air-cooled condensers are provided from the factory with a properly sized and selected remote condenser so there is no need for a separate remote condenser selection. For installation and line size guidelines please referrer to the separate Remote Air-Cooled Condenser Installation Guidelines Manual.

27

Evaporator and Condenser Pressure Drop Figure 13 – Evaporator Coolant Pressure Drop Curves

0

5

10

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20

25

30

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40

45

0 100 200 300 400 500 600 700

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ssu

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rop

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si)

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MXW75 & MXR75

MXW100 & MXR100

MXW125 & MXR125

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Figure 14 – Condenser Water Pressure Drop Curves

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MXW100

MXW125

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