Liebert ITR User Manual

Liebert® Challenger™ ITR

Installation Manual - Nominal Capacities 23 or 33 kW, 50 & 60Hz

Precision Cooling
For Business-Critical Continuity™

TABLE OF CONTENTS

1.0 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

1.1 System Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

1.1.1 Self Contained Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

1.1.2 Chilled Water Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

1.1.3 Split Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

2.0 INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

2.1 Room Preparation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

2.2 Equipment Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

2.3 Location Considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

2.3.1 Remote Sensor Installation Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

2.4 Equipment Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

2.4.1 Handling With Skid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2.4.2 Removal of Skid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2.5 Piping Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2.5.1 Drain Line . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2.6 Electrical Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

2.7 Balancing the Air Distribution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

2.7.1 Ducted Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

2.7.2 Plenum Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

2.8 Checklist for Completed Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

3.0 AIR-COOLED MODELS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

3.1 Condenser Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

3.2 Electrical Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

3.2.1 Line Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

3.2.2 Low Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

3.2.3 Lee-Temp/Flood Back Head Pressure Control Condensers . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

3.3 Refrigerant Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

3.4 Fan Speed Control Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

3.4.1 Materials Supplied . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

3.4.2 Dehydration/Leak Test and Charging Procedures for R22 (standard) or R407C (Optional) . 18

3.4.3 Charging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

3.5 Lee-Temp/Flood Back Head Pressure Control Systems. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

3.5.1 Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

3.5.2 Materials Supplied . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

3.5.3 Dehydration/Leak Test and Charging Procedures for R22 (Standard) or R407C (Optional). 21

3.5.4 Charging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

4.0 WATER-COOLED MODELS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24

4.1 Piping Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

4.2 Condenser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

4.3 Water Regulating Valve. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

4.3.1 Water Regulating Valve Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

4.3.2 Water Regulating Valve Manual Flushing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

4.3.3 Testing Valve Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

5.0 GLYCOL/GLYCOOL-COOLED MODELS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27

5.1 Drycooler Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

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5.2 Drycooler Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

5.3 Electrical Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

5.3.1 Line Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

5.3.2 Low Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

5.3.3 Pump and Drycooler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

5.4 Glycol Piping. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

5.4.1 Expansion Tanks, Fluid Relief Valves and Other Devices. . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

5.5 Filling Instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

5.5.1 Preparing the System for Filling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

5.5.2 Glycol Solutions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

5.5.3 Filling the System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

5.6 Condenser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

5.7 Glycol Regulating Valve. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

5.7.1 Glycol Regulating Valve Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

5.7.2 Testing Valve Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

6.0 CHILLED WATER MODELS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37

6.1 Piping Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

7.0 SPLIT SYSTEM MODELS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

7.1 Location Considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

7.1.1 Air-Cooled Condensing Units. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

7.1.2 Water/Glycol-Cooled Condensing Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

7.2 Electrical Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

7.2.1 Line Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

7.2.2 Low Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

7.3 Piping Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

7.3.1 Refrigerant Loop. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

7.3.2 Quick Connect Fittings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

7.4 Outdoor Air-Cooled Condensing Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

7.5 Centrifugal Air-Cooled Condensing Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

7.5.1 Installing the Indoor Condensing Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

7.5.2 Ducting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

7.6 Water and Glycol-Cooled Condensing Units. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

7.6.1 Piping Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

7.6.2 Condenser Water Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

7.6.3 Regulating Valve Adjustment and Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

7.6.4 Glycol Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

8.0 R407C REFRIGERANT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56

8.1 Calculating Subcooling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

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FIGURES

Figure 1 Removing Liebert Challenger ITR from skid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Figure 2 Cabinet dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Figure 3 Optional floor stand dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Figure 4 Piping connections for air-cooled units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Figure 5 Piping connections for split system fan coil units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Figure 6 Piping connections for water/glycol and GLYCOOL units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Figure 7 Piping connections for chilled water self-contained units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Figure 8 Electrical connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Figure 9 Air-cooled condensers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Figure 10 Air-cooled fan speed control general arrangement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Figure 11 Air-cooled, Lee-Temp general arrangement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Figure 12 Water-cooled general arrangement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Figure 13 Johnson Controls valve adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Figure 14 Drycoolers and pump packages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Figure 15 Pump packages—expansion tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Figure 16 Glycol general arrangement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Figure 17 GLYCOOL general arrangement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Figure 18 Chilled water general arrangement - horizontal flow (BR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Figure 19 Refrigerant piping diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Figure 20 Outdoor air-cooled condensing unit—horizontal air discharge models . . . . . . . . . . . . . . . . . . . . . 43

Figure 21 Outdoor air-cooled condensing unit—top air discharge models . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Figure 22 Electrical field connections, prop fan condensing module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

Figure 23 Detail of ceiling hanging bracket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

Figure 24 Centrifugal air-cooled condensing unit dimensional data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Figure 25 Centrifugal air-cooled condensing unit dimensional data (con't.) . . . . . . . . . . . . . . . . . . . . . . . . . 51

Figure 26 Split systems general arrangement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Figure 27 Water/glycol-cooled condensing unit dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

Figure 28 Water/glycol-cooled condensing unit (con't.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

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TABLES

Table 1 Unit shipping weights. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Table 2 Piping connection size. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Table 3 Air-cooled condenser statistics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Table 4 Recommended line sizes — OD copper (inches)* . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Table 5 Equivalent lengths (feet) for various pipe fittings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Table 6 Indoor unit refrigerant charge lb (kg) R22 or R407C (per unit serial tag) . . . . . . . . . . . . . . . . . . 17

Table 7 Line charges - refrigerant per 100 ft (30 m) of Type “L” copper tube. . . . . . . . . . . . . . . . . . . . . . . 17

Table 8 Condenser refrigerant (per serial tag) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Table 9 Refrigerant control settings psi (kPa) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Table 10 Refrigerant control settings psi (kPa) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Table 11 Room dew point temperatures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Table 12 Indoor unit glycol volume approximate gallons (liters) max. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Table 13 Volume in standard Type “L” copper piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Table 14 Ethylene glycol concentrations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Table 15 Mounting hole dimensional data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Table 16 Drycooler data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Table 17 Glycol pump data* . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Table 18 Refrigerant control settings psi (kPa) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Table 19 Unit refrigerant charge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Table 20 Line charges - refrigerant per 100 ft (30 m) of Type “L” copper tube. . . . . . . . . . . . . . . . . . . . . . . 40

Table 21 Recommended refrigerant lines (R22 or R407C) sizes OD copper . . . . . . . . . . . . . . . . . . . . . . . . . 40

Table 22 Line coupling sizes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Table 23 Equivalent lengths (feet) for various pipe fittings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Table 24 Horizontal air discharge cabinet and floor planning dimensional data. . . . . . . . . . . . . . . . . . . . . 44

Table 25 Horizontal air discharge piping and electrical connection data . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Table 26 Cabinet and floor planning dimensional data - prop fan condensing modules, top

air discharge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Table 27 Piping and electrical connections - top air discharge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Table 28 Indoor centrifugal condensing unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Table 29 Airflow CFM (CMH) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

Table 30 Water and glycol-cooled unit connection sizes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Table 31 Water and glycol-cooled condensing unit data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Table 32 R407C pressure/temperature chart for operation and superheat (discharge/hot gas

and suction gas). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

Table 33 R407C pressure/temperature chart for subcooling only (liquid measurements). . . . . . . . . . . . . . 57

iv

1.0 INTRODUCTION

1.1 System Descriptions

Liebert Challenger ITR™ environmental control systems are available in three main system configu­rations:

• self contained system with a scroll compressor in the room unit

• self contained chilled water system

• split system with an evaporator section and a remote condensing unit

All three types are available in horizontal flow configurations. Each model requires three-phase
power. Units are available in 208, 230, 460, or 575 V, 60 Hz; and 200, 230 or 380/415 V, 50 Hz.

The following features are included as standard in all room units regardless of the type of system:
V-frame coil, infrared humidifier, finned tubular stainless steel electric reheat, 2" filter, individual
high voltage fused protection, and fan assembly.

Each configuration can operate with either Advanced Microprocessor Controls (A), or Advanced
Microprocessor Controls with Graphics (G). A brief description of each, including operational differ­ences, is listed below. Check model numbers to see what is supplied with your unit.

1.1.1 Self Contained Systems

Air-Cooled Models

Complete refrigeration system including hot gas bypass and crankcase heater with standard con­denser and fan speed control for 95°F (35°C) ambient at sea level.

Introduction

Water-Cooled Models

Compete refrigeration system including hot gas bypass with water/glycol-cooled condenser and two­way water regulating valve with bypass.

Glycol-Cooled Models

The water-cooled model as described above plus pump package and 95°F (35°C) design ambient dry­cooler.

GLYCOOL Models

Complete refrigeration system including hot gas bypass with glycol condenser and three-way water reg­ulating valve plus an integrally piped Econ-O-Coil with three-way modulating control valve.

1.1.2 Chilled Water Models

Chilled Water models include chilled water piping, three-way modulating valve and actuator assembly.

1.1.3 Split Systems

Each Air-Cooled split system consists of an evaporator section and one of the following condensing units.

Prop Fan

Includes scroll compressor, condenser coil, prop fan, high pressure switch, and Lee-Temp head pres­sure control. Unit is designed for outdoor location.

Centrifugal Fan

Includes scroll compressor, condenser coil, centrifugal blower assembly, high pressure switch, head
pressure control valve, Lee-Temp receiver and liquid line solenoid valve. Unit must be mounted
indoors. Duct flanges are optional.

Water/Glycol Condensing Units

Each water-cooled split system consists of an evaporator section and a water/glycol condensing unit,
which includes scroll compressor, coaxial condenser, water regulating valve, and high pressure switch.
Design pressure is 150 psi (1034 kPa) as standard and 350 psi (2413 kPa) as optional.

Each glycol-cooled split system consists of an evaporator section, a water/glycol condensing unit (as
described above), a pump package and a 95°F (35°C) design ambient drycooler.

1

2.0 INSTALLATION

!

2.1 Room Preparation

The room should be well insulated and must have a sealed vapor barrier. The vapor barrier in the
ceiling can be a polyethylene film type. Use a rubber or plastic base paint on concrete walls and floors.
Doors should not be undercut or have grilles in them.

Outside (or fresh) air should be kept to an absolute minimum. Outside air adds to the heating, cool­ing, humidifying and dehumidifying loads of the site. It is recommended that outside air be kept
below 5% of the total air circulated in the room and be preconditioned.

2.2 Equipment Inspection

Upon arrival of the unit, inspect all items for visible and concealed damage. Damage should be imme­diately reported to the carrier and a damage claim filed with a copy sent to Liebert or to your sales
representative.

2.3 Location Considerations

The Liebert Challenger ITR can sit on top of an accessible elevated flooring system. It may be neces­sary to furnish additional pedestal support below the unit to ensure maximum structural support (see
Table 1). A separate floor stand for the unit may be used as support, independent of the elevated floor
and installed prior to the flooring system.

Provide approximately 34" (864 mm) service clearance in the front and rear of the unit.

The unit can be installed between equipment racks or at the end of a row of racks. Consideration
should be given before installing refrigerant and liquid lines next to, under or above electronic equip­ment. Avoid placing the Liebert Challenger ITR in an alcove. Placing units too close together will
reduce the effectiveness of the air distribution.

Installation

NOTE

Locate and remove shipping screw on fan motor base.

2.3.1 Remote Sensor Installation Location

The remote temperature and humidity sensor should be installed in the cold aisle in front of the
equipment to be cooled. It should be mounted at the farthest point from the cooling unit that supply
air needs to reach but still within the unit's area of influence. The sensor should be installed at the
highest point that equipment will draw in cooled air.

2.4 Equipment Handling

WARNING

Risk of equipment tipping over. Can cause damage, injury or death.
The instructions listed below must be adhered to when handling this unit with or without the

skid. There is the potential for this unit to tip over if handled improperly.

2

2.4.1 Handling With Skid

Remove plywood skirting holding
unit and skid in place.

Raise unit with fork lift
or similar machine.

• Always keep the Liebert Challenger ITR upright, indoors and protected from damage.

• Do not use the extended rear door frame to lift the unit.

• If possible, transport the unit using a fork lift; otherwise, use a crane with belts or cables, avoid­ing pressing on the top edges of the packaging.

• If using a fork lift, make sure that the forks, if adjustable, are spread to the widest allowable dis­tance to still fit under the skid.

NOTICE

Do not attempt to lift the Liebert Challenger ITR with the extended rear door frame.
Attempting to do so will damage the unit. Lift the unit only from its main base.

NOTICE

While on the skid, the Liebert Challenger ITR is too tall to fit through a standard height
doorway (83 inches or 2108 mm tall). Any attempt to move the unit, while on the skid,
through a standard doorway will damage the unit.

2.4.2 Removal of Skid

1. Remove the plywood skirting that keeps the skid and unit in place.

2. Raise the Liebert Challenger ITR off the skid. Liebert recommends using a fork lift (see Figure 1)
or similar machine to ensure that the unit is lifted properly.

Installation

NOTE

Lift the Liebert Challenger ITR only from its main base. Do not use the extended rear door
frame to lift the unit.

3. Once the unit is raised, the skid can be removed.

Figure 1 Removing Liebert Challenger ITR from skid

Table 1 Unit shipping weights

Domestic Export

Model

BR059E 650 (295) 750 (340) BR060E 650 (295) 750 (340)
BR065A 745 (340) 845 (385) BR067A 745 (340) 845 (385)
BR070WG 815 (370) 915 (415) BR071WG 815 (370) 915 (415)
BM058G 855 (390) 955 (435) BM061G 855 (390) 955 (435)
BR101C 660 (300) 760 (345) BR102C 660 (300) 760 (345)

lb (kg) lb (kg) lb (kg) lb (kg)

50Hz Models 60Hz Models

Model

3

Domestic Export

Figure 2 Cabinet dimensions

DPN001523
Pg. 2, Rev. 1

Filter Access
by Opening Door

UNIT
TOP VIEW

32-1/2"
(826mm)

5/8"

(16mm)

9-5/8"

(244mm)

8-1/2"

(216mm)

31-1/2"

(800mm)

1-7/8"

(48mm)

12-1/2"

(318mm)

30-1/2"

(775mm)

30-1/2"

(775mm)

32-1/2"

(826mm)

32-1/2"

(826mm)

1-5/8"

(41mm)

13"

(330mm)

Projection of
Display Bezel

Standard Piping Location

45-1/8"

(1147mm)

5-1/2"

(140mm)

15-1/16"

(382mm)

76"

(1930mm)

91-1/16"

(2313mm)

Blower Outlet with
1" (25.4mm) Flange

Shaded area indicates
a recommended
clearance of 34" (864mm)
for component access

Shaded area indicates a recommended
clearance of 34" (864mm) for component access

UNIT DIMENSIONAL DATA
FRONT VIEW

UNIT DIMENSIONAL DATA
REAR VIEW

10-1/4"

(260mm)

7/8" (22.2mm) Flange for
Duct or Plenum Connection

43-5/16"

(1100mm)

11- 3/ 4"

(298mm)

Remove Blocker Panel
for Air Discharge Left
and/or Right Side Panels

Standard Electrical Outlet
Location Through Unit

12-5/8"

(321mm)

Discharge Air Opening

Plenum Overhang

Unit Weight

50 Hz Models 60 Hz Models lb. (kg)

BR059E BR060E 649 (294)

BR065A BR067A 744 (337)

BR070WG BR071WG 814 (369)

BR101C BR102C 659 (299)

BM058G BM061G 854 (387)

Installation

4

Figure 3 Optional floor stand dimensions

30-1/2"

(775mm)

30-1/2"

(775mm)

1"

(25.4mm)

See Specification Sheet
for height of floor stand ordered.

SL-11897
Pg. 7

Installation

5

2.5 Piping Considerations

Consideration should be given before installing refrigerant and liquid lines next to, under or above
electronic equipment.

2.5.1 Drain Line

A 3/4" (19.1 mm) female pipe thread (FPT) connection is provided for the evaporator coil condensate
drain. This drain line also drains the humidifier, if applicable. The drain line must be located so it will
not be exposed to freezing temperatures. The drain should be at least the full size of the drain connec­tion and pitched a minimum of 1/8" per ft. (11 mm per meter).

NOTE

This line may contain boiling water. Select appropriate drain system materials.

The Challenger ITR comes standard with a condensate pump will require a field-supplied trap
downstream from the pump. The drain line must comply with all applicable codes.

Table 2 Piping connection size

Air-Cooled Unit Connection Sizes—in.

Model No. BR/BM

60Hz (50Hz)

067A (065A) 1/2 7/8

Split System Fan Coil Unit Connection Sizes—in.

Model No. BR/BM

60Hz (50 Hz)

Liquid Line O.D. Copper

L

Liquid Line

L

Installation

Hot Gas Line O.D. Copper

HG

Suction Line

SC

060E (059E) 1/2 O.D. Cu 1-1/8 O.D. Cu

All Units: Connection Sizes—in.

Humidifier Line

O.D. Copper

H

1/4 1/2 OD Cu 1/2

Water/Glycol-Cooled Unit Connection Sizes—in.

Model No. BR/BM

60Hz (50 Hz)

071WG (070WG) 1-1/8 1-1/8

GLYCOOL Unit Connection Sizes —in.

Model No. BR/BM

60Hz (50 Hz)

061G (058G) 1-1/8 1-1/8

Chilled Water Unit Connection Sizes—in.

Model No. BR/BM

60Hz (50 Hz)

102C (101C) 1-1/8 1-1/8

Condensate

Drain Line

C

Supply Line

S

Supply Line

S

Supply Line

CWS

Condensate Pump Line

O.D. Copper

P

Return Line

Return Line

Return Line

CWR

Hot Water Reheat

O.D. Copper

Supply HWS Return HWR

5/8 5/8

R

R

6

Figure 4 Piping connections for air-cooled units

Piping outlet locations through the
plenum are the same as the unit.
See below for descriptions and
connection sizes.

Hot Water Return
5/8" OD CU (optional)

Hot Water Supply
5/8" OD CU (optional)

Liquid Refrigerant Line
1/2" OD CU on Models BR067A/BR065A

Humidifier Water
Supply Line 1/4" OD CU

Hot Gas Refrigerant Line
7/8" OD CU on Models
BR067A/BR065A

Condensate Pump
Line 1/2" OD CU

Monitoring Panel

PIPING OUTLET LOCATIONS

(See Cabinet and Floor Planning

Dimensional Data for Piping

Opening Sizes.)

DPN001525
REV 0

Installation

7

Figure 5 Piping connections for split system fan coil units

Piping outlet locations through the
plenum are the same as the unit.
See below for descriptions and
connection sizes.

Hot Water Supply
5/8" OD CU (optional)

Condensate Pump Line
1/2" OD CU

PIPING OUTLET LOCATIONS

(See Cabinet and Floor Planning

Dimensional Data for Piping

Opening Sizes.)

Hot Water Return
5/8" OD CU (optional)

Liquid Refrigerant Line
1/2" OD CU on Models
BR060E/BR059E

Humidifier Water Supply Line
1/4" OD CU

Suction Refrigerant Line
1 1/8" OD CU on
Models BR060E/BR059E

Monitoring Panel

DPN001534
REV 0

Installation

8

Figure 6 Piping connections for water/glycol and GLYCOOL units

Piping outlet locations through the
plenum are the same as the unit.
See below for descriptions and
connection sizes.

Hot Water Supply
5/8" OD CU (optional)

Condensate Pump Line
1/2" OD CU

PIPING OUTLET LOCATIONS

(See Cabinet and Floor Planning

Dimensional Data for Piping

Opening Sizes.)

Hot Water Return
5/8" OD CU (optional)

Condenser Supply Line
1-1/8" OD CU on
Models BR071WG/BR070WG

Humidifier Water Supply Line
1/4" OD CU

Condenser Return Line
1 1/8" OD CU on
Models BR071WG/BR070WG

DPN001528
REV 0

Monitoring Panel

Installation

9

Figure 7 Piping connections for chilled water self-contained units

Piping outlet locations through
the plenum are the same as the
unit. See below for descriptions
and connection sizes.

Hot Water Return
5/8" OD CU (optional)

Chilled Water Return Line
1-1/8" OD CU

Hot Water Supply
5/8" OD CU (optional)

Humidifier Water Supply
Line 1/4" OD CU

Chilled Water Supply Line
1-1/8" OD CU

Condensate Pump Line
1/2" OD CU

Monitoring Panel

PIPING OUTLET LOCATIONS

(See Cabinet and Floor Planning

Dimensional Data for Piping

Opening Sizes.)

DPN001531
REV 0

Installation

10

2.6 Electrical Connections

!

757682

83 84 85 88 899192 93 94 95 96

97 1

37C 38C 37B 37 38 24 50 51 55 56

77 78

4

7

2

3

4

5

71

70

15

6

11

13

12

17

16

14

1310

9

8

8

9

1

1

2338B

Terminal Block*
(for customer connections)

Electrical Handy Box*

(factory-installed with cover)

DPN001524
REV 0

Three-phase electrical service is required for all models in either 208, 230, 460, or 575 V, 60 Hz; or
200, 230, or 380/415 V, 50 Hz. Electrical service shall conform to national and local electrical codes.
Refer to equipment nameplate regarding wire size and circuit protection requirements. Refer to elec­trical schematic when making connections.

A manual electrical disconnect switch should be installed within 5 feet (1.6 m) of the Liebert Chal­lenger ITR in accordance with codes. A factory-supplied, locking disconnect switch is factory-mounted
within the unit behind the front door.

WARNING

Risk of electric shock. Can cause injury or death.
Disconnect all local and remote electric power before working within the unit. Use a voltmeter

to make sure power is turned off before making any electrical connections.

NOTICE

Three-phase power must be connected to the Liebert Challenger ITR line voltage terminals in
the proper sequence so that scroll the compressor rotates in the proper direction.

Figure 8 Electrical connections

Installation

1. Electric conduit knockouts on top and bottom of electric box. Knockout size 1-3/4" (44.5mm).

2. Three phase connection. Electric service connection terminals when factory disconnect switch
is supplied.

3. Factory-installed locking disconnect switch.

4. Three-phase electric service not by Liebert.

5. Earth ground connection (50/60Hz). Connection terminal for field-supplied earth grounding wire.

6. Earth ground bar (50Hz only). Connection terminals with factory ground from each high
voltage component for field supplied earth grounding wire.

7. Control and monitoring section of electric box.

8. Remote unit shutdown. Replace existing jumper between Terminals 37 + 38 with normally
closed switch having a minimum 75VA, 24VAC rating. Use field-supplied Class 1 wiring. Two
additional contact pairs available as an option (labeled as 37B & 38B, 37C & 38C). Replace
existing jumper for appropriate pair as done for 37 & 38.

11

Installation

9. Special alarm connections. Field-supplied 24V Class 1 wiring for special alarm. Connection
made by adding normally open contacts between terminals 24 + 50. Optional additional
connections available with Advanced or Advanced with Graphics controls and appropriate
optional accessories (connections 51, 55, and 56).

10. Liebert SiteScan
pair, communication cable (available from Liebert or others) to optional Liebert SiteScan.

11. Remote condensing unit connection. Field-supplied 24V Class 1 wiring to remote condensing
unit terminals 1, 2, 3, & 4 from (R2) relay (split system only).

12. Smoke detector alarm connections. Field-supplied 24V Class 1 wiring to remote alarm circuits.
Factory-wired contacts from optional smoke detector are #91-comm., #92-NO, and #93-NC.

13. Common alarm connection. Field-supplied 24V Class 1 wiring to common alarm terminals 75 + 76
(and optional 94 + 95, and 96 + 97), which are factory-connected to common alarm relay (R3).

14. Reheat and Humidifier Lockout. Optional emergency power lockout of reheat and/or humidifier:
connections provided for remote 24V AC source.

15. Heat rejection connection. Field-supplied 24V Class 1 wiring to interlock heat rejection from
pigtails 70 + 71 which are factory-connected to compressor side switch (self-contained units only
and to Glycool relay (R5), Glycool units only).

16. Main Fan Auxiliary Switch. Optional main fan auxiliary side switch. Terminals located in field
wiring compartment for remote indication that the evaporator fan motor/unit is on. Field to
connect 24V maximum.

17. Optional Condensate Alarm (Dual Float Condensate Pump only). Relay terminals located in field
wiring compartment for remote indication.

®

connection. Terminals 77 (-) and 78 (+) are for connection of a 2-wire, twisted

*Located inside Liebert Challenger ITR on top.

NOTE: Refer to specification sheet for full load amp. and wire size amp. ratings.

2.7 Balancing the Air Distribution

2.7.1 Ducted Applications

For ducted applications, the duct work may be attached to the top perimeter of the Liebert Challenger
ITR (see Figure 2).

The duct work must allow access to the motors/blowers for maintenance. The duct work must be
designed within the capacity of the Liebert Challenger ITR, otherwise air flow and performance will
be compromised.

2.7.2 Plenum Installation

A solid plenum or plenum with discharge grille(s) may be installed. The plenum and instructions for
its installation ship separately from the Liebert Challenger ITR.

12

2.8 Checklist for Completed Installation

___ 1. Unpack and check received material.

___ 2. Proper clearance for service access has been maintained around the equipment.

___ 3. Equipment is level and mounting fasteners are tight.

___ 4. Piping completed to refrigerant or coolant loop (if required). Piping has been leak checked,

evacuated and charged (if required).

___ 5. Check piping within the Liebert Challenger ITR and outside of the unit. Remove potential of

rub-through or chaffing.

___ 6. Condensate pump installed.

___ 7. Drain line connected.

___ 8. Water supply line connected to humidifier (if required).

___ 9. Field provided pan with drain installed under all ceiling mounted fluid condensing units (if

installed).

___ 10. Ducting completed (if applicable).

___ 11. Filter(s) installed.

___ 12. Line voltage to power wiring matches equipment serial tag.

___ 13. Power wiring connections completed between disconnect switch, evaporator and condensing

unit, including earth ground.

___ 14. Power line circuit breakers or fuses have proper ratings for equipment installed.

___ 15. Control wiring connections completed to evaporator and condensing unit.

___ 16. Verify water detection is properly installed around all units (if installed).

___ 17. All wiring connections are tight.

___ 18. Control panel DIP switches set based on customer requirements.

___ 19. Foreign materials have been removed from, in and around all equipment installed (literature,

shipping materials, construction materials, tools, etc.).

___ 20. Fans and blowers rotate freely.

___ 21. Inspect all piping connections for leaks during initial operations. Correct as needed.

___ 22. Verify that a blank start-up sheet has been sent with the unit(s) and is ready to be completed

by the installer.

Installation

13

3.0 AIR-COOLED MODELS

!

3.1 Condenser Location

The air-cooled condenser should be located for maximum security and maintenance accessibility.
Avoid ground level sites with public access or areas that contribute to heavy snow or ice accumula­tions. Utilize centrifugal condensers whenever interior building locations must by used. To assure
adequate air supply, it is recommended that condensers be located in a clean air area, away from
loose dirt and foreign matter that may clog the coil. In addition, condensers should not be located in
the vicinity of steam, hot air, or fume exhausts. Also, condensers should be located no closer than
three feet (1 meter) from a wall, obstruction, or adjacent unit.

Install condensers in a level position to assure proper refrigerant flow and oil return. For roof instal­lation, mount condensers on steel supports in accordance with local codes. To minimize sound and
vibration transmission, mount steel supports across load bearing walls. For ground installation, a
concrete pad will provide adequate support. Condenser legs have mounting holes for securing the con­denser to the steel supports or concrete pad.

3.2 Electrical Connections

Refer to equipment nameplate regarding wire size and circuit protection requirements. Refer to elec­trical schematic when making connections. Make all wiring and electrical connection in accordance
with local and national codes.

WARNING

Risk of electric shock. Can cause injury or death.
Disconnect all local and remote electric power before working within the unit. Use a voltmeter

to make sure power is turned off before making any electrical connections.

Air-Cooled Models

3.2.1 Line Voltage

Line voltage electrical service is required for all air-cooled condensers at the location of the condenser.
This power supply does not have to be the same voltage as the indoor unit. This separate power source
may be 208, 230, 460, or 575 V, 60 Hz; or 200, 230, or 380/415 V, 50 Hz. The disconnect switch may be
factory-supplied and mounted in the electrical panel or field-supplied and mounted per local and
national codes.

3.2.2 Low Voltage

A control interlock between the condenser and the indoor unit is required and is connected between
70 and 71 in the handy box of the indoor unit and the electric panel of the air-cooled condenser. NEC
Class 1 wiring is required.

3.2.3 Lee-Temp/Flood Back Head Pressure Control Condensers

Lee-Temp condensers require a separate power supply for the heated receivers. This power supply is
connected to the electrical connection box on the end of the receiver.

14

Figure 9 Air-cooled condensers

Secure each leg to condenser frame at all
points shown using hardware provided.

Liquid line

* B

TYPICAL FOOTPRINT

Lee-Temp heater pad
connection box

*B - Inverted traps are to be field-supplied and installed
(typ). When installing traps, provide clearance for swing
end of access door. Traps are to extend above base of
coil by a minimum of 7-1/2" (190 mm)

Liquid line

Hot gas line

Electric service
supplied by
others

Electric
service
supplied by
others

Hot gas
line

* B

LEE-TEMP CONDENSER

FAN SPEED CONDENSER

44"

(1118mm )

18" (457.2mm)

43-9/16"

(1106mm)

51-7/16"

(1306.5mm)

37-7/8"

(962mm)

Common to all models. See Table 3
below for key to “A” dimension.

CONDENSER MOUNTING

1"

(25.4mm)

1-3/4"

(44.5mm)

4-1/4"

(108mm)

4-1/4"

(108mm)

1-3/4"

(44.5mm)

1"

(25.4mm)

1-3/4"

(44.5mm)

1" typ.

(25.4mm)

1-3/4"

(44.5mm)

37-11/16"

(957.3mm)

1-3/4"

(44.5mm)

A

9/16" (14.3mm)
diameter holes
8 places for
1/2" (12.7mm)
diameter bolts

43-3/16"

(1097mm)

SINGLE FAN

AIR-COOLED CONDENSERS

1" typ.

(25.4mm)

Air-Cooled Models

Table 3 Air-cooled condenser statistics

Model

083 1 7/8 5/8 295 (133.8) 42 (1067)

104 1 1-1/8 5/8 315 (142.8) 42 (1067)

Number

of Fans

Connection Sizes

(OD Copper)

Net Weight

“A” Dimension

lb (kg)

15

in (mm)Hot Gas (in.) Liquid (in.)

3.3 Refrigerant Piping

All refrigeration piping should be installed with high temperature brazed joints. Prevailing good
refrigeration practices should be employed for piping supports, leak testing, dehydration and charg­ing of the refrigeration circuits.

Unit refrigeration components and piping are shipped from the factory with a nitrogen holding
charge.

NOTE

The refrigeration piping should be isolated from the building by the use of vibration isolating
supports.

NOTE

Piping, including inverted trap(s), must be routed to allow unobstructed access to the panel
per the NEC.

NOTE

When installing field piping, care must be taken to protect all refrigerant lines from the
atmosphere, especially when using refrigerants with POE oils. Do not allow the piping to stand
open to air for more than 15 minutes. Units designed for R407C have a compressor that
contains POE oil that is very hygroscopic; that is, it quickly absorbs water from the air. The
longer the compressor piping is left open to air, the harder it will be to fully evacuate. If left
open too long, the POE oil may need to be replaced before achieving the required vacuum level.

Air-Cooled Models

NOTE

Keep the evaporator unit and condenser closed with their factory charge of dry nitrogen while
all field piping is installed. Keep the field piping clean and dry during installation, and do not
allow it to stand open to the atmosphere. When all the field interconnecting piping is in place,
vent the condenser dry nitrogen charge and connect to the field piping. Finally, vent the
evaporator unit dry nitrogen charge and make its piping connections last.

Follow all proper brazing practices including a dry nitrogen purge to maintain system
cleanliness.

Traps should be installed in the hot gas line on vertical risers at the base and every 25 feet (7.6
meters) in elevation. These traps will collect condensed refrigerant and refrigerant oil during the off
cycle of the unit and ensure flow of refrigerant oil during operation.

A check valve is factory-supplied with the unit to be field-installed on the discharge side of the scroll
compressor. Be sure to install the check valve with the refrigerant flow in the proper direction. When
soldering or brazing the valve, it is very important to protect the internal parts by wrapping the valve
with a damp cloth to keep the valve temperature below 250°F (121°C).

Approval is required whenever:

• a refrigerant piping run exceeds 150 ft. (46 m) equivalent length

• an R22 system condenser must be located more than 15 ft. (4.6 m) below the level of the cooling
coil

• an R407C system condenser must be located below the level of the cooling coil.

Total discharge line pressure drop must not exceed 10 PSIG (69 kPa).

Consult your local Liebert representative when considering installations outside these guidelines.

Table 4 Recommended line sizes — OD copper (inches)*

23 & 33 kW 067A (065A)

Equivalent Length

50 ft. (15 m) 7/8 1/2
100 ft. (30 m) 7/8 5/8
150 ft. (45 m) 7/8 5/8

*Recommended vertical line sizes must be used for proper oil return at all cooling and dehumidification steps.

Hot Gas Line Liquid Line

16

Table 5 Equivalent lengths (feet) for various pipe fittings

Copper Pipe

O.D. in.

1/2 0.8 1.3 0.4 2.5 0.26 7.0 4.0
5/8 0.9 1.4 0.5 2.5 0.28 9.5 5.0
3/4 1.0 1.5 0.6 2.5 0.3 12.0 6.5

7/8 1.45 1.8 0.8 3.6 0.36 17.2 9.5
1-1/8 1.85 2.2 1.0 4.6 0.48 22.5 12.0
1-3/8 2.4 2.9 1.3 6.4 0.65 32.0 16.0
1-5/8 2.9 3.5 1.6 7.2 0.72 36.0 19.5

Refrigerant trap = 4 times equivalent length of pipe per this table.

90 Degree

Elbow Copper

90 Degree

Elbow Cast

45 Degree

Elbow Tee

Gate

Valve

Globe

Valve

Angle

Valve

Table 6 Indoor unit refrigerant charge lb (kg) R22 or R407C (per unit serial tag)

R22 R407C

Model

67A/65A 1.5 (0.68) 1.4 (0.6)

Approximate Charge

lb (kg)

Approximate Charge

lb (kg)

Table 7 Line charges - refrigerant per 100 ft (30 m) of Type “L” copper tube

R22 R407C

O.D.

Liquid Line

lb (kg)

Hot Gas Line

lbs (kg)

Liquid Line

lb (kg)

Hot Gas Line

lb (kg)

Air-Cooled Models

1/2" 7.3 (3.3) 1.3 (0.6) 6.9 (2.9) -

5/8" 11.7 (5.3) 2.1 (1.0) 11.0 (4.6) 2.2 (0.9)

3/4" 16.6 (7.5) 3.0 (1.4) 15.7 (6.5) 3.1 (1.3)

7/8" 24.4 (11.1) 4.4 (2.0) 23.0 (9.6) 4.5 (1.9)

Table 8 Condenser refrigerant (per serial tag)

R22 R407C

Approximate Charge

lb (kg)

Model

Fan Speed Lee-Temp* Fan Speed Lee-Temp*

083 5 (2.27) 27 (12.3) 8 (3) 25 (12)

104 8 (3.63) 39 (17.7) 9 (4) 37 (17)

* Charge includes the receiver charge.

3.4 Fan Speed Control Systems

Fan Speed Control provides an infinite number of speed variations on specially designed, permanent
split-capacitor motors. The control module varies the air quantity passing over the condenser coil by
monitoring refrigerant pressure.

3.4.1 Materials Supplied

1. Built-in pre-wired condenser control box

2. Air-cooled condenser

3. Piping access cover to be reinstalled when piping is complete

4. Bolts (four per leg) 3/8" x 5/8"

5. Terminal block for two-wire, 24-volt interlock connection between unit and condenser

6. Condenser legs, four on one-fan models

Approximate Charge

lb (kg)

17

Air-Cooled Models

!

3.4.2 Dehydration/Leak Test and Charging Procedures for R22 (standard) or R407C (Optional)

Fan Speed Control Type Condenser

CAUTION

All local codes for handling refrigerant must be followed.

NOTE

As R22 and R407C are similar in properties, proper safety equipment and proper
refrigeration tools are required on both types. Check unit nameplate for correct refrigerant
type before topping off or recharging a system.

NOTE

Refrigerant R407C uses a POE (polyol ester) lubricant. The R407C refrigerant must be
introduced and charged from the cylinder only as a liquid.

NOTE

When installing field piping, care must be taken to protect all refrigerant lines from the
atmosphere, especially when using refrigerants with POE oils. Do not allow the piping to stand
open to air for more than 15 minutes. Units designed for R407C have a compressor which
contains POE oil that is very hygroscopic; that is, it quickly absorbs water from the air. The
longer the compressor piping is left open to air, the harder it will be to fully evacuate. If left
open too long, the POE oil may need to be replaced before achieving the required vacuum level.

Dehydration/Leak Test

1. Make sure unit is OFF. Open all disconnects and remove all fuses except control fuses. On units
supplied with circuit breakers, open all breakers except for the transformer.

2. Add a jumper to the Fan Safety Switch between Common and Normal Open and disconnect the
wire connected to the Normally Closed. Turn unit disconnect ON. (Fan operation not required.)

NOTE

The above allows the technician to use unit 24 VAC power and controls to open liquid line
solenoid valve(s) and hot gas bypass solenoid valve(s) for the dehydration process. If no
power is at the unit disconnect, the technician is to use a separate 24 VAC source rated at
75 VA and connect to the system liquid line solenoid valve(s) and hot gas bypass solenoid
valve(s) directly.

3. Connect refrigeration gauges to the suction and discharge service valves of the compressor. Open
all compressor service valves.

4. To energize the liquid line solenoid valves through the control system power, set the control
temperature setpoint (see operation manual) to 60°F (15°C) and set the % relative humidity
setpoint higher than the conditioned room ambient to ensure that solenoid valves and hot gas
bypass valves are open during the dehydration process.

5. Pressurize the system circuit(s) to 150 PSIG (1034 kPa) by using dry nitrogen with a trace of
refrigerant. Check system for leaks with suitable leak finder.

6. After completion of leak testing, release the test pressure (per local code) and pull a deep vacuum
on the system with a suitable pump.

7. After four hours, check the pressure readings, and if they have not changed, break vacuum with
refrigerant. Pull another vacuum to 250 microns or less. Recheck the pressure after two hours.
After completing this step, pressurize the circuits with refrigerant (R407C liquid or R22 vapor per
unit nameplate) until suction and discharge pressures have equalized.

18

Figure 10 Air-cooled fan speed control general arrangement

SL -11 89 7 PG 5

Con de nser
Co il

Sc hra de r
Va lv e

Fu si bl e
Pl ug

In ve rted Trap s* on disch ar ge
an d retu rn li ne s to ex te nd
ab ov e ba se of co il by a
mi ni mu m of 7 1 /2" (1 90 mm )

Tr ap s* ev er y
25 ft. (7.6 m)
of ris e

Ev ap or at or
Co il

Ex pa nsio n
Va lv e

Hot Ga s
Bypass
Va lv e

So le no id
Va lves

Si ght
Gl as s

Fi lt er
Dryer

Li qu id Ret ur n

Sh ut o ff *
Va lv e

Se ns in g
Bu lb

Ex ter na l
Eq ua li zers

Scr ol l
Co mp re ss or

Se rv ic e
Va lves

Hot Ga s
Bypass

Hot Ga s
Di sch ar ge

Che ck Va

lv e
(S hi pp ed Lo os e fo r
Fi el d I n st al la ti on )

SI NG LE CIRC UI T SH OW N

FA CT OR Y
PI PI NG

FI EL D
PI PI NG

*Comp on ent s ar e no t su pp li ed by Li eb ert bu t
ar e re co mm en d ed fo r pr op er ci rcui t op er at io n
an d ma in te na nc e.

Air-Cooled Models

19

3.4.3 Charging

1. Make sure unit is OFF. Open all disconnect switches and, on units supplied with circuit breakers,
open all breakers. Replace all fuses for the Fan and Compressors or close breakers.

2. Remove jumper on the Fan Safety Switch and reconnect the system wire connections. Ensure that
all operational components are clear of debris. Turn unit ON. (Fan operation is required.) Check
the evaporator fan for proper rotation and correct if necessary.

3. Connect the refrigerant gauge charging hose to the drum of refrigerant and to the suction and
discharge service valves of the compressor.

4. Calculate the amount of charge for the system. Weigh in as much of the system charge as
possible. Refer to the unit, condenser and refrigerant line charge tables.

5. Set the control temperature setpoint (see operation manual) to 60°F (15°C) and set the % relative
humidity setpoint higher than the conditioned room ambient to ensure that solenoid valves and
hot gas bypass valves are open during the charging procedure. You may have to bypass the
LP Switch (low pressure switch) to start the compressors and stop short cycling. Reset the Head
Pressure switch(es) if open.

6. Add refrigerant (R407C liquid, or R22 vapor per unit nameplate) to the suction side of the
compressor until there is sufficient pressure to energize the low-pressure switch.

NOTE

When adding refrigerant to an operating system, it may be necessary to add the refrigerant
through the compressor suction service valve. Because the refrigerant leaving the
refrigerant cylinder must be in a liquid state, care must be exercised to avoid damage to the
compressor. It is suggested that a sight glass be connected between the charging hose and
the compressor suction service valve. This will permit adjustment of the cylinder hand
valve so that liquid can leave the cylinder while allowing vapor to enter the compressor.

Air-Cooled Models

Then you may remove the manual bypass you applied earlier.

7. Charge the unit until the liquid line sight glass becomes clear. Then add one additional pound of
refrigerant.

8. As head pressure builds, the condenser fan starts rotating. The fan becomes fully energized when
sufficient head pressure is developed. (Fan starts to rotate at 190 psi and is full speed at 250 psi.)

Table 9 Refrigerant control settings psi (kPa)

Low Pressure

Cut Out

20 (137.9) 65 (448.2) 360 (2482)

Low Pressure

Cut In

High Pressure

Cut Out

3.5 Lee-Temp/Flood Back Head Pressure Control Systems

The Lee-Temp system consists of a modulating type head pressure control valve and insulated
receiver with heater pad to ensure operation at ambient temperatures as low as -30°F (-34.4°C).

3.5.1 Piping

Lee-Temp systems have two factory-supplied, field-installed check valves: one on the discharge side of
the scroll compressor and one on the inlet side of the receiver. Be sure to install the check valves with
the refrigerant flow in the proper direction. When soldering or brazing the valves, it is very important
that the internal parts be protected by wrapping the valve with a damp cloth to keep the valve tem­perature below 250°F (121°C).

20

3.5.2 Materials Supplied

!

1. Built-in pre-wired condenser control box

2. Air-cooled condenser

3. Piping access cover to be reinstalled when piping is complete

4. Bolts (four per leg) 3/8" x 5/8"

5. Terminal block for two-wire 24V interlock connection between the unit and the condenser

6. Condenser legs: four on one-fan models

7. Lee-Temp system:
a. Insulated storage receiver
b. Head pressure control valve with integral check valve
c. Adapter assembly
d. Rotalock valve
e. Pressure relief valve
f. Liquid level sight glass
g. Check valve

8. Bolts - (six per receiver) 3/8" x 1"

NOTE

Lee-Temp heater pad requires a separate, continuous electrical source of either 115 VAC or
200/208/230 VAC.

Air-Cooled Models

3.5.3 Dehydration/Leak Test and Charging Procedures for R22 (Standard) or R407C (Optional)

Lee-Temp Control Type Condenser

CAUTION

All local codes for handling refrigerant must be followed.

NOTE

As R22 and R407C are similar in properties, proper safety equipment and proper refrigeration
tools are required on both types. Check unit nameplate for correct refrigerant type and oil type
before topping off or recharging a system.

NOTE

Refrigerant R407C uses a POE (polyol ester) lubricant. The R407C refrigerant must be
introduced and charged from the cylinder only as a liquid.

NOTE

When installing field piping, care must be taken to protect all refrigerant lines from the
atmosphere, especially when using refrigerants with POE oils. Do not allow the piping to stand
open to air for more than 15 minutes. Units designed for R407C have a compressor which
contains POE oil that is very hygroscopic; that is, it quickly absorbs water from the air. The
longer the compressor piping is left open to air, the harder it will be to fully evacuate. If left
open too long, the POE oil may need to be replaced before achieving the required vacuum level.

21

Air-Cooled Models

Dehydration/Leak Test

1. Make sure unit is OFF. Open all disconnect switches and pull all fuses except control fuses. On
units supplied with circuit breakers, open all breakers except for the transformer.

2. Add a jumper to the Fan Safety Switch between Common and Normal Open and disconnect the
wire connected to the Normally Closed. Turn unit disconnect ON. (Fan operation not required.)

NOTE

The above allows the technician to use unit 24 VAC power and controls to open liquid line
solenoid valve(s) and hot gas bypass solenoid valve(s) for the dehydration process. If no power
is at the unit disconnect, the technician is to use a separate 24 VAC source rated at 75 VA and
connect to the system liquid line solenoid valve(s) and hot gas bypass solenoid valve(s) directly.

3. Connect refrigeration gauges to the suction and discharge service valves of the compressor and open.

4. Attach a “jumper” hose from the Rotalock fitting on the outlet of the receiver and the Schrader fitting
on the liquid header of the condenser. Front seat the Rotalock valve approximately two turns.

5. To energize the liquid line solenoid valve(s) through the control system, set the temperature
setpoint (see operation manual) to 60°F (15°C) and set the % relative humidity setpoint higher
than the conditioned room ambient to ensure that solenoid valves and hot gas bypass valves are
open during the dehydration process.

6. Pressurize system circuit(s) to 150 PSIG (1034 kPa) by using dry nitrogen with a trace of
refrigerant. Check system for leaks with suitable leak finder.

7. After completion of leak testing, release test pressure (per local code) and pull a vacuum on the
system.

8. After 4 hours, check pressure readings and, if they have not changed, break vacuum with
refrigerant. Pull a second and third vacuum of 250 microns or less. Recheck pressure after
2 hours.

3.5.4 Charging

1. Make sure unit is OFF. Open all disconnect switches and, on units supplied with circuit breakers,
open all breakers. Replace all fuses for the Fan and Compressors or close breakers.

2. Remove jumper on the Fan Safety Switch and reconnect the system wire connections. Ensure that
all operational components are clear of debris. Turn unit ON. (Fan operation is required.) Check
the evaporator fan for proper rotation and correct if necessary.

3. Connect the refrigerant gauge charging hose to the drum of refrigerant and to the suction and
discharge service valves of the compressor(s).

4. Calculate the amount of charge for the system. Weigh in as much of the system charge as
possible. Refer to the unit, condenser and refrigerant line charge tables.

5. Set the control temperature setpoint (see operation manual) to 60°F (15°C) and set the % relative
humidity setpoint higher than the conditioned room ambient to ensure that solenoid valves and
hot gas bypass valves are open during the charging procedure. You may have to bypass the
LP Switch (low pressure switch) to start the compressors and stop short cycling. Reset the Head
Pressure switch(es) if open.

6. Add refrigerant (R407C liquid or R22 vapor per unit nameplate) to the suction side of the
compressor until there is sufficient pressure to energize the low pressure switch.

NOTE

When adding refrigerant to an operating system, it may be necessary to add the refrigerant
through the compressor suction service valve. Because the refrigerant leaving the
refrigerant cylinder must be in a liquid state, care must be exercised to avoid damage to the
compressor. It is suggested that a sight glass be connected between the charging hose and
the compressor suction service valve. This will permit adjustment of the cylinder hand
valve so that liquid can leave the cylinder while allowing vapor to enter the compressor.

Then you may remove the manual bypass you applied earlier.

7. Charge the unit until the proper charge is weighed in.

Table 10 Refrigerant control settings psi (kPa)

Low Pressure Cut Out Low Pressure Cut In High Pressure Cut Out

20 (137.9) 65 (448.2) 360 (2482)

22

Figure 11 Air-cooled, Lee-Temp general arrangement

FACTOR

Y PIPING

FIELD PIPING

SINGLE CIRCUIT SHOWN

SL-10061 PG 4 SL-10071 PG 4

Piping Assembly * *

Condenser Coil

Rotalock Valve **

1/4" ( 6.4mm)
Pressure Relief
Valve * *

Sight Glass

Lee-Temp
Receiver

Head Pressure
Control with
Integral Check
Valve

Check Valve

Liquid Return
from Condenser

Inverted Trap * on
discharge line to
extend above base
of coil by a
minimum of 7 1/2"
(190mm)

Traps * Every
25 Ft. (7.6m)
of rise on Hot
Gas Line only

Evaporator Coil

Sensing Bulb

Expansion Valve

Hot Gas
Bypass
Valve

Solenoid Valves

Sight Glass

Filter Drier

Liquid Return

Shutoff
Valve *

External Equalizers

Service
Valves

Scroll Compressor

Hot Gas
Bypass

Hot Gas Discharge

Check Valve * *

* Components are not supplied by Liebert
but are recommended for proper
circuit operation and maintenance.

* * Components supplied by Liebert
and must be field installed.

OPTIONAL PIPING

Air-Cooled Models

23

4.0 WATER-COOLED MODELS

4.1 Piping Considerations

Manual shut-off valves should be installed at the supply and return lines of each unit. This will pro­vide for routine maintenance or emergency isolation of the unit.

When the water source for the condenser is of poor quality, it is good practice to provide cleanable fil­ters in the supply line. These filters will trap the particles in the water supply and extend the service
life of the water-cooled condenser.

To provide for the emergency of water leaks and the consequences of sub-floor flooding, floor drains
should be provided with wet traps or a water detection system such as a Liqui-tect sensor that is
installed near the base of the unit or below the elevated floor.

4.2 Condenser

The condenser is designed to operate in conjunction with either a cooling tower or city water. The
maximum water pressure is 150 psig (1034 kPa). A high pressure system rated at 350 psig (2413 kPa)
is available as an option.

Water-Cooled Models

24

Figure 12 Water-cooled general arrangement

SL-11898 PG 5

Evaporator
Coil

Expansion
Valve

Sensing
Bulb

External
Equalizers

Hot Gas
Bypass
Valve

Scroll
Compressor

Service
Valves

Hot Gas
Bypass
Solenoid
Valve

Sight
Glass

Filter
Drier

Hot Gas
Bypass

Tube
in Tube
Condenser

Bypass
Valve

2-Way Water
Regulating
Valve

3-Wa

y Water
Regulating Valve
(optional)

Fluid
Return
From
Unit

Fluid
Supply
To
Un

it

Fluid
Return
From
Unit

Fluid
Su

pply
To
Unit

Shutoff*
Valves

Hose Bibs*

FACTORY

PIPING
FIELD
PIPING

*Components are not supplied by Liebert but
are recommended for proper circuit operation
and maintenance.

Tube
in Tube
Condenser

Water-Cooled Models

25

4.3 Water Regulating Valve

Range
spring

Valve spring
guide

Top
retainer

Range adjustment screw

Insert screwdrivers underneath
the valve spring guide

The water regulating valve automatically regulates the amount of fluid necessary to remove the heat
from the refrigeration system, permitting more fluid to flow when load conditions are high and less
fluid to flow when load conditions are low. The valve consists of a brass body, balance spring, valve
seat, valve disc holders, capillary tube to discharge pressure, and adjusting screw.

4.3.1 Water Regulating Valve Adjustment

The Liebert Challenger ITR may be equipped with either a standard Johnson Controls valve, 150 psig
(1034 kPa) or with a high-pressure Johnson Controls valve, 350 psig (2413 kPa).

The valve may be adjusted with a standard refrigeration service valve wrench or screw driver.

To lower the head pressure setting, turn the square adjusting screw clockwise until the high pressure
gauge indicates the desired setting.

To raise the head pressure setting, turn the adjusting screw counterclockwise until the desired set­ting is obtained.

Figure 13 Johnson Controls valve adjustment

Water-Cooled Models

4.3.2 Water Regulating Valve Manual Flushing

The valve may be flushed by inserting screwdrivers or similar tools under the opposing sides of the
main spring and lifting. This action will open the valve seat and flush any dirt particles from the seat.
If this fails, the valve must be disassembled for cleaning the seat.

4.3.3 Testing Valve Function

When the refrigeration system has been off for 10-15 minutes, the water flow should stop.

Should the water continue to flow, the valve is either improperly adjusted or the pressure sensing
capillary is not properly connected to the condenser.

26

5.0 GLYCOL/GLYCOOL-COOLED MODELS

!

5.1 Drycooler Location

The drycooler should be located for maximum security and maintenance accessibility. Avoid ground­level sites with public access or areas which contribute to heavy snow or ice accumulations. To assure
adequate air supply, it is recommended that drycoolers be located in a clean air area, away from loose
dirt and foreign matter that may clog the coil. In addition, drycoolers should not be located in the
vicinity of steam, hot air or fume exhausts. Also, drycoolers should not be located closer than 3 feet
(1 meter) from a wall, obstruction or adjacent unit.

5.2 Drycooler Installation

For roof installation, mount drycoolers on steel supports in accordance with local codes. To minimize
sound and vibration transmission, mount steel supports across load bearing walls. For ground instal­lation, a concrete pad will provide adequate support. Drycooler legs have mounting holes for securing
the drycooler to steel supports or concrete pad.

5.3 Electrical Connections

Refer to equipment nameplate regarding wire size and circuit protection requirements. Refer to elec­trical schematic when making connections. Make all wiring and electrical connections in accordance
with local and national codes.

Glycol/GLYCOOL-Cooled Models

WARNING

Risk of electric shock. Can cause injury or death.
Disconnect all local and remote electric power before working within the unit. Use a voltmeter

to make sure power is turned off before making any electrical connections.

5.3.1 Line Voltage

Line voltage electrical service is required for all drycoolers at the location of the drycooler. This power
supply does not have to be the same voltage as the indoor unit. This separate power source may be
208, 230, 460, or 575 V, 60 Hz; or 200, 230, or 380/415 V, 50 Hz. The disconnect switch is factory-sup­plied and mounted in the electric panel.

5.3.2 Low Voltage

A control interlock between the drycooler and the indoor unit is required and is connected between 70
and 71 in the handy box of the indoor unit and the pump and drycooler control box of the drycooler.
NEC Class 1 wiring is required.

5.3.3 Pump and Drycooler

All wiring to the pump and drycooler from the control box should be done in accordance with the elec­trical schematic on the inside lid of the drycooler control box and with local and national codes.

27

5.4 Glycol Piping

NOTICE

Galvanized pipe must not be used in or with systems or units that contain glycol. The
phosphates in the inhibitor can react with the zinc in the galvanized pipe, precipitating an
insoluble material that can eventually foul the system.

To help prevent piping failures, supply and return lines must be supported in a way that
keeps their weight from bearing on the piping of the unit, drycooler or pumps.

To avoid the possibility of burst pipes, it is necessary to install a relief valve in the system.
This valve may be obtained from the supplier as an option or obtained from another vendor.

Fluid-cooled condensers have small internal flow passages. To avoid clogging and other
resulting system operation problems, install a 16-20 mesh filter in the fluid supply line to the
indoor unit. The filter should be located where it can be easily serviced or replaced.

Do not install unit on open-loop systems. Debris carried by the fluid will clog the brazed plate
condenser.

It is recommended that manual service shut-off valves be installed at the supply and return connec­tions to each unit. This enables routine service and/or emergency isolation of the unit. In addition,
multiple pump packages require a check valve at the discharge of each pump to prevent back flow
through the standby pump(s).

To facilitate filling, installation of hose bibs at the lowest point of the system is recommended.

Glycol/GLYCOOL-Cooled Models

Consideration of the minimum glycol temperature to be supplied from the drycooler will determine if
the need exists to insulate the glycol supply and return lines. Insulation will prevent condensation on
the glycol lines in low ambient conditions.

All fluid piping must comply with local codes. Care in sizing pipes will help reduce pumping power
and operating costs.

Table 11 Room dew point temperatures

Dry Bulb

°F (°C)

70 (21.1)
70 (21.1)

72 (22.2)
72 (22.2)

75 (23.8)
75 (23.8)

* Minimum glycol temperature before condensation will occur.

Wet Bulb

°F (°C)

57.2 (14.0)

58.5 (14.7)

58.9 (24.9)

60.0 (15.5)

61.2 (16.2)

62.5 (16.9)

Relative

Humidity

45
50

45
50

45
50

Dew Point*

°F (°C)

48.0 (8.9)

50.5 (10.3)

50.0 (10.0)

52.4 (11.3)

52.4 (11.3)

55.0 (12.7)

5.4.1 Expansion Tanks, Fluid Relief Valves and Other Devices

An expansion tank must be provided for expansion and contraction of the fluid due to temperature
change in this closed system. Vents are required at system high points to vent trapped air when fill­ing the system. A relief valve is a also a necessary piping component.

Depending on the complexity of the system, various other devices may be specified. Pressure gauges,
flow switches, automatic air separator, tempering valves, standby pumps, sensors for electrical con­trols, and flow switches are just a few of these devices.

NOTICE

Immediately following the use of water for leak testing or system cleaning, charge the tested
system with the proper percentage of glycol and water for the application’s coldest design
ambient. Complete system drain-down cannot be assured, and equipment damage could
result from freezing of residual water.

28

5.5 Filling Instructions

5.5.1 Preparing the System for Filling

It is important to remove any dirt, oil or metal filings that may contaminate the cooling system piping
in order to prevent contamination of the fresh glycol solution and fouling of the drycooler piping. The
system should be flushed thoroughly using a mild cleaning solution or high-quality water and then
completely drained before charging with glycol. Cleaning new systems is just as important as clean­ing old ones. New systems can be coated with oil or a protective film; dirt and scale are also common.
Any residual contaminants could adversely affect the heat transfer stability and performance of your
system. In many cases, in both old and new systems, special cleaners are needed to remove scale, rust
and hydrocarbon foulants from pipes, manifolds and passages. Clean heat transfer surfaces are
important in maintaining the integrity of the heating/cooling system. For more information on clean­ers and degreasers, contact your sales representative. Follow the manufacturer's instructions when
using these products.

Calculate the internal volume of the system as closely as possible. See Table 12 and Table 14 for
unit volumes. Use volume in Table 13 for glycol piping volumes.

Table 12 Indoor unit glycol volume approximate gallons (liters) max.

Model (50 Hz) Glycol-Cooled GLYCOOL

071WG/(070WG) 2.0 (7.5) —

061G/(058G) — 4.0 (15.1)

Glycol/GLYCOOL-Cooled Models

Table 13 Volume in standard Type “L” copper piping

Diameter (in.) Volume

Outside Inside Gal/Ft L/M

1/2 0.123 0.008 (0.01)

5/8 0.555 0.012 (0.15)

3/4 0.666 0.018 (0.22)

7/8 0.785 0.025 (0.31)

1-1/8 1.025 0.043 (0.53)

29

5.5.2 Glycol Solutions

NOTE

Glycol solutions should be considered for protection of the coil. When it is not used, damage can
occur from either freezing or corrosion from water.

When considering the use of any glycol products in a particular application, you should review the lat­est Material Safety Data Sheets and ensure that the use you intend can be accomplished safely. For
Material Safety Data Sheets and other product safety information, contact the supplier nearest you.
Before handling any other products mentioned in the text, you should obtain available product safety
information and take necessary steps to ensure safety of use.

NOTICE

When mishandled, glycol products pose a threat to the environment. Before using any glycol
products, review the latest Material Safety Data Sheets and ensure that you can use the
product safely.

Glycol manufacturers request that the customer read, understand and comply with the
information on the product packaging and in the current Material Safety Data Sheets. Make
this information available to anyone responsible for operation, maintenance and repair of the
drycooler and related equipment.

No chemical should be used as or in a food, drug, medical device, or cosmetic, or in a product or pro­cess in which it may contact a food, drug, medical device, or cosmetic until the user has determined
the suitability and legality of the use. Since government regulations and use conditions are subject to
change, it is the user's responsibility to determine that this information is appropriate and suitable
under current, applicable laws and regulations.

Glycol/GLYCOOL-Cooled Models

NOTICE

Automotive antifreeze is unacceptable and must NOT be used.

Typical inhibited formula ethylene glycol and propylene glycol manufacturers and suppliers are
Union Carbide (Ucartherm) or Dow Chemical (Dowtherm SR-1, Dowfrost). These glycols are supplied
with corrosion inhibitors and do not contain a silicone anti-leak formula. Commercial ethylene glycol,
when pure, is generally less corrosive to the common metals of construction than water itself. Aque­ous solutions of these glycols, however, assume the corrosivity of the water from which they are pre­pared and may become increasingly corrosive with use if not properly inhibited.

There are two basic types of additives: corrosion inhibitors and environmental stabilizers. The corro­sion inhibitors function by forming a surface barrier that protects the metals from attack. Environ­mental stabilizers, while not corrosion inhibitors in the strictest sense of the word, decrease corrosion
by stabilizing or favorably altering the overall environment. An alkaline buffer such as borax is a sim­ple example of an environmental stabilizer since its prime purpose is to maintain an alkaline condi­tion (pH above 7).

The percentage of glycol to water must be determined by using the lowest design outdoor temperature
in which the system is operating. Table 14 indicates the solution freeze point at several concentra­tion levels of ethylene glycol. Propylene glycol concentrations should be 1% higher than the ethylene
glycol table values to find the freeze point. For example, 41% propylene glycol freezes at -10°F (-23°C).

Table 14 Ethylene glycol concentrations

% Glycol by Volume 0 * 10 20 30 40 50
Freezing Point °F (°C) 32 (0) 25 (-3.9) 16 (-8.9) 5 (-15.0) -10 (-23.3) -32 (-35.5)
Apparent Specific Gravity

@ 50°F (10°C)

* A minimal amount of glycol should be considered for inhibitive coil protection.

1 1.014 1.028 1.042 1.057 1.071

NOTICE

The quality of water used for dilution must be considered because water may contain corrosive
elements that reduce the effectiveness of the inhibited formulation. Water classified as soft
(low in chloride and sulfate ion content less than 100 parts per million each) should be used.

30

5.5.3 Filling the System

Installation of hose bibs at the lowest point of the system is recommended. When filling a glycol sys­tem keep air to a minimum. Air in glycol turns to foam and is difficult and time-consuming to remove.
(Anti-foam additives are available and may be considered.) Open all operating systems to the loop.
With the top vent(s) open, fill the system from the bottom of the loop. This will allow the glycol to
push the air out of the top of the system, minimizing trapped air. Fill to approximately 80% of calcu­lated capacity. Fill slowly from this point, checking fluid levels until full.

NOTE

For glycol solution preparation and periodic testing, follow manufacturer's recommendations.
Do not mix products of different manufacturers.

Glycol/GLYCOOL-Cooled Models

31

Figure 14 Drycoolers and pump packages

Notes

1. Single pump packages are 17-1/4"
(438 mm) wide. Dual pump packages are
32-1/4" (819 mm) wide.

2. Mounting holes are 15-1/4" (387 mm)
apart on single pump packages and 30­1/4" (768 mm) apart on dual pump
packages.

3. Connection sizes apply to primary pump
supplier.

DRYCOOLER

Provided on

dual pump

package only

30-1/4"

(768mm)

A

B

19"

(483mm)

43-3/16"

(1097mm)

43-9/16"

(1105mm)

37-7/8"

(1095mm)

GLYCOL PUMP PACKAGE

See Note 1

A

B

C

3/4"

(19mm)

37-11/16"

(957mm)

1/2" (12.7mm) diameter
anchor bolts (typ)

B

C

PUMP PACKAGE

MOUNTING ANGLES

TYPICAL

FOOTPRINT

UNIT ANCHOR PLAN

See Table 16 for keys to
dimensions “A”, “B” and “C”.

See Table 15 for keys to
dimensions “A”, “B” and “C”.

1/2" diameter holes
for mounting (4 typ)

Note: Angles located

inside, bottom of pump
package. View used for
mounting reference.

1"

(25.4mm)

1"

(25.4mm)

1-3/4"

(25.4mm)

1-3/4"

(25.4mm)

4-1/4"

(25.4mm)

4-1/4"

(25.4mm)

For expansion tank dimensions,
see Figure 15 on page -33.

Glycol/GLYCOOL-Cooled Models

32

Figure 15 Pump packages—expansion tank

O

SL-10065 PG 7B SL-10070 PG 6B

30-1/2"

(774.7mm)

6-13/16"
(173mm)

17-1/4"

(438.2mm)

2-3/4"

(69.9mm)

4"

(101.6mm)

2-1/2"

(63.5mm)

7"

(177.8mm)

1/2" FPT
Fitting

1/2" FPT
Fitting

1" (25.4mm)

1" (25.4mm)

1-1/2"

(38.1mm)

1-1/2"

(38.1mm)

6-1/8"

(155.6mm)

9"

(228.6mm)

8.8 Gallon Expansion Tank
(33.3 Liter)

O 1/2 " (12.7mm) (8) Holes

3"

(76.2mm)

Table 15 Mounting hole dimensional data

A

PUMP PACKAGE

SINGLE (0.75 - 7.5 hp) 15-1/4 (387.4) 2-1/2 (63.5) 22-1/2 (571.5)

DUAL (0.75 - 5 hp) 30-1/4 (768.4) 2-1/2 (63.5) 22-1/2 (571.5)

DUAL (7.5 hp) 39-5/16 (998.5) 1-3/4 (44.5) 26-7/8 (682.6)

in (mm)

B

in (mm)

C

in (mm)

Glycol/GLYCOOL-Cooled Models

Table 16 Drycooler data

Model

-069 1 410 (186) 1-1/4 51-1/2 (1308) 44 (1118) 42 (1067) 2.4 (9.2)

-092 1 430 (195) 1-1/2 51-1/2 (1308) 44 (1118) 42 (1067) 3.7 (13.9)

-109 1 450 (204) 2 51-1/2 (1308) 44 (1118) 42 (1067) 4.9 (18.6)

-112 1 470 (213) 2 51-1/2 (1308) 44 (1118) 42 (1067) 5.8 (22.0)

-139 2 565 (256) 2 91-1/2 (2324) 84 (2134) 82 (2083) 4.8 (18.2)

-197 2 605 (274) 2 91-1/2 (2324) 84 (2134) 82 (2083) 9.0 (34.1)

Table 17 Glycol pump data*

1-1/2

1-1/2

* Connection sizes apply to primary pump supplier

No.

Pump

2
3
5

1

2
3

No. of

Fans

Connection in.

60
60
60
60

50
50
50
50

Weight

lb (kg)

Pump Suction

1-1/4
1-1/4
1-1/2
1-1/2

1-1/4
1-1/4
1-1/4
1-1/2

Drycooler

Conn. Sizes

(Suct. & Disc.) in.

Pump Discharge

Connection in. Hp Hz

3/4
3/4

1

1-1/4

3/4
3/4
3/4

1-1/4

“A” Dimension

in. (mm)

33

“B” Dimension

in. (mm)

“C” Dimension

in. (mm)

Volume, gal. (l)

Coil Internal

Figure 16 Glycol general arrangement

SL-11898 PG 6

Glyco l

Pump

Pump
Housing

Unions*

Isolation
Valves*

Expansion
Valve

Drycool er
Electric
Box

Dryc ooler
Coil

Fluid
Return
to Pump

Fluid
Supply
from
Pump

Unions*

Fill *

Expansion Tank Field Installed at
Highest Point in System.

Expansion
Port*

Air Vents*
at Top of
Risers

Hose
Bibs*

Flow Regulating
Valve*

Pressure
Port*

Sight
Glas s

Filter
Dri er

Evaporat or
Coil

Sensing
Bulb

External
Equalizers

Hot Gas
Bypass
Valve

Scroll
Compressor

Service
Valves

Hot Gas
Bypass
Solenoid
Valve

Hot Gas
Bypass

Tube
in Tube
Condenser

Tube
in Tube
Condenser

Bypass
Valve

2-Way Water
Regulating
Valve

Fluid
Return
from
Unit

Fluid
Supply
to Unit

Isolation
Valves*

Hose
Bibs*

Fluid
Supply
to Unit

Fluid
Return
From
Unit

3-Way Water
Regulating Valve
(optional)

FACTORY
PIPING

*Components are not supplied by Liebert but

are recommended for proper circuit operation

and maintenance.

FIELD
PIPING

Hose
Bibs*

Glycol/GLYCOOL-Cooled Models

34

Figure 17 GLYCOOL general arrangement

SL-11901 PG 5

Pump
Housing

Glyco l

Pump

Unions*

Isolation
Valves*

Expansion
Valve

Evaporator
Coil

Drycooler
Coil

Dryco oler
Electric
Box

Unions*

Pressure
Port*

Hose
Bib*

Fill

*

Fluid
Return to
Pump

Fluid
Supply
from
Pump

Air Vents*
at Top of
Risers

Flow Regulating
Valve*

Pressure
Port*

Sight
Glass

Sensing
Bulb

External
Equalizers

Hot Gas
Bypass
Valve

Scroll
Compressor

Service
Valves

Hot Gas
Bypass
Solenoid
Valve

Filter
Drier

Hot Gas
Bypass

Econ-O-Coil

3-Way Water
Regulating
Valve

3-Way Chilled
Glyco l Valve

Valve
Actuator

Econ-O-Cycle
Comparator

Econ-O-Coil
Circuit

Tube

in Tube

Condenser

Fluid
Supply to
Unit

Fluid
Return
from
Unit

Isolation
Valves*

Hose
Bibs*

FACTORY

PIPING

FIELD

PIPING

*Components are not supplied by Liebert but

are recommended for proper circuit operation

and maintenance.

Expansion Tank Field Installed at
Highest Point in System

Glycol/GLYCOOL-Cooled Models

35

5.6 Condenser

The condenser is designed to operate in conjunction with a drycooler. The maximum coolant pressure
is 350 psig (2413 kPa).

NOTE

For pressures above 150 psig (1034 kPa), the high pressure option for high pressure valve(s)
is required.

5.7 Glycol Regulating Valve

The glycol regulating valve automatically regulates the amount of coolant necessary to remove the
heat from the refrigeration system, permitting more fluid to flow when load conditions are high and
less fluid to flow when load conditions are low. The valve consists of a brass body, balance spring,
valve seat, valve disc holders, capillary tube to discharge pressure, and adjusting screw.

5.7.1 Glycol Regulating Valve Adjustment

The Liebert Challenger ITR may be equipped with either a standard Johnson Controls valve, 150 psig
(1034 kPa) or with a high-pressure Johnson Controls valve, 350 psig (2413 kPa). For details on adjust­ing the valve, refer to 4.3.1 - Water Regulating Valve Adjustment.

5.7.2 Testing Valve Function

When the refrigeration system has been off for approximately 10-15 minutes, the coolant flow should
stop.

Glycol/GLYCOOL-Cooled Models

Should the coolant continue to flow, the valve is either improperly adjusted or the pressure sensing
capillary is not connected properly to the condenser.

Table 18 Refrigerant control settings psi (kPa)

Low Pressure

Cut Out

20 (137.9) 65 (448.2) 360 (2482)

Low Pressure

Cut In

High Pressure

Cut Out

36

6.0 CHILLED WATER MODELS

A

B

AB

FIELD PIPING

SL-11899
Pg. 5

Air
Flow

Chilled
Water
Coil

Bleed
Valve

Valve
Actuator

Val ve

Flow
Switch
(optional)

Chilled
Water
Supply

Chilled
Water
Return

Hose
Bibs*

Hose
Bibs*

Shutoff
Valves*

3-WAY VALVE

Air
Flow

Bleed
Val ve

Chilled
Water
Coil

Valve
Actuator

Shutoff
Val ves*

Chilled
Water
Return

Chilled
Water
Supply

2-WAY VALVE

2-Way
Chilled
Water
Valve

SINGLE CIRCUIT SHOWN

*Components are not supplied by Emerson but
are recommended for proper circuit operation
and maintenance.

FACTO RY PIPI NG

3-Way

Chilled

Water

6.1 Piping Considerations

Manual shut-off valves should be installed at the supply and return lines to each unit. This will pro­vide for routine service and emergency isolation of the unit.

Consideration of the minimum water temperature to be supplied from the chiller will determine if the
need exists to insulate supply and return lines. Insulation will prevent condensation on the supply
and return lines.

To provide for the emergency of water leaks and the consequences of sub-floor flooding, floor drains
should be provided with wet traps or a water detection system, such as a Liqui-tect, that is installed
near the base of the unit or below the elevated floor.

Figure 18 Chilled water general arrangement - horizontal flow (BR)

Chilled Water Models

37

7.0 SPLIT SYSTEM MODELS

!

Three (3) condensing unit styles are available: two (2) air-cooled and one (1) water/glycol-cooled con­densing unit.

7.1 Location Considerations

7.1.1 Air-Cooled Condensing Units

To assure an adequate air supply, it is recommended that all condensing units be located in a clean
air area, away from loose dirt and foreign matter that may clog the coil.

Condensing units must not be located in the vicinity of steam, hot air, or fume exhausts or closer than
18" from a wall, obstruction, or adjacent unit.

The outdoor condensing unit should be located for maximum security and maintenance accessibility.
Avoid ground-level sites with public access or areas that will contribute to heavy snow accumulations.
Do not allow the discharge air to blow into another condensing unit.

A solid base, capable of supporting the weight of the condenser and at least 2" (51 mm) higher than
the surrounding grade and at least 2" (51 mm) larger than the condensing unit base dimensions,
should be installed at the pre-determined location. In snow areas, a base of sufficient height to clear
snow accumulation must be installed.

The centrifugal fan air-cooled condensing unit may be located above the dropped ceiling or any remote
indoor area. If noise is of concern, the condensing unit should be located away from personnel. Normal
operating sound may be objectionable if the condensing unit is placed near quiet work areas.

Split System Models

To mount the unit in the ceiling, refer to 7.5.1 - Installing the Indoor Condensing Unit for hang­ing guidelines and to Figure 23 - Detail of ceiling hanging bracket for dimensional data.

7.1.2 Water/Glycol-Cooled Condensing Units

The condensing unit may be located above the dropped ceiling or any remote indoor area. If noise is of
concern, the condensing unit should be located away from personnel. Normal operating sound may be
objectionable if the condensing unit is placed near quiet work areas. To mount the unit the in ceiling,
refer to 7.5.1 - Installing the Indoor Condensing Unit.

7.2 Electrical Connections

Refer to equipment nameplate regarding wire size and circuit protection requirements. Refer to elec­trical schematic when making connections. Make all wiring and electrical connections in accordance
with local and national codes.

WARNING

Risk of electric shock. Can cause injury or death.
Disconnect all local and remote electric power before working within the unit. Use a

voltmeter to make sure power is turned off before making any electrical connections.

7.2.1 Line Voltage

Line voltage electrical service is required for all condensing units at the location of the condensing
unit. This power supply does not have to be the same voltage as the indoor unit. This separate power
source may be 208, 230, 460 or 575V, 60 Hz; or 200, 230, or 380/415 V, 50 Hz. A disconnect switch is
required and must be mounted per local and national codes to isolate the unit for maintenance.

7.2.2 Low Voltage

The control cable between the condensing unit and the evaporator unit is connected between termi­nals 1,2 and 3 on the terminal strip in the evaporator unit and the condensing unit control box. A
fourth wire is required on systems with hot gas bypass. NEC Class 1 wiring is required. Glycol-cooled
units also require a two-wire control connection to the drycooler and pump package.

38

7.3 Piping Considerations

!

7.3.1 Refrigerant Loop

CAUTION

All local codes for handling refrigerant must be followed.

NOTE

As R22 and R407C are similar in properties, proper safety equipment and proper refrigeration
tools are required on both types. Check unit nameplate for correct refrigerant type before
topping off or recharging a system.

NOTE

Refrigerant R407C uses a POE (polyol ester) lubricant. The R407C refrigerant must be
introduced and charged from the cylinder only as a liquid.

NOTE

When installing field piping, care must be taken to protect all refrigerant lines from the
atmosphere, especially when using refrigerants with POE oils. Do not allow the piping to stand
open to air for more than 15 minutes. Units designed for R407C have a compressor which
contains POE oil that is very hygroscopic; that is, it quickly absorbs water from the air. The
longer the compressor piping is left open to air, the harder it will be to fully evacuate. If left
open too long, the POE oil may need to be replaced before achieving the required vacuum level.

Split System Models

NOTE

Complete all piping and evacuate lines before connecting quick connects when using an
optional sweat adapter kit and field installed hard piping.

Follow all proper brazing practices including a dry nitrogen purge to maintain system
cleanliness.

All split systems require two refrigerant lines (an insulated copper suction line and a copper liquid
line) between the evaporator and the condensing unit.

Two possible methods exist for installing the copper suction and liquid lines.

1. Using an optional Sweat Adapter Kit and hard piping between the two units.

2. Using optional pre-charged line sets.

All refrigeration piping should be installed with high temperature brazed joints. Prevailing good
refrigeration practices should be employed for piping supports, leak testing, evacuation, dehydration,
and charging of the refrigeration circuits. The refrigeration piping should be isolated from the build­ing by the use of vibration isolating supports.

It is important to handle the pre-charged lines with care so they will not get kinked or damaged. Use
tube benders and make all bends before making connections to either end. Coil any excess tubing in a
horizontal plane with the slope of the tubing toward the condensing unit.

To prevent tube damage when sealing openings in walls and to reduce vibration transmission, use a
soft flexible material to pack around the tubes.

When installing remote condensing units mounted above the evaporator, the suction gas line should
be trapped at the evaporator. This trap will retain refrigerant oil in the off cycle. When the unit
starts, oil in the trap is carried up the vertical riser and returns to the compressor.

Refrigerant charge requirements: Total refrigerant charge will be required only if units are evacuated
during installation or maintenance. Total refrigerant charge = evaporator + lines + condensing unit.

NOTE

All condensing units and 3-ton evaporator units are fully charged with refrigerant. All
23 and 33 kW evaporator units include a nitrogen holding charge only. See Table 19 for field
charge required. If field-supplied refrigerant piping is installed, refrigerant must be added to
the system.

39

Split System Models

Once all piping is complete, check for leaks and dehydrate the field piping as follows:

1. Pressurize the field piping to 150 PSIG (1034 kPa) using dry nitrogen with a trace of refrigerant.
Check system for leaks with a suitable leak detector.

2. After completion of leak testing, release the test pressure (per local code) and pull a deep vacuum
on the field piping with a suitable pump.

3. After 15 minutes, check the pressure readings and, if they have not changed, break vacuum with
dry nitrogen. Pull a second vacuum to 250 microns or less. Recheck the pressure after 15 minutes.

Table 19 Unit refrigerant charge

R22 Charge R407C Charge

Model

060E 0.81 (0.37) 0.8 (0.4) PF_Z67A-_L 51.69 (23.45) 50.1 (22.7)

059E 0.81 (0.37) 0.8 (0.4) PF_Z66A-_L 51.69 (23.45) 50.1 (22.7)

MC_65/64A 27.00 (12.25) 26.1 (11.8) PF_067A-_H 51.69 (23.45) 50.1 (22.7)

PF_067A-_L 26.63 (12.08) 25.8 (11.7) PF_066A-_H 51.69 (23.45) 50.1 (22.7)

PF_066A-_L 26.63 (12.08) 25.8 (11.7) MC_69/68W 5.88 (2.67) n/a

lb (kg) lb (kg) lb (kg) lb (kg)

Model

R22 Charge R407C Charge

Table 20 Line charges - refrigerant per 100 ft (30 m) of Type “L” copper tube

R22 R407C

O.D.

1/2" 7.3 (3.3) 0.2 (0.1) 6.9 (2.9) -

5/8" 11.7 (5.3) 0.3 (0.2) 11.0 (4.6) 0.4 (0.2)

7/8" 24.4 (11.1) 0.7 (0.3) 23.0 (9.6) 1.0 (0.4)

1-1/8" 41.6 (18.9) 1.2 (0.6) 39.3 (16.3) 1.7 (0.7)

1-3/8" 63.3 (28.7) 1.9 (0.8) 59.8 (24.8) 2.7 (1.1)

Liquid Line

lb (kg)

Suction Line

lb (kg)

Liquid Line

lb (kg)

Suction Line

lb (kg)

Table 21 Recommended refrigerant lines (R22 or R407C) sizes OD copper

3.5 Tons

036E (035E)

Equivalent Feet (m)

0-50 (0-15) 7/8" 1/2" 1-1/8" 1/2"

51-100 (16-30) 1-1/8" 1/2" 1-1/8" 5/8"

101-150 (31-45) 1-1/8" 5/8" 1-3/8" 5/8"

Suction Liquid Suction Liquid

23 & 33 kW

060E (059E)

Table 22 Line coupling sizes

Line Size

OD Cu, in.

1/2 & 5/8 #10 35-45

1-1/8 #12 50-65

Coupling

Size

Torque

lb-ft.

40

Table 23 Equivalent lengths (feet) for various pipe fittings

Evaporator

Condensing

Unit

Evaporator Condensing

Unit

Suction Line Piping
Condensing unit above evaporator .
Traps recommended at t he bas e of riser and
every 25 feet (7.6m) of vertic al rise.

Suction Line Piping
Condensing unit
below evaporator

NOTE
When remote condensing units are installed below the
evaporator, the suction gas line should be trapped with
an inverted trap to the height of the evaporator. This
preven ts refrigeran t mig ra tion to th e compre ssors
during off cycles. Maximum recommended vertical drop
to con densin g uni t is 15 ft. ( 4.6m).

Pitch down 1/2" (13mm) per 10 ft. (3m)

Copper Pipe

OD in.

1/2 0.8 1.3 0.4 2.5 0.26 7.0 4.0

5/8 0.9 1.4 0.5 2.5 0.28 9.5 5.0

3/4 1.0 1.5 0.6 2.5 0.3 12.0 6.5

7/8 1.45 1.8 0.8 3.6 0.36 17.2 9.5

1-1/8 1.85 2.2 1.0 4.6 0.48 22.5 12.0

1-3/8 2.4 2.9 1.3 6.4 0.65 32.0 16.0

1-5/8 2.9 3.5 1.6 7.2 0.72 36.0 19.5

Refrigerant trap = 4 times equivalent length of pipe per this table

90 Degree

Elbow Copper

Figure 19 Refrigerant piping diagram

90 Degree

Elbow Cast

45 Degree

Elbow Tee

Gate

Valve

Globe

Valve

Split System Models

Angle

Valve

41

7.3.2 Quick Connect Fittings

NOTE

When hard piping is used, complete all piping and evacuate lines before
connecting quick connects.

Be especially careful when connecting the quick connect fittings. Read through the following steps
before making the connections.

1. Remove protector caps and plugs.

2. Carefully wipe coupling seats and threaded surfaces with a clean cloth.

3. Lubricate the male diaphragm and synthetic rubber seal with refrigerant oil.

4. Thread the coupling halves together by hand to ensure that the threads mate properly.

5. Tighten the coupling body hex nut and union nut with the proper sized wrench until the coupling
bodies “bottom out” or until a definite resistance is felt.

6. Using a marker or pen, make a line lengthwise from the coupling union nut to the bulkhead.

7. Tighten the nuts an additional quarter turn; the misalignment of the lines shows how much the
coupling has been tightened. This final quarter turn is necessary to ensure that the joint will not
leak. Refer to Table 22 for torque requirements.

8. Add charge for the additional piping (refer to Table 20).

Split System Models

42

7.4 Outdoor Air-Cooled Condensing Units

A

B

C

INDICATES A MINIMUM

CLEARANCE OF 18" (45 7mm)

FOR PR OPER

AIR FLOW .

SHADED ARE A

INDICATES A MINIMUM

CLEARANCE OF 18" (4 57mm)

FOR PR OPER AIR F LOW

SHADED ARE A

INDICATES A RECOMMENDED

CLEARANC E OF 2 4" (610m m)

FOR COMPONENT ACCESS

AND REMOVAL.

LEFT

AIR

INTAKE

REMOVABLE (FRONT) PANEL FOR

ACCESS TO HIGH VOLTAGE &

LOW VOLTAGE CONNECTIONS,

AND RE FRIGERAT ION CO MPON ENTS.

RIGHT

AIR

DISCHARGE

REMOV ABLE (R IGHT) PAN EL

FOR ACCESS T O

REFRIGERATION COMPONENT.

Fan Rotation

CCW

(left side)

SL-11081 PG 4

C

C

SHADED AREA

Liquid Line

Suction Line

Quick Connect
(Male Coupling .

Electrical Entrance for

Electrical Entrance for
Low Voltage Connection

SL-11081PG 6

Quick Connect
(MaleCoupling).

Except as noted

B

C

A

F

G

D

E

High Voltage
Connection

UNIT DIMENSIONS
(See Table 24)

Figure 20 Outdoor air-cooled condensing unit—horizontal air discharge models

Split System Models

43

Table 24 Horizontal air discharge cabinet and floor planning dimensional data

Model Numbers Dimensional Data in. (mm) Module

Weight

lb (kg) net60 Hz 50 Hz A B C

PFC067A-_L PFC066A-_L

PFH067A-_L

53 (1343) 36-1/4 (918) 18 (457) 351 (159)

Table 25 Horizontal air discharge piping and electrical connection data

Model Numbers Dimensional Data in. (mm) Piping Connections in. (mm)

60 Hz 50 Hz A B C D E F G

PFC067A-_L PFC066A-_L

PFH067A-_L

2 (51) 6 (152) 8-1/2 (216) 4-3/4 (121) 7-3/4 (197) - 8-1/2 (216)

Split System Models

44

Figure 21 Outdoor air-cooled condensing unit—top air discharge models

SL-11081PG 5

C

A

2"

B

LEFT

AIR

INTAKE

(51mm)

D

GUARD
HEIGHT

TOP

AIR

DISCHARGE

RIGHT

AIR

INTAKE

SHADED AREA

INDICATES A RECOMMENDED

CLEARANCE OF 18" (457mm)

FOR PROPER AIR FLOW

SHADED AREA

INDICATES A RECOMMENDED

CLEARANCE OF 24" (610mm)

FOR COMPONENT ACCESS

AND REMOVAL.

SHADED AREA

INDICATES A RECOMMENDED

CLEARANCE OF 18" (457mm)

FOR PROPER AIR FLOW

REMOVABLE FRONT PANEL FOR

ACCESS TO HIGH VOLTAGE &

LOW VOTLAGE CONNECTIONS,

AND REFRIGERATION COMPONENTS.

36 1/8 "

423/32 "

25 3/32 "

46 7/32 "

53 3/16 "

4" TYP.

32 1/8 "

2" TYP.

2"

2"

(918mm)

(102mm)

(51mm)

(1351mm )

(120mm)

(637mm)

(1174mm)

(51mm)

(51mm)

(816mm)

FOOTPRINT

DIMENSIONS

1/2" Bolt-Down Holes

(6 places)

SL-11081 PG 7

* System 2 (23 & 33kW)

Electrical Entrance for
High Voltage Connection

Electrical Entrance
for Low Voltage
Connection

Liquid Line
Quick Connect
(Male Coupling)

Suction Line
Quick Connect
(Male Coupling)

* System 1 (3 Ton)

* System 1 and System 2 on 8Ton only.

G

F

B

C

A

D

E

UNIT DIMENSIONS
(see Table 26)

PIPING & ELECTRICAL
CONNECTIONS
(see Table 27)

Split System Models

45

Split System Models

Table 26 Cabinet and floor planning dimensional data - prop fan condensing modules, top air discharge

Model Numbers Dimensional Data, in. (mm) Module

Weight

lb (kg) net60 Hz 50 Hz A B C D

PFC067A-_H PFC066A-_H

53 (1343) 36-1/4 (918) 38-1/2 (978) 5-1/2 (140) 488 (222)PFH067A-_H

PFCZ67A-_L PFCZ66A-_L

Table 27 Piping and electrical connections - top air discharge

Model Numbers Dimensional Data in. (mm) Piping Connections, in. (mm)

60 Hz 50 Hz A B C D E F

PFC067A-_H PFC066A-_H

2 (51) 6 (152) 8-1/2 (216) 4-3/4 (121) 7-3/4 (197) 8-1/2 (216)PFH067A-_H

PFCZ67A-_L PFCZ66A-_L

46

Figure 22 Electrical field connections, prop fan condensing module

NOTE: Refer to specification sheet for full load amp
and wire size amp ratings.

SL-11081 PG 8

Factory-wired
to components on
electric panel.

Heat rejection connection. Field­supplied 24V NEC class 2 wiring.
Wire connections from evaporator module:

1. 24V GND

2. 24V Supply
3 High Pressure Alarm

4. Hot Gas Bypass Connection
(only on units with hot gas bypass.
If no hot gas bypass, connection is
provided in the evaporator module.
Connect wire 4 with wire 2 to the
24V supply).

Electric service
connection to contactor
or terminal block

Single- or 3-phase
electric service; not
by Liebert

High voltage electric
power supply entrance

Low voltage electric
power supply entrance

Earth ground connection
terminal for field wiring.

SL-11081PG 8A

TOP AIR

DISCHARGE MODELS

(23 & 33kW High Ambient

and 23 & 33kW Quiet-Line)

HORIZONTAL AIR DISCHARGE MODELS

Single- or
3-phase
electric
service; not
by Liebert

Field-supplied 24V NEC

Class 2 wiring to

evaporator module

Single- or
3-phase
electric
service;
not by Liebert

Field-supplied unit
disconnect switch

Field-supplied 24V
NEC Class 2 wiring
to evaporator
module

Split System Models

47

7.5 Centrifugal Air-Cooled Condensing Units

!

7.5.1 Installing the Indoor Condensing Unit

Refer to drawings for unit dimensions and component locations.

WARNING

Risk of structure collapse. Can cause equipment damage, injury or death.

Before beginning installation, make sure that the supporting roof structure is capable of
supporting the weight of the unit(s) and the accessories during installation and service. (See
Table 28 - Indoor centrifugal condensing unit.)

Be sure to securely anchor the top ends of the suspension rods. Make sure all nuts are tight.

The indoor condensing unit is usually mounted above the ceiling and must be securely mounted to the
roof structure. The ceiling and ceiling supports of existing buildings may require reinforcements. Be
sure to follow all applicable codes. Use field-supplied threaded suspension rods and
3/8"-16 factory hardware kit.

Recommended clearance between ceiling grids and building structural members is unit height plus
three inches.

Install the four field-supplied rods by suspending them from suitable building structural members.
Locate the rods so that they will align with the four mounting holes in the flanges that are part of the
unit base.

Split System Models

Using a suitable lifting device, raise the unit up and pass the threaded rods through the four mount­ing holes in the flanges that are part of the unit base.

Attach the threaded rods to the unit flanges using the supplied nuts and grommets. (See Figure 23 -
Detail of ceiling hanging bracket, Threaded Rod and Hardware Kit Installation). The rubber
grommets provide vibration isolation.

1. Use the plain nuts to hold unit in place. Adjust these nuts so that the weight of the unit is
supported evenly by the four rods, does not rest on the ceiling grid, and is level.

NOTE

The units must be level in order to operate properly.

2. Use the Nylock nuts to “jam” the plain nuts.

Table 28 Indoor centrifugal condensing unit

Model

MC_65A MC_64A 449 (204)

MC_69W MC_68W 282 (128)

Net Weight

lb (kg)60 Hz 50 Hz

48

Figure 23 Detail of ceiling hanging bracket

3/8" threaded rod
(field-supplied)

3/8" hex nut

3/8" washer

Sleeve

Isolator

3/8" fender washer

3/8" hex nut

3/8" hex nut
Nylock

Unit base pan (ref)

7.5.2 Ducting

The total external static pressure for the inlet and outlet ducts, including grille, must not exceed

0.5 inches of H

sions.

O. Hood intake dimensions should be the same as the condensing unit duct dimen-

2

Split System Models

If the condensing unit is located close to the outside of the building, rain hoods must be installed. In
addition, install a triple layer bird screen over rain hood openings to eliminate the possibility of
insects, birds, water, or debris entering the unit.

Use flexible ductwork or nonflammable cloth collars to attach ductwork to the unit and to control
vibration transmission to the building. Attach the ductwork to the unit using the flanges provided.
Locate the unit and ductwork so that the return air does not short circuit to the supply air inlet.

Avoid directing the hot exhaust air toward adjacent doors or windows.

Normal operating sound may be objectionable if the condensing unit is placed directly over quiet work
areas. Ductwork that runs through a conditioned space or is exposed to areas where condensation
may occur must be insulated. Whenever possible, ductwork should be suspended using flexible hang­ers. Ductwork should not be fastened directly to the building structure. In applications where the ceil­ing plenum is used as the heat rejection domain, the discharge air must be directed away from the
condensing unit air inlet and a screen must be added to the end of the discharge duct to protect ser­vice personnel.

For multiple unit installations, space the units so that the hot condensing unit exhaust air is not
directed toward the air inlet of an adjacent unit.

Table 29 Airflow CFM (CMH)

60 Hz 3500 (5947)

50 Hz 3500 (5947)

23 & 33 kW

49

Figure 24 Centrifugal air-cooled condensing unit dimensional data

SL-11087 PG 4

51 13/16 "

1 3/4 "

21 1/4 "

1 5/8 "

48 "

33 5/8 "

54 "

32 "

8 15/16 "

15 3/4 "

3 3/8 "

14 1/2 "

24 "

(812.8mm)

(1371.6mm)

(41.1mm)

(1219.2mm)

(400mm)

(227mm)

CABINET

DIMENSION

CABINET

DIMENSION

(539.8mm)

(44.5mm)

(854.1mm)

(1316mm)

(610mm)

(368.3mm)

(85.7mm)

CABINET

DIMENSION

THREADED ROD

CENTERS

THREADED ROD

CENTERS

Shaded area indicates a
re

commended clearance of
30" (762mm) for component
access and

removal.

Hanger Bracket

Customer-supplied
threaded rods for module
support from ceiling
(typ. 4)

1/2" (12.7mm) dia. holes for
threaded rods (typ. 2 each end)

Air
Outlet

Air Inlet

7/8" (22.2mm) & 1 1/8" (28.6mm)
dia. knockouts electrical entrance for high
voltage connection (Single Point Power Kit).

7/8" (22.2mm) & 1 1/8" (28.6mm)
dia. knockouts electrical entrance for high
voltage connection.

Suction Line male quick
conect location.

Liquid Line male quick
connect location

Single Point Power Kit
connection to Evaporator.

7/8" (22.2mm) dia. electrical entrance
for low voltage connection.

7/8" (22.2mm) dia. knockout
electrical entrance for altermate
control panel low voltage routing.

NO

TE: Unit is spaced evenly in
reference to threaded
rod centers.

Split System Models

50

Figure 25 Centrifugal air-cooled condensing unit dimensional data (con't.)

DPN000226
Rev. 0

Field-supplied unit disconnect
switch when factory unit
disconnect switch is not supplied.

Electric service
not by Emerson

Optional factory-installed
disconnect switch

Line voltage electric power
supply conduit voltage

Connection terminal
for field supplied earth
grounding wire

Removable access panels

AIR COOLED

Field-supplied 24V NEC
Class 2 wiring
between condensing
unit and fan/coil unit

Low voltage electric power
supply conduit entrance

Heat rejection connection. Field-supplied
24V NEC Class 2 wiring. See Note 2.
Wire connections from evaporator module.

1. 24V GND

2. 24V supply

3. High pressure alarm (optional)

4. Hot gas bypass connection (only on
units with hot gas bypass)

NOTES:

1. Refer to specification sheet for full load amp and wire size amp ratings.

2. Control voltage wiring must be a minimum of 16 GA (1.6mm) for up to 75’ (23m)
or not to exceed 1 volt drop in control line.

Split System Models

51

Figure 26 Split systems general arrangement

SL-11900 PG 5

Condenser
Coil

1/2" (12.7mm) NPT
Pressure Relief Valve

Sight
Glass

Check

Valve

Lee-Temp
Receiver

High Pressure

Switch
Scroll
Compressor

Head Pressure
Control with
Integral Check
Valve

Liquid Line
Solenoid Valve

Suction Line
Male Quick
Connect
Coupling*

Liquid Line
Male Quick
Connect
Coupling*

Suction Line
Female Quick
Connect
Coupling*

Liquid Line
Female Quick
Connect
Coupling*

Filter
Drier

Service
Access
Ports

Sensing
Bulb

Expansion
Valve

External
Equalizer

Evaporator
Coil

High Pressure
Switch

Scroll
Compressor

Suction Line
Male Quick
Connect
Coupl

ing*

Liquid Line
Male Quick
Connect
Coupling*

Suction Line
Female Quick
Connect
Coupling*

Liquid Line
Female Quick
Connect
Coupling*

Filter
Drier

Service
Access
Ports

Sensing
Bulb

External
Equalizer

Evaporator
Coil

Expa

nsion

Valve

Tube in
Tube
Condenser

Water/Glycol
Supply
Line

Water/Glycol
Retur

n

Line

2-Way Water
Regulating
Valve

Fluid Supply
to Unit

Fluid Return
from Unit

Shutoff
Valves*

Hose Bibs*

Tube in

Tube

Condenser

Fluid
Return
from Unit

Fluid Supply
to Unit

3-Way Water
Regulating Valve

(optional)

AIR COOLED

WATER COOLED
GLYCOL COOLED

OPTIONAL PIPING

FACTORY
PIPING

SINGLE CIRCUIT SHOWN

*Components are not supplied by Liebert but
are recommended for proper circuit operation
and maintenance.

Pressure Balancing
Valve

Liquid Injection
Valve Bulb

Liquid Injection
Valve

Hot Gas
Bypass Control
Valve

Hot Gas
Bypass Solenoid
Valve

Receiver Heater
Pressure Limiting
Switch

Liquid Injection
Valve

Liquid Injection
Valve Bulb

Hot Gas Bypass
Control Valve

Hot Gas Bypass
Solenoid Valve

NOTE: Refer to installation manual for
field piping guidelines.

1

1

1

Split System Models

52

7.6 Water and Glycol-Cooled Condensing Units

For installation guidelines, refer to Installing the Indoor Condensing Unit on page 48.

7.6.1 Piping Considerations

It is recommended that manual service shut-off valves be installed at the supply and return line to
each unit. This will provide for routine service or emergency isolation of the unit.

When the water source for the condenser is of poor quality, it is good practice to provide cleanable fil­ters in the supply line. These filters will trap the particles in the water supply and extend the service
life of the water-cooled condenser.

Table 30 Water and glycol-cooled unit connection sizes

Connection Size and Type

Condenser Water Inlet 1-1/8" OD Cu

Condenser Water Outlet 1-1/8" OD Cu

Suction Line 1-7/16" - 16 male #12 quick connect

Liquid Line 1-1/16" - 12 male #10 quick connect

Table 31 Water and glycol-cooled condensing unit data

Net Weight Glycol Volume

Model

MC_69W
MC_68W

lb kg gal liters

282 128 2.0 7.6

Split System Models

7.6.2 Condenser Water Requirements

The standard maximum water pressure is 150 psig (1034 kPa). For applications above this pressure,
consult the factory about high pressure systems.

The system will operate in conjunction with a cooling tower, city water, or drycooler.

7.6.3 Regulating Valve Adjustment and Testing

Refer to 4.3.1 - Water Regulating Valve Adjustment and 4.3.3 - Testing Valve Function.

7.6.4 Glycol Systems

For split system glycol systems, use drycooler and pump data found in 5.0 - Glycol/GLYCOOL­Cooled Models. See Table 16 - Drycooler data.

Electrical control interconnect to drycooler is wired from water/glycol condensing unit.

53

Figure 27 Water/glycol-cooled condensing unit dimensions

SL-11087PG 6

32 "

32 "

29 13/16 "

33 5/8 "

24 "

(812.8mm)

(610mm)

(854.1mm)

(757.2mm)

CABINET

DIMENSION

THREADED ROD

CENTERS

(812.8mm)

CABINET

DIMENSION

CABINET

DIMENSION

THREADED ROD

CENTERS

Hanger Bracket

Shaded area indicates a
recommended cl earance of
30" (762mm)

for component access

and removal.

Removable Access Panel

1/2" (12. 7mm) dia. holes for
module rigging (typ. 2 each end).

Customer supplied threaded rods
for module support from ceiling
(typ. 4).

NOTE:Unitisevenlyspacedin reference

to threaded rod centers.

1" (25.4mm) NPT Female Water/Glycol
Outlet Connection

1" (25.4mm) NPT Female Water/Glycol
Inlet Connection

7/8" (22.2mm) dia. knockout electrical entrance
for alternate control panel low voltage routing.

7/8" (22.2mm) dia. electrical entrance
for low voltage connection.

Suction Line male quick
connect loca tion

Liquid Line male quick
connect location

7/8" (22.2mm) & 1 1/8" (28.6mm)
dia. knockouts electrical entrance for
line voltage connection

7/8" (22.2mm) & 1 1/8" (28.6mm)
dia. knockouts electrical entrance for
line voltage connection (Single Point
Power Kit)

7"

33/4 "

87/16 "

(214.4mm)

(95.2mm)

(177.8mm)

Split System Models

54

Figure 28 Water/glycol-cooled condensing unit (con't.)

DPN000228_Rev0

Heat rejection connection.
Field-supplied 24V NEC
Class 2 wiring. Wire
connections from evaporator
mod:

1. 24V ground

2. 24V supply

3. High pressure alarm (optional)

4. Hot gas bypass
connection (only on units with
hot gas bypass)

Remote drycooler
connection; field-supplied
24V NEC Class 1 wiring
(glycol-cooled units only)

WATER/GLYCOL

Optional factory-installed
disconnect switch

Field-supplied 24V NEC Class1
wiring to fan/coil unit

Field-supplied unit disconnect
switch when factory unit
disconnect switch is not supplied

Field-supplied 24V NEC Class1
wiring to drycooler
(glycol-cooled units only)

Removable
Access
Panel

Connection terminal
for field-supplied
earth grounding wire

Line-voltage electric power
supply conduit entrance

Field-supplied 24V NEC
Class 1 wiring between
glycol condensing unit
and drycooler

Low-voltage electric
power supply conduit entrance

Electric service;
not by Liebert

NOTES

1. Refer to specification sheet for full load amp. and wire size amp. ratings.

2. Control voltage wiring must be a minimum of 16 GA (1.6mm) for up to 75' (23m)
or not to exceed 1 volt drop in control line.

Split System Models

55

R407C Refrigerant

8.0 R407C REFRIGERANT

Table 32 R407C pressure/temperature chart for operation and superheat (discharge/hot gas and suction

gas)

Temperature Gauge Pressure Temperature Gauge Pressure Temperature Gauge Pressure

°F °C Psig kPa °F °C Psig kPa °F °C Psig kPa

0.0 -17.8 18.9 130 35.0 1.7 54.8 378 70.0 21.1 114.9 792

1.0 -17.2 19.6 135 36.0 2.2 56.1 387 72.0 22.2 119.3 822

2.0 -16.7 20.4 141 37.0 2.8 57.5 396 74.0 23.3 124 853

3.0 -16.1 21.2 146 38.0 3.3 58.9 406 76.0 24.4 128 885

4.0 -15.6 22.0 152 39.0 3.9 60.3 415 78.0 25.6 133 917

5.0 -15.0 22.8 157 40.0 4.4 62.2 429 80.0 26.7 138 950

6.0 -14.4 23.6 163 41.0 5.0 63.1 435 82.0 27.8 143 984

7.0 -13.9 24.5 169 42.0 5.6 64.6 445 84.0 28.9 148 1019

8.0 -13.3 25.4 175 43.0 6.1 66.1 456 86.0 30.0 153 1054

9.0 -12.8 26.2 181 44.0 6.7 67.6 466 88.0 31.1 158 1091

10.0 -12.2 27.1 187 45.0 7.2 69.1 476 90.0 32.2 164 1128

11.0 -11.7 28.0 193 46.0 7.8 70.7 487 92.0 33.3 169 1167

12.0 -11.1 28.9 200 47.0 8.3 72.2 498 94.0 34.4 175 1206

13.0 -10.6 29.9 206 48.0 8.9 73.8 509 96.0 35.6 181 1246

14.0 -10.0 30.8 213 49.0 9.4 75.4 520 98.0 36.7 187 1287

15.0 -9.4 31.8 219 50.0 10.0 77.1 531 100.0 37.8 193 1329

16.0 -8.9 32.8 226 51.0 10.6 78.7 543 102.0 38.9 199 1372

17.0 -8.3 33.8 233 52.0 11.1 80.4 554 104.0 40.0 205 1416

18.0 -7.8 34.8 240 53.0 11.7 82.1 566 106.0 41.1 212 1461

19.0 -7.2 35.8 247 54.0 12.2 83.9 578 108.0 42.2 219 1507

20.0 -6.7 36.9 254 55.0 12.8 85.6 590 110.0 43.3 225 1553

21.0 -6.1 38.0 262 56.0 13.3 87.4 603 112.0 44.4 232 1601

22.0 -5.6 39.0 269 57.0 13.9 89.2 615 114.0 45.6 239 1650

23.0 -5.0 40.1 277 58.0 14.4 91.0 628 116.0 46.7 247 1701

24.0 -4.4 41.3 284 59.0 15.0 92.9 640 118.0 47.8 254 1752

25.0 -3.9 42.4 292 60.0 15.6 94.8 653 120.0 48.9 262 1804

26.0 -3.3 43.6 300 61.0 16.1 96.7 666 122.0 50.0 269 1858

27.0 -2.8 44.7 308 62.0 16.7 98.6 680 124.0 51.1 277 1912

28.0 -2.2 45.9 317 63.0 17.2 100.5 693 126.0 52.2 285 1968

29.0 -1.7 47.1 325 64.0 17.8 102.5 707 128.0 53.3 294 2025

30.0 -1.1 48.4 333 65.0 18.3 104.5 721 130.0 54.4 302 2083

31.0 -0.6 49.6 342 66.0 18.9 106.5 735 132.0 55.6 311 2143

32.0 0.0 50.9 351 67.0 19.4 108.6 749 134.0 56.7 320 2203

33.0 0.6 52.1 359 68.0 20.0 110.7 763 136.0 57.8 329 2265

34.0 1.1 53.5 369 69.0 20.6 112.8 778 138.0 58.9 338 2329

- - - - - - - - 140.0 60.0 347 2393

NOTE

Use this table for superheat and for control adjustment (e.g., pressure switches). See
Table 33 for subcooling.

56

R407C Refrigerant

Table 33 R407C pressure/temperature chart for subcooling only (liquid measurements)

Temperature Pressure Gauge Temperature Pressure Gauge Temperature Pressure Gauge

°F °C Psig kPa °F °C Psig kPa °F °C Psig kPa

36.0 2.2 73 500 59.0 15.0 114 786 94.0 34.4 203 1402

37.0 2.8 74 511 60.0 15.6 116 801 96.0 35.6 209 1444

38.0 3.3 76 522 61.0 16.1 118 815 98.0 36.7 216 1488

39.0 3.9 77 533 62.0 16.7 120 830 100.0 37.8 222 1532

40.0 4.4 79 544 63.0 17.2 123 845 102.0 38.9 229 1578

41.0 5.0 81 556 64.0 17.8 125 860 104.0 40.0 236 1624

42.0 5.6 82 567 65.0 18.3 127 875 106.0 41.1 242 1671

43.0 6.1 84 579 66.0 18.9 129 891 108.0 42.2 249 1720

44.0 6.7 86 591 67.0 19.4 131 906 110.0 43.3 257 1769

45.0 7.2 87 602 68.0 20.0 134 922 112.0 44.4 264 1819

46.0 7.8 89 615 69.0 20.6 136 938 114.0 45.6 271 1870

47.0 8.3 91 627 70.0 21.1 138 954 116.0 46.7 279 1922

48.0 8.9 93 639 72.0 22.2 143 987 118.0 47.8 287 1975

49.0 9.4 95 652 74.0 23.3 148 1021 120.0 48.9 294 2029

50.0 10.0 96 664 76.0 24.4 153 1055 122.0 50.0 302 2085

51.0 10.6 98 677 78.0 25.6 158 1090 124.0 51.1 310 2141

52.0 11.1 100 690 80.0 26.7 163 1126 126.0 52.2 319 2198

53.0 11.7 102 704 82.0 27.8 169 1163 128.0 53.3 327 2256

54.0 12.2 104 717 84.0 28.9 174 1201 130.0 54.4 336 2315

55.0 12.8 106 730 86.0 30.0 180 1239 132.0 55.6 345 2376

56.0 13.3 108 744 88.0 31.1 185 1279 134.0 56.7 354 2437

57.0 13.9 110 758 90.0 32.2 191 1319 136.0 57.8 363 2500

58.0 14.4 112 772 92.0 33.3 197 1360 138.0 58.9 372 2563

--------140.0 60.0 381 2628

NOTE

Use this table for subcooling calculation ONLY. See Table 32 for superheat or control
adjustment.

8.1 Calculating Subcooling

Example

Measure the liquid pressure (e.g., 200 psig). Find the liquid saturation temperature at that pressure
on Table 33 (e.g., 93°F). Measure the temperature of the liquid line (e.g., 90°F). Subtract the actual
temperature from the liquid saturation temperature to obtain the subcooling (e.g., 93 – 90 = 3°F). If
the actual temperature is greater than the liquid saturation temperature, then there is no subcooling,
and the fluid may be a mixture of liquid and vapor.

Why There Are Two R407C Temperature and Pressure Tables

R407C is a blend of refrigerants that exhibits a temperature “glide” of approximately 8 to 12°F
(4 to 7°C. This “glide” is the difference between the liquid and vapor saturation temperatures at a
given pressure. Use the correct table for the saturation temperature you need. Table 32 is for super­heat or operating controls. Table 33 is for subcooling only.

57

Ensuring The High Availability
Of Mission-Critical Data And Applications.

Emerson Network Power, the global leader in enabling business-critical
continuity, ensures network resiliency and adaptability through
a family of technologies—including Liebert power and cooling
technologies—that protect and support business-critical systems.
Liebert solutions employ an adaptive architecture that responds
to changes in criticality, density and capacity. Enterprises benefit
from greater IT system availability, operational flexibility and
reduced capital equipment and operating costs.

While every precaution has been taken to ensure the accuracy
and completeness of this literature, Liebert Corporation assumes no
responsibility and disclaims all liability for damages resulting from use of
this information or for any errors or omissions.
© 2008 Liebert Corporation
All rights reserved throughout the world. Specifications subject to change
without notice.
® Liebert is a registered trademark of Liebert Corporation.
All names referred to are trademarks
or registered trademarks of their respective owners.

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