Liebert 50, 8 Tons, 60 Hz User Manual

Precision Cooling For Business-Critical Continuity™

Liebert Mini-Mate2

User Manual - 8 Tons, 50 & 60Hz

™

TABLE OF CONTENTS

MODEL NUMBER NOMENCLATURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .V

1.0 PRODUCT FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

1.1 Standard Product Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

1.1.1 Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

1.1.2 Evaporator System Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

1.1.3 Condensing Unit Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

1.2 Optional Equipment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

1.2.1 Canister Humidifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

1.2.2 Electric Reheat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

1.2.3 SCR Electric Reheat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

1.2.4 Hot Gas Bypass (Condensing Units) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

1.2.5 Free-Cooling Coil (GLYCOOL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

1.2.6 Smoke Detector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

1.2.7 Firestat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

1.2.8 Filter Clog . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

1.3 Ancillary (Ship Loose Accessories) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.3.1 Single Point Power Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.3.2 Refrigerant Line Sweat Adapter Kits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.3.3 Return Air Filter Box with Duct Collar Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.3.4 Condensate Pump Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.3.5 Remote Monitoring and Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.3.6 Remote Sensors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2.0 SITE PREPARATION AND INSTALLATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2.1 Installation Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2.1.1 Room Preparation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2.1.2 Location Considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2.2 System Weights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2.3 Equipment Inspection upon receipt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2.4 Installing the Evaporator or Chilled-Water Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.4.1 Close Coupled Installations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

2.4.2 Evaporator Air Distribution. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

2.4.3 Piping Connections and Coolant Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

2.4.4 Electrical Connections, Evaporator or Chilled-Water Unit . . . . . . . . . . . . . . . . . . . . . . . . . . 17

2.5 Indoor Air-Cooled Centrifugal Fan Condensing Unit Installation . . . . . . . . . . . . . . . . . . . . 19

2.5.1 Location Considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

2.5.2 Ducting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

2.5.3 Piping Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

2.5.4 Electrical Connections - Condensing Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

2.6 Outdoor Air-Cooled Condensing Unit Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

2.6.1 Location Considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

2.6.2 Piping Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

2.6.3 Electrical Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

2.7 Indoor Water- and Glycol-Cooled Condensing Unit Installation. . . . . . . . . . . . . . . . . . . . . . 27

2.7.1 Location Considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

2.7.2 Piping Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

2.7.3 Electrical Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

2.8 Optional Equipment Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

2.8.1 Free-Cooling Coil (GLYCOOL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

2.9 Checklist for Completed Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

3.0 MICROPROCESSOR CONTROL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34

3.1 Feature Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

3.2 Main Menu <Menu>. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

3.3 Setpoints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

3.4 Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

3.5 Active Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

3.6 Alarm History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

3.7 Time. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

3.8 Date . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

3.9 Setback . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

3.10 Setup Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

3.10.1 Restart Time Delay. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

3.10.2 C/F Degrees. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

3.10.3 Humidity Control Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

3.10.4 Lead Compressor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

3.10.5 Show DIP Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

3.10.6 Valve Time (For Systems With a Modulating Chilled-Water Valve) . . . . . . . . . . . . . . . . . . . 38

3.10.7 CW Flush (For Systems With a Modulating Chilled-Water Valve). . . . . . . . . . . . . . . . . . . . . 39

3.11 Change Passwords . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

3.12 Calibrate Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

3.13 Alarm Enable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

3.14 Alarm Time Delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

3.15 Common Alarm Enable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

3.16 Custom Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

3.17 Custom Text . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

3.18 Run Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

4.0 SYSTEM PERFORMANCE MICROPROCESSOR CONTROLS . . . . . . . . . . . . . . . . . . . . . . . . . .45

4.1 Control Type Response Proportional Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

4.2 Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

4.2.1 Multi-Step Cooling, Compressorized Direct Expansion (DX) Systems . . . . . . . . . . . . . . . . . . 45

4.2.2 Chilled-Water Cooling (8 Ton) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

4.2.3 GLYCOOL Cooling (8 Ton) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

4.3 Reheat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

4.3.1 Electric Reheat - Staged. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

4.3.2 SCR Electric Reheat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

4.4 Dehumidification / Humidification Percent Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

4.4.1 Staged Dehumidification, Compressorized Direct Expansion (DX) Systems . . . . . . . . . . . . . 46

4.4.2 Humidification Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

4.4.3 Dehumidification Lockout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

4.5 Load Control Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

4.6 Communications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

5.0 ALARMS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

5.1 Alarms: Definitions and Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

5.1.1 Custom Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

5.1.2 High Head Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

5.1.3 Humidity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

5.1.4 Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

5.1.5 Humidifier Problem Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

5.1.6 High-Water Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

5.1.7 Loss of Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

5.1.8 Short Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

5.2 Optional/Custom Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

5.2.1 Change Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

5.2.2 Firestat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

5.2.3 Smoke Detector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

6.0 SYSTEM OPERATION, TESTING, AND MAINTENANCE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50

6.1 System Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

6.1.1 Environmental Control Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

6.1.2 Cooling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

6.1.3 Heating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

6.1.4 Humidification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

6.1.5 Dehumidification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

6.1.6 Remote Shutdown. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

6.2 Maintenance and Component Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

6.2.1 Electric Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

6.2.2 Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

6.2.3 Blower System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

6.2.4 Electric Reheat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

6.2.5 Refrigeration System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

6.2.6 Steam Generating Humidifier - Operation Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

6.2.7 Circuit Board Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

7.0 MAINTENANCE INSPECTION CHECKLIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

8.0 T

ROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .58

iii

FIGURES

Figure 1 System configurations—air cooled systems. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Figure 2 System Configurations—water/glycol systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Figure 3 System Configurations—chilled water systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Figure 4 Threaded rod and hardware kit installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Figure 5 Close coupled installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Figure 6 Drain installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Figure 7 Condensate pump installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Figure 8 General arrangement diagram - chilled-water systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Figure 9 Refrigerant piping diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Figure 10 Evaporator or chilled-water unit dimensional data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Figure 11 Evaporator unit electrical connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Figure 12 Piping connections - indoor air-cooled centrifugal fan condensing unit . . . . . . . . . . . . . . . . . . . . 20

Figure 13 Indoor air-cooled centrifugal condensing unit dimensions and pipe connections . . . . . . . . . . . . . 21

Figure 14 Indoor air-cooled centrifugal condenser electrical connections . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Figure 15 Electrical field connections - outdoor condensing unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Figure 16 Footprint dimensions - outdoor condensing unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Figure 17 Piping and electrical connections - outdoor condensing unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Figure 18 Indoor water/glycol condensing unit dimensional data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Figure 19 Indoor water/glycol condensing unit electrical field connections . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Figure 20 System piping with indoor water/glycol-cooled condensing unit . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Figure 21 Optional free cooling coil (3-way valve) on water/glycol units . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Figure 22 Optional free cooling coil (3-way valve) on air-cooled units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Figure 23 Wall box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Figure 24 Control menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Figure 25 Control board (inside evaporator) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Figure 26 Wall box board. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

TABLES

Table i Heat rejection matchup – 60 Hz. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v

Table ii Heat rejection matchup – 50 Hz. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v

Table 1 Application limits, evaporator and chilled-water units* . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Table 2 Application limits, indoor and outdoor air-cooled condensing units . . . . . . . . . . . . . . . . . . . . . . . . 4

Table 3 Application limits, indoor water/glycol-cooled condensing units . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Table 4 Unit weights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Table 5 Evaporator external static pressure (60) at 3750 CFM (6371 CMH) . . . . . . . . . . . . . . . . . . . . . . . 10

Table 6 Recommended refrigerant line sizes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Table 7 8-ton unit refrigerant charge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Table 8 Line charges (field piping)* . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Table 9 Refrigerant quick connect sizes and torque. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Table 10 Default setpoints and allowable ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Table 11 Night and weekend setback plan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Table 12 Setup functions, default values and allowable ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Table 13 Alarm default time delays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Table 14 Equipment switch settings (unit control board) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Table 15 Switch settings (wallbox board) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Table 16 Typical discharge pressures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Table 17 Humidifier control board DIP switch settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

Table 18 Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

MODEL NUMBER NOMENCLATURE

Evaporators and Chilled-Water Units

MMD96E-AHEL0 (example)

MM Mini-Mate2 MC Mini-Mate2 Indoor Condensing Unit

0 = No Disconnect

96E-

D = Disconnect D= Disconnect 96E- = 8-ton Evaporator, 60 Hz 95E- = 8-ton Evaporator, 50 Hz 95A = 8-ton Air-Cooled Centrifugal, 50 Hz 8TCD = 8-ton Chilled-Water w/ 2-way valve 98W = 8-ton Water/Glycol-Cooled, 60 Hz 8TCT = 8-ton Chilled-Water w/ 3-way valve 97W = 8-ton Water/Glycol, 50 Hz A = 460V-3ph-60 Hz B = 575V-3ph-60 Hz 2 = 2-way Water/Glycol reg valve, 150 psi C = 208V-3ph-60 Hz 3 = 3-way, Water/Glycol reg valve, 150 psi D =230V-3ph-60 Hz D = 2-way, Water/Glycol reg valve, 350 psi M = 380/415V-3ph-50 Hz T = 3-way, Water/Glycol reg valve, 350 psi 0 = No Humidifier H = Humidifier B = 575V-3ph-60 Hz 0 = No Reheat Y = 208/230V-3ph-60 Hz E= Electric Reheat M = 380/415-3ph-50 Hz S = SCR Reheat L = Low Fan Speed Drive, 2 hp H = Hot Gas Bypass H = High Fan Speed Drive, 3 hp 0 0 = Revision Level

0 = None A = Filter Clog B = Smoke Detector C = Firestat PF Prop Fan Condensing Unit

D = Filter Clog & Smoke Detector H H = Hot Gas Bypass

E = Filter Clog & Firestat F = Smoke Detector & Firestat 095A = 8-ton Air-Cooled, 50 Hz G = Filter Clog, Smoke Detector, & Firestat

96A

096A

L L = 95

0 0 = Revision Level

Indoor Condensing Units

MCD96ALA00 (example)

0 = No Disconnect

96A = 8-ton Air-Cooled Centrifugal, 60 Hz

L = Lee-temp Head Pressure Control (Air-Cooled)

A = 460V-3ph-60 Hz

0 = No Hot Gas Bypass

Prop Fan Condensing Units

PFC096A-AL0 (example)

096A = 8-ton Air-Cooled, 60 Hz

- = Standard Coil C = Coated Coil A = 460V-3ph-60 Hz B = 575V-3ph-60 Hz Y = 208/230V-3ph-60 Hz M = 380/415V-3ph-50 Hz

°F Ambient, Lee-temp

Table iii Heat rejection matchup – 60 Hz

Condensing Unit

Nominal Capacity

8 Tons MMD96E MCD96A PFC096A MCD98W

8 Tons MMD8TC Chilled Water Unit

Cooling

Unit

Indoor Air-Cooled

Centrifugal Fan

Outdoor Air-Cooled

Propeller Fan

Water/Glycol

Table iv Heat rejection matchup – 50 Hz

Condensing Unit

Nominal Capacity

8 Tons

Cooling

Unit

MMD95E MCD95A PFC095A MCD97W

MMD8TC Chilled Water Unit

Indoor Air-Cooled

Centrifugal Fan

Outdoor Air-Cooled

Propeller Fan

Indoor Remote

Water/Glycol Cooled

Indoor

1.0 PRODUCT FEATURES

1.1 Standard Product Features

The Mini-Mate2 is a temperature/humidity control system designed to be installed above a ceiling grid system. The unit is available as a split system evaporator to be matched with an Indoor Centrifugal Fan Condensing Unit, Outdoor Prop Fan Condensing Unit, or Indoor Water/Glycol Condensing Unit. A self-contained Chilled Water Fan Coil is also available.

1.1.1 Controls

The Mini-Mate2 system includes a wall-mounted display panel with a liquid crystal display (LCD) screen and a 7 membrane keypad. The control is menu-driven for ease of use. Figure 24, Section 3, depicts the complete menu tree for the control. All control setpoints and alarm setpoints are programmable.

1.1.2 Evaporator System Components

DX Evaporator Section

The evaporator section includes the evaporator coil, thermostatic expansion valves, filter dryers, and blower. The evaporator coil is constructed of copper tubes and aluminum fins and is designed for the high sensible heat ratio required for electronic equipment. Room air circulation is accomplished by a double inlet, belt driven centrifugal blower that has been dynamically balanced. The blower has selfaligning bearings. Both the blower and motor have permanently lubricated ball bearings.

Product Features

Chilled-Water Model

The Chilled-Water model is self-contained and is designed for use with an existing chilled-water loop. It contains a chilled-water coil and a proportional modulating valve to control the flow of chilled water.

1.1.3 Condensing Unit Components

The condensing unit is connected to the evaporator unit by four refrigerant lines and low voltage control wires. The condensing unit requires a power source and a power disconnect switch. A single point power kit is available for close coupled (attached) units.

Air-Cooled Condensing Unit (Indoor Centrifugal)

The Air-Cooled Condensing units (MC models) include: 3-ton and 5-ton scroll compressors with motor, belt-driven centrifugal blower, crankcase heaters, high pressure switches, condenser coils, and LeeTemp head pressure control with receivers.

Air-Cooled Condensing Unit (Outdoor Prop Fan)

Outdoor Air-Cooled Condensing Units (PFC models) include: 3-ton and 5-ton scroll compressors with crankcase heaters, high-pressure switch, condenser coils, direct-driven propeller fan, and Lee-Temp head pressure control with receivers.

Water/Glycol Condensing Unit (Indoor)

The Water/Glycol-Cooled Condensing units include: 3-ton and 5-ton scroll compressors with crankcase heaters, high pressure switches, coaxial condensers, and regulating valves. Drycooler and pumps are selected separately for glycol systems.

1.2 Optional Equipment

1.2.1 Canister Humidifier

The optional, factory-installed steam generating humidifier adds pure water vapor to the room air to control humidity. Room humidity setpoints are established by the user. The humidifier components include: a steam canister (replaceable), control board, inlet strainer, fill and drain valves.

1.2.2 Electric Reheat

The 304/304 stainless steel electric reheat is energized when required to heat room air or to control room temperature during dehumidification. A safety switch prevents the reheat from exceeding temperature limits.

1.2.3 SCR Electric Reheat

The 304/304 stainless steel reheat is pulsed rapidly to provide precise temperature control, while cooling is locked on. A safety switch prevents the reheat from exceeding temperature limits.

1.2.4 Hot Gas Bypass (Condensing Units)

This optional system bypasses compressor discharge around the condenser directly to suction to provide capacity control and reduce compressor cycling. System includes liquid injection valve to maintain proper suction superheat. Hot gas bypass is provided on both circuits.

1.2.5 Free-Cooling Coil (GLYCOOL)

Product Features

When ambient temperatures are low enough, cold fluid is piped to a secondary coil or a separate source of chilled-water may be piped to this coil.

1.2.6 Smoke Detector

If smoke is detected in the return air, the unit display sounds an audible signal and the unit shuts down.

1.2.7 Firestat

When the return air temperature limit of approximately 125°F (51.7°C) is exceeded, the unit shuts down.

1.2.8 Filter Clog

If high pressure differential is detected across the return air filter, an adjustable pressure differential switch sounds an audible signal.

1.3 Ancillary (Ship Loose Accessories)

1.3.1 Single Point Power Kit

A Single Point Power Kit allows the connection of a system (Evaporator and indoor condensing unit) to a single power source when the units are close coupled. The kit includes a junction box with power distribution, sub-fusing, and evaporator and condenser wiring.

1.3.2 Refrigerant Line Sweat Adapter Kits

This kit includes the compatible fittings required (four suction and four liquid line connections) when using field supplied interconnecting refrigerant piping.

1.3.3 Return Air Filter Box with Duct Collar Kit

A return air filter box with duct flange, 4" (102 mm) filter, and a supply air duct flange are provided for ducting the evaporator air.

1.3.4 Condensate Pump Kit

A condensate pump is required when the evaporator is installed below the level of the gravity-fed drain line. Components include: the pump; check valve; sump; level sensor; float switch; and controls. Refer to detailed instructions and drawings supplied with the pump.

1.3.5 Remote Monitoring and Control

Liebert can provide a variety of remote monitoring and control devices to enhance your Mini-Mate2 system. These include water detection, remote monitoring of a single unit, and remote control/monitoring of multiple units.

Product Features

1.3.6 Remote Sensors

Remote temperature/humidity sensors can be mounted in the controlled space or in duct work and includes 30 feet of control cable.

2.0 SITE PREPARATION AND INSTALLATION

NOTE

Before installing unit, determine whether any building alterations are required to run piping, wiring, and duct work. Carefully follow all unit dimensional drawings and refer to the submittal engineering dimensional drawings of individual units for proper clearances.

2.1 Installation Considerations

The evaporator unit is usually mounted above the suspended ceiling using field supplied threaded rods. Refer to Figure 1 for possible configurations. The condensing unit may be:

• Indoor Air-Cooled Centrifugal Fan Condensing Unit mounted remotely or close coupled to the evaporator in the ceiling space.

• Outdoor Air-Cooled Propeller Fan Condensing Unit.

• Indoor Water/Glycol-Cooled Condensing Unit, mounted remotely or close coupled to the evaporator.

Table 1 Application limits, evaporator and chilled-water units*

Input Voltage Range of Return Air Conditions to Unit

Min Max Dry Bulb Temp. Relative Humidity

-5% +10%

*Unit will operate at these conditions but will not control to these extremes.

65°F to 85°F

°C to 29°C)

(18

20% to 80%

Site Preparation and Installation

Table 2 Application limits, indoor and outdoor air-cooled condensing units

Input

Voltage

Min Max Min Max

Outdoor Prop Fan Condensing Unit

-5% +10%

Indoor Air-Cooled Centrifugal Condensing Unit

Table 3 Application limits, indoor water/glycol-cooled condensing units

Input Voltage Entering Fluid Temperature

Min Max Min Max

-5% +10% 65°F (18.3°C) * 115°F (46°C)

*Operation below 65°F (18°C) may result in reduced valve life and fluid noise.

2.1.1 Room Preparation

The room should be well-insulated and must have a sealed vapor barrier. The vapor barrier in the ceiling and walls can be a polyethylene film. Paint on concrete walls and floors should be vapor resistant.

NOTE

The single most important requirement for maintaining environmental control in the conditioned room is the vapor barrier.

Condensing Units Entering Dry Bulb

Air Temperature

°F (-34°C)

-30

°F (-29°C)

-20

120

°F (49°C)

°F (46°C)

115

Outside or fresh air should be kept to a minimum when tight temperature and humidity control is required. Outside air adds to the cooling, heating, dehumidifying and humidifying loads of the site. Doors should be properly sealed to minimize leaks and should not contain ventilation grilles.

2.1.2 Location Considerations

CAUTION

Units contain water. Water leaks can cause damage to sensitive equipment below. DO NOT MOUNT UNITS OVER SENSITIVE EQUIPMENT. A field-supplied pan with drain must be installed beneath cooling units and water/glycol-cooled condensing unit.

NOTE

Do not mount units in areas where normal unit operating sound may disturb the working environment.

Locate the evaporator unit over an unobstructed floor space if possible. This will allow easy access for routine maintenance or service. Do not attach additional devices to the exterior of the cabinet, as they could interfere with maintenance or service.

Site Preparation and Installation

Figure 1 System configurations—air cooled systems

Site Preparation and Installation

Evaporator

Prop Fan

Condensing Unit

Evaporator

Figure 2 System Configurations—water/glycol systems

Cooling

Tower

Centrifugal Fan

Condensing Unit

Evaporator

Condensing Unit

Water/Glycol

WATER-COOLED SYSTEMS

GLYCOL-COOLED SYSTEMS

Drycooler

Evaporator

Water/Glycol

Condensing Unit

Figure 3 System Configurations—chilled water systems

Evaporator

CHILLED-WATER SYSTEMS

Condensate Pump

Site Preparation and Installation

COUPLED COMPONENTS

(AIR-COOLED SYSTEM

Evaporator

Condensing

Unit

2.2 System Weights

Table 4 Unit weights

Cooling Units* lbs kg

MMD96E 665 302

MMD95E 665 302

Condensing Units lbs kg

MCD96A 530 241

MCD95A 530 241

MCD98W 470 213

MCD97W 470 213

*Add 40 lbs. (20 kg.) to units with free cooling or hot water reheat coils.

2.3 Equipment Inspection upon receipt

When the unit arrives, do not uncrate equipment until it is close to its final location. All required assemblies are banded and shipped in corrugated containers. If you discover any damage when you uncrate the unit, report it to the shipper immediately. If you later find any concealed damage, report it to the shipper and to your Liebert supplier.

Condensate Pump

2.4 Installing the Evaporator or Chilled-Water Units

WARNING

Be sure the supporting roof structure is capable of supporting the weight of the unit(s) and the accessories during installation and service. (See 2.2 - System Weights.)

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

The evaporator unit and indoor condensing unit are 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 1/2"-13 tpi threaded suspension rods and 1/2"-13 tpi hardware kit.

Recommended clearance between ceiling grids and building structural members is unit height plus 3 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.

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, springs, and washers. (See Figure 4). The coil springs provide vibration isolation.

Site Preparation and Installation

1. Use the plain nuts to hold unit in place. Adjust these nuts so that the weight of the unit is supported by the four rods, does not rest on the ceiling grid, and is level. Ensure none of the springs are compressed to solid height. The coil side of the unit is heavier, so these springs will be compressed more than the other side.

NOTE

The units must be level in order to drain condensate properly.

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

Figure 4 Threaded rod and hardware kit installation

1" O.D. spring

1/2" flat washer

1/2" Nylock locking nut

1/2" threaded rod (supplied by field)

hanging bracket

base pan (ref)

1/2" hex nut

2.4.1 Close Coupled Installations

If the evaporator and condensing units are to be mounted side-to-side (close coupled), hang each unit before connecting them together (See Figure 5). If Single Point Power Kit is used, install the box into the evaporator prior to suspending the units. Route power wire flex conduit into condensing unit as units are suspended. Refer to instructions supplied with kit for details. Align bolt holes in the condensing unit and in the evaporator. Insert rubber spacers and secure four (4) sets of hardware provided. Align the refrigerant connections and tighten them as described in 2.4.3 - Piping Connections and Coolant Require- ments. Remove “P” clamps from piping to aid fitting alignment.

Figure 5 Close coupled installation

Evaporator

Site Preparation and Installation

Condensing Unit

Isolator rubber

5/16" lock washer

5/16" capscrew

Cage nut

NOTE: Disconnect P-clamps on lines in the evaporator for easy close coupling. P-clamps are for shipping purposes only.

5/16" flat washer

2.4.2 Evaporator Air Distribution

Filter Box

The optional filter box mounts directly to the return air opening of the evaporator. The filter box is supplied with two (2) 20% (Liebert part no. A-0320) or 30% (Liebert part no. A-0400) 25" x 20" x 4" filters.

NOTE

Do not operate the unit without filters installed in return air system.

Connections for Ducted Systems

Use flexible duct work or non-flammable cloth collars to attach duct work to the unit and to help control the transmission of vibrations to building structures. Insulation of duct work is vital to prevent condensation during the cooling cycle. The use of a vapor barrier is required to prevent absorption of moisture from the surrounding air into the insulation.

If the return air duct is short, or if noise is likely to be a problem, sound-absorbing insulation should be used on the duct. Duct work should be fabricated and installed in accordance with local and national codes.

Table 5 Evaporator external static pressure (60) at 3750 CFM (6371 CMH)

2 hp Motor (std) 3 hp Motor (opt)

Turns

Open

0n/a n/a 1146 1.9

0.5 n/a n/a 1125 1.8

1n/a n/a 1104 1.7

1.5 946 0.9 1083 1.6

2 922 0.8 1063 1.5

2.5 972 0.7 1042 1.4

3 899 0.6 1021 1.3

3.5 851 0.5 1000 1.2

4 828 0.4 979 1.1

4.5 804 0.3 958 1.0

5 780 0.2 938 0.9

5.5 757 0.1 917 0.8

6 733 0 896 0.7

If free-cooling or hot water coil is ordered, reduce available external static pressure by 0.3" (8 mm). Contact Liebert Representative for other Air Volumes. Factory setting is 0.5" (13 mm) with 2 hp motor. Field adjust to suit application.

RPM

External

Static, in. RPM

External

Static, in.

Site Preparation and Installation

NOTE

Maximum return air static pressure should not exceed 0.3" (8 mm) to provide proper drainage of the unit.

2.4.3 Piping Connections and Coolant Requirements

Drain Line

CAUTION

The drain line must not be trapped outside the unit, or water may back-up in drain pan. Drain is internally trapped.

This line may contain boiling water. Use copper or other suitable material for the drain line. Sagging condensate drain lines may inadvertently create an external trap.

A 3/4 in. (19.1 mm) female pipe thread (FPT) connection is provided for the evaporator coil condensate drain. This 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 the full size of the drain connection.

The evaporator drain pan includes a float switch to prevent unit operation if drain becomes blocked.

Figure 6 Drain installation

Site Preparation and Installation

Unit

Continuous slope

away from unit

Unit

Do not externally

trap the unit

IncorrectCorrect

Unit

These are external traps also, although unintentional. Lines must be rigid enough to not bow between supports. Humidifier drain water can approach 100° Celsius.

Incorrect

Condensate Pump

The optional condensate pump kit is required when the evaporator is installed below the level of the gravity-fed drain line. Refer to the installation instructions provided with the condensate pump kit.

Figure 7 Condensate pump installation

Drain Line (field supplied)

Condensate Pump

AIR INLET

Site Preparation and Installation

3/8" Compression Fitting Drain Connection

Power Supply from Electric Service Power Block in Fan/Coil Module.

Evaporator or

Chilled Water

Unit

10 9/16 "

(268.3mm)

Condensate Pump Support Bracke

6 5/8 "

(168.3mm)

3/4" (13mm) Supplied on Pump Tank

Hose Barb

Notes:

1. 3/4" (13mm) Flexible Rubber Tubing Assembly (Supplied with Pump Kit) must be installed on pump end.

2. The High Water Safety Float included with pump must be interlocked with unit control. Wire to terminals 60 & 61 on Evaporator terminal strip to shut down unit.

Humidifier Water Supply Line

21 1/2 "

(546mm)

FRONT OF UNIT

Condensate Drain

3/4" (13mm) FPT Customer Connection

Flexible Rubber Tubing

DPN000239_Rev0

Units supplied with the optional humidifier package have a 1/4 in. (6.4 mm) FPT connection for water inlet. Supply pressure range is 10 psig to 150 psig. Required flow rate is 1 gpm. A shut-off valve should be installed in this line to isolate the humidifier for maintenance.

NOTE

DO NOT route humidifier supply line in front of filter box access panel.

Chilled-Water Piping—Chilled-water Systems Only

Refer to Figure 8 for recommended field installed hardware such as shut-off valves and hose bibs.

Chilled-water supply and return lines must be insulated to prevent condensation.

The minimum recommended water temperature is 42°F. Connection sizes are 1-1/4" FPT.

Figure 8 General arrangement diagram - chilled-water systems

Bleed Valve

Chille Water Supply

Chilled Water

Retu

** Shutoff Valves

Female Adapters

Chilled Water Control Valve

Site Preparation and Installation

Chilled Water Coil

** Hose Bibs

* Field piping refers to the use of hard piping using sweat adapter kit or precharged line set.

** Component Liebert but are recommended for proper circuit operation and maintenance.

s are not supplied by

Suppl

Return

3 - Way Chilled Water Control Valve (Optional)

FIELD PIPING

FACTORY PIPING

DPN000236_Rev0

Site Preparation and Installation

Refrigerant (R-22) Piping

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

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

• Close coupling the units together using the quick connects.

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

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. 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 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.

Table 6 Recommended refrigerant line sizes

Equivalent

Feet Circuit Liquid Line

50 feet 3-ton 3/8" O.D. 7/8" O.D.

100 feet 3-ton 1/2" O.D. 7/8" O.D

150 feet 3-ton 5/8" O.D. 1-1/8" O.D

50 feet 5-ton 1/2" O.D. 1-1/8" O.D

100 feet 5-ton 5/8" O.D. 1-1/8" O.D

150 feet 5-ton 5/8" O.D. 1-3/8" O.D

Consult your Liebert representative for longer line lengths.

Suction

Line

NOTE

If field supplied refrigerant piping is installed, refrigerant (R-22) must be added to the system.

Figure 9 Refrigerant piping diagram

Evaporator

Suction Line Piping Condensing Unit Below Evaporator

Evaporator

Pitch down 1/2" per 10 feet

NOTE: When installing remote condensing units below the evaporator, the suction gas line should be trapped with an inverted trap to the height of the evaporator. This prevents refrigerant migration to the compressors during off cycles. Maximum recommended vertical drop to condensing unit is 20 feet (6.1 m).

Condensing Unit

Suction Line Piping Condensing Unit Above Evaporator Traps recommended every 25 feet (7.6 m) of vertical rise.

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