H-IM-SCU
October 2015
Part No. 25008501
Screw Compressor Condensing Units
Installation and
Operations Manual
Table of Contents
General Safety Information .............................................2
Inspection .......................................................................2
Warranty Statement ........................................................2
Space and Location Requirements ................................3
Condensing Unit Rigging and Mounting .........................4
Head Pressure Control ....................................................4
Refrigerant Oils ...............................................................4
Recommended Refrigerant Piping Practices ..................5
Refrigeration Pipe Supports ...........................................5
Suction Lines ..................................................................6
Liquid Lines ....................................................................6
Unit Cooler Piping ...........................................................6
Line Sizing Tables ....................................................... 7-9
Evacuation and Leak Detection ....................................10
Refrigerant Charging Instructions.................................10
Field Wiring ...................................................................10
Check Out and Start Up ................................................11
Operational Check Out ..................................................11
System Balancing-Compressor Superheat ...................11
General Sequence of Operation .............................. 12-17
System Troubleshooting Guide .....................................18
Magnum Alarm and Safeties ........................................20
Magnum System Alarms ...............................................21
Setpoint Safety Alarms ........................................... 21-22
Preventive Maintenance Guidelines .............................23
Typical Wiring Diagrams ...............................................24
InterLink™ Replacement Parts ....................................26
