Emerson Liebert MC Microchannel Outdoor Condenser 28 - 220kW 用户手册

Risk of control malfunction. Can cause improper unit operation.
Make sure that all low-voltage electrical wiring has been performed per the schematic 

diagram provided and that all low-voltage wiring connections are tight.

Premium Efficiency Control condensers are designed to use CANbus communication between Liebert 

MC and Liebert iCOM

®

 control on indoor unit. The CANbus wiring is field-supplied and must be:

• shielded
• 24-18AWG stranded tinned copper
• twisted pair (minimum 8 twists per foot)
• low capacitance (17pf/ft or less)
• plenum rated (NEC type CMP) if required by local codes
• UV and moisture resistant or run within conduit once in an outdoor environment, and must be 

temperature and voltage rated for conditions present.
Examples: Belden part number 89207(plenum rated) or Alpha Wire part number 6454 (UV 

resistant outdoor rated) category 5, 5e or higher. 

Do not run the CANbus cable in the same conduit, raceway or chase used for high-voltage wiring. For 

CANbus network lengths greater than 350ft (107m), contact Emerson for assistance. The CANbus 

wiring is for communicating directly with future versions of the Liebert iCOM, but is not currently 

active. When CANbus wiring is installed, place a jumper between Terminals 70/71/230. Contact 

Liebert Precision Cooling Support for additional information relative to availability of iCOM software 

versions that communicate directly to the condenser.
Premium Efficiency Control condensers are also designed to operate with Terminals 70 and 71 wired 

to indoor unit compressor contactor side switch to indicate compressor on signal. For dual circuit 

condensers, also use Terminal 230. These signals are required if CANbus communication with Liebert 

iCOM is not used.