Emerson Liebert MC Microchannel Outdoor Condenser 28 - 220kW User Manual

The Liebert MC condenser is a low-profile, direct-drive propeller fan-type air-cooled unit suitable for 

mounting outdoors. It provides heat rejection for either one or two separate refrigeration circuits, 

matches the heat rejection capacity corresponding with the outdoor ambient temperature, and with 

each corresponding compressor heat rejection requirements. Constructed with an aluminum cabinet, 

galvanized steel frame and microchannel coil, the unit is quiet and corrosion resistant. The condenser 

is quickly and easily installed, because all internal wiring is completed at the factory with only 

electrical connections to be made at the job site. All electrical connections and controls are enclosed in 

an integral weatherproof section of the condenser.

Premium Efficiency Controls and EC fans are matched to provide superior system energy efficiency. 

The premium control board allows CANbus communication with the indoor unit’s Liebert iCOM

®

 

control. This communication feature provides compressor run signals, condenser operating mode 

changes, condenser alarm monitoring, simplified system charging procedures and outdoor ambient 

temperature monitoring. The EC fan is an integral assembly of an electronically commutated motor, 

quiet fan blade assembly and finger/hail guard. The fans are controlled by the premium control board 

using pressure transducer signals from the refrigerant circuit and factory programming to control the 

refrigerant head pressure.
The premium control board uses inputs from the indoor unit, condenser refrigerant pressures and 

temperatures and ambient temperatures to modulate the EC fan motor speed from 0 to 100% RPM, 

maintaining refrigerant head pressure setpoints. The control board, EC fan(s) and transducer(s) are 

factory-wired. Dual refrigeration circuit condensers adjust fans of each circuit independently to match 

each circuit’s head pressure conditions. Multiple fan single refrigeration circuit condensers adjust all 

fans to the same RPM to maintain head pressure. The control system provides refrigerant head 

pressure control for outdoor ambient temperatures as low as -30°F (-35°C), provided that the total 

design range (from minimum to maximum) is 125°F (70°C) or less. Liebert Lee-Temp

™

 kits are 

required only when the design temperature ranges exceed 125°F (70°C) for standard match ups and 

115°F (65°C) for Liebert Quiet-Line

™

 match ups.