Emerson 3000 User Manual

The Liebert Lee-Temp system consists of a modulating type head pressure control valve and insulated 

receivers with heater pads to ensure operation at ambient temperatures as low as -30°F (-34.4°C). 

The Liebert Lee-Temp system can be used with any compressor choice.

A discharge line and a liquid line must be field-installed between the indoor unit and the outdoor 

condenser. See Figures 17 and 18 for details. 

• Built-in,  pre-wired  condenser control box
• Air-Cooled condenser
• Piping access cover to be reinstalled when piping is complete (models with one to four fans only)
• Bolts—four per leg (3/8" x 5/8")
• Terminal block for two-wire, 24V interlock connection between unit and condenser
• Condenser legs—four with 1-fan, six on two-, three- and six-fan models and eight on four- and 

eight-fan models

• Bolts—six per receiver (3/8" x 1")
• Liebert Lee-Temp system:

• Insulated storage receiver
• Head pressure control valve with integral check valve
• Service valve
• Pressure relief valve
• Liquid level sight glass
• Check  valve

Proper leak check and evacuation can be accomplished only with all system solenoid valves open and 

check valves accounted for. 

1. If unit power is available, open the unit liquid line solenoid valves using the evacuation function 

in the diagnostic section of the Liebert iCOM

®

 control. If unit power is not available, a field-

supplied 24VAC / 75VA power source must be directly connected to each of the unit solenoid 

valves.

2. Attach a jumper hose from the service valve fitting on the outlet of the receiver and the Schrader 

fitting on the discharge header of the condenser. Front-seat the service valve approximately 

two (2) turns.

3. For scroll and digital scroll compressors, connect refrigerant gauges to the suction rotalock valves 

and discharge line Schrader valves (see Note above).

4. Open the service valves and place a 150 PSIG (1034 kPa) of dry nitrogen with a tracer of 

refrigerant. Check system for leaks with a suitable leak detector. 

5. After completion of leak testing, release the test pressure (per local code) and pull an initial deep 

vacuum on the system with a suitable pump.

NOTE
Liebert Lee-Temp heater pads require a separate, continuous electrical source. See nameplate 

NOTE
Systems with scroll or digital scroll compressors include a factory-installed check valve and an