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Air-Cooled Models—Self-Contained Compressor
31
3.5 Air-Cooled Condenser with Liebert Lee-Temp “Flooded Condenser” Head
Pressure Control System
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.
Liebert Lee-Temp Piping
A discharge line and a liquid line must be field-installed between the indoor unit and the outdoor con-
denser. See Figures 17 and 18 for details.
Liebert Lee-Temp Controlled Materials Supplied
•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")
• 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
Lee-Temp Leak Check and Evacuation Procedure
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
Lee-Temp heater pads require a separate, continuous electrical source. See nameplate on unit
for proper voltage.
NOTE
Systems with scroll or digital scroll compressors include a factory-installed check valve and an
additional downstream Schrader valve with core in the compressor discharge line. Proper
evacuation of the condenser side of the compressor can be accomplished only using the
downstream Schrader valve. See piping schematic (Figure 18).