Vertiv Liebert XDC User Manual

4.7.1 Air-Cooled Condenser with Liebert Lee-Temp “Flooded Condenser” Head Pressure
Control System—R-407C (DX) Circuit
The Liebert Lee-Temp system consists of a modulating type head pressure control valves and insulated
receivers with heater pads to ensure operation at ambient temperatures as low as -30°F (-34.4°C).
Liebert Lee-Temp Piping
Two discharge lines and two liquid lines must be field-installed between the indoor unit and the outdoor
condenser. See 4.6.2 on page45 and 4.6.2 on page45 for details.
Liebert Lee-Temp Control Materials Supplied
• Built-in, pre-wired condenser control box
• Air-cooled condenser
• Piping access cover to be reinstalled when piping is complete
• Bolts—four per leg (3/8" x 5/8")
• Terminal block for two-wire, 24V interlock connection between unit and condenser
• Condensate legs—four with one-fan, six on two-and three-fan models and eight on four-fan
models
• Bolts—used to mount receiver (3/8" x 1-1/4")
• Liebert Lee-Temp system:
• Insulated storage receiver—one per circuit
• Head pressure control assembly (head pressure valves and check valves) - one per
circuit
• Service valve—one per circuit
• Pressure relief valve—one per circuit
• Liquid level sight glasses
NOTE: Liebert Lee-Temp heater pads require a separate, continuous electrical source. See nameplate
on unit for proper voltage.
Evacuation and Leak Check—R-407C (DX) Circuit (Air and Water/Glycol Systems)
1. If unit power is available, open the unit’s liquid line and hot gas valve solenoid valves using the
Tandem Bank 1 and Tandem Bank 2 evacuation function in the Liebert iCOM’s Service Menu. If
power is not available to the unit, a field-supplied 24VAC/75VA power source must be directly
connected to each of the unit’s solenoid valves..
NOTE: The procedures above allow the technician to use 24VAC power and controls to open liquid line
solenoid valve(s) for the dehydration process. If no power is at the unit disconnect, the technician is to
use a separate 24VAC source rated at 75 VA and connect to the system liquid line solenoid valve(s)
directly.
2. Attach refrigerant gauges to the suction and discharge service valves of the compressor.
3. Open all compressor service valves, including those located outside the Liebert XDC.
4. Connect the tank of dry nitrogen to the Schrader valves on the liquid lines and the hot gas
lines.
5. Pressurize the system circuit(s) to 150 PSIG (1034 kPa; 10.34 bars) with dry nitrogen with a
trace of refrigerant. Check the system for leaks with a suitable leak finder.
Vertiv | Liebert® XDC™ User Manual | 54

Vertiv Liebert XDC Specifications

General

Brand	Vertiv
Model	Liebert XDC
Category	Freezer
Language	English