Liebert PW017 User Manual

5.2.5 Evacuation, Leak-testing, and Charging Air-cooled Systems 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
receiver with heater pad to ensure operation at ambient temperatures as low as -30°F (-34.4°C). The
Liebert Lee-Temp system can be used with any PDX compressor or expansion-valve choice.
A discharge line and liquid line must be field-installed between the indoor unit and the outdoor
condenser. See the appropriate piping schematic, listed in Table 5.1 on page29.
Liebert Lee-Temp-controlled Materials Supplied
• Built-in, pre-wired condenser control box
• Air-cooled condenser
• Piping access cover
• Bolts—4per leg (3/8in. x 5/8in.)
• Terminal block for 2-wire, 24-V interlock connection between unit and condenser
• Terminal blocks for shielded, CANbus-cable connection between unit and condenser
• Condenser legs—4with 1-fan units and 5with 2-fan units
• Bolts—6per receiver (3/8in. x 1in.)
• Liebert Lee-Temp system:
• Insulated storage receiver with (2) liquid-level sight glasses—1
• Head-pressure control-valve piping assembly with (2) integral check valves—1
• Service valve—1
• Pressure-relief valve—1Pressure-relief valve—1
NOTE: The Lee-Temp heater pad requires a separate, continuous electrical source. See nameplate on
unit for proper voltage.
Evacuation and Leak-testing Air-cooled Systems withLiebertLee-Temp Receiver
For proper leak-check and evacuation, you must open all system valves and account for all check valves.
NOTE: The system includes 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 the appropriate
piping schematic for your system in Submittal Drawings on page106.
1. If unit power is available, open the unit liquid-line solenoid valve or electronic-expansion valve
(EEV) using the evacuation function in the diagnostic section of the Liebert iCOM® control.
– or –
If unit power is not available, connect a field-supplied 24-VAC/75-VA power source directly to
the unit solenoid valve.
NOTE: Unit power is required for PDX with EEV.
2. Connect 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. Seat the service valve
approximately two(2) turns from the fully back-seated position.
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Liebert PW017 Specifications

General

Brand	Liebert
Model	PW017
Category	Control Unit
Language	English