5. Turn on unit disconnect switch, and operate the unit for 30 minutes using the charging
function in the "Diagnostic" menu of the Liebert iCOM controller.
• A minimum 20psig (138kPa) must be established and maintained for the compressor to
operate.
• The charging function operates the compressor at full capacity and energizes the liquid-
line solenoid valve. The reheat and humidifier are disabled.
• The charging function can be reset as many times as required to complete unit charging.
6. Charge the unit until the liquid-line sight glass becomes clear. Then add an additional 1lb
(0.45kg) of refrigerant.
NOTE: A digital scroll compressor will have a clear sight glass only when operating at 100% capacity.
When operating below 100%, the sight glass may show bubbles with each 15-second unloading cycle.
Refrigerant-level Sight Glasses ontheLiebertLee-Temp Receiver
On the receiver(s) at the condenser are 2refrigerant-level sight glasses. Refrigerant level will vary with
outside temperature. Check refrigerant level after the unit has been on for at least 15 minutes.
Sight Glass Levels at Outdoor Temperatures
• 40°F (4.5°C) and lower—bottom sight glass is 3/4 full
• 40 to 60°F (4.5 to 15.5°C)—bottom sight glass is full
• 60°F (15.5°C) and higher—top sight glass is 3/4 full
5.2.6 Evacuation, Leak-testing andChargingAir-cooled Systems
withEEVandUnheatedReceivers
The PDX with EEV uses an unheated receiver to balance refrigerant requirements of the evaporator coil
and MCcondenser coil(s). See DPN00293
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 page29.
Evacuation and Leak-testing Air-cooled Systems withUnheated Receivers
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 the submittal-drawings appendix.
1. Open the electronic-expansion valves for evacuation.
2. Connect refrigerant gauges to the suction rotalock valve and discharge line Schrader valve.
3. 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.
Vertiv | Liebert® PDX™ and PCW™ Installer/User Guide | 45
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