Vertiv CoolPhase CDU - Break Vacuum; Charging the Refrigerant Circuit to an Outdoor Air Cooled Condenser with Receivers ( MCV440)

5.6.1 Break Vacuum
Using a manifold charging hose equipped with a ball valve, properly connect to a tank of refrigerant, and purge the hose with
refrigerant to ensure non-condensables do not enter the system. Connect the hose assembly to the liquid line Schrader port
and break circuit vacuum with a portion of the calculated refrigerant pre-charge. Add enough refrigerant to bring pressure
slightly above positive. Close ball valve and remove refrigerant tank.
5.7 Charging the Refrigerant Circuit to an Outdoor Air Cooled
Condenser with Receivers ( MCV440)
NOTICE
Risk of improper refrigerant charging. Can cause equipment damage.
R-410A is a blended refrigerant and must be introduced and charged from the cylinder only as a liquid.
Care must be exercised to avoid damage to the compressor. We recommend connecting a manifold charging
hose equipped with a ball valve to the liquid line Schrader port.
NOTICE
Risk of improper operation. Can cause compressor failure.
Operating the unit with the EEV closed can cause compressor failure. A minimum of 20 psig (138 kPa) must be
established and maintained for the compressor to operate. The charging function can be reset as many times as
required to complete.
NOTICE
Units should never be operated with no refrigerant charge, holding charge, proper load, or without additional oil
as required. Tag out system to prevent unauthorized personnel from accidentally starting equipment and
damaging compressors if any of these conditions exist.
To charge the system:
1. Check the nameplate on the indoor unit for the refrigerant type to be used. Unit control configurations differ
depending upon the refrigerant type.
2. Charge one unit at a time. Refer to Checklist for Completed Installation on page85 .
3. Calculate the amount of charge for the system. See Refrigerant Charge Requirements for Air Cooled Systems on
page50 .
4. Add Additional Compressor and trap oil. See Additional Oil Requirements for Scroll and Digital Scroll
Compressors on page51 .
5. Accurately weigh in about 80% of the calculated system charge before starting the unit. Do not exceed the
calculated charge by more than 0.5 lb (0.37 kg).
6. Close the Vertiv™ Liebert® MCV heat rejection skid disconnect switch.
5 Refrigerant Piping Requirements Proprietary and Confidential ©2024 Vertiv Group Corp. 55
Vertiv™ CoolPhase CDU Installer/User Guide