Pipe Diameter, in. Oil Volume, oz (ml)
7/8 0.9 (26.6)
1-1/8 1.8 (53.2)
1-3/8 3.3 (97.6)
1-5/8 5.5 (162.7)
Source: DPN003950, Rev. 6
Table 5.10 Volume of Oil in Standard Form Trap by Pipe Diameter (continued)
5.5 Evacuation, Leak Testing, and Charging Air Cooled Systems
Two discharge lines and two liquid lines must be field installed between the indoor unit and outdoor condenser.
NOTE: Keep the evaporator unit and condenser closed with their factory charge of dry nitrogen while all field piping is
installed. Keep the field piping clean and dry during installation. Do not allow it to stand open to the atmosphere.
When all the field interconnecting piping is in place, vent the dry nitrogen charge of each evaporator unit, making its
piping connection last. Follow all proper brazing procedures, including a dry nitrogen purge to maintain system
cleanliness. The condenser connection pipes must be wrapped with a wet cloth to keep the pressure and temperature
sensors cool during any brazing.
5.6 Evacuation and Leak Testing Air Cooled Systems
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
page107 .
1. Starting with Circuit #1, open the service valves and place a 150 psig (1,034 kPa) of dry nitrogen with a tracer of
refrigerant. Check the system for leaks with a suitable leak detector.
2. With pressure still in Circuit #1, open the compressor service valves in Circuit #2.
• If pressure increases in Circuit #2, the system is cross-circuited and must be re-checked for proper piping.
• If there is no pressure increase, repeat Step 1 on Circuit #2.
• Check pressure on fluid side of unit. If pressure has risen over starting pressure (should be 30 psig or less),
the BPHE is leaking from the refrigerant to water side and should be replaced.
3. After completion of leak testing, release the test pressure (observe local code) and pull an initial deep vacuum of
500 microns on the system with a suitable pump.
4. After four hours, check the pressure readings and if they have not changed, break vacuum with dry nitrogen. Pull
a second and third vacuum to 500 microns or less. Re-check the pressure after two hours.
5. When the three checks are complete, remove the jumper hose from the service valve fitting and the condenser.
Proceed to Charging the Refrigerant Circuit to an Outdoor Air Cooled Condenser with Receivers ( MCV440) on
the facing page or Charging the Refrigerant Circuit to an Outdoor Air Cooled Condenser without Receivers (
MCV430) on page1.
54 Proprietary and Confidential ©2024 Vertiv Group Corp. 5 Refrigerant Piping Requirements
Vertiv™ CoolPhase CDU Installer/User Guide
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