37MGHAQ: Installation Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
30
Fig. 29 —Evacuation Instructions
Fig. 30 — Service Port
13. Using a hexagonal wrench, fully open both the high pressure and low
pressure valves.
14. Tighten valve caps on all three valves (service port, high pressure, low
pressure) by hand. You may tighten it further using a torque wrench if
needed.
Deep Vacuum Method
The deep vacuum method requires a vacuum pump capable of pulling a
vacuum of 500 microns and a vacuum gauge capable of accurately mea-
suring this vacuum depth. The deep vacuum method is the most positive
way of assuring a system is free of air and liquid water (Fig. 31).
A22025
Fig. 31 — Deep Vacuum Method
Triple Evacuation Method
The triple evacuation is the recommended method of dehydration. Refer
to Fig. and proceed as follows:
1. Pump the system down to 1500 microns and allow the pump to contin-
ue operating for an additional 15 minutes.
2. Close the service valves and shut off the vacuum pump.
3. Connect a dry nitrogen cylinder and regulator to the system and break
vacuum until the system reaches 2 psig.
4. Close the service valve and allow the system to stand for 1 hr. During
this time, the dry nitrogen can diffuse throughout the system absorbing
moisture.
5. Pump the system down to 1000 microns.
6. Break the vacuum with dry nitrogen (2 psig).
7. Pump the system down to 500 microns.
8. Perform the hold test for 30 minutes.
A22026
Fig. 32 — Triple Evacuation Method
NOTE ON ADDING REFRIGERANT
Depending on the length of connective piping or the pressure of the
evacuated system, you made need to add refrigerant. Refer to Table 17.
Refrigerant charging must be performed after wiring, vacuuming,
and the leak testing.
DO NOT exceed the maximum allowable quantity of refrigerant
or overcharge the system. Doing so can damage the unit or impact
it’s functioning.
Charging with unsuitable substances may cause explosions or
accidents. Ensure that the appropriate refrigerant is used.
Refrigerant containers must be opened slowly. Always use
protective gear when charging the system.
DO NOT mix refrigerants types.
CAUTION
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