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Air Vacuumizing
Refrigerant Pressure Inspection
Air-returning Low-pressure Range of Refrigerant
R290: 0.4-0.6Mpa; Air-exhausting High-pressure
Range: 1.5-2.0Mpa;
Air-returning Low-pressure Range of Refrigerant R32:
0.8-1.2Mpa; Air-exhausting High-pressure Range:
3.2-3.7Mpa;
It means that the refrigerating system or refrigerant of
an air conditioner is abnormal if the air-exhausting and
air-returning pressure ranges of the detected
compressor exceed the nor mal ranges to a large extent.
vacuum pump
service port
1.Use a spanner to take down the protective caps from
the service port, low pressure valve and high pressure
valve of the outdoor unit.
2.Connect the pressure hose of manifold gauge to the
service port on the outdoor unit low pressure valve.
3.Connect the charge hose from the manifold gauge
to the vacuum pump.
4.Open the low pressure valve of the manifold gauge
and close the high pressure valve.
he vacuuming time should not be less than 15
minutes, or make sure the compound gauge
indicates -0.1 MPa (-76 cmHg)
7.Close the low pressure valve of the manifold gauge
and turn off the vacuum.
8.Hold the pressure for 5 minutes, make sure that the
rebound of compound gauge pointer does not
exceed 0.005 Mpa.
9.Turn the low pressure valve counterclockwise for 1/4
turn with hexagonal wrench to let a little refrigerant
fill in the system, and close the low pressure valve
after 5 seconds and quickly remove the pressure hose.
10.Check all indoor and outdoor joints for leakage
with soapy water or leak detector.
11.Fully open the low pressure valve and high pressure
valve of the outdoor unit with hexagonal wrench.
12.Replace the protective caps of the service port, low
pressure valve and high pressure valve of the outdoor unit.
13.Replace the valve cover.
5.Turn on the vacuum pump to vacuumize the system.
6.T
Manifold gauge
compound gauge
Low pressure valve
Valve protective caps
Pressure hose
Pressure gauge
High pressure valve
Charge hose
High pressure valve
Low pressure valve
Vacuum pump
Service port
INSTALLATION MANUAL---Installation of the outdoor unit
30
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