Leak Test, Vacuum Pumping, Refrigerant Adding - Gree GMV-36WL/B-T(U) User Manual

Ultra Heat GMV5 User Manual
compressor will shake abnormally and unit's operating life will be shortened.

4.5 Leak Test, Vacuum Pumping, Refrigerant Adding

4.5.1 Leak Test
(1) Please make sure that the stop valves of the outdoor unit are closed during the operation.
(2) The leak test should be made by pressurizing nitrogen gas.
(3) Turn on the Hi-knob and Lo-knob. The leak test should be done simultaneously at both the
gas and liquid stop valves.
(4) Open the pressure reducing valve, pressurize the connection pipes to 1.0 MPa (10 bar) slowly,
wait fifteen minutes, and make sure that the pressure will not drop.
(5) Rise the pressure to 4.0 MPa (40 bar) slowly, wait 24 hours, and make sure the pressure will
not drop.
(6) If the pressure does not decrease, the pipes have passed the test. Otherwise, look for where
the gas leaks from.
NO. 1
Name Outdoor unit Gas side stop valve
NO. 5
Name Hi-knob
Do not purge the air with refrigerants but use a vacuum pump to vacuum the installation! There is no extra
refrigerant in the outdoor unit for air purging!
4.5.2 Vacuum Pumping
(1)
Make sure that the stop valves of the outdoor unit are closed fully during the operation.
(2)
As shown in the following figure Fig.21, expel the gas from the refrigerant pipes by the
vacuum pump.
(3)
Open the pump and turn on the knobs to evacuate the gas in the liquid and gas pipes.
The vacuuming should be done simultaneously at both the gas and liquid stop valves.
Fig.20
2
Liquid side stop valve
6
Lo-knob Pressure reducing valve
16
3
Pressure-vacuum gauge
7
4
8
Nitrogen