Leak Test; Vacuum Operation - Carrier 38GJ Series Owner Manual And Install Manual

NO.
Name Coping plate
NO.
Name Liquid side stop valve
NO. A
Name Front connection
1) Unscrew the coping plate, front side plate, right connection board and front connection board.
2) The refrigerant pipes can be installed in four directions, choose the proper direction.
3) Knock the holes in the plate of the chosen direction with the drill and hammer.
4) Connect the pipes to the stop valves.
Bend the pipes to fit through the knockout holes.
5)
6) Cover the through-holes with sealing materials to prevent water, dust or small animals
from entering the outdoor unit.

6.7 Leak Test

Ensure the outdoor unit stop valves are closed during the operation.
1)
The leak test should be done by pressurizing nitrogen gas.
2)
3) Turn on the Hi-knob and Lo-knob. The leak test should be done simultaneously at both the gas
and liquid stop valves.
Open the pressure reducing valve, pressurize the connection pipes to 1.0 MPa (145 psi) slowly,
4)
wait fifteen minutes, and ensure the pressure does not drop.
Rise the pressure to 4.0 MPa (580.1 psi) slowly, wait 24 hours, and ensure the pressure does not
5)
drop.
6) If the pressure does not decrease, the pipes have passed the test. Otherwise, look for
gas leaks .
1: Outdoor unit
2: Liquid side stop valve
3: Gas side stop valve
4: Pressure-vacuum gauge
5: Hi-knob
6: Lo-knob
7: Pressure reducing valve
8: Nitrogen

6.8 Vacuum Operation

1) Make sure the liquid and gas stop valve of the outdoor unit are closed fully during the
operation.
As shown in the following figure, expel the gas from the refrigerant pipes with the vacuum pump.
2)
3) Open the pump and turn on the knobs to evacuate the gas in the liquid and gas pipes.
vacuuming should be done simultaneously at both the gas and liquid stop valves.
When the pressure of the system is less than 0.1Mpa (-14.5 psi), keep the system
4)
at this level for more than one hour.
Rear side plate
Right connection board
B
Bottom connection
Fig. 15
Fig. 16
15
Front side plate Gas side stop valve
Front connection board
C
Side connection Rear connection
D
The