20
5.3. Purging procedures leak test
Connect the refrigerant pipes (both the liquid and gas pipes) between the indoor
and the outdoor units.
After refrigerant pipes are connected and evacuated, fully open all stop valves on
gas and liquid pipe sides.
Operating without fully opening lowers the performance and causes trouble.
Pipe length :
7 m maximum
No gas charge is needed.
Pipe length exceeding 7 m
Charge the prescribed
amount of gas.
Remove the service port cap of the stop valve on the side of the outdoor unit gas
pipe. (The stop valve will not work in its initial state fresh out of the factory (totally
closed with cap on).)
Connect the gage manifold valve and the vacuum pump to the service port of the
stop valve on the gas pipe side of the outdoor unit.
Check the vacuum with the gage manifold valve, then close the gage manifold
valve, and stop the vacuum pump.
Leave it as is for one or two minutes. Make sure the pointer of the gage mani-
fold valve remains in the same position. Confirm that the pressure gage show
-0.101 MPa (-760 mmHg).
PURGING PROCEDURES
Remove the gage manifold valve quickly from the service port of the stop valve.
Run the vacuum pump. (Vacuumize for more than 15 minutes.)
Tighten the cap to the service port to obtain the initial status.
Retighten the cap.
Leak test
*Open
*Close
Hexagonal wrench
Vacuum
pump
Handle
Low
Stop
valve
Window
Stop valve
Service port
*4 to 5 turns
Charge hose
(for R32)
Charge hose
(for R32)
Handle High
Gauge manifold
valve (for R32)
Pressure gauge
(for R32)
Compound pressure
gauge (for R32)
(or the vacuum
pump with the
function to
prevent the back
flow)
Adapter for
preventing the
back flow
Stop valve
-0.101 MPa
(-760 mmHg)
5. Refrigerant piping work
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