Mitsubishi Electric Mr.Slim SUZ-M-VA-ER Series Installation Manual page 9

5. Refrigerant piping work
5.3. Purging procedures leak test
PURGING PROCEDURES
Connect the refrigerant pipes (both the liquid and gas pipes) between the indoor
and the outdoor units.
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.
Run the vacuum pump. (Vacuumize for more than 15 minutes.)
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).
*Close
*Open Stop valve
Hexagonal wrench
Service port
*4 to 5 turns
20
Compound pressure
-0.101 MPa
gauge (for R32)
Stop valve
(-760 mmHg)
Pressure gauge
(for R32)
Gauge manifold
valve (for R32)
Handle High
Handle
Low
Charge hose
Stop
(for R32)
valve
Vacuum (or the vacuum
pump
pump with the
Window
function to
Adapter for
prevent the back
Charge hose
preventing the
flow)
(for R32)
back flow
Remove the gage manifold valve quickly from the service port of the stop valve.
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.
Tighten the cap to the service port to obtain the initial status.
Retighten the cap.
Leak test
Pipe length exceeding 7 m
Charge the prescribed
amount of gas.