Evacuation Procedures - Mitsubishi Electric MXZ-18NV Service Manual

8.4 EVACUATION PROCEDURES

MXZ-18NV - MXZ-18NV -
E1
CAUTION :
If you run this unit with air in its refrigerant pipe before air purge, the compressor will decline in cooling
capacity, which may result in trouble.
. Connect the refrigerant pipes (both the liquid and gas pipes) between the indoor and the uotdoor 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 atate fresh out of the factory (totally closed with cap on).]
. Connect the gauge manifold valve and the vacuum pump to the service port of the stop valve on the side
of the outdoor unit gas pipe.
. Run the vacuum pump.
. Check the vacuum with the gauge manifold valve, then close the gauge manifold valve, and stop the
vacuum pump.
. Leave it as is for one or two minutes.Make sure the pointer of the gauge manifold valve remains in the
same position.
. Remove the cape from the stop valves of the outdoor unit, liquid pipe, and gas pipe. Pull the handle
towards you with a finger. Turn it one fourth turn counterclockwise, to obtain the full-open position.
. Remove the cape manifold valve quickly from the service port of the stop valve.
. Tishten the cap to the service port to obtain the initial status.
. Thrust the handle of the stop valve into the unit, then retighten the cap.
.......
Leak test With a gas detector or soap water, check the flared nut connections for any refrigerant leak.
In case of a refrigerant leak
Retighten the flared nut connections.
If the leak does not stop even after retightening, repair the leaking point, collect all from inside the unit
through the service port, apply a vacuum to it, then charge a specified amount of gas with a gas cylinder.
18
E2
Service port
Gauge manifold valve
Connect pipes
Vacuum pump