Mitsubishi Electric MXZ-2C20NA2-U1, Service Manual

Page: 46 / 114

46
When relocating or disposing of the air conditioner, pump down the system following the procedure below so that no refriger-
ant is released into the atmosphere.
1) Turn off the breaker.
2) Connect the gauge manifold valve to the service port of the stop valve on the gas pipe side of the outdoor unit.
3) Fully close the stop valve on the liquid pipe side of the outdoor unit.
4) Turn on the breaker.
5) Start the emergency COOL operation on all the indoor units.
6) When the pressure gauge shows 0.1 to 0 psi [Gauge] (0.05 to 0 MPa), fully close the stop valve on the gas pipe side
of the outdoor unit and stop the operation. (Refer to the indoor unit installation manual about the method for stopping
the operation.)
* If too much refrigerant has been added to the air conditioner system, the pressure may not drop to 0.1 to 0 psi [Gauge]
(0.05 to 0 MPa), or the protection function may operate due to the pressure increase in the high pressure refrigerant cir-
cuit. If this occurs, use a refrigerant collecting device to collect all of the refrigerant in the system, and then recharge the
system with the correct amount of refrigerant after the indoor and outdoor units have been relocated.
7) Turn off the breaker. Remove the pressure gauge and the refrigerant piping.
When pumping down the refrigerant, stop the compressor before disconnecting the refrigerant pipes.
The compressor may burst and cause injury if any foreign substance, such as air, enters the pipes.
WARNING
PUMPING DOWN
OBH702G