Pumping Down - Mitsubishi Electric MXZ-2C20NAHZ2 Notice D'installation

5. PUMPING DOWN

When relocating or disposing of the air conditioner, pump down the system following the procedure below so that no refrigerant is released into the atmosphere.
1) Turn off the brea er.
2) Connect the gauge manifold al e to the ser ice port of the stop al e on the gas pipe side of the outdoor unit.
3) Fully close the stop al e on the liquid pipe side of the outdoor unit.
4) Turn on the brea er.
5) Start the emergency COOL operation on all the indoor units.
6) When the pressure gauge shows 0.1 to 0 psi [ auge] (0.05 to 0 MPa), fully close the stop al e 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 [ auge] (0.05 to 0 MPa), or the protection function
may operate due to the pressure increase in the high-pressure refrigerant circuit. If this occurs, use a refrigerant collecting de ice 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 ha e been relocated.
7) Turn off the brea er. Remo e 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.
En-7
WARNING