Mitsubishi Electric SUZ-SWM30VA TH Series Service Manual page 19

Fully close the stop valve on the gas pipe side of the outdoor unit when the pres-
sure gauge shows 0.05 to 0 MPa [Gauge] (approx. 0.5 to 0 kgf/cm 2 ) and quickly
stop the outdoor unit.
• Push the "ON/OFF" button on the remote controller to stop the outdoor unit.
* Note that when the extension piping is very long with a large refrigerant
amount, it may not be possible to perform a pump down operation. In this case,
use refrigerant recovery equipment to collect all of the refrigerant in the system.
Set back the main controller setting changed at the procedure
Push the "ON/OFF" button for about 3 seconds on the main controller of the in-
door unit to stop the unit.
Set back the main controller settings changed at any other procedure except
* How to set back "Running information": Set Reference address to 350.
Turn OFF all the supply circuit and set back the DIP switch settings on the indoor
circuit board as it were.
Remove the gauge manifold valve, and then disconnect the refrigerant pipes.
OCH796A
WARNING:
When the refrigeration circuit has a leak, DO NOT execute pump down
with the compressor.
When pumping down the refrigerant, stop the compressor before dis-
connecting the refrigerant pipes.
• If the refrigerant pipes are disconnected while the compressor is op-
above.
erating and the stop valve (ball valve) is open, the pressure in the
refrigeration cycle could become extremely high if air is drawn in,
causing the pipes to burst, personal injury, etc.
.
CAUTION:
Do NOT use this COOLING mode when connecting to an indoor unit
that does not allow COOLING mode for any purpose other than pump-
ing down.
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