Pumping Down - Mitsubishi Electric SUZ-SWM VA-Serie Installationshandbuch

9. Pumping down

When relocating or disposing of the outdoor unit, pump down the system following
the procedure below so that no refrigerant is released into the atmosphere.
1 Turn OFF all the supply circuit (including Indoor unit, Heater, Outdoor unit etc.)
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 Change the settings on the indoor unit.
• Set DIP switch SW1-3 to OFF, SW2-1 to OFF, SW2-4 to ON and SW6-3 to
OFF on the indoor control board.
• Disconnect the signal inputs IN1 (room thermostat 1 input), IN4 (Demand con-
trol input) and IN5 (Outdoor thermostat input).
en
de
IN1 IN4 IN5
5 Turn ON all the supply circuit.
6 From the main menu on the main controller of the indoor unit, select "Heating/
cooling mode" → "Cooling flow temp.".
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7 From the main menu, select "Service" and change the setting as below. You will
be prompted to enter a password. THE FACTORY DEFAULT PASSWORD is
"0000".
• Select "Operation settings" → "Freeze stat function", and then set the minimum
outdoor ambient temperature to *(asterisk).
• Select "Running information", and then set Reference address to 351.
8 Perform the refrigerant collecting operation.
• Push "ON/OFF" button on the main controller.
• From the option menu, set "Cooling ON".
• Set the target flow temperature to 5 °C. If the system is controlled by a room
temperature thermostat, set the target room temperature to 10 °C.
Refrigerant collecting operation starts after 60 seconds.
• For details or for other information about the main controller settings, refer to
the installation manual or operation manual for indoor unit.
Continued on next page.