Mitsubishi Electric SUZ-SWMVA Serie Manuel D'installation page 15

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).
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.".
Notes:
The position of the switches and the LCD screens shown above are only for reference.
Please refer to the service manual for the details.
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.
en
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