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2-15
2-12. Caution for Pump Down
Pump down means refrigerant gas in the system is returned to the outdoor unit. Pump down is used
when the unit is to be moved, or before servicing the refrigerant circuit.
How to perform Pump-Down (Refrigerant recovery) properly
(1) Stop operation of the unit (cooling, heating etc.).
(2) Connect the pressure gauge to the service port of the gas tubing valve.
(3) Short-circuit the “PUMPDOWN” pin on an outdoor unit control PCB (CR) for more than 1 second to release.
Pump-Down begins and the unit starts operating.
During Pump-Down, LED1 blinks and LED2 is lit on an outdoor unit control PCB (CR).
“CHK” blinks on the remote controller.
(4) Fully close the liquid tubing valve 2-3 minutes later.
The Pump-Down will begin.
(5) When the pressure gauge drops to 0.1-0.2MPa, close the gas tubing valve tightly and short-circuit the “PUMPDOWN” pin for more
than 1 second to release. That is the end of Pump-Down.
When running for more than 10 minutes, it stops even if the Pump-Down is not completed. Check the blocked state of the liquid
tubing valve.
lt also stops when the “PUMPDOWN” pin is short-circuited during the operation.
* For compressor protection, do not operate to the point where the unit wiring side reaches negative pressure.
Note : In the case that inter-unit wiring is 30m or longer, you cannot pump-down.
(lt may trigger the operation of the overload protection device.)
In this case, perform pump-down with pump-down device.
SM830276-00_欧州向け R32シングル TD＆SM.indb 15 19/02/28 13:23:00
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