Fujitsu AB12

INDOOR UNIT
When the indoor unit receives the “Pump down signal” from the outdoor unit, the indoor unit is performed
following operation.
(3) Pump down is completed in following cases.
When pump down DIP-SW is turned ON OFF
When the discharge pressure sensor detects more than 3Mpa.
Starts receiving
pump down signal
RB unit
: 1900 pulse
Electric expansion valve
Discharge valve : ON
Suction valve : ON
Bypass valve : ON
Indoor fan motor : Hi
No
Yes
Finish receiving
defrost signal
Indoor fan motor : OFF
Operation stops
RB unit
Discharge valve : OFF
Suction valve : ON
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