Fujitsu ABHG18KRTA, Service Manual

Page: 470 / 471

3-4. Pump down
WARNING
During the pump down operation, make sure that compressor is off before you remove the refriger-
ant pipe. Do not remove the connection pipe while the compressor is in operation with valve open.
This may cause abnormal pressure in the refrigeration cycle that leads to breakage and even injury.
¢
Pump down operation
When moving or discarding the air conditioner, in order to consider the environment and avoid the
discharge of refrigerant to the atmosphere, pump down according to the following procedure.
1. Connect the pressure gauge to the charging port.
2. Change the DIP switch on the board (SET1-2) to ON.
NOTE: Disconnect the power supply firmly on the breaker before changing the DIP switch
settings.
(SET1-2)
DIP switch
SET 1
ON
3. To start operation, push the PUMP DOWN switch (SW1) for 3 seconds or push the switch after
the power has been on for 3 minutes.
TEST RUN /
PUMP DOWN
Push switch (SW1)
During pump down, the LED (POWER/MODE) blinks 3 times consecutively.
(3-blink)
MONITOR
POWER
ERROR
/MODE
(GRN) (RED)
A B C D E F
NOTE: If the PUMP DOWN switch (SW1) is pushed while the compressor is in operation,
the compressor stops and the operation restart after about 3 minutes.
4. Close the liquid pipe valve.
5. When the value between 7.3 psi and 0 psi (0.05 MPa to 0 MPa) is shown, close the gas pipe
valve.
6. Stop the pump down operation by pushing the PUMP DOWN switch (SW1) for 3 seconds. The
LED light as follows.
MONITOR
POWER
ERROR
/MODE
(GRN) (RED)
A B C D E F
(3-blink)
3-4. Pump down
- (05-66) -
3. Check and test
FIELD WORKING FIELD WORKING