14-4.Pump Down - Fujitsu ARXG22KMLB Design & Technical Manual

14-4. Pump down
WARNING
During the pump down operation, make sure that compressor is off before you remove the refriger-
ant piping. 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.
*Be sure the power supply is disconnected on the breaker is turned off when changing the DIP
switch.
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.
During pump down, the LED (POWER/MODE) blinks 3 times consecutively.
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.
14-4. Pump down
SET 1
ON
DIP switch
(SET1-2)
TEST RUN /
PUMP DOWN
Push switch (SW1)
POWER
MONITOR
ERROR
/MODE
( GRN ) ( RED )
A B C
(3-blink)
POWER
ERROR MONITOR
/MODE
( GRN ) ( RED )
A B C
(3-blink)
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D E F
D E F
14. Check and test