Pump Down Operation; Test Run ( Outdoor Unit ) - Fujitsu ASU18RLF Service Instructions Manual

29. 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, please 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*1
SET1
ON
*Be sure the power supply is
disconnected on the breaker
1 2 3 4 is turned off when changing
the DIP switch.
*1: DIP switch
(SET1-2)
(3) To start operation, press the [PUMP DOWN] switch*2 for 3 seconds or press after the
power has been on for 3 min.
TEST RUN
S W 1
PUMP DOWN
During pump down, the LED (POWER/MODE) will ash 3 times consecutively.
POWER ERROR
MODE
A B
(3-blink)
NOTE:
If the [PUMP DOWN] switch is pressed during compressor operation, the compressor
will stop, and the operation will start after about 3 min.
(4) Close the liquid pipe valve.
(5) When 7.3 psi ~ 0 psi (0.05 MPa ~ 0 MPa) is shown, close the gas pipe valve.
(6) Stop pump down by pressing the [PUMP DOWN] switch for 3 seconds.
The LED will light as follows.
POWER ERROR
MONITOR
MODE
A B C
(3-blink)
(7) Disconnect the power supply or turn off the breaker.
NOTE:
If the pump down is not stopped by pressing the switch as in step (6), it will stop
automatically after 15 min. and the LED will light as follows. If the pump down is
complete, disconnect the power supply or turn off the breaker. If not completed open
the liquid pipe valve, and then start again from step (3).
POWER ERROR
MONITOR
MODE
A B C
(3-blink)
blink
(High-speed)
In order to interrupt the pump down operation, press the [PUMP DOWN] switch
again. The LED will return to the original display before starting pump down.
(POWER/MODE LED: On)
The pump down may stop before completion due to error. To complete the pump
down, correct the error, open the liquid pipe valve and then start from step (1) again.
Otherwise, the refrigerant can be recovered from the service port.
*2: Push switch (SW1)
MONITOR
C D E F
D E F
D E F
01-34
WARNING
During the pump down operation, make sure that compressor is off before you remove
the refrigerant 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.