Pump Down - Fujitsu AMUG24LMAS Service Manual

18. PUMP DOWN OPERATION
AOUG36LMAS1
AOUG48LMAS1
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
1 2 3 4
*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
Blink
(3 times)
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
MODE
A B
Blink
(3 times)
(7) Disconnect the power supply or turn off the breaker.
NOTES:
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
MODE
A B
Blink
Blink
(3 times)
(High-speed)
*Be sure the power supply is
disconnected on the breaker
is turned off when changing
the DIP switch.
*2: Push switch (SW1)
MONITOR
B C D E F
MONITOR
C D E F
MONITOR
C D E F
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.
Make sure the refrigerant circuit for any leaks before starting the pump down opera-
tion.
Do not proceed with the pump down operation if there is no refrigerant left in the
circuit due to bent or broken piping.
During the pump down operation, be sure to turn off the compressor before removing
the refrigerant piping.
TEST RUN
Always connect the power supply 12 hours prior to the start of the operation in order
to protect the compressor.
(1) Indoor unit
1 Is the drain normal?
2 Is there any abnormal noise and vibration during operation?
(2) Outdoor unit
1 Is there any abnormal noise and vibration during operation?
2 Will noise, wind, or drain water from the unit disturb the neighbors?
3 Is there any gas leakage?
Do not operate the air conditioner in the test running state for a long time.
For the operation method of the test run for indoor unit and central remote controller,
refer to the operating manual and perform operation check.
TEST RUN method
Be sure to temporarily disconnect the power supply or turn off the breaker before
changing the DIP switch settings.
(1) Check the 3-way valves (both at the liquid side and gas side) are opened. Con rm
that the DIP switch SET1-2 is switched OFF.
(2) Set the operation mode to COOL or HEAT . If you wish to change the DIP switch
SET1-1 to HEAT , switch it after temporarily disconnecting the power supply or
turning off the breaker switching the power off.
SET1-1
SET1
ON
HEAT
COOL 1 2 3 4
In the rst test run, be sure to set the operation mode to COOL .
The operation mode cannot be switched between COOL and HEAT during the test
run. To switch the operation mode between COOL and HEAT , stop the test run,
switch the operation mode, and then start the test run again.
(3) Press TEST RUN switch for more than 3 seconds.
The POWER / MODE LED ashes once.
TEST RUN
S W 1
PUMP DOWN
(4) Con rm operating status.
(5) Press TEST RUN switch for more than 3 seconds.
POWER ERROR
MODE
A
POWER/MODE LED will turn on, and test run stops.
04-38
CAUTION
CAUTION
POWER ERROR
MONITOR
MODE
A B C
SW1
Blink
(1 time)
MONITOR
B C D E F
D E F