14-4.Pump Down - Fujitsu AUU7RLF Design & Technical Manual

14-4. Pump down
WARNING
!
During the pump down operation, make sure that compressor is off before you remove the re-
frigerant 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*1
*Be sure the power supply is disconnected on the breaker is turned off when changing the DIP
switch.
3. To start operation, press the [PUMP DOWN] switch*2 for 3 seconds or press after the power has
been on for 3 min.
During pump down, the LED (POWER/MODE) will fl ash 3 times consecutively.
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 the value between 7.3 psi and 0 psi (0.05 Mpa to 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.
SET1
ON
1 2 3 4
*1: DIP switch
(SET1-2)
TEST RUN
*2: Push switch (SW1)
S W 1
PUMP DOWN
POWER ERROR
MONITOR
MODE
A B C
(3-blink)
POWER ERROR
MONITOR
MODE
A B C
(3-blink)
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D E F
D E F