Pump Down - Rheem RHMV4821SNACJA Manual De Instalación

9. PUMP DOWN

During the pump down operation, make sure that compressor is off before you re-
move 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.
■ 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
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 fl 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.
En-14
9374995677-02_IM.indb 14 9374995677-02_IM.indb 14
WARNING
*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
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
MONITOR
MODE
A B C
Blink
Blink
(3 times)
(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.
CAUTION
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.
D E F
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