Pump Down - Fujitsu AU A36LCLU Series Service Instruction

1-16. PUMP DOWN

Operate [PUMP DOWN] switch on the display board.
< PUMP DOWN Procedure >
(1) Confirm that power is off, and open the service panel.
(2) Turn the power on.
TEST PUMP
POWER
RUN DOWN
ERROR
MODE
(L1) (L2) (L3)
(3) Press [PUMP DOWN] switch for 3 seconds or more after 3 minutes after power on.
TEST PUMP
POWER
RUN DOWN
ERROR
MODE
(L1) (L2) (L3)
LED display lights on as shown in the above figure, and the fans and the compressor start operating.
If the [PUMP DOWN] switch is pressed while the compressor is operating, the compressor will stop then
start again in about 3 minutes.
(4) LED display will change as shown as below about 3 minutes after the compressor starts.
Fully close the 3-way valve on the liquid pipe side at this stage.
TEST PUMP
POWER
RUN DOWN
ERROR
MODE
(L1) (L2) (L3)
(5) When LED display changes as shown in the below figure, close the 3-way valve on the gas pipe side tightly.
TEST PUMP
POWER
RUN DOWN
ERROR
MODE
(L1) (L2) (L3)
Step (4)
Closing direction
Hexagon wrench
Liquid pipe
(6) LED display changes after 1 minute as shown in the figure below.
TEST PUMP
POWER
RUN DOWN
ERROR
MODE
(L1) (L2) (L3)
Fans and compressor stop automatically.
(7) Turn the power off.
TEST PUMP
POWER
RUN DOWN
ERROR
MODE
(L1) (L2) (L3)
PUMP DOWN is completed.
: Light OFF : Light ON
LOW NOISE PEAK CUT
(L4) (L5) (L6) (L7)
LOW NOISE PEAK CUT
(L4) (L5) (L6) (L7)
LOW NOISE PEAK CUT
(L4) (L5) (L6) (L7)
LOW NOISE PEAK CUT
(L4) (L5) (L6) (L7)
Step (5)
Closing direction
Gas pipe
LOW NOISE PEAK CUT
(L4) (L5) (L6) (L7)
LOW NOISE PEAK CUT
(L4) (L5) (L6) (L7 )
01-22