Pump Down Procedure - Fujitsu AUYG36LRLA Service Manual

OUTDOOR UNIT
PUMP DOWN (Refrigerant collecting operation)
Perform the following procedures to collect the
refrigerant when moving the indoor unit or outdoor unit
Never touch electrical components such as the terminal
blocks or reactor except the switch on the display board.
It may cause a serious accident such as electric shock.
Perform the pump down operation before disconnecting
any refrigerant pipe or electric cable.
Collect refrigerant from the service port or the 3-way
valve if pump down cannot be performed.
In case of a group control system installation, do not turn
the power off pump down is completed in all outdoor
units.
(Group control system installation described in "SPECIAL
INSTALLATION METHODS" in the installation manual of
the indoor unit.)
Operate [PUMP DOWN] switch on the display board in
the manner described below.
LED display part
Reactors
Service hose
Charging port
Charging port cap
3-way valve
1. Preparation for pump down
Confirm that the power is off,
and then open the service panel.
2012.04.26
WARNING
CAUTION
PUMP DOWN
switch
Terminal blocks
Service port
Service port cap
Service hose

2. Pump down procedure

(1) Check the 3-way valves (both at the liquid side and gas
side) are opened.
(2) Turn the power on.
TEST
POWER
RUN
ERROR
MODE
(L1)
(3) Press [PUMP DOWN] switch for 3 seconds or more after
3 minutes after power on.
TEST
POWER
RUN
ERROR
MODE
(L1)
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 below about 3
minutes after the compressor starts. Fully close the
3-way valve on the liquid pipe side at this stage.
TEST
POWER
RUN
ERROR
MODE
(L1)
If the valve on the liquid pipe side is not closed, the
pump down cannot be performed.
(5) When LED display changes as shown in the below
figure, close the 3-way valve on the gas pipe side tightly.
TEST
POWER
RUN
ERROR
MODE
(L1)
If the valve on the gas pipe side is not closed, refrigerant
may flow into the piping after the compressor stops
Step (4)
Closing direction
Hexagon wrench
Liquid pipe
(6) LED display changes after 1 minute as shown in the
figure below
TEST
POWER
RUN
ERROR
MODE
(L1)
Fans and compressor stop automatically.
If the pump down is successfully completed (the above
LED display is shown), the outdoor unit remains stopped
until the power is turned off.
(7) Turn the power off.
TEST
POWER
RUN
ERROR
MODE
(L1)
PUMP DOWN is completed.
(Note)
To stop pump down, press the [PUMP DOWN] switch
again.
To start the pump down again after the compressor is
automatically stopped due to an error, turn the power
off and open the 3-way valves. Wait 3 minutes, turn the
power on and start the pump down again.
When starting the operation after completion of the pump
down, turn the power off, and then open the 3-way valves.
Wait 3 minutes, turn the power on and perform a test run
in the "COOL" operation mode.
20
PUMP
LOW NOISE PEAK CUT
DOWN
(L2) (L3) (L4) (L5) (L6) (L7)
PUMP
LOW NOISE PEAK CUT
DOWN
(L2) (L3) (L4) (L5) (L6) (L7)
PUMP
LOW NOISE PEAK CUT
DOWN
(L2) (L3) (L4) (L5) (L6) (L7)
PUMP
LOW NOISE PEAK CUT
DOWN
(L2) (L3) (L4) (L5) (L6) (L7)
Step (5)
Closing direction
Gas pipe
PUMP
LOW NOISE PEAK CUT
DOWN
(L2) (L3) (L4) (L5) (L6) (L7)
PUMP
LOW NOISE PEAK CUT
DOWN
(L2) (L3) (L4) (L5) (L6) (L7)