WARNING
Never touch electrical components such as the terminal blocks except the button on
the display board. It may cause a serious accident such as electric shock.
During the pump-down operation, make sure that the compressor is turned off before
you remove the refrigerant piping.
Do not remove the connection pipe while the compressor is in operation with 2-way or
3-way valve open. This may cause abnormal pressure in the refrigeration cycle that
leads to breakage and even injury.
CAUTION
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 [PUMPDOWN] button on the display board in the manner described
below.
OUTDOOR UNIT
PUMP DOWN
Procedure
Preparation for pump down
Confirm that the power is off,
and then open the service panel.
(1) Check the 3-way valves (both the liquid side and gas side) are opened.
(2) Turn the power on.
POWER
ERROR
PUMP
DOWN
LOW
NOISE
PEAK
CUT
MODE (L1) (L2) (L3) (L4) (L5) (L6)
Off Off Off Off
Off Off Off
Off Off OffOn
On On On On On
OffOff Off OffOn On On On
OffOff Off Off Off
OffOffOff Off Off Off Off Off
On On
OffOff Off Off Off OffOn On
On
(3) Press [PUMP DOWN] button for 3 seconds or more after 3 minutes after power on.
POWER
ERROR
PUMP
DOWN
LOW
NOISE
PEAK
CUT
MODE (L1) (L2) (L3) (L4) (L5) (L6)
LED display lights on as shown in the above figure and the fans and the
compressor start operating.
• If the [PUMP DOWN] button 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.
POWER
ERROR
PUMP
DOWN
LOW
NOISE
PEAK
CUT
MODE (L1) (L2) (L3) (L4) (L5) (L6)
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.
POWER
ERROR
PUMP
DOWN
LOW
NOISE
PEAK
CUT
MODE (L1) (L2) (L3) (L4) (L5) (L6)
• if the valve on the gas pipe side is not closed, refrigerant may flow into the piping
after the compressor stops.
Step (5)
Closing direction
Step (4)
Hexagon wrench
Liquid pipe
Gas pipe
Closing direction
(6) LED display changes after 1 minute as shown in the figure below.
POWER
ERROR
PUMP
DOWN
LOW
NOISE
PEAK
CUT
MODE (L1) (L2) (L3) (L4) (L5) (L6)
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.
POWER
ERROR
PUMP
DOWN
LOW
NOISE
PEAK
CUT
MODE (L1) (L2) (L3) (L4) (L5) (L6)
PUMP DOWN is completed.
(Note)
To stop pump down, press the [PUMP DOWN] button 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.
If an error occurs, recover the refrigerant from service port.•
2011.07.11
18
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