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9.1. Preparation for pump down
• Confirm that the power is off, and then open the service panel.
9.2. Pump down procedure
(1) Check the 3-way valves (both the liquid side and gas side) are opened.
(2) Turn the power on.
PUMP
POWER/
ERROR
DOWN
MODE
(L1)
●
○
○
○
●
Sign "
": Lights off, "
": Lights on
(3) Press [PUMP DOWN] button (S130) for 3 seconds or more after 3 minutes after
power on.
PUMP
POWER/
ERROR
DOWN
MODE
(L1)
●
○
●
○
●
Sign "
": Lights off, "
": Lights on
LED display lights on as shown in the above table, and the fans and the
compressor start operating.
• If the [PUMP DOWN] button (S130) 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.
PUMP
POWER/
ERROR
DOWN
MODE
(L1)
●
○
●
○
●
Sign "
": Lights off, "
": Lights on
• 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 following table, close the 3-way valve
on the gas pipe side tightly.
PUMP
POWER/
ERROR
DOWN
MODE
(L1)
●
○
●
○
●
Sign "
": Lights off, "
": Lights on
• 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 table.
PUMP
POWER/
ERROR
DOWN
MODE
(L1)
●
○
●
○
●
Sign "
": Lights off, "
": Lights on
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.
En-16
LOW NOISE
PEAK CUT
(L2)
(L3)
(L4)
(L5)
○
○
○
○
LOW NOISE
PEAK CUT
(L2)
(L3)
(L4)
(L5)
○
○
●
●
LOW NOISE
PEAK CUT
(L2)
(L3)
(L4)
(L5)
○
○
○
●
LOW NOISE
PEAK CUT
(L2)
(L3)
(L4)
(L5)
○
○
○
○
Step (5)
Closing direction
Gas pipe
LOW NOISE
PEAK CUT
(L2)
(L3)
(L4)
(L5)
○
○
○
○
(7) Turn the power off.
POWER/
ERROR
MODE
○
○
○
Sign "
": Lights off
Pump down is completed.
NOTES:
• To stop pump down, press the [PUMP DOWN] button (S130) 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
(L6)
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 Cooling operation mode.
• If an error occurs, recover the refrigerant from service port.
10. ERROR CODES
You can determine the operating status by the lighting on and blinking of the LED display.
(L6)
●
LED display part
Button part
(L6)
●
10.1. Error display mode
Display when an error occurs.
(L6)
●
POWER/
ERROR
MODE
●
Blink
(Hi speed)
○
Sign "
": Lights off, "
(1) Check that the "ERROR" LED blinks, then press the [ENTER] button (S132) once.
(L6)
○
PUMP
LOW NOISE
DOWN
(L1)
(L2)
(L3)
(L4)
○
○
○
○
PUMP
LOW NOISE
DOWN
(L1)
(L2)
(L3)
(L4)
○
○
○
○
●
": Lights on
PEAK CUT
(L5)
(L6)
○
○
PEAK CUT
(L5)
(L6)
○
○