Servicing Mode - Panasonic CU-4Z80TBE Service Manual

15. Servicing Mode

15.1.1 Pump down operation (SW1)

Operate the pump down process according to the following procedure.
Confirm the valve on the liquid side and gas side are open.
o
Press PUMP DOWN button (SW1) on the Service PCB inside the outdoor unit for more than 5 seconds.
o
Pump down (cooling) operation is performed for 15 minutes.
Set the liquid side 3 way valve to close position and wait until the pressure gauge indicates 0.01MPa
o
2
(0.1kg/cm G).
Immediate set the gas side valve to close position and then press the PUMP DOWN button (SW1) to stop the
o
pump down operation.
NOTE: Pump down operation will stop automatically after 15 minutes if PUMP DOWN switch (SW1) is not pressed
again. Pump down operation is not started within 3 minutes after compressor is stopped.
LED 2 3 4
: Flashing
15.1.2 Test Run Operation

Test operation can be carried out using TEST OPERATION button (SW2) on the Service PCB inside the outdoor
unit.

For Cooling test, press the TEST OPERATION button (SW2) for 5 seconds or more but less than 10 seconds,
LED1 and LED 2 will illuminate when shift into cooling test operation.

For Heating test, press the TEST OPERATION button (SW2) for more than 10 seconds, LED 1 and LED 3 will
illuminate when shift into heating test operation.

Press the TEST OPERATION button (SW2) again to cancel test operation.
5 Message
Pump down operation in progress
3 minutes before operation end
2 minutes before operation end
1 minute before operation end
Pump down operation end
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