Servicing Mode; Cu-3E18Jbe & Cu-4E23Jbe - Panasonic CU-4E23JBE Service Manual

14 Servicing Mode

14.1. CU-3E18JBE & CU-4E23JBE
14.1.1. 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.
- Press PUMP DOWN button (SW1) on the Service PCB inside the outdoor unit for more than 5 seconds. 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 (0.1kg/cm
- Immediate set the gas side valve to close position and then press the PUMP DOWN button (SW1) to stop the 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
: Blinking
14.1.2. 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
40
2
G).