Panasonic CU-4E24RBU Service Manual

Also see for CU-3E19RBU: Operating instructions Service manual Service manual Service manual Installation manual

5114.2 CU-4E24RBU14.2.1 Pump down operation (SW1) Operate the pump down process according to the following procedure.o Confirm the valve on the liquid side and gas side are open.o Press PUMP DOWN button (SW1) on the Display PCB inside the outdoor unit for more than 5 seconds.Pump down (cooling) operation is performed for 15 minutes.o Set the liquid side 3 way valve to close position and wait until the pressure gauge indicates 0.01MPa(1.45 PSI).o Immediate set the gas side valve to close position and then press the PUMP DOWN button (SW1) to stop thepump down operation.NOTE: Pump down operation will stop automatically after 15 minutes if PUMP DOWN switch (SW1) is not pressedagain. Pump down operation is not started within 3 minutes after compressor is stopped.LED 2 3 4 5 MessageStatusO O O O Pump down operation in progressO O O 3 minutes before operation endO O 2 minutes before operation endO 1 minute before operation endPump down operation endO: Flashing14.2.2 Test Run Operation Test operation can be carried out using OPERATION TEST button (SW2) on the Display PCB inside the outdoorunit. For Cooling test, press the OPERATION TEST 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 OPERATION TEST button (SW2) for more than 10 seconds, LED 1 and LED 3 willilluminate when shift into heating test operation. Press the OPERATION TEST button (SW2) again to cancel test operation.OFF ONOFF ONFig. 1SW1 (PUMP DOWN)SW4 (POWER SAVE)SW5 (MODE PRIORITY)SW2 (OPERATION TEST)JP1 (COOLONLY)SW3 (WIRING CHECK)Unit DUnit CUnit A Unit BCloseHexagonalwrenchLiquid shut-off valveGas shut-off valveValve lid