Panasonic CU-4E24RBU Service Manual

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5214.2.3 Wiring Error Check The unit capable to correct the wiring error automatically by following procedures.o Confirm the valve on the liquid side and gas side is open.o Press WIRING CHECK button (SW3) on the Display PCB inside the outdoor unit for more than 10 seconds tostart wiring check operation.o Wiring check process will complete in approximately 20 - 25 minutes. However, wiring check operation willnot start within 3 minutes after compressor is stopped. When outdoor air temperature is less than 41°F (5°C)or unit has abnormality, wiring check will not start. (See NOTE 2) The LED 2 to LED 6 in Display PCB inside the outdoor unit indicate the possibility of the correction as shown inthe table below:LED 2 3 4 5 6 MessageRoom A B C D -StatusAll flashing Automatic correction impossibleLED2, 4, 6 and LED 3, 5alternatively flashing Wiring check in progressFlashing one afteranother Automatic correction completedOther than above Unit has abnormality (NOTE 4) If automatic correct is impossible, check theindoor unit wiring and piping manually.NOTE:1. For two rooms, LED 4,5 and 6 are not illuminated, for three rooms, LED 5 and 6 are not illuminated and forfour rooms, LED 6 is not illuminated after wiring operation complete.2. If the outdoor air temperature is less than 41°F (5°C) or unit has abnormality, wiring operation will not start.3. After wiring check operation is complete, LED indication will illuminated until normal operation starts.4. Follow the product diagnosis procedure. (Check the diagnostic label at the cabinet side plate.)5. When LED 1 only illuminate, indicates that outdoor unit is operating normally.14.2.4 Power Save Mode Power Save Mode can be enabled by pushing POWER SAVE switch (SW4) to ON before power supply ON. When Power Save Mode is ON, the unit can be operate at lower running current where the breaker capacity notachieve the requirement.14.2.5 Mode priority function Mode priority function can be enabled by pushing MODE PRIORITY switch (SW5) to ON before power supplyON. When Mode Priority Function is ON, the mode priority is given to higher capacity indoor units.14.2.6 Cooling only function The unit capable to limit the operation mode to Cooling Mode only (Heating mode disabled) by cutting JP1(COOL ONLY) before power supply ON. This function prevent wrong operation during the unit installed in server room. This function could be disabled again by short the JP1 (COOL ONLY) before power supply ON.Wiring error checkLED lighting sequence after a wiring correction.Order of LED flashing: 3--> 2--> 4--> 5Automatic wiring correction exampleTerminal blockFrom RoomB to the“living room”From RoomA to the “bedroom”From RoomC to the“kitchen”From RoomD to the“childrenroom 1”