Panasonic U-8MF2E8 Service Manual

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Contents

Panasonic U-8MF2E8 Service Manual Manual pdf 68 page image

3WAY SYSTEMOutdoor Unit Repair Procedures2 - 824. Recovering Refrigerant4-2. Refrigerant Recovery Procedures (Indoor Unit)The flowchart below shows the refrigerant recovery procedures you must follow when replacing or repairing theindoor unit due to trouble in the refrigerant circuit.START4-2-1. Cooling operation (for all units)Ball valve is provided in the indoor unit Turn off all equipment in systemReplace or repair faulty unitCheck for leakage in repaired unitEvacuate air from repaired unitReady for operationENDCharge refrigerant in repaired unit(Amount of charge should equal thatrecovered by refrigerant recovery unit)Charge refrigerant in repaired unit ((Amount of charge should equal thatrecovered by refrigerant recovery unit)4-2-3. Refrigerant recoveryprocedures (2)Turn off all equipment in systemOther indoor units can operate normallyReplace or repair faulty unitCheck for leakage in repaired unit (Evacuate air from repaired unit (Open ball valveReady for normal operationEND ENDReady for normal operationOpen the ball valveEvacuate air in repaired unit (Check for leakage in repaired unit (Replace or repair faulty unitCharge refrigerant in repaired unit ((Amount of charge should equal thatrecovered by refrigerant recovery unit)Change controllable number of indoorunits (including changes in groupcontrol and integrated-control settings)4-2-2. Refrigerant recoveryprocedures (1)When replacing or repairing a faultyunit, let other normal indoor units run(excluding indoor unit where refrigerantis recovered)Modify power to permit turning offpower to refrigerant-recoveredindoor units independentlyPower can independently be turned offfor indoor unit where refrigerant isrecoveredChange controllable number of indoorunits (including changes in groupcontrol and integrated-control settings)NONONOYESFig. 2YESYESService work performed on indoor units is done simultaneously using the service ports at the liquid (narrow tube) side and thegas (wide tube) side ball valves. Refer to each section in the “Installation Instructions” on refrigerant charging, leak checking, andevacuation procedures.4-2-1. Cooling operation (for all units)(1) If the remote controller (CZ-RTC2) is used for maintenance of the outdoor unit1 Connect the outdoor unit maintenance remote controller to the RC connector (CN73) (3P) (BLU) on any oneof the outdoor unit control PCBs. Then start a test run of all units. (Press and hold the (CHECK) button for4 seconds or longer.)2 Press the (MODE) button and change to cooling operation and ensure that the cooling is per-formed.Refer to the test run service manual for the detail of the outdoor maintenance remote controller operation. Itmay be possible to determine whether operation is cooling or heating by touching the gas tubing.Cooling : low temperature (20͠ or lower)Heating : high temperature (60͠ or higher)The gas tubing becomes hot (60͠ or higher) in heating mode. Be careful so asnot to be burnt when touching the tubing.CAUTION