Panasonic R410A Service Manual

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Panasonic R410A Service Manual Manual pdf 28 page image

Mini VRF SYSTEMOutdoor Unit Repair Procedures2 - 6123546The following equipment and tools are required:Jumper wire with clips, adjustable wrench, set of manifold gauge valves specially designed for refrigerant R410Aonly, vacuum pump, refrigerant recovery unit, pre-purged refrigerant cylinder for recovery (air already evacuated),and hex wrench (4 mm for liquid tube and 5 mm for gas tube).3-1. Refrigerant Recovery Procedures (From Outdoor Unit)(1) Turn off the power of the outdoor unit beforehand (at power mains).(2) Fully close each service valve on the gas line and liquid line of the outdoor unit.(3) Connect the outdoor unit’s high-pressure and low-pressure outlet ports with the Hi and Lo sides of themanifold gauge valves using hoses. (See Fig. 2-2)The remaining refrigerant in the outdoor unit may create internal pressure.Before connecting hoses, be sure to confirm that each of the manifold gaugevalves is tightly closed. Note that the connection ports employ Schrader-type,press-to-release valves.For detailed procedures such as connecting the refrigerant recovery unitwith the recovery cylinder and methods used for recovery, follow the specificinstructions that came with the refrigerant recovery unit.By short-circuiting the AP pins, each electronic expansion valve in theoutdoor unit is forcibly opened as soon as power comes on, which releasesall remaining refrigerant into the recovery cylinder. Since neglecting thisprocedure may leave some refrigerant in the system, it is important that youcarry out this step.To determine the completion of refrigerant recovery, follow the instructionsthat came with the refrigerant recovery unit.CAUTIONCAUTIONCAUTIONCAUTIONFig. 2-2Refrigerant recovery cylinderRefrigerantrecovery unitManifoldgaugeLow-pressure outlet port(For ø5/16" connector)Lo Hi(4) Connect the manifold gauge valves, refrigerant recovery unit, and recovery cylinder using hoses.To avoid the entry of air into the refrigerant tubing, carry out this connection work carefully.(5) Locate the AP pins on the control PCB in the outdoor unit and short them using the clips of the jumper wire.Then restore electrical power to the outdoor unit.(6) Carry out refrigerant recovery.3. Recovering Refrigerant