Panasonic Shows U-26PE1U6 Technical Data & Service Manual

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Panasonic Shows U-26PE1U6 Technical Data & Service Manual Manual pdf 128 page image

1-1221. Specifications1-14. LEAK TEST, EVACUATION ANDADDITIONAL REFRIGERANT CHARGEPerform an air-tightness test for this package A/C.Check that there is no leakage from any of theconnections. Air and moisture in the refrigerant systemmay have undesirable effects as indicated below.pressure in the system risesoperating current risescooling (or heating) effi ciency dropsmoisture in the refrigerant circuit may freeze and blockcapillary tubingwater may lead to corrosion of parts in the refrigerantsystemTherefore, the indoor unit and tubing between the indoorand outdoor unit must be leak tested and evacuated toremove any noncondensables and moisture from thesystem.Air Purging with a Vacuum Pump (for Test Run)PreparationCheck that each tube (both liquid and gas tubes) betweenthe indoor and outdoor units has been properly connectedand all wiring for the test run has been completed.Remove the valve caps from both the gas and liquidservice valves on the outdoor unit. Note that both liquidand gas tube service valves on the outdoor unit are keptclosed at this stage.The refrigerant charge at the time of shipment is onlyguaranteed sufficient for a tubing length of up to 100 ft.The tubing may exceed this length, up to the maximumpermitted length; however, an additional charge isnecessary for the amount that the tubing exceeds 100 ft.(No additional refrigerating machine oil is needed.)1. Leak Test(1) With the service valves on the outdoor unit closed,remove the 1/4 in. fl are nut and its bonnet on the gastube service valve. (Save for reuse.)(2) Attach a manifold valve (with pressure gauges) anddry nitrogen gas cylinder to this service port withcharge hoses.CAUTIONUse a manifold valve for airpurging. If it is not available,use a stop valve for thispurpose. The “Hi” knob of themanifold valve must always bekept closed.Fig. 1-123Fig. 1-122Fig. 1-124Manifold valvePressuregauge Lo HiCharge hoseOutdoor unitLiquidtubeGastubeNitrogen gas cylinder(In vertical standingposition)CloseCloseOpenCylindervalveOutletInletVacuum pumpManifold gauge1