Panasonic U-4LE1E5 Installation Instructions Manual

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Panasonic U-4LE1E5 Installation Instructions Manual Manual pdf 23 page image

22CAUTIONIf the exterior of the outdoor unit valveshas been finished with a square ductcovering, make sure you allow sufficientspace to use the valves and to allow thepanels to be attached and removed.Taping the flare nutsWind the white insulation tape around the flare nuts at the gastube connections. Then cover up the tubing connections withthe flare insulator, and fill the gap at the union with the suppliedblack insulation tape. Finally, fasten the insulator at both endswith the supplied vinyl clamps. (Fig. 5-8)Fig. 5-8Insulation materialThe material used for insulation must have good insulationcharacteristics, be easy to use, be age resistant, and must noteasily absorb moisture.CAUTIONAfter a tube has been insulated, never tryto bend it into a narrow curve because itcan cause the tube to break or crack.Fig. 5-9Never grasp the drain or refrigerant connecting outletswhen moving the unit.5-4. Taping the Tubes(1) At this time, the refrigerant tubes (and electrical wiringif local codes permit) should be taped together witharmoring tape in 1 bundle. To prevent condensation fromoverflowing the drain pan, keep the drain hose separatefrom the refrigerant tubing.(2) Wrap the armoring tape from the bottom of the outdoorunit to the top of the tubing where it enters the wall. As youwrap the tubing, overlap half of each previous tape turn.(3) Clamp the tubing bundle to the wall, using 1 clamp approx.each meter. (Fig. 5-10)Fig. 5-10NOTEDo not wind the armoring tape too tightly since this willdecrease the heat insulation effect. Also ensure that thecondensation drain hose splits away from the bundle and dripsclear of the unit and the tubing.Sealer (supplied) Insulation tape (white)(supplied)Flare insulator (supplied)Tube insulator(not supplied)Heat resistant120°C or aboveVinyl clamps (supplied)Flare nutUnit sideinsulatorClampDrain hoseInsulated tubes5-5. Finishing the InstallationAfter finishing insulating and tapingover the tubing, use sealing putty toseal off the hole in the wall to preventrain and draft from entering. (Fig. 5-11)Fig. 5-116. AIR PURGINGAir and moisture in the refrigerantsystem may have undesirable effectsas indicated below.● pressure in the system rises● operating current rises● cooling (or heating) efficiency drops● moisture in the refrigerant circuit mayfreeze and block capillary tubing● water may lead to corrosion of partsin the refrigerant systemTherefore, the indoor unit and tubingbetween the indoor and outdoor unitmust be leak tested and evacuatedto remove any noncondensables andmoisture from the system.(Figs. 6-1 and 6-2)Fig. 6-2■ Air Purging with a Vacuum Pump (for Test Run)PreparationCheck that each tube (both liquid and gas tubes) between theindoor and outdoor units has been properly connected and allwiring for the test run has been completed. Remove the valvecaps from both the gas tube and liquid tube service valves onthe outdoor unit. Note that both liquid and gas tube servicevalves on the outdoor unit are kept closed at this stage.(Fig. 6-3)Lo HiFig. 6-3Manifold gaugeVacuum pumpFig. 6-1OutletInletManifold valvePressuregaugeGas tubeLiquid tubeCloseCloseOpenOpenCylindervalveCharge hoseNitrogen gas cylinder(In vertical standingposition)Outdoor unitService port ø7.94 mmRefrigerant tubing and insulator (not supplied)Drain pipe and insulator (not supplied)Drain insulatorand clamp. Large(supplied)Packing clamp.Small hose band(supplied)Insulation tapeVinyl clampFlare insulatorSeal The procedure used forinstalling the insulatorfor both gas and liquidtubes is the same.Apply putty hereTubingAMP Air Conditioningwww.ampair.co.uk | sales@ampair.co.uk