Panasonic U-36LE1U6 Technical Data Manual

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Panasonic U-36LE1U6 Technical Data Manual Manual pdf 52 page image

Design of Mini VRF SYSTEM2 - 42187654326. AIR PURGINGFig.2-25Fig.2-266. AIR PURGINGAir and moisture in the refrigerant system may haveundesirable effects as indicated below.pressure in the system risesoperating current risescooling (or heating) efficiency 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. Removethe valve caps from both the gas tube and liquid tubeservice valves on the outdoor unit. Note that both liquid andgas tube service valves on the outdoor unit are kept closedat this stage.Leak test(1) Attach a manifold valve (with pressure gauges) and drynitrogen gas cylinder to this service port with chargehoses.(2) Pressurize the system to no more than512 psig (36 kgf/cm 2 G) with dry nitrogen gas and closethe cylinder valve when the gauge reading reaches512 psig (36 kgf/cm 2 G). Then, test for leaks with liquidsoap.Manifold gaugeOutletInletVacuum pumpManifold valvePressuregauge Lo HiCharge hoseOutdoor unitLiquidtubeGastubeNitrogen gas cylinder(In vertical standingposition)CloseOpenCloseOpenCylindervalveService port ø5/16"CAUTIONCAUTIONFig.2-27Use a manifold valve for airpurging. If it is not available, usea stop valve for this purpose. The“Hi” knob of the manifold valvemust always be kept closed.To avoid nitrogen entering therefrigerant system in a liquid state,the top of the cylinder must behigher than the bottom when youpressurize the system. Usually, thecylinder is used in a verticalstanding position. (Refer to theprevious page.)