Carrier WeatherMaster 48HC04 Service And Maintenance Instructions

Also see for WeatherMaster 48HC04 Series: Installation instructions

18COMPRESSORLubricationThe compressor is charged with the correct amount of oil at thefactory.Replacing CompressorNOTE: Only factory-trained service technicians should removeand replace compressor units.Compressor RotationNOTE: When the compressor is rotating in the wrong direction,the unit makes an elevated level of noise and does not providecooling.On 3-phase units with scroll compressors, it is important to be cer-tain compressor is rotating in the proper direction. To determine ifthe compressor is rotating in the proper direction:1. Connect service gages to suction and discharge pressurefittings.2. Energize the compressor.3. The suction pressure should drop and the discharge pres-sure should rise, as is normal on any start-up.NOTE: If the suction pressure does not drop and the dischargepressure does not rise to normal levels, the evaporator fan is prob-ably also rotating in the wrong direction.4. Turn off power to the unit.5. Reverse any two of the three unit power leads.6. Reapply electrical power to the compressor. The suctionpressure should drop and the discharge pressure shouldrise, which is normal for scroll compressors on start-up.7. Replace compressor if suction/discharge pressures are notwithin specifications for the specific compressor.The suction and discharge pressure levels should now move totheir normal start-up levels.Filter DrierReplace whenever refrigerant system is exposed to atmosphere.Only use factory-specified liquid-line filter driers with workingpressures no lower than 650 psig. Do not install a suction-line fil-ter drier in liquid line. A liquid-line filter drier designed for usewith Puron refrigerant is required on every unit.Condenser-Fan Adjustment1. Shut off unit power supply. Install lockout tag.2. Remove condenser-fan assembly (grille, motor, and fan).3. Loosen fan hub setscrews.4. Adjust fan height as shown in Fig. 30.5. Tighten setscrews.6. Replace condenser-fan assembly.Fig. 30 — Condenser Fan AdjustmentSee Fig. 31 for a typical piping schematic.CAUTIONUNIT DAMAGE HAZARDFailure to follow this caution may result in damage to compo-nents.The compressor is in a Puron® refrigerant system and uses apolyolester (POE) oil. This oil is extremely hygroscopic,meaning it absorbs water readily. POE oils can absorb15 times as much water as other oils designed for HCFC andCFC refrigerants. Avoid exposure of the oil to the atmosphere.WARNINGFIRE, EXPLOSION HAZARDFailure to follow this warning could result in death, seriouspersonal injury and/or property damage.Never use air or gases containing oxygen for leak testing or foroperating refrigerant compressors. Pressurized mixtures of airor gases containing oxygen can lead to an explosion.WARNINGFIRE, EXPLOSION HAZARDFailure to follow this warning could result in death, seriouspersonal injury and/or property damage.Never use non-certified refrigerants in this product. Non-certi-fied refrigerants could contain contaminates that could lead tounsafe operating conditions. Use ONLY refrigerants that con-form to AHRI Standard 700.CAUTIONINSTALLATION SITE DAMAGEFailure to follow this caution can result in damage to equip-ment location site.Puron (R-410A) refrigerant contains polyolester (POE) oil thatcan damage the roof membrane. Caution should be taken toprevent POE oil from spilling onto the roof surface.The factory also recommends that the suction and dischargelines be cut with a tubing cutter instead of using a torch to re-move brazed fittings.CAUTIONEQUIPMENT DAMAGE HAZARDFailure to follow this caution can result in premature wear anddamage to equipment.Scroll compressors can only compress refrigerant if rotat-ing in the right direction. Reverse rotation for extendedtimes can result in internal damage to the compressor.Scroll compressors are sealed units and cannot be repairedon site location.CONDUIT0.14 in. + 0.0 / -0.03