Carrier 50TC*17 Series Service And Maintenance Instructions

24COMPRESSORSLubricationThe compressor is charged with the correct amount of oilat the factory.FIRE, EXPLOSION HAZARDFailure to follow thiswarning could result indeath, personal personalinjury and/or propertydamage.Never use air or gases containing oxygen for leaktesting or for operating refrigerant compressors.Pressurized mixtures of air or gases containingoxygen can lead to an explosion.! WARNINGPERSONAL INJURY AND ENVIRONMENTALHAZARDFailure to follow this WARNING can result inpersonal injury or death.Use a gauge set certified for use with Puron(R−410A) refrigerant to relieve presure and recoverall refrigerant before system repair or final unitdisposal.Wear safety glasses and gloves when handlingrefrigerants.Keep torches and other ignition sources away fromrefrigerants and oils.! WARNINGFIRE, EXPLOSION HAZARDFailure to follow thiswarning could result indeath, personal personalinjury and/or propertydamage.Never use non−certified refrigerants in this product.Non−certified refrigerant could contain contaminantthat could lead to unsafe operating conditions. UseONLY refrigerants that conform to AHRI Standard700.! WARNINGReplacing the CompressorThe compressor using Puron refrigerant contains a POEoil. This oil has a high affinity for moisture. Do notremove the compressor’s tube plugs until ready to insertthe unit suction and discharge tube line ends.UNIT DAMAGE HAZARDFailure to follow this caution may result in damage tocomponents.The compressor is in a Puron refrigerant system anduses a polyolester (POE) oil. This oil is extremelyhygroscopic, meaning it absorbs water readily. POEoils can absorb 15 times as much water as other oilsdesigned for HCFC and CFC refrigerants. Avoidexposure of the oil to the atmosphere.CAUTION!NOTE: Only factory−trained service technicians shouldremove and replace compressor units.Compressor Mounting Bolts: Compressor mountingbolts should be periodically inspected for proper tightness.Bolts should be tightened and have the torque set at 65−75in−lb (7.3 − 8.5 Nm).Compressor RotationOn 3−phase units with scroll compressors, it is importantto be certain the compressor is rotating in the properdirection. To determine whether or not the compressor isrotating in the proper direction:1. Connect service gauges to suction and discharge pres-sure fittings.2. Energize the compressor.3. The suction pressure should drop and the dischargepressure should rise, as is normal on any start−up.NOTE: If the suction pressure does not drop and thedischarge pressure does not rise to normal levels:4. Note that the evaporator fan is probably also rotatingin the wrong direction.5. Turn off power to the unit. Use applicable lockout/tagout procedures.6. Reverse any two of the unit power leads.7. Reapply power to the compressor.The suction and discharge pressure levels should nowmove to their normal start−up levels.NOTE: When the compressor is rotating in the wrongdirection, the unit makes an elevated level of noise anddoes not provide cooling.Filter DrierReplace the Filter Drier whenever the refrigerant systemis exposed to atmosphere. Only use factory specifiedliquid−line filter driers with working pressures no lessthan 650 psig (4482 kPa). Do not install a suction−linefilter drier in liquid line. A liquid−line filter drier designedfor use with Puron refrigerant is required on every unit.