Carrier 50KC04-06 Service And Maintenance Instructions

11PURON® (R-410A) REFRIGERANTThis unit is designed for use with Puron (R-410A) refrigerant.Do not use any other refrigerant in this system.Puron (R-410A) refrigerant is provided in pink (rose) coloredcylinders. These cylinders are available with and without diptubes; cylinders with dip tubes will have a label indicating thisfeature. For a cylinder with a dip tube, place the cylinder in theupright position (access valve at the top) when removing liquidrefrigerant for charging. For a cylinder without a dip tube, in-vert the cylinder (access valve on the bottom) when removingliquid refrigerant.Because Puron (R-410A) refrigerant is a blend, it is stronglyrecommended that refrigerant always be removed from the cyl-inder as a liquid. Admit liquid refrigerant into the system in thedischarge line. If adding refrigerant into the suction line, use acommercial metering/expansion device at the gage manifold;remove liquid from the cylinder, pass it through the meteringdevice at the gage set and then pass it into the suction line as avapor. Do not remove Puron (R-410A) refrigerant from thecylinder as a vapor.Refrigerant ChargeAmount of refrigerant charge is listed on the unit’s nameplate.Refer to Carrier GTAC2-5 Charging, Recovery, Recycling andReclamation training manual and the following procedures.Unit panels must be in place when unit is operating during thecharging procedure.NO CHARGEUse standard evacuating techniques. After evacuating system,weigh in the specified amount of refrigerant.LOW-CHARGE COOLINGUsing Fig. 15-19, vary refrigerant until the conditions of theappropriate chart are met. Note the charging charts are differ-ent from type normally used. Charts are based on charging theunits to the correct superheat for the various operating condi-tions. Accurate pressure gage and temperature sensing deviceare required. Connect the pressure gage to the service port onthe suction line. Mount the temperature sensing device on thesuction line and insulate it so that outdoor ambient temperaturedoes not affect the reading. Indoor-air cfm must be within thenormal operating range of the unit.TO USE COOLING CHARGING CHARTSTake the outdoor ambient temperature and read the suctionpressure gage. Refer to chart to determine what suction tem-perature should be. If suction temperature is high, add refriger-ant. If suction temperature is low, carefully recover some of thecharge. Recheck the suction pressure as charge is adjusted.EXAMPLE:Model 50KC*A04Outdoor Temperature . . . . . . . . . . . . . . . . . . . . . . 85°F (29°C)Suction Pressure . . . . . . . . . . . . . . . . . . . . . 140 psig (965 kPa)Suction Temperature should be . . . . . . . . . . . . . . . 60°F (16°C)CompressorLUBRICATIONThe compressor is charged with the correct amount of oil at thefactory.REPLACING COMPRESSORThe compressor used with Puron refrigerant contains a POEoil. This oil has a high affinity for moisture. Do not remove thecompressor’s tube plugs until ready to insert the unit suctionand discharge tube ends. Compressor mounting bolt torque is65 to 75 ft-lb.SIZE DESIGNATION NOMINAL TONS REFERENCEA04 3A05 4A06 5CAUTIONUNIT DAMAGE HAZARDFailure to follow this caution may result in damage tocomponents.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 absorb 15times as much water as other oils designed for HCFC andCFC refrigerants. Avoid exposure of the oil to the atmosphere.