Carrier 50JZ024 Installation, Start-up And Service Instructions Manual

Also see for 50JZ024: Installation and operating instructions Guide to operating and maintaining Guide to operating and maintaining Product data Product data

Contents

Troubleshooting Chart (cont’d)SYMPTOM CAUSE REMEDYSuction pressure too low (Cool) Dirty air filter Replace filter(Heat) Outdoor coil frosted Move timer on control board to 30 minutes be-tween defrost cyclesLow refrigerant charge Check for leaks, repair and rechargeMetering device or low side restricted Remove source of restriction(Cool) Insufficient coil airflow Increase air quantityCheck filter—replace if necessary(Cool) Temperature too low in conditioned area Reset thermostat(Cool) Outdoor ambient below 40°F Install low-ambient kitFilter-drier restricted ReplaceCompressor runs but outdoor fan does not NC (normally closed) contacts on defrost boardopenCheck condition of relay on boardReplace if necessaryIFM does not run Blower wheel not secured to shaft Properly tighten blower wheel to shaft.Insufficient voltage at motor Determine cause and correctPower connectors not properly sealed Connectors should snap easily; do not forceIFM operation is intermittentWater dripping into motor Verify proper drip loops in connector wiresConnectors not firmly sealed Gently pull wires individually to be sure they arecrimped into the housingIFM—Indoor Fan MotorSTART-UP CHECKLIST(REMOVE AND STORE IN JOB FILE)I. PRELIMINARY INFORMATIONModel No...............................................................................................................................................................................................................Serial No. ...............................................................................................................................................................................................................Date ........................................................................................................................................................................................................................Technician..............................................................................................................................................................................................................II. PRE-START-UP___ Verify that all packing materials have been removed from unit___ Remove all shipping holddown bolts and brackets per installation instructions___ Verify that condensate connection is installed per installation instructions___ Check all electrical connections and terminals for tightness___ Check that indoor (evaporator) air filter is clean and in place___ Verify that unit installation is level___ Check fan wheel and propeller for location in housing and setscrew tightnessIII. START-UPSupply Voltage: L1-L2 __________ L2-L3 _________ L3-L1 __________Compressor Amps: L1 __________ L2 _________ L3 __________Indoor Fan Amps: __________AIR TEMPERATUREOutdoor-Air Temperature: __________ DBReturn-Air Temperature: __________ DB __________ WBHeat Pump Supply Air: __________Electric Heater Supply Air: __________REFRIGERANT PRESSURES AND TEMPERATURESRefrigerant Suction __________ psigRefrigerant Discharge __________ psigSuction Line Temp*__________Discharge Line Temp†__________Liquid Line Temp‡_____________ Verify refrigerant charge using charging tables___ Verify 3-phase scroll compressor is rotating in correct direction.* Measured at suction inlet to compressor.† Measured at discharge outlet from compressor.‡ Measured at liquid line leaving condenser.25

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