Carrier Infinity 480CEN024 Installation Instruction

SYMPTOMCompressor and condenser fan will not start,Compressor will not start but condenser fanrunsThree-phase scroll compressormakes excessive noise_ and there may be alow pressure differential,Compressor cycles (other than normally sat-isfying UI)Compressor operates continuouslyExcessive head preesureHead preesure too lowExcessive suction pressureSuction preeeure tOO lOWIFM does not runIFM operation is intermittentTable 6--Tl'aubleshooting ChartCAUSEPower failureFuse blown or circuit breaker trippedREMEDYCall power companyReplace fuse or reset circuit breakerDefective contactor, transformer, or high-pressure, Replace componentloss-of-charge or low-pressure switchDetermine cause and correctInsufficient line voltageIncorrect or faulty wiringUI setting too highFaulty wiring or loose connections in compressor cir-cuitCompressor motor burned out, seized, orinternal overload openDefective run/start capacitor, overload, start relayOne leg of 3-phase power deadLow input voltage (20% low)Scroll compressor is rotating in the wrong directionRefrigerant overcharge or underchargeDefective compressorInsufficient line voltageBlocked outdoor coilDefective run/start capacitorFaulty outdoor fan motor or capacitorRestriction in refrigerant systemDirty air filterUnit undersized for loadUI temperature set too lowLow refrigerant chargeAir in systemOutdoor coil dirty or restrictedDirty air filterDirty condenser coilRefrigerant overchargedAir in systemCondenser air restricted or air short-cyclingLow refrigerant chargeRestriction in liquid tubeHigh heat loadCompressor valves leakingRefrigerant overchargedDirty air filterLow refrigerant chargeMetering device or low side restrictedInsufficient evaporator airflowTemperature too low in conditioned areaOutdoor ambient below 55"FFilter drier restrictedBlower wheel not secured to shaftInsufficient voltage at motorPower connectors not properly sealedWater dripping into motorConnectors not firmly sealedCheck wiring diagram and rewire correctlyLower UI temperature setting below room tem-peratureCheck wiring and repair or replaceDetermine causeReplace compressorDetermine cause and replaceReplace fuse or reset circuit breakerDetermine causeDetermine cause and correctCorrect the direction of rotation by reversing the3-phase power leads to the unit. Shut down unitto allow pressures to equalize.Recover refrigerant, evacuate system, and re-charge to capacities shown on rating plateReplace and determine causeDetermine cause and correctDetermine cause and correctDetermine cause and replaceReplaceLocate restriction and removeReplace filterDecrease load or increase unit sizeReset UILocate leak, repair, and rechargeRecover refrigerant, evacuate system, and re-chargeClean coil or remove restrictionReplace filterClean coilRecover excess refrigerantRecover refrigerant, evacuate system, and re-chargeDetermine cause and correctCheck for leaks, repair, and recharge.Remove restrictionCheck for source and eliminateReplace compressorRecover excess refrigerantReplace filterCheck for leaks, repair and rechargeRemove source of restrictionIncrease air quantityCheck filtemreplace if necessaryReset UIInstall low-ambient kitReplace filterProperly tighten blower wheel to shaftDetermine cause and correctConnectors should snap easily; do not forceVerify proper drip loops in connector wiresGently pull wires individually to be sure they arecrimped into the housing28

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