Carrier 50SS018-060 Installation, Start-up And Service Instructions Manual

Contents

TROUBLESHOOTING COOLING CHARTSYMPTOM CAUSE REMEDYCompressor and con-denser fan will notstart.Power failure Call power company.Fuse blown or circuit breaker tripped Replace fuse or reset circuit breaker.Defective thermostat, contactor, transformer,or control relayReplace component.Insufficient line voltage Determine cause and correct.Incorrect or faulty wiring Check wiring diagram and rewire correctly.Thermostat setting too high Lower thermostat setting below room temperature.Single-phase units with scroll compressor(50SS048,060 and 50SX) have a 5-minute time delay DO NOT bypass this compressor time delay — waitfor 5 minutes until time-delay relay is deenergized.Compressor will notstart but condenserfan runs.Faulty wiring or loose connections incompressor circuitCheck wiring and repair or replace.Compressor motor burned out, seized, orinternal overload open Determine cause. Replace compressor.Defective run/start capacitor, overload,or start relayDetermine cause and replace.One leg of 3-phase power dead Replace fuse or reset circuit breaker.Determine cause.Three-phase scrollcompressor(50SS048, 060;50SX036-060units only) makes ex-cessive noise, andthere may be a lowpressure differential.Scroll compressor is rotating in thewrong directionCorrect the direction of rotation by reversing the3-phase power leads to the unit.Compressor cycles(other than normallysatisfying thermostat).Refrigerant overcharge or undercharge Reclaim refrigerant, evacuate system, and rechargeto capacities shown on nameplate.Defective compressor Replace and determine cause.Insufficient line voltage Determine cause and correct.Blocked condenser Determine cause and correct.Defective run/start capacitor, overloador start relayDetermine cause and replace.Defective thermostat Replace thermostat.Faulty condenser-fan motor or capacitor Replace.Restriction in refrigerant system Locate restriction and remove.Compressor operatescontinuously.Dirty air filter Replace filter.Unit undersized for load Decrease load or increase unit size.Thermostat set too low Reset thermostat.Low refrigerant charge Locate leak, repair and recharge.Leaking valves in compressor Replace compressor.Air in system Reclaim refrigerant, evacuate system and recharge.Condenser coil dirty or restricted Clean coil or remove restriction.Excessive headpressure.Dirty air filter Replace filter.Dirty condenser coil Clean coil.Refrigerant overcharged Reclaim excess refrigerant.Air in system Reclaim refrigerant, evacuate system and recharge.Condenser air restricted or air short-cycling Determine cause and correct.Head pressure too low. Low refrigerant charge Check for leaks, repair and recharge.Compressor valves leaking Replace compressor.Restriction in liquid tube Remove restriction.Excessive suctionpressure. High heat load Check for source and eliminate.Compressor valves leaking Replace compressor.Refrigerant overcharged Reclaim excess refrigerant.Suction pressure toolow.Dirty air filter Replace filter.Low refrigerant charge Check for leaks, repair and recharge.Metering device or low side restricted Remove source of restriction.Insufficient evaporator airflow Increase air quantity. Check filter — replace ifnecessary.Temperature too low in conditioned area Reset thermostat.Outdoor ambient below 40 F Install low-ambient kit.Field-installed filter-drier restricted Replace.42