Carrier 38GL...G Installation Manual

Contents

GB - 1238GL...G / 38GLS...G / 38YY...G / 38YYS...G R-410ATroubleshootingCompressor and fan of the outdoor unit will not start:• Unit not energized; check the mains power connections.• Main switch OFF; check and put to the ON position.• Main switch fuses have blown; replace.• Wait for 3 minutes; compressor cycling protection is on.• Pressure switch open; check and eliminate cause.• Mains voltage too low.• Electrical connections loose or wrong; check and repair.Compressor will not start, but outdoor fan is running:• Electrical connections of compressor loose or wrong; check and repair.• Compressor burnt out, seized or protection device on; check forthe cause and replace compressor if necessary.• Run capacitor faulty (single-phase models); replace.Compressor starts, but stops due to its overtemperatureprotection (other than stops caused by the normal operationof the thermostat):• Wrong refrigerant charge (excessive or low) or air or other noncondensable gases in the circuit; drain refrigerant (see note 1),evacuate and recharge.• Mains voltage wrong (too high or too low).• Condenser coil (outdoor or indoor, in case of heat pumpoperation) obstructed; remove obstructions.• Outdoor fan off; check cause and repair.• Run capacitor faulty; check and replace.• Refrigerant circuit clogged; check and remove obstructions.• Reversing valve faulty on heat pump models; replace.• Expansion device clogged or covered with ice; drain refrigerant(see note 1), evacuate and recharge.Compressor runs continuously:• Unit selected too small for actual air conditioning needs.• Indoor temperature selection too low (if in cooling) or too high (if inheating, for heat pump models); check temperature selection.• Refrigerant charge low; check and add refrigerant.• Condenser fan (outdoor or indoor, in case of heat pump operation)faulty; replace.• Air or other non condensable gases in the circuit; drain refrigerant(see note 1), evacuate and recharge.• Obstructions at air intake or dirty indoor unit filters; removeobstruction or clean filter.Frequent ice build-up on outdoor coil (during heating withheat pump units):• Outdoor fan stopped; check cause and repair.• Wrong electrical connections between indoor and outdoor units;check electrical connections and repair.• Check defrost end thermostat positioning and connection.Discharge pressure too high:• Outdoor coil dirty or obstructed; clean or remove obstructions.• Condenser fan (outdoor or indoor, in case of heat pump operation)faulty; replace.• Refrigerant charge too high; drain some refrigerant (see note 1).• Air or other non-condensable gases in the circuit; drain refrigerant(see note 1), evacuate and recharge.Discharge pressure too low:• Refrigerant charge too low; add refrigerant.• Outdoor coil dirty or obstructed; clean or remove obstructions.• Indoor unit air filter dirty; clean filter.Suction pressure too high:• Refrigerant charge too high; drain some refrigerant (see note 1).• Reversing valve faulty or internal leak; replace.Suction pressure too low:• Refrigerant charge too low; add refrigerant.• Evaporator coil (indoor or outdoor, in case of heat pumpmodels),covered with ice; see the following points.• Air circulation on the evaporator unit (indoor or outdoor, in case ofheat pump models) not sufficient; check for the cause and repair.• Expansion device or suction line clogged: check and repair.• Outdoor fan does not stop during defrost periods (when heatingwith heat pump models); check electrical connections.Outdoor fan cycling due to its overtemperature protection:• Fan capacitor faulty; replace.• Electrical connection loose; check connections.• Fan bearing seized; check and repair.Outdoor fan motor running always at low speed:• Wiring not connected to the board; check connections betweentemperature sensor and board.• Temperature sensor is fault; replace the sensor.• Electronic board broken; replace board.Outdoor fan motor running always at high speed:• Temperature sensor is short circuited; replace temperaturesensor.• Electronic board broken; replace board.Note 1: Do not release refrigerant to the atmosphere;use refrigerant recovery equipment.Guide for the ownerWhen installation and tests are completed explain the Operationand Maintenance Manual to the owner, with particular attention tothe main operating modes of the air conditioner, such as:• Turning the unit on and off.• Functions of the remote control.• Removal and cleaning of the air filters.Leave the two installation manuals for the indoor and outdoor unitswith the owner for future use during maintenance operations or forany other needs.Unit maintenance, troubleshooting and guide for the ownerUnit maintenanceThe following maintenance operations must be carried out byqualified personnel.Cleaning the coilWhen necessary, proceed as follows for more careful cleaning ofthe coil:Switch the mains supply OFF.Remove unit top cover by loosening holding screws and liftingthe cover.Carefully clean the coil with a vacuum cleaner from inside to outside.With the same vacuum cleaner, dust the inside of the fancompartment and the fan blades. Avoid any damage to the bladeswhich may cause future vibrations and noise.Replace the unit cover and tighten the screws.After long shutdown periods and at commissioning(for heat pump models only)Energize the system by putting the main switch to ON withoutstarting the unit. (Remote control must be in the OFF position).Do not disconnect the main switch during the unit operating season.

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