Carrier 50YDV Installation, Operation And Maintenance Instructions

Carrier 50YDV Installation, Operation And Maintenance Instructions Manual pdf 45 page image

45R e s i d e n t i a l P a c k a g e d U n i t s - 6 0 H z P u r o n ®R e v. : 4 J a n . , 2 0 1 2Functional TroubleshootingFault Htg Clg Possible Cause SolutionMain power problems X X Green Status LED OffCheck line voltage circuit breaker and disconnect.Check for line voltage between L1 and L2 on the contactor.Check for 24VAC between R and C on DXM2Check primary/secondary voltage on transformer.HP/HPWS FaultCode 2High PressureX Reduced or no water flow in cooling Check pump operation or valve operation/setting.Check water flow adjust to proper flow rate.X Water Temperature out of range in cooling Bring water temp within design parameters.X Reduced or no air flow in heatingCheck for dirty air filter and clean or replace.Check fan motor operation and airflow restrictions.Dirty Air Coil- construction dust etc.Too high of external static. Check static vs blower table.X Air temperature out of range in heating Bring return air temp within design parameters.X X Overcharged with refrigerant Check superheat/subcooling vs typical operating condition table.X X Bad HP Switch Check switch continuity and operation. Replace.X X Water pressure too high Reduce water pressure to below 300 psigX X Bad high pressure water switch Replace HPWSLP/LOC FaultCode 3Low Pressure / Loss of ChargeX X Insufficient charge Check for refrigerant leaksX Compressor pump down at start-up Check charge and start-up water flow.LT1 FaultCode 4Water coil lowtemperature limitX Reduced or no water flow in heatingCheck pump operation or water valve operation/setting.Plugged strainer or filter. Clean or replace..Check water flow adjust to proper flow rate.X Inadequate antifreeze level Check antifreeze density with hydrometer.X Improper temperature limit setting (30°F vs10°F [-1°C vs -2°C]) Clip JW3 jumper for antifreeze (10°F [-12°C]) use.X Water Temperature out of range Bring water temp within design parameters.X X Bad thermistor Check temp and impedance correlation per chartLT2 FaultCode 5Air coil lowtemperature limitX Reduced or no air flow in coolingCheck for dirty air filter and clean or replace.Check fan motor operation and airflow restrictions.Too high of external static. Check static vs blower table.X Air Temperature out of range Too much cold vent air? Bring entering air temp within design parameters.X Improper temperature limit setting (30°F vs10°F [-1°C vs -12°C]) Normal airside applications will require 30°F [-1°C] only.X X Bad thermistor Check temp and impedance correlation per chart.Condensate FaultCode 6X X Blocked drain Check for blockage and clean drain.X X Improper trap Check trap dimensions and location ahead of vent.X Poor drainageCheck for piping slope away from unit.Check slope of unit toward outlet.Poor venting. Check vent location.X Moisture on sensor Check for moisture shorting to air coil.X X Plugged air filter Replace air filter.x X Restricted Return Air Flow Find and eliminate restriction. Increase return duct and/or grille size.Over/UnderVoltage Code 7(Auto resetting)X X Under VoltageCheck power supply and 24VAC voltage before and during operation.Check power supply wire size.Check compressor starting. Need hard start kit?Check 24VAC and unit transformer tap for correct power supply voltage.X X Over Voltage Check power supply voltage and 24VAC before and during operation.Check 24VAC and unit transformer tap for correct power supply voltage.Unit Performance SentinelCode 8X Heating mode LT2>125°F [52°C] Check for poor air flow or overcharged unit.X Cooling Mode LT1>125°F [52°C] OR LT2<40ºF [4ºC]) Check for poor water flow, or air flow.No Fault Code ShownX X No compressor operation See "Only Fan Operates".X X Compressor overload Check and replace if necessary.X X Control board Reset power and check operation.Unit Short CyclesX X Dirty air filter Check and clean air filter.X X Unit in "test mode" Reset power or wait 20 minutes for auto exit.X X Unit selection Unit may be oversized for space. Check sizing for actual load of space.X X Compressor overload Check and replace if necessaryOnly Fan RunsX X Thermostat position Ensure thermostat set for heating or cooling operation.X X Unit locked out Check for lockout codes. Reset power.X X Compressor Overload Check compressor overload. Replace if necessary.X X Thermostat wiring Check thermostat wiring at heat pump. Jumper Y1 and R for compressor operationin test mode.