Carrier Aquazone 50RHE 006 Installation, Operation And Maintenance Instructions

Contents

30Table 16 - Troubleshooting (cont’d)Fault Heating Cooling Possible cause SolutionOnly compressor runs X X Thermostat wiring Check G wiring at heat pump. Jumper G and R for fan operation.X X Fan motor relay Jumper G and R for fan operation. Check for line voltage across BRcontacts.Check fan power enable relay operation (if present).X X Fan motor Check for line voltage at motor. Check capacitor.X X Thermostat wiring Check Y and W wiring at heat pump. Jumper Y and R for compressoroperation in Test mode.Unit does not operate X Reversing valve Set for cooling demand and check 24 V a.c. on RV coil and at control.in cooling If RV is stuck, run high pressure up by reducing water flow and whileoperating, engage and disengage RV coil voltage to push valve.X Thermostat setup Check for ‘O’ RV setup not ‘B’.X Thermostat wiring Check O wiring at heat pump. Jumper O and R for RV coil ‘Click’.Insufficient capacity/not X X Dirty filter Replace or clean.cooling or heating properly X Reduced or no airflow in heating Check for dirty air filter and clean or replace.Check fan motor operation and airflow restrictions.External static too high. Check blower Table 4.X Reduced or no airflow in cooling Check for dirty air filter and clean or replace.Check fan motor operation and airflow restrictions.External static too high. Check blower Table 4.X X Leaky ductwork Check supply and return air temperatures at the unit and at distant ductregisters if significantly different, duct leaks are present.X X Low refrigerant charge Check superheat and subcooling Table 9.X X Restricted metering device Check superheat and subcooling Table 9. Replace.X Defective reversing valve Perform RV touch test.X X Thermostat improperly located Check location and for air drafts behind thermostat.X X Unit undersized Recheck loads and sizing check sensible cooling load and heat pumpcapacity.X X Scaling in water heat exchanger Perform scaling check and clean if necessary.X X Inlet water too hot or cold Check load, loop sizing, loop backfill, ground moisture.High head pressure X Reduced or no airflow in heating Check for dirty air filter and clean or replace.Check fan motor operation and airflow restrictions.External static too high. Check blower Table 4.X Reduced or no water flow in cooling Check pump operation or valve operation/setting.Check water flow; adjust to proper flow rate. See Table 8.X Inlet water too hot Check load, loop sizing, loop backfill, ground moisture.X Air temperature out of range in heating Bring return air temperature within design parameters.X Scaling in water heat exchanger Perform scaling check and clean if necessary.X X Unit overcharged Check superheat and subcooling. Reweigh in charge.X X Non-condensables in system Vacuum system and reweigh in charge.X X Restricted metering device Check superheat and subcooling per Table 9. Replace.Low suction pressure X Reduced water flow in heating Check pump operation or water valve operation/setting.Plugged strainer or filter. Clean or replace.Check water flow adjust to proper flow rate.X Water temperature out of range Bring water temperature within design parameters.X Reduced airflow in cooling Check for dirty air filter and clean or replace.Check fan motor operation and airflow restrictions.External static too high. Check blower Table 4.X Air temperature out of range Too much cold vent air. Bring entering air temperature within designparameters.X X Insufficient charge Check for refrigerant leaks.Low discharge air X Too high airflow Check blower Table 4.temperature in heating X Poor performance See ‘Insufficient Capacity’.High humidity X Too high airflow Check blower Table 4.X Unit oversized Recheck loads and sizing check sensible cooling load and heat pumpcapacity.LegendRV - Reversing valve

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