Troubleshooting – Refrigeration Circuit

Symptom

Possible Cause

Corrective Action

 

 

 

 

Refrigerant overcharge.

Check pressures, charge by subcooling.

 

 

 

 

Condenser fan motor defective.

Check fan motor.

Compressor starts

 

 

Condenser coil inlet obstructed or dirty.

Check coil and inlet clearances.

but cuts out on high

 

 

 

 

pressure switch

Air or non-condensables in system.

Check high side equalized pressure reading with

 

equivalent outdoor temperature.

 

 

 

 

 

High pressure

Defective high pressure switch.

Replace.

activates at

 

 

 

Check refrigerant line pressures, check thermal

600 PSIG for

Restriction in discharge or liquid line.

R410A

expansion valves.

 

 

 

 

 

Condensing fan relay not pulling in.

Replace.

 

 

 

 

Reheat valve and bypass valve not opening.

Check valves or valve circuit board.

 

 

 

 

Low voltage.

Check voltage.

 

 

 

 

Sustained high discharge pressure.

Check running amperage and conditions described

 

under ‘Low suction pressure’ symptoms.

 

 

 

 

 

 

High suction and discharge pressures.

Check thermal expansion valve setting, check for

 

air in system.

 

 

 

 

 

 

Defective compressor overload.

If compressor is hot, allow compressor to cool for

Compressor cuts out

two hours. Recheck for open circuit.

 

on thermal overload

 

 

Improper refrigerant charge.

Check subcooling.

 

 

 

 

 

Improperly wired.

Review wiring schematics.

 

 

 

 

Loose wiring.

Check all connections and wires.

 

 

 

 

Defective start relay.

Replace relay.

 

 

 

 

Motor windings damaged.

Verify amp draw.

 

 

 

 

Improperly wired.

Review wiring schematics.

 

 

 

 

Low line voltage.

Check voltage.

 

 

 

 

Loose wiring.

Check all connections.

Compressor hums,

 

 

Defective start or run capacitor.

Check run capacitor for compressor and fan motor.

but will not start

 

 

 

Defective relay start.

Replace relay.

 

 

 

 

Motor winding damaged.

Verify amp draws.

 

 

 

 

Internal compressor mechanical damage.

Replace.

 

 

 

Always have a completed Pre Start-Up Checklist and Unit Start-Up Checklist prior to requesting parts or service information.

32 Model ERCH-HP Energy Recovery Unit

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Greenheck Fan 473501 manual Two hours. Recheck for open circuit
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473501 specifications

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