Troubleshooting – Refrigeration Circuit

Symptom

Possible Cause

Corrective Action

 

 

 

 

Refrigerant overcharge.

Check pressures and subcooling.

 

 

 

 

Liquid floodback.

Check thermal expansion valve setting. Check for

 

refrigerant overcharge.

 

 

 

 

 

 

 

Dampen tubing vibration by taping or clamping.

Compressor noisy

Tubing rattle.

Carefully bend tubing away from contact where

or vibrating

 

possible.

 

Scroll compressor rotating in reverse (3 phase).

Rewire for opposite rotation.

 

 

 

 

Worn or damaged compressor.

Replace the compressor.

 

 

 

 

Improper mounting on unit base.

Check that compressor is properly isolated.

 

 

 

 

Excessive load on evaporator coil.

Check for high entering wet bulb temperature.

 

Check for excessive air.

 

 

 

 

 

 

 

Check head pressure, check thermal expansion

 

Compressor is unloaded.

valve if not functioning properly, check pressure

 

 

drop across filter drier.

 

 

 

 

 

Check the thermal expansion valve, ensure bulb is

 

 

insulated.

 

 

Check superheat. If superheat is high, then valve is

High suction

Expansion valve not secured to suction line.

out of control and pegged wide open.

pressure

 

• Check bulb for contact.

 

 

• Adjust valve for superheat.

 

 

• Replace valve powerhead or valve.

 

 

 

 

Thermostatic expansion valve pressure limit

Check bulb location and clamping. Adjust

 

feature incorrect or inoperative. Overfeeding.

superheat. Replace expansion valve power head.

 

 

 

 

Room load too large.

Reduce the load or add more equipment.

 

 

 

 

Overcharged.

Check pressures and subcooling.

 

 

 

 

Thermal expansion valve setting.

Check thermal expansion setting and calibrate

 

superheat.

 

 

 

 

 

 

Air inlet to condenser dirty or obstructed.

Check for proper clearances and possible air

 

recirculating.

 

 

 

 

 

 

Condenser fan motor defective.

Check condenser fan motor.

 

 

 

 

Too much refrigerant.

Remove excess refrigerant.

High discharge

 

 

Non-condensable in system.

Remove non-condensable from system.

pressure

 

 

 

 

Dirty condenser coil.

Clean condenser coil.

 

 

 

 

Condenser fan not running or running

Check electrical circuit and fuse. Check fan cycling

 

backwards.

controls.

 

 

 

 

Discharge service valve partially closed.

Open valve.

 

 

 

 

High load conditions.

Add more equipment or reduce load.

 

 

 

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

Model ERCH-HP Energy Recovery Unit 33

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Greenheck Fan 473501 manual Check bulb for contact
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