Worn oil pump Replace the oil pump | Greenheck Fan 473501 manual

Troubleshooting – Refrigeration Circuit

Symptom	Possible Cause	Corrective Action

	Low oil level (trapped oil in evaporator or suction	Thoroughly defrost evaporator. After defrost,
	Low oil level (trapped oil in evaporator or suction	observe level, add oil. Check for leaks. Check lines
	line).	observe level, add oil. Check for leaks. Check lines
	line).	for proper slope and traps.
		for proper slope and traps.

	Excessive liquid refrigerant in the crankcase.	Adjust expansion valve for higher superheat. Check
	Excessive liquid refrigerant in the crankcase.	crankcase heater.
		crankcase heater.
Low or no
Low or no	Worn oil pump.	Replace the oil pump.
oil pressure	Worn oil pump.	Replace the oil pump.
oil pressure
	Worn compressor bearings.	Replace the compressor.

	Loose fitting on oil line or pump housing gasket	Check and tighten system. Check bottom plate or
	leaking.	compressor.

	Compressor short cycling.	Check low pressure control setting.

	Refrigerant leak.	Check system for leaks. Repair leaks and add
	Refrigerant leak.	refrigerant.
		refrigerant.

	Short cycling.	Check low pressure control settings.
Compressor
Compressor		Check thermal expansion valve setting. Check for
loses oil	Refrigerant flood back.	Check thermal expansion valve setting. Check for
loses oil	Refrigerant flood back.	refrigerant overcharge.
		refrigerant overcharge.

	Improper piping or traps.	Verify proper piping slopes.

	Reheat flush cycle inadequate.	Contact factory.

	Refrigeration undercharged.	Check subcooling.

	Dirty filter or evaporator coil.	Check filter, coil and airflow.

	Dirty or clogged condenser coil.	Check coil and airflow.

	Air or other non-condensables in system.	Check equalized high side pressure with equivalent
Running cycle is	Air or other non-condensables in system.	outdoor temperature.
		outdoor temperature.

too long or unit
too long or unit	Defective compressor.	See “High suction pressure”.
operates	Defective compressor.	See “High suction pressure”.
operates
continuously	Restriction in suction and liquid line.	Check for restrictions in refrigerant circuit.
	Restriction in suction and liquid line.	Check for restrictions in refrigerant circuit.

	Control contacts stuck.	Check wiring.

	Excessive load.	Add more equipment or reduce room load.

	Too low of a system thermostat setting or	Adjust or replace thermostat.
	defective thermostat.	Adjust or replace thermostat.
	defective thermostat.

Liquid line	Refrigerant undercharge.	Adjust the charge by subcooling.
Liquid line
is too hot	High discharge pressure.	See “High discharge pressure”.
	High discharge pressure.	See “High discharge pressure”.

Liquid line is	Restriction in liquid line.	Clear restriction upstream of point of frosting.
frosted or wet	Restriction in liquid line.	Clear restriction upstream of point of frosting.
frosted or wet

	Insufficient evaporator airflow.	Check airflow, check filters, check drive for loose
	Insufficient evaporator airflow.	parts or belts.
Suction line		parts or belts.


is frosting	Restriction in suction or liquid line.	Restriction upstream of point of frosting.

	Malfunctioning or defective expansion valve.	Check bulb of thermal expansion valve.

Frost on	Hot gas bypass valve not functioning properly.	Check valve. If defective, replace.
Frost on
evaporator coil	Manual hot gas bypass valve closed.	Open valve.
	Manual hot gas bypass valve closed.	Open valve.

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 35

473501 specifications

Greenheck Fan 473501 is a significant player in the world of ventilation solutions, specifically designed to meet the increasing demands for efficiency and effectiveness in air movement. This commercial-grade fan is particularly noted for its high performance and reliability, making it a top choice for various applications, ranging from industrial settings to larger commercial spaces.

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Furthermore, Greenheck offers extensive support and resources for this model, ensuring users have access to the information necessary for optimal operation, maintenance, and any potential troubleshooting.

Overall, the Greenheck Fan 473501 represents a harmonious blend of efficiency, durability, and flexibility, making it an ideal choice for those seeking a high-quality ventilation solution that meets contemporary environmental standards while delivering reliable performance across diverse applications.

Troubleshooting – Refrigeration Circuit

Symptom

Worn oil pump.

Replace the oil pump.

473501 specifications