Troubleshooting Refrigeration Circuit

Troubleshooting – Refrigeration Circuit

TROUBLESHOOTING NOTE

Before any components are changed on the refrigeration system, the cause of the failure must be identified. Further problems will exist unless the true cause or problem is identified and corrected.

IMPORTANT

Do not release refrigerant to the atmosphere! If required service procedures include the adding or removing of refrigerant, the service technician must comply with all federal, state and local laws. The procedures discussed in this manual should only be performed by an EPA Certified Technician.

NOTE: Unit is equipped with a phase loss/phase reversal control. If system does not start, check phase of electrical supply.

Symptom	Possible Cause	Corrective Action

	Open disconnect switch or circuit breaker.	Close switch and / or breaker.

	Compressor contactor not closing.	Check voltage to contactor coil, transformer, slave
	Compressor contactor not closing.	relay, system. Replace parts as necessary.
		relay, system. Replace parts as necessary.

	Blown fuse or tripped breaker.	Check for reason and repair. Replace fuse after
	Blown fuse or tripped breaker.	correcting problem.
		correcting problem.

	Low line voltage.	Check line voltage. If more than 10% from
	Low line voltage.	compressor marking, correcting is necessary.
		compressor marking, correcting is necessary.

		Motor thermal protector automatically resets.
	Compressor motor protector open.	Allow time (2 hrs.) for compressor to cool down so
Compressor	Compressor motor protector open.	protector will reset. Restart and check for reason
		protector will reset. Restart and check for reason
		overheat occurred.
will not run		overheat occurred.
will not run
or		Check motor for open circuit, short circuit,
does not	Compressor defective.	grounded windings or burn out.
try to start	Compressor defective.	Compressor may be seized; check refrigerant.
try to start		Compressor may be seized; check refrigerant.
		If necessary, replace compressor.

		If manual reset (high pressure), reset switch.
		(Switch opens at 600 psi and will not reset above
	High or low pressure switch open or defective.	420 psi for R-410A.
		If auto reset (low pressure) does not reset and
		everything else is OK, replace switch.

	Open room thermostat or control	Check room temperature. If temperature is proper,
	(no cooling required).	wait for thermostat to close.

	Loose wiring.	Check all wire terminals and tighten as necessary.

	Low refrigerant charge.	Check refrigerant pressures.
Compressor starts
Compressor starts		Check for dirty evaporator coil, dirty filters,
but cuts out on low	Airflow restricted.	dampers closed, iced evaporator coil, improper
pressure		belt, check motor amps, check duct design.

Low pressure		Check refrigerant pressure, check and adjust
Low pressure	Restriction in refrigerant line.	thermal expansion valve. If not functioning properly,
switch activates	Restriction in refrigerant line.	thermal expansion valve. If not functioning properly,
switch activates		check for pressure drop across the filter drier.
at 50 PSIG for R-410A		check for pressure drop across the filter drier.
at 50 PSIG for R-410A
	Defective low pressure switch.	Replace.

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 31

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