Carrier 30HK040-060, 30HW018-040, 30HL050 specifications Ð Troubleshooting cont

Table 14 Ð Troubleshooting (cont)

SYMPTOMS	CAUSE	REMEDY
Compressor	Leak in system	Repair leak.
loses oil	Mechanical damage (blown piston or broken	Repair damage or replace compressor as needed.
	discharge valve)
	Oil trapped in line	Check piping for oil traps.
	Crankcase heater not energized	Check wiring and crankcase heater contacts on the
	during shutdown	temperature controller, and replace heater if necessary.
Hot liquid line	Shortage of refrigerant due to leak	Repair leak and recharge.
Frosted liquid line	Shutoff valve partially closed or restricted	Open valve or remove restriction.
	Restricted ®lter drier	Replace ®lter drier.
Frosted suction line	Expansion valve admitting excess refrigerant	Adjust expansion valve. Replace valve if defective.
Compressor will	Burned-out coil	Replace coil.
not unload
	Defective capacity control valve	Replace valve.
	Miswired solenoid	Rewire correctly.
	Weak, broken, or wrong valve body spring	Replace spring.
Compressor will	Miswired solenoid	Rewire correctly.
not load
	Defective capacity control valve	Replace valve.
	Plugged strainer (high side)	Clean or replace strainer.
	Stuck or damaged unloader piston or piston ring(s)	Clean or replace the necessary parts.
System noises	Piping vibration	Support piping as required.
		Check for loose pipe connectors.
	Expansion valve hissing	Add refrigerant.
		Check for plugged liquid line strainer.
	Compressor noisy	Check valve plates for valve noise.
		Replace compressor (worn bearings).
		Check for loose compressor holddown bolts.
Freeze-up	Improper charging	Make sure a full quantity of ¯uid is ¯owing through the
		cooler while charging, and suction pressure in cooler is
		equal to or greater than pressure corresponding to 32 F
		(0° C) (58 psig [400 kPa] for Refrigerant 22).
	Improperly set safety thermostat	Check safety thermostat for proper setting at beginning of
		each season.
	Operating with safety thermostat bypassed	If thermostat was bypassed for checking, be sure it is back
		in circuit before starting unit.
	Improper circulation of condenser water	Use adequately sized cleanable strainer in the condenser
		water circuit. Make sure strainer is clean. It may sometimes
		be necessary to chemically treat the water to prevent for-
		mation of deposits.
	System not drained for winter shutdown	Remove drain plugs at end of cooling season. Blow out any
		residual water. Instead of draining, a suitable anti-freeze
		may be added to the water. Damage to chiller due to freez-
		ing is considered abuse and is not covered by warranty.
	Loose Thermistor	Tighten thermistor to pipe and reinsulate (30HW).

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