Carrier 30RAP010-060 specifications Troubleshooting

Table 41 — Troubleshooting

SYMPTOMS	CAUSE	REMEDY
Cooler Circulating Pump Does	Power line open	Reset circuit breaker.
Not Run
	Control fuse or circuit breaker open	Check control circuit for ground or short. Reset breaker and
		replace fuse.
	Tripped power breaker	Check the controls. Find the cause of trip and reset breaker.
	Loose terminal connection	Check connections.
	Improperly wired controls	Check wiring and rewire if necessary.
	Low line voltage	Check line voltage — determine location of
		voltage drop and remedy deficiency.
	Pump motor defective	Check motor winding for open or short.
		Replace compressor if necessary.
	Pump seized	Replace pump.
Compressor Cycles	Low refrigerant charge	Repair leak and recharge.
Off on Loss of Charge
Compressor Cycles Off on Cooler	Thermistor failure	Replace thermistor.
Freeze Protection
	System load was reduced faster than controller could	Unit will restart after fluid temperature rises back into the
	remove stages	control band. Avoid rapidly removing system load.
Compressor Shuts Down on	High-pressure control acting erratically	Replace control.
High-Pressure Control
	Noncondensables in system	Evacuate and recharge.
	Condenser dirty	Clean condenser.
	Fans not operating	Repair or replace if defective.
	System overcharged with refrigerant	Reduce charge.
Unit Operates Too Long	Low refrigerant charge	Add refrigerant.
or Continuously
	Control contacts fused	Replace control.
	Partially plugged or plugged expansion valve or filter drier	Clean or replace as needed.
	Defective insulation	Replace or repair as needed.
	Damaged compressor	Check compressor and replace if necessary.
Unusual or Loud System	Piping vibration	Support piping as required.
Noises		Check for loose pipe connections or damaged compressor
	Compressor noisy	Replace compressor (worn bearings).
		Check for loose compressor holddown bolts.
Compressor Loses Oil	Leak in system	Repair leak.
	Mechanical damage (Failed seals or broken scrolls)	Replace compressor.
	Oil trapped in line	Check piping for oil traps.
Hot Liquid Line	Shortage of refrigerant due to leak	Repair leak and recharge.
Frosted Liquid Line	Restricted filter drier	Replace filter drier.
Frosted Suction Line	Expansion valve admitting excess refrigerant (note: this is a	Replace valve if defective.
	normal condition for brine applications)
	Stuck EXV	Replace valve if defective.
Freeze-Up	Improper charging	Make sure a full quantity of fluid is flowing through the cooler
		while charging, and suction pressure in cooler is equal to or
		greater than pressure corresponding to 32 F (0° C).
	System not drained for winter shutdown	Recommended that system be filled with an appropriate gly-
		col mixture to prevent freezing of pumps and fluid tubing.
	Loose Thermistor	Verify thermistors are fully inserted in wells.

66