Troubleshooting, Cooling Service Analysis

TROUBLESHOOTING

Refer to Tables 18 and 19 for troubleshooting details.

Table 18 — Cooling Service Analysis

PROBLEM	CAUSE	REMEDY
Compressor and condenser fan will	Power failure.	Call power company.
not start.	Fuse blown or circuit breaker tripped.	Replace fuse or reset circuit breaker.
	Defective thermostat, contactor, transformer,	Replace component.
	or control relay.
	Insufficient line voltage.	Determine cause and correct.
	Incorrect or faulty wiring.	Check wiring diagram and rewire correctly.
	Thermostat setting too high.	Lower thermostat setting below room
		temperature.
Compressor will not start but	Faulty wiring or loose connections in	Check wiring and repair or replace.
condenser fan runs.	compressor circuit.
	Compressor motor burned out, seized, or	Determine cause. Replace compressor.
	internal overload open.
	Defective overload.	Determine cause and replace.
	Compressor locked out.	Determine cause for safety trip and reset
		lockout.
	One leg of 3-phase power dead.	Replace fuse or reset circuit breaker.
		Determine cause.
Compressor cycles (other than	Refrigerant overcharge or undercharge.	Recover refrigerant, evacuate system, and recharge to
normally satisfying thermostat).		nameplate.
	Defective compressor.	Replace and determine cause.
	Insufficient line voltage.	Determine cause and correct.
	Blocked condenser.	Determine cause and correct.
	Defective overload.	Determine cause and replace.
	Defective thermostat.	Replace thermostat.
	Faulty condenser-fan motor.	Replace.
	Restriction in refrigerant system.	Locate restriction and remove.
Compressor operates continuously.	Dirty air filter.	Replace filter.
	Unit undersized for load.	Decrease load or increase unit size.
	Thermostat set too low.	Reset thermostat.
	Low refrigerant charge.	Locate leak, repair, and recharge.
	Air in system.	Recover refrigerant, evacuate system, and recharge.
	Condenser coil dirty or restricted.	Clean coil or remove restriction.
Excessive head pressure.	Dirty air filter.	Replace filter.
	Dirty condenser coil.	Clean coil.
	Refrigerant overcharged.	Recover excess refrigerant.
	Faulty TXV.	1. Check TXV bulb mounting and secure tightly to
		suction line.
		2. Replace TXV if stuck open or closed.
	Air in system.	Recover refrigerant, evacuate system, and recharge.
	Condenser air restricted or air short-cycling.	Determine cause and correct.
Head pressure too low.	Low refrigerant charge.	Check for leaks, repair, and recharge.
	Restriction in liquid tube.	Remove restriction.
Excessive suction pressure.	High heat load.	Check for source and eliminate.
	Faulty TXV.	1. Check TXV bulb mounting and secure tightly to
		suction line.
		2. Replace TXV if stuck open or closed.
	Refrigerant overcharged.	Recover excess refrigerant.
Suction pressure too low.	Dirty air filter.	Replace filter.
	Low refrigerant charge.	Check for leaks, repair, and recharge.
	Metering device or low side restricted.	Remove source of restriction.
	Faulty TXV.	1. Check TXV bulb mounting and secure tightly to
		suction line.
		2. Replace TXV if stuck open or closed.
	Insufficient evaporator airflow.	Increase air quantity. Check filter and replace if necessary.
	Temperature too low in conditioned area.	Reset thermostat.
	Field-installed filter drier restricted.	Replace.
Compressor no. 2 will not run.	Unit in economizer mode.	Proper operation; no remedy necessary.
LEGEND
TXV — Thermostatic Expansion Valve

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581A specifications

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