TABLE 10—TROUBLESHOOTING — COOLING

SYMPTOM

CAUSE

REMEDY

 

Power failure

Call power company.

 

 

 

 

Fuse blown or circuit breaker tripped

Replace fuse or reset circuit breaker.

 

 

 

 

Defective thermostat, contactor, transformer,

 

 

control relay, high pressure, or loss of charge

Replace component.

Compressor and condenser fan will not start.

switch

 

 

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 tempera-

 

ture.

 

 

 

Faulty wiring or loose connections in compres-

Check wiring and repair or replace.

 

sor circuit

 

 

 

Compressor motor burned out, seized, or inter-

Determine cause. Replace compressor.

Compressor will not start but condenser fan

nal overload open

 

runs.

Defective run/start capacitor, overload, start re-

Determine cause and replace.

 

lay

 

 

 

One leg of 3-phase power dead

Replace fuse or reset circuit breaker. Determine

 

cause.

 

 

Three-phase scroll compressor makes ex-

Scroll compressor is rotating in the wrong direc-

Correct the direction of rotation by reversing the

cessive noise, and there may be a low pres-

3-phase power leads to the unit. Shut down unit

sure differential.

tion

to allow pressures to equalize.

 

 

Refrigerant overcharge or undercharge

Recover refrigerant, evacuate system, and re-

 

charge to capacities shown on nameplate.

 

 

 

Defective compressor

Replace and determine cause.

 

Insufficient line voltage

Determine cause and correct.

Compressor cycles (other than normally sat-

Blocked condenser

Determine cause and correct.

isfying thermostat).

Defective run/start capacitor, overload or start

Determine cause and replace.

 

relay

 

 

 

Defective thermostat

Replace thermostat.

 

Faulty condenser-fan motor or capacitor

Replace.

 

Restriction in refrigerant system

Locate restriction and remove.

 

Dirty air filter

Replace filter.

 

 

 

 

Unit undersized for load

Decrease load or increase unit size.

 

 

 

 

Thermostat set too low

Reset thermostat.

 

 

 

Compressor operates continuously.

Low refrigerant charge

Locate leak, repair, and recharge.

 

 

Leaking valves in compressor

Replace compressor.

 

 

 

 

 

Air in system

Recover refrigerant, evacuate system, and re-

 

charge.

 

 

 

Condenser coil dirty or restricted

Clean coil or remove restriction.

 

 

 

 

Dirty air filter

Replace filter.

 

 

 

 

Dirty condenser coil

Clean coil.

 

 

 

Excessive head pressure.

Refrigerant overcharged

Recover excess refrigerant.

 

 

Air in system

Recover refrigerant, evacuate system, and re-

 

 

charge.

 

 

 

Condenser air restricted or air short-cycling

Determine cause and correct.

 

Low refrigerant charge

Check for leaks, repair and recharge.

Head pressure too low.

Compressor valves leaking

Replace compressor.

 

Restriction in liquid tube

Remove restriction.

 

High heat load

Check for source and eliminate.

Excessive suction pressure.

Compressor valves leaking

Replace compressor.

 

Refrigerant overcharged

Recover excess refrigerant.

 

Dirty air filter

Replace filter.

 

Low refrigerant charge

Check for leaks, repair and recharge.

 

Metering device or low side restricted

Remove source of restriction.

Suction pressure too low.

Insufficient evaporator airflow

Increase air quantity. Check filter — replace if

necessary.

 

 

 

Temperature too low in conditioned area

Reset thermostat.

 

Outdoor ambient below 40 F

Install low-ambient kit.

 

Field-installed filter-drier restricted

Replace.

—26—

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Bryant 583B instruction manual Troubleshooting Cooling, Symptom Cause Remedy
Page 25 Page 27

583B specifications

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