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Bryant R-410A 583B User Manual

Page 26

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TABLE 10—TROUBLESHOOTING — COOLING

SYMPTOM

CAUSE

REMEDY

Compressor and condenser fan will not start.

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

switch

Replace component.

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.

Compressor will not start but condenser fan

runs.

Faulty wiring or loose connections in compres-

sor circuit

Check wiring and repair or replace.

Compressor motor burned out, seized, or inter-

nal overload open

Determine cause. Replace compressor.

Defective run/start capacitor, overload, start re-

lay

Determine cause and replace.

One leg of 3-phase power dead

Replace fuse or reset circuit breaker. Determine

cause.

Three-phase scroll compressor makes ex-

cessive noise, and there may be a low pres-

sure differential.

Scroll compressor is rotating in the wrong direc-

tion

Correct the direction of rotation by reversing the
3-phase power leads to the unit. Shut down unit

to allow pressures to equalize.

Compressor cycles (other than normally sat-

isfying thermostat).

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.

Blocked condenser

Determine cause and correct.

Defective run/start capacitor, overload or start

relay

Determine cause and replace.

Defective thermostat

Replace thermostat.

Faulty condenser-fan motor or capacitor

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.

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.

Excessive head pressure.

Dirty air filter

Replace filter.

Dirty condenser coil

Clean coil.

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.

Head pressure too low.

Low refrigerant charge

Check for leaks, repair and recharge.

Compressor valves leaking

Replace compressor.

Restriction in liquid tube

Remove restriction.

Excessive suction pressure.

High heat load

Check for source and eliminate.

Compressor valves leaking

Replace compressor.

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.

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.

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