Table 20 Ð Cooling Service Analysis

PROBLEM

CAUSE

REMEDY

Compressor and

Power failure.

Call power company.

condenser fan

Fuse blown or circuit breaker tripped.

Replace fuse or reset circuit breaker.

will not start.

Defective thermostat, contactor, transformer,

Replace component.

 

 

control relay or capacitor.

 

 

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

Faulty wiring or loose connections in compressor

Check wiring and repair or replace.

but condenser fan runs.

circuit.

 

 

Compressor motor burned out, seized, or internal

Determine cause. Replace compressor.

 

overload open.

 

 

Defective run/start capacitor, overload, start relay.

Determine cause and replace.

 

One leg of of 3-phase power dead.

Replace fuse or reset circuit breaker.

 

 

Determine cause.

Compressor cycles

Refrigerant overcharge or undercharge.

Reclaim refrigerant, evacuate system, and recharge

(other than normally

 

to nameplate.

satisfying thermostat).

 

 

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

Dirty air ®lter.

Replace ®lter.

continuously.

 

 

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.

Reclaim refrigerant, evacuate system, and recharge.

 

Condenser coil dirty or restricted.

Clean coil or remove restriction.

Compressor makes

Compressor rotating in wrong direction.

Reverse the 3-phase motor power leads as described in

excessive noise.

 

Start-Up on page 17.

Excessive head pressure.

Dirty air ®lter.

Replace ®lter.

 

Dirty condenser coil.

Clean coil.

 

Refrigerant overcharged.

Reclaim excess refrigerant.

 

Air in system.

Reclaim 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.

 

Compressor valves leaking.

Replace compressor.

 

Restriction in liquid tube.

Remove restriction.

 

Compressor rotating in wrong direction

Reverse the 3-phase motor power leads as described in

 

 

Start-Up on page 17.

Excessive suction

High heat load.

Check for source and eliminate.

pressure.

 

 

Compressor valves leaking.

Replace compressor.

 

 

Refrigerant overcharged.

Reclaim excess refrigerant.

 

Compressor rotating in wrong direction.

Reverse the 3-phase motor power leads as described in

 

 

Start-Up on page 17.

Suction pressure too low.

Dirty air ®lter.

Replace ®lter.

 

Low refrigerant charge.

Check for leaks; repair and recharge.

 

Metering device or low side restricted.

Remove source of restriction.

 

Insufficient evaporator air¯ow.

Increase air quantity. Check ®lter and replace

 

 

if necessary.

 

Temperature too low in conditioned area.

Reset thermostat.

 

Outdoor ambient below 25 F.

Install low-ambient kit.

Evaporator fan

Time off delay not ®nished.

Wait for 30-second off delay.

will not shut off.

 

 

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Bryant 581B installation instructions Cooling Service Analysis
Page 33 Page 35

581B specifications

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