Bryant 566D Installation, Start-Up And Service Instructions

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TROUBLESHOOTING
PROBLEM SOLUTION
COMPRESSOR DOES NOT RUN
Contactor Open
1. Power off. 1. Restore power.
2. Fuses blown in field power circuit. 2. After finding cause and correcting, replace with correct size fuse.
3. No control power. 3. Check control circuit breaker; reset if tripped or replace if defective.
4. Thermostat circuit open. 4. Check thermostat setting.
5. Time Guard II device not operating (566D only). 5. Check Time Guard II device.
6. Compressor circuit breaker tripped (566D only). 6. Check for excessive compressor current draw. Reset breaker;
replace if defective.
7. Safety device lockout circuit active. 7. Reset lockout circuit at thermostat or circuit breaker.
8. Low-pressure switch open. 8. Check for refrigerant undercharge, obstruction of indoor airflow, or
whether compressor suction shutoff valve is fully open. Make sure
liquid line solenoid valve(s) is open.
9. High-pressure switch open. 9. Check for refrigerant overcharge, obstruction of outdoor airflow, air in
system, or whether compressor discharge valve is fully open. Be
sure outdoor fans are operating correctly.
10. Compressor overtemperature switch open. 10. Check for open condition. Allow for reset. Replace if defective.
11. Loose electrical connections. 11. Tighten all connections.
12. Compressor stuck. 12. See compressor service literature.
Contactor Closed
1. Compressor leads loose. 1. Check connections.
2. Motor windings open. 2. See compressor service literature.
3. Single phasing. 3. Check for blown fuse. Check for loose connection at compressor
terminal.
COMPRESSOR STOPS ON HIGH-PRESSURE SWITCH
Outdoor Fan On
1. High-pressure switch faulty. 1. Replace switch.
2. Reversed fan rotation. 2. Confirm rotation, correct if necessary.
3. Airflow restricted. 3. Remove obstruction.
4. Air recirculating. 4. Clear airflow area.
5. Noncondensables in system. 5. Recover refrigerant and recharge as required.
6. Refrigerant overcharge. 6. Recover refrigerant as required.
7. Line voltage incorrect. 7. Consult power company.
8. Refrigerant system restrictions. 8. Check or replace filter drier, expansion valve, etc. Check that com-
pressor discharge service valve is fully open.
Outdoor Fan Off
1. Fan slips on shaft. 1. Tighten fan hub setscrews.
2. Motor not running. 2. Check power and capacitor.
3. Motor bearings stuck. 3. Replace bearings.
4. Motor overload open. 4. Check overload rating. Check for fan blade obstruction.
5. Motor burned out. 5. Replace motor.
COMPRESSOR CYCLES ON LOW-PRESSURE SWITCH
Indoor-Air Fan Running
1. Compressor suction service valve partially closed. 1. Open valve fully.
2. Liquid line solenoid valve(s) fails to open. 2. Check liquid line solenoid valve(s) for proper operation. Replace if
necessary.
3. Filter drier plugged. 3. Replace filter drier.
4. Expansion valve power head defective. 4. Replace power head.
5. Low refrigerant charge. 5. Add charge. Check low-pressure switch setting.

Bryant 566D Specifications

General

Brand	Bryant
Model	566D
Category	Air Conditioner
Language	English