Évaluations - 3, GPA: 4
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Facilité d'utilisation
Power off 1 Restore power 2. Fuses blown in field power circuit 2 After finding cause and correcting, replace with correct size fuse. 3. Transformer dead 3 Replace transformer if primary windings are receiving power. 4. Thermostat circuit open 4 Check thermostat setting. 5. Time Guard® II circuit defective 5 Replace Time Guard II circuit. 6. Circuit breaker tripped 6 Check for excessive compressor current draw allowable (140% FLA maximum). 7. Low-pressure switch open 7 Check for refrigerant undercharge, obstruction of indoor airflow, or whether compressor suction shutoff valve is fully open Make sure liquid line solenoid (if used) is open. 8. High-pressure switch open 8 Check for refrigerant overcharge, obstruction of outdoor airflow, air in system, or whether compressor discharge valve is fully open. Be sure outdoor fan(s) is operating 9. Loose electrical connections 9 Tighten all connections. 10. Compressor stuck 10 See 06D compressor service literature. 11. Compressor motor thermostat open 11 Check for excessive motor temperature. Contactor Closed 1. Compressor leads loose 1. Check connections. 2. Motor windings open 2 See 06D compressor service literature. 3. Single phasing 3. Replace blown fuse COMPRESSOR CYCLES ON HIGH-PRESSURE SWITCH Outdoor Fan On 1. High-pressure switch faulty 1 Replace switch. 2. Airflow restricted 2 Remove obstruction. 3. Air recirculating 3. Clear airflow area. 4. Noncondensables in system 4 Purge and recharge as required. 5. Refrigerant overcharge 5. Purge as required 6. Line voltage incorrect 6. Consult power company 7. Refrigerant system restrictions 7. Check or replace filter drier, expansion valve, etc. 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. Filter drier plugged 1. Replace filter drier. 2. Expansion valve power head defective 2. Replace power head. 3. Low refrigerant charge 3 Add charge. Check low-pressure switch setting Airflow Restricted 1. Coil iced up 1. Check refrigerant charge 2. Coil dirty 2. Clean coil fins. 3. Air filters dirty 3. Clean or replace filters. 4. Dampers closed 4 Check damper operation and position. Indoor-Air Fan Stopped 1. Electrical connections loose 1 Tighten all connections. 2. Fan relay defective 2. Replace relay. 3. Motor overload open 3. Power supply 4. Motor defective 4. Replace motor. 5. Fan belt broken or slipping 5. Replace or tighten belt 9 TROUBLESHOOTING (cont) PROBLEM SOLUTION COMPRESSOR RUNNING BUT COOLING INSUFFICIENT Suction Pressure Low 1. Refrigerant charge low 2. Head pressure low 3. Air filters dirty 4. Expansion valve power head defective 5. Indoor coil partially iced 6. Indoor airflow restricted Suction Pressure High 1. Compressor valve defective 2. Head load excessive 1. Add refrigerant 2. Check refrigerant charge. Check outdoor-air fan thermostat settings. 3 Clean or replace filters. 4. Replace power head. 5. Check low-pressure setting. 6. Remove obstruction. 1. See 06D compressor service literature. 2 Check for open doors or windows in vicinity of fan coil. UNIT OPERATES TOO LONG OR CONTINUOUSLY 1. Low refrigerant charge 2. Control contacts fused 3. Air in system 4. Partially plugged expansion valve or filter drier 1. Add refrigerant. 2. Replace control. 3. Purge and evacuate system. 4. Clean or replace. SYSTEM IS NOISY 1. Piping vibration 2. Compressor noisy 1. Support piping as required. 2. Check valve plates for valve noise Replace compressor if bearings are worn COMPRESSOR LOSES OIL 1. Leak in system 2. Crankcase heaters not energized during shutdown 3. Improper interconnecting piping design 1. Repair leak. 2. Check wiring and relays Check heater and replace if defective. 3 Check piping for oil return. Replace if necessary. FROSTED SUCTION LINE 1. Expansion valve admitting excess refrigerant 1. Adjust expansion valve. HOT LIQUID LINE 1. Shortage of refrigerant due to leak 2. Expansion valve opens too wide 1. Repair leak and recharge. 2. Adjust expansion valve. FROSTED LIQUID LINE 1. Restricted filter drier 1. Remove restriction or replace. COMPRESSOR WILL NOT UNLOAD 1. Defective unloader 2. Defective capacity control solenoid valve (if used) 3. Miswired capacity control liquid line solenoid (if used) 4. Weak, broken, or wrong valve body spring 1 Replace unloader. 2 Replace valve. 3 Rewire correctly. 4. Replace spring COMPRESSOR WILL NOT LOAD 1. Miswired capacity control liquid line solenoid (if used) 2. Defective capacity control solenoid valve (if used) 3. Plugged strainer (high side) 4. Stuck or damaged unloader piston or piston ring(s) 1. Rewire correctly. 2. Replace valve. 3 Clean or replace strainer. 4 Clean or replace the necessary parts s...