Addison DC Series Panduan Pemasangan, Pengoperasian, dan Pemeliharaan - Halaman 14
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TROUBLE SHOOTING GUIDES CONTINUED
General Refrigeration Circuit
SYMPTOM
G.Noisy unit operation.
H.High suction pressure.
I.High discharge pressure.
J.Suction pressure too low.
K.Head pressure too low.
L.Compressor short cycles.
M.Running cycle too long or unit
operates continuously.
Continued
POSSIBLE CAUSE
1.Blower rotational noise.
2.Air noise.
3.Chattering contactor.
4.Tubing rattle.
1.Excessive load on evaporator coil.
2.Broken compressor valves (Scroll compressors do not
have valves.)
3.Compressor is unloaded.
4.Leaking check valve.
5.Expansion valve not secured to suction line or TXV
defective.
1.TXV setting.
2.Air inlet to condenser dirty or obstructed.
3.Condenser fan motor defective.
4.Condenser fan control has incorrect setting.
1.Refrigerant undercharge.
2.Blower running backward.
3.Loose blower, pulley or belts.
4.Defective or improperly adjusted expansion valve.
5.Dirty filter.
6.Too little air flow or low entering air temperature.
7.Restriction in suction or liquid line.
1.Insufficient refrigerant charge.
2.Defective or improperly adjusted expansion valve.
3.Low suction pressure.
4.Condenser fan control setting.
5.Defective compressor.
1.Thermostat location or malfunction.
2.Improper refrigerant charge.
3.Defective high or low pressure control.
4.Liquid floodback.
5.Defective expansion valve.
6.Poor air distribution.
7.High discharge pressure.
8.Leaking discharge valves in compressor.
1.Refrigeration undercharged.
2.Dirty filter or evaporator coil.
3Dirty or clogged condenser coil.
4.Air or other non-condensables in system.
5.Defective compressor.
6.Restriction in suction and liquid line.
7.Control contacts stuck.
1. Check blower, motor and drive for faulty adjustment or noisy bearings, loose parts, blower out of
balance.
2. Check ductwork. Air velocity too high.
3. Check for adequate control voltage, check for shorts or breaks, check thermostat, check contact
points.
4. Dampen by taping or clamping, bend tubing away from contact when possible.
1. Check for high entering wet bulb temperature. Check for excessive airflow.
2. Remove head (semi-herm.) inspect reeds. Scroll compressors should not be pumped down below 5
psig.
3. Check head pressure, check and adjust TXV if not functioning properly, check pressure drop across
filter drier. Re-calibrate unloader pressure switch.
4. Check temperature across check valve.
5. Check the TXV, ensure bulb is insulated.
1. Check TXV setting and calibrate superheat.
2. Check for proper clearances and possible air recirculating.
3. Check condenser fan motor and run capacitor.
4. Check calibration of low ambient head pressure control.
1. Check pressures and subcooling.
2. Interchange any two wires from 3 phase disconnect.
3. Check drive pulley alignment, belt tension.
4. Check superheat and adjust TXV.
5. Check filter and evaporator coil.
6. Check airflow and entering air wet bulb conditions.
7. Check refrigerant circuit for restriction
1. Check subcooling, check for leak.
2. Check sub cooling and adjust TXV.
3. See "suction pressure too low" above.
4. Check calibration of low ambient control.
5. See "high suction pressure" above.
1. Check thermostat, check heat anticipator setting.
2. Check subcooling, verify superheat.
3. Check high or low pressure switch.
4. Possible tight bearings.
5. Check TXV and superheat.
6. Check ductwork for recirculating.
7. See "high discharge pressure" above.
8. See "high suction pressure" above.
1. Check subcooling.
2. Check filter, coil and airflow.
3. Check coil and airflow.
4. Check equalized high side pressure with equivalent outdoor temperature.
5. Check compressor for proper operation.
6. Check for restrictions in refrigerant circuit.
7. Check thermostat, shorts in wiring, slave relay compressor contactor
REMEDY
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