Addison B Installation, Operation And Maintenance Manual - Page 15
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TROUBLE SHOOTING GUIDES CONTINUED
General Refrigeration Circuit Continued
SYMPTOM
1. Refrigerant undercharge or leak in system.
2. Evaporator plugged with dirt or ice.
3. Improperly adjusted or defective expansion valve.
N. Supply air temperature too high.
4. Defective compressor.
5. High discharge pressure.
6. Airflow is too high.
1. Airflow is too low.
O. Supply air temperature
2. Return air temperature too low.
1. Refrigerant undercharge.
P. Liquid line too hot.
2. High discharge pressure.
Q. Liquid line frosted or wet.
1. Restriction in liquid line.
1. Insufficient evaporator air flow.
R. Suction line frosting.
2. Restriction in suction or liquid line.
3. Malfunctioning or defective expansion valve.
1. Improper wiring.
2. Defective motor.
S. Blower motor not running.
3. Defective thermostat or control circuit.
4. Motor off on overload protector.
Varispeed™ Condenser Head Pressure Control
SYMPTOM
1. Input pressure is below operating range.
2. No 24 volt control voltage
3. No input pressure to control.
4. Bad fan motor.
A. No fan operation.
5. Pressure transducer problem.
B. Fan stops when pressure reaches
1. Control is not wired correctly.
the high end of the operating range.
C. No fan modulation (On-Off
1. Control is not wired correctly.
Operation)
D. Fan starts at full speed.
1. Control is not wired correctly.
1. Control is not wired correctly.
E. Erratic fan operation.
2. Dirty or blocked condenser coil.
F. Fan motor is cycling on thermal over 1. Dirty or blocked condenser coil.
2. Wrong motor for fan speed control application.
14
POSSIBLE CAUSE
POSSIBLE CAUSE
1. No problem, normal operation.
2. Check for 24 V AC at control.
3. Check alignment of capillary fitting. Schrader valve depressor must depress Schrader valve enough to allow
pressure into capillary.
4. Disconnect power. Place a jumper from L1 to M1 and connect power. If fan does not start, motor is bad and
should be replaced.
5. Disconnect 6 pin connector from right side of control. Place a jumper wire between third pin from the top and
bottom pin on the control (not the cable). If fan goes to full speed, check for input pressure. If it has been
determined there is adequate pressure, the transducer is bad and the control must be replaced.
1. See wiring diagrams.
1. See wiring diagrams.
1. See wiring diagrams.
1. Check to see if control voltage (24 V AC) is on same phase as motor.
2. Clean condenser coil.
1. Clean condenser coil.
2. Replace with motor approved for fan speed control application.
1. Check subcooling and check for leaks.
2. Check evaporator, airflow and filter.
3. Check superheat and adjust TXV, check bulb.
4. Check compressor for proper operation.
5. See "high discharge pressure" above.
6. Check external static pressure.
1. Check evaporator coil, filter, check for closed dampers, grills, drive for loose parts, belts,
misalignment, check external static pressure.
2. Check entering air wet bulb conditions.
1. Adjust the charge by subcooling.
2. See "high discharge pressure" above.
1. Restriction upstream of point of frosting.
1. Check airflow, check drive for loose parts, belts, closed dampers.
2. Restriction upstream of point of frosting.
3. Check bulb of TXV.
1. Check wiring diagrams.
2. Check motor and controller.
3. Check control circuit.
4. Allow motor to cool, check amperage.
REMEDY
REMEDY