System Troubleshooting - Turbo Air KUCTB2503 Installation & Operation Manual

evaporator, on fan Defective defrost thermostat or timer.
guard, or blades.
Too many defrosts

System troubleshooting.

symptoms
Main switch open
Blown fuse
Loose wiring
Compressor not
System cable shut down
running
Thermal overload tripped
Defective contactor or contactor coil
System shut down by safety devices.
Liquid line solenoid not open
Flooding of liquid refrigerant into crankcase
Noisy Improper piping support on suction or liquid
Compressor line.
Worn compressor.
Non-condensable in system.
Too much refrigerant
High discharge
Discharge shut off valve partially closed
pressure.
Fan not running
Dirty condenser coil
Faulty condenser temperature controls
Suction shut off valve partially closed
Low discharge
Insufficient refrigerant
pressure.
Low suction pressure
symptoms
High suction Excessive loads
Possible causes
Possible causes
17
Replace defective component
Reduce the number of defrosts
Solution
Close switch
Check electrical circuits and motor
winding for shorts or grounds.
Replace fuse after fault is corrected.
Check all wire junctions. Tighten all
terminal screws.
Replace shutdown cable.
Overloads are automatically
Check unit when unit come back on
line.
Replace or repair
Check cause of shut down
Repair or replace coil
Check expansion valve setting
Relocate add hangers.
Replace compressor
Remove non-condensable.
Remove excess refrigerant
Open valve
Check electrical circuit and fuse.
Clean condenser coil
Check head pressure control
Open valve
Check leaks. Add charge.
See corrective steps for low suction
pressure.
Solution
Reduce load.
reset.