Turbo Air KUCTB2503 Installation & Operation Manual page 16

temperature too Superheat too high
high.)
Room thermostat set too high
Coil iced-up
Defective distributor
Defective distributor
Uneven coil Defective heater
frosting.
Defrost termination set too low
Fin spaced too narrow
Evaporating temperature too low
Ice build up in coil
quickly
Decrease of air volume
Unit cooler capacity is too small
Main switch open
Blown fuses
Defective motor
Fan not operating
Defective timer or defrost thermostat
Unit in defrost cycle
Coil does not get cold enough to reset
thermostat.
Defective heater
Drain line plugged
Ice accumulating in
drain panel
Defective drain line heater
Defective timer or defrost thermostat
Symptoms
Coil temperature not getting above freezing
point during defrost.
Coil not clearing of
Insufficient defrost period
frost during defrost
cycle
Defrost cycle too short
Defective timer or defrost thermostat
Defrost time is too long
Ice accumulating
on ceiling ,around
Not delaying fans after defrost period.
Possible causes
16
Adjust expansion valve.
Adjust thermostat
Manually defrost coil. Check defrost
time, period, controls.
Replace.
Replace
Replace
Adjust defrost termination setting higher
and move defrost thermostat.
Replace coil
Adjust expansion valve
Check fan and clean air filter
Replace unit cooler
Close switch
Replace fuses. Check for short circuits
or overload conditions
Replace motor
Replace defective component
Wait for completion of cycle
Adjust fan delay setting of thermostat.
Replace heater
Clean drain line
Replace heater
Replace defective component.
Solution
Check heater operation
Adjust timer or more defrost cycle
Adjust defrost thermostat or timer for
longer cycle
Replace defective component
Adjust defrost termination thermostat.
Check fan delaying thermostat