Unit Cooler Troubleshooting - Turbo Air ADR042 Installation & Operation Manual

Unit Cooler troubleshooting.

Symptoms
Insufficient refrigerant
Too much oil in unit cooler
Cooling is
insufficient.
Superheat too high
(Room
Room thermostat set too high
temperature too
high.)
Coil iced-up
Defective distributor
Defective distributor
Defective heater
Uneven coil
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
Defective
operating
thermostat
Unit in defrost cycle
Coil does not get cold enough to
reset thermostat.
Defective heater
Drain line plugged
Ice accumulating
Defective drain line heater
in drain panel
Defective
thermostat
Possible causes
timer or defrost
timer or defrost
18
Solution
Add refrigerant
Check the easy oil return in
suction line.
Adjust expansion valve.
Adjust thermostat
Manually defrost
defrost time, period, controls.
Replace.
Replace
Replace
Adjust defrost termination setting
higher and move
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
thermostat.
Replace heater
Clean drain line
Replace heater
Replace defective component.
coil. Check
defrost
setting of