Loading ...
Loading ...
Loading ...
www.welbilt.com 800-225-9916 31
Polyol Ester (POE) Lubricants (continued):
lubricant because of its particular additives. ICI Emkarate RL 32S is an acceptable
alternative when the Mobil is not available. These POE lubricants must be used with
HFC refrigerants. Lubricants are packaged in specially designed, sealed containers.
Once opened, use the lubricant immediately. Properly dispose of any unused lubricant.
Troubleshooting Charts
Evaporator Troubleshooting Chart:
Problem
Possible Cause
Corrective Action
Fan(s) will not operate.
Main switch open
Close switch
Blown fuse(s)
Replace fuse(s). Check for short
circuits or overload conditions.
Defective motor
Replace motor.
Defective timer or defrost
thermostat
Replace defective component.
Unit in defrost cycle
Wait for completion of cycle.
Walk-in temperature too high.
Thermostat set too high
Adjust thermostat.
Superheat too high
Adjust thermal expansion valve.
System low on refrigerant
Locate and repair leak, recover,
evacuate and recharge.
Coil iced up Manually defrost coil. Check
defrost controls.
Ice accumulating on ceiling
around evaporator and/or on fan
guards, venturi, or blades.
Defrost duration is too long
Adjust defrost termination
thermostat (if adjustable).
Fan delay not delaying fans after
defrost period
Replace defective defrost
thermostat.
Defective defrost thermostat or
timer
Replace defective component.
Too many defrost cycles per day Reduce number of defrost cycles
per day.
Frost on coil after defrost cycle.
Coil temperature not getting
above freezing point during
defrost
Check heater operation
Not enough defrost cycles per
day
Adjust timer for more defrost
cycles per day
Defrost cycle too short Adjust timer for longer cycle,
check defrost thermostat
mounting
Defective timer or defrost
thermostat
Replace defective component.
Ice accumulating in drain pan.
Defective heater
Replace heater.
Unit not pitched properly
Check and adjust.
Drain line plugged
Clean drain line.
Defective drain line heater
Replace heater.
Defective timer or thermostat
Replace defective component.
Loading ...
Loading ...
Loading ...