11
Short Cycle Protection
The control will not schedule a compressor run (ON) time shorter than five minutes. The control will not schedule a
compressor OFF time shorter than thirty seconds except for loss of power situations.
The operator can stop or start the compressor at any time.
Program Carryover
Time will be retained for a minimum of 100 hours; program retention is indefinite.
During loss of power, the display will be blank, the indicating lights are off and the relay(s) is/are
de-energized. When power is restored (less than 100 hours), the time and program will pick up where
the program is as if there had been no loss of power.
NOTE: After 100 hours, if the clock is lost the time is set to noon, and the program resumes.
Troubleshooting
Problem
Solution
Backlight is not on.
The display backlight will turn on when the ADJUST knob
is turned and will remain on for 10 seconds after the last
activity.
The display segments and backlight are not on.
1. Verify proper voltage is applied to the correct
terminals.
2. Perform PROGRAM RESET.
3. Replace timer.
All the display segments and LEDs are flashing.
The control has detected a catastrophic or
programming failure. If possible the UDT will return to
refrigerate.
1. Verify proper voltage is applied to the correct
terminals.
2. Verify wiring of the device.
3. Perform PROGRAM RESET.
4. If problem clears, reprogram the device.
5. If indication remains, replace the timer.
The display is flashing a
G during normal operation.
Indicates a shorted defrost termination switch on
Terminal G. The control will default to its timed
termination point.
1. Verify wiring of defrost termination switch.
2. Verify switch operation, and replace defrost
termination switch if necessary.
3. Once the defrost termination switch is operating
normally, the flashing G will reset automatically.
(This may take one defrost cycle to reset.)
