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Electronic Control
Initiate Diagnostics Mode
The control will enter Diagnostics Mode when both keys
are pressed for 3 seconds while on temperature setting
"4".
Diagnostics Indicator
The control will display the following (in 3-second
intervals):
• "8" (7 segment display test)
• Model ID
• SW version
• Thermistor status
• "C" = short
• "O" = open
• "-" = good
The control will then return to normal operation.
Defrost Timing
The length of the defrost cycle is 30 minutes, this
includes the heater "on" time and dwell time.
Refrigerator:
This will occur after every 8 hours of compressor run
time.
Freezer:
This will occur after every 12 hours of compressor run
time.
Manual Defrost Mode
When pressing both keys for 3 seconds while on setting
"2", the control will enter Manual Defrost mode. The
display will show a "d".
Manual defrost can be cancelled by again holding both
keys for 3 seconds.
Manual Defrost mode will terminate after the defrost
cycle has completed. The control will resume normal
operation on setting "2". The defrost cycle resets the
compressor run time counter to zero.
Showroom Mode
When pressing both keys for 3 seconds while on setting
"0", the control will enter Showroom Mode. The display
will show an "S" for three seconds. Showroom mode
allows control functions to be demonstrated without
having the defrost heater or compressor operational.
Showroom mode is cancelled in the same manner as
initiating it. The display will show a "-" character for one
second followed by an "S" for three seconds.
Compressor Run Time (CRT) Display Mode
When pressing both keys for 3 seconds while on setting
"5", the control will display the current compressor run
time (in seconds) in fi ve digit decimal format. Leading
zeros will be displayed if required. Each digit will be
displayed for three seconds followed by a "-" character
for one second. When all 5 digits have been displayed,
the control will issue two consecutive "-" characters and
resume normal operation on setting "5".
Compressor Delay Start
When the compressor is turned off, it will not start again
for 13 minutes if a freezer, and 4 minutes if a refrigerator.
Memory Retention
Whenever power is restored to the control after a power
loss, the control resumes normal operation under the
setting in which it was in before power was lost. However,
if the setting is changed during fail safe, then the new
setting will not be saved, and the control will resume
operations under the last setting it was on before the
failure occurred. Compressor run time (CRT) is retained
while the control has power applied and is recovered after
a power down/up cycle.
Voltage Range
The control operates normally down to a line voltage of
92 volts. Below this voltage, the compressor is turned
off and an "E" will fl ash on the display at one-second
intervals. Once the voltage rises above 92 volts, the
control resumes normal operation
Stuck Key
If either key is held in for more than 30 seconds, the
control enters fail-safe operation.
Main Power Connector
To test function of defrost heater and compressor:
Connect an AC voltmeter from pin 1 (neutral) to pin 3, 4,
or 5. If line voltage is present, that output is on. If line
voltage is 0V, the output is off.
5
4
3
2
1
3-2
Heater
Compressor
VAC Line
VAC Neutral
- Quick Links:
- Initiate Diagnostics Mode
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