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Section 3
At Start Up
1. At initial start-up or anytime power is disconnected, then
reconnected to the unit, the control will go into defrost
mode.
2. The control will enter a DEFROST mode and the display
will read dEF. The compressor and condenser fan as well
as the evaporator fan will remain off until this initial
defrost is complete. This initial defrost cycle may take up
to 35 minutes to complete.
3. The display will continue to read dEF for an additional 30
minutes while the cooling cycle cools the box to the set
temperature.
4. Then the digital thermostat will display box temperature.
5. The temperature control will cycle the compressor,
evaporator fan motor and condenser fan motor to
maintain box temperature at the control setting. For
more information see Refrigerator Evaporator Fan
Operation on page 14.
Defrost
The temperature control also monitors the evaporator
temperature and will turn off the compressor and condenser
fan motor when needed to allow accumulated frost on the
evaporator to clear. During this defrost cycle, the digital
temperature display will read dEF. After the defrost cycle is
complete, the temperature control will return to a normal
cooling cycle, but the display will continue to read dEF until
the evaporator returns to normal cooling temperatures (up
to 30 minutes).
The electronic temperature controller monitors evaporator
temperature and compressor run time to determine the
proper time for a positive defrost cycle. A defrost cycle
can occur as often as every 60 minutes under extremely
heavy usage. It can last a minimum of 2 minutes. When the
controller enters the defrost mode the compressor is shut
off and will remain off until the evaporator coil temperature
exceeds 41°F (5°C) or the controller reaches a time limit of 75
minutes on a refrigerated unit.
Operation / Indication
Status
Normal (°C)
Normal (°F)
Show set-point
Set to Defrost
Sensor 1 defect
Sensor 2 defect
Part Number: 9291465 06/17
Displayed
Comments
Temp. [°C]
Unit depends on setting
(parameters in control)
Temp. [°F]
Temp.
dEF / Temp
Depends on setting
(parameters in control
or as chosen by upper
left button)
E01
Air sensor
E02
Coil sensor
Operation / Indication
Status
High temperature alarm
Low temperature alarm
Line voltage too hight
Line voltage too low
Control calls for cooling
for more than 24 hours
straight
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• Display show actual set-point (blinking).
• If buttons untouched for 3 seconds returns to
normal.
• Increase set-point by pressing upper button. Max value
depends on parameters in control.
• Decrease set-point by pressing lower button. Min value
depends on parameters in control.
• If buttons untouched for 3 seconds returns to normal
and stores new set-point.
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• Start defrost.
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• Unit goes into stand-by mode.
• The display will read Off, then a period.
• Press the lower left button again for 5 seconds.
• The display will read On.
• The unit will then start up in the defrost mode, and
display will read dEF.
Temperature Alarm
The alarm will flash HI or LO 90 minutes after the unit has
reached its alarm temperature point or after any power
interruption if the temperature is above or below the alarm
set points.
• The high refrigerator temperature point is 50°F (10°C).
• The low refrigerator temperature point is 25°F (-4°C).
Operation
Displayed
Comments
Hi
Automatically switching
at 2 sec rate
Lo
uHi
uLi
Time includes defrost.
LEA
Error will go away if the
control cycles off the
compressor or if the
power is shut off. If error
is on a cold pan it could
be related to a high
ambient temperature or
not shutting the rail off
nightly.
15
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