10 Part Number: 9291514 04/17
Operation Section 3
ERC112 Temperature Control
V
V
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 “Evaporator Fan Operation” on
page 9.
DEFROST MODE
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.
Operation / Indication
Status Displayed Comments
Normal (°C) Temp. [°C] Unit depends on setting
(parameters in control)
Normal (°F) Temp. [°F]
Show set-point Temp.
Set to Defrost dEF / Temp Depends on setting
(parameters in control
or as chosen by upper
left button)
Sensor 1 defect E01 Air sensor
Sensor 2 defect E02 Coil sensor
High temperature alarm Hi Automatically switching
at 2 sec rate
Low temperature alarm Lo
Line voltage too hight uHi
Line voltage too low uLi
Press upper or lower right button.
• 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.
Press upper left button for 5 seconds.
• Start defrost.
Press lower left button for 5 seconds.
• 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).
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