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Refrigeration Operation
Default temperature setpoint = 36°F (2.2°C) with a 4°F
(2.2°C) Differential
Normal Operation
The microprocessor control board controls the cabinet
temperature based on the input received from the
cabinet temperature thermistor. The thermistor value
is compared to the control board setpoint. When the
reach-in temperature is equal or greater than the
setpoint (plus half the differential) the compressor relay
closes provided the following conditions are satisfi ed:
1. Power has been uninterrupted to the control board
for a 3 minute period.
OR
1. The 3 minute compressor time delay has expired.
The delay period starts after the compressor has
run and then cycles off.
2. The blender motor is off - If the blender motor is
operating the compressor relay closes when the
blender motor stops (provided # 1 above is true).
The compressor relay opens when the reach-in
temperature is less than the setpoint (minus half the
differential).
Evaporator and Condenser Fan Motor Operation
The condenser fan motor and compressor share the
same relay. The evaporator fan motor relay is energized
continuously and the evaporator fan cycles off only
during cleaning cycle.
Operation in the Clean/Sanitize cycle
During the weekly cleaning/sanitize cycle the evaporator
fan motor relay and the condenser fan motor/
compressor relay are de-energized. The relays cannot
energize until the clean/sanitize cycle is complete.
Upon completion of the clean/sanitize cycle the relays
will energize provided the conditions listed in normal
operation are satisfi ed.
Maximum Compressor Run Time
After 180 minutes of cumulative compressor run time,
the compressor will be de-energized for fi fteen (15)
minutes.
High Temp Alarm
High temp alarm will display when product thermistor
is above 42ºF (5.6°C) for 30 minutes and following
conditions are satisfi ed
3 hours since power is applied
1 hour since cleaning cycle
Error display will reset when temperature reaches 41ºF
(5°C) or below.
Thermistor Failure
If the microprocessor control board receives an open
or shorted cabinet thermistor signal the following will
happen:
1. A fault is displayed on the LCD screen sensor
• Cabinet sensor open
OR
• Cabinet sensor shorted
1. The microprocessor will initiate a default sequence
for the refrigeration system - 12 minutes on, 3
minutes off.
2. The default cycle continues until the fault is
corrected or power is disconnected. Refer to
Cabinet Temperature Thermistor for diagnostic
procedures.
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