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9
OPERATIONS MANUAL
MILK COOLERS FORCED AIR & COLD WALL
a. The display will illuminate with the current cabinet
temperature.
NOTE: If the display does not illuminate, make sure
the main power switch on top of the control box is
set to ON (when provided).
b. The compressor icon, fan icon, and the aux heater icon
may flash for a period of time, indicating normal
delayed start-up.
c. After the start-up delay, the compressor and evaporator
fan(s) will start if the control is calling for cooling. The
fan(s) may pulse on and off when the compressor is off to
conserve energy.
IMPORTANT NOTE: All refrigerators are designed with an
automatic, “off-cycle” defrost system. Defrosting occurs
automatically when the compressor is not operating
during an off-cycle. Do not set the thermostat where
the cabinet temperature will fall below 34°F because the
evaporator will become blocked by ice since the com-
pressor off-cycle will be considerably shortened. This
will result in loss of product stored within the cabinet and
require service to defrost the evaporator and re-adjust
the thermostat, which is not covered under warranty.
CAUTION: ON ALL “FORCED AIR” AND “COLD WALL”
MODELS, IT IS STRONGLY RECOMMENDED THAT TOP
LIDS AND DOORS BE KEPT CLOSED WHEN THE UNIT
IS NOT IN USE OR BETWEEN RUSH PERIODS. THIS
IS EXTREMELY IMPORTANT DURING THE SUMMER
MONTHS AND IN HOT KITCHENS. DO NOT KEEP
THE TOP LIDS AND DOORS OPEN FOR PROLONGED
PERIODS OF TIME AND NEVER OPERATE FORCED AIR
MODELS FOR LONGER THAN FOUR HOURS WITH LIDS
AND DOORS OPEN AS EVAPORATOR COIL CAN ICE
AND MAY HAVE TO BE MANUALLY DEFROSTED.
ELECTRONIC CONTROL DISPLAY AND BUTTONS
The control has a 3 button interface.
• The “AUX HTRS/UP” button is used for adjustment of the
auxiliary anti-condensate heaters or for increasing values.
• The “SET/MUTE” button is used to lock in a new value or to
silence the alarm beeper.
• The “DEFROST/DOWN” button is used to activate a manual
defrost or for decreasing values.
The control icons shown above will be illuminated when the
associated function is active. If an icon is flashing, it means the
function will be activated after the controller delays are finished.
NOTE: The electronic control has 3 probes. There is the
regulation probe in the return air stream, there is an
ambient probe, and there is an evaporator probe located
in the evaporator coil.
INITIAL SEQUENCE OF OPERATION
1. Cabinet is plugged in.
2. The control will cycle the compressor on and off determined
by the SET-POINT and DIFFERENTIAL.
3. The control may be preprogrammed to initiate a defrost by
time interval.
HOW TO CALIBRATE THE ELECTRONIC CONTROL
The controller temperature display can be calibrated if required.
Before attempting to calibrate the temperature display, check the
display by placing a pre-calibrated temperature sensing device in
the center of the refrigerated compartment and keep the doors
closed for at least 15 minutes. The temperature display should
read the same temperature as the sensing device, within +/-2°F.
If not, follow these instructions to calibrate.
1. Press and HOLD the “SET” button until “PS” appears flash-
ing in the display. Release the “SET” button.
COMPRESSOR
EVAP FAN
DEFROST
AUX HTRS
ALARM
AUX HTRS
(UP)
SET
(MUTE)
DEFROST
(DOWN)
a. The SET-POINT is the preprogrammed temperature which
shuts off the compressor.
b. The DIFFERENTIAL is the preprogrammed temperature that
is added to the SET POINT temperature that will start the
compressor.
EXAMPLE: Set-Point 36°F and the differential is 4°F the com-
pressor will cycle off at 36°F and back on at 40°F.
a. During defrost, the defrost icon will appear in the display
and the compressor will turn off until a preprogrammed
temperature or time is reached. During this time for freez-
ers only, the evaporator fan(s) will also turn off and the
defrost heater will be energized.
b. After a preprogrammed evaporator temperature has been
reached, there may be a short delay for both the compres-
sor and evaporator fan(s) to restart.
c. After the defrost cycle is completed, the control will
resume normal operation.
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