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TAC-27K / TAC-27K-HC-LD: AIR CURTAIN
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ELECTRONIC TEMPERATURE CONTROLS
p1 = supply air (thermostat)
p2 = coil / copper line (defrost)
p3 = return air (display)
p3 probe is not installed and / or activated
in all applications with p3 is not installed
and / or activated, the display probe is p1.
DIXELL ELECTRONIC TEMPERATURE CONTROL GENERAL SEQUENCE OF OPERATION
DIXELL ELECTRONIC CONTROL GENERAL SEQUENCE OF OPERATION
1. Cabinet is plugged in.
a. Display will illuminate.
b. Interior lights will illuminate on Glass Door Models only. If lights do not come on verify the light switch is in the “ON”
position. Solid door cabinets may or may not have lights that may be controlled by the door switch.
c. Evaporator motors will come on (refrigerator only).
2. After the Dixell control preprogrammed time delay of 3-5 minutes, the compressorand freezer evaporator fan(s) will start if
the control is calling for cooling.
3. The Dixell control will cycle the compressor but may also cycle the evaporator fan(s) on and off determined
by the Set-Point and Differential temperatures.
a. The Set-Point is the
adjustable
preprogrammed temperature which shuts off the compressor and evaporator fan(s). This
is not the programmed cabinet temperature.
b. The Differential is the
non adjustable
preprogrammed temperature that is added to the Set-Point temperature that will
start the compressor and evaporator fan(s).
c. The Dixell control is designed to read and display a cabinet temperature
not a product temperature.
This cabinet temperature may reflect the refrigeration cycle of the Set-Point and it’s Differential.
The most accurate temperature on a cabinets operation is to verify the product temperature.
Example: If the Set-Point is 33°F/1°C and the Differential is 8°F/4°C
(Set-Point) 33°F + 8 (Differential) = 41°F
Or
(Set-Point) 1°C + 4 (Differential) = 5°C
The compressor will cycle off 33°F/1°C and back on at 41°F/5°C
4. The Dixell control may be preprogrammed to initiate defrost at specific intervals that start when the cabinet is
plugged in.
a. At this time the “dEF” may appear on the display and compressor will turn off until a preprogrammed temperature or
duration is reached. During this time, for freezers only, evaporator fan(s) will also turn off and the coil heater and drain
tube heaters will also be energized. Some cabinets may also change the rotation of the reversing condenser
fan motor.
b. After the preprogrammed temperature has been reached or duration for defrost has expired, there may be a short delay
for both the compressor and evaporator fans to restart. At this time “dEF” may still appear on the display for a short
time.
