True T-23DT Installation Manual page 15

TRUE
T-23DT
DANFOSS ELECTRONIC TEMPERATURE CONTROLS
DANFOSS ELECTRONIC CONTROL FREEZER WITH DIGITAL DISPLAY
GENERAL SEQUENCE OF OPERATION
1. Cabinet is plugged in.
a. Interior lights will illuminate on glass door models only. If the 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.
b. Cabinet will start in a Defrost Cycle. The duration for defrost will be a minimum of 4 minutes and a maximum of
30 minutes.
c. The Danfoss Control Display will illuminate showing "deF".
2. The Danfoss control is preprogrammed to initiate defrost every 4 hours of compressor run time.
If deemed necessary by the Danfoss control additional defrost may occur at unspecified times.
a. At this time, the compressor and evaporator fan(s) will turn off and the evaporator coil heater and drain tube heater will
be energized. Some cabinets may also change the rotation of the reversing condenser fan motor.
b. Once a preprogrammed temperature of the evaporator coil is reached, or 30 minutes, the Defrost Cycle will terminate
and the 2 minute delay will occur.
c. After the 2 minute delay the compressor will restart.
d. The evaporator fans will remain off for an additional 3 minutes.
e. The Danfoss Control Display will continue to show "deF" for an additional 30 minutes.
3. The Danfoss control will cycle the compressor and 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 Danfoss 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 -6°F/1°C and the Differential is 6°F/4°C
(Set-Point) -6°F + 6 (Differential) = 0°F
(Set-Point) -21.4°C + 3.3 (Differential) = -18.1°C
The compressor will cycle off -6°F/-21.4°C and back on at 0°F/-18.1°C
Or
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