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True Food Service Equipment, Inc.
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1. Cabinet is plugged in.
a. Display will illuminate showing “deF”.
b. Cabinet will start in a Defrost Cycle.
2. During the initial Defrost Cycle, the evaporator fan(s) will run but the compressor will remain off for a minimum
of 4 minutes.
a. After the Defrost Cycle there will be a 2 minute delay and the evaporator fan(s) will stop.
b. After the 2 minute delay the compressor will start, and evaporator fan(s) will delay 60 seconds.
c. The display will continue to show “deF” for an additional 30 minutes.
3. The electronic control will cycle the compressor and the evaporator fan(s) on and off determined by the
Set-Point and Differential temperatures (Set-Point is adjustable).
a. The Set-Point is the preprogrammed temperature which shuts off the compressor and evaporator fan(s).
b. The Differential is the 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. This cabinet temperature may
reflect the refrigeration cycle of the Set-Point and it’s Differential.
Example: If the Set-Point is 34°F/1.1°C and the Differential is 6°F/3.3°C
(Set-Point) 34°F + 6 (Differential) = 40°F
Or
(Set-Point) 1.1°C + 3.3 (Differential) = 4.4°C
The compressor will cycle off 34°F/1.1°C and back on at 40°F/4.4°C
4. The electronic control is preprogrammed to initiate defrost every 4 hours of compressor run time
(non-adjustable).
a. At this time the evaporator fans will continue to run but the compressor will turn off.
b. Once a preprogrammed temperature of the evaporator coil is reached, the Defrost Cycle will terminate and the
2 minute delay will start stopping the evaporator fan(s).
c. After the 2 minute delay the compressor will restart, and evaporator fan(s) will delay 60 seconds.
d. The display will continue to show “deF” for an additional 30 minutes.
TRUE Manufacturing recommends that only the Set-Point may be adjusted due to certain conditions.
DANFOSS TEMPERATURE CONTROL
(REFRIGERATOR SEQUENCE OF OPERATION)