Electronic Temperature Controls Sequence Of Operation - True TDD-3-HC Installation Manual

TRUE
UNDERBAR REFRIGERATION
ELECTRONIC TEMPERATURE CONTROLS
DANFOSS ELECTRONIC TEMPERATURE CONTROL GENERAL SEQUENCE OF OPERATION
control probe = return air
defrost probe = coil
DANFOSS ELECTRONIC CONTROL REFRIGERATOR WITHOUT 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
60 minutes.
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 evaporator fans will continue to run but the compressor will turn off.
Some cabinets may also change the rotation of the reversing condenser fan motor.
b. Once a preprogrammed temperature of the evaporator coil is reached, the Defrost Cycle will terminate and the
2 minute delay will start.
c. After the 2 minute delay the compressor will restart.
3. The Danfoss control will cycle the compressor and the evaporator fan(s) on and off together.
a. The temperature control is sensing the discharge air temperature.
b. The temperature control should be set on the #4 or #5.
c. The warmest setting is #1, the coldest is #9, and #0 is the off position.
d. The thermometer is designed to read and display a cabinet temperature not a product temperature.
This cabinet temperature may reflect the refrigeration cycle determined by the temperature control.
The most accurate temperature on a cabinets operation is to verify the product temperature.
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