Owners Manual

User Manual for DD Refrigerators Beverage-Air
Rev. 12/20Beverage-Air18
SEQUENCE OF OPERATIONS DD24HC
The refrigerator operates based on the air temperature measured by the probe located at the return air.
ON OFF
COMPONENT OPERATION CONTROLLER ACTION OPERATION CONTROLLER ACTION
COMPRESSOR
Compressor turns
on when the air
temperature at the
probe is above the
sum of the set point
The Compressor
Contact is energized
Compressor turns
o when the air
temperature at probe is
equal to or less than the
set point
The Compressor
Contact is de-
energized
(502-519D – Terminal
#4)
(502-519D – Terminal
#4)
CONDENSER FAN
The Condenser Fan
turns on when
the Compressor is
running
The Condenser Fan
is wired directly to
the Compressor, not
through the controller
The Condenser Fan
turns o when the
Compressor is not
running
The Condenser Fan
is wired directly to
the Compressor, not
through the controller
EVAPORATOR
FAN
The Evaporator Fan
runs continuously.
When the unit is
plugged in, the
Evaporator Fan will
run.
The Evaporator Fan is
connected directly to
incoming power, not
through the controller.
The Evaporator Fan runs
continuously. When the
unit is plugged in, The
Evaporator Fan will run.
The Evaporator Fan is
connected directly to
incoming power, not
through the controller.
Condition
Compressor Condenser Fan Evaporator Fan
Cabinet Temp > Set point + 2 ON ON ON
Cabinet Temperature <= Set point - 2 OFF OFF ON
Defrost OFF OFF ON