User Manual for ST School Milk Cooler
Beverage-Air
Rev. 06/20
Beverage-Air
10
SEQUENCE OF OPERATIONS REFRIGERATOR
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
+2
The Compressor
Contact is energized
Compressor turns
off when the air
temperature at probe is
equal to or less than the
set point -2
The Compressor
Contact is de-
energized
(ERC 112 – Terminal #1)
(ERC 112 – Terminal
#1)
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 off when the
Compressor is not
running
The Condenser Fan
is wired directly to
the Compressor, not
through the controller
Condition
Compr
essor
Condenser F
an
Cabinet Temp > Set point + 2
ON
ON
Cabinet Temperature <= Set point - 2
OFF
OFF
