User Manual

User Manual for DP & DPD Beverage-Air
Rev. 04/22 Beverage-Air 17
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
+ 4
The Compressor Contact
is energized
Compressor turns
off when the air
temperature at
probe is equal to
or less than the
set point
The Compressor Contact
is de-energized
(EW+978 - Terminal
#1)
(EW+978 - Terminal #1)
CONDENSER FAN
The Condenser
Fan turns on when
the Compressor is
running
The Condenser Fan is
wired directly to the
Compressor, not throu
g
h
the controller
The Condenser Fan
turns off when the
Compressor is not
running
The Condenser Fan is
wired directly to the
Compressor, not throu
g
h
the controller
EVAP FAN
The Evaporator
Fan turns on when
the unit is
powered on.
The Evaporator Fan is
wired to constant power
The Evaporator Fan
turns off when the
unit is unplugged
or put into standby.
The Evaporator Fan is
wired to constant power
Some models will be
wired to the fan relay
(EW+978 - Terminal
#3)
Some models will be
wired to the fan relay
(EW+978 - Terminal
#3)
LIGHT
The light will turn on
when the down
button is
pressed (or when the
door is opened with
solid doors)
The Light Contact is
energized
The light will turn
off when the down
button is
pressed (or when the
door is closed with
solid doors)
The Light Contact is de-
energized
(Ew+978 – Terminal #2) (Ew+978 – Terminal #2)
Condition
Compressor Condenser Fan Evaporator Fan Lights
Cabinet Temp > Set point + 4 ON ON ON ON or OFF
Cabinet Temperature <= Set point - 4 OFF OFF ON ON or OFF
Defrost OFF OFF ON ON or OFF