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REFRIGERATION DEFROST CONTROLS g
d
Low Pressure Control Settings
Defrost Timer
MODEL
Discharge
c
Air
Temperature
A pplication
e Used to Control
Temperature
f If Thermostat
Controls Temperature
Defrost
Type
Defrost
Frequency
Failsafe
h
Time
(Minutes)
Saturated
Suction
Temperature
(Cut-out)d
(Cut-in)
d
(Cut-out) (Cut-in)
- 20° F
Low Temp
(Ice Cream)
-35° F -16° F
1-4 psig
-10° F
ELECTRIC
30
50° F
+24° F
MedTemp
(Dairy Deli)
5° F 25° F 10° F 30° F
ELECTRIC
30
50° F
ISCGG
ISFGG/
RGG
ISMGG/
RGG
+24° F
MedTemp
(Dairy Deli)
5° F
25° F
10° F
30° F
OFF
TIME
Every
12 Hours
70
50° F
c
Discharge air temperature is to be measured by attaching a service thermometer to the discharge honeycomb at the centre of the case.
d
Low-pressure control setting values are given as temperature. Convert this temperature to the corresponding refrigerant pressure.
e
When the low-pressure control is used to control refrigeration temperature, set the cutout of the control to stop the compressor at the
discharge air temperature shown above.
f
When a refrigeration thermostat is used to control temperature, set the pressure control as shown then adjust the thermostat to stop
the compressor at the discharge air temperature shown above. For outdoor condensing units, a refrigeration thermostat must control
refrigeration temperature.
g If these spot display refrigerators are to be multiplexed with a different type refrigerator, compare these defrost settings with those
specified for the other refrigerator. If the settings are not compatible, refer to page 17.
h
The defrost timer of outdoor condensing units must control a liquid line solenoid for pump-down prior to defrost only. The failsafe
setting for outdoor units must be increased 4 minutes to compensate for the pump-down period
.
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