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Note:
1) Cut-on, cut-off, and cabinet temperature are read by the same sensor, called the
"cabinet thermistor."
) The defrost thermistor reads the evaporator temperature.
3) There is a ve second evaporator fan startup delay when the compressor and
fan would otherwise start together.
B. Sequence of Operation and Timing Charts
For details on operating modes, see "II.D.4. Operating Modes."
1. Refrigerators – Continuous Operating Mode
a) Sequence of Operation
Five minutes after
defrost heater off
1. Compressor on
. Condenser fan on
Five minutes after
compressor start-up
1. Evaporator fan(s) on
. Frame heater(s) on
(Q6 and later)
One minute after evaporator
fan start-up "dF" no
longer displayed, cabinet
temperature displayed
Board Self Check
1. Frame heater(s) on
. Evaporator fan(s) on
POWER ON
2-minute Delay
1. Compressor start-up
. Condenser fan start-up
Cycle Off (Cut-out
temperature reached)
[Minimum minutes]
1. Compressor off
. Condenser fan off
Continue as
normal cycling
Cycle On (Cut-on
temperature reached)
[Minimum minutes]
1. Compressor start-up
. Condenser fan start-up
Defrost End
Defrost thermistor
reaches defrost
termination temperature,
or defrost timer reaches
1 hour
Defrost heater off
Defrost Start
Preprogrammed time interval
1. Compressor off
. Evaporator fan(s) off
3. Frame heater(s) off (Q6 and later)
4. Condenser fan off
5. Defrost heater on
6. "dF" displayed