Hoshizaki HUF40A, Service Manual

Page: 15 / 64

15
2. Freezers – Continuous Operating Mode
a) Sequence of Operation
Note:
1) Cut-on, cut-off, and cabinet temperature are read by the same sensor, called the
"cabinet thermistor."
2) The defrost thermistor reads the evaporator temperature.
3) There is a five second evaporator fan startup delay when the compressor and
fan would otherwise start together.
Five minutes after
defrost heater off
1. Compressor on
2. Condenser fan on
Five minutes after
compressor start-up
1. Evaporator fan(s) on Eight minutes after evaporator
fan start-up "dF" no longer
displayed, cabinet temperature
displayed
Board Self Check
1. Frame heater(s) on
2. Evaporator fan(s) on
POWER ON
2 minute delay
1. Compressor start-up
2. Condenser fan start-up
Cycle Off (Cut-out
temperature reached)
[Minimum 2 minutes]
1. Compressor off
2. Condenser fan off
Continue as
normal cycling
Cycle On (Cut-on
temperature reached)
[Minimum 2 minutes]
1. Compressor start-up
2. 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
2. Evaporator fan(s) off
3. Condenser fan off
4. Defrost heater on
5. "dF" displayed