Freezers - Continuous Operating Mode - Hoshizaki HUR40A(-D) Service Manual

2. Freezers – Continuous Operating Mode
a) Sequence of Operation
POWER ON
Board Self Check
1. Frame heater(s) on
2. Evaporator fan(s) on
Cycle On (Cut-on
temperature reached)
[Minimum 2 minutes]
1. Compressor start-up
2. Condenser fan start-up
Continue as
normal cycling
Five minutes after
defrost heater off
1. Compressor on
2. Condenser fan on
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.
2 minute delay
1. Compressor start-up
2. Condenser fan start-up
Defrost Start
Preprogrammed time interval
1. Compressor off
2. Evaporator fan(s) off
3. Condenser fan off
4. Defrost heater on
5. "dF" displayed
Five minutes after
compressor start-up
1. Evaporator fan(s) on
15
Cycle Off (Cut-out
temperature reached)
[Minimum 2 minutes]
1. Compressor off
2. Condenser fan off
Defrost end
Defrost thermistor
reaches defrost
termination
temperature, or defrost
timer reaches 1 hour
Defrost heater off
Eight minutes after evaporator
fan start-up "dF" no longer
displayed, cabinet temperature
displayed