May 2008
Page 20
CU1526, CU2026, CU3030
Service Manual
Electrical Component Details
Compressor
•
Operated by the compressor contactor. Uses PTCR and run capacitor.
Contactor
•
Operated by the controller and the high pressure cut out switch. Line voltage coil. When energized
the Compressor indicator light will be ON.
Water Pump
•
Operated by the controller. When energized, the Water Pump indicator light will be ON.
Purge Valve
•
Operated by the controller. Line voltage coil. When energized, the Purge Valve indicator light will
be ON. Energized for a time during harvest.
Fan Motor(s)
•
Operated by the controller and the fan pressure control. Can cycle on and off in the freeze cycle,
always off during harvest. When the controller has energized it, the indicator light will be ON but
the fan will not turn unless the discharge pressure is high enough to close the high pressure
control.
•
Fan(s) may shut off near the end of the freeze cycle to build up heat for harvest. Time of shut off
depends upon available heat, as measured by the discharge temperature.
High pressure cut out
•
All models have a high pressure cut out switch that shuts the power off to the compressor
contactor if the discharge pressure is too high. It is an automatic reset.
Harvest Assist Solenoid
•
Operated by the controller in parallel with the hot gas valve. Cycles on and off at the beginning of a
restart. Energized throughout the harvest cycle. Line voltage coil.
