Harvest Cycle Sequence Of Operation - Scotsman EH222 Quick Start Manual

EH222 and Condensing Unit
Remote Low Side Cuber Service Manual

Harvest Cycle Sequence of Operation

When harvest begins, the controller connects
power to the Harvest relay for the condensing unit's
solenoids.
Harvest Relay
It also connects power to the vapor inlet solenoid
valve in the cabinet of the EH222.
The vapor inlet solenoid valve and the condenser
bypass valve open. The receiver inlet solenoid valve
closes. Vapor flows from the condensing unit to the
EH222 evaporator inlet.
The water pump and purge valve will be on for a
period of time during the first part of harvest to purge
the water reservoir of a portion of the water.
The inlet water solenoid valve opens to fill the
reservoir when the water level sensor indicates an
empty sump. It continues to fill when the pump and
purge valve have shut off and will stop filling when the
water level sensor senses a full sump.
Harvest will continue until both curtains have opened.
The curtain switch, attached to the edge of each
curtain, will sense the curtain opening.
If the curtains both close, harvest will terminate and
the freeze cycle will resume.
If the curtain remains open for 30 seconds, the
machine will shut down
EH222 Relay Box (left side of unit)
Contactor Relay
August 2013
Page 36