System Operation:
This section is intended for the technician.
Understanding it is not necessary for the normal
operation and maintenance of this ice making
system.
Major Components:
Ice making section sub-system:
·
Controller,
·
Ice Sensors,
·
Water Level Sensor,
·
Transformer,
·
Evaporators,
·
Expansion Valves,
·
Check Valves,
·
Vapor Inlet Valve,
·
Water Pump,
·
Inlet Water Valve
·
Purge Valve.
Compressor Package sub-system:
·
Compressor,
·
Contactor,
·
Condenser Bypass Valve,
·
Liquid Inlet Valve,
·
Receiver,
·
Accumulator,
·
CPR Valve,
·
Headmaster.
Condenser sub-system:
·
Coils
·
Fan Motor
The controller receives input from the water level
sensor, ice sensor and temperature sensor. It then
actuates various loads in the ice making section
and in the condensing unit to control ice making. It
also responds to push button input and displays
cycle and diagnostic indicators.
Freeze:
At the ice making sub system, the
controller fills the water reservoir and starts the
pump and compressor to make ice. The vapor inlet
valve is closed. Water circulates over the
evaporators until it begins to freeze to the
evaporators. As ice builds up the water level in the
reservoir falls until it reaches a point where the
water level sensor indicates to the controller that
the water level is low. At that point, about half-way
through the freeze cycle, the controller opens the
water valve to refill the reservoir. The second time
the water level drops in the freeze cycle indicates
to the controller that the freeze cycle is complete.
In the condensing unit sub-system (compressor
package and condenser) the compressor is on, the
condenser by-pass valve is closed, the fan motor is
rotating the fan blade.
Harvest:
At the ice making sub system, the
controller shuts off the pump, opens the vapor inlet
valve, opens the purge valve. The controller also
controls items in the condensing unit, where the
condenser by pass valve is opened. After a set
time the water pump restarts and shortly after that
the purge valve closes. The inlet water valve opens
to add water to the reservoir.
Ice releases and falls into the bin or dispenser.
Eclipse
ä
600, 800, 1000
April 2002
Page 30
Normal Bin Full
Ice
Sensors
