How The Electronic Cuber Works
This section is intended for the technician. It is not necessary for the normal operation and maintenance
of the machine.
Refrigeration System:
The refrigeration system is similar to that of most
commercial cube ice machines. Heat is removed
from the water and discharged out the condenser
during the freeze cycle. As liquid refrigerant
passes thru each Thermostatic Expansion Valve, it
enters the bottom of the evaporators, and ice will
form at the bottom first.
When cubes need to be released (Harvest) the Hot
Gas Valve is opened and Hot discharge gas flows
from the compressor through the check valves to
the evaporator inlets. At the same time, a Harvest
Bypass Valve opens for a few seconds to add the
refrigerant needed for harvest. After that the
Harvest Bypass Valve and the closed Discharge
Check Valve keeps the refrigerant in the
condenser out of the Hot Gas Circuit.
This warms up the evaporators and the surface of
the ice frozen to the evaporator surface melts. Ice
then falls into the bin.
The liquid line Check Valve prevents liquid
migration at low ambients during the Off cycle.
CME456R
December 2000
Page 19
Receiver
Evaporator
Evaporator
Compressor
Remote Condenser
Hot Gas
Valve
Check
Valve
TXV
TXV
Check
Valve
Check
Valve
Suction
Discharge Line
Accumulator
Process
Port
Head
Pressure
Control
Valve
Harvest
Bypass
Valve
Heat
Exchange
Refrigeration Schematic
