Scotsman CME650R - Manual (Page 18)

HARVEST CYCLE - HOT GAS BYPASS
When the timer switches the icemaker into the
harvest cycle, high pressure, high temperature
refrigerant gas discharged from the compressor
flows through the hot gas solenoid valve into each
evaporator plate. During this cycle, the refrigerant
bypasses the condenser. In the electrical circuit,
both the compressor and the water pump are
operating. Both the hot gas solenoid valve and the
water inlet solenoid valve are OPEN.
The finished ice cubes are released from the sides
of each evaporator plate by the warming effect of
the hot gas condensing in each evaporator plate
and the water cascading over the ice cubes. The
released ice cubes drop into the ice storage bin
below. At the end of the harvest cycle, the timer
cam will push the actuator arm to the microswitch
IN. If the ice level control is still CLOSED, a whole
new cycle will begin. If the ice level control is
OPEN, the icemaker will begin to shut OFF.
Pump Down Cycle:
When the ice level control is open at the end of the
harvest cycle, power is removed from the liquid
line valve coil, and the pump down cycle begins.
The compressor will continue to run until the pump
down control, sensing low side pressure, opens at
15 PSIG.
Fan
Motor
Discharge
Line
Discharge
Coil
Heat
Exchange
Filter
Hot Gas
Valve
(Open)
Suction
Line
Liquid
Line Valve
TXV
Pump
Water
Valve
(Open)
Drain
Filter/Dryer
Receiver
Head
Pressure
Control
Valve
Liquid
Line
King
Valve
Evaporators
REFRIGERATION SCHEMATIC
Compressor
Crankcase
Heater
CME650R
March 1994
Page 18