How It Works: Water - Scotsman CS60 Service Manual

HOW IT WORKS:
Freezing cycle
The refrigeration process creates cold
temperatures within the evaporator coils and
removes heat from the water sprayed up into
the inverted ice cube cups. When enough heat
is removed, the water changes into ice, and
forms where it is the coldest: in the ice cube
cups.
Minerals contained in the supply water will not
freeze and are drained away. Mostly pure water
will be frozen into the ice cubes.
During the freezing cycle, the compressor, fan
motor, and water pump are operating. Water is
continuously freezing or being sprayed and
recirculated. When evaporator temperature is
lowered to the cold temperature setting of the
cube size control, it ends the freezing cycle and
starts the harvest cycle.
Harvest cycle
The hot gas valve opens and hot
refrigerant gas is discharged into the
evaporator.
The inlet water valve opens and a fresh
supply of water flows to the top of the
evaporator and then drains into the
reservoir.
The ice cubes have been released
from the inverted cube cups in the
evaporator by the warming effect of the
hot refrigerant gas condensing in the
evaporator tubing, plus the incoming
water flowing around the inverted cups.
The released ice cubes drop onto the
spray platform and through the curtain
assembly into the ice storage bin.
WATER
The cube size control thermostat senses the
warmer temperatures of the harvest cycle, and
at a preset temperature, opens the circuit to the
hot gas and inlet water valves. Both valves then
close.
The harvest cycle is complete, and the freezing
cycle restarts.
The automatic ice making process continues
until the bin is full of ice, and the bin thermostat
senses a colder temperature.
The bin thermostat then opens the circuit to all
components and the automatic ice making
process stops.
WATER
SPRAY
WATER
PUMP, ON
DURING
FREEZE
INLET
WATER
VALVE, OPEN
DURING
HARVEST
January 1995
Page 9
CS60
WATER TO
EVAPORATOR
DRAINS