Component Description - Scotsman SCE170 User Manual

Component Description

Water Pump
During the freeze cycle, the water pump moves the
water from the reservoir to the water distributor at
the top of the evaporator. During the harvest
cycle, the water pump moves water from the
reservoir to the purge valve and down the drain.
Float
The float valve controls the water flow into the
reservoir. When the water level drops in the
reservoir, the float also drops and opens the valve.
Note: water flow to this ice machine is controlled
by a flow control within the float valve.
Shut Off Valve
There is a water shut off valve located just above
the float valve. Pushing the valve button controls
the water flow to the float valve.
Reservoir
The place where the water pump picks up water to
pump, and a return trough for water flowing from
the evaporator.
Curtain
There is a curtain to cover the ice making side of
the evaporator. The curtain keeps water from
flowing into the ice storage bin, and, through the
curtain sensor, controls the harvest time and on/off
operation of the ice machine. There are two
indicator lights for the curtain on the control board.
Both lights will be ON when the curtain is fully
closed.
Note: If the unit is in the Freeze Cycle, the Curtain
can be moved/removed without disturbing the
operation of the machine.
Water Distributor
The water distributor is an assembly of two tubes
(one inside the other) that evenly distributes water
over the evaporator.
Purge Valve
The purge valve opens during the harvest cycle,
allowing the water pump to pump reservoir water
down the drain. This dilutes the reservoir's
concentration of minerals that remain after water is
made into ice.
High Pressure Cut Out
This is a switch that opens to stop the ice machine
when the internal refrigeration pressures become
too high (over 450 PSIG). It is a manual reset on
all water cooled machines and all air cooled
machines built prior to October 1998, after that the
air cooled models use an automatic reset switch.
ON/OFF/CLEAN Switch
This switch is the main manual control for the ice
machine.
Purge Switch
This switch operates the purge valve ONLY when
the ON/OFF/CLEAN switch is in the Clean
position. Used when cleaning the ice machine.
Manual Harvest Switch
This switch puts the machine into the harvest
cycle, used when cleaning or servicing the
machine.
Cube Size Control
The cube size control is a reverse-acting
thermostat the controls the start of the timed
freeze cycle. It must be set properly to provide the
correct size cube bridge. When it is Closed, an
indicator light on the control board will be ON.
Strainer
There is a strainer in the inlet water line to keep
large particles that may be in the water supply
from plugging up the float valve. The strainer may
be cleaned if it becomes restricted.
Hot Gas Valve
The hot gas valve is a refrigeration component
used to by-pass the condenser and force warm
refrigerant into the evaporator during the harvest
cycle.
Evaporator
Where the ice is formed. It is a vertical, 5 row by
26 column, all copper, nickel-plated evaporator.
The outside edges of the evaporator are enclosed
in plastic to keep water out.
Thermostatic Expansion Valve
The thermostatic expansion valve is used to meter
liquid refrigerant into the evaporator, adjusting the
flow of refrigerant as required to make ice.
October 1998
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SCE170