Component Description - Scotsman MCM1462 Service Manual

MCM1462

COMPONENT DESCRIPTION

Cube Size Control
This reverse acting thermostat controls the length
of the freezing cycle. It is sensing the temperature
of the suction line. When the suction line gets cold
enough, the cube size control closes (on
temperature fall) and starts the timer. A change in
either ambient air or incoming water temperature
will affect the efficiency of the refrigeration system,
and this will vary the length of time it takes the
evaporator to reach the temperature at which the
cube size control is preset to close. See CUBE
SIZE ADJUSTMENT BEFORE attempting to
adJust the control.
Relay
The multi-function, three pole, double throw,
plug-in relay is inserted into a receptacle on the
printed circuit board in the control box. The relay
functions in part to by-pass the bin thermostat
control to prevent the icemaker from shutting OFF,
when the bin thermostat opens during the freezing
cycle. The bypass action ensures full-sized ice
cubes with each harvest cycle and prevents short
cycling on the bin thermostat control.
CONTROL BOX
Timer - Timer & Switch Assembly
The timer cam is controlled by the cube size
control. The outer surface, or large diameter lobe
of the timer cam, determines the timer cycle for
finish freezing of the ice cubes, while the inner
surface, or small diameter lobe, determines the
time cycle for the harvest cycle.
When the microswitch button is pushed in there is
power connected to the coil of the relay, and the
unit is in the freeze cycle. When the microswitch
button is released, the power to the relay is
stopped, and the unit goes into harvest. The
microswitch is actuated by a cam assembly
directly connected to the timer motor.
One complete rotation of the cam will take eight
minutes. Harvest is preset at three and one half
minutes, but is adjustable.
High Pressure Safety Control
This is a manual reset control that shuts down the
icemaker, should the discharge pressure ever
reach 450 PSIG (air cooled) or 350 PSIG (water
cooled). Found below the control box.
ICE/OFF/WASH
SWITCH
BIN ICE LEVEL
SELECTOR SWITCH
April, 1993
Page 12
CUBE SIZE
CONTROL
RELAY
TIMER AND
MICROSWITCH