Scotsman NM650 Service Manual page 11

COMPONENT DESCRIPTION: Control Box
Contactor: A definite purpose contactor
connecting the compressor and the remote
condenser fan motor to the power supply.
Circuit Board: Controlling the ice machine
through sensors and relays. The sensors are
for ice level and water level. The relays are for
the gear motor (with a built in time delay to
clear the evaporator of ice when the unit turns
off) and for the compressor. Early models
(before late 1990 production) had a reset
switch is mounted on the circuit board.
ON/OFF SWITCH
LOW
PRESSURE
CUT OUT
SWITCH
POTENTIAL
RELAY
TRANSFORMER
CIRCUIT
BOARD
Transformer: Supplies low voltage to the
circuit board.
Low Pressure Cut Out Switch: A manual
reset control that shuts off the ice machine
when the low side pressure drops below a
preset point, 0-4 psig.
Potential Relay: The compressor start relay.
On/Off Switch: Manual control for the
machine.
January, 1991
Page 11
NM650
CONTACTOR