Scotsman ND750 Service Manual page 9

ND750
COMPONENT DESCRIPTION: Control Box
Contactor: A definite purpose contactor
connecting the compressor 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. The reset switch is mounted on
the circuit board.
On/Off Switch: Manual control for the machine.
POTENTIAL RELAY
PORTION CONTROL
Transformer: Supplies low voltage to the circuit
board.
Potential Relay: The compressor
start relay.
Reset Switch: Part of Circuit
Board, manual reset. Lights up
when unit shuts off from: ice
discharge chute being overfilled
(opening the microswitch at the
top of the chute); low or high
pressure switches opening.
Portion Control Module: Controls
the amount of time the dipensing
drive motor is on. The time is
varied by adjusting the portion
control knob.
CONTACTOR
TRANSFORMER
CIRCUIT BOARD
RESET SWITCH
January, 1989
Page 9