Scotsman NM650R Service Manual page 17

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:
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 liquid line valve. Also includes
the reset switch.
Transformer: Supplies low voltage to the
circuit board.
ON/OFF SWITCH
PUMP DOWN CONTROL
POTENTIAL RELAY
TRANSFORMER
CIRCUIT
BOARD
Pump Down Control: An automatic reset
pressure switch connected to the low side of
the refrigeration system. Controls the
compressor.
Potential Relay: The compressor start relay.
On/Off Switch: Manual control for the
machine.
Reset Switch: Manual reset. When the unit
shuts off from the ice discharge chute being
overfilled (opening the microswitch at the top
of the chute) or if the high pressure cut out
switch opens.
December, 1988
Page 17
NM650R
CONTACTOR
RESET SWITCH