Scotsman NM1850R Manual page 15

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.
Transformer: Supplies low voltage to the
circuit board.
ON/OFF SWITCH
PUMP DOWN CONTROL
POTENTIAL RELAY
TRANSFORMER
CIRCUIT
BOARD
There are two control boxes in the machine.
September, 1992
Page 15
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.
Prior Models: A manual reset switch was
part of the circuit board. Lights up 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. Not used after July, 1990.
NM1850R
CONTACTOR