Scotsman NME1250R Service Manual page 13

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.
POTENTIAL
RELAY
TRANSFORMER
CIRCUIT
BOARD
Transformer: Supplies low voltage to the circuit
board.
Pump Down Control: A switch to control the
compressor, depending upon low side pressure:
closes at 30 PSIG, and opens at 15 PSIG.
Potential Relay: The compressor start relay.
On/Off Switch: Manual control for the machine.
June 1995
Page 13
NME1250R
PUMP DOWN
CONTROL
SWITCH
OF/OFF
SWITCH
CONTACTOR