Electrical Sequence - Scotsman FM2400RH Service Manual

ELECTRICAL SEQUENCE

Refer the wiring diagram as needed.
Each system is separate
If the machine is switched off at the master switch,
but is otherwise ready to go, switching the master
switch to on and pressing the start reset switch
does the following:
The bin empty light on the circuit board goes on
There is a 15 second delay
If there is enough water in the reservoir, the
circuit board will allow the machine to start up.
Start up consists of:
The liquid line relay and auger motor relay
become energized, connecting power to the
windings of the auger motor.
The auger motor starts, and the centrifugal
switch closes, connecting power to the liquid
line valve coil.
The liquid line valve opens, and the refrigerant
flows to the thermostatic expansion valve and
into the evpaorator.
As ice goes past the ice level sensors, the bin
empty light will stay on, and the machine will
continue to run, unless the ice stays between
the sensors for more than 15 seconds (bin full).
At that point, the bin empty light goes out, and
the machine shuts down.
Shut Down consists of:
The liquid line relay opens.
The liquid line valve closes
Ice making stops
The auger motor is run by the circuit board for
2.5 more minutes, clearing out ice in the
evaporator, and then
The auger motor relay opens, and the auger
motor stops.
If the ice level sensor is clear (bin empty) for more
than 15 seconds, the machine will start up again.
Another purpose of the circuit board is to turn the
machine off if there is not enough water in the
machine.
When the water level in the reservoir falls
below the water level sensor, the machine will
"shut down"
When the water refills the reservoir, the
machine will start up again.
Separate from the circuit board:
If the spout switch opens, the machine will stop
immediately (through the relays on the circuit
board) and cause the reset switch on the circuit
board to light up. It must be manually reset at
the reset switch on the circuit board.
The master switch is the manual control for
each system, but it is not a service disconnect.
August 1994
Page 11
FM2400RH