Scotsman FME24RLM - Manual (Page 11)

ELECTRICAL SEQUENCE
There are 7 indicator lights on the control board:
· WTR-OK (Water OK). Green. Normal =
Glowing. Glows when there is water in the
reservoir.
· PWR-OK (Power OK). Green. Normal =
Glowing. Glows when the control board has
power and is functional.
· Service. Red. Normally Off.
· Freeze. Red. Normally glowing when making
ice.
· Bin Full. Red. Normally Off when making ice.
· LED1. White. Located next to the board’s
Compressor Relay (used to power the liquid line
valve). Normally Glowing when making ice.
· LED3. White. Located next to the board’s Auger
Motor Relay. Normally Glowing when making
ice.
If the machine is switched off at the mode switch,
but is otherwise ready to go, switching the mode
switch to ON does the following:
· The PWR-OK light glows.
· If there is water in the reservoir the WTR-OK
light glows.
· After 10 seconds the Freeze, LED1 and LED3
lights glow and the machine starts up.
Start Up:
· The compressor relay and auger motor relay
become energized, connecting power to the
windings of the auger motor and liquid line valve
coil.
· The liquid line valve opens, refrigerant flows to
the expansion valve and ice making begins.
· As ice is made it passes between the ice level
sensors but because it is not a continuous
stream it only interrupts the sensor’s infrared
beam momentarily. The bin full light remains off
and the machine stays on until ice builds up in
the bin and blocks the path between the
sensors for 6 seconds or longer. When that
occurs the bin full light glows and the machine
shuts down.
Shut Down:
· The compressor relay opens, LED1 goes out.
· The liquid line valve closes.
· The refrigerant flow stops.
· The auger motor stays on for 1 more minute,
clearing out ice in the evaporator, and then
· The auger motor relay opens, LED3 goes out
and the auger motor stops.
The liquid line valve will not re-open until 2 minutes
or more have passed after the last shut down.
If the path between the ice level sensors remains
clear for more than 10 seconds the ice machine
will restart.
Control Board Protection Devices
· When the water level in the reservoir falls
below the water level sensor’s tip, the WTR-OK
light goes out and the machine shuts down.
When water refills the reservoir the WTR-OK
light glows and the machine starts up again.
· If the auger drive motor current becomes
excessive the compressor and auger drive
motor will be switched Off and the Service light
will blink. The control board will restart the auger
drive motor in 4 minutes. If during the first 60
seconds after restart the auger motor current
stays within limits, the liquid line valve is
reopened and the machine returns to normal
operation. If the auger motor’s current is
excessive within 60 seconds after the restart,
the process will be repeated once more. If
during that try the current is still excessive the
machine shuts down and must be manually
reset. The service light will then be glowing
continuously.
To Reset: Disconnect and reconnect electrical
power to the unit.
The mode (on - off) switch is the manual control
for the complete machine, but it is not a service
disconnect.
Double System RL
November 2000
Page 11