Ice Machine Operational And Diagnostic Sequences - Follett Symphony Plus 50 Series Installation, Operation And Service Manual

Ice machine operational and diagnostic sequences

The wiring diagrams that follow illustrate the circuitry of Follett ice machines used with 25/50 series ice dispensers .
Both normal operation (stages 1—8) and non-normal diagnostic sequences showing torque-out for use in
troubleshooting are shown .
Circuitry notes
§ Bin signal is contact closure only — DO NOT SUPPLY POWER .
Note: The operation stage descriptions that follow are based on the unit containing the split-phase gear
motor.
Normal operation – Stage 1
Power is supplied to L1 of the control board, the POWER LED light begins flashing . The ice level bin thermostat in
the dispenser is closed and calling for ice, supplying contact closure to the control board . The LOW BIN LED will be
on . The control board will now go through the start-up sequence . The board checks the water sensors (located in
the reservoir) for continuity between the common probe (B) and the high probe (C) . If continuity is not sensed, the
water fill valve (P21) is energized .
Start
Relay
Capacitor
OR
YELLOW
Water Sensors
20
T.O.L.
R
S
C
Compressor
2 1
RED
Start
Relay
5
Compressor
Electrical Box
WHITE
Drain Fill
4
Valve Valve
3 2
BLACK
R
S
C
Gearmotor
A B C D
Drain Clog Sensor
Fan
WHITE
N
N
L1
BLACK
L1
RED
P6
P21
BROWN P20
P19
BLACK
P3
P22
BLUE
P4
AUGER
Bin T-Stat
25CI425A/W, 25HI425A, 50CI425A/W, 50HI425A
High
Pressure
Switch
POWER
P15
LOW BIN
MAKING ICE
SLEEP CYCLE
HI PRS
TIME DELAY
LOW WATER
1 2 3 4 5 6 7 8
MAINTENANCE
RESET
SERVICE
HI AMPS
WATER LEVELS
HI PRESSURE
DRAIN CLOG
BIN P11
CLEANER FULL
Clean Switch