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Electrical control system schematic
BLACK #26
L1
WHITE #25
L2/N
GRN-YEL #24
GND
BLACK #23
DISP
BIN
CONTACT
CLOSURE
O.L.
C
S
R
GREEN #57
BLACK #58
BLACK #59
1 2 3 4 5 6 7 8 9
C2 START
COMPRESSOR
COMPRESSOR
ELECTRICAL
BOX
5
2
6
BLACK #71
1
4
C1 RUN
BLACK #66
BLACK #69
Electrical control system operation
The P425A/W, MCD425A/W_S and R425A/W wiring diagrams which follow illustrate the circuitry of Follett ice
machines used with ice dispensers. Both normal operation of the ice machine (Stages 1–6) and non-normal
diagnostic sequences showing torque-out (Stages 7–10) for use in troubleshooting ice machine problems are
shown.
Circuitry notes
When the ice machine is used with a dispenser it receives power from the main power supply. Disconnect the
power source before performing service. When performing electrical service, always use a meter to determine
whether or not the components being serviced are energized.
§ High pressure cutout opens at 425 PSI and closes at 287 PSI (auto reset).
§ The bin signal input to the control board in the 425A/W ice machine must only be initiated by contact closure. Do
not supply power. To run the ice machine in the workshop, use the bin signal jumper (P/N 01069095).
P2
P6
P21
P20
P19
P3
P22
BLUE
#15
FEED VALVE
COMP.
#04
DRAIN VALVE
WHITE
#05
START
RELAY
4
2
BLACK
YELLOW
3
FAN
CAPACITOR
BLACK
YELLOW
MCD425A/W, R425A/W, MFD425A/W, P425A/W Ice Machines
N
N
N
N
N
N
N
N
N
BLACK #01
D18
K3
D37
CURRENT SENS
P5
T2
AUGER
GRN #17
SPLIT-PHASE
START
DRAIN CLOG
RUN
T.O.L.
SENSOR
OR
RESERVOIR
PSC MOTOR
WATER SENSOR
START
BLUE
RUN
T.O.L.
BLACK #23
BLACK #51
ICE AUX
WATER AUX
P15
P16
T1
HI PRS
P14
K1
MODEL SELECT
P9
2
6
5
1
PROGRAM
S2
RESET
P10
P17
SERIAL COMM
WATER LEVELS
RS485 UI
P7
P12
BIN
P11
P13
P8
RS485
P18
P11
CLEAN SAFE
P12
BIN
P17
WATER LEVELS
HI PRS
P14
VIOLET
BLACK
A B C D
RED
P
ORANGE
HIGH
YELLOW
BLACK
PRESS
D1
POWER
D2
LOW BIN
D3
MAKING ICE
D4
SLEEP CYCLE
D5
TIME DELAY
S1
D6
LOW WATER
D7
MAINTENANCE
D8
SERVICE
D9
HI AMPS
D10
HI PRESSURE
D11
DRAIN CLOG
D12
CLEANER FULL
D13
D14
D15
MAINT.
CLEAN
13
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