Follett MCC425A/W S Operation And Service Manual page 18

Normal operation – Stage 1 - 230V 50 Hz
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.
T.O.L.
RED
Start
Relay
4
3 2
YELLOW BLACK
R
S
C
Gearmotor
A B C D
Water Sensors
Normal operation – Stage 1 - 220 V 60 Hz
The 220 V 60 Hz is identical to the 230 V 50 Hz EXCEPT that the compressor output and neutral are reversed, as
shown in the diagram below. The remaining Stages show only the 230 V 50 Hz applications.
RED
Start
Relay
4
3 2
YELLOW BLACK
R
S
C
Gearmotor
A B C D
Water Sensors
18 MC_425A/W, MM_425A/W, MF_425A/W, _P425A/W Ice Machines
R
S
C
Compressor
2 1
Start
Relay
5
Compressor
Electrical Box
WHITE
Drain
Fill
Valve Valve
Bin T-Stat
Drain Clog Sensor
5
Start
Relay
2
1
Compressor
C
S
R
T.O.L.
Compressor
Electrical Box
WHITE
Drain Fill
Valve
Valve
Bin T-Stat
Drain Clog Sensor
Fan
WHITE
N
N
P15
L1
BLACK
L1
HI PRS
RED
P6
P21
BROWN P20
P19
BLACK
P3
WATER LEVELS
P22
BLUE
P4
AUGER
Fan
WHITE
N
N
P15
L1
BLACK
L1
HI PRS
RED
P6
P21
P20
BROWN
P19
BLACK
P3
WATER LEVELS
P22
BLUE
P4
AUGER
High
Pressure
Switch
POWER
LOW BIN
MAKING ICE
SLEEP CYCLE
TIME DELAY
1 2 3 4 5 6 7 8 LOW WATER
MAINTENANCE
RESET
SERVICE
HI AMPS
HI PRESSURE
DRAIN CLOG
BIN P11
CLEANER FULL
Clean Switch
High
Pressure
Switch
POWER
LOW BIN
MAKING ICE
SLEEP CYCLE
TIME DELAY
LOW WATER
1 2 3 4 5 6 7 8
MAINTENANCE
RESET
SERVICE
HI AMPS
HI PRESSURE
DRAIN CLOG
P11
BIN
CLEANER FULL
Clean Switch