Follett MCC425A/W S Operation And Service Manual page 23

Self-flushing
At the completion of the 20 minute time delay, the machine checks for a cumulative one hour of ice making time
since the last off-cycle flush. If the cumulative ice making time exceeds one hour, the machine will energize the
drain valve P19 for 60 seconds to drain the evaporator. It will then refill with water, flush again, refill and begin
making ice if the LOW BIN LED is on. If the ice making time is less than 1 hour, the machine will start and begin
making ice without draining the evaporator.
Start
Relay
3
YELLOW
R
S
C
Gearmotor
A B C D
Water Sensors
Diagnostic Stages
High gearmotor amps – Stage 1
The HI AMPS error and TIME DELAY LEDs are on indicating that the control board has sensed an over-torque
condition at the P4 terminal (more than 1.8A from the gearmotor) or no current draw (0A) and shut the ice machine
down (strike one). The HI AMPS and TIME DELAY LEDs will remain on for 60 minutes after an over-torque
condition has occurred. The ice machine will remain off as long as these two LEDs are on. After the 60 minute time
delay, these LED lights turn off, and the control board will try to go through a normal start-up sequence.
T.O.L.
RED
Start
Relay
4
2
3
YELLOW BLACK
R
S
C
Gearmotor
A B C D
Water Sensors
T.O.L.
R
S
C
Compressor
2
1
RED
Start
Relay
5
Compressor
Electrical Box
WHITE
Drain Fill
4
Valve Valve
2
BLACK
Bin T-Stat
Drain Clog Sensor
R
S
C
Compressor
2
1
Start
Relay
5
Compressor
Electrical Box
WHITE
Drain Fill
Valve Valve
Bin T-Stat
Drain Clog Sensor
MC_425A/W, MM_425A/W, MF_425A/W, _P425A/W Ice Machines
Fan
WHITE
N
N
P15
L1
BLACK
L1
HI PRS
RED
P6
P21
P20
BROWN
P19
BLACK
P3
WATER LEVELS
P22
BLUE
P4
AUGER
Fan
WHITE
N
N
P15
L1
BLACK
L1
HI PRS
1 2 3 4 5 6 7 8
RED
P6
P21
BROWN P20
P19
BLACK
P3
WATER LEVELS
P22
BLUE
BIN
P4
AUGER
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
BIN P11
CLEANER FULL
Clean Switch
High
Pressure
Switch
POWER
LOW BIN
MAKING ICE
SLEEP CYCLE
TIME DELAY
LOW WATER
MAINTENANCE
RESET
SERVICE
HI AMPS
HI PRESSURE
DRAIN CLOG
P11
CLEANER FULL
Clean Switch
23