Follett L77091 Installation, Operation And Service Manual page 23

High refrigerant pressure
Should the refrigeration pressure rise above 425 psi, the high pressure switch contacts will open. The board sees
the open circuit and the HIGH PRESSURE and TIME DELAY LEDs will come on, the machine shuts down. After
the one hour time delay, the machine will attempt to restart. If the pressure has fallen below the reset point of 295
psi and the board see the contacts closed, the machine will resume normal operation. If the contacts are still open
after the restart, the board will again go into HIGH PRESSURE and TIME DELAY, cycling until contact closure is
seen.
Start
Capacitor Relay
OR
YELLOW
A B C D
Water Sensors
Drain clog
If continuity is seen between the two drain clog sensor probes, the DRAIN CLOG LED will come on and the
machine will shut down. The machine will not restart unless the manual reset button is depressed while power is
on.
Start
Capacitor
Relay
OR
YELLOW
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
3 2
BLACK
R
S
C
Gearmotor
Drain Clog Sensor
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
Drain Clog Sensor
MCD425A/W, R425A/W, MFD425A/W, P425A/W Ice Machines
Fan
WHITE
N
N
L1
BLACK
L1
RED
P6
P21
BROWN P20
P19
BLACK
P3
P22
BLUE
P4
AUGER
Bin T-Stat
Fan
WHITE
N
N
L1
BLACK
L1
RED
P6
P21
P20
BROWN
P19
BLACK
P3
P22
BLUE
P4
AUGER
Bin T-Stat
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
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
P11
BIN
CLEANER FULL
Clean Switch
23