Follett Maestro Plus MCC425A S Series Operation And Service Manual page 26

High refrigerant pressure
Should the refrigeration pressure rise above 425 PSI (2930.3 kPA), 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 (2034.0 kPA) 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
Relay
3
YELLOW
R
S
C
Gearmotor
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
Relay
3
YELLOW
R
S
C
Gearmotor
A B C D
Water Sensors
26 MC_425A/W, MM_425A/W, MF_425A/W, _P425A/W Ice Machines
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
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
Fan
WHITE
N
N
P15
L1
BLACK
L1
HI PRS
RED
P6
P21
P20
BROWN
P19
BLACK
P3
WATER LEVELS
P22
BLUE
BIN
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
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