Follett Maestro Plus MC 414A Series Installation, Operation And Service Manual page 22

High refrigerant pressure
Should the refrigeration pressure rise above 425 PSIG (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 PSIG (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.
T.O.L.
RED
Gearmotor
A B C D
Water Sensors
22 MC_414A, MF_414A R290 230 V/50 Hz Ice Machines
R
S
C
Compressor
2 1
Start
Relay
5
Compressor
Electrical Box
WHITE
Drain Fill
Valve Valve
Bin T-Stat
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
LOW WATER
1 2 3 4 5 6 7 8
MAINTENANCE
RESET
SERVICE
HI AMPS
HI PRESSURE
BIN P11
CLEANER FULL
Clean Switch