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Normal operation – Stage 4
One second (1 s) after the fan comes on, the COMPRESSOR output comes on. The compressor circuit uses both
run and start capacitors along with a potential start relay. The start capacitor in energized through the normally
closed contacts of the start relay.
Start
Relay
Capacitor
OR
YELLOW
Water Sensors
Normal operation – Stage 5
As the compressor comes up to normal running speed, its start winding generates a voltage potential across the
relay's coil. This energizes the coil to open the contact and drop out the start capacitor.
The ice machine is now in a normal ice making mode. The ice machine will produce ice until the bin level control
in the ice dispenser is satisfied.
Start
Relay
Capacitor
OR
YELLOW
Water Sensors
16
MCD425A/W, R425A/W, MFD425A/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
3
BLACK
R
S
C
Gearmotor
A B C D
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
A B C D
Drain Clog Sensor
Fan
WHITE
N
N
L1
BLACK
L1
RED
P6
P21
P20
BROWN
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
P11
BIN
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
BIN
P11
CLEANER FULL
Clean Switch
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