18
12CI400A • 12HI400A
Normal operation – Stage 2
The water sensor verifies water in the float reservoir. The water OK LED (WTR) comes on. At the same time,
the gearmotor, compressor and condenser fan motor come on, lighting the drive LED (DR) and compressor
LED (C). The high initial current draw of the compressor run winding closes the contacts of the current relay
energizing the start winding through the run capacitor. The gearmotor is also started through a current style
relay (or start capacitor) that is pulled in by the initial high current draw of the run winding. The PWR, B-E and
WTR LED remain on.
GRD
L1
L1
L2
L2
L2
L2
L2
COMPRESSOR
FAN
DRIVE
DR
C
20M
60M
2ND
WTR
B-T
B-E
RESET
GRD
G
B
W
FAN
BLACK
WHITE
BLACK
BLACK
R
ORANGE
S
S
L
COMPRESSOR
C
RED
BLACK
BLACK
INPUT
POWER
WATER
SENSOR
CONTROL
BOARD
BLA
CK
24V
COMMON
LINE
V
A
C
RED
RED
WHI
TE
BLA
CK
BIN T-STAT
BIN SIGNAL
FROM DISPENSER
JUNCTION BOX
(MCD400A/WVS series –
blk wire is on 24V)
WHITE
RED
WHITE
M
1
COMPRESSOR
SWITCH
PWR
BLACK
T.O.L.
BLACK
RED
HIGH PRESSURE
SAFETY SWITCH
M
WHI
TE
WHITE
BLUE
RELAY
START
T.O.L.
BLACK
4
2
3
YELLOW
GEAR MOTOR
START
RUN
GRD
L1
L1
L2
L2
L2
L2
L2
COMPRESSOR
FAN
DRIVE
DR
C
20M
60M
2ND
WTR
B-T
B-E
RESET
GRD
G
B
W
FAN
BLACK
WHITE
BLACK
BLACK
R
ORANGE
S
S
L
COMPRESSOR
C
RED
BLACK
BLACK
WHI
TE
INPUT
POWER
WATER
SENSOR
CONTROL
BOARD
BLA
CK
24V
COMMON
LINE
V
A
C
RED
RED
WHI
TE
BLA
CK
BIN T-STAT
BIN SIGNAL
FROM DISPENSER
JUNCTION BOX
(MCD400A/WVS series –
blk wire is on 24V)
WHITE
RED
WHITE
M
1
COMPRESSOR
SWITCH
PWR
BLACK
T.O.L.
BLACK
RED
HIGH PRESSURE
SAFETY SWITCH
M
WHITE
BLUE
RELAY
START
T.O.L.
BLACK
4
2
3
YELLOW
GEAR MOTOR
START
RUN
Normal operation – Stage 3
After the initial high current draw drops off, the gearmotor start relay contacts open, dropping out the start
winding (or start capacitor). As the compressor comes up to normal running speed, the compressor start relay
contacts also open, dropping out the start winding of the compressor. The ice machine is now in a normal
icemaking mode. The ice machine will begin to produce ice and continue to produce ice until the bin level
control in the ice dispenser is satisfied. The PWR, B-E, DR, C and WTR LEDs are all on.