Manitowoc Marine Q 1800 Service Manual page 9

Freeze Sequence (cont.)
4. FREEZE
The water pump starts after the 30-
second pre-chill. An even flow of
water is directed across the evaporator
and into each cube cell, where it
freezes.
When sufficient ice has formed, the
water flow (not the ice) contacts the
ice thickness probes. After
approximately 7 seconds of continual
contact, a harvest cycle is initiated.
NOTE: The ice machine cannot
initiate a harvest cycle until a 6-
minute freeze lock has expired.
Self-Contained Models
4. Freeze (Until 7 Seconds of Water Contact with Ice Thickness Probe)
Toggle Switch
Bin Switch
Control Board Relays
#1 Water Pump
#2 Water Fill Valve
#3 Hot Gas Solenoid
#4 Water Dump Valve
#5 Contactor Coil
Compressor
Safety Controls (Which could stop ice machine operation)
High Pressure Cut-Out
Main Fuse (On Control Board)
L1
(55)
TB32
TB35
HIGH PRES
CUTOUT
ICE THICKNESS PROBE
WATER LEVEL PROBE
NOT USED
(62)
(63)
(64)
BIN SWITCH
(66)
CONTACTOR
*OVERLOAD
CONTACTS
(42) (48)
TB35
L1
(51)
(52) (85)
TB33
FAN CYCLE CONTROL
Electrical System
SEE SERIAL PLATE FOR VOLTAGE
(61)
(60)
2
4
1
3
5
(57)
TB31
TRANS.
FUSE (7A) (58)
TB37
1C
(56)
1F
CLEAN LIGHT
LOW D.C.
1G
VOLTAGE
PLUG WATER LEVEL
BIN SWITCH LIGHT
HARVEST LIGHT/
SAFETY LIMIT CODE LIGHT
(65)
TOGGLE SWITCH
(68)
ICE
(67)
(69) INTERNAL WORKING
OFF
VIEW
(66)
CLEAN
(62)
(49)
COMPRESSOR
RUN CAPACITOR
(47)
R
R
S
(46)
C
(45)
PTCR
(86) (53)
TB34
FAN MOTOR
RUN CAPACITOR**
(AIR COOLED ONLY)
ICE
Closed
Closed / ON
Cycles ON then OFF
Open / OFF
Open / OFF
Closed / ON
ON
Closed
Closed
L2 (N)
(22)
(21)
WATER
VALVE
(77)
(80)
HOT GAS
SOLENOID
(76)
(75)
TB30
(81)
DUMP
SOLENOID
(99)
(98)
TB30
WATER
PUMP
(59)
TERMINATES AT
PIN CONNECTION
(73) (74)
TB30
CONTACTOR
COIL
TB30
VIEW FOR WIRING
68
66
67
62
69
R
(50)
TB30
TB30
SV1646-4
5