Manitowoc J250 User Manual

Section 6Electrical System
6-6
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.
(Old Style Control Board Shown)
Self-Contained Models
4. Freeze (Until 7 Seconds of Water Contact with Ice Thickness Probe)
Toggle Switch
ICE
Bin Switch
Closed
Control Board Relays
#1 Closed
Water Pump ON
#2 Open
Hot Gas Solenoid OFF
#3 Open
Water Dump Valve OFF
#4 Closed
Contactor Coil ON
Compressor ON
Condenser Fan Motor ON
Safety Controls (Which could stop ice machine operation)
High Pressure Cut-Out Closed
Main Fuse (On Control Board) Closed
Transformer Fuse (On Control Board) Closed
Thermistor Operation OK
SV1562
L1
TB35
TB30
TB30
TB30
TB30
SEE SERIAL PLATE FOR VOLTAGE
L2
(
N
)
TB32
(
55
)
(
61
)
(
60
)
(
77
)
(
80
)
(
76
)
(
75
)
(
98
)
(
99
)
TB3
TB37
(
59
)
(
73
)
(
74
)
(
56
)
(
58
)
(
57
)
HOT GAS
SOLENOID
DUMP
SOLENOID
WATER
PUMP
TERMINATES AT
PIN CONNECTION
CONTACTOR COIL
TRANS. FUSE
FUSE
(
7A
)
ICE THICKNESS PROBE
DISCHARGE LINE THERMISTOR
3
1
2
4
1D
1C
1B
1
A
BIN SWITCH
(
62
)
(
63
)
(
65
)
(
64
)
(
66
)
(
66
)
(
67
)
(
62
)
(
69
)
(
68
)
HARVEST LIGHT/
SAFETY CODE LIMIT LIGHT
BIN SWITCH LIGHT
ICE
OFF
CLEAN
TOGGLE SWITCH
VIEW FOR WIRING
62
66
69
67
68
HIGH
PRESSURE
CUTOUT
←
←←
←INTERNAL
WORKING VIE
W
TB35
TB33 TB34
TB30
TB30
(
49
)
(
47
)
COMPRESSOR RUN CAPACITOR
SR
C
RR
*OVERLOAD
PTCR
(
46
)
(
45
)
(
50
)
(
42
)
(
48
)
(
52
)
(
85
)
(
86
)
(
53
)
FAN CYCLE
CONTROL
L1
RUN CAPACITOR**
FAN MOTOR
(AIR-COOLED ONLY)
CONTACTOR
CONTACTS

Manitowoc J250 Specifications

General

Brand	Manitowoc
Model	J250
Category	Ice Maker
Language	English