Manitowoc J250 User Manual

Section 6 Electrical System
6-3
Wiring Diagram Sequence of Operation
SELF-CONTAINED MODELS
Initial Start-Up or Start-Up After
Automatic Shut-Off
1. WATER PURGE
Before the compressor starts, the water
pump and water dump solenoid are
energized for 45 seconds to purge old
water from the ice machine. This ensures
that the ice-making cycle starts with fresh
water.
The hot gas valve(s) is also energized
during the water purge. In the case of an
initial refrigeration start-up, it stays on for
an additional 5 seconds (50 seconds
total).
(Old Style Control Board Shown)
Self-Contained Models
1. Water Purge (45 Seconds)
Toggle Switch
ICE
Bin Switch
Closed
Control Board Relays
#1 Closed
Water Pump ON
#2 Closed
Hot Gas Solenoid ON
#3 Closed
Water Dump Valve ON
#4 Open
Contactor Coil OFF
Compressor OFF
Condenser Fan Motor OFF
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
SV1559
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