Manitowoc J250 Service Manual page 62

Section 6
Initial Start-Up Or Start-Up After
Automatic Shut-Off (cont.)
2. REFRIGERATION SYSTEM
START-UP
The compressor, remote condenser fan
motor and liquid line solenoid valve
energize after the 45-second water purge,
and remain on throughout the Freeze and
Harvest cycles.
The hot gas valve and harvest pressure
regulating (HPR) solenoid valve remain
on for the first 5 seconds of the initial
compressor start-up.
(The compressor and the condenser fan
motor are wired through the contactor.
Any time the contactor coil is energized,
these components are supplied with
power.)
Remote Models
Toggle Switch
Bin Switch
Control Board Relays
#1
Water Pump
#2
Hot Gas Solenoid
Harvest Pressure Regulating (HPR) Solenoid
#3
Water Dump Valve
#4
Contactor Coil
Liquid Line Solenoid
Compressor
Condenser Fan Motor
Safety Controls (Which could stop ice machine operation)
High Pressure Cut-Out
Main Fuse (On Control Board)
Transformer Fuse (On Control Board)
Thermistor Operation
L1
TB35
HIGH
PRESSURE
CUT-OUT
ICE THICKNESS PROBE
DISCHARGE LINE THERMISTOR
CONTACTOR
CONTACTS
(42)
TB35
L1
TB33
2. Refrigeration System Start-Up (5 Seconds)
TB32 (55)
3
1
2
4
TRANS. FUSE
FUSE (7A)
1D
1C
1B
1A LOW D.C.
VOLTAGE
PLUG
(62)
(63)
BIN SWITCH
(64) (65)
(68)
(67)
ICE
(69)
(66) (66)
OFF
CLEAN
(62)
(49)
COMPRESSOR
(47)
R S
C
*OVERLOAD
(48)
(51)
(52) (53)
TERMINATES AT
TB34
PIN CONNECTION
(F1)
(Old Style Control Board Shown)
ICE
Closed
Open
OFF
Closed
ON
ON
Open
OFF
Closed
ON
Energized
ON
ON
Closed
Closed
Closed
OK
Electrical System
SEE SERIAL PLATE FOR VOLTAGE
L2 (N)
HPR
SOLENOID
(78) (79)
(61)
(60)
(71)
(80)
HOT GAS
SOLENOID
(76) (75)
(81)
DUMP
(57) SOLENOID
TB31 (98) (99)
WATER
(58)
PUMP
TB37
(59) (83) (82)
LIQUID LINE
SOLENOID
(73)
(74)
CONTACTOR
(56)
COIL
HARVEST LIGHT/
SAFETY LIMIT CODE LIGHT
BIN SWITCH LIGHT
TOGGLE SWITCH
VIEW FOR WIRING
68
← ← ← ← INTERNAL
66 67
WORKING VIEW
62
69
RUN CAPACITOR
R R
(46) (50)
(45)
PTCR
(F2)
REMOTE FAN
MOTOR
REMOTE
CONDENSER
SV1553
RUN CAPACITOR
6-11
TB30
TB30
TB30
TB30
TB30
TB30