Manitowoc J250 Service Manual page 58

Section 6
Harvest Sequence
5. WATER PURGE
The water pump continues to run as the
water dump valve energizes for 45
seconds to purge the water from the water
trough.
The hot gas valve(s) opens at the
beginning of the water purge. Hot
refrigerant gas is diverted into the
evaporator throughout the 45-second
water purge.
After the 45-second water purge, the
water pump and dump valve de-energize.
New style control boards have an
adjustable water purge. This permits a 0
(off), 15, 30 or 45 second water purge.
Self-Contained Models
Toggle Switch
Bin Switch
Control Board Relays
#1
Water Pump
#2
Hot Gas Solenoid
#3
Water Dump Valve
#4
Contactor Coil
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
TB32 (55)
TB35
HIGH
PRESSURE
CUTOUT
ICE THICKNESS PROBE
DISCHARGE LINE THERMISTOR
BIN SWITCH
(64)
(66)
CONTACTOR
CONTACTS
*OVERLOAD
(42) (48)
TB35
L1
(52)
TB33
(Old Style Control Board Shown)
5. Water Purge (45 Seconds)
Electrical System
(61)
(60)
3 HOT GAS
SOLENOID
1
2
4
(57)
SOLENOID
TB3
TRANS. FUSE
(58)
FUSE (7A)
TB37
1D
1C
1B
HARVEST LIGHT/
1A
SAFETY CODE LIMIT LIGHT
(62)
BIN SWITCH LIGHT
(63)
TOGGLE SWITCH
(65)
(68)
(67)
ICE
← ← ← ← INTERNAL
(69)
(66)
OFF
WORKING VIEW
CLEAN
(62)
(49)
COMPRESSOR RUN CAPACITOR
(47)
R
R S
(46)
C
(45)
PTCR
(85) (86) (53)
TB34
FAN CYCLE
CONTROL
FAN MOTOR
RUN CAPACITOR**
(AIR-COOLED ONLY)
ICE
Closed
Closed
ON
Closed
ON
Closed
ON
Closed
ON
ON
ON
Closed
Closed
Closed
OK
SEE SERIAL PLATE FOR VOLTAGE
L2 (N)
(77)
(80)
(76) (75)
TB30
DUMP
(98) (99)
TB30
WATER
PUMP
(59)
TERMINATES AT
PIN CONNECTION
(73) (74)
TB30
CONTACTOR COIL
(56)
TB30
VIEW FOR WIRING
68
66 67
62
69
R
(50)
TB30
TB30
SV1563
6-7