S1800 Marine Model Ice Machines – Service Manual - Manitowoc Ice

Electrical System Section 6
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 harvest valve(s) is also
energized during the water purge. In
the case of an initial refrigeration
start-up or auto shut-off, it stays on
for an additional
5 seconds (50 seconds total).
The air compressor energizes for the
last 10 seconds of the cycle.
L1
(88)
Ground
(89)
High
Pressure
Cutout
(42)
(55)
Ice Thickness
Probe
Water Level Probe
Contactor
Contacts
(Black)
L1
Overload
(51) (85)
Control Board
(2)
(6)
(5)
(1)
(7)
(4)
Trans.
Fuse (7a)
Water Valve
(21)
(22)
Harvest Valve
(77)
(80)
Dump Valve
SV3137-2
Self-Contained — Water Purge
Table 6-1. Self-Contained Models
1. Water Purge (45 Seconds)
Toggle Switch ICE
Bin Switch
Control Board Relays
Closed
#1 Water Pump ON
#2 Harvest Valve (Left) ON
#3 Harvest Valve (Right) ON (When Used)
#4 Air Compressor 35 sec. OFF / 10 sec. ON
#5 Water Inlet Valve OFF
#6 Water Dump Valve ON
#7 Contactor Coil Open / OFF
#7A Compressor OFF
#7B Condenser Fan Motor OFF
Safety Controls (Which could stop ice machine operation)
High Pressure Cut-Out Closed
Main Fuse (On Control Board) Closed
6-2 Part Number 80-1634-3
Low DC
Voltage
Plug
(Red)
Fan Cycle
Control
(9)
L2
(25)
(8)
Compressor
(86)
(Yellow)
(61)
(26)
(1)
(2)
(20)
(60)
(57)
(6)
(46)
(58)
(76) (81)
Water Pump
(98)
(59)
Contactor Coil
(56)
Air Compressor
Bin Switch
PTCR
Fan Motor
Clean
OFF
ICE
Run Capacitor
Terminates at
Pin Connection
Run Capacitor
(45)
(74)
(50)
(99)
L2 or N
(75)