S1800 Marine Model Ice Machines – Service Manual - Manitowoc Ice

Electrical System Section 6
Harvest Sequence
5. WATER PURGE
The harvest valve(s) opens at the
beginning of the water purge to divert
hot refrigerant gas into the
evaporator.
The water pump continues to run,
and the water dump valve energizes
for 45 seconds to purge the water in
the sump trough. The water fill valve
energizes and de-energizes strictly
by time. The water fill valve energizes
for the last 15 seconds of the 45second
water purge.
After the 45 second water purge, the
water fill valve, water pump and
dump valve de-energize. (Refer to
“Water Purge Adjustment” for
details.)
The air compressor (when used) will
energize after 35 seconds.
L1
(88)
Ground
(89)
High
Pressure
Cutout
(42)
Self-Contained — Water Purge
Table 6-5. Self-Contained Models
5. 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 ON; after 35 seconds
#5 Water Inlet Valve
30 seconds OFF,
15 seconds ON
#6 Water Dump Valve ON
#7 Contactor Coil Closed / ON
#7A Compressor ON
#7B Condenser Fan Motor OFF; May Cycle ON
Safety Controls (Which could stop ice machine operation)
High Pressure Cut-Out Closed
Main Fuse (On Control Board) Closed
(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)
SV3137-6
6-6 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)
Dump Valve
(76)
(81)
Water Pump
(98)
(59)
Terminates at
Pin Connection
Contactor Coil
(56)
Air Compressor
Bin Switch
PTCR
Fan Motor
Clean
OFF
ICE
Run Capacitor
(74)
Run Capacitor
(45)
(50)
(99)
L2 or N
(75)