Manitowoc S0850M, Service Manual

Page: 44 / 100

Electrical System Section 6
6-6
Part Number 80-1558-3
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 45-
second 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.)
Self-Contained — Water Purge
Table 6-5. Self-Contained Models
5. Water Purge (45 Seconds)
Toggle Switch ICE
Bin Switch Closed
Control Board Relays
#1 Water Pump ON
#2 Harvest Valve (Left) ON
#3 Harvest Valve (Right) ON (When Used)
#4 Not Used
#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
SV3137-6
(89)
(55)
(88)
High
Pressure
Cutout
Control Board
L1
Ground
(2)
(6)
(5)
(1)
(7)
(4)
L2 or N
Water Valve
Harvest Valve
(20)
(21)
(22)
(61)
Dump Valve
Water Pump
(60)
(76)
(81)
(75)
(77)
(80)
(57)
(98)
(58)
(59)
(42)
Ice Thickness
Probe
Water Level Probe
Trans.
Fuse (7a)
L2
Terminates at
Pin Connection
(99)
Contactor Coil
(56)
Air Compressor
(26)
(25)
Low DC
Voltage
Plug
Bin Switch
Clean
OFF
ICE
(2)
(1)
(6)
(8)
(9)
(74)
Compressor
Run Capacitor
(Red)
(Yellow)
Fan Motor
PTCR
(45)
(46)
(50)
(51)
(85)
Overload
(Black)
(86)
Fan Cycle
Control
L1
Contactor
Contacts
Run Capacitor