Manitowoc S Service Manual page 67

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 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.)
The air compressor (when used) will
energize after 35 seconds.
Table 6-5. Self-Contained Models
Toggle Switch
Bin Switch
Control Board Relays
#1 Water Pump
#2 Harvest Valve (Left)
#3 Harvest Valve (Right)
#4 Air Compressor
#5 Water Inlet Valve
#6 Water Dump Valve
#7 Contactor Coil
#7A Compressor
#7B Condenser Fan Motor
Safety Controls (Which could stop ice machine operation)
High Pressure Cut-Out
Main Fuse (On Control Board)
Part Number 80-1480-3
L1
Ground
(55)
(89)
High
Pressure
Cutout
(88)
(42)
Ice Thickness
Probe
Water Level Probe
Contactor Overload
Contacts
(Black)
L1
(85)
(51)
Self-Contained — Water Purge
5. Water Purge (45 Seconds)
(20)
(61)
Control Board
(2)
(60)
(6)
(5)
(1)
(7)
(4)
(57)
Trans.
(58)
Fuse (7a)
L2
(25)
(26)
(9)
(8)
Bin Switch
Low DC
(6)
Voltage
Plug
(1)
(2)
(Red)
Compressor
(46)
(Yellow)
PTCR
(86)
Fan Motor
Fan Cycle
Control
Run Capacitor
Electrical System
L2 or N
Water Valve
(99)
(21)
(22)
Harvest Valve
(77)
(80)
Dump Valve
(75)
(76)
(81)
Water Pump
(98)
Terminates at
Pin Connection
(59)
Contactor Coil
(56)
Air Compressor
(74)
Clean
OFF
ICE
Run Capacitor
(50)
(45)
SV3137-6
ICE
Closed
ON
ON
ON (When Used)
ON; after 35 seconds
30 seconds OFF,
15 seconds ON
ON
Closed / ON
ON
OFF; May Cycle ON
Closed
Closed
6-7