Manitowoc S model, Service Manual

Page: 75 / 168

Section 6 Electrical System
Part Number 80-1480-3
6-15
Harvest Sequence
5. WATER PURGE
The harvest valve and HPR solenoid
also open 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 (turns on) and de-
energizes (turns off) strictly by time.
The water fill valve energizes for the
last 15 seconds of the 45-second
water purge. The water purge must
be at the factory setting of 45
seconds for the fill valve to energize
during the last 15 seconds of the
Water Purge. If set at less than 45
seconds the water fill valve does not
energize during the water purge.
NOTE: After the 45 second water
purge, the water fill valve, water
pump and dump valve de-energize.
(Refer to “Water Purge Adjustment”
for details.)
Remote — Water Purge
Table 6-12. Remote Models
5. Water Purge (45 Seconds)
Toggle Switch ICE
Bin Switch Closed
Control Board Relays
#1 Water Pump ON
#2 Harvest Valve (Left) / HPR Valve 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 / Liquid Line Solenoid Closed / ON
#7A Compressor ON
#7B Condenser Fan Motor ON
Safety Controls (Which could stop ice machine operation)
High Pressure Cut-Out Closed
Main Fuse (On Control Board) Closed
SV3158-5
Water Valve
Harvest Valve
Dump Valve
Water Pump
(20)
(21)
(79)
(74)
(61)
(60)
(57)
(98)
(22)
(76)
(81)
(77)
(80)
(26)
(25)
(58)
(59)
Contactor Coil
(56)
L2
Air Compressor
(8)
(83)
(88)
(22)
(75)
Liquid Line
Solenoid
HPR Valve
(55)
(89)
(9)
(78)
(82)
(42)
(50)
(45)
(46)
(F2)
(F1)
(51)
Black
Red
Yellow
(L1)
(L1)
(L2)
(6)
(1)
(2)
Remote Fan Motor
Remote
Condenser
Run Capacitor
Contactor
Contacts
Compressor
Ice Thickness
Probe
Water Level
Probe
High Pressure
Cut-out
Ground
Run
Cap.
OFF
Clean
ON
Bin Switch
Trans
Fuse 7A
Control Board
(2)
(6)
(5)
(1)
(7)
(4)
PTCR
Low DC
Voltage
Plug
(99)
SV3158-6