Manitowoc QR0320A Service Manual page 70

Electrical System
Harvest Sequence
5. WATER PURGE
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"
on Page 3-3 for details.) The harvest
valve and HPR solenoid also open at
the beginning of the water purge to
divert hot refrigerant gas into the
evaporator.
Table 6-12. Remote Models
Toggle Switch
Bin Switch
Control Board Relays
#1 Water Pump
#2 Water Fill Valve
#3 Harvest Solenoid
Harvest Pressure Regulating (HPR) Solenoid
#4 Water Dump Valve
#5 Contactor Coil
Liquid Line Solenoid
Compressor
Condenser Fan Motor
Safety Controls (Which could stop ice machine operation)
High Pressure Cut-Out
Main Fuse (On Control Board)
6-14
L1
TB32 (55)
TB35
HIGH PRES
CUTOUT
ICE THICKNESS PROBE
WATER LEVEL PROBE
NOT USED
(64)
BIN SWITCH
(66)
CONTACTOR *OVERLOAD
CONTACTS
(48)
(42)
TB35
L1
(51)
(52)
TB33
(F1)
Figure 6-12. Remote — Water Purge
5. Water Purge (45 Seconds)
(20)
(61)
(60)
2
4
1
3
5
TRANS.
FUSE (7A)
(58)
1C
1F
CLEAN LIGHT
LOW D.C.
1G
VOLTAGE
WATER LEVEL
PLUG
BIN SWITCH LIGHT
(62)
(63)
HARVEST LIGHT/
SAFETY LIMIT CODE LIGHT
(65)
TOGGLE SWITCH
(68)
ICE
(67)
(69)
INTERNAL WORKING
OFF
(66)
CLEAN
(62)
(49)
COMPRESSOR
RUN CAPACITOR
(47)
R S
C
(53)
TERMINATES AT
TB34
PIN CONNECTION
REMOTE
FAN MOTOR
RUN CAPACITOR
Section 6
SEE SERIAL PLATE FOR VOLTAGE
L2 (N)
(21) (22)
WATER
VALVE
HPR
SOLENOID
(78) (79)
(77)
(80)
HARVEST
SOLENOID
(75)
(76)
(81)
DUMP
SOLENOID
(57)
TB31
(98) (99)
WATER
PUMP
(59)
TB37
(83) (82)
LIQUID LINE
SOLENOID
(73)
(74)
CONTACTOR
(56) COIL
VIEW FOR WIRING
68
66
67
VIEW
62
69
R
R
(50)
(46)
(45)
PTCR
(F2)
REMOTE CONDENSER
SV1648-5
ICE
Closed
Closed / ON
Cycles / OFF then ON
Closed / ON
Closed / ON
Closed / ON
Closed / ON
Energized
ON
ON
Closed
Closed
Part No. 80-1100-3
TB30
TB30
TB30
TB30
TB30
TB30