Section 6 Electrical System
6-13
Freeze Sequence (cont.)
4. FREEZE
The water pump starts after the 30-second
pre-chill. An even flow of water is
directed across the evaporator and into
each cube cell, where it freezes.
When sufficient ice has formed, the water
flow (not the ice) contacts the ice
thickness probes. After approximately 7
seconds of continual contact, a harvest
cycle is initiated.
NOTE: The ice machine cannot initiate a
harvest cycle until a 6-minute freeze lock
has expired.
(Old Style Control Board Shown)
Remote Models
4. Freeze (Until 7 Seconds of Water Contact with Ice Thickness Probe)
Toggle Switch
ICE
Bin Switch
Closed
Control Board Relays
#1 Closed
Water Pump ON
#2 Open
Hot Gas Solenoid OFF
Harvest Pressure Regulating (HPR) Solenoid OFF
#3 Open
Water Dump Valve OFF
#4 Closed
Contactor Coil ON
Liquid Line Solenoid Energized
Compressor ON
Condenser Fan Motor ON
Safety Controls (Which could stop ice machine operation)
High Pressure Cut-Out Closed
Main Fuse (On Control Board) Closed
Transformer Fuse (On Control Board) Closed
Thermistor Operation OK
SV1555
(74)
L1
TB35
SEE SERIAL PLATE FOR VOLTAGE
L2 (N)
TB32 (55)
HIGH
PRESSURE
CUT-OUT
HPR
SOLENOID
(79)(78)
(61)
(60)
(71)
(76)
(80)
HOT GAS
SOLENOID
DUMP
SOLENOID
TB30
TB30
TB30
TB30
(75)
(98) (99)
WATER
PUMP
TB31
TB37
(57)
(58)
(59) (82)(83)
LIQUID LINE
SOLENOID
CONTACTOR
COIL
(56)
(73)
(81)
TRANS. FUSE
FUSE (7A)
3
1
2
4
ICE THICKNESS PROBE
DISCHARGE LINE THERMISTOR
1D
1A
1C
1B
LOW D.C.
VOLTAGE
PLUG
(62)
(63)
(65)(64)
(66)
BIN SWITCH
(66)
(67)
(62)
(69)
(68)
ICE
OFF
CLEAN
HARVEST LIGHT/
SAFETY LIMIT CODE LIGHT
BIN SWITCH LIGHT
TOGGLE SWITCH
←
←←
←INTERNAL
WORKING VIEW
66
62
67
68
69
VIEW FOR WIRING
(49)
(47)
(46)
(45)
(50)
TB30
TB30
TB35
(48)(42)
(51)
(52)
L1
TB33 TB34
(53)
(F1) (F2)
CONTACTOR
CONTACTS
TERMINATES AT
PIN CONNECTION
COMPRESSOR RUN CAPACITOR
RR
PTCR
REMOTE FAN
MOTOR
RUN CAPACITOR
REMOTE
CONDENSER
*OVERLOAD
RS
C
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