Hoshizaki KMS-1401MLJ User Manual
Hoshizaki America, Inc.
Hoshizaki
Modular Crescent Cuber
Serenity Series
Model
KMS-1401MLJ
“A Superior Degree
of Reliability”
www.hoshizaki.com
Including
Condensing Unit Models
SRK-14J/3
SERVICE MANUAL
Number: 73192
Issued: 12-28-2011
WARNING
Only qualied service technicians should install and service the icemaker. To
obtain the name and phone number of your local Hoshizaki Certied Service
Representative, visit www.hoshizaki.com. No service should be undertaken until
the technician has thoroughly read this Service Manual. Failure to service and
maintain the icemaker in accordance with this manual will adversely affect safety,
performance, component life, and warranty coverage and may result in costly water
damage. Proper installation is the responsibility of the installer. Product failure or
property damage due to improper installation is not covered under warranty.
Hoshizaki provides this manual primarily to assist qualied service technicians in the
service of the icemaker.
Should the reader have any questions or concerns which have not been satisfactorily
addressed, please call, send an e-mail message, or write to the Hoshizaki Technical
Support Department for assistance.
Phone: 1-800-233-1940; (770) 487-2331
Fax: 1-800-843-1056; (770) 487-3360
E-mail: techsupport@hoshizaki.com
HOSHIZAKI AMERICA, INC.
618 Highway 74 South
Peachtree City, GA 30269
Attn: Hoshizaki Technical Support Department
Web Site: www.hoshizaki.com
NOTE: To expedite assistance, all correspondence/communication MUST include the
following information:
• Model Number
• Serial Number
• Complete and detailed explanation of the problem.
2
IMPORTANT
This manual should be read carefully before the icemaker is serviced. Read
the warnings and guidelines contained in this booklet carefully as they provide
essential information for the continued safe use, service, and maintenance of the
icemaker. Retain this booklet for any further reference that may be necessary.
CONTENTS
Important Safety Information ................................................................................................. 5
I. Specications ...................................................................................................................... 7
A. Icemaker ....................................................................................................................... 7
1. KMS-1401MLJ with SRK-14J ................................................................................... 7
2. KMS-1401MLJ with SRK-14J3 ............................................................................... 8
B. Condensing Unit ............................................................................................................ 9
1. SRK-14J ................................................................................................................... 9
2. SRK-14J3 .............................................................................................................. 10
II. General Information ..........................................................................................................11
A. Construction ................................................................................................................11
1. Icemaker ................................................................................................................11
2. Condensing Unit ................................................................................................... 12
B. Sequence of Operation ............................................................................................... 13
1. Sequence Cycles and Shutdown ........................................................................... 13
a) 1-Minute Fill Cycle ............................................................................................ 13
b) Initial Harvest Cycle ........................................................................................ 13
c) Freeze Cycle ................................................................................................... 13
d) Pump-Out Cycle ............................................................................................... 14
e) Harvest Cycle .................................................................................................. 14
f) Shutdown ......................................................................................................... 14
2. Sequence Flow Chart ............................................................................................ 15
C. Control Board .............................................................................................................. 16
1. Control Board Layout ............................................................................................. 17
2. LED Lights and Audible Alarm Safeties ................................................................. 18
3. Controls and Adjustments ...................................................................................... 19
a) Default Dip Switch Settings .............................................................................. 19
b) Harvest Timer (S4 dip switch 1 & 2) ................................................................. 19
c) Pump-Out Timer (S4 dip switch 3 & 4) ............................................................. 20
d) Pump-Out Frequency Control (S4 dip switch 5 & 6)......................................... 20
e) Harvest Pump Timer (S4 dip switch 7) ............................................................. 21
f) Factory Use (S4 dip switch 8) ........................................................................... 21
g) Freeze Timer (S4 dip switch 9 & 10) ................................................................ 21
h) Float Switch Selector (S5 dip switch 1) ............................................................ 22
i) Rell Counter (S5 dip switch 2 through 5) ......................................................... 22
3
D. Control and Service Switches ..................................................................................... 23
1. Control Switch ........................................................................................................ 23
2. Service Switch ....................................................................................................... 23
a) DRAIN .............................................................................................................. 23
b) CIRC. ............................................................................................................... 23
c) WASH ............................................................................................................... 23
III. Technical Information ...................................................................................................... 24
A. Water Circuit and Refrigeration Circuit ........................................................................ 24
B. Wiring Diagrams .......................................................................................................... 25
1. KMS-1401MLJ with SRK-14J ................................................................................. 25
2. KMS-1401MLJ with SRK-14J3 .............................................................................. 26
3. Wire Harness Connections .................................................................................... 27
C. Performance Data ....................................................................................................... 28
1. KMS-1401MLJ with SRK-14J ................................................................................. 28
2. KMS-1401MLJ with SRK-14J3 .............................................................................. 29
IV. Service Diagnosis ........................................................................................................... 30
A. Diagnostic Procedure .................................................................................................. 30
B. Control Board Check ................................................................................................... 34
C. Bin Control Check and Cleaning ................................................................................. 35
1. Bin Control Check .................................................................................................. 35
2. Bin Control Cleaning .............................................................................................. 36
D. Float Switch Check and Cleaning ............................................................................... 37
1. Float Switch Check ................................................................................................ 37
2. Float Switch Cleaning ............................................................................................ 38
E. Thermistor Check ........................................................................................................ 39
F. Diagnostic Charts ........................................................................................................ 40
1. No Ice Production ................................................................................................... 40
2. Freeze-Up .............................................................................................................. 41
3. Low Ice Production ................................................................................................ 43
V. Replacement of Components .......................................................................................... 44
A. Service for Refrigerant Lines ....................................................................................... 44
1. Refrigerant Recovery ............................................................................................. 44
2. Brazing .................................................................................................................. 45
3. Evacuation and Recharge (R-404A) ...................................................................... 45
B. Important Notes for Component Replacement ............................................................ 47
VI. Cleaning and Maintenance ............................................................................................ 48
A. Cleaning and Sanitizing Instructions ........................................................................... 48
1. Cleaning Procedure ................................................................................................ 49
2. Sanitizing Procedure - Following Cleaning Procedure ........................................... 50
B. Maintenance ................................................................................................................ 51
C. Preparing the Icemaker for Periods of Non-Use .......................................................... 52
VII. Disposal ......................................................................................................................... 54
4
Important Safety Information
Throughout this manual, notices appear to bring your attention to situations which could
result in death, serious injury, damage to the icemaker, or damage to property.
WARNING Indicates a hazardous situation which could result in death or
serious injury.
NOTICE Indicates a situation which could result in damage to the
appliance or property.
IMPORTANT Indicates important information about the use and care of the
appliance.
WARNING
This icemaker should be destined only to the use for which it has been expressly
conceived. Any other use should be considered improper and therefore dangerous.
The manufacturer cannot be held responsible for injury or damage resulting from
improper, incorrect, and unreasonable use. Failure to service and maintain the
appliance in accordance with this manual will adversely affect safety, performance,
component life, and warranty coverage and may result in costly water damage.
To reduce the risk of death, electric shock, serious injury, or re, follow basic
precautions including the following:
• Only qualied service technicians should install and service this icemaker.
• This icemaker must be installed in accordance with applicable national, state, and
local codes and regulations. Failure to meet these code requirements could result in
death, electric shock, serious injury, re, or damage to the appliance.
• To reduce the risk of electric shock, do not touch the control switch or service switch
with damp hands.
• Before Servicing the KMS or SRK: To reduce the risk of electric shock, move
the control switch to the "OFF" position and turn off the power supply to the
SRK condensing unit. Place the KMS disconnect (if applicable) in the "OFF"
position. Lockout/Tagout to prevent the power supply from being turned back on
inadvertently.
• Do not make any alterations to the icemaker. Alterations could result in electric
shock, injury, re, or damage to the icemaker.
• This appliance is not intended for use by persons (including children) with reduced
physical, sensory, or mental capabilities, or lack of experience and knowledge,
unless they have been given supervision or instruction concerning use of the
appliance by a person responsible for their safety.
• Children should be properly supervised around this appliance.
• Do not climb, stand, or hang on the icemaker or allow children or animals to do so.
Serious injury could occur or the icemaker could be damaged.
• Do not use combustible spray or place volatile or ammable substances near the
icemaker. They might catch re.
• Keep the area around the icemaker clean. Dirt, dust, or insects in the icemaker
could cause harm to individuals or damage to the icemaker.
5
WARNING, continued
• Power supply and ground connection are supplied from the SRK remote condensing
For KMS
unit via the wire harness provided. Do not connect the wire harness leads to an
external power source.
• Wire harness routing (conduit) and disconnect (if required) must meet national,
state, and local electrical code requirements. Failure to meet these code
requirements could result in death, electric shock, serious injury, re, or damage to
the appliance.
• THE ICEMAKER MUST BE GROUNDED. Failure to properly ground the icemaker
could result in death, serious injury, or damage to the appliance.
For SRK
• Electrical connection must be hard-wired and must meet national, state, and local
electrical code requirements. Failure to meet these code requirements could result
in death, electric shock, serious injury, re, or damage to the appliance.
• The remote condensing unit requires an independent power supply of proper
capacity. See the nameplate for electrical specications. Failure to use an
independent power supply of proper capacity can result in a tripped breaker, blown
fuses, damage to existing wiring, or component failure. This could lead to heat
generation or re.
• THE REMOTE CONDENSING UNIT MUST BE GROUNDED. Failure to properly
ground the remote condensing unit could result in death, serious injury, or damage
to the appliance.
NOTICE
• Follow the instructions in this manual carefully to reduce the risk of costly water
damage.
• In areas where water damage is a concern, install in a contained area with a oor
drain.
• Install the icemaker in a location that stays above freezing. Normal operating
ambient temperature must be within 45°F to 100°F (7°C to 38°C).
• Do not leave the icemaker on during extended periods of non-use, extended
absences, or in sub-freezing temperatures. To properly prepare the icemaker for
these occasions, follow the instructions in "VI.C. Preparing the Icemaker for Periods
of Non-Use."
• Do not place objects on top of the icemaker.
• The dispenser unit/storage bin is for ice use only. Do not store anything else in the
dispenser unit/storage bin.
6
I. Specications
A. Icemaker
1. KMS-1401MLJ with SRK-14J
AC SUPPLY VOLTAGE 115VAC Supplied by SRK-14J via Factory Supplied
Wire Harness
APPROXIMATE ICE PRODUCTION Ambient WATER TEMP. (°F)
PER 24 HR. Temp.(°F) 50 70 90
lb./day ( kg/day ) 70 *1420 (644) 1379 (626) 1278 (580)
Reference without *marks 80 1389 (630) 1325 (601) 1199 (544)
90 1379 (626) *1280 (581) 1162 (527)
100 1344 (609) 1252 (568) 1054 (478)
SHAPE OF ICE Crescent Cube
ICE PRODUCTION PER CYCLE 25.8 lb. (11.7 kg) 1248pcs.
ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F
KMS/SRK COMBINED ELECTRIC W (kWH/100 lb.) 2510(4.70) 2410(4.07)
WATER gal./24HR (gal./100 lb.) 250(19.5) 682(48.0)
CEE TIER 1
ENERGY STAR YES
EXTERIOR DIMENSIONS (WxDxH) 30"x24"x28" (762x610x711 mm)
EXTERIOR FINISH Stainless Steel, Galvanized Steel (Rear)
WEIGHT Net 143 lb. (65 kg), Shipping 177 lb. (80 kg)
CONNECTIONS - ELECTRIC Wire Harness Connection from SRK to KMS
- WATER SUPPLY Inlet 1/2" FPT
- DRAIN Outlet 3/4" FPT
-CONDENSATION DRAIN OUTLET 5/8" OD Hard Tube
-REFRIGERATION Liquid Line 1 1/16" - 12 UNF Fitting (#10 Parker)
Suction Line 1 1/8" - 12 UNF Fitting (#11 Parker)
CUBE CONTROL SYSTEM Float Switch
HARVESTING CONTROL SYSTEM Hot Gas and Water, Thermistor and Timer
ICE MAKING WATER CONTROL Timer Controlled, Overflow Pipe, and Float Switch
COOLING WATER CONTROL N/A
BIN CONTROL SYSTEM Mechanical Bin Control
COMPRESSOR In SRK
CONDENSER Air-Cooled Remote Condensing Unit SRK-14J
EVAPORATOR Vertical Type, Stainless Steel and Copper
REFRIGERANT CONTROL Thermostatic Expansion Valve
Headmaster (C.P.R.) in SRK-14J (160 PSI)
REFRIGERANT CHARGE R404A, 16 lb. 5 oz. (7400g)
(Icemaker 0 lb. 7.1 oz. (200g))
(Cond. Unit 15 lb. 14 oz. (7200g))
DESIGN PRESSURE High 467PSIG, Low 230PSIG
CONTROL BOARD CIRCUIT PROTECTION High Voltage Cut-Out (Internal)
REFRIGERANT CIRCUIT PROTECTION Auto-Reset High-Pressure Switch in SRK-14J
Auto-Reset Discharge Line Thermostat in SRK-14J
LOW W ATER PROTECTION Float Switch
ACCESSORIES -SUPPLIED N/A
-REQUIRED Dispenser Unit or Ice Storage Bin
SRK-14J Remote Condensing Unit
OPERATING CONDITIONS VOLTAGE RANGE 187-253VAC
AMBIENT TEMP. 45-100°F
WATER SUPPLY TEMP. 45-90°F
WATER SUPPLY PRESSURE 10-113 PSIG
Note: We reserve the right to make changes in specications and design without prior
notice.
7
2. KMS-1401MLJ with SRK-14J3
Data Pending
Note: We reserve the right to make changes in specications and design without prior
notice.
8
B. Condensing Unit
1. SRK-14J
AC SUPPLY VOLTAGE 208-230/60/1 ( 3 wire with neutral for 115V )
(115VAC Supplied to KMS via Factory Wire Harness)
AMPERAGE 13.5 A ( 5 Min. Freeze AT 104°F / WT 80°F )
MINIMUM CIRCUIT AMPACITY 20 A
MAXIMUM FUSE SIZE 20 A
EXTERIOR DIMENSIONS (WxDxH) 50" x 17" x 28" ( 1270 x 432 x 711 mm )
DIMENSIONS INCLUDING LEGS (WxDxH) 52-3/8" x 19-1/2" x 43" ( 1330 x 495 x 1092 mm )
EXTERIOR FINISH Galvanized steel
WEIGHT Net 230 lb. (104 kg) Shipping 275 lb. (125 kg)
CONNECTIONS - ELECTRIC Main Power Supply: Permanent Connection
SRK to KMS: Wire Harness Connection
- REFRIGERANT
COMPRESSOR Hermetic, Model CS16K6E-PFV-255
CONDENSER Air Cooled, Fin and Tube Type
COMPRESSOR PROTECTION Auto-Reset Overload Protector (Internal)
FAN MOTOR PROTECTION Thermal Protection
REFRIGERANT CIRCUIT PROTECTION Auto-Reset High-Pressure Switch
REFRIGERANT CONTROL Headmaster (C.P.R.) (160 PSI)
REFRIGERANT CHARGE 16 lb. 5 oz. (7400g))
DESIGN PRESSURE High 467 PSIG, Low 230 PSIG
OPERATING CONDITIONS VOLTAGE RANGE 187 - 253VAC
ACCESSORIES -SUPPLIED Leg 2 pcs
Liquid Line 1 1/16" - 12 UNF Fitting (#10 Parker)
Suction Line 1 1/8" - 12 UNF Fitting (#11 Parker)
Auto-Reset Discharge Line Thermostat
(Condensing Unit 15 lb. 14 oz. (7200g))
(Icemaker 0 lb. 7.1 oz. (200g))
AMBIENT TEMP. (Outdoor use) -20 - 122°F
Hex Head Bolt w/Washer M8x16 8 pcs
Hex Nut M8 8 pcs
-REQUIRED Compatible KMS Icemaker
Note: We reserve the right to make changes in specications and design without prior
notice.
9
2. SRK-14J3
Data Pending
Note: We reserve the right to make changes in specications and design without prior
notice.
10
II. General Information
A. Construction
1. Icemaker
Harvest Water Valve (WV2)
Spray Tubes
Wash Valve
Hot Gas Valve
Liquid Line Valve
Service Valve
(High Side)
Drier
Service Valve
(Low Side)
Thermistor
Fill/Rell Water Valve (WV1)
Control Switch
Service Switch
Fuse
Switch Box
Drain Water Valve
Switch Cover
Switch Mount
Extension Bracket
Control Board
Control Box
Pump Motor
Float Switch
Bin Control
Switch Bracket
11
Bin Control
2. Condensing Unit
SRK-14J Control Box SRK-14J3 Control Box
Fuse
Condenser
Headmaster (C.P.R.)
Hot Gas Valves
Liquid Line Valve
Fuse
Shut-Off Valve
(Low Side)
Check Valve
Receiver
Fan Motors and Fan Blades
Shut-Off Valve (High Side)
High Pressure Switch
Compressor
Accumulator
Thermostat (Discharge Pipe)
12
B. Sequence of Operation
1. Sequence Cycles and Shutdown
The steps in the sequence are as outlined below. When power is supplied, the red
"POWER OK" LED and the green "BC CLOSED" LED on the CB turn on (If yellow
"BC OPEN" LED is on, the icemaker will not start. In this case clear ice away from BC
actuator paddle in the storage bin area). A 5-second delay occurs at startup. Note that
the order of the green sequence LEDs from the outer edge of the board is 1, 4, 3, 2.
a) 1-Minute Fill Cycle
LED 4 is on. WV1 opens and the ll period begins. After 1-minute, CB checks for closed
F/S. If F/S is closed, the harvest cycle begins. If not, WV1 will remain energized through
additional 1-minute cycles until water enters the water tank and F/S closes. This serves
as a low water safety to protect the water pump.
b) Initial Harvest Cycle
LEDs 1, 4 and 2 are on. Comp, FMRs, HGVs, X10 relay, WV2, X12 relay, and X13
relay energize. WV1 de-energizes. CBmonitors the warming of the evaporator via the
thermistor located on the suction line. When the thermistor reaches 48°F (9°C), CB
reads 3.9 kΩ from the thermistor and turns harvest termination over to the adjustable
harvest timer (S4 dip switch1 & 2). The harvest timer has settings of 60, 90, 120, and
180 seconds. The pump-out timer (S4 dip switch 3&4) acts in place of the harvest timer
during cycles with a pump-out (S4 dip switch 5&6). WV2 and X12 relay are energized
during harvest for a maximum of 6 minutes or the length of harvest minus 50 seconds,
whichever is shorter. 50seconds before the harvest timer terminates, harvest pump timer
starts. LED 4 turns off, WV2 and X12 relay de-energize.
Harvest Pump Timer: LEDs 1, 3, and 2 are on. Comp, FMRs, HGVs, X10 relay, and
X13 relay continue. LED 4 turns off, WV2 and X12 relay de-energize. LED 3 turns on and
X11 relay energizes, allowing PM to energize for the last 50 seconds of harvest. NOTICE!
S4 dip switch 7must remain in the factory default position of 7 on. Otherwise,
PM will not energize during the last 50 seconds of harvest. The minimum total
time allowed by CB for a complete harvest cycle is 2 minutes. At the end of harvest,
CB checks position of F/S and proceeds to the freeze cycle if it is closed or calls for a
1-minute ll if it is open.
c) Freeze Cycle
LED 1 and LED 4 are on. Comp, FMRs, and PM remain energized. LLVs energize. WV1
and LED 4 energize for 1 min. HGVs, X10, X11, and X13 relays de-energize. For the rst
5 minutes, CB will not terminate the freeze cycle. At the end of 5 minutes, F/S assumes
control of the freeze cycle. As ice builds on the evaporator, the water level in the water
tank lowers. Freeze continues until F/S opens, provided the 5-minute minimum freeze
timer has terminated.
13
d) Pump-Out Cycle
LEDs 1, 3, and 2 are on. Comp and FMRs remain energized, HGVs and X10 relay
energize. LLVs de-energize. PM stops for 2 seconds, then X11 relay energizes, allowing
PM and DV to energize for 10 or 20 seconds (S4 dip switch 3 & 4). Water is removed
from the bottom of the water tank and sent down the drain. At the same time, water ows
through the small F/S tube to power ush F/S. When the pump-out timer terminates,
pump-out is complete.
The 1st pump-out occurs after the 11th freeze cycle, then every 10th cycle thereafter.
The pump-out frequency control is factory set, and generally no adjustment is required.
However, where water quality is bad and the icemaker needs a pump-out more often,
the pump-out frequency can be adjusted. The pump-out frequency control (S4dip
switch5&6) can be set to have a pump-out occur every cycle, or every 2, 5, or
10cycles. Timing of the rst pump-out is dependent on S4dip switch 5 & 6 settings. See
the table below.
S4 Dip Switch Setting
No. 5 No. 6
OFF OFF Every cycle After 2nd freeze cycle
ON OFF Every 2 cycles After 3rd freeze cycle
OFF ON Every 5 cycles After 6th freeze cycle
ON ON Every 10 cycles After 11th freeze cycle
Pump-Out
Frequency
1st Pump-Out
e) Harvest Cycle
LEDs 1, 4, and 2 are on. Same as the initial harvest cycle. See "II.B.1.b) Initial Harvest
Cycle."
Note: Icemaker continues to cycle until BC is satised or power is turned off. The
icemaker always restarts at the 1-minute ll cycle.
f) Shutdown
When BC is activated (BC open), the yellow "BC OPEN" LED comes on. The icemaker
then shuts down as outlined in the table below.
Cycle at Bin
Control Activation
Fill Cycle 15 seconds after activation.
Harvest Cycle At the end of the harvest cycle, or up to 15 seconds into the freeze cycle if activated
Freeze Cycle 15 seconds after activation if activated at least 15 seconds before the 5-minute short
Shutdown
at the end of the harvest cycle.
cycle protection timer terminates. Otherwise, at the end of the next harvest cycle.
Legend: CB–control board; Comp–compressor; DV–drain valve; FMRs –fan
motors-remote; F/S–oat switch; HGVs–hot gas valves; LLVs–liquid line
valves; PM–pump motor; WV1–ll/rell water valve; WV2–harvest water valve
14
2. Sequence Flow Chart
Factory set forevery
10th cycle.
(S4 dip switch 5 & 6)
4. Pump-Out Cycle
Comp continues
FMRs continue
HGVs energized
DV & PM de-energized 2 sec., then
energized for 10/20sec.
To 1 above
LLVs de-energized
"G" Control Board Sequence Flow Chart
KMS-1401MLJ with SRK-14J/3
3. Freeze Cycle
• Minimum freeze time: 5 min.
• Maximum freeze time: freeze timer setting
(S4 dip switch 9 & 10).
F/S in control
5-min. minimum
freeze timer in
1 to 3-min. harvest timer in control
(S4 dip switch 1 & 2)
control
Rell
HarvestPump
Timer
F/S closed
1 min.
50 sec.
F/S opens or freeze
timer terminates
Comp continues
FMRs continue
PM continues
LLVs energized
WV1 energized rst 1 min. of freeze
HGVs de-energized
F/S check
PM energized
WV2 de-energized
Thermistor temperature reaches
48°F (9°C) (3.9 kΩ or less).
Harvest timer starts (1 to 3 min.).
F/S open
3. Ice Level Lowered
2. Icemaker Off
Icemaker starts at "1. 1-Minute Fill Cycle."
BC closed (BC actuator paddle disengaged)
Green "BC CLOSED" LED on
Yellow "BC OPEN" LED off
All components
de-energized.
Yellow "BC OPEN" LED continues
All components de-energized
Power is supplied to the pump and drain valve. This drains the water tank.
Power is supplied to the pump only. This operation can be used to circulate cleaner and
sanitizer over the outside surface of the evaporator for extended periods of time.
Power is supplied to the pump and wash valve. This operation is used to circulate cleaner
and sanitizer over both the inside and outside surfaces of the evaporator.
DRAIN
CIRC.
Components Energized when the Control Switch is in the "SERVICE" Position
When in the "SERVICE" position, the control switch supplies power to the service switch and the icemaker is in service mode.
The service switch has three positions: "DRAIN," "CIRC." and "WASH." See the information below for details of each function.
WASH
Thermistor
(S4 dip switch 7), whichever is shorter.
• WV2 time: 6 min. or the length of harvest minus 50 sec.
• Maximum harvest time: 20 min.
2. Harvest Cycle
1. 1-Minute
Fill Cycle
Cycle
Steps
in control
F/S closed
Startup
Comp energized
FMRs energized
HGVs energized
WV2 energized
WV1 de-energized
freeze cycle if activated at the end of the harvest cycle.
• Fill Cycle – 15 sec. after activation.
Shutdown Delay:
F/S check
F/S open
WV1 energized
1. Bin Full
If F/S is open, Comp stops and cycle returns to 1-min. ll.
Shutdown
andRestart
the 5-min. short cycle protection timer terminates.
• Harvest Cycle – At the end of the harvest cycle, or up to 15 sec. into the
• Freeze Cycle – 15 sec. after activation if activated at least 15 sec. before
Otherwise, at the end of the next harvest cycle.
BC open (BC actuator paddle engaged)
Green "BC CLOSED" LED off
Yellow "BC OPEN" LED on
BC Operation
Legend:
Comp-compressor
DV-drain valve
FMRs-fan motors-remote
F/S-oat switch
HGVs-hot gas valves (KMS and SRK)
LLVs-liquid line valves (KMS and SRK)
PM-pump motor
WV1-ll/rell water valve
WV2-harvest water valve
15
C. Control Board
• A Hoshizaki exclusive control board is employed in the Hoshizaki icemakers.
• All models are pretested and factory adjusted.
• For a control board check procedure, see "IV.B. Control Board Check."
NOTICE
• Fragile, handle very carefully.
• The control board contains integrated circuits, which are susceptible to failure
due to static discharge. It is especially important to touch the metal part of the
icemaker when handling or replacing the control board.
• Do not touch the electronic devices on the control board or the back of the control
board.
• Do not change wiring and connections. Do not misconnect terminals.
• Do not short out power supply to test for voltage.
• Always replace the whole control board assembly if it goes bad.
16
1. Control Board Layout
"G" Control Board
• "ALARM RESET" Button • S4 Dip Switch
• Bin Control Switch
Closed LED (green)
• Bin Control Switch
Open LED (yellow)
• Part Number
• Alarm Buzzer
• Power LED (red)
(lights when
10.5VAC is supplied
to K2 connector)
• Relay LEDs
(4) (indicate which
relays are energized
and which K1
connector pins are
energized
• LED 2 (X2 Relay)
LED 2 on:
K1 Connector Pin #2
LED 2 off:
K1 Connector Pin #3
• LED 3 (X3 Relay)
LED 3 on:
K1 Connector Pin #5
(energized during harvest
pump timer)
LED 3 off:
K1 Connector Pin #4
(energized in freeze)
• LED 4 (X4 Relay)
K1 Connector Pin #6
• LED 1 (X1 Relay)
K1 Connector Pin #1, #9
• K2 Connector
Control Transformer
(10.5VAC)
• "OUTPUT TEST" Button
(used to test relays on control board)
• K3 (white) Connector
Harvest Control
(thermistor)
• K4 (red) Connector
Bin Control
• S5 Dip Switch
• K5 (black) Connector
Float Switch
• Label
(control board revision
level indicated on label
on side of relay)
• K1 Connector
Pins #1 through #10
#1, 9 Magnetic Contactor,
X13 Relay (holding
circuit during Harvest
Pump Timer), and
Drain Valve (during
Pump-Out)
#2 Hot Gas Valves (KMS and
SRK) and X10 Relay
#3 Liquid Line Valves
#4 Pump Motor (freeze)
#5 X11 Relay (Pump Motor
in Harvest Pump Timer
and Drain Valve in
Pump-Out)
#6 Fill Water Valve (InitialFill
and Freeze Fill only);
Harvest WaterValve and
X12 Relay (Harvest only)
#7, 10 Supply Voltage
#8 Open
"G" Control Board
Part Number 2A3792-01
17
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