Hoshizaki Serenity Series KMS-1401MLJ User manual

Hoshizaki
“A Superior Degree
of Reliability”
www.hoshizaki.com
Model
KMS-1401MLJ
Including
Condensing Unit Models
SRK-14J/3
Modular Crescent Cuber
Serenity Series
Hoshizaki America, Inc.
Number: 73192
Issued: 12-28-2011
SERVICE MANUAL

2
WARNING
Only qualied service technicians should install and service the icemaker. To
obtain the name and phone number of your local Hoshizaki Certied 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 qualied 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: [phone]
Fax: [phone]
E-mail: [email protected]
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.

3
CONTENTS
Important Safety Information ................................................................................................. 5
I. Specications...................................................................................................................... 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) Rell Counter (S5 dip switch 2 through 5)......................................................... 22
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.

4
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

5
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 qualied 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.

6
WARNING, continued
For KMS
• Power supply and ground connection are supplied from the SRK remote condensing
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 specications. 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.

7
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 WATER 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
I. Specications
A. Icemaker
1. KMS-1401MLJ with SRK-14J
Note: We reserve the right to make changes in specications and design without prior
notice.

8
2. KMS-1401MLJ with SRK-14J3
Note: We reserve the right to make changes in specications and design without prior
notice.
Data Pending

9
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 Liquid Line 1 1/16" - 12 UNF Fitting (#10 Parker)
Suction Line 1 1/8" - 12 UNF Fitting (#11 Parker)
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
Auto-Reset Discharge Line Thermostat
REFRIGERANT CONTROL Headmaster (C.P.R.) (160 PSI)
REFRIGERANT CHARGE 16 lb. 5 oz. (7400g))
(Condensing Unit 15 lb. 14 oz. (7200g))
(Icemaker 0 lb. 7.1 oz. (200g))
DESIGN PRESSURE High 467 PSIG, Low 230 PSIG
OPERATING CONDITIONS VOLTAGE RANGE 187 - 253VAC
AMBIENT TEMP. (Outdoor use) -20 - 122°F
ACCESSORIES -SUPPLIED Leg 2 pcs
Hex Head Bolt w/Washer M8x16 8 pcs
Hex Nut M8 8 pcs
-REQUIRED Compatible KMS Icemaker
B. Condensing Unit
1. SRK-14J
Note: We reserve the right to make changes in specications and design without prior
notice.

10
2. SRK-14J3
Note: We reserve the right to make changes in specications and design without prior
notice.
Data Pending

11
II. General Information
A. Construction
1. Icemaker
Spray Tubes Hot Gas Valve
Liquid Line Valve
Service Valve
(High Side)
Drier
Wash Valve
Service Valve
(Low Side)
Fill/Rell Water Valve (WV1)
Control Board
Pump Motor
Float Switch
Drain Water Valve
Control Switch
Service Switch
Harvest Water Valve (WV2)
Thermistor
Control Box
Bin Control
Extension Bracket
Switch Cover Switch Bracket
Switch Mount
Bin Control
Fuse
Switch Box

12
2. Condensing Unit
Condenser
Headmaster (C.P.R.)
Hot Gas Valves
Liquid Line Valve
Receiver
Accumulator
Shut-Off Valve
(Low Side)
Thermostat (Discharge Pipe)
Compressor
Shut-Off Valve (High Side)
Fan Motors and Fan Blades
Check Valve
High Pressure Switch
SRK-14J Control Box SRK-14J3 Control Box
Fuse Fuse

13
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. CBmonitors 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 switch1 & 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. 50seconds 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 7must 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.

14
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 (S4dip
switch5&6) can be set to have a pump-out occur every cycle, or every 2, 5, or
10cycles. Timing of the rst pump-out is dependent on S4dip switch 5 & 6 settings. See
the table below.
S4 Dip Switch Setting Pump-Out
Frequency 1st Pump-Out
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
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 satised 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
Shutdown
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
at the end of the harvest cycle.
Freeze Cycle 15 seconds after activation if activated at least 15 seconds before the 5-minute short
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/rell water valve; WV2–harvest water valve

15
• Minimum freeze time: 5 min. • Maximum freeze time: freeze timer setting (S4 dip switch 9 & 10).
2. Sequence Flow Chart
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.
DRAIN Power is supplied to the pump and drain valve. This drains the water tank. CIRC. 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.
WASH 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.
4. Pump-Out Cycle
1. 1-Minute Fill Cycle
2. Harvest Cycle 3. Freeze Cycle
Cycle Steps
WV1 energized
F/S open
F/S closed
Comp energized FMRs energized HGVs energized WV2 energized WV1 de-energized
Thermistor temperature reaches 48°F (9°C) (3.9 kΩor less). Harvest timer starts (1 to 3 min.).
F/S open
Comp continues FMRs continue PM continues LLVs energized WV1 energized rst 1 min. of freeze HGVs de-energized
F/S closed
Comp continues FMRs continue HGVs energized DV & PM de-energized 2 sec., then energized for 10/20sec. LLVs de-energized
F/S check
F/S check
• WV2 time: 6 min. or the length of harvest minus 50 sec.
(S4 dip switch 7), whichever is shorter.
• Maximum harvest time: 20 min.
Thermistor in control
1 to 3-min. harvest timer in control (S4 dip switch 1 & 2) 5-min. minimum
freeze timer in control
F/S in control
Startup
If F/S is open, Comp stops and cycle returns to 1-min. ll.
Factory set forevery 10th cycle. (S4 dip switch 5 & 6)
50 sec.
PM energized WV2 de-energized
HarvestPump Timer
F/S opens or freeze timer terminates
1. Bin Full
Shutdown Delay:
• Fill Cycle – 15 sec. after activation. • Harvest Cycle – At the end of the harvest cycle, or up to 15 sec. into the
freeze cycle if activated at the end of the harvest cycle.
• Freeze Cycle – 15 sec. after activation if activated at least 15 sec. before
the 5-min. short cycle protection timer terminates.
Otherwise, at the end of the next harvest cycle.
Shutdown andRestart
BC Operation
BC open (BC actuator paddle engaged) Green "BC CLOSED" LED off Yellow "BC OPEN" LED on
Yellow "BC OPEN" LED continues All components de-energized
2. Icemaker Off All components de-energized.
3. Ice Level Lowered
Icemaker starts at "1. 1-Minute Fill Cycle."
To 1 above
BC closed (BC actuator paddle disengaged) Green "BC CLOSED" LED on Yellow "BC OPEN" LED off
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/rell water valve WV2-harvest water valve
"G" Control Board Sequence Flow Chart
KMS-1401MLJ with SRK-14J/3
1 min.
Rell

16
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.

17
1. Control Board Layout
"G" Control Board
Part Number 2A3792-01
"G" Control Board
• Power LED (red)
(lights when
10.5VAC is supplied
to K2 connector)
• 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)
• S5 Dip Switch
• Bin Control Switch
Closed LED (green)
• "ALARM RESET" Button • S4 Dip Switch • "OUTPUT TEST" Button
(used to test relays on control board)
• K3 (white) Connector
Harvest Control
(thermistor)
• K4 (red) Connector
Bin Control
• Label
(control board revision
level indicated on label
on side of relay)
• K5 (black) Connector
Float Switch
• Part Number
• Bin Control Switch
Open LED (yellow)
• Alarm Buzzer
• LED 2 (X2 Relay)
LED 2 on:
K1 Connector Pin #2
LED 2 off:
K1 Connector Pin #3
• Relay LEDs
(4) (indicate which
relays are energized
and which K1
connector pins are
energized
• 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 (InitialFill
and Freeze Fill only);
Harvest WaterValve and
X12 Relay (Harvest only)
#7, 10 Supply Voltage
#8 Open

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2. LED Lights and Audible Alarm Safeties
At startup, a 5-second delay occurs while the control board conducts an internal timer
check. A beep occurs when the control switch is moved to the "ICE" position. The red
LED indicates proper control voltage and remains on unless a control voltage problem
occurs. The green LEDs 1 through 4 energize and sequence from initial startup as listed
in the table below. Note that the order of the LEDs from the outer edge of the control
board is 1, 4, 3, 2. For details, see "II.B. Sequence of Operation."
Sequence Step LED Energized
Components
Time LEDs are On
Min. Max. Avg.
1-Minute Fill Cycle 4 WV1 1 minute
Harvest Cycle 1, 4, 2 Comp, FMRs
WV2, HGVs
2 minutes 20 minutes 3 to 5 minutes
Harvest Pump Timer 1, 3, 2 Comp, FMRs,
PM, HGVs
0 seconds 50 seconds harvest pump
timer setting
Freeze Cycle 1 (and 4 for rst
1 min.)
Comp, FMRs,
PM, LLVs
(WV1 for rst 1
min.)
5 minutes freeze timer
setting
30 to 35 minutes
Pump-Out Cycle 1, 3, 2 Comp, FMRs,
PM, HGVs, DV
10 seconds 20 seconds
The built in safeties shut down the icemaker and have alarms as listed below.
No. of Beeps
(every 3 sec.) Type of Alarm Notes
1High Evaporator Temp.
(temperature > 127°F (53°C))
Check for harvest problem (stuck HGVs or relay), hot
water entering icemaker, stuck HM, or shorted thermistor.
2Harvest Backup Timer
(harvest > 20 min. for two cycles
in a row)
Check for open thermistor, HGVs not opening, TXVs or
LLVs leaking by, low charge, or inefficient Comp.
3Freeze Timer
(freeze > specied setting for
two cycles in a row)
Timer is factory set using S4 dip
switch 9 & 10
Check for a F/S stuck closed (up), WV1 or WV2 leaking
by, HGVs leaking by, PM not pumping, TXVs not
feeding properly, LLVs not opening, low charge, HM not
bypassing, or inefficient compressor.
To reset the above safeties, press the "ALARM RESET" button with the power supply on.
6Low Voltage
(92Vac±5% or less)
Red LED will turn off if voltage protection operates.
The control voltage safeties automatically reset when
voltage is corrected.
7High Voltage
(147Vac±5% or more)
Legend: Comp–compressor; DV–drain valve; FMRs–fan motors-remote;
F/S–oat switch; HGVs–hot gas valves; HM–headmaster (C.P.R.);
LLVs–liquid line valves; PM–pump motor; TXVs–thermostatic expansion
valves; WV1–ll/rell water valve; WV2–harvest water valve

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3. Controls and Adjustments
NOTICE
Dip switches are factory set. Failure to maintain factory settings may adversely
affect performance and warranty coverage. For more information, contact Hoshizaki
Technical Support at 1-800-233-1940.
a) Default Dip Switch Settings
The dip switches are factory-adjusted to the following positions:
S4 Dip Switch
Dip Switch No. 1 2 3 4 5 6 7 8 9 10
KMS-1401MLJ OFF OFF OFF ON ON ON ON OFF OFF OFF
S5 Dip Switch (Do Not Adjust)
Dip Switch No. 1 2 3 4 5
KMS-1401MLJ ON ON OFF OFF OFF
b) Harvest Timer (S4 dip switch 1 & 2)
The harvest timer starts counting when the thermistor reads 48°F (9°C) at the evaporator
outlet and the control board reads the thermistor's 3.9 kΩ signal. The harvest timer is
factory set, and generally no adjustment is required. However, a setting longer than the
factory setting may be advised in cases where the ush provided at harvest needs to be
prolonged for extra cleaning. Before changing this setting, contact Hoshizaki Technical
Support at 1-800-233-1940 for recommendations. Keep in mind that setting the harvest
timer to a longer setting decreases 24-hour production.
Note that the pump-out timer (S4dip switch 3 & 4) acts in place of the harvest timer
during cycles with a pump-out. For details, see "II.C.3.c) Pump-Out Timer (S4 dip switch
3 & 4)."
Dip Switch Setting Time (seconds)
No. 1 No. 2
OFF OFF 60
ON OFF 90
OFF ON 120
ON ON 180
1 2 3 4 5
ON
1 2 3 4 5 6 7 8 9 10
ON
Freeze Timer (9 & 10)
Pump-Out Frequency Control (5 & 6)
Pump-Out Timer (3 & 4)
Harvest Timer (1 & 2)
Harvest Pump Timer (7) (Do not adjust)
Factory Use (8)
S4 Dip Switch
Do Not Adjust
S5 Dip Switch
Rell Counter
(2 through 5)
Float Switch
Selector (1)

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c) Pump-Out Timer (S4 dip switch 3 & 4)
The 1st pump-out occurs after the 11th freeze cycle, then every 10th cycle thereafter.
When a pump-out is called for, the X10relay is energized and the X13 relay is
de-energized to allow the drain valve to energize. The pump motor stops for 2seconds,
then the X11 relay energizes, allowing the pump motor and drain valve to energize.
Water is removed from the bottom of the water tank and sent down the drain. At the
same time, water ows through the small oat switch tube to power ush the oat switch.
The pump-out drains the water tank for the time determined by the pump-out timer. The
pump-out timer also acts in place of the harvest timer during cycles with a pump-out. The
pump-out timer is factory set, and generally no adjustment is required. The pump-out
timer control can be set to pump-out for 10 or 20 seconds.
S4 Dip Switch Setting Time (seconds) Inlet Water Valve
No. 3 No. 4 T1 T2
OFF OFF 10 150 closed
ON OFF 10 180 closed
OFF ON 10 120 open if rell = 0; closed if rell 1 or greater
ON ON 20 180 closed
T1: Time to drain the water tank
T2: Harvest timer at pump-out
d) Pump-Out Frequency Control (S4 dip switch 5 & 6)
The pump-out frequency control is factory-adjusted to drain the water tank every
10cycles, and generally no adjustment is required. However, where water quality is bad
and the icemaker needs a more frequent pump-out, the pump-out frequency can be
adjusted as shown in the table below.
Timing of the rst pump-out is dependent on S4 dip switch 5 & 6 settings. See the table
below.
S4 Dip Switch Setting Pump-Out
Frequency 1st Pump-Out
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