Hoshizaki KMS-830MLH User manual

Hoshizaki

“A Superior Degree

of Reliability”

www.hoshizaki.com

Model

KMS-830MLH

Including

Condensing Unit Models

SRK-8H/3

Modular Crescent Cuber

Serenity Series

Hoshizaki America, Inc.

SERVICE MANUAL

™

Number: 73185

Issued: 7-27-2011

2

IMPORTANT

Only qualied service technicians should install, service, and maintain the

icemaker. No service or maintenance should be undertaken until the technician

has thoroughly read this Service Manual. Failure to service and maintain

the equipment in accordance with this manual may adversely affect safety,

performance, component life, and warranty coverage.

Hoshizaki provides this manual primarily to assist qualied service technicians in the

service and maintenance of the icemaker.

Should the reader have any questions or concerns which have not been satisfactorily

addressed, please call, write, or send an e-mail message to the Hoshizaki Technical

Support Department for assistance.

HOSHIZAKI AMERICA, INC.

618 Highway 74 South

Peachtree City, GA 30269

Attn: Hoshizaki Technical Support Department

Phone: 1-800-233-1940 Technical Support

(770) 487-2331

Fax: 1-800-843-1056

(770) 487-3360

E-mail: techsuppor[email protected]

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

B. Condensing Unit ............................................................................................................ 9

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 Control (S5 dip switch 1) ............................................................ 22

i) Rell Counter (S5 dip switch 2 through 5) ......................................................... 22

D. Control Switch ............................................................................................................. 22

III. Technical Information ...................................................................................................... 23

A. Water Circuit and Refrigeration Circuit ........................................................................ 23

B. Wiring Diagram ............................................................................................................ 24

C. Performance Data ....................................................................................................... 26

IMPORTANT

This manual should be read carefully before the icemaker is serviced or

maintenance operations are performed. Only qualied service technicians

should install, service, and maintain the icemaker. Read the warnings contained

in this booklet carefully as they give important information regarding safety.

Please retain this booklet for any further reference that may be necessary.

4

IV. Service Diagnosis .......................................................................................................... 28

A. Diagnostic Procedure ................................................................................................. 28

B. Control Board Check ................................................................................................... 32

C. Bin Control Check and Cleaning ................................................................................. 33

1. Bin Control Check .................................................................................................. 33

2. Bin Control Cleaning .............................................................................................. 35

D. Float Switch Check and Cleaning ............................................................................... 36

1. Float Switch Check ................................................................................................ 36

2. Float Switch Cleaning ............................................................................................ 37

E. Thermistor Check ........................................................................................................ 38

F. Diagnostic Charts ........................................................................................................ 39

1. No Ice Production ................................................................................................... 39

2. Freeze-Up .............................................................................................................. 40

3. Low Ice Production ................................................................................................ 42

V. Replacement of Components .......................................................................................... 43

A. Service for Refrigerant Lines ....................................................................................... 43

1. Refrigerant Recovery ............................................................................................. 43

2. Brazing .................................................................................................................. 44

3. Evacuation and Recharge (R-404A) ...................................................................... 44

B. Important Notes for Component Replacement ............................................................ 46

VI. Cleaning and Maintenance ............................................................................................. 47

A. Cleaning and Sanitizing Instructions ........................................................................... 47

1. Cleaning Procedure ................................................................................................ 48

2. Sanitizing Procedure - Following Cleaning Procedure ........................................... 50

B. Maintenance ................................................................................................................ 51

C. Preparing the Icemaker for Long Storage ................................................................... 51

5

Important Safety Information

Throughout this manual, notices appear to bring your attention to situations which could

result in death, serious injury, or damage to the unit.

WARNING Indicates a hazardous situation which could result in death or

serious injury.

NOTICE Indicates a situation which could result in damage to the unit or

property.

IMPORTANT Indicates important information about the use and care of the

unit.

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.

To reduce the risk of death, electric shock, serious injury, or re, follow

basic precautions including the following:

•Thisunitshouldbedisassembledorrepairedonlybyqualiedservice

personnel to reduce the risk of electric shock, injury, or re.

•Movethecontrolswitchtothe"OFF"positionandturnoffthepowersupplyto

the SRK condensing unit before servicing the KMS or SRK. 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unit.Alterationscouldresultinelectric

shock, injury, re, or damage to the unit.

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

severe damage to equipment.

•THE ICEMAKER MUST BE GROUNDED. Failure to properly ground

the icemaker could result in death, serious injury, or severe damage to

equipment.

6

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 severe damage to

equipment.

•Theremotecondensingunitrequiresanindependentpowersupplyofproper

capacity. See the nameplate for electrical specications. Failure to use a

properly sized breaker or fuse can result in a tripped breaker, blown fuses, or

damage to existing wiring. 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 or serious

injury.

7

I. Specications

A. Icemaker

1. KMS-830MLH with SRK-8H

Note: We reserve the right to make changes in specications and design without prior

notice.

AC SUPPLY VOLTAGE 115VAC Supplied by SRK-8H 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 *820 (372) 785 (356) 737 (334)

Reference without *marks 80 793 (360) 739 (335) 691 (314)

90 785 (356) *700 (318) 652 (296)

100 776 (352) 689 (312) 607 (275)

SHAPE OF ICE Crescent Cube

ICE PRODUCTION PER CYCLE 13.6 lb. (6.2 kg) 680pcs.

ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F

KMS/SRK COMBINED ELECTRIC W (kWH/100 lb.) 1600(5.50) 1560(4.57)

WATER gal./24HR (gal./100 lb.) 112(16.0) 348(42.4)

CEE TIER LEVEL 1

ENERGY STAR YES

EXTERIOR DIMENSIONS (WxDxH) 30"x16.5"x29" (762x420x737 mm)

EXTERIOR FINISH Stainless Steel, Galvanized Steel (Rear)

WEIGHT Net 112 lb. (51 kg), Shipping 137 lb. (62 kg)

CONNECTIONS - ELECTRIC Wire Harness Connection from SRK to KMS

- WATER SUPPLY Inlet 1/2" FPT

- DRAIN Outlet 3/4" FPT

-CONDENSATION 3/8" OD Tube

-REFRIGERATION Liquid Line 1/2" Copper Tube Field Connection

Suction Line 5/8" Copper Tube Field Connection

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-8H

EVAPORATOR Vertical Type, Stainless Steel and Copper

REFRIGERANT CONTROL Thermostatic Expansion Valve

Headmaster (C.P.R.) in SRK-8H (160 PSIG)

REFRIGERANT CHARGE R404A, 13 lb. 10.7 oz. (6200g)

(Icemaker 0 lb. 7.1 oz. (200g))

(Cond. Unit 13 lb. 3.6 oz. (6000g))

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-8

Auto-Reset Discharge Line Thermostat in SRK-8

LOW WATER PROTECTION Float Switch

ACCESSORIES -SUPPLIED N/A

-REQUIRED Dispenser Unit or Ice Storage Bin

SRK-8H 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

ENG.F-011.1.0205

8

2. KMS-830MLH with SRK-8H3

AC SUPPLY VOLTAGE 115VAC Supplied by SRK-8H3 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 *791 (359) 761 (345) 711 (322)

Reference without *marks 80 768 (349) 722 (328) 667 (302)

90 761 (345) *690 (313) 635 (288)

100 748 (339) 677 (307) 585 (265)

SHAPE OF ICE Crescent Cube

ICE PRODUCTION PER CYCLE 12.5 lb. (5.7 kg) 680pcs.

ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F

KMS/SRK COMBINED ELECTRIC W (kWH/100 lb.) 1550(5.40) 1470(4.47)

WATER gal./24HR (gal./100 lb.) 110(16.0) 338(42.7)

CEE TIER LEVEL 1

ENERGY STAR YES

EXTERIOR DIMENSIONS (WxDxH) 30"x16.5"x29" (762x420x737 mm)

EXTERIOR FINISH Stainless Steel, Galvanized Steel (Rear)

WEIGHT Net 112 lb. (51 kg), Shipping 137 lb. (62 kg)

CONNECTIONS - ELECTRIC Wire Harness Connection from SRK to KMS

- WATER SUPPLY Inlet 1/2" FPT

- DRAIN Outlet 3/4" FPT

-CONDENSATION 3/8" OD Tube

-REFRIGERATION Liquid Line 1/2" Copper Tube Field Connection

Suction Line 5/8" Copper Tube Field Connection

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-8H3

EVAPORATOR Vertical Type, Stainless Steel and Copper

REFRIGERANT CONTROL Thermostatic Expansion Valve

Headmaster (C.P.R.) in SRK-8H3 (160 PSI)

REFRIGERANT CHARGE R404A, 13 lb. 10.7 oz. (6200g)

(Icemaker 0 lb. 7.1 oz. (200g))

(Cond. Unit 13 lb. 3.6 oz. (6000g))

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-8H3

Auto-Reset Discharge Line Thermostat in SRK-8H3

LOW WATER PROTECTION Float Switch

ACCESSORIES -SUPPLIED N/A

-REQUIRED Dispenser Unit or Ice Storage Bin

SRK-8H3 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

ENG.F-011.1.0205

Note: We reserve the right to make changes in specications and design without prior

notice.

9

B. Condensing Unit

1. SRK-8H

Note: We reserve the right to make changes in specications and design without prior

notice.

AC SUPPLY VOLTAGE 208-230/60/1 (3 wire with neutral for 115VAC)

(115VAC Supplied to KMS via Factory Wire Harness)

AMPERAGE 9.1 A ( 5 Min. Freeze AT 104°F / WT 80°F )

MINIMUM CIRCUIT AMPACITY 20 A

MAXIMUM FUSE SIZE 20 A

EXTERIOR DIMENSIONS (WxDxH) 33.6"x23"x22.1" (854x585x562 mm)

DIMENSIONS INCLUDING LEGS (WxDxH) 35.7"x25.4"x37.1" (907x645x942 mm)

EXTERIOR FINISH Galvanized steel

WEIGHT Net 176 lb. (80 kg) Shipping 206 lb. (93 kg)

CONNECTIONS - ELECTRIC Main Power Supply: Permanent Connection

SRK to KMS: Wire Harness Connection

- REFRIGERANT Liquid Line 1/2" Copper Tube Field Connection

Suction Line 5/8" Copper Tube Field Connection

COMPRESSOR Hermetic, Model CS10K6E-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 PSIG)

REFRIGERANT CHARGE 13 lb. 10.7 oz. (6200g))

(Condensing Unit 13 lb. 3.6 oz. (6000g))

(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

ENG.F-032.1.0205

10

2. SRK-8H3

AC SUPPLY VOLTAGE 208-230/60/3

(115VAC Supplied to KMS via Factory Wire Harness)

AMPERAGE 7.5 A ( 5 Min. Freeze AT 104°F / WT 80°F )

MINIMUM CIRCUIT AMPACITY 20 A

MAXIMUM FUSE SIZE 20 A

EXTERIOR DIMENSIONS (WxDxH) 33.6"x23"x22.1" (854x585x562 mm)

DIMENSIONS INCLUDING LEGS (WxDxH) 35.7"x25.4"x37.1" (907x645x942 mm)

EXTERIOR FINISH Galvanized steel

WEIGHT Net 176 lb. (80 kg) Shipping 206 lb. (93 kg)

CONNECTIONS - ELECTRIC Main Power Supply: Permanent Connection

SRK to KMS: Wire Harness Connection

- REFRIGERANT Liquid Line 1/2" Copper Tube Field Connection

Suction Line 5/8" Copper Tube Field Connection

COMPRESSOR Hermetic, Model CS10K6E-TF5-255

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 PSIG)

REFRIGERANT CHARGE 13 lb. 10.7 oz. (6200g))

(Condensing Unit 13 lb. 3.6 oz. (6000g))

(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

ENG.F-032.1.0205

Note: We reserve the right to make changes in specications and design without prior

notice.

11

II. General Information

A. Construction

1. Icemaker

Spray Tube

Control Box

Drier

Hot Gas

Valve

Float Switch

Pump Motor

Control Switch

Thermostatic Expansion Valve

Inlet Water Valve

Cleaning Valve

Spray Guide

High-Side Service Valve

Low-Side Service Valve

Liquid Line Valve

Evaporator

Insulation

Fuse (KMS)

Bin Control Cover

Bin Control Extension Bracket

Bin Control

Bin Control Insulation

Strainer

Insulation

Left Side

Panel

12

2. Condensing Unit

Headmaster (C.P.R.)

Control Box

Hot Gas Valve

Condenser Fan Motor

High-Side Service Valve

Low-Side Service Valve

Compressor)

Condenser

Liquid Line Valve

Receiver

Accumulator

Discharge Line Thermostat

High-Pressure Switch

Fuse (SRK)

Control Box Cover

Left Side Panel

Louver Panel

Right Side Panel

Top Panel

13

B. Sequence of Operation

1. Sequence Cycles and Shutdown

The steps in the sequence are as outlined below. When power is supplied, CB red

"POWEROK"LEDandCBgreen"BCCLOSED"LEDturnson.IfCByellow"BCOPEN"

LED is on, the unit will not start. In this case, clear ice away from the BC actuator paddle

in the dispenser unit/storage bin area. A 5-second delay occurs at startup. Note that the

order of the green sequence LEDs from the outer edge of CB is 1,4, 3, 2.

a) 1-Minute Fill Cycle

LED 4 is on. WV and X11 relay energize. After 1 minute, CB checks for a closed F/S. If

F/S is closed, the harvest cycle begins. If open, WV remains energized through additional

1-minute ll cycles until water lls the water tank and closes F/S. This serves as a low

water safety to protect PM.

b) Initial Harvest Cycle

LEDs 1, 4, and 2 are on. WV and X11 relay remain energized, Comp, FMR, HGVs, and

X10 relay energize. 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 a 3.9kΩ signal

from the thermistor and turns harvest termination over to the harvest timer. For details,

see"II.C.3.b)HarvestTimer(S4dipswitch1&2)."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).WVandX11relayareenergizedduring

harvest for a maximum of 6 minutes or the length of harvest minus 50 seconds (harvest

pump timer (S4 dip switch 7)), whichever is shorter. 50 seconds before the harvest timer

terminates, LED 4 turns off, WV and X11 relay de-energize.

Harvest Pump Timer: LEDs 1,3, and 2 are on. LED3turns on and PM energizes.

Fordetails,see"II.C.3.e)HarvestPumpTimer(S4dipswitch7)." 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. When the harvest timer terminates,

the harvest cycle is complete. CB checks the position of F/S and proceeds to the next

cycle if it is closed, or calls for a 1-minute ll cycle if it is open. The minimum total time

allowed by CB for a complete harvest cycle is 2 minutes.

c) Freeze Cycle

LED 1 is on. Comp, FMR, and PM remain energized. LLVs energize, HGVs and

X10relay de-energize. CB 5-minute short cycle protection timer prevents CB from

monitoring F/S for the rst 5 minutes of freeze. After the 5-minute short cycle protection

timer terminates, CB turns freeze termination over to F/S. As ice builds on the evaporator,

the water level in the water tank lowers. The freeze cycle continues until F/S opens. There

is a 15 second delay before CB acknowledges an open F/S and terminates the freeze

cycle.

14

d) Pump-Out Cycle

LEDs 1, 3, and 2 are on. LED 4 is on when S4 dip switch 3 & 4 are set to 3 off and 4 on.

Fordetails,see"II.C.3.c)Pump-OutTimer(S4dipswitch3&4)."NOTICE! Do not

adjust S4 dip switch 3 & 4 to 3 off and 4 on. Adjustment to this position on this

model prevents the pump motor from rotating in the pump-out (reverse) direction.

Comp and FMR remain energized, HGVs energize. LLVs de-energize. PM de-energizes

for 2 seconds, then energizes in reverse direction for 10 seconds. Water is removed

from the bottom of the water tank and sent down the drain through the check valve. 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 pump-out timer and pump-out frequency control are factory set, and generally no

adjustmentis required. However, where water quality is bad and the icemaker needs

a longer and/or more frequent pump-out, the pump-out timer and pump-out frequency

control can be adjusted. The pump-out timer (S4 dip switch 3 & 4) can be set to have a

10or20secondpump-out.Fordetails,see"II.C.3.c)Pump-OutTimer(S4dipswitch3&

4)."Thepump-outfrequencycontrol(S4dipswitch5&6)canbeadjustedasshownin

thetablebelow.Fordetails,see"II.C.3.d)Pump-OutFrequencyControl(S4dipswitch

5&6)."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

Sameastheinitialharvestcycle.See"II.B.1.b)InitialHarvestCycle."

Note: Unit continues to cycle until BC is satised or power is turned off. The unit always

restarts at the 1-minute ll cycle.

f) Shutdown

WhenBCisactivated(BCopen),yellow"BCOPEN"LEDturnson.Theunit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: BC–bin control; CB–control board; Comp–compressor; FMR–fan motor-remote;

F/S–oat switch; HGVs–hot gas valves (KMS and SRK); LLVs–liquid line valves

(KMS and SRK); PM–pump motor; WV–inlet water valve; X10–pump motor

direction relay; X11–X10 control relay

15

2. Sequence Flow Chart

F/S check

1 to 3-min. timer in control

(S4 dip switch 1 & 2)

"G" Control Board Sequence Flow Chart

1. 1-Minute Fill

Cycle

Cycle Steps

2. Harvest Cycle

•WVtime:6min.orthelengthofharvestminus50sec.

(S4 dip switch 7), whichever is shorter. DO NOT

ADJUST S4 dip switch 7.

•Maximumharvesttime:20min.

Thermistor

in control

3. Freeze Cycle

•Minimumfreezetime:5min.

•Maximumfreezetime:freezetimersetting

(S4 dip switch 9 & 10)

F/S in control

4. Pump-Out Cycle

•Factorysetforevery

10th cycle

(S4 dip switch 5 & 6)

•PMstopsfor2sec.,

then reverses for

10/20 sec.

(S4 dip switch 3 & 4)

DO NOT ADJUST S4

dip switch 3 and 4 to

3 off and 4 on.

WV energized

F/S open

WV continues

Comp energized

FMR energized

HGVs energized

Thermistor temperature

reaches 48°F (9°C)

(3.9 kΩ or less).

Harvest timer starts.

F/S open

Comp continues

FMR continues

PM continues

LLVs energized

HGVs de-energized

F/S closed

Comp continues

FMR continues

PM de-energized for 2 sec., then

energized in reverse

direction for 10/20 sec.

HGVs energized

LLVs de-energized

F/S check

Startup begins

here after 5-sec.

delay

If F/S is open, Comp and FMR de-energize and cycle returns to 1-Minute Fill Cycle

5-min. timer in

control

F/S closed

F/S open or freeze

timer terminates

50 sec.

PM energized

WV de-energized

Harvest Pump

Timer

KMS-830MLH with SRK-8H/3

Legend:

BC–bin control

Comp–compressor

FMR–fan motor-remote

F/S–oat switch

HGVs–hot gas valves (KMS and SRK)

LLVs–liquid line valves (KMS and SRK)

PM–pump motor

WV–inlet water valve

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

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

Ice level lowered. No ice

pressing against BC actuator

paddle. Icemaker starts at

"1.1-MinuteFillCycle."

To 1 above

BC closed

Green"BCCLOSED"LEDon

Yellow"BCOPEN"LEDoff

Components Energized when the Control Switch is in the "WASH" Position

The"WASH"positiononthecontrolswitchisusedwhencleaningandsanitizingtheunit.Wheninthe"WASH"position,

power is supplied to the pump motor. With the cleaning valve closed, the cleaner and sanitizer ow over the outside of

the evaporator plate assembly. With the cleaning valve open, the cleaner and sanitizer ow over both the outside and the

inside of the evaporator plate assembly.

Note: Close the cleaning valve after cleaning and sanitizing are complete, otherwise the unit will not re-start when the

controlswitchisplacedinthe"ICE"position.

16

C. Control Board

•A Hoshizaki exclusive solid-state control board is employed in Hoshizaki Crescent

Cubers.

•All models are pretested and factory set.

•Foracontrolboardcheckprocedure,see"IV.B.ControlBoardCheck."

NOTICE

1. The control board is fragile; handle very carefully.

2. 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 unit before handling or replacing the control board.

3. Do not touch the electronic devices on the control board or the back of the

control board.

4. Do not change wiring and connections. Do not misconnect K3, K4, and K5,

because the same style connector is used for all three.

K3 = Thermistor

K4 = Bin Control

K5 = Float Switch

5. Always replace the whole control board assembly if it goes bad.

6. Do not short out power supply to test for voltage.

17

1. Control Board Layout

"G" Control Board

Part Number 2A3792-01

"G" Control Board

• "ALARM RESET" Button

• "OUTPUT TEST" Button

(used to test relays on control board)

• K3 Connector (white)

Harvest Control

(thermistor)

• K4 Connector (red)

Bin Control

• K5 Connector (black)

Float Switch

• Part Number

• K1 Ten-Pin Connector

Pins #1 through #10

#1, 9-LED 1:

Compressor Relay (1 phase),

Magnetic Contactor (3 phase),

and Remote Fan Motor

#2-LED 2 on: Hot Gas Valves

(KMS and SRK) and X10 Relay in

Fill and Harvest

#3-LED 2 off: Liquid Line Valves

(KMS and SRK)

#4-LED 3 off: Pump Motor in

Freeze

#5-LED 3 on: Pump Motor

in Harvest Pump Timer and

Pump-Out

#6-LED 4: Inlet Water Valve and

X11 Relay

# 7, 1 0 115VAC Power Supply

#8 Open

• Bin Control Switch

Open LED (yellow)

• S4 Dip Switch

• Bin Control Switch

Closed LED (green)

• Alarm Buzzer

• Power LED (red)

(lights when

10.5VAC is supplied

to K2 connector)

• 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

LED 3 off:

K1 Connector Pin #4

• 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

• Relay LEDs (green)

(indicate which relays

and K1 connector pins

are energized)

18

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 X10 Relay, WV 1 minute

Harvest Cycle 1, 4, 2 Comp, FMR, WV,

HGVs

2 minutes 20 minutes 3 to 5 minutes

Harvest Pump Timer 1, 3, 2 Comp, FMR, PM,

HGVs

0 seconds 50 seconds harvest pump timer

setting

Freeze Cycle 1 Comp, FMR, PM,

LLVs

5 minutes freeze timer

setting

30 to 35 minutes

Pump-Out Cycle 1, 3, 2 Comp, FMR, PM,

HGVs

10 seconds 20 seconds

The built-in safeties shut down the unit and have alarms as listed below.

No. of Beeps

(every 3 sec.)

Type of Alarm Notes

1 High Evaporator Temp.

(temperature > 127°F (53°C))

Check for harvest problem (stuck HGVs), hot water

entering unit, stuck HM, or shorted thermistor.

2 Harvest Backup Timer

(harvest > 20 min. for two cycles

in a row)

Check for open thermistor, HGVs not opening, TXV or

LLVs leaking by, low charge, or inefficient Comp.

3 Freeze Timer

(freeze > freeze timer setting for

two cycles in a row)

Timer is factory set using S4 dip

switch 9 & 10

Check for F/S stuck closed (up), WV leaking by, HGVs

leaking by, PM not pumping, TXV not feeding properly,

LLVs not opening, low charge, HM not bypassing, or

inefficient Comp.

Toresettheabovesafeties,pressthe"ALARMRESET"buttonwiththepowersupplyon.

6 Low Voltage

(92Vac±5% or less)

Red LED turns off if voltage protection operates.

The control voltage safeties automatically reset when

voltage is corrected.

7 High Voltage

(147Vac±5% or more)

Legend: Comp–compressor; FMR–fan motor-remote; F/S–oat switch; HGVs–hot gas

valves (KMS and SRK); HM–headmaster (C.P.R.); LLVs–liquid line valves (KMS

and SRK); PM–pump motor; TXV–thermostatic expansion valve; WV–inlet water

valve;

19

1 2 3 4 5 6 7 8 9 10

ON

1 2 3 4 5 6

ON

S4

S5

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 set to the following positions:

S4 Dip Switch

Model

S4 Dip Switch No.

1 2 3 4 5 6 7 8 9 10

KMS-830MLH

OFF OFF OFF OFF ON ON ON OFF OFF OFF

S5 Dip Switch (Do Not Adjust)

Model

S5 Dip Switch No.

1 2 3 4 5

KMS-830MLH OFF OFF OFF OFF OFF

b) Harvest Timer (S4 dip switch 1 & 2)

The harvest timer starts 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 harvest needs to be prolonged for extra cleaning.

Before changing this setting, contact your local Hoshizaki distributor or 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.

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)."

S4 Dip Switch Setting Time

(seconds)

No. 1 No. 2

OFF OFF 60

ON OFF 90

OFF ON 120

ON ON 180

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

1 2 3 4 5 6 7 8 9 10

ON

1 2 3 4 5 6

ON

S4

S5

Do Not Adjust

S5 Dip Switch

Rell Counter

(2 through 6)

Float Switch

Selector (1)

20

c) Pump-Out Timer (S4 dip switch 3 & 4)

NOTICE

Do not adjust S4 dip switch 3& 4 to 3 off and 4 on. Otherwise, pump motor

does not rotate in the pump-out direction.

When a pump-out is called for, the pump motor de-energizes for 2seconds, then

energizes for 10/20 seconds in reverse direction. Water is removed from the bottom of

the water tank and sent down the drain through the check valve. At the same time, water

ows through the small F/S tube to power ush F/S. 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. However, where water quality is bad and the

icemaker needs a longer pump-out, the pump-out timer can be adjusted. The pump-out

timer (S4 dip switch 3 & 4) can be set to have a 10 or 20 second pump-out.

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

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

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Hoshizaki KMS-830MLH User manual

Hoshizaki KMS-830MLH User manual

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