Hoshizaki KMS2000MLH Service Manual

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Page 1

Service Manual

Modular Crescent Cuber Serenity Series

Model KMS-2000MLH

Including Condensing Unit Models SRK-20H/3

hoshizakiamerica.com

Number: 73188 Issued: 8-30-2011 Revised: 9-1-2016

Page 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, 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.

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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.

CONTENTS

Important Safety Information ................................................................................................. 5

I. Specications ...................................................................................................................... 7

A. Icemaker ....................................................................................................................... 7

1. KMS-2000MLH with SRK-20H ................................................................................. 7

2. KMS-2000MLH with SRK-20H3 ............................................................................. 8

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

1. SRK-20H .................................................................................................................. 9

2. SRK-20H3 ............................................................................................................. 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 ......................................................................................................... 15

2. Sequence Flow Chart ............................................................................................ 16

C. Control Board .............................................................................................................. 17

1. Control Board Layout ............................................................................................. 18

2. LED Lights and Audible Alarm Safeties ................................................................. 19

3. Controls and Adjustments ...................................................................................... 20

a) Default Dip Switch Settings .............................................................................. 20

b) Harvest Timer (S1 dip switch 1 & 2) ................................................................. 20

c) Pump-Out Timer (S1 dip switch 3 & 4) ............................................................. 21

d) Pump-Out Frequency Control (S1 dip switch 5 & 6)......................................... 21

e) Harvest Pump Timer (S1 dip switch 7 & 8) ...................................................... 22

f) Freeze Timer (S1 dip switch 9 & 10) ................................................................. 22

g) Pump-Out/Drain Selector (S2 dip switch 1) ..................................................... 23

h) Float Switch Selector (S2 dip switch 2) ............................................................ 23

i) Rell Counter (S2 dip switch 3 & 4) ................................................................... 23

j) Anti-Slush Program Selector (S2 dip switch 5) .................................................. 24

k) Anti-Slush Control (S2 dip switch 6) ................................................................. 24

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D. Control and Service Switches ..................................................................................... 25

1. Control Switch ........................................................................................................ 25

2. Service Switch ....................................................................................................... 25

a) DRAIN .............................................................................................................. 25

b) CIRC. ............................................................................................................... 25

c) WASH ............................................................................................................... 25

III. Technical Information ...................................................................................................... 26

A. Water Circuit and Refrigeration Circuit ........................................................................ 26

B. Wiring Diagrams .......................................................................................................... 27

1. KMS-2000MLH with SRK-20H ............................................................................... 27

2. KMS-2000MLH with SRK-20H3 ............................................................................ 28

3. Wire Harness Connections .................................................................................... 29

C. Performance Data ....................................................................................................... 30

1. KMS-2000MLH with SRK-20H ............................................................................... 30

2. KMS-2000MLH with SRK-20H3 ............................................................................ 31

IV. Service Diagnosis ........................................................................................................... 32

A. Diagnostic Procedure .................................................................................................. 32

B. Control Board Check ................................................................................................... 36

C. Bin Control Check and Cleaning ................................................................................. 37

1. Bin Control Check .................................................................................................. 37

2. Bin Control Cleaning .............................................................................................. 38

D. Float Switch Check and Cleaning ............................................................................... 39

1. Float Switch Check ................................................................................................ 39

2. Float Switch Cleaning ............................................................................................ 40

E. Thermistor Check ........................................................................................................ 41

F. Diagnostic Charts ........................................................................................................ 42

1. No Ice Production ................................................................................................... 42

2. Freeze-Up .............................................................................................................. 43

3. Low Ice Production ................................................................................................ 45

V. Replacement of Components .......................................................................................... 47

A. Service for Refrigerant Lines ....................................................................................... 47

1. Refrigerant Recovery ............................................................................................. 47

2. Brazing .................................................................................................................. 48

3. Evacuation and Recharge (R-404A) ...................................................................... 48

B. Important Notes for Component Replacement ............................................................ 50

VI. Cleaning and Maintenance ............................................................................................ 51

A. Cleaning and Sanitizing Instructions ........................................................................... 51

1. Cleaning Procedure ................................................................................................ 51

2. Sanitizing Procedure - Following Cleaning Procedure ........................................... 53

B. Maintenance ................................................................................................................ 54

C. Preparing the Icemaker for Long Storage ................................................................... 55

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Important Safety Information

Throughout this manual, notices appear to bring your attention to situations which could result in death, serious injury, damage to the unit, 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 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:

• Only qualied service tecnicians should install, service, and maintain the icemaker.

• 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 damage to equipment.

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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 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.

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I. Specications

A. Icemaker

1. KMS-2000MLH with SRK-20H

AC SUPPLY VOLTAGE 115VAC Supplied by SRK-20H via Factory Supplied

AMPERAGE 21.3 A (5 Min. Freeze AT 104°F/WT 80°F) MINIMUM CIRCUIT AMPACITY 30 A MAXIMUM FUSE SIZE 30 A APPROXIMATE ICE PRODUCTION Ambient WATER TEMP. (°F) PER 24 HR. Temp.(°F) 50 70 90 lb/day ( kg/day ) 70 *1861 (844) 1842 (835) 1722 (781) Reference without *marks 80 1846 (837) 1816 (824) 1645 (746)

SHAPE OF ICE Crescent Cube ICE PRODUCTION PER CYCLE 27.9 lb (12.6 kg) 1560 pcs. APPROXIMATE STORAGE CAPACITY N/A ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F ELECTRIC W (kWH/100 lb) 3520(4.70) 3330(4.30) WATER gal/24HR (gal/100 lb) 395(22.0) 864(46.4) CEE TIER LEVEL 1 ENERGY STAR YES EXTERIOR DIMENSIONS (WxDxH) 30"x24"x32.9" (762x610x836 mm) EXTERIOR FINISH Stainless Steel, Galvanized Steel (Rear) WEIGHT Net 171 lb (78 kg), Shipping 206 lb (93 kg) CONNECTIONS - ELECTRIC Wire Harness Connection from SRK to KMS

- WATER SUPPLY Inlet 1/2" FPT

- DRAIN Outlet 3/4" FPT

-CONDENSATION 5/8" O.D. Hard Tube

-REFRIGERATION Liquid Line 1/2" 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 COOLING WATER CONTROL N/A BIN CONTROL SYSTEM Mechanical Level Switch and Timer COMPRESSOR Hermetic, Model CS24K6E-PFV-275 CONDENSER Air-Cooled Remote, Condensing Unit SRK-20H EVAPORATOR Vertical Type, Stainless Steel and Copper REFRIGERANT CONTROL Thermostatic Expansion Valve

REFRIGERANT CHARGE R404A, 27 lb 5.4 oz (12400 g)

DESIGN PRESSURE High 467PSIG, Low 230PSIG P.C. BOARD CIRCUIT PROTECTION High Voltage Cut-Out (Internal) LOW W ATER PROTECTION Float Switch ACCESSORIES -SUPPLIED N/A

-REQUIRED Dispenser Unit or Ice Storage Bin

OPERATING CONDITIONS VOLTAGE RANGE 187-253VAC

Wire Harness

90 1842 (835) *1795 (814) 1643 (745)

100 1786 (810) 1759 (798) 1504 (682)

Suction Line 3/4" Copper Tube Field Connection

Headmaster (C.P.R.) in SRK-20H (190 PSIG)

(Icemaker 0 lb 7 oz (200 g)) (Condensing Unit 26 lb 14.3 oz (12600 g))

Condensing Unit: SRK-20H

AMBIENT TEMP.

KMS-2000MLH 45-100°F

SRK-20H (Outdoor Use) -20-122°F WATER SUPPLY TEMP. 45-90°F WATER SUPPLY PRESSURE 10-113 PSIG

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

notice.

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2. KMS-2000MLH with SRK-20H3

AC SUPPLY VOLTAGE 115VAC Supplied by SRK-20H3 via Factory Supplied

Wire Harness AMPERAGE 11.0 A (5 Min. Freeze AT 104°F/WT 80°F) MINIMUM CIRCUIT AMPACITY 20 A MAXIMUM FUSE SIZE 20 A APPROXIMATE ICE PRODUCTION Ambient WATER TEMP. (°F) PER 24 HR. Temp.(°F) 50 70 90 lb/day ( kg/day ) 70 *1910 (866) 1850 (839) 1767 (801) Reference without *marks 80 1864 (846) 1772 (804) 1687 (765)

90 1850 (839) *1706 (774) 1620 (735)

100 1833 (831) 1686 (765) 1541 (699)

SHAPE OF ICE Crescent Cube ICE PRODUCTION PER CYCLE 27.4 lb (12.4 kg) 1560 pcs. APPROXIMATE STORAGE CAPACITY N/A ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F ELECTRIC W (kWH/100 lb.) 3310(4.65) 3290(4.14) WATER gal/24HR (gal/100 lb) 397(23.3) 917(48.0) CEE TIER LEVEL 1 ENERGY STAR YES EXTERIOR DIMENSIONS (WxDxH) 30"x24"x32.9" (762x610x836 mm) EXTERIOR FINISH Stainless Steel, Galvanized Steel (Rear) WEIGHT Net 171 lb (78 kg), Shipping 206 lb (93 kg) CONNECTIONS - ELECTRIC Wire Harness Connection from SRK to KMS

- WATER SUPPLY Inlet 1/2" FPT

- DRAIN Outlet 3/4" FPT

-CONDENSATION 5/8" O.D. Hard Tube

-REFRIGERATION Liquid Line 1/2" Copper Tube Field Connection Suction Line 3/4" 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 COOLING WATER CONTROL N/A BIN CONTROL SYSTEM Mechanical Level Switch and Timer COMPRESSOR Hermetic, Model CS24K6E-TF5-275 CONDENSER Air-Cooled Remote, Condenser Unit SRK-20H3 EVAPORATOR Vertical Type, Stainless Steel and Copper REFRIGERANT CONTROL Thermostatic Expansion Valve

Headmaster (C.P.R.) in SRK-20H3 (190 PSIG)

REFRIGERANT CHARGE R404A, 27 lb 5.4 oz (12400 g)

(Icemaker 0 lb 7 oz (200 g)) (Condensing Unit 26 lb 14.3 oz (12600 g))

DESIGN PRESSURE High 467PSIG, Low 230PSIG P.C. BOARD CIRCUIT PROTECTION High Voltage Cut-Out (Internal) LOW W ATER PROTECTION Float Switch ACCESSORIES -SUPPLIED N/A

-REQUIRED Dispenser Unit or Ice Storage Bin Condensing Unit: SRK-20H3

OPERATING CONDITIONS VOLTAGE RANGE 187-253VAC

AMBIENT TEMP.

KMS-2000MLH 45-100°F

SRK-20H3 (Outdoor Use) -20-122°F WATER SUPPLY TEMP. 45-90°F WATER SUPPLY PRESSURE 10-113 PSIG

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

notice.

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B. Condensing Unit

1. SRK-20H

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

(115VAC Supplied to KMS via Factory Wire Harness)

AMPERAGE 21.3 A (5 Min. Freeze AT 104°F/WT 80°F)

MINIMUM CIRCUIT AMPACITY 30 A

MAXIMUM FUSE SIZE 30 A

EXTERIOR DIMENSIONS (WxDxH) 59.7"x17"x30" (1517x431x762 mm)

DIMENSIONS INCLUDING LEGS (WxDxH) 62"x21"x45" (1575x533x1142 mm)

EXTERIOR FINISH Galvanized Steel

WEIGHT Net 280 lb (127 kg) Shipping 325 lb (147 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 3/4" Copper Tube Field Connection

COMPRESSOR Hermetic, Model CS24K6E-PFV-275

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.) (190 PSIG)

REFRIGERANT CHARGE R404A, 27 lb 5.4 oz (12400 g)

(Condensing Unit 26 lb 14.3 oz (12600 g))

(Icemaker 0 lb 7.0 oz) (200 g))

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 16 pcs

Hex Nut M8 16 pcs

-REQUIRED Compatible KMS Icemaker

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

notice.

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2. SRK-20H3

AC SUPPLY VOLTAGE 208-230/60/3

(115VAC Supplied to KMS via Factory Wire Harness)

AMPERAGE 11.0 A (5 Min. Freeze AT 104°F/WT 80°F)

MINIMUM CIRCUIT AMPACITY 20 A

MAXIMUM FUSE SIZE 20 A

EXTERIOR DIMENSIONS (WxDxH) 59.7"x17"x30" (1517x431x762 mm)

DIMENSIONS INCLUDING LEGS (WxDxH) 62"x21"x45" (1575x533x1142 mm)

EXTERIOR FINISH Galvanized Steel

WEIGHT Net 280 lb ( 127 kg ) Shipping 325 lb ( 147 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 3/4" Copper Tube Field Connection

COMPRESSOR Hermetic, Model CS24K6E-TF5-275

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.) (190 PSIG)

REFRIGERANT CHARGE R404A, 27 lb 5.4 oz (12400 g)

(Condensing Unit 26 lb 14.3 oz (12600 g))

(Icemaker 0 lb 7.0 oz) (200 g))

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 M8 x 16 16 pcs

Hex. Nut M8 16 pcs

- REQUIRED Compatible KMS Icemaker

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

notice.

Page 11

II. General Information

A. Construction

1. Icemaker

Top Panel

Top Insulation

Spray Guides

Spray Tubes

Insulation Panel

Evaporator

Inlet Water Valve

Wash Valve

Hot Gas Valve

Strainer

Low Side Service Valve

Thermostatic Expansion Valves

Front Panel

Control Switch

Service Switch

Fuse (KMS)

Control Box

Drain Valve

Switch Cover

Switch Mount

Extension Bracket

Bin Control

Control Box

Drier

Float Switch

Bin Control

Liquid Line Valve

Pump Motor

High Side Service Valve

Thermistor

Left Side Panel

Switch Bracket

Page 12

2. Condensing Unit

Main Transformer (Three Phase Only)

Low Side Service Valve

Condenser

Control Box

High Side Service Valve

Top Panel

Right Side Panel

Fan Motors

Compressor

Junction Box

Louver Panel

Hot Gas Valves

Headmaster (C.P. R.)

Accumulator

Front Panel

Discharge Line Thermostat

Liquid Line Valve

Left Side/Upper Panel Right (L3)

Strainers

High-Pressure Switch

Receiver

Left Side/Upper Panel Left (L2)

Left Side/Lower Panel (L1)

Page 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 turns on. If CB red "POWER OK" LED is ashing, 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 component LEDs from the outer edge of CB is 5, 6, 8, 9, 4, 7.

a) 1-Minute Fill Cycle

LED 8 is on. WV energizes. After 1 minute, CB checks for a closed F/S. If F/S is closed, the harvest cycle begins. If not, 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 5, 6, and 8 are on. WV remains energized. Comp, FMRs, HGVs 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 3.9 kΩ from the thermistor and turns harvest termination over to the harvest timer. For details, see "II.C.3.b) Harvest Timer (S1dip switch 1 & 2)." The pump-out timer acts in place of the harvest timer during cycles with a pump-out. For details, see"II.C.3.c) Pump-Out Timer (S1 dip switch 3 &4)." WV is energized during harvest for a maximum of 6 minutes or the length of harvest minus 50 seconds, whichever is shorter. For details, see "II.C.3.e) Harvest Pump Timer (S1 dip switch 7 & 8)." 50 seconds before the harvest timer terminates, LED 8 turns off and WV de-energizes. Harvest Pump Timer: LEDs 5, 6, and 7 are on. LED 7 turns on and PM energizes. Comp, FMRs, and HGVs remain energized. When the harvest timer terminates, the harvest cycle is complete. CB checks the position of F/S and proceeds to the freeze 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

LEDs 5 & 7 are on. Comp, FMRs, and PM remain energized. LLVs energize, HGVs de-energize. CB monitors the cooling of the evaporator via the thermistor located on the suction line. When the temperature drops to 36°F (2°C), CB reads 5.5 kΩ from the thermistor and starts the 5-minute short cycle protection timer. CBdoes not monitor F/Suntil the 5-minute short cycle protection timer terminates. After the 5-minute short cycle protection timer terminates, CB 1-minute default rell timer starts (LED 9 is on during CB1-minute default rell). The KMS-2000MLH is not wired for the 1-minute default rell. When CB 1-minute default rell 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 is open for 15 continuous seconds.

Page 14

Anti-Slush Control: LED 5 is on. Comp, FMRs, and LLVs remain energized. PM de-energizes for 10 seconds. CB monitors the cooling of the evaporator via the thermistor located on the suction line. When the temperature drops to 34°F (1°C), CB reads

5.8kΩ from the thermistor, then LED 7 turns off and PM de-energizes for 10 seconds.

NOTICE! Do not adjust S2 dip switch 5 and 6 out of the factory default position on this model. This setting helps prevent slushing during the freeze cycle.

d) Pump-Out Cycle

LEDs 5, 6, 4, and 7 are on. Comp and FMRs remain energized, HGVs energize. LLVsde-energize. PM de-energizes for 2 seconds. When S2 dip switch 1 is in the on position, PM and DV energize. NOTICE! Do not adjust S2 dip switch 1 out of the

factory default position on this model. This dip switch must be left in the factory default position or this unit will not operate correctly. For details, see "II.C.3.g)

Pump-Out/Drain Selector (S2 dipswitch1)." PM takes water from the water tank and pumps it through DV and down the drain. At the same time, water ows through the small F/S tube to power ush F/S. Pump-out lasts for 10seconds. When the pump-out timer terminates, pump-out is complete.

The rst pump-out occurs after the 1st freeze cycle, then every 10th cycle thereafter. 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 can be set to have a 10or 20second pump-out. For details, see "II.C.3.c) Pump-Out Timer (S1 dip switch 3 & 4)." The pump-out frequency control can be set to have a pump-out occur every cycle, or every 2,5, or 10 cycles. For details, see "II.C.3.d) Pump-Out Frequency Control (S1 dip switch 5 & 6)."

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.

Page 15

f) Shutdown

LEDs 4 and 7 are on: When BC is activated (BC open), CB red "POWER OK" LED ashes. There is a delay before the shutdown sequence begins. The delay varies depending on the cycle the icemaker is in at the time of activation. For details, see the table below.

Cycle at Bin Control Activation Delay Before Shutdown Sequence Begins

Fill Cycle 15 seconds

Harvest Cycle 15 seconds after the next freeze cycle starts

Freeze Cycle 15 seconds if BC is activated between the beginning of freeze and

termination of the 5-minute short cycle protection timer (timer starts when the thermistor temperature drops to 36°F (2°C) (5.5 kΩ or more)). After this time, the unit will not shut down until the next harvest cycle is complete.

After the shutdown delay, all components de-energize. 2 seconds later, DV and PM energize. PM takes water from the water tank and pumps it through DV and down the drain. NOTICE! Do not adjust S2 dip switch 1 out of the factory default position

on this model. This dip switch must be left in the factory default position or this unit will not operate correctly. For details, see "II.C.3.g) Pump-Out/Drain Selector (S2

dipswitch1)." The water tank drains for a maximum of 5 minutes or until F/S opens. DVand PM then de-energize. When BC closes again calling for ice, the unit starts at the 1-minute ll cycle. There is a 90-second minimum off time before the icemaker can restart.

Legend: BC–bin control; 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; WV–inlet water valve

Page 16

2. Sequence Flow Chart

10th cycle.

(S2 dip switch 1),

energize for 10sec.

4. Pump-Out Cycle

• Factory set forevery

(S1 dip switch 5 & 6)

• PM stops for 2 sec.

then PM and DV

(S1 dip switch 3 & 4)

F/S in

control

Comp continues

F/S opens

or freeze

FMRs continue

timer

terminates

Thermistor

temperature

HGVs energized

DV and PM de-energized 2sec.,

drops to 34°F

(1°C) (5.8 kΩ or

then energized for 10sec.

LLVs de-energized

more).

PM de-energizes

To 1 above

No ice pressing against

BC actuator.

4. Ice Level Lowered

BC closed

"POWER OK" LED on (not ashing)

Min. off time: 90 sec.

3. Icemaker Off

for 10 seconds.

• Minimum freeze time: 5 min.

• Maximum freeze time: freeze timer setting

(S1 dip switch 9 & 10)

3. Freeze Cycle

KMS-2000MLH with SRK-20H/3

1 to 3-min. timer in control

"H" Control Board Sequence Flow Chart

(S1 dip switch 1 & 2)

5-min. timer

in control

Thermistor

in control

Anti-Slush

F/S check

50 sec.

HarvestPump Timer

Thermistor

PM energized

Comp continues

temperature

FMRs continue

WV de-energized

drops to 36°F

(2°C) (5.5 kΩ

PM continues

Thermistor temperature

or more).

5-minute

LLVs energized

HGVs de-energized

reaches 48°F (9°C)

(3.9 kΩ or less)

Harvest timer starts.

short cycle

protection

F/S open

DV and PM de-energized

timer starts.

until F/S opens.

2. Water Tank Drains

Max. drain time: 5 min.

Water tank drains

All components de-energized

DV and PM energized after 2 sec.

Power is supplied to the pump motor and drain valve. This drains the water tank.

Power is supplied to the pump motor 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 motor 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

2. Harvest Cycle

1. 1-Minute

Cycle

• WV time: 6 min. or the length of harvest minus

Fill Cycle

Steps

50 sec. (S1 dip switch 7 & 8), whichever is

shorter. DO NOT ADJUST S1 dip switch 7 & 8

• Maximum harvest time: 20 min.

Thermistor

in control

F/S closed

Startup

begins

WV continues

Comp energized

FMRs energized

HGVs energized

and termination of the 5-min. short cycle protection timer (timer starts when

thermistor temperature drops to 36°F (2°C) (5.5 KΩ or more)). After this time,

• Fill Cycle – 15 sec.

• Harvest Cycle – 15 sec. after freeze cycle starts.

Shutdown Delay After Bin Control is Activated:

1. Bin Full

WV energized

5-sec. delay

F/S open

If F/S is open, Comp and FMRs de-energize and cycle returns to 1-minute ll cycle

Shutdown

andRestart

F/S check

here after

unit will not shut down until next harvest cycle is complete.

• Freeze Cycle – 15 sec. if BC is activated between beginning of freeze

BC open

"POWER OK" LED ashing

Legend:

BC-bin control

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

BC Operation

WV-inlet water valve

Page 17

C. Control Board

• A Hoshizaki exclusive control board is employed in Hoshizaki Crescent Cubers.

• All models are pretested and factory-adjusted.

• 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.

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

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

Page 18

1. Control Board Layout

• "POWER OK" LED (red)

(Lights when 10.5VAC is supplied to K7 connector. Flashes when bin control is activated (bin full))

• Relay LEDs (red)

(indicate which relays and connector pins are energized)

• LED 5 (X1 Relay)

K3 Connector Pin #1, #2

• LED 6 (X2 Relay)

LED 6 off: K5 Connector Pin #1 LED 6 on: K5 connector Pin #2

• LED 8 (X4 Relay)

K5 Connector Pin #4

• LED 9 (X5 Relay)

K5 Connector Pin #5

• LED 4 (X6 Relay)

K5 Connector Pin #6

• LED 7 (X3 Relay)

K5 Connector Pin #3

"H" Control Board

• K7 Connector

Control Transformer (10.5VAC)

POWER OK

101

HKM2006V003

2 1

P00013-02 Ver. 2.5

• Label (Control board part number and program version indicated on label.)

• K3 Connector

#2-LED 5: Magnetic Contactor (compressor and remote fan motors)

• K5 Connector

Pins #1 through #6 #1-LED 6 off: Liquid Line Valves

#2-LED 6 on: Hot Gas Valves #3-LED 7: Pump Motor

#4-LED 8: Inlet Water Valve #5 LED 9: Open #6-LED 4: Drain Valve

• K6 Connector Open

• K1 Connector

Pins #1 through #9 #1, 3 Float Switch #2 Open #4, 5 Bin Control #6, 7 Thermistor (Harvest Timer, 5-minute Freeze Protection Timer Control, Anti-Slush Control) #8, 9 Open

1 10 11 16

• S1 Dip Switch

1 2 3 4 5 6 7 8 9 10

• S2 Dip Switch

"H" Control Board

Part Number P00013-02 Version 2.5

1 2 3 4 5 6

OUTPUT

ALARM

TEST

RESET

• Alarm Buzzer

• "OUTPUT TEST" Button

(used to test relays on control board)

• "ALARM RESET" Button

Page 19

2. LED Lights and Audible Alarm Safeties

At startup, a 5-second delay occurs. The red "POWER OK" LED indicates proper control voltage and remains on unless a control voltage problem occurs. The red "POWER OK" LED ashes continuously when the bin is full. LEDs 4 through 9 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 5, 6, 8, 9, 4, 7. For details, see "II.B. Sequence of Operation."

Sequence Step LED

1-Minute Fill Cycle 8 WV 1 minute

Harvest Cycle 5, 6, 8 Comp, FMRs,

Harvest Pump Timer

Freeze Cycle

Pump-Out Cycle 5, 6, 4, 7* Comp, FMRs,

Freeze 5, 7, 9

Anti-Slush 5 Comp, FMRs,

5, 6, 7 Comp, FMRs,

(9 for 1-minute only)

Energized

Components

HGVs, WV

HGVs, PM Comp, FMRs,

PM, LLVs

LLVs

HGVs, DV, PM*

Min. Max. Avg.

2 minutes 20 minutes 3 to 5 minutes

0 seconds 50 seconds harvest pump

5 minutes freeze timer

10 seconds 20 seconds *pump-out/drain

Time LEDs are On

timer setting 30 to 35 minutes

setting

10 seconds

selector setting

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

No. of Beeps

(every 3 sec.)

1 High Evaporator Temp.

(temperature > 127°F) (53°C))

2 Harvest Backup Timer

(harvest > 20 min. for two cycles in a row)

3 Freeze Timer

(freeze > specied setting for two cycles in a row) Freeze Timer is factory set using S1 dip switch 9 & 10

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

6 Low Voltage

(92VAC±5% or less)

7 High Voltage

(147VAC±5% or more)

Type of Alarm Notes

Check for harvest problem (stuck HGVs), hot water entering unit, stuck HM, or shorted thermistor.

Check for open thermistor, HGVs not opening, TXVs or LLVs leaking by, low charge, or inefficient Comp.

Check for a F/S stuck closed (up), WV leaking by, HGVs leaking by, PM not pumping, TXVs not feeding properly, LLVs not opening, low charge, HM not bypassing, or inefficient Comp.

Red "POWER OK" LED turns off if voltage protection operates. The control voltage safeties automatically reset when voltage is corrected.

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; WV–inlet water valve

Page 20

3. Controls and Adjustments

1 2 3 4 5 6

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:

S1 Dip Switch

S1 Dip Switch No.

Model

KMS-2000MLH OFF OFF OFF OFF ON ON ON ON OFF OFF

Model

KMS-2000MLH ON ON OFF OFF OFF OFF

1 2 3 4 5 6 7 8 9 10

S2 Dip Switch

S2 Dip Switch No. (Do Not Adjust)

1 2 3 4 5 6

S1 Dip Switch

S2 Dip Switch

Freeze Timer (9 & 10)

Do Not Adjust

Anti-Slush Control (6)

Anti-Slush Program

Harvest Pump Timer (7& 8)

Pump-Out Frequency

Selector (5)

Rell Counter (3 & 4)

Control (5 & 6)

Float Switch

1 2 3 4 5 6 7 8 9 10

Pump-Out Timer (3 & 4)

Harvest Timer (1 & 2)

1 2 3 4 5 6

Selector (2)

Pump-Out/Drain Selector (1)

b) Harvest Timer (S1 dip switch 1 & 2)

The harvest timer starts when the thermistor reaches 48°F (9°C) at the evaporator outlet and the control board reads 3.9 kΩ from the thermistor. 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 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 (S1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 (S1 dip switch 3 & 4)."

S1 Dip Switch Setting

No. 1

OFF

No. 2

OFF 60

OFF 90

ON 120

ON 180

Time (seconds)

Page 21

c) Pump-Out Timer (S1 dip switch 3 & 4)

When a pump-out is called for, the pump motor de-energizes for 2 seconds, then the pump motor and drain valve energize for 10/20 seconds. Water is removed from the bottom of the water tank and pumped down the drain through the drain valve. 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. 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 can be set to have a 10 or 20 second pump-out.

S1 Dip Switch Setting Time (seconds)

No. 3 No. 4

OFF OFF 10 120

ON OFF 10 180

OFF ON 20 120

ON ON 20 180

T1: Time to drain the water tank T2: Harvest timer at pump-out

d) Pump-Out Frequency Control (S1 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.

S1 Dip Switch Setting

No. 5 No. 6

OFF OFF Every cycle

ON OFF Every 2 cycles

OFF ON Every 5 cycles

ON ON Every 10 cycles

Pump-Out Frequency

Page 22

e) Harvest Pump Timer (S1 dip switch 7 & 8)

NOTICE

Factory set. Do not adjust. Adjustment outside of the factory default setting may result in damage to the icemaker.

Depending on the harvest pump timer setting, the pump motor stays off or energizes and runs for the last 10, 30, or 50 seconds of the harvest cycle. The water valve is energized during harvest for a maximum of 6 minutes or the length of harvest minus 0, 10, 30, or 50 seconds (determined by the harvest pump timer setting), whichever is shorter.

S1 Dip Switch Setting

No. 7 No. 8

OFF OFF 0

ON OFF 10

OFF ON 30

ON ON 50

Pump Motor

Time (seconds)

f) Freeze Timer (S1 dip switch 9 & 10)

NOTICE

Adjust to proper specication, or the unit may not operate correctly.

The freeze timer setting determines the maximum allowed freeze time to prevent possible freeze-up issues. Upon termination of freeze timer, the control board initiates the harvest cycle. After 2 consecutive freeze timer terminations, the control board shuts down the icemaker. In this case, see "IV.F.3. Low Ice Production" for possible solutions. The freeze timer is factory set, and generally no adjustment is required. Before changing this setting, contact your local Hoshizaki distributor or Hoshizaki Technical Support at 1-800-233-1940 for recommendations.

Dip Switch Setting

No. 9 No. 10

OFF OFF 60

OFF ON 70

ON OFF 50

ON ON 100

Time

(minutes)

Page 23

g) Pump-Out/Drain Selector (S2 dip switch 1)

NOTICE

Do not adjust. Factory set for proper operation. Adjustment outside of the factory default setting may result in damage to the icemaker.

The pump-out/drain selector setting determines whether the pump motor energizes (pump-out) or stays off (drain) after a 2-second delay at the beginning of the pump-out cycle or at shutdown. Regardless of the pump-out/drain selector setting, the drain valve energizes after a 2-second delay at the beginning of the pump-out cycle or at shutdown. When the pump-out/drain selector is set to pump-out, the pump motor energizes and takes water from the water tank and pumps it through the drain valve and down the drain. When the pump-out/ drain selector is set to drain, water drains by gravity through the drain valve.

S2 Dip Switch Setting

No. 1

OFF Drain

ON Pump-Out

Pump-Out/

Drain

h) Float Switch Selector (S2 dip switch 2)

NOTICE

Do not adjust. This must be left in the factory default position.

On units with a double oat switch, the oat switch selector determines which oat switch (upper or lower) the control board monitors for rell initiation during the freeze cycle, and the rell counter (S2 dip switch 3 & 4) determines the number of rells. The KMS-2000MLH uses a single oat switch with a double oat switch/upper oat switch rell setting. The KMS-2000MLH does not rell. When the 5-minute short cycle protection timer terminates, the control board checks the upper oat switch. If an upper oat switch exists, rell is initiated by an open upper oat switch and is terminated by a closed upper oat switch. In a single oat switch application with a double oat switch/upper oat switch rell setting, no upper oat switch exists, therefore the control board reads an open upper oat switch and initiates a 1-minute default rell. The KMS-2000MLH is not wired for the 1-minute default rell. During the 1-minute default rell time, LED 9 is on. After the 1-minute default rell timer terminates, the rell counter setting is ignored for the rest of the freeze cycle.

S2 Dip Switch Setting

OFF Single or Double Lower Switch

ON Double Upper Switch

Float Switch

Type

Rell Initiation

with Double Float

SwitchNo. 2

i) Rell Counter (S2 dip switch 3 & 4)

NOTICE

Do not adjust. These must be left in the factory default position.

The rell counter determines the number of rells during the freeze cycle. The KMS-2000MLH does not rell.

Page 24

j) Anti-Slush Program Selector (S2 dip switch 5)

The anti-slush program selector determines which anti-slush program is used during the freeze cycle when the anti-slush control (S2 dip switch 6) is activated. The anti-slush control helps prevent slushing in the water tank during the freeze cycle.

S2 Dip Switch Settings

No. 5

OFF 10 Seconds Off 1 34°F (1°C)

Pump Motor

Operation

10 Sec. Off

50 Sec. On Multiple 50°F (10°C)

10 Sec. Off 2

50 Sec. On 1

# of Times Pump

Motor De-Energized

Temperature

Anti-Slush Begins

34°F (1°C)

S2 Dip Switch 5 "OFF" Program: The control board monitors the cooling of the evaporator via the thermistor located on the suction line. When the temperature drops to 34°F (1°C), the control board reads 5.8 kΩ from the thermistor and de-energizes the pump motor for 10 seconds. This is the only time in the freeze cycle that the pump motor de-energizes. S2 Dip Switch 5 "ON" Program: The control board monitors the cooling of the evaporator via the thermistor located on the suction line. When the temperature drops to 50°F (10°C), the control board reads 3.8kΩ from the thermistor. The pump motor de-energizes for 10 seconds, then energizes for 50seconds. This continues (10sec.off/50 sec. on) until the temperature drops to 34°F(1°C). At 34°F (1°C), the control board reads 5.8kΩ from the thermistor and performs the nal off/on/off cycle. The pump motor then energizes for the remainder of the freeze cycle.

k) Anti-Slush Control (S2 dip switch 6)

NOTICE

Do not adjust. S2 dip switch 6 must be left in the factory default position. Otherwise, damage to the icemaker may occur.

When the anti-slush control is activated (S2 dip switch 6 "OFF"), the pump motor de-energizes during the freeze cycle according to the anti-slush program selector (S2dip switch 5). The anti-slush control helps prevent slushing in the water tank during the freeze cycle. See "II.C.3.j) Anti-Slush Program Selector (S2 dip switch 5)."

S2 Dip Switch Settings

No. 6

OFF Activated

ON Deactivated

Anti-Slush

Page 25

D. Control and Service Switches

The control switch and service switch are used to control the operation of this unit. They are located on the control box.

1. Control Switch

The control switch has three positions: "OFF" for power off, "ICE" for icemaking, and "SERVICE" to activate the service switch.

2. Service Switch

When the control switch is in the "SERVICE" position, the control switch supplies power to the service switch. The service switch has three positions: "DRAIN," "CIRC." and "WASH."

Note:

1. When the service switch is active (control switch in the "SERVICE" position), power is supplied to the pump motor in all three positions.

2. When the control switch is in the "OFF" or "ICE" position, the service switch is de-activated. In this state, the service switch can be left in any position.

a) DRAIN

When the service switch is active and in the "DRAIN" position, power is supplied to the pump motor and drain valve.

b) CIRC.

When the service switch is active and in the "CIRC." position, power is supplied to the pump motor only. This operation can be used to circulate cleaner for extended periods of time over the outside surface of the evaporator.

c) WASH

When the service switch is active and in the "WASH" position, power is supplied to the pump motor and wash valve. This operation is used to circulate cleaner and sanitizer over both the inside and outside of the evaporator.

Page 26

III. Technical Information

A. Water Circuit and Refrigeration Circuit

Hot Gas

Headmaster

(C.P. R.)

Check Valve

Valves

Access Valve

Strainers

High-Pressure

Switch

Discharge

Line

Discharge Line Thermostat

Condenser

SRK-20H/3

Strainer

Fans

Service

Liquid Line

Val ve

Wash Valve

Inlet Water Valve

Valves

Heat Exchanger

Thermistor

Suction Line

Liquid Line

Val ve

Drier

Strainer

Hot Gas

Val ve

Compressor

Accumulator

Check Valves

Float Switch

Receiver

Thermostatic

Drain Valve

Expansion Valves

KMS-2000MLH

Water Supply

Spray Tube

Evaporator

Drain

Pump Motor

Water Tank

Page 27

B. Wiring Diagrams

1. KMS-2000MLH with SRK-20H

Control Transformer

Output 10.5V at 115V

Discharge Line Thermostat Switch

Cut-out 266°F±9°F (130°C± 5°C)

PSIG

Cut-in 239°F±9°F (115°C±5°C)

* High-Pressure Switch

Cut-in 341±22 PSIG

Cut-out 426±

Page 28

2. KMS-2000MLH with SRK-20H3

Control Transformer

Output 10.5V at 115V

Discharge Line Thermostat Switch

Cut-out 266°F±9°F (130°C± 5°C)

Cut-in 239°F±9°F (115°C±5°C)

PSIG

* High-Pressure Switch

Cut-out 426±

Cut-in 341±22 PSIG

Page 29

3. Wire Harness Connections

P BK

Neutral

LLV

HGV

V P

KMS Icemaker Unit

(factory connected)

KMS-SRK Wire Harness Connections

Fuse 10A

GND

SRK Remote Condensing Unit

Neutral

Legend:

GND-ground

HGV-hot gas valve

CB-control board

BK W

LLV

LLV-liquid line valve

HGV

Contactor

BR V

Wire Color Code:

BK-black

BR-brown

GR-green

P-pink

V-violet

Fuse 10A

W-white

Page 30

C. Performance Data

1. KMS-2000MLH with SRK-20H

APPROXIMATE ICE PRODUCTION PER 24 HR.

lbs./day kg./day APPROXIMATE ELECTRIC

CONSUMPTION

watts 100/38 APPROXIMATE WATER CONSUMPTION PER 24 HR.

gal./day m3/day FREEZING CYCLE TIME

min. 100/38 HARVEST CYCLE TIME

min. 100/38 HEAD PRESSURE

PSIG kg/cm2G

SUCTION PRESSURE

PSIG kg/cm2G

AMBIENT TEMP.

(ºF/ºC) 50/10 70/21 90/32

70/21 1861 844 1842 835 1722 781

80/27 1846 837 1816 824 1645 746

90/32 1842 835 1795 814 1643 745

100/38 1786 810 1759 798 1504 682

70/21

80/27

90/32

70/21 864 3.27

80/27 0.00 546 2.06 507 1.92

90/32 726 2.75 395 1.49 332 1.26

100/38 560 2.12 380 1.44 274 1.04

70/21

80/27

90/32

70/21

80/27 90/32

70/21 200 14.1

80/27 209 14.7 229 16.1 238 16.7 90/32 212 14.9 242 17.0 253 17.8

100/38 213 15.0 245 17.2 263 18.5

70/21 41 2.9 43 3.0 44 3.1

80/27 42 3.0 45 3.2 46 3.3 90/32 43 3.0 47 3.3 49 3.4

100/38 43 3.0 47 3.3 50 3.5

WATER TEMP. (ºF/ºC)

3330

3372

3386

3372

4.2

3.8

3.7 2.2

3.1

3386

3459

3520

3521

726 2.75 634 2.40

3.7

3.0

2.4

212 14.9 224 15.8

3408

3451

3525

3530

3.4

2.9

2.02.4

TOTAL HEAT OF REJECTION FROM CONDENSER

CONDENSER VOLUME 964 CU. IN (SRK-20H)

37,300 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]

Note:

1. Pressure data is recorded at 5 minutes into freezing cycle. The data not in bold should be used for reference only.

2. We reserve the right to make changes in specications and design without prior notice.

Page 31

2. KMS-2000MLH with SRK-20H3

APPROXIMATE ICE PRODUCTION PER 24 HR.

lb./day kg./day APPROXIMATE ELECTRIC

CONSUMPTION

watts 100/38 APPROXIMATE WATER CONSUMPTION PER 24 HR.

gal./day m3/day FREEZING CYCLE TIME

min. 100/38 HARVEST CYCLE TIME

min. 100/38 HEAD PRESSURE

PSIG kg/cm2G

SUCTION PRESSURE

PSIG kg/cm2G

AMBIENT TEMP.

(ºF/ºC) 50/10 70/21 90/32

70/21 1910 866 1850 839 1767 801

80/27 1864 846 1772 804 1687 765

90/32 1850 839 1706 774 1620 735

100/38 1833 831 1686 765 1541 699

70/21

80/27

90/32

70/21 917 3.47

80/27 801 3.03 564 2.14 524 1.98

90/32 765 2.89 397 1.50 329 1.25

100/38 581 2.20 382 1.44 267 1.01

70/21

80/27

90/32

70/21

80/27 90/32

70/21 203 14.3

80/27 211 14.9 229 16.1 250 17.5 90/32 214 15.1 241 16.9 261 18.4

100/38 219 15.4 246 17.3 280 19.7

70/21 40 2.8 41 2.9 44 3.1

80/27 41 2.9 43 3.0 46 3.2 90/32 41 2.9 44 3.1 47 3.3

100/38 42 3.0 45 3.1 50 3.5

WATER TEMP. (ºF/ºC)

3290

3294

3296

3338

4.2

3.8

3.7 2.2

3296

3304

3310

3336

765 2.89 664 2.51

3.7

3.0

2.4

214 15.1 233 16.4

3379

3429

3419

3520

3.3

2.9

2.02.43.0

TOTAL HEAT OF REJECTION FROM CONDENSER

CONDENSER VOLUME 964 CU. IN (SRK-20H3)

36,000 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]

Note:

1. Pressure data is recorded at 5 minutes into freezing cycle. The data not in bold should be used for reference only.

2. We reserve the right to make changes in specications and design without prior notice.

Page 32

IV. Service Diagnosis

WARNING

1. This unit should be diagnosed and repaired only by qualied service personnel to reduce the risk of death, electric shock, serious injury, or re.

2. Risk of electric shock. Use extreme caution and exercise safe electrical practices.

3. Moving parts (e.g., fan blade) can crush and cut. Keep hands clear.

4. CHOKING HAZARD: Ensure all components, fasteners, and thumbscrews are securely in place after the unit is serviced. Make sure that none have fallen into the dispenser unit/storage bin.

5. Make sure all food zones in the icemaker and dispenser unit/storage bin are clean after the unit is serviced. For cleaning procedures, see "VI. Cleaning and Maintenance."

A. Diagnostic Procedure

The diagnostic procedure is basically a sequence check that allows you to diagnose the electrical system and components. Before proceeding, check for correct installation, proper voltage per unit nameplate, and adequate water supply (minimum of 10 PSIG, maximum of 113 PSIG). Check that the 115VAC 10A fuses located in the SRK and KMS are good and that the wire harness is connected correctly. If the icemaker is in alarm, see "IV.B. Control Board Check" or "II.C.2. LED Lights and Audible Alarm Safeties." Check the dip switch settings to assure that S1 dip switch 7 through 10 and S2 dip switch 1 through 6 are in the factory default position. S1 dip switch 1 through 6 are cleaning adjustments and the settings are exible. For factory default settings, see "II.C.3.a) Default Dip Switch Settings." As you go through the procedure, check to assure the components energize and de-energize correctly. If not, those components and controls are suspect. To check voltages coming from CB, a diagnostic connector is provided. See Fig. 1. When checking high-voltage, always choose a neutral (W wire) to establish a good neutral connection.

Fig. 1

Page 33

1) Turn off the power supply, then access the control box. Clear any ice from BC.

2) Turn on the power supply, then move the control switch to the "ICE" position. A 5-second delay occurs. CB red "POWER OK" LED turns on. If CB red "POWER OK" LED is ashing (indicating a full bin), clear ice away form BC. If bin is empty, see "IV.C.1. Bin Control Check."

3) 1-Minute Fill Cycle – LED 8 is on. WV energizes. After 1 minute, CB checks for a closed F/S. If F/S is closed, harvest cycle begins. If closed, continue to step 4. If open, WV remains energized through additional 1-minute ll cycles until water lls the water tank and closes F/S (low water safety). Diagnosis: Conrm that water is lling the water tank. If not, check that the water supply shut-off valve is open and WV screen and any external lters are clear. If WV does not energize (LED 8 on), check the diagnostic connector pin #5 (O wire) to a neutral (W wire) for 115VAC. If no voltage is present, replace CB. If voltage is present, check WV connections and solenoid continuity. If unit fails to start harvest, check for open F/S or bad 1-minute timer in CB. See "IV.D. Float Switch Check and Cleaning."

4) Initial Harvest Cycle – LEDs 5, 6, and 8 are on. WV remains energized. Comp, FMRs, and HGVs 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 3.9kΩ from the thermistor and turns harvest termination over to the harvest timer (S1 dip switch1 &2). For details, see "II.C.3.b) Harvest Timer (S1 dip switch 1 & 2)." The pump-out timer (S1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 (S1 dip switch 3 & 4)." WV is energized during harvest for a maximum of 6 minutes or the length of harvest minus 50seconds (harvest pump timer (S1 dip switch 7 & 8)), whichever is shorter. 50seconds before the harvest timer terminates, LED 8 turns off and WV de-energizes. Harvest Pump Timer: LEDs 5, 6, and 7 are on. LED 7 turns on and PM energizes for the last 50 seconds of harvest. NOTICE! S1 dip switch 7 & 8 must remain in the

factory default position of 7 on and 8 on. Otherwise, PM will not energize for 50seconds at the end of harvest. Comp, FMRs, and HGVs remain energized. 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. Diagnosis: Check that Comp, FMRs, and HGVs energize. Average initial harvest cycle at factory setting is 2 to 3 minutes. 1.5minutes after initial harvest begins, touch Comp discharge line. Is it hot? If not, check that Comp is energized and HGVs are energized and open. If not, check the diagnostic connector pin #2(Pwire) to a neutral (W wire) for 115VAC. Check that LLVs are de-energized and closed. Conrm proper unit pressures. Place a thermometer on the suction line next to the thermistor. If 48°F (9°C) has been reached, but WV does not de-energize 50 seconds before the harvest timer should terminate, check the thermistor. See "IV.E. Thermistor Check." If the thermistor reading is in the proper range and CB fails to terminate the harvest cycle and initiate the freeze cycle, replace CB.

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Harvest Pump Timer: PM energizes (LED 7 on) last 50 seconds of harvest. If not, make sure CB S1 dip switch 7 and 8 are in the factory default position. Check diagnostic connector pin #3 (V wire) to a neutral (W wire) for 115VAC. If 115VAC is present, check PM windings and capacitor. If 115VAC is not present, replace CB. If 1-minute ll cycle starts after harvest, see "IV.D. Float Switch Check and Cleaning."

5) Freeze Cycle – LEDs 5 & 7 are on. Comp, FMRs, and PM remain energized. LLVs energize, HGVs de-energize. CB monitors the cooling of the evaporator via the thermistor located on the suction line. When the temperature drops to 36°F (2°C), CBreads 5.5 kΩ from the thermistor and starts the 5-minute short cycle protection timer. CBdoes not monitor F/Suntil the 5-minute short cycle protection timer terminates. After the 5-minute short cycle protection timer terminates, CB1-minute default rell timer starts (LED 9 is on during CB 1-minute default rell). The KMS-2000MLH is not wired for the 1-minute default rell. When CB 1-minute default rell 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 is open for 15continuous seconds. Anti-Slush Control: LEDs 5 is on. Comp, FMRs, and LLVs remain energized. PM de-energizes for 10 seconds. CB monitors the cooling of the evaporator via the thermistor located on the suction line. When the temperature drops to 34°F(1°C), CB reads 5.8kΩ from the thermistor, then LED 7 turns off and PM de-energizes for 10 seconds. NOTICE! Do not adjust S2 dip switch 6 out of the factory default

position on this model. This setting helps prevent slushing during the freeze cycle. Diagnosis: Check that Comp, FMRs, and PM remain energized. Conrm that

evaporator temperature drops. If not, conrm that LLVs are energized and open (LED 6off). If not, check the diagnostic connector pin #1(BKwire) to a neutral (W wire) for 115VAC. Next, check that WV and HGVs are de-energized and closed (not leaking by). Conrm proper unit pressures and TXV operation, check for an inoperative HM or an inefficient Comp. Quick Check: Once the freeze cycle begins, disconnect the thermistor and F/Sfrom the control box. LED 5 turns off and PM de-energizes for 10seconds. If not, conrm that S2 dip switches 5 and 6 are in the factory default position. If they are in their correct positions, and PM does not de-energize and energize 10 seconds later, replaceCB. CB5-minute short cycle protection timer starts as soon as the thermistor is disconnected. CBdoes not monitor F/S until the 5-minute short cycle protection timer terminates. When the 5-minute short cycle protection timer terminates, CB monitors UF/S for a continuous 15 second open condition. With no UF/S on the KMS-2000MLH, CB 1-minute default rell timer starts (LED 9 is on during CB 1-minute default rell). TheKMS-2000MLH is not wired for the CB 1-minute default rell. After CB 1-minute default rell timer terminates, CB monitors LF/S for a continuous 15-second open condition. When LF/S is open continuously for 15seconds, CB terminates the freeze cycle and initiates the next cycle. If not, replace CB. For F/S check, see "IV.D. Float Switch Check and Cleaning." To check the thermistor, see "IV.E. Thermistor Check."

Note: Normal freeze cycle will last 30 to 35 minutes depending on model and

conditions. Cycle times and pressures should follow performance data provided in this manual. See "III.C. Performance Data."

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6) Pump-Out Cycle – (10 second pump-out) – LEDs 5, 6, 4, and 7 are on. Comp and FMRs remain energized. HGVs energize. LLVs de-energize. PMde-energizes for 2 seconds, then PM and DV energize for 10seconds. Diagnosis: PM Operation: If PM does not energize, conrm S2 dip switch 1 is in the factory default position. See "II.C.3.g) Pump-Out/Drain Selector (S2 dip switch 1). Check diagnostic connector pin #3 (V wire) to a neutral (W wire) for 115VAC. If LED 7 is on and 115VAC is not present, replace CB. If 115VAC is present and PM is still not energized, check control switch conitinuity between terminal #3 (V wire) and terminal #2 (R wire). If closed, check PM windings and capacitor. DV Operation: If PM energizes and water does not pump out, remove DV housing and check/clean DV assembly. Make sure the drain line is not clogged. Next, check the diagnostic connector pin #7 (GYwire) to a neutral (W wire) for 115VAC. If 115VAC is not present, replace CB. If 115VAC is present, check continuity on DV coil.

7) Normal Harvest Cycle – Same as the initial harvest cycle. Return to step 4. Note: Unit continues to cycle until BC is satised or power is switched off. The unit

always restarts at the 1-minute ll cycle.

8) Shutdown – LEDs 4 and 7 are on: When BC is activated (BC open), CB red "POWER OK" LED ashes. There is a delay before the shutdown sequence begins. The delay varies depending on the cycle the icemaker is in at the time of activation. For details, see the table below.

Cycle at Bin Control Activation Delay Before Shutdown Sequence Begins

Fill Cycle 15 seconds

Harvest Cycle 15 seconds after the next freeze cycle starts

Freeze Cycle 15 seconds if BC is activated between the beginning of freeze and

on this model. This dip switch must be left in the factory default position or this unit will not operate correctly. For details, see "II.C.3.g) Pump-Out/Drain Selector

(S2dipswitch1)." The water tank drains for a maximum of 5 minutes or until F/S opens. DVand PM then de-energize. When BC closes again calling for ice, the unit starts at the 1-minute ll cycle. There is a 90-second minimum off time before the icemaker can restart. Diagnostics: Disconnect BC from the control box. CB red "POWER OK" LED begins ashing. If not, replace CB. Next, check for continuity across BC. BC should be closed when actuator paddle is not engaged. Press the actuator paddle, check BC continuity. BC should be open when actuator paddle is engaged. For further details, see "IV.C. Bin Control Check and Cleaning."

Legend: BC–bin control; CB–control board; Comp–compressor; DV–drain valve;

FMRs–fan motors-remote; F/S–oat switch; HGVs–hot gas valves; HM–headmaster (C.P.R.); LF/S–lower oat switch; LLVs–liquid line valves; PM–pump motor; TXVs–thermostatic expansion valves; UF/S–upper oat switch; WV–inlet water valve

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B. Control Board Check

Before replacing a control board that does not show a visible defect and that you suspect is bad, always conduct the following check procedure. This procedure will help you verify your diagnosis. Always choose a neutral (W wire) to establish a good neutral connection when checking voltages.

Alarm Reset: If CB is in alarm (beeping), press the "ALARM RESET" button on CB while

CB is beeping. WARNING!Risk of electric shock. Care should be taken not to touch live terminals. Once reset, the unit starts at the 1-minute ll cycle. For audible alarm information, see "II.C.2. LED Lights and Audible Alarm Safeties."

1) Check the dip switch settings to assure that S1 dip switch 7 through 10, and S2 dip switch 1 through 6 are in the factory default position. S1 dip switch 1 through 6 are cleaning adjustments and the settings are exible. For factory default settings, see "II.C.3.a) Default Dip Switch Settings."

2) The KMS-2000MLH utilizes CB version 2.5. See the label located on CB for CB version or follow the steps below to determine CB version.

a) With the control switch in the "OFF" position, press and hold the "OUTPUT TEST"

and "ALARM RESET" buttons.

b) Continue holding the buttons and move the control switch to the "ICE" position.

c) A tone sounds indicating CB is in "test mode". While continuing to hold down the

“OUTPUT TEST” button, release the "ALARM RESET" button.

d) As long as the "OUTPUT TEST" button is held down, CB indicates the version

using beeps. The rst set of beeps indicates the major version level and the second set of beeps indicates the minor version level. Example: 2 beeps followed by 5beeps=version 2.5

e) Move the control switch to the "OFF" position to exit "test mode".

3) Clear any ice away from BC. Move the control switch to the "ICE" position. If CB red "POWER OK" LED turns on, control voltage is good, continue to step 4. If CB red "POWER OK" LED is off, check CT secondary circuit. CT output is 10.5VAC at 115VAC primary input. If CT secondary circuit has proper voltage and CB red "POWER OK" LED is off, replace CB. If CT secondary circuit does not have proper voltage, check CT primary circuit. Check for 1115VAC at the diagnostic connector pin #4 (P wire) to a neutral (W wire). For additional checks, see "IV.F.1. No Ice Production." If CB red "POWER OK" LED is ashing, conrm BC connections, clear any ice from BC actuator paddle. If CB red "POWER OK" is still ashing and no BC issues are present, replace CB.

4) The "OUTPUT TEST" button provides a relay sequence test. Move the control switch to the "OFF" position. While pressing the "OUTPUT TEST" button, move the control switch back to the "ICE" position. The correct LED lighting sequence is 5, 6, 7, 8, 9, 4. Note that the order of the LEDs from the outer edge of CB is 5, 6, 8, 9, 4, 7. Components (e.g.,Comp) cycle during the test. Each LED stays on for 5 seconds. LED 5 stays on while LED 6 is on. CB red "POWER OK" LED ashes once when the rst relay LED turns on, twice when the second relay LED turns on, and adds one ash for each LED thereafter. A beep also sounds as each LED turns on. Following the test, the icemaker resumes operation. If the LEDs do not turn on as described above, replace CB.

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5) Utilize the diagnostic connector (Fig. 1.) to verify output voltage from CB to components. With the unit in the cycle to be tested, check CB output voltage from the corresponding terminal on the diagnostic connector to a neutral (Wwire). If output voltage is not present and the appropriate LED is on, replace CB.

Legend: BC–bin control; CB–control board; Comp–compressor; CT–control transformer.

C. Bin Control Check and Cleaning

This unit uses a BC with a lever-actuated proximity switch to control the ice level in the storage bin. No adjustment is required. When calling for ice, BC proximity switch is closed (CB red "POWER OK" LED on). When BC actuator paddle is engaged, BC proximity switch is open (CB red "POWER OK" LED ashing) and CB shuts down the unit according to the chart below.

Cycle at Bin Control Activation Delay Before Shutdown Sequence Begins

Fill Cycle 15 seconds

Harvest Cycle 15 seconds after the next freeze cycle starts

Freeze Cycle 15 seconds if BC is activated between the beginning of freeze and

WARNING

CHOKING HAZARD: Ensure all components, fasteners, and thumbscrews are

securely in place after the unit is serviced. Make sure that none have fallen into the dispenser unit/storage bin.

1. Bin Control Check

To check BC, follow the steps below.

1) Turn off the power supply.

2) Remove the front panel, then move the control switch to the "OFF" position.

3) Clear any ice away from BC.

4) Remove the control box cover, then disconnect CB K1 wire harness connector from the control board. See "II.C.1. Control Board Layout."

5) Check for continuity across CB K1 wire harness connector pins #4 and #5 (BK wires). When the actuator paddle is not engaged, BC switch is closed. If open, check that the actuator paddle is not sticking and that the K1 wire harness BC connector is properly secured. Clean BC if necessary. See "IV.C.2. Bin Control Cleaning." If BC switch still reads open, replace BC.

6) Press the actuator paddle, check for continuity across CB K1 wire harness connector pins #4 and #5 (BK wires). When the actuator paddle is engaged, the BC switch is open. If closed, check that the actuator paddle is not restricted. Clean if necessary. See "IV.C.2. Bin Control Cleaning." If BC switch still reads closed, replace BC.

7) Reconnect CB K1 wire harness connector to the control board.

8) Turn on the power supply, then move the control switch to the "ICE" position.

9) Check that CB red "POWER OK" LED is on and not ashing.

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10) Allow the unit to cycle on. During the 1-minute ll cycle, press the actuator in and hold it in for 15 seconds. Check that CB red "POWER OK" LED ashes, and after the actuator is held in for 15 seconds, PM and DV energize (maximum time 5 minutes) and the water tank drains. After the water tank drains and F/S opens, the unit shuts down. If the water tank does not drain, check for a clogged drain line, defective DV or PM. If F/S fails to open after the water tank drains, see "IV.D. Float Switch Check and Cleaning." If F/S checks out and the unit will not shut down, replace CB.

11) Replace the control box cover and front panel in their correct positions.

12) Turn on the power supply to start the automatic icemaking process.

Legend: BC–bin control, CB–control board, DV–drain valve; F/S–oat switch; PM–pump

motor

2. Bin Control Cleaning

Scale may build up on BC. Scale can cause the actuator paddle and magnet to stick. In this case, BC should be cleaned.

1) Turn off the power supply.

2) Remove the front panel, then move the control switch to the "OFF" position.

3) Clear any ice away from BC.

4) Remove the top and right side panels.

BC Cable Connector

5) Disconnect CB K1 wire harness BCconnector from the BC cable connector, then remove BC from the unit.

6) Remove the actuator paddle from the

BC Cable

Switch Mount

switch mount. See Fig. 2.

7) Wipe down BC with a mixture of 1 part Hoshizaki "Scale Away" and 25 parts warm water. Rinse the parts thoroughly with clean water.

8) Reassemble BC and replace it in its correct position. Note: If the magnet was removed for

cleaning, be sure to replace it in its correct position.

9) Reconnect BC cable connector to CB K1wire harness BC connector.

10) Move the control switch to the "ICE" position.

11) Replace the right side, top, and front panels in their correct positions.

12) Turn on the power supply to start the automatic icemaking process.

Legend: BC–bin control; CB–control board

Actuator Paddle

Magnet

BC Cable

BC Cable Connector

Proximity Switch

Actuator Paddle

Fig. 2

Page 39

D. Float Switch Check and Cleaning

A single F/S is used to determine that there is sufficient water in the water tank after the 1-minute ll cycle and after each harvest cycle. The F/S is also used to determine that the appropriate volume of water has been converted into ice before switching out of the freeze cycle. No adjustment is required.

1. Float Switch Check

To check F/S, follow the steps below.

1) Turn off the power supply.

2) Remove the front panel and move the control switch to the "SERVICE" position. Move the service switch to the "DRAIN" position.

3) Turn on the power supply.

4) Allow the water to drain from the water tank, then move the control switch to the "OFF" position.

5) Turn off the power supply.

6) Remove the control box cover, then disconnect CB K1 wire harness connector from the control board. See "II.C.1. Control Board Layout."

7) Check for continuity across CB K1 wire harness connector pins #1 and #3 (R wires). With the water tank empty, the oat switch is open. If open, continue to step 8. If closed, follow the steps in "IV.D.2. Float Switch Cleaning." After cleaning the oat switch, check it again. Replace if necessary.

8) Reconnect CB K1 wire harness connector to the control board, then replace the control box cover in its correct position.

9) Move the control switch to the "ICE" position. Replace the front panel in its correct position, then turn on the power supply. After 1 minute, the 1-minute ll cycle should end and the initial harvest cycle should begin. If the initial harvest cycle begins, F/S is good and the check is complete. If the initial harvest cycle does not begin, continue to step

10.

10) Turn off the power supply.

11) Remove the front panel. Move the control switch to "OFF" position.

12) Remove the control box cover, then disconnect CB K1 wire harness connector from the control board.

13) Check for continuity across CB K1 wire harness connector pins #1 and #3 (R wires). With the water tank full, F/S is closed. If F/S is closed and the icemaker will not switch from the 1-minute ll cycle to the initial harvest cycle, replace CB.

If F/S is open, conrm that the CB K1 wire harness F/S connector has a good connection with the F/S cable connector and that the water tank is full. If the water tank is not full, check the water supply, water lters, and WV. If the water tank is full, follow the steps in "IV.D.2. Float Switch Cleaning." After cleaning F/S, check it again. Replace if necessary.

Page 40

2. Float Switch Cleaning

Depending on local water conditions, scale may build up on F/S. Scale can cause F/S to stick. In this case, F/S should be cleaned.

1) Turn off the power supply.

2) Remove the front panel, then move the control switch to the "SERVICE" position. Move the service switch to the "DRAIN" position. Replace the front panel in its correct position.

3) Turn on the power supply.

4) Allow the water to drain from the water tank.

5) Turn off the power supply. Remove the front panel, then move the control switch to the "OFF" position.

6) Disconnect F/S cable connector from CB K1 wire harness F/S connector located on the control box.

7) Remove the top and right side panels.

8) Disconnect the ush tube from the top of F/S housing, then remove F/S assembly from the mounting bracket and remove the rubber boot from the bottom of F/S assembly.

9) Remove the retainer rod from the bottom of F/S assembly, then remove the oat. Be careful not to bend the retainer rod excessively when removing it.

10) Wipe down F/S assembly's housing, shaft, oat, and retainer rod with a mixture of 1part Hoshizaki "Scale Away" and 25 parts warm water. Clean the inside of the rubber boot and hose with cleaning solution. Rinse the parts thoroughly with clean water.

11) Reassemble F/S assembly and replace it and the rubber boot in their correct positions. Reconnect the ush tube.

12) Reconnect F/S cable connector to CB K1wire harness F/S connector located on the control box.

13) Replace the right side and top panels in their correct positions.

14) Move the control switch to the "ICE" position.

Housing

Retainer Rod

Rubber Boot and Hose

Shaft

Float

15) Replace the front panel in its correct position.

16) Turn on the power supply to start the automatic icemaking process.

Legend: CB–control board; F/S–oat switch; WV–inlet water valve

Fig. 3

Page 41

E. Thermistor Check

To check thermistor resistance, follow the steps below.

1) Turn off the power supply.

2) Remove the front panel, then move the control switch to the "OFF" position.

3) Remove the top and right side panels.

4) Remove the thermistor from the suction line.

5) Immerse the thermistor sensor portion in a glass containing ice and water for 2 or 3 minutes.

6) Remove the control box cover, then disconnect CB K1 wire harness connector from CB. See "II.C.1. Control Board Layout."

7) Check the resistance between CB K1 wire harness connector pins #6 and #7 (O wires). Normal range is 4.7 to 6.2 kΩ. If open, conrm that CB K1 wire harness thermistor connector has a good connection with the thermistor cable connector located on the control box. If outside the normal range, replace the thermistor. See "V.B. Important Notes for Component Replacement." If within the normal range, continue to step 8.

8) Replace the thermistor in its correct position. See "V.B. Important Notes for Component Replacement."

9) Reconnect CB K1 wire harness connector to CB, then replace the control box cover in its correct position.

10) Move the control switch to the "ICE" position. Replace the right side, top, and front panels in their correct positions.

11) Turn on the power supply.

12) Once the harvest cycle starts (Comp energizes), begin timing the harvest cycle.

13) The harvest timer and harvest cycle should terminate within 2 to 5 minutes. If the harvest cycle does not terminate within 2 to 5 minutes, replace CB.

Legend: CB–control board; Comp–compressor

Page 42

F. Diagnostic Charts

Before consulting the diagnostic charts, check for correct installation, proper voltage per unit nameplate, and adequate water supply. Check CB using the steps in "IV.B. Control Board Check." Check the dip switch settings to assure that S1 dip switch 7 through 10and S2 dip switch 1 through 6 are in the factory default position. S1 dip switch 1 through 6 are cleaning adjustments and the settings are exible. For factory default settings, see "II.C.3.a) Default Dip Switch Settings."

1. No Ice Production

No Ice Production - Possible Cause

1. Power Supply a) Off, blown fuse, or tripped breaker.

b) Not within specications.

2. Main Transformer (208-230V/115V) (3 Phase Only)

3. Water Supply a) Water supply off or improper water pressure.

4. Fuse (SRK Control Box) a) Blown.

5. High-Pressure Switch (SRK) a) Dirty condenser.

6. Discharge Line Thermostat (SRK)

7. Wire Harness (From SRK to KMS)

8. Fuse (KMS Control Box) a) Blown.

9. Control Switch a) In "SERVICE" or "OFF" position.

10. Control Transformer (115V/10.5V)

11. Control Board See "IV.B. Control Board Check"

12. Bin Control See "IV.C. Bin Control Check and Cleaning"

13. Inlet Water Valve a) Screen or orice clogged.

14. Drain Valve a) Dirty, leaking by.

a) Voltage tap switch not set to proper voltage.

b) Coil winding open or shorted.

b) External water lters clogged.

b) Condensing unit fans not operating.

c) Headmaster (C.P.R.) open.

d) Refrigerant overcharged.

e) Bad contacts.

f) Refrigerant lines or components plugged.

a) Ambient temperature too warm.

b) Compressor or compressor components faulty.

c) Defective.

d) Hot gas valves open.

e) Dirty condenser.

f) Condensing unit fans not operating.

a) Disconnected or loose connection.

b) Bad contacts.

a) Coil winding open or shorted.

a) In alarm.

b) BC open, CB red "POWER OK" LED ashing (bin full).

c) Defective.

a) Tripped with bin lled with ice.

b) Actuator does not move freely.

c) Defective.

b) Coil winding open.

c) Open in freeze cycle.

Page 43

No Ice Production - Possible Cause

15. Float Switch See "IV.D. Float Switch Check and Cleaning"

16. Compressor a) Magnetic contactor contacts bad or coil winding open.

1 7. Hot Gas Valves (KMS & SRK) a) Closed in harvest cycle.

18. Thermistor See "IV.E. Thermistor Check"

19. Pump Motor a) Motor winding open.

20. Thermostatic Expansion Valves a) Bulb loose.

2 1. Liquid Line Valves (KMS & SRK) a) Closed in freeze cycle.

22. Remote Fan Motors (SRK) a) Motor winding open.

23. Headmaster (C.P.R.) a) Defective.

24. Water System a) Water leaks causing short freeze time.

a) Float does not move freely.

b) Defective.

b) Start capacitor or run capacitor defective (single phase only).

c) Internal protector open.

d) Start relay contacts bad or coil winding open (single phase only).

e) Compressor defective.

b) Open in freeze cycle.

a) Loose, disconnected, or defective.

b) Bearing worn out or locked rotor.

c) Defective capacitor.

d) Mechanical seal worn out.

b) Operating erratically.

b) Open in harvest cycle.

b) Bearing worn out or locked rotor.

c) Defective capacitor.

2. Freeze-Up

Defrost and clean the unit prior to diagnosing a freeze-up. See "VI.A. Cleaning and Sanitizing Instructions." Fill out a freeze-up checklist. The freeze-up checklist can be found in the Hoshizaki Technician's Pocket Guide or contact your local distributor for a copy of the freeze-up checklist.

Freeze-Up - Possible Cause

Harvest Cycle

1. Evaporator a) Scaled up.

b) Damaged.

2. Cube Guides a) Out of position.

b) Damaged.

3. Spray Tubes and/or Spray Guides

4. Water Supply a) Low water pressure.

5. Inlet Water Valve a) Screen or orice clogged.

a) Dirty.

b) Out of position.

b) External water lters clogged.

c) Insufficient water line size.

Minimum 3/8" nominal ID copper water tubing or equivalent.

b) Defective.

Page 44

Freeze-Up - Possible Cause

6. Float Switch See "IV.D. Float Switch Check and Cleaning"

7. Refrigerant Charge a) Low.

8. Control Board See "II.C.3. Controls and Adjustments" and "IV.B. Control Board Check"

9. Bin Control See "IV.C. Bin Control Check and Cleaning"

10. Thermistor See "IV.E. Thermistor Check"

11. Thermostatic Expansion Valves a) Defective.

12. Hot Gas Valves (KMS & SRK) a) Closed or restricted.

13. Liquid Line Valves (KMS & SRK) a) Open.

1. Evaporator a) Scaled up.

2. Spray Tubes and/or Spray Guides

3. Refrigerant Charge a) Low.

4. Control Board See "IV.B. Control Board Check"

5. Inlet Water Valve a) Leaking by.

6. Float Switch See "IV.D. Float Switch Check and Cleaning"

7. Pump Motor a) RPM too slow.

8. Thermostatic Expansion Valves a) Bulb loose or defective.

9. Headmaster (C.P.R.) a) Defective.

a) Dirty, sticking.

b) Defective.

a) Harvest timer (S1 dip switch 1 & 2) set too short.

b) Harvest pump timer (S1 dip switch 7 & 8) not in factory default

position.

c) Defective.

a) Actuator does not move freely.

a) Loose, disconnected, or defective.

Freeze Cycle

b) Damaged.

a) Dirty.

b) Out of position.

a) Freeze timer (S1 dip switch 9 & 10) set incorrectly.

b) Anti-slush control (S2 dip switch 6) not in factory default position.

c) Defective.

a) Float does not move freely.

b) Defective.

b) Impeller damaged.

Page 45

3. Low Ice Production

Low Ice Production - Possible Cause

Long Harvest Cycle

1. Evaporator a) Scaled up.

2. Spray Tubes and/or Spray Guides

3. Refrigerant Charge a) Low.

4. Water Supply a) Low water pressure.

5. Control Board See "IV.B. Control Board Check"

6. Thermistor See "IV.E. Thermistor Check"

7. Hot Gas Valves (KMS & SRK) a) Erratic or closed.

8. Inlet Water Valve a) Screen or orice clogged.

9. Compressor a) Inefficient or off.

10. Liquid Line Valves (KMS & SRK) a) Erratic or closed.

11. Thermostatic Expansion Valves a) Defective.

12. Headmaster (C.P.R.) a) Defective.

1. Float Switch See "IV.D. Float Switch Check and Cleaning"

2. Inlet Water Valve a) Restricted.

3. Control Board See "IV.B. Control Board Check"

4. Drain Valve a) Dirty, leaking by.

1. Evaporator a) Scaled up, dirty.

2. Float Switch See "IV.D. Float Switch Check and Cleaning"

3. Inlet Water Valve a) Leaking by.

4. Thermistor See "IV.E. Thermistor Check"

5. Hot Gas Valves (KMS & SRK) a) Erratic or open.

6. Condenser a) Clogged.

7. Control Board See "IV.B. Control Board Check"

a) Dirty.

b) Out of position.

b) External water lters clogged.

c) Insufficient water line size.

Minimum 3/8" nominal ID copper water tubing or equivalent.

d) Too cold.

a) Thermistor connection loose.

b) Defective.

a) Loose, disconnected, or defective.

Short Freeze Cycle

a) Scaled up, dirty.

b) Float sticking.

c) Defective switch.

a) Float switch connection loose.

b) Defective.

Long Freeze Cycle

a) Scaled up, dirty.

b) Float sticking.

c) Defective switch.

a) Loose, disconnected, or defective.

a) Float switch connection loose.

b) Thermistor connection loose.

c) Defective.

Page 46

Low Ice Production - Possible Cause

8. Refrigerant Charge a) Low.

9. Thermostatic Expansion Valves a) Bulb loose.

b) Defective.

10. Compressor a) Inefficient or off.

11. Pump Motor a) RPM too slow.

b) Impeller damaged.

12. Liquid Line Valves (KMS & SRK) a) Erratic or closed.

13. Headmaster (C.P.R.) a) Not bypassing.

Page 47

V. Replacement of Components

1. This unit should be diagnosed and repaired only by qualied service personnel to reduce the risk of death, electric shock, serious injury, or re.

2. Move the control switch to the "OFF" position and turn off the power supply before servicing. Lockout/Tagout to prevent the power from being turned back on inadvertently.

3. CHOKING HAZARD: Ensure all components, fasteners, and thumbscrews are securely in place after the unit is serviced. Make sure that none have fallen into the storage bin.

4. Make sure all food zones in the icemaker and storage bin are clean after the unit is serviced. For cleaning procedures, see "VI. Cleaning and Maintenance."

A. Service for Refrigerant Lines

1. Repairs requiring the refrigeration circuit to be opened must be performed by properly trained and EPA-certied service personnel.

WARNING

2. Always recover the refrigerant and store it in an approved container. Do not discharge the refrigerant into the atmosphere.

3. Use an electronic leak detector or soap bubbles to check for leaks. Add a trace of refrigerant to the system (if using an electronic leak detector), and then raise the pressure using nitrogen gas (140 PSIG). DO NOT use R-404A as a mixture with pressurized air for leak testing.

NOTICE

1. Do not leave the system open for longer than 15 minutes when replacing or servicing parts. The Polyol Ester (POE) oils used in R-404A units can absorb moisture quickly. Therefore it is important to prevent moisture from entering the system when replacing or servicing parts.

2. Always install a new drier every time the sealed refrigeration system is opened.

3. Do not replace the drier until after all other repair or replacement has been made. Install the new drier with the arrow on the drier in the direction of the refrigerant ow.

4. When brazing, protect the drier by using a wet cloth to prevent the drier from overheating. Do not allow the drier to exceed 250°F (121°C).

1. Refrigerant Recovery

The icemaker is provided with refrigerant service valves. Using proper refrigerant practices, recover the refrigerant from the service valves and store it in an approved container. Do not discharge the refrigerant into the atmosphere.

Page 48

2. Brazing

WARNING

1. R-404A itself is not ammable at atmospheric pressure and temperatures up to 176°F (80°C).

2. R-404A itself is not explosive or poisonous. However, when exposed to high temperatures (open ames), R-404A can be decomposed to form hydrouoric acid and carbonyl uoride both of which are hazardous.

3. Do not use silver alloy or copper alloy containing arsenic.

4. Use an electronic leak detector or soap bubbles to check for leaks. Add a trace of refrigerant to the system (if using an electronic leak detector), and then raise the pressure using nitrogen gas (140 PSIG). DO NOT use R-404A as a mixture with pressurized air for leak testing.

1) Braze all ttings while purging with nitrogen gas owing at a pressure of 3 to 4 PSIG. Note: Because the pipes in the evaporator case are specially coated to resist corrosion,

it is important to make connections outside the evaporator case when possible. If it is necessary to braze inside the evaporator case, use sandpaper to remove the coating from the brazing connections before unbrazing the components.

NOTICE

1. Always install a new drier every time the sealed refrigeration system is opened.

2. Do not replace the drier until after all other repair or replacement has been made. Install the new drier with the arrow on the drier in the direction of the refrigerant ow.

3. When brazing, protect the drier by using a wet cloth to prevent the drier from overheating. Do not allow the drier to exceed 250°F (121°C).

2) Use an electronic leak detector or soap bubbles to check for leaks. Add a trace of refrigerant to the system (if using an electronic leak detector), and then raise the pressure using nitrogen gas (140 PSIG). DO NOT use R-404A as a mixture with pressurized air for leak testing.

3. Evacuation and Recharge (R-404A)

1) Attach a vacuum pump to the system. Be sure to connect the charging hoses to both high and low-side service valves.

IMPORTANT

The vacuum level and vacuum pump may be the same as those for current refrigerants. However, the rubber hose and gauge manifold to be used for evacuation and refrigerant charge should be exclusively for POE oils.

2) Turn on the vacuum pump. Open the gauge manifold valves, then open the high and low-side service valves. Never allow the oil in the vacuum pump to ow backwards.

Page 49

3) Allow the vacuum pump to pull down to a 29.9" Hg vacuum. Evacuating period depends on pump capacity.

4) Close the low-side valve and high-side valve on the gauge manifold.

5) Disconnect the gauge manifold hose from the vacuum pump and attach it to a refrigerant service cylinder. Remember to loosen the connection and purge the air from the hose. See the nameplate on the SRK for the required refrigerant charge. Hoshizaki recommends only virgin refrigerant or reclaimed refrigerant which meets ARI Standard 700 (latest edition) be used.

6) A liquid charge is required when charging an R-404A system (to prevent fractionation). Place the service cylinder on the scales; if the service cylinder is not equipped with a dip tube, invert the service cylinder, then place it on the scales. Open the high-side valve on the gauge manifold.

7) Allow the system to charge with liquid until the proper charge weight is met.

8) If necessary, add any remaining charge to the system through the low-side. NOTICE!To

prevent compressor damage, use a throttling valve or liquid dispensing device to add the remaining liquid charge through the low-side service valve with the unit running.

9) Close the high and low-side service valves. Close the high and low-side gauge manifold valves, then disconnect the gauge manifold hoses.

10) Cap the service valves to prevent a possible leak.

Page 50

B. Important Notes for Component Replacement

NOTICE

When replacing a component listed below, see the notes to help ensure proper operation.

Component Notes

Compressor Install a new start capacitor, run capacitor, and start relay (single phase only).

Thermostatic Expansion Valve

Hot Gas Valves & Liquid Line Valves

Fan Motor Install a new capacitor.

Pump Motor Install a new capacitor.

Thermistor • Attach the new thermistor to the suction line in the same location as the previous

• Attach the expansion valve bulb to the suction line in the same location as the previous bulb.

• The bulb should be between the 10 and 2 o'clock positions on the tube.

• Secure the bulb with the clamp and holder, then insulate it.

• Replace the strainer when replacing a hot gas valve.

• Use copper tube of the same diameter and length when replacing valve lines.

thermistor.

• Smoothly ll the recessed area of the thermistor holder with high thermal conductive type sealant. Hoshizaki America part number 4A0683-01 (Silicone Heat Sink Compound 10-8108 manufactured by GC Electronics), KE-4560 RTV (manufactured by ShinEtsu Silicones), or equivalent are recommended.

• Secure the thermistor with the holder, then insulate it.

• Be very careful to prevent damage to the leads.

Thermistor Lead

Foam Insulation

Thermistor Holder

Cable Tie

Page 51

VI. Cleaning and Maintenance

This icemaker must be cleaned and maintained in accordance with the instruction manual and labels provided with the icemaker. Consult with your local distributor about cleaning and maintenance service. To obtain the name and phone number of your local distributor, visit www.hoshizaki.com or call Hoshizaki Technical Support at 1-800-233-1940 in the USA.

WARNING

1. Only qualied service technicians should attempt to service this icemaker.

2. CHOKING HAZARD: Ensure all components, fasteners, and thumbscrews are securely in place after any cleaning or maintenance is done to the unit. Make sure that none have fallen into the dispenser unit/storage bin.

3. The dispenser unit/storage bin is for ice use only. Do not store anything else in the dispenser unit/storage bin.

A. Cleaning and Sanitizing Instructions

Hoshizaki recommends cleaning and sanitizing this unit at least once a year. More frequent cleaning and sanitizing, however, may be required in some existing water conditions.

WARNING

1. To prevent injury to individuals and damage to the icemaker, do not use ammonia type cleaners.

2. Carefully follow any instructions provided with the bottles of cleaning and sanitizing solution.

3. Always wear liquid-proof gloves and goggles to prevent the cleaning and sanitizing solutions from coming into contact with skin or eyes.

4. To prevent damage to the water pump seal, do not operate the icemaker with the control switch in the "SERVICE" position when the water tank is empty.

1. Cleaning Procedure

1) Dilute 27 . oz. (800 ml) of Hoshizaki "Scale Away" with 5 gal. (19 l) of warm water.

2) Remove all ice from the evaporator and the dispenser unit/storage bin. Note: To remove cubes on the evaporator, turn off the power supply and turn it back on

after 3 minutes. The harvest cycle starts and the cubes will be removed from the evaporator.

3) Turn off the power supply.

4) Remove the front panel, then place the control switch in the "SERVICE" position. Then place the service switch in the "DRAIN" position.

5) Replace the front panel in its correct position, then turn on the power supply for 2 minutes.

6) Turn off the power supply.

7) Remove the front panel.

Page 52

8) In bad or severe water conditions, clean the oat switch as described below. Otherwise, continue to step 9.

a. Remove the right side panel. b. Disconnect the ush tube from the top of the oat switch housing, then remove the

oat switch assembly. Remove the rubber boot from the bottom of the assembly.

c. Remove the retainer rod from the bottom of the oat switch housing, then remove

the oat. Be careful not to bend the retainer rod excessively when removing it

d. Wipe down the oat switch assembly housing, shaft, oat, and retainer rod with

cleaning solution. Clean the inside of the rubber boot and hose with cleaning solution. Rinse the parts thoroughly with clean water.

e. Reassemble the oat switch assembly and replace it and the rubber boot in their

correct positions. Reconnect the ush tube.

f. Replace the right side panel in its correct position.

9) Remove the insulation panel by removing the thumbscrews, then pour the cleaning solution into the water tank.

10) Move the service switch to the "WASH" position.

11) Replace the insulation panel and the front panel in their correct positions.

12) Turn on the power supply to start the washing process.

13) Turn off the power supply after 30 minutes. Remove the front panel.

14) Move the service switch to the "DRAIN" position.

15) Replace the front panel in its correct position, then turn on the power supply for 2 minutes.

16) Turn off the power supply, then remove the front panel.

17) Move the control switch to the "ICE" position.

18) Replace the front panel in its correct position.

19) Turn on the power supply to ll the water tank with water.

20) Turn off the power supply after 3 minutes.

21) Remove the front panel.

22) Move the control switch to the "SERVICE" position, then move the service switch to the "WASH" position.

23) Replace the front panel in its correct position.

24) Turn on the power supply to rinse off the cleaning solution.

25) Turn off the power supply after 5 minutes.

26) Remove the front panel.

27) Move the service switch to the "DRAIN" position.

28) Replace the front panel in its correct position, then turn on the power supply for 2 minutes.

29) Turn off the power supply. Remove the front panel.

30) Repeat steps 17 through 29 three more times to rinse thoroughly. Note: If you do not sanitize the icemaker, go to step 13 in "2. Sanitizing Procedure."

Page 53

2. Sanitizing Procedure - Following Cleaning Procedure

1) Dilute 2.5 . oz. (74 ml or 5 tbs) of a 5.25% sodium hypochlorite solution (chlorine bleach) with 5 gal. (19 l) of warm water.

2) Remove the insulation panel if it is in its normal position.

3) Pour the sanitizing solution into the water tank.

4) Move the service switch to the "WASH" position.

5) Replace the insulation panel and the front panel in their correct positions.

6) Turn on the power supply to start the sanitizing process.

7) Turn off the power supply after 15 minutes. Remove the front panel.

8) Move the service switch to the "DRAIN" position.

9) Replace the front panel in its correct position, then turn on the power supply for 2 minutes.

10) Turn off the power supply. Remove the front panel.

11) Repeat steps 17 through 29 in "1. Cleaning Procedure" two times to rinse thoroughly.

12) Repeat steps 1 through 11 one more time.

13) Move the control switch to the "ICE" position.

14) Replace the front panel in its correct position.

15) Clean the dispenser unit/storage bin liner using a neutral cleaner. Rinse thoroughly after cleaning.

16) Turn on the power supply to start the automatic icemaking process.

Page 54

B. Maintenance

This icemaker must be maintained individually, referring to the instruction manual and labels provided with the icemaker.

WARNING

1. Only qualied service technicians should attempt to service this icemaker.

2. 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.

1. Stainless Steel Exterior

To prevent corrosion, wipe the exterior occasionally with a clean, soft cloth. Use a damp cloth containing a neutral cleaner to wipe off oil or dirt buildup.

2. Dispenser Unit/Storage Bin and Scoop

• Wash your hands before removing ice. Use the plastic scoop provided (bin accessory).

• The dispenser unit/storage bin is for ice use only. Do not store anything else in the

dispenser unit/storage bin.

• Clean the scoop and the dispenser unit/storage bin liner using a neutral cleaner. Rinse

thoroughly after cleaning.

3. Condenser

Check the condenser once a year, and clean the coil if required by using a brush or vacuum cleaner. More frequent cleaning may be required depending on location.

Page 55

C. Preparing the Icemaker for Long Storage

NOTICE

1. When storing the icemaker for an extended time or in sub-freezing temperatures, follow the instructions below to prevent damage.

2. To prevent damage to the water pump, do not operate the icemaker with the control switch in the "SERVICE" position when the water tank is empty.

When the icemaker is not used for two or three days under normal conditions, it is sufficient to move the control switch to the "OFF" position. When storing the icemaker for an extended time or in sub-freezing temperatures, follow the instructions below.

1. Remove the water from the icemaker water lines:

1) Turn off the power supply, then remove the front panel, right side panel, and control box cover.

2) Move the control switch on the control box to the "OFF" position. Conrm the service switch is in the "CIRC" position.

3) Close the icemaker water supply line shut-off valve and open the icemaker water supply line drain valve. Allow the line to drain by gravity.

4) Attach a compressed air or carbon dioxide supply to the icemaker water supply line drain valve.

5) Turn on the power supply, then move the control switch to the "ICE" position. Conrm that the bin control switch is closed and calling for ice. The control board red "POWER OK" LED should be on and not ashing.

6) Blow the icemaker water supply line out using the compressed air or carbon dioxide supply. This will clear water from the inlet water valve.

7) Move the control switch to the "OFF" position.

8) Disconnect the wash valve hose from the inlet water valve tee, then unplug the water pump connector at the water pump. See Fig. 4.

9) Move the service switch to the "WASH" position, then move the control switch to the "SERVICE" position.

10) From the wash valve hose, blow out the wash valve using the compressed air or carbon dioxide supply. Reconnect the wash valve hose.

11) Move the service switch to the "CIRC" position, then move the control switch to the "OFF" position.

12) Disconnect the oat switch vent hose from the drain hose tee. Move the service switch to the "DRAIN" position, then move the control switch to the "SERVICE" position.

13) From the drain hose tee, blow out the drain valve using the compressed air or carbon dioxide supply. Reconnect the oat switch vent hose.

14) Move the service switch to the "CIRC" position, then move the control switch to the "OFF" position.

15) Turn off the power supply, then reconnect the water pump connector.

16) Close the icemaker water supply line drain valve.

Page 56

2. Remove the water from the water tank:

17) Remove the insulation panel and front frame.

18) Remove the 4 hoses connected to the water tank. Allow the tank and hoses to drain completely. See Fig. 5.

19) Remove all ice from the dispenser unit/storage bin and clean the dispenser unit/storage bin liner using a neutral cleaner. Rinse thoroughly after cleaning.

20) Reconnect the 4 hoses connected to the water tank.

21) Replace all removed parts and panels in their correct positions.

Inlet Water Valve Tee

Front View

Wash Valve Hose

Inlet Water Valve

Wash Valve

Fig. 4

Float Switch Vent Hose

Drain Hose Tee

Drain Valve Hose

Suction Hose

Float Switch Hose

Drain Hose

Drain Valve

Bottom View

Water Tank

Fig. 5

Hoshizaki KMS2000MLH Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Important Safety Information

A. Icemaker

1. KMS-2000MLH with SRK-20H

2. KMS-2000MLH with SRK-20H3

B. Condensing Unit

1. SRK-20H

2. SRK-20H3

II. General Information

A. Construction

1. Icemaker

2. Condensing Unit

B. Sequence of Operation

1. Sequence Cycles and Shutdown

a) 1-Minute Fill Cycle

b) Initial Harvest Cycle

c) Freeze Cycle

d) Pump-Out Cycle

e) Harvest Cycle

f) Shutdown

2. Sequence Flow Chart

C. Control Board

1. Control Board Layout

2. LED Lights and Audible Alarm Safeties

3. Controls and Adjustments

a) Default Dip Switch Settings

b) Harvest Timer (S1 dip switch 1 & 2)

c) Pump-Out Timer (S1 dip switch 3 & 4)

d) Pump-Out Frequency Control (S1 dip switch 5 & 6)

e) Harvest Pump Timer (S1 dip switch 7 & 8)

f) Freeze Timer (S1 dip switch 9 & 10)

g) Pump-Out/Drain Selector (S2 dip switch 1)

h) Float Switch Selector (S2 dip switch 2)

j) Anti-Slush Program Selector (S2 dip switch 5)

k) Anti-Slush Control (S2 dip switch 6)

D. Control and Service Switches

1. Control Switch

2. Service Switch

a) DRAIN

b) CIRC.

c) WASH

III. Technical Information

A. Water Circuit and Refrigeration Circuit

B. Wiring Diagrams

1. KMS-2000MLH with SRK-20H

2. KMS-2000MLH with SRK-20H3

3. Wire Harness Connections

C. Performance Data

1. KMS-2000MLH with SRK-20H

2. KMS-2000MLH with SRK-20H3

IV. Service Diagnosis

A. Diagnostic Procedure

B. Control Board Check

C. Bin Control Check and Cleaning

1. Bin Control Check

2. Bin Control Cleaning

D. Float Switch Check and Cleaning

1. Float Switch Check

2. Float Switch Cleaning

E. Thermistor Check

F. Diagnostic Charts

1. No Ice Production

2. Freeze-Up

3. Low Ice Production

V. Replacement of Components

A. Service for Refrigerant Lines

1. Refrigerant Recovery

2. Brazing

3. Evacuation and Recharge (R-404A)

B. Important Notes for Component Replacement

VI. Cleaning and Maintenance

A. Cleaning and Sanitizing Instructions

1. Cleaning Procedure

2. Sanitizing Procedure - Following Cleaning Procedure

B. Maintenance

C. Preparing the Icemaker for Long Storage