Hoshizaki KMS2000MLH Service Manual

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

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: [phone]
Fax: [phone]

E-mail: [e-mail]

HOSHIZAKI AMERICA, INC.
618 Highway 74 South
Peachtree City, GA 30269
Attn: Hoshizaki Technical Support Department

Web Site: www.hoshizaki.com

NOTE: To expedite assistance, all correspondence/communication MUST include the

following information:

• Model Number ________________________

• Serial Number ________________________

• Complete and detailed explanation of the problem.

2

IMPORTANT

This manual should be read carefully before the icemaker is serviced 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

3

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

4

Important Safety Information

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

5

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.

6

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.

7

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.

8

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.

9

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.

10

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

11

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)

12

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.

13

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.

14

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

15

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

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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.

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