Hoshizaki American, Inc. KM-1601SRH Service Manual

Hoshizaki America, Inc.

Stackable Crescent Cuber

Models
KM-1601SWH

“A Superior Degree

of Reliability”

www.hoshizaki.com

KM-1601SWH3
KM-1601SRH
KM-1601SRH3

SERVICE MANUAL

™

Number: 73145
Issued: 10-31-2006
Revised: 10-4-2007

IMPORTANT

Only qualified service technicians should attempt to install, service, or maintain
this 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, and warranty coverage.

HOSHIZAKI provides this manual primarily to assist qualified service technicians in the
service and maintenance of the icemaker.

Should the reader have any questions or concerns which have not been satisfactorily
addressed, please call, write, or send an e-mail message to the HOSHIZAKI Technical
Support Department for assistance.

HOSHIZAKI AMERICA, INC.

618 Highway 74 South
Peachtree City, GA 30269

Attn: HOSHIZAKI Technical Support Department

Phone: [phone] Technical Service
[phone]
Fax: [phone]
[phone]
E-mail: [e-mail]

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



IMPORTANT

This manual should be read carefully before the icemaker is serviced or
maintenance operations are performed. Only qualified 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

I. Specifications ...................................................................................................................... 5

A. Icemaker ....................................................................................................................... 5

1. KM-1601SWH (water-cooled) .................................................................................. 5

2. KM-1601SWH3 (water-cooled) ................................................................................ 6

3a. KM-1601SRH (remote air-cooled) (auxiliary codes: R-0; R-1; some S-1) ............. 7

3b. KM-1601SRH (remote air-cooled) (auxiliary codes: some S-1; S-2 and later) ...... 8

4a. KM-1601SRH3 (remote air-cooled) (auxiliary codes: R-0; R-1; some S-1) ........... 9

4b. KM-1601SRH3 (remote air-cooled) (auxiliary codes: some S-1; S-2 and later) .. 10

B. Condensing Unit .......................................................................................................... 11

1. URC-21F ............................................................................................................... 11

II. General Information ......................................................................................................... 13

A. Construction ................................................................................................................ 13

1. KM-1601SWH, KM-1601SWH3 (water-cooled) ..................................................... 13

2. KM-1601SRH, KM-1601SRH3 (remote air-cooled) ............................................... 14

B. Sequence of Operation ............................................................................................... 15

1. One Minute Fill Cycle ............................................................................................ 15

2. Initial Harvest Cycle .............................................................................................. 15

3. Freeze Cycle ......................................................................................................... 15

4. Pump-Out Cycle ................................................................................................... 15

5. Normal Harvest Cycle .......................................................................................... 15

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

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

2. Features ................................................................................................................ 19

a) Maximum Water Supply Period – 6 minutes ....................................................... 19

b) Harvest Backup Timer and Freeze Timer ........................................................... 19

c) High Temperature Safety .................................................................................... 19

d) Low Water Safety ............................................................................................... 19

e) High Voltage and Low Voltage Cut-outs ............................................................. 19

f) LED Lights and Audible Alarm Safeties ............................................................... 20

3. Controls and Adjustments ..................................................................................... 21

a) Default Dip Switch Settings ................................................................................ 21

b) Harvest Timer (dip switch 1 & 2) ........................................................................ 21

c) Pump-Out Timer (dip switch 3 & 4) ..................................................................... 22

d) Pump-Out Frequency Control (dip switch 5 & 6) ................................................ 22

e) Freeze Timer (dip switch 9 & 10) ........................................................................ 23

4. Control Board Check Procedure ............................................................................ 23

5. Control Board Replacement .................................................................................. 24

D. Harvest Control – Thermistor ...................................................................................... 24

E. Bin Control .................................................................................................................. 24



III. Technical Information ...................................................................................................... 25

A. Water Circuit and Refrigeration Circuit ........................................................................ 25

1. KM-1601SWH, KM-1601SWH3 (water-cooled) ..................................................... 25

2. KM-1601SRH, KM-1601SRH3 (remote air-cooled) ............................................... 26

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

1. KM-1601SWH (water-cooled), KM-1601SRH (remote air-cooled) ........................ 27

2. KM-1601SWH3 (water-cooled), KM-1601SRH3 (remote air-cooled) .................... 28

C. Performance Data ....................................................................................................... 29

1. KM-1601SWH (water-cooled) ................................................................................ 29

2. KM-1601SWH3 (water-cooled) .............................................................................. 30

3a. KM-1601SRH (remote air-cooled) (auxiliary codes: R-0; R-1; some S-1) ........... 31

3b. KM-1601SRH (remote air-cooled) (auxiliary codes: some S-1; S-2 and later) .... 32

4a. KM-1601SRH3 (remote air-cooled) (auxiliary codes: R-0; R-1; some S-1) ......... 33

4b. KM-1601SRH3 (remote air-cooled) (auxiliary codes: some S-1; S-2 and later) .. 34

IV. Service Diagnosis ........................................................................................................... 35

A. 10-Minute KM Diagnostic Procedure ......................................................................... 35

B. Diagnostic Charts ........................................................................................................ 36

1. No Ice Production .................................................................................................. 36

2. Evaporator is Frozen Up ........................................................................................ 40

3. Low Ice Production ................................................................................................ 41

4. Abnormal Ice ......................................................................................................... 41

5. Other ...................................................................................................................... 42

V. Removal and Replacement of Components .................................................................... 43

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

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

2. Brazing .................................................................................................................. 43

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

B. Removal and Replacement of Compressor ................................................................ 45

C. Removal and Replacement of Expansion Valve ......................................................... 46

D. Removal and Replacement of Hot Gas Valve and Line Valve ..................................... 47

E. Removal and Replacement of Evaporator .................................................................. 48

F. Removal and Replacement of Water Regulating Valve - Water Cooled Model Only.... 48

G. Adjustment of Water Regulating Valve - Water-Cooled Model Only ........................... 49

H. Removal and Replacement of Headmaster (Condensing Pressure Regulator - C.P.R.)

- Remote Air-Cooled Model Only .............................................................................. 50

I. Removal and Replacement of Thermistor .................................................................... 51

J. Removal and Replacement of Fan Motor .................................................................... 52

K. Removal and Replacement of Inlet Water Valve ......................................................... 52

L. Removal and Replacement of Pump Motor ................................................................. 53

VI. Cleaning and Maintenance ............................................................................................. 54

A. Cleaning and Sanitizing Instructions ........................................................................... 54

1. Cleaning Procedure ............................................................................................... 55

2. Sanitizing Procedure - Following Cleaning Procedure .......................................... 56

B. Maintenance ................................................................................................................ 57

C. Preparing the Icemaker for Long Storage ................................................................... 57



I. Specifications

AC SUPPLY VOLTAGE 208-230/60/1 (3 wire with neutral for 115V)
AMPERAGE 13.4 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
lbs./day ( kg/day ) 70 *1492 (677) 1501 (681) 1419 (643)
Reference without *marks 80 1499 (680) 1513 (686) 1378 (625)

90 1501 (681) *1523 (691) 1408 (639)

100 1453 (659) 1496 (679) 1303 (591)
SHAPE OF ICE Crescent Cube
ICE PRODUCTION PER CYCLE 30.2 lbs. (13.7 kg) 1440 pcs.
APPROXIMATE STORAGE CAPACITY N/A
ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F
ELECTRIC W (kWH/100 lbs.) 2410(3.8) 2300(3.7)
WATER gal./24HR (gal./100 lbs.) 373(24.5) 698(46.8)
WATER COOLED CONDENSER 1493(98) 930(62)

gal./24HR (gal./100 lbs.)
EXTERIOR DIMENSIONS (WxDxH) 48" x 27-3/8" x 27-3/8" (1219 x 695 x 695 mm)
EXTERIOR FINISH Stainless Steel, Galvanized Steel (Rear)
WEIGHT Net 310 lbs. ( 141 kg ), Shipping 360 lbs. ( 163 kg )
CONNECTIONS - ELECTRIC Permanent - Connection

- WATER SUPPLY Inlet 1/2" FPT Condenser Inlet 1/2" FPT

- DRAIN Outlet 3/4" FPT Condenser Outlet 3/8" FPT

3/8" OD Tube
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 Pressure Regulator
BIN CONTROL SYSTEM Thermostat
COMPRESSOR Hermetic, Model CS18K6E-PFV-237
CONDENSER Water-cooled, Tube in tube type
EVAPORATOR Vertical type, Stainless Steel and Copper
REFRIGERANT CONTROL Thermostatic Expansion Valve
REFRIGERANT CHARGE R-404A, 3 lbs. 1 oz. ( 1400g )
DESIGN PRESSURE High 427PSIG, Low 230PSIG
P.C. BOARD CIRCUIT PROTECTION High Voltage Cut-out ( Internal )
COMPRESSOR PROTECTION Auto-reset Overload Protector ( Internal )
REFRIGERANT CIRCUIT PROTECTION Auto-reset High Pressure Control Switch
LOW WATER PROTECTION Float Switch
ACCESSORIES -SUPPLIED N/A

-REQUIRED Ice Storage Bin
OPERATING CONDITIONS VOLTAGE RANGE 187 - 253 V

AMBIENT TEMP. 45 -100° F
WATER SUPPLY TEMP. 45 - 90° F
WATER SUPPLY PRESSURE 10 - 113 PSIG

A. Icemaker

1. KM-1601SWH (water-cooled)

Note: We reserve the right to make changes in specifications and design without prior

notice.



AC SUPPLY VOLTAGE 208-230/60/3
AMPERAGE 9.0 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
lbs./day ( kg/day ) 70 *1555 (705) 1558 (707) 1466 (665)
Reference without *marks 80 1557 (706) 1562 (708) 1417 (643)

90 1558 (707) *1565 (710) 1440 (653)

100 1507 (684) 1536 (697) 1326 (601)
SHAPE OF ICE Crescent Cube
ICE PRODUCTION PER CYCLE 30.2 lbs. (13.7 kg) 1440 pcs.
APPROXIMATE STORAGE CAPACITY N/A
ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F
ELECTRIC W (kWH/100 lbs.) 2410(3.7) 2270(3.5)
WATER gal./24HR (gal./100 lbs.) 372(23.8) 804(51.7)
WATER COOLED CONDENSER 1565(100) 910(59)

gal./24HR (gal./100 lbs.)
EXTERIOR DIMENSIONS (WxDxH) 48" x 27-3/8" x 27-3/8" (1219 x 695 x 695 mm)
EXTERIOR FINISH Stainless Steel, Galvanized Steel (Rear)
WEIGHT Net 310 lbs. ( 141 kg ), Shipping 360 lbs. ( 163 kg )
CONNECTIONS - ELECTRIC Permanent - Connection

- WATER SUPPLY Inlet 1/2" FPT Condenser Inlet 1/2" FPT

- DRAIN Outlet 3/4" FPT Condenser Outlet 3/8" FPT

3/8" OD Tube
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 Pressure Regulator
BIN CONTROL SYSTEM Thermostat
COMPRESSOR Hermetic, Model CS18K6E-TF5-237
CONDENSER Water-cooled, Tube in tube type
EVAPORATOR Vertical type, Stainless Steel and Copper
REFRIGERANT CONTROL Thermostatic Expansion Valve
REFRIGERANT CHARGE R-404A, 3 lbs. 1 oz. ( 1400g )
DESIGN PRESSURE High 427PSIG, Low 230PSIG
P.C. BOARD CIRCUIT PROTECTION High Voltage Cut-out ( Internal )
COMPRESSOR PROTECTION Auto-reset Overload Protector ( Internal )
REFRIGERANT CIRCUIT PROTECTION Auto-reset High Pressure Control Switch
LOW WATER PROTECTION Float Switch
ACCESSORIES -SUPPLIED N/A

-REQUIRED Ice Storage Bin
OPERATING CONDITIONS VOLTAGE RANGE 187 - 253 V

AMBIENT TEMP. 45 -100° F
WATER SUPPLY TEMP. 45 - 90° F
WATER SUPPLY PRESSURE 10 - 113 PSIG

2. KM-1601SWH3 (water-cooled)

Note: We reserve the right to make changes in specifications and design without prior

notice.



3a. KM-1601SRH (remote air-cooled) (auxiliary codes: R-0; R-1; some S-1)

AC SUPPLY VOLTAGE 208-230/60/1 (3 wire with neutral for 115V)
AMPERAGE 12.8 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
lbs./day ( kg/day ) 70 *1583 (718) 1550 (703) 1435 (651)
Reference without *marks 80 1558 (707) 1507 (684) 1353 (614)

90 1550 (703) *1472 (668) 1332 (604)

100 1503 (682) 1439 (653) 1203 (546)
SHAPE OF ICE Crescent Cube
ICE PRODUCTION PER CYCLE 29.4 lbs. (13.3 kg) 1440 pcs.
APPROXIMATE STORAGE CAPACITY N/A
ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F
ELECTRIC W (kWH/100 lbs.) 2640(4.3) 2440(3.7)
WATER gal./24HR (gal./100 lbs.) 255(17.3) 503(31.8)
EXTERIOR DIMENSIONS (WxDxH) 48" x 27 3/8" x 27 3/8" (1219 x 695 x 695 mm)
EXTERIOR FINISH Stainless Steel, Galvanized Steel (Rear)
WEIGHT Net 275 lbs. (125 kg), Shipping 350 lbs. (159 kg)
CONNECTIONS - ELECTRIC Permanent - Connection

- WATER SUPPLY Inlet 1/2" FPT

- DRAIN Outlet 3/4" FPT

- CONDENSATE DRAIN 3/8" OD Tube
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 Thermostat
COMPRESSOR Hermetic, Model CS18K6E-PFV
CONDENSER Air-Cooled Remote, Condenser Unit URC-21F
EVAPORATOR Vertical type, Stainless Steel and Copper
REFRIGERANT CONTROL Thermostatic Expansion Valve

Condensing Pressure Regulator on URC-21F

REFRIGERANT CHARGE R404A, 24 lb. 14.6 oz. (11300g)

(Icemaker 15 lb. 3.4 oz. Cond. Unit 9 lb. 11.2 oz.)
DESIGN PRESSURE High 467PSIG, Low 230PSIG
P.C. BOARD CIRCUIT PROTECTION High Voltage Cut-out ( Internal )
COMPRESSOR PROTECTION Auto-reset Overload Protector ( Internal )
REFRIGERANT CIRCUIT PROTECTION Auto-reset High Pressure Control Switch
LOW WATER PROTECTION Float Switch
ACCESSORIES -SUPPLIED N/A

-REQUIRED Ice Dispenser or Ice Storage Bin, Remote Condenser Unit
OPERATING CONDITIONS VOLTAGE RANGE 187 - 253 V

AMBIENT TEMP. 45 -100° F

WATER SUPPLY TEMP. 45 - 90° F

WATER SUPPLY PRESSURE 10 - 113 PSIG

This data applies to units with an 8 l/min water valve. The 8 l/min water valve is part
number 3U0111-02 and has J248-032 stamped on the side of the valve facing the
rear of the unit.

Note: We reserve the right to make changes in specifications and design without prior

notice.



3b. KM-1601SRH (remote air-cooled) (auxiliary codes: some S-1; S-2 and later)

AC SUPPLY VOLTAGE 208-230/60/1 (3 wire with neutral for 115V)
AMPERAGE 12.8 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
lbs./day ( kg/day ) 70 *1564 (709) 1547 (702) 1468 (666)
Reference without *marks 80 1551 (703) 1524 (691) 1415 (642)

90 1547 (702) *1505 (683) 1407 (638)

100 1512 (686) 1482 (672) 1317 (597)
SHAPE OF ICE Crescent Cube
ICE PRODUCTION PER CYCLE 31.2 lbs. (14.2 kg) 1440 pcs.
APPROXIMATE STORAGE CAPACITY N/A
ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F
ELECTRIC W (kWH/100 lbs.) 2700(4.3) 2610(4.0)
WATER gal./24HR (gal./100 lbs.) 375(24.9) 785(50.2)
EXTERIOR DIMENSIONS (WxDxH) 48" x 27 3/8" x 27 3/8" (1219 x 695 x 695 mm)
EXTERIOR FINISH Stainless Steel, Galvanized Steel (Rear)
WEIGHT Net 275 lbs. (125 kg), Shipping 350 lbs. (159 kg)
CONNECTIONS - ELECTRIC Permanent - Connection

- WATER SUPPLY Inlet 1/2" FPT

- DRAIN Outlet 3/4" FPT

- CONDENSATE DRAIN 3/8" OD Tube
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 Thermostat
COMPRESSOR Hermetic, Model CS18K6E-PFV
CONDENSER Air-Cooled Remote, Condenser Unit URC-21F
EVAPORATOR Vertical type, Stainless Steel and Copper
REFRIGERANT CONTROL Thermostatic Expansion Valve

Condensing Pressure Regulator on URC-21F

REFRIGERANT CHARGE R404A, 24 lb. 14.6 oz. (11300g)

(Icemaker 15 lb. 3.4 oz. Cond. Unit 9 lb. 11.2 oz.)
DESIGN PRESSURE High 467PSIG, Low 230PSIG
P.C. BOARD CIRCUIT PROTECTION High Voltage Cut-out ( Internal )
COMPRESSOR PROTECTION Auto-reset Overload Protector ( Internal )
REFRIGERANT CIRCUIT PROTECTION Auto-reset High Pressure Control Switch
LOW WATER PROTECTION Float Switch
ACCESSORIES -SUPPLIED N/A

-REQUIRED Ice Dispenser or Ice Storage Bin, Remote Condenser Unit
OPERATING CONDITIONS VOLTAGE RANGE 187 - 253 V

AMBIENT TEMP. 45 -100° F

WATER SUPPLY TEMP. 45 - 90° F

WATER SUPPLY PRESSURE 10 - 113 PSIG

This data applies to units with a 15 l/min or 11 l/min water valve. The 15 l/min water
valve is part number 3U0111-01 and has J248-030 stamped on the side of the valve
facing the rear of the unit. The 11 l/min water valve is part number 4A1176-04 and
has the part number stamped on the side of the valve facing the front of the unit.

Note: We reserve the right to make changes in specifications and design without prior

notice.



4a. KM-1601SRH3 (remote air-cooled) (auxiliary codes: R-0; R-1; some S-1)

AC SUPPLY VOLTAGE 208-230/60/3
AMPERAGE 7.9 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
lbs./day ( kg/day ) 70 *1596 (724) 1556 (706) 1436 (651)
Reference without *marks 80 1565 (710) 1503 (682) 1347 (611)

90 1556 (706) *1459 (662) 1316 (597)

100 1510 (685) 1426 (647) 1184 (537)
SHAPE OF ICE Crescent Cube
ICE PRODUCTION PER CYCLE 29.4 lbs. (13.3 kg) 1440 pcs.
APPROXIMATE STORAGE CAPACITY N/A
ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F
ELECTRIC W (kWH/100 lbs.) 2580(4.3) 2450(3.7)
WATER gal./24HR (gal./100 lbs.) 261(17.9) 504(31.6)
EXTERIOR DIMENSIONS (WxDxH) 48" x 27 3/8" x 27 3/8" (1219 x 695 x 695 mm)
EXTERIOR FINISH Stainless Steel, Galvanized Steel (Rear)
WEIGHT Net 275 lbs. (125 kg), Shipping 350 lbs. (159 kg)
CONNECTIONS - ELECTRIC Permanent - Connection

- WATER SUPPLY Inlet 1/2" FPT

- DRAIN Outlet 3/4" FPT

- CONDENSATE DRAIN 3/8" OD Tube
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 Thermostat
COMPRESSOR Hermetic, Model CS18K6E-TF5
CONDENSER Air-Cooled Remote, Condenser Unit URC-21F
EVAPORATOR Vertical type, Stainless Steel and Copper
REFRIGERANT CONTROL Thermostatic Expansion Valve

Condensing Pressure Regulator on URC-21F

REFRIGERANT CHARGE R404A, 24 lb. 14.6 oz. (11300g)

(Icemaker 15 lb. 3.4 oz. Cond. Unit 9 lb. 11.2 oz.)
DESIGN PRESSURE High 467PSIG, Low 230PSIG
P.C. BOARD CIRCUIT PROTECTION High Voltage Cut-out ( Internal )
COMPRESSOR PROTECTION Auto-reset Overload Protector ( Internal )
REFRIGERANT CIRCUIT PROTECTION Auto-reset High Pressure Control Switch
LOW WATER PROTECTION Float Switch
ACCESSORIES -SUPPLIED N/A

-REQUIRED Ice Dispenser or Ice Storage Bin, Remote Condenser Unit
OPERATING CONDITIONS VOLTAGE RANGE 187 - 253 V

AMBIENT TEMP. 45 -100° F

WATER SUPPLY TEMP. 45 - 90° F

WATER SUPPLY PRESSURE 10 - 113 PSIG

This data applies to units with an 8 l/min water valve. The 8 l/min water valve is part
number 3U0111-02 and has J248-032 stamped on the side of the valve facing the
rear of the unit.

Note: We reserve the right to make changes in specifications and design without prior

notice.



4b. KM-1601SRH3 (remote air-cooled) (auxiliary codes: some S-1; S-2 and later)

AC SUPPLY VOLTAGE 208-230/60/3
AMPERAGE 7.9 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
lbs./day ( kg/day ) 70 *1585 (719) 1563 (709) 1464 (664)
Reference without *marks 80 1568 (711) 1535 (696) 1396 (633)

90 1563 (709) *1511 (685) 1387 (629)

100 1520 (689) 1482 (672) 1273 (577)
SHAPE OF ICE Crescent Cube
ICE PRODUCTION PER CYCLE 31.2 lbs. (14.2 kg) 1440 pcs.
APPROXIMATE STORAGE CAPACITY N/A
ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F
ELECTRIC W (kWH/100 lbs.) 2960(4.7) 2580(3.9)
WATER gal./24HR (gal./100 lbs.) 363(24.0) 781(49.3)
EXTERIOR DIMENSIONS (WxDxH) 48" x 27 3/8" x 27 3/8" (1219 x 695 x 695 mm)
EXTERIOR FINISH Stainless Steel, Galvanized Steel (Rear)
WEIGHT Net 275 lbs. (125 kg), Shipping 350 lbs. (159 kg)
CONNECTIONS - ELECTRIC Permanent - Connection

- WATER SUPPLY Inlet 1/2" FPT

- DRAIN Outlet 3/4" FPT

- CONDENSATE DRAIN 3/8" OD Tube
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 Thermostat
COMPRESSOR Hermetic, Model CS18K6E-TF5
CONDENSER Air-Cooled Remote, Condenser Unit URC-21F
EVAPORATOR Vertical type, Stainless Steel and Copper
REFRIGERANT CONTROL Thermostatic Expansion Valve

Condensing Pressure Regulator on URC-21F

REFRIGERANT CHARGE R404A, 24 lb. 14.6 oz. (11300g)

(Icemaker 15 lb. 3.4 oz. Cond. Unit 9 lb. 11.2 oz.)
DESIGN PRESSURE High 467PSIG, Low 230PSIG
P.C. BOARD CIRCUIT PROTECTION High Voltage Cut-out ( Internal )
COMPRESSOR PROTECTION Auto-reset Overload Protector ( Internal )
REFRIGERANT CIRCUIT PROTECTION Auto-reset High Pressure Control Switch
LOW WATER PROTECTION Float Switch
ACCESSORIES -SUPPLIED N/A

-REQUIRED Ice Dispenser or Ice Storage Bin, Remote Condenser Unit
OPERATING CONDITIONS VOLTAGE RANGE 187 - 253 V

AMBIENT TEMP. 45 -100° F

WATER SUPPLY TEMP. 45 - 90° F

WATER SUPPLY PRESSURE 10 - 113 PSIG

This data applies to units with a 15 l/min or 11 l/min water valve. The 15 l/min water
valve is part number 3U0111-01 and has J248-030 stamped on the side of the valve
facing the rear of the unit. The 11 l/min water valve is part number 4A1176-04 and
has the part number stamped on the side of the valve facing the front of the unit.

Note: We reserve the right to make changes in specifications and design without prior

notice.

10

B. Condensing Unit

1. URC-21F

Unit: mm (inches)

11

MODEL: URC-21F

AC SUPPLY VOLTAGE 115/60/1 (Connection to Icemaker)

FAN MOTOR 115 V Total 2.6FLA 130W

EXTERIOR DIMENSIONS (WxDxH) 46-3/8" x 15-11/16" x 25-15/16" (1178 x 398 x 659 mm)

DIMENSIONS INCLUDING LEGS (WxDxH) 48-7/16" x 18-1/8" x 40-7/8" (1230 x 460 x 1039 mm)

EXTERIOR FINISH Galvanized Steel

WEIGHT Net 158 lbs. ( 72 kg ) Shipping 169 lbs. ( 77 kg )

CONNECTIONS - ELECTRIC Permanent - Connection

- REFRIGERANT Discharge Line 1-1/16"-12 UNF Fitting (#10 AEROQUIP)

Liquid Line 5/8"-18 UNF Fitting (#6 AEROQUIP)

CONDENSER Air-cooled, Fin and tube type

FAN MOTOR PROTECTION Thermal Protection

REFRIGERANT CONTROL Condensing Pressure Regulator

REFRIGERANT CHARGE R-404A 9 lb. 11oz. (4400g)

DESIGN PRESSURE High 467 PSIG 32.2 Bar

OPERATING CONDITIONS VOLTAGE RANGE 104 ~ 127 V

AMBIENT TEMP. -20 ~ 122 °F

ACCESSORIES -SUPPLIED Leg 2 pcs

Hex. Head Bolt w/Washer 8 x 16 8 pcs

Hex. Nut 8 8 pcs

SPECIFICATIONS

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II. General Information

A. Construction

1. KM-1601SWH, KM-1601SWH3 (water-cooled)

Spray Tubes

Inlet Water
Valve

Expansion Valves

Evaporator Assembly

Cleaning Valve

Check Valve
(water)

Water Pump

Float Switch

Compressor

Water Supply Inlet

Junction Box

Hot Gas Valve

Check Valves

Water Regulator

Water-cooled
Condenser

Control Box

Bin Control Thermostat

Control Switch

Transformer Box
(KM-1601SWH3)

Capacitor Box
(KM-1601SWH)

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Drier

Liquid Line Valve

2. KM-1601SRH, KM-1601SRH3 (remote air-cooled)

Spray Tubes

Evaporator Assembly

Cleaning Valve

Check Valve
(water)

Water Pump

Float Switch

Compressor

Inlet Water
Valve

Expansion Valves

Water Supply Inlet

Hot Gas Valve

Junction Boxes

Check Valves

Receiver Tank

Bin Control Thermostat

Control Switch

Transformer Box
(KM-1601SRH3)

Capacitor Box
(KM-1601SRH)

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Control Box

Drier

Liquid Line Valve

B. Sequence of Operation

The steps in the sequence are as outlined below. When power is supplied, a 5 second
delay occurs at startup. Note that the order of the LEDs from the outer edge of the board is
1, 4, 3, 2.

1. One Minute Fill Cycle

LED 4 is on. WV opens and the fill period begins. After 1 minute, the board checks for
a closed F/S. If F/S is closed, the harvest cycle begins. If not, WV will remain energized
through additional 1 minute cycles until water enters the sump and F/S closes. This serves
as a low water safety to protect the water pump.

2. Initial Harvest Cycle

LEDs 1, 4, and 2 are on. WV remains open, Comp and FMR energize, HGV opens,
and harvest begins. As the evaporator warms, the thermistor located on the suction line
checks for a 48°F (9°C) temperature. When 48°F (9°C) is reached, a 3.9 kΩ signal turns
the harvest over to the adjustable harvest timer which is factory set for normal conditions.
The timer has settings of 60, 90, 120, and 180 seconds (dip switch 1 & 2). The water valve
is open during harvest for a maximum of 6 minutes or the length of harvest, whichever is
shorter. When the harvest timer completes its count down, the harvest cycle is complete
and the freeze cycle starts. The minimum total time allowed by the board for a complete
harvest cycle is 2 minutes.

3. Freeze Cycle

LED 1 is on. Comp and FMR continue to run, PM and FMS energize, LLV opens, HGV
and WV close, and the freeze cycle starts. For the first 5 minutes the control board will not
accept a signal from F/S. This 5 minute minimum freeze acts as a short cycle protection. At
the end of 5 minutes, F/S assumes control. As ice builds on the evaporator the water level
in the sump lowers. The freeze continues until F/S opens and terminates ice production.

4. Pump-Out Cycle

LEDs 1, 3, and 2 are on. Comp and FMR continue to run, HGV opens, LLV closes, and
FMS deenergizes. PM stops for 2 seconds and reverses, taking water from the bottom of
the sump and forcing pressure against the check valve seat allowing water to go through
the check valve and down the drain. At the same time water flows through the small tube
to power flush the F/S. When the pump-out timer stops counting, the pump out is complete.
Pump out always occurs on the 2nd harvest after startup. Then, depending on the control
board setting, pump out occurs every cycle, or every 2nd, 5th, or 10th cycle (dip switch 5 &

6).

5. Normal Harvest Cycle

LEDs 1, 4, and 2 are on. Comp and FMR continue to run, HGV remains open, and WV
opens. As the evaporator warms, the thermistor reaches 48°F (9°C). The control board
then receives the thermistor's 3.9 kΩ signal and starts the harvest timer. The water valve
is open during harvest for a maximum of 6 minutes or the length of harvest, whichever is
shorter. When the harvest timer completes its count down, the harvest cycle is complete
and the next freeze cycle starts. The unit continues to cycle through 3, 4, and 5 sequence
until the bin control senses ice and shuts the unit down.

Legend: Comp–compressor; FMR–remote fan motor; FMS–self-contained fan motor;

F/S–float switch; HGV–hot gas valve; LLV–Liquid Line Valve; PM–pump motor;
WV–inlet water valve

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Cycle

4. Pump-Out

F/S in

control

5 minute timer

in control

• Minimum freeze time: 5 minutes

• Maximum freeze time: freeze timer setting

Pump motor stops

for 2 sec. and then

reverses for 10/20 sec.

Freeze cycle

operation turned

over to F/S

F/S closed

FMR continues

HGV de-energized

Comp continues

F/S Check

each 1, 2, 5, or 10 cycles.

WV de-energized

Comp continues

PM energized

FMR continues

HGV energized

FMS energized

F/S open

FMS de-energized

1 to 3 minute timer

in control

Thermistor temp

reaches 48°F (9°C)

2. Harvest Cycle 3. Freeze Cycle

Thermistor in

• Maximum harvest time: 20 minutes

Fill Cycle

control

F/S closed

F/S Check

Comp energized

WV Energized

HGV energized

• Maximum inlet water valve time: 6 minutes

1. One Minute

KM-1601SWH/3, KM-1601SRH/3 Sequence Flow Chart and Component Operation

Cycle Steps

"E" board will have

Initial startup always

5 second delay

begins here

Harvest timer starts

(3.9 kΩ or less)

FMR energized

WV continues

F/S open

If F/S is open, compressor stops and cycle returns to 1 minute fill

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

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

"WASH" position, power is supplied to the pump motor. With the cleaning valve closed, the cleaner and

sanitizer flow over the outside of the evaporator plate assembly. With the cleaning valve open, the cleaner

and sanitizer flow over both the outside and the inside of the evaporator plate assembly.

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

Legend:

Comp - compressor

FMR - remote fan motor

FMS - self-contained fan motor

F/S - float switch

HGV - hot gas valve

PM - pump motor

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

WV - inlet water valve

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C. Control Board

• A HOSHIZAKI exclusive solid-state control is employed in KM-1601SWH,
KM-1601SWH3, KM-1601SRH, and KM-1601SRH3 Stackable Crescent Cubers.

• All models are pretested and factory-adjusted.

CAUTION

1. Fragile, handle very carefully.

2. A 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 board.

3. Do not touch the electronic devices on the board or the back of the board to
prevent damage to the board.

4. Do not change wiring and connections. Do not misconnect K3, K4, and K5,
because the same connector is used for the thermistor and float switch. K4 is
not connected.

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

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

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1. Control Board Layout

Control Products "E" Control Board

Alarm Reset Switch

Backup Freeze
Timer LED

Backup Harvest
Timer LED

Alarm Buzzer

Dip Switch

Output Test Switch
(used to test relays on board)

Connector K3
Harvest Control
(thermistor)

Connector K4
Open
(not connected)

Power LED
(lights when
power is supplied
to the board)

Relay LEDs (4)
(indicate which
relays are energized
as listed below)

LED 2
Hot Gas Valve (HGV)
Self-Contained Fan
Motor (FMS) (FMS
off when LED on)

LED 3
Pump Motor (PM)
(on at pump out only)

LED 4
Water Valve (WV)

LED 1
Compressor (Comp)
Remote Fan Motor
(FMR)

Transformer
Connector

Microprocessor
(board revision level
indicated by last 2
digits on label)

Connector K5
Float Switch

Part Number

Connector K1

Pins #1 through #10
#1, 9 Magnetic Contactor
#2 Hot Gas Valve
#3 Line Valve
Self-Contained Fan Motor (FMS)
#4 Pump Motor (icemaking)
#5 Pump Motor (drain)
#6 Water Valve
#7, 10 Power (line, bin control)
#8 Open

Switch for "C" board
and "ALPINE" board
(service boards only)

Control Board

Part Number 2A1410-01 (factory); 2A1410-02 (service)

Type HOS-001A (Control Products - 10 Pin)

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