Hoshizaki KM-901MWH User Manual

Hoshizaki America, Inc.

Hoshizaki

Modular Crescent Cuber

Models
KM-901MAH

“A Superior Degree

of Reliability”

www.hoshizaki.com

KM-901MWH
KM-901MRH/3

SERVICE MANUAL

™

Number: 73156
Issued: 4-18-2008

1

Revised: 6-23-2009

IMPORTANT

Only qualied service technicians should install, service, and maintain the
icemaker. No service or maintenance should be undertaken until the technician
has thoroughly read this Service Manual. Failure to service and
maintain the equipment in accordance with this manual may adversely affect
safety, performance, component life, and warranty coverage.

Hoshizaki provides this manual primarily to assist qualied service technicians in the
service and maintenance of the icemaker.

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

HOSHIZAKI AMERICA, INC.
618 Highway 74 South
Peachtree City, GA 30269

Attn: Hoshizaki Technical Support Department

Phone: [phone] Technical Support
[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. 

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 ................................................................................................. 6

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

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

1a. KM-901MAH (air-cooled) Auxiliary Code T-0, U-0 .................................................. 7

1b. KM-901MAH (air-cooled) Auxiliary Code U-1 and Later ........................................ 8

2a. KM-901MWH (water-cooled) Auxiliary Code T-0, U-0 ............................................ 9

2b. KM-901MWH (water-cooled) Auxiliary Code U-1 and Later ................................. 10

3a. KM-901MRH (remote air-cooled) Auxiliary Code T-0, U-0 ....................................11

3b. KM-901MRH (remote air-cooled) Auxiliary Code U-1 and Later .......................... 12

4a. KM-901MRH3 (remote air-cooled) Auxiliary Code T-0, U-0 ................................. 13

4b. KM-901MRH (remote air-cooled) Auxiliary Code U-1 and Later .......................... 14

B. Condenser Unit ........................................................................................................... 15

1. URC-9F .................................................................................................................. 15

II. General Information ......................................................................................................... 17

A. Construction ................................................................................................................ 17

1. KM-901MAH (air-cooled) ........................................................................................ 17

2. KM-901MWH (water-cooled) ................................................................................. 18

3. KM-901MRH/3 (remote air-cooled) ........................................................................ 19

B. Sequence of Operation ............................................................................................... 20

1. Sequence Cycles and Shutdown ........................................................................... 20

a) "E" Control Board: Auxiliary Code T-0, U-0 ...................................................... 20

b) "G" Control Board: Auxiliary Code U-1 and Later ............................................. 21

2. Sequence Flow Chart ............................................................................................ 24

a) "E" Control Board: Auxiliary Code T-0, U-0 ....................................................... 24

b) "G" Control Board: Auxiliary Code U-1 and Later ............................................. 25

C. Control Board .............................................................................................................. 26

1. Control Board Layout ............................................................................................. 27

2. Features ................................................................................................................. 29

a) Maximum Water Supply Period - 6 minutes ..................................................... 29

b) Harvest Backup Timer and Freeze Timer ......................................................... 29

c) High Temperature Safety .................................................................................. 29

d) Low Water Safety ............................................................................................. 29

e) High Voltage and Low Voltage Cut-outs ........................................................... 29

f) LED Lights and Audible Alarm Safeties ............................................................ 30

3

3. Controls and Adjustments ...................................................................................... 32

a) Default Dip Switch Settings .............................................................................. 32

b) Harvest Timer (S4 dip switch 1 & 2) ................................................................. 32

c) Pump-Out Timer (S4 dip switch 3 & 4) ............................................................. 33

d) Pump-Out Frequency Control (S4 dip switch 5 & 6)......................................... 33

e) Bin Control Selector/Harvest Pump Timer (S4 dip switch 7) ............................ 34

f) Factory Use (S4 dip switch 8) ........................................................................... 34

g) Freeze Timer (S4 dip switch 9 & 10) ................................................................ 35

h) Float Switch Control (S5 dip switch 1): "G" Control Board .............................. 35

i) Rell Counter (S5 dip switch 2 through 5): "G" Control Board ........................... 35

D. Bin Control .................................................................................................................. 36

1. Thermostatic Bin Control: Auxiliary Code T-0, U-0 ................................................. 36

2. Mechanical Bin Control: Auxiliary Code U-1 and Later .......................................... 36

E. Float Switch ................................................................................................................. 36

F. Thermistor .................................................................................................................... 36

G. Control Switch ............................................................................................................. 36

III. Technical Information ...................................................................................................... 37

A. Water Circuit and Refrigeration Circuit ........................................................................ 37

1. KM-901MAH (air-cooled) ........................................................................................ 37

2. KM-901MWH (water-cooled) ................................................................................. 38

3. KM-901MRH/3 (remote air-cooled) ........................................................................ 39

B. Wiring Diagrams .......................................................................................................... 40

1. Thermostatic Bin Control: Auxiliary Code T-0, U-0 ................................................. 40

a) KM-901MAH (air-cooled) and KM-901MWH (water-cooled) ............................. 40

b) KM-901MRH (remote air-cooled) ..................................................................... 41

c) KM-901MRH3 (remote air-cooled) .................................................................... 42

2. Mechanical Bin Control: Auxiliary Code U-1 and Later .......................................... 43

a) KM-901MAH (air-cooled) and KM-901MWH (water-cooled) ............................. 43

b) KM-901MRH (remote air-cooled) ..................................................................... 44

c) KM-901MRH3 (remote air-cooled) .................................................................... 45

C. Performance Data ....................................................................................................... 46

1. KM-901MAH (air-cooled) ........................................................................................ 46

2. KM-901MWH (water-cooled) ................................................................................. 47

3. KM-901MRH (remote air-cooled) ........................................................................... 48

4. KM-901MRH3 (remote air-cooled) ......................................................................... 49

IV. Service Diagnosis ........................................................................................................... 50

A. Diagnostic Procedure .................................................................................................. 50

B. Control Board Check ................................................................................................... 53

C. Bin Control Check ....................................................................................................... 54

1. Thermostatic Bin Control Check: Auxiliary Code T-0, U-0 ...................................... 54

2. Mechanical Bin Control Check and Cleaning: Auxiliary Code U-1 and Later ......... 55

a) Mechanical Bin Control Check ......................................................................... 55

b) Mechanical Bin Control Cleaning ..................................................................... 56

D. Float Switch Check and Cleaning ............................................................................... 57

1. Float Switch Check ................................................................................................ 57

2. Float Switch Cleaning ............................................................................................ 58

E. Thermistor Check ........................................................................................................ 59

F. Diagnostic Charts ........................................................................................................ 60

4

V. Removal and Replacement of Components .................................................................... 68

A. Service for Refrigerant Lines ....................................................................................... 68

1. Refrigerant Recovery ............................................................................................. 68

2. Brazing .................................................................................................................. 69

3. Evacuation and Recharge (R-404A) ...................................................................... 69

B. Removal and Replacement of Compressor ................................................................. 70

C. Removal and Replacement of Expansion Valve .......................................................... 71

D. Removal and Replacement of Hot Gas Valve or Liquid Line Valve ............................. 72

E. Removal and Replacement of Evaporator ................................................................... 73

F. Removal and Replacement of Air-Cooled Condenser ...................................................74

G. Removal and Replacement of Water-Cooled Condenser ............................................ 75

H. Removal and Replacement of Remote Air-Cooled Condenser ................................... 76

I. Removal and Replacement of Water Regulating Valve (water-cooled model) .............. 77

J. Adjustment of Water Regulating Valve (water-cooled model) ....................................... 78

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

(remote air-cooled model) ......................................................................................... 78

L. Removal and Replacement of Thermistor ................................................................... 79

M. Removal and Replacement of Fan Motor (air-cooled and remote air-cooled models) 80

N. Removal and Replacement of Inlet Water Valve ......................................................... 80

O. Removal and Replacement of Pump Motor ................................................................ 81

P. Removal and Replacement of Control Board ............................................................... 82

VI. Cleaning and Maintenance ............................................................................................. 83

A. Cleaning and Sanitizing Instructions ........................................................................... 83

1. Cleaning Procedure ................................................................................................ 84

2. Sanitizing Procedure - Following Cleaning Procedure ........................................... 85

B. Maintenance ............................................................................................................... 86

C. Preparing the Icemaker for Long Storage ................................................................... 86

5

Important Safety Information

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

WARNING Indicates a hazardous situation which could result in death or

serious injury.

CAUTION Indicates a situation which could result in damage to the unit.

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
eventual damage caused by improper, incorrect, and unreasonable use.

To reduce the risk of death, electric shock, serious injury, or re, follow
basic precautions including the following:

•Electricalconnectionmustbehard-wiredandmustmeetnational,state,and

local electrical code requirements. Failure to meet these code requirements
could result in death, electric shock, serious injury, re, or severe damage to
equipment.

•Thisunitrequiresanindependentpowersupply.Seethenameplatefor

proper voltage and breaker/fuse size. Failure to use a proper breaker or fuse
can result in a tripped breaker, blown fuse, or damage to existing wiring. This
could lead to heat generation or re.

•THIS UNIT MUST BE GROUNDED. Failure to properly ground this unit could
result in death or serious injury.

•Thisunitshouldbedisassembledorrepairedonlybyqualiedservice

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

•Donotmakeanyalterationstotheunit.Alterationscouldresultinelectric

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

6

I. Specications

A. Icemaker

1a. KM-901MAH (air-cooled) Auxiliary Code T-0, U-0

AC SUPPLY VOLTAGE 208-230/60/1 (3 wire with netrual for 115V)
AMPERAGE 11.4 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 *874 (396) 832 (378) 785 (356)
Reference without *marks 80 842 (382) 778 (353) 736 (334)

90 832 (378) *732 (332) 687 (312)

100 826 (375) 721 (327) 646 (293)
SHAPE OF ICE Crescent Cube
ICE PRODUCTION PER CYCLE 13.6 lbs. (6.2 kg) 720pcs.
APPROXIMATE STORAGE CAPACITY N/A
ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F
ELECTRIC W (kWH/100 lbs.) 1710(5.6) 1600(4.4)
WATER gal./24HR (gal./100 lbs.) 143(19.6) 240(27.5)
EXTERIOR DIMENSIONS (WxDxH) 30" x 27-3/8" x 37-7/16" (762 x 695 x 950 mm)
EXTERIOR FINISH Stainless Steel, Galvanized Steel (Rear)
WEIGHT Net 196 lbs. (89 kg), Shipping 256 lbs. (116 kg)
CONNECTIONS - ELECTRIC Permanent - Connection

- WATER SUPPLY Inlet 1/2" FPT

- DRAIN Outlet 3/4" 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 N/A
BIN CONTROL SYSTEM Thermostat
COMPRESSOR Hermetic, Model CS12K6E-PFV-237
CONDENSER Air-Cooled , Fin and tube type
EVAPORATOR Vertical type, Stainless Steel and Copper
REFRIGERANT CONTROL Thermostatic Expansion Valve
REFRIGERANT CHARGE R404A, 2 lb. 15 oz. (1320g)
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 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

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

notice.

7

1b. KM-901MAH (air-cooled) Auxiliary Code U-1 and Later

AC SUPPLY VOLTAGE 208-230/60/1 (3 wire with netrual for 115V)
AMPERAGE 11.4 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 *874 (396) 832 (378) 785 (356)
Reference without *marks 80 842 (382) 778 (353) 736 (334)

90 832 (378) *732 (332) 687 (312)

100 826 (375) 721 (327) 646 (293)
SHAPE OF ICE Crescent Cube
ICE PRODUCTION PER CYCLE 13.6 lbs. (6.2 kg) 720pcs.
APPROXIMATE STORAGE CAPACITY N/A
ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F
ELECTRIC W (kWH/100 lbs.) 1710(5.6) 1600(4.4)
WATER gal./24HR (gal./100 lbs.) 143(19.6) 240(27.5)
EXTERIOR DIMENSIONS (WxDxH) 30" x 27-3/8" x 37-7/16" (762 x 695 x 950 mm)
EXTERIOR FINISH Stainless Steel, Galvanized Steel (Rear)
WEIGHT Net 196 lbs. (89 kg), Shipping 256 lbs. (116 kg)
CONNECTIONS - ELECTRIC Permanent - Connection

- WATER SUPPLY Inlet 1/2" FPT

- DRAIN Outlet 3/4" 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 N/A
BIN CONTROL SYSTEM Mechanical Switch
COMPRESSOR Hermetic, Model CS12K6E-PFV-237
CONDENSER Air-Cooled , Fin and tube type
EVAPORATOR Vertical type, Stainless Steel and Copper
REFRIGERANT CONTROL Thermostatic Expansion Valve
REFRIGERANT CHARGE R404A, 2 lb. 15 oz. (1320g)
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 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

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

notice.

8

2a. KM-901MWH (water-cooled) Auxiliary Code T-0, U-0

AC SUPPLY VOLTAGE 208-230/60/1 (3 wire with netrual for 115V)
AMPERAGE 8.7A ( 5 Min. Freeze AT 104°F / WT 80°F)
MINIMUM CIRCUIT AMPACITY 15 A
MAXIMUM FUSE SIZE 15 A
APPROXIMATE ICE PRODUCTION Ambient WATER TEMP. (°F)
PER 24 HR. Temp.(°F) 50 70 90
lbs./day ( kg/day ) 70 *912 (414) 889 (403) 849 (385)
Reference without *marks 80 895 (406) 860 (390) 815 (370)

90 889 (403) *835 (379) 791 (359)

100 878 (398) 825 (374) 751 (341)
SHAPE OF ICE Crescent Cube
ICE PRODUCTION PER CYCLE 13.4 lbs. (6.1 kg) 720pcs.
APPROXIMATE STORAGE CAPACITY N/A
ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F
ELECTRIC W (kWH/100 lbs.) 1570(4.5) 1480(3.9)
WATER gal./24HR (gal./100 lbs.) 182(21.8) 245(26.9)
WATER COOLED CONDENSER 1162(139) 631(69)

gal./24HR (gal./100 lbs.)
EXTERIOR DIMENSIONS (WxDxH) 30" x 27-3/8" x 37-7/16" (762 x 695 x 950 mm)
EXTERIOR FINISH Stainless Steel, Galvanized Steel (Rear)
WEIGHT Net 189 lbs. (86 kg), Shipping 249 lbs. (113 kg)
CONNECTIONS - ELECTRIC Permanent - Connection

- WATER SUPPLY Inlet 1/2" FPT Cond. Inlet 1/2" FPT

- DRAIN Outlet 3/4" FPT Cond. 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 CS12K6E-PFV-237
CONDENSER Water-cooled, Tube in tube type
EVAPORATOR Vertical type, Stainless Steel and Copper
REFRIGERANT CONTROL Thermostatic Expansion Valve
REFRIGERANT CHARGE R404A, 1 lb. 15.4 oz. (890g)
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

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

notice.

9

2b. KM-901MWH (water-cooled) Auxiliary Code U-1 and Later

AC SUPPLY VOLTAGE 208-230/60/1 (3 wire with netrual for 115V)
AMPERAGE 8.7A ( 5 Min. Freeze AT 104°F / WT 80°F)
MINIMUM CIRCUIT AMPACITY 15 A
MAXIMUM FUSE SIZE 15 A
APPROXIMATE ICE PRODUCTION Ambient WATER TEMP. (°F)
PER 24 HR. Temp.(°F) 50 70 90
lbs./day ( kg/day ) 70 *912 (414) 889 (403) 849 (385)
Reference without *marks 80 895 (406) 860 (390) 815 (370)

90 889 (403) *835 (379) 791 (359)

100 878 (398) 825 (374) 751 (341)
SHAPE OF ICE Crescent Cube
ICE PRODUCTION PER CYCLE 13.4 lbs. (6.1 kg) 720pcs.
APPROXIMATE STORAGE CAPACITY N/A
ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F
ELECTRIC W (kWH/100 lbs.) 1570(4.5) 1480(3.9)
WATER gal./24HR (gal./100 lbs.) 182(21.8) 245(26.9)
WATER COOLED CONDENSER 1162(139) 631(69)

gal./24HR (gal./100 lbs.)
EXTERIOR DIMENSIONS (WxDxH) 30" x 27-3/8" x 37-7/16" (762 x 695 x 950 mm)
EXTERIOR FINISH Stainless Steel, Galvanized Steel (Rear)
WEIGHT Net 189 lbs. (86 kg), Shipping 249 lbs. (113 kg)
CONNECTIONS - ELECTRIC Permanent - Connection

- WATER SUPPLY Inlet 1/2" FPT Cond. Inlet 1/2" FPT

- DRAIN Outlet 3/4" FPT Cond. 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 Mechanical Switch
COMPRESSOR Hermetic, Model CS12K6E-PFV-237
CONDENSER Water-cooled, Tube in tube type
EVAPORATOR Vertical type, Stainless Steel and Copper
REFRIGERANT CONTROL Thermostatic Expansion Valve
REFRIGERANT CHARGE R404A, 1 lb. 15.4 oz. (890g)
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

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

notice.

10

3a. KM-901MRH (remote air-cooled) Auxiliary Code T-0, U-0

AC SUPPLY VOLTAGE 208-230/60/1 (3 wire with netrual for 115V)
AMPERAGE 11.6A ( 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 *889 (403) 859 (389) 803 (364)
Reference without *marks 80 866 (393) 818 (371) 755 (343)

90 859 (389) *785 (356) 724 (328)

100 843 (382) 771 (350) 668 (303)
SHAPE OF ICE Crescent Cube
ICE PRODUCTION PER CYCLE 13.5 lbs. (6.1 kg) 720pcs.
APPROXIMATE STORAGE CAPACITY N/A
ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F
ELECTRIC W (kWH/100 lbs.) 1770(5.4) 1590(4.3)
WATER gal./24HR (gal./100 lbs.) 152(19.3) 246(27.7)
EXTERIOR DIMENSIONS (WxDxH) 30" x 27-3/8" x 37-7/16" (762 x 695 x 950 mm)
EXTERIOR FINISH Stainless Steel, Galvanized Steel (Rear)
WEIGHT Net 189 lbs. (86 kg), Shipping 249 lbs. (113 kg)
CONNECTIONS - ELECTRIC Permanent - Connection

- WATER SUPPLY Inlet 1/2" FPT

- DRAIN Outlet 3/4" 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 N/A
BIN CONTROL SYSTEM Thermostat
COMPRESSOR Hermetic, Model CS12K6E-PFV-279
CONDENSER Air-Cooled Remote, Condenser Unit URC-9F
EVAPORATOR Vertical type, Stainless Steel and Copper
REFRIGERANT CONTROL Thermostatic Expansion Valve

Condensing Pressure Regulator on URC-9F

REFRIGERANT CHARGE R404A, 9 lbs. 4 oz. (4200g)

(Icemaker 5 lbs. 5 oz. Cond. Unit 3 lbs. 15 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 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

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

notice.

11

3b. KM-901MRH (remote air-cooled) Auxiliary Code U-1 and Later

AC SUPPLY VOLTAGE 208-230/60/1 (3 wire with netrual for 115V)
AMPERAGE 11.6A ( 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 *889 (403) 859 (389) 803 (364)
Reference without *marks 80 866 (393) 818 (371) 755 (343)

90 859 (389) *785 (356) 724 (328)

100 843 (382) 771 (350) 668 (303)
SHAPE OF ICE Crescent Cube
ICE PRODUCTION PER CYCLE 13.5 lbs. (6.1 kg) 720pcs.
APPROXIMATE STORAGE CAPACITY N/A
ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F
ELECTRIC W (kWH/100 lbs.) 1770(5.4) 1590(4.3)
WATER gal./24HR (gal./100 lbs.) 152(19.3) 246(27.7)
EXTERIOR DIMENSIONS (WxDxH) 30" x 27-3/8" x 37-7/16" (762 x 695 x 950 mm)
EXTERIOR FINISH Stainless Steel, Galvanized Steel (Rear)
WEIGHT Net 189 lbs. (86 kg), Shipping 249 lbs. (113 kg)
CONNECTIONS - ELECTRIC Permanent - Connection

- WATER SUPPLY Inlet 1/2" FPT

- DRAIN Outlet 3/4" 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 N/A
BIN CONTROL SYSTEM Mechanical Switch
COMPRESSOR Hermetic, Model CS12K6E-PFV-279
CONDENSER Air-Cooled Remote, Condenser Unit URC-9F
EVAPORATOR Vertical type, Stainless Steel and Copper
REFRIGERANT CONTROL Thermostatic Expansion Valve

Condensing Pressure Regulator on URC-9F

REFRIGERANT CHARGE R404A, 9 lbs. 4 oz. (4200g)

(Icemaker 5 lbs. 5 oz. Cond. Unit 3 lbs. 15 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 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

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

notice.

12

4a. KM-901MRH3 (remote air-cooled) Auxiliary Code T-0, U-0

AC SUPPLY VOLTAGE 208-230/60/3
AMPERAGE 7.0A ( 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 *899 (408) 874 (397) 817 (371)
Reference without *marks 80 880 (399) 842 (382) 772 (350)

90 874 (397) *815 (370) 749 (340)

100 855 (388) 800 (363) 689 (313)
SHAPE OF ICE Crescent Cube
ICE PRODUCTION PER CYCLE 14.2 lbs. (6.4 kg) 720pcs.
APPROXIMATE STORAGE CAPACITY N/A
ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F
ELECTRIC W (kWH/100 lbs.) 1830(5.4) 1670(4.5)
WATER gal./24HR (gal./100 lbs.) 147(18.0) 254(28.2)
EXTERIOR DIMENSIONS (WxDxH) 30" x 27-3/8" x 37-7/16" (762 x 695 x 950 mm)
EXTERIOR FINISH Stainless Steel, Galvanized Steel (Rear)
WEIGHT Net 198 lbs. (90 kg), Shipping 258 lbs. (117 kg)
CONNECTIONS - ELECTRIC Permanent - Connection

- WATER SUPPLY Inlet 1/2" FPT

- DRAIN Outlet 3/4" 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 N/A
BIN CONTROL SYSTEM Thermostat
COMPRESSOR Hermetic, Model CS12K6E-TF5-279
CONDENSER Air-Cooled Remote, Condenser Unit URC-9F
EVAPORATOR Vertical type, Stainless Steel and Copper
REFRIGERANT CONTROL Thermostatic Expansion Valve

Condensing Pressure Regulator on URC-9F

REFRIGERANT CHARGE R404A, 9 lbs. 4 oz. (4200g)

(Icemaker 5 lbs. 5 oz. Cond. Unit 3 lbs. 15 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 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

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

notice.

13

4b. KM-901MRH (remote air-cooled) Auxiliary Code U-1 and Later

AC SUPPLY VOLTAGE 208-230/60/3
AMPERAGE 7.0A ( 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 *899 (408) 874 (397) 817 (371)
Reference without *marks 80 880 (399) 842 (382) 772 (350)

90 874 (397) *815 (370) 749 (340)

100 855 (388) 800 (363) 689 (313)
SHAPE OF ICE Crescent Cube
ICE PRODUCTION PER CYCLE 14.2 lbs. (6.4 kg) 720pcs.
APPROXIMATE STORAGE CAPACITY N/A
ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F
ELECTRIC W (kWH/100 lbs.) 1830(5.4) 1670(4.5)
WATER gal./24HR (gal./100 lbs.) 147(18.0) 254(28.2)
EXTERIOR DIMENSIONS (WxDxH) 30" x 27-3/8" x 37-7/16" (762 x 695 x 950 mm)
EXTERIOR FINISH Stainless Steel, Galvanized Steel (Rear)
WEIGHT Net 198 lbs. (90 kg), Shipping 258 lbs. (117 kg)
CONNECTIONS - ELECTRIC Permanent - Connection

- WATER SUPPLY Inlet 1/2" FPT

- DRAIN Outlet 3/4" 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 N/A
BIN CONTROL SYSTEM Mechanical Switch
COMPRESSOR Hermetic, Model CS12K6E-TF5-279
CONDENSER Air-Cooled Remote, Condenser Unit URC-9F
EVAPORATOR Vertical type, Stainless Steel and Copper
REFRIGERANT CONTROL Thermostatic Expansion Valve

Condensing Pressure Regulator on URC-9F

REFRIGERANT CHARGE R404A, 9 lbs. 4 oz. (4200g)

(Icemaker 5 lbs. 5 oz. Cond. Unit 3 lbs. 15 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 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

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

notice.

14

B. Condenser Unit

1. URC-9F

Unit: mm [in.]

15

Specications

MODEL: URC-9F

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

FAN MOTOR 115 V Total 1.3FLA 65W

EXTERIOR DIMENSIONS (WxDxH) 32-3/16" x 15-11/16" x 21-15/16" (817 x 398 x 558 mm)

DIMENSIONS INCLUDING LEGS (WxDxH) 34-5/16" x 18-1/8" x 36-15/16" (871 x 460 x 938 mm)

EXTERIOR FINISH Galvanized Steel

WEIGHT Net 81 lbs. ( 37 kg ) Shipping 92 lbs. ( 42 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 3 lbs. 14.8 oz. (1780g)

DESIGN PRESSURE High 467 PSIG

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

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

notice.

16

II. General Information

A. Construction

1. KM-901MAH (air-cooled)

Spray Tubes

Water Supply Inlet

Hot Gas Valve

Cleaning Valve

Expansion Valves

Control Switch

Float Switch

Water Pump

Junction Box

Condenser

Control Box

Fan Motor

Drier

Thermostatic Bin Control
Auxiliary Code T-0, U-0

Thermostatic Bin Control
Bracket & Bulb Holder
Auxiliary Code T-0, U-0

Compressor

Mechanical Bin Control and Bracket
Auxiliary Code U-1 and later

17

2. KM-901MWH (water-cooled)

Spray Tubes

Cleaning Valve

Expansion Valves

Control Switch

Float Switch

Water Pump

Water Supply Inlet

Hot Gas Valve

Junction
Box

Water Regulating
Valve

Control Box

Condenser

Compressor

Thermostatic Bin Control
Bracket & Bulb Holder
Auxiliary Code T-0, U-0

Drier

Thermostatic Bin Control
Auxiliary Code T-0, U-0

Mechanical Bin Control and Bracket
Auxiliary Code U-1 and later

18

3. KM-901MRH/3 (remote air-cooled)

Spray Tubes

Cleaning Valve

Expansion Valves

Water Supply Inlet

Hot Gas Valve

Junction Boxes

Control Switch

Float Switch

Water Pump

Compressor

Thermostatic Bin Control
Bracket & Bulb Holder
Auxiliary Code T-0, U-0

Control Box

Receiver Tank

Drier

Liquid Line Valve

Thermostatic Bin Control
Auxiliary Code T-0, U-0

Mechanical Bin Control and Bracket
Auxiliary Code U-1 and later

19

B. Sequence of Operation

1. Sequence Cycles and Shutdown

a) "E" Control Board: Auxiliary Code T-0, U-0

The steps in the sequence are as outlined below. When power is supplied, CB red
"POWER OK" LED comes on. There is a 5-second delay before startup. Note that the
order of the component LEDs from the outer edge of CB is 1, 4, 3, 2.

(1) 1-Minute Fill Cycle

LED 4 is on. WV energizes and the 1-minute ll cycle begins. 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 tank and closes
F/S. This serves as a low water safety to protect PM.

(2) Initial Harvest Cycle

LEDs 1, 4, and 2 are on. WV remains energized, Comp, FMR, HGV energize. CB
monitors the warming of the evaporator via the thermistor located on the suction
line. When the thermistor reaches 48°F (9°C), CB reads a 3.9 kΩ signal from
the thermistor and turns harvest termination over to the harvest timer (S4 dip
switch 1 & 2). The harvest timer has settings of 60, 90, 120, and 180 seconds. For
details, see "II.C.3.b) Harvest Timer (S4 dip switch 1 & 2)." WV is energized during
harvest for a maximum of 6 minutes or the length of harvest, whichever is shorter.
LED 4 goes off when WV de-energizes. When the harvest timer expires, 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.

(3) Freeze Cycle

LED 1 is on. Comp and FMR remain energized, PM, FM, and LLV energize, HGV
and WV de-energize. For the rst 5 minutes, CB will not accept a signal from F/S.
This minimum 5-minute freeze time is short cycle protection for Comp. At the end of
5 minutes, F/S assumes control. As ice builds on the evaporator, the water level in
the tank lowers. The freeze cycle continues until F/S opens and terminates the cycle.

(4) Pump-Out Cycle

LEDs 1, 3, and 2 are on. LED 4 is on when S4 dip switch 3 & 4 are set to 3 off and
4 on. Comp and FMR remain energized. HGV energizes. WV energizes if S4 dip
switch 3 off and 4 on. LLV and FM de-energize. PM stops for 2 seconds then
reverses, taking water from the bottom of the tank 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 ows through the small tube to power ush F/S. When the
pump-out timer expires, the pump-out is complete.

The rst pump-out occurs after the 1st freeze cycle, then every 10th cycle thereafter.
The pump-out frequency is factory set, and generally no adjustment is required.
However, where water quality is bad and the icemaker needs a pump-out more
often, the pump-out frequency can be adjusted. The pump-out frequency control
(S4 dip switch 5 & 6) can be set to have a pump-out occur every cycle, or every
2, 5, or 10 cycles. For details, see "II.C.3.d) Pump-Out Frequency Control (S4 dip
switch 5 & 6)."

20

(5) Harvest Cycle

Same as the initial harvest cycle. See "II.B.1.a)(2) Initial Harvest Cycle."
Note: Unit continues to cycle until TBC is satised or power is turned off. The unit

always restarts at the 1-minute ll cycle.

(6) Shutdown

When ice contacts the thermostatic bulb (TBC switch open), TBC shuts down the
unit within 10 seconds. TBC is factory set, and generally no adjustment is required.
However, adjustment may be needed in some conditions, particularly at higher
altitude locations. CAUTION! Do not adjust S4 dip switch 7 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.

Legend: CB–control board; Comp–compressor; FM–fan motor;
FMR–fan motor-remote; F/S–oat switch; HGV–hot gas valve; LLV –liquid line
valve; PM–pump motor; TBC–thermostatic bin control; WV–inlet water valve

b) "G" Control Board: Auxiliary Code U-1 and Later

The steps in the sequence are as outlined below. When power is supplied, CB red
"POWER OK" LED and green "BC CLOSED" LED come on. There is a 5-second delay
before startup. Note that the order of the component LEDs from the outer edge of CB is
1, 4, 3, 2.

(1) 1-Minute Fill Cycle

LED 4 is on. WV energizes and the 1-minute ll cycle begins. 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 tank and closes
F/S. This serves as a low water safety to protect PM.

(2) Initial Harvest Cycle

LEDs 1, 4, and 2 are on. WV remains energized, Comp, FMR, HGV energize. CB
monitors the warming of the evaporator via the thermistor located on the suction
line. When the thermistor reaches 48°F (9°C), CB reads a 3.9 kΩ signal from the
thermistor and turns harvest termination over to the harvest timer (S4 dip switch 1 &

2). The harvest timer has settings of 60, 90, 120, and 180 seconds. For details, see
"II.C.3.b) Harvest Timer (S4 dip switch 1 & 2)." WV is energized during harvest for a
maximum of 6 minutes or the length of harvest minus 0 or 50 seconds (harvest pump
timer (S4 dip switch 7)), whichever is shorter. CAUTION! Do not adjust S4 dip

switch 7 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.e) Bin Control Selector/Harvest Pump Timer (S4 dip switch 7)."
LED 4 goes off when WV de-energizes. LED 3 comes on and PM energizes and runs
for the last 0 or 50 seconds of harvest depending on S4 dip switch 7 setting. When
the harvest timer expires, 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.

21

(3) Freeze Cycle

LED 1 is on. Comp and FMR remain energized, PM, FM, and LLV energize. HGV
and WV de-energize. For the rst 5 minutes, CB will not accept a signal from F/S.
This minimum 5-minute freeze time is short cycle protection for Comp. At the end of
5 minutes, F/S assumes control. As ice builds on the evaporator, the water level in
the tank lowers. The freeze cycle continues until F/S opens and terminates the cycle.
There is a 15 second delay before CB acknowledges an open F/S.

(4) Pump-Out Cycle

LEDs 1, 3, and 2 are on. LED 4 is on when S4 dip switch 3 & 4 are set to 3 off and
4 on. Comp and FMR remain energized, HGV energizes, WV energizes if S4 dip
switch 3 off and 4 on. LLV and FM de-energize. PM stops for 2 seconds then
reverses, taking water from the bottom of the tank 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 ows through the small tube to power ush F/S. When the
pump-out timer expires, the pump-out is complete.

The rst pump-out occurs after the 11th freeze cycle, then every 10th cycle
thereafter. The pump-out frequency control is factory set, and generally no
adjustment is required. However, where water quality is bad and the icemaker needs
a pump-out more often, the pump-out frequency can be adjusted. The pump-out
frequency control (S4 dip switch 5 & 6) can be set to have a pump-out occur every
cycle, or every 2, 5, or 10 cycles. Timing of the rst pump-out is dependent on S4
dip switch 5 & 6 settings. See the table below. For details, see "II.C.3.d) Pump-Out
Frequency Control (S4 dip switch 5 & 6)."

"G" Control Board Settings

S4 Dip Switch Setting

No. 5 No. 6

OFF OFF Every cycle After 2nd freeze cycle

ON OFF Every 2 cycles After 3rd freeze cycle

OFF ON Every 5 cycles After 6th freeze cycle

ON ON Every 10 cycles After 11th freeze cycle

Pump-Out

Frequency

1st Pump-Out

(5) Harvest Cycle

Same as the initial harvest cycle. See "II.B.1.b)(2) Initial Harvest Cycle."
Note: Unit continues to cycle until MBC is satised or power is turned off. The unit

always restarts at the 1-minute ll cycle.

22

(6) Shutdown

When MBC is activated (MBC open), the yellow "BC OPEN" LED comes on. The unit
then shuts down as outlined in the table below.

Cycle at
Mechanical Bin
Control Activation

Fill Cycle 15 seconds after activation.

Harvest Cycle At the end of the harvest cycle, or up to 15 seconds into the freeze cycle if activated

Freeze Cycle 15 seconds after activation if activated at least 15 seconds before the 5-minute short

Shutdown

at the end of the harvest cycle.

cycle protection timer expires. Otherwise, at the end of the next harvest cycle.

Legend: CB–control board; Comp–compressor; FM–fan motor;
FMR–fan motor-remote; F/S–oat switch; HGV–hot gas valve; LLV –liquid line
valve; MBC–mechanical bin control; PM–pump motor; WV–inlet water valve

23

2. Sequence Flow Chart

a) "E" Control Board: Auxiliary Code T-0, U-0

10th cycle (S4 dip

switch 5 & 6)

for 2 sec., then

reverses for 10/20

sec. (S4 dip switch

F/S in control

3 & 4)

Comp continues

FMR continues

HGV energized

PM de-energizes for 2 sec.,

then reverses for 10/20 sec.

FM de-energized

LLV de-energized

F/S open or freeze

timer expires

4. Pump-Out Cycle

•Factorysetforevery

•Pumpmotorstops

KM-901MAH, KM-901MWH, KM-901MRH/3

"E" Control Board Sequence Flow Chart

2. Harvest Cycle 3. Freeze Cycle

1. 1-Minute Fill

•Minimumfreezetime:5min.

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

Cycle

5-min. timer

(S4 dip switch 9 & 10

•Maximumfreezetime:freezetimersetting

whichever is shorter.

•Maximumharvesttime:20min.

in control

1 to 3-min. timer in control

(S4 dip switch 1 & 2)

Thermistor in control

F/S closed

F/S Check

F/S closed

F/S Check

Comp continues

FMR continues

Thermistor temperature

reaches 48°F (9°C)

WV continues

Comp energized

WV energized

PM energized

(3.9 kΩ or less) Harvest

HGV energized

F/S open

FM energized

timer starts

FMR energized

LLV energized

HGV de-energized

WV de-energized

F/S open

If F/S is open, compressor stops and cycle returns to 1-Minute Fill Cycle

3. Ice Level Lowered

2. Icemaker Off

1. Bin Full

To 1 above

Ice level lowered. No ice

touching thermostatic

bulb. Icemaker starts at

"1. 1-Minute Fill Cycle."

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

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

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

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

inside of the evaporator plate assembly.

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

TBC closed

All components

de-energized.

Unit shuts down

within 10 sec.

after ice contacts

thermostatic bulb.

TBC open

All components

de-energized

control switch is placed in the "ICE" position.

Cycle Steps

Initial startup

Legend:

Comp–compressor

FM–fan motor

FMR–fan motor-remote

F/S–oat switch

HGV–hot gas valve

LLV–liquid line valve

TBC–thermostatic bin control

PM–pump motor

WV–inlet water valve

Ice contacts

thermostatic bulb

Shutdown

and Restart

begins here

after 5 sec.

delay

24

TBC Operation

b) "G" Control Board: Auxiliary Code U-1 and Later

10th cycle (S4 dip

switch 5 & 6)

for 2 sec., then

reverses for 10/20

sec. (S4 dip switch

F/S in control

5-min. timer

in control

3 & 4)

Comp continues

F/S open or freeze

F/S closed

FMR continues

timer expires

Comp continues

HGV energized

FMR continues

PM energized

PM de-energizes for 2 sec.,

then reverses for 10/20 sec.

FM de-energized

FMS energized

LLV energized

HGV de-energized

LLV de-energized

3. Ice Level Lowered

2. Icemaker Off

4. Pump-Out Cycle

3. Freeze Cycle

•Factorysetforevery

•Minimumfreezetime:5min.

•Pumpmotorstops

(S4 dip switch 9 & 10)

•Maximumfreezetime:freezetimersetting

To 1 above

Ice level lowered. No ice

pressing against MBC actuator

paddle. Icemaker starts at

"1. 1-Minute Fill Cycle."

MBC closed

Green "BC CLOSED" LED on

Yellow "BC OPEN" LED off

All components

de-energized.

"G" Control Board Sequence Flow Chart

KM-901MAH, KM-901MWH, KM-901MRH/3

2. Harvest Cycle

50 sec. (S4 dip switch 7), whichever is shorter. DO

NOT ADJUST S4 dip switch 7 on this model.

•WVtime:6min.orthelengthofharvestminus0or

•Maximumharvesttime:20min.

Fill Cycle

1. 1-Minute

1 to 3-min. timer in control

(S4 dip switch 1 & 2)

Thermistor in

control

Harvest Pump

Timer

F/S check

0 or 50 sec.

PM energized

WV de-energized

F/S closed

F/S check

Thermistor temperature

reaches 48°F (9°C) (3.9 kΩ

or less). Harvest timer starts.

WV continues

Comp energized

FMR energized

HGV energized

F/S open

WV energized

F/S open

If F/S is open, compressor stops and cycle returns to 1-Minute Fill Cycle

1. Bin Full

Shutdown Delay:

•Fill Cycle–15 sec. after activation.

•Harvest Cycle–At the end of the harvest cycle, or up to 15 sec. into the

Yellow "BC OPEN" LED continues.

All components de-energized

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

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

supplied to the pump motor. With the cleaning valve closed, the cleaner and sanitizer ow over the outside of the evaporator plate

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

assembly.

Note: Close the cleaning valve after cleaning and sanitizing are complete, otherwise the unit will not restart when the control

switch is placed in the "ICE" position.

freeze cycle if activated at the end of the harvest cycle.

5-min. short cycle protection timer expires. Otherwise, at the end

of the next harvest cycle.

•Freeze Cycle–15 sec. after activation if activated at least 15 sec. before the

MBC open

Green "BC CLOSED" LED off

Yellow "BC OPEN" LED on

Cycle Steps

Initial startup

Shutdown

and Restart

begins here

after 5-sec.

delay

MBC Operation

Legend:

Comp–compressor

FM–fan motor

FMR–fan motor-remote

F/S–oat switch

HGV–hot gas valve

LLV–liquid line valve

MBC–mechanical bin control

PM–pump motor

WV–inlet water valve

25

C. Control Board

•AHoshizakiexclusivesolid-statecontrolboardisemployedinKM-901MAH,

KM-901MWH, and KM-901MRH/3 Modular Crescent Cubers.

•Allmodelsarepretestedandfactoryset.

CAUTION

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

2. The control board contains integrated circuits, which are susceptible to
failure due to static discharge. It is especially important to touch the metal
part of the unit before handling or replacing the control board.

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

4. Do not change wiring and connections. Do not misconnect K3, K4, and K5,
because the same connector is used for the thermistor, mechanical bin
control, and oat switch. K4 is not used on "E" control board models.

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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1. Control Board Layout

a) "E" Control Board: Auxiliary Code T-0, U-0

"E" Control Board

"ALARM RESET" Button

Freeze Timer LED

S4 Dip Switch

"OUTPUT TEST" Button
(used to test relays on control board)

WHITE K3 Connector
Harvest Control
(thermistor)

Harvest Timer LED

Alarm Buzzer

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

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

LED 2 (X2 Relay)
Hot Gas Valve (HGV)
Fan Motor (FM) (FM off
when LED on)
Liquid Line Valve (LLV)

LED 3 (X3 Relay)
Pump Motor (PM)
(on at pump-out only)

LED 4 (X4 Relay)
Inlet Water Valve (WV)

LED 1 (X1 Relay)
Compressor (Comp),
Fan Motor-Remote
(FMR)

RED K4 Connector
Mechanical Bin Control
(not used on units with
themostatic bin control)

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

BLACK K5 Connector
Float Switch

Part Number

K1 Ten-Pin Connector

Pins #1 through #10
#1, 9 Magnetic Contactor
#2 Hot Gas Valve (HGV)
#3 Fan Motor (FM),
Liquid Line Valve (LLV)
#4 Pump Motor (icemaking)
#5 Pump Motor (pump-out)
#6 Inlet Water Valve (WV)
#7, 10 Component Power
Supply
#8 Open

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

K2 Connector
Transformer

"E" Control Board

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

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