Hoshizaki KM-901MWH User Manual

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Page 1

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

Revised: 6-23-2009

Page 2

IMPORTANT

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

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

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

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

Attn: Hoshizaki Technical Support Department

Phone: 1-800-233-1940 Technical Support (770) 487-2331 Fax: 1-800-843-1056 (770) 487-3360 E-mail: techsupport@hoshizaki.com

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. 

Page 3

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

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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

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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

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Important Safety Information

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

Page 7

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.

Page 8

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

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

- 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.

Page 9

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.

Page 10

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

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

- 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.

Page 11

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

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.

Page 12

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

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

- WATER SUPPLY Inlet 1/2" FPT

- DRAIN Outlet 3/4" FPT

Condensing Pressure Regulator on URC-9F

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

-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.

Page 13

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

Condensing Pressure Regulator on URC-9F

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

-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.

Page 14

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

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

- WATER SUPPLY Inlet 1/2" FPT

- DRAIN Outlet 3/4" FPT

Condensing Pressure Regulator on URC-9F

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

-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.

Page 15

B. Condenser Unit

1. URC-9F

Unit: mm [in.]

Page 16

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.

Page 17

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

Page 18

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

Page 19

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

Page 20

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)."

Page 21

(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

(2) Initial Harvest Cycle

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.

Page 22

(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.

Page 23

(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

Page 24

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

TBC Operation

Page 25

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

Page 26

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.

Page 27

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)

Page 28

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

"G" Control Board

Bin Control Switch Closed LED (green) (on continuously in thermostatic bin control application)

Bin Control Switch Open LED (yellow) (mechanical bin control application only)

Part Number

Alarm Buzzer

Power LED (red) (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, harvest (if applicable))

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

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

"ALARM RESET" Button

S4 Dip Switch

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

WHITE K3 Connector Harvest Control (thermistor)

RED K4 Connector Mechanical Bin Control or K4 Jumper (thermostatic bin control application)

S5 Dip Switch

BLACK K5 Connector Float Switch

Label (control board revision level indicated on label on side of relay)

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, harvest (if applicable)) #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

"G" Control Board

Part Number 2A3792-01

Page 29

2. Features

a) Maximum Water Supply Period - 6 minutes

"E" control board: The inlet water valve is open during harvest for 6 minutes or the length of harvest, whichever is shorter. "G" control board: The inlet water valve is open during harvest for 6 minutes or the length of harvest minus 0 or 50 seconds (harvest pump timer (S4 dip switch 7)), whichever is shorter. For details, see "II.C.3.e) Bin Control Selector/Harvest Pump Timer (S4 dip switch 7)."

b) Harvest Backup Timer and Freeze Timer

The harvest backup timer shuts down the icemaker if, for two cycles in a row, the harvest cycle takes more than 20 minutes to complete. The control board signals this problem using 2 beeps every 3 seconds. The freeze timer shuts down the icemaker if, for two cycles in a row, the freeze cycle takes longer than the time specied to complete. The control board signals this problem using 3 beeps every 3 seconds. The freeze timer is factory set using S4 dip switch 9 &10. For details, see "II.C.3.g) Freeze Timer (S4 dip switch 9 & 10)." The "ALARM RESET" button on the control board must be pressed with power on to reset either of these safeties.

c) High Temperature Safety

The temperature of the suction line in the refrigeration circuit is limited by the high temperature safety. This protects the unit from excessively high temperatures. If the evaporator temperature reaches 127°F±7°F (53°C±4°C), the control board reads a .8 kΩ signal from the thermistor and shuts down the icemaker. The control board will signal this problem using 1 beep every 3 seconds. The "ALARM RESET" button on the control board must be pressed with power on to reset the safety.

d) Low Water Safety

The control board checks the position of the oat switch at the end of the initial 1-minute ll cycle and at the end of each harvest cycle. If the oat switch is in the up position (electrical circuit closed), the control board changes to the next cycle. If the oat switch is in the down position (electrical circuit open), the control board changes to additional 1-minute ll cycles until water enters the tank and closes the oat switch. When the oat switch closes, the control board changes to the next cycle. The unit will not start without adequate water in the tank. This serves as a low water safety to protect the water pump. For water-cooled model, if the condenser water supply is shut off, the unit is protected by the high-pressure switch.

e) High Voltage and Low Voltage Cut-outs

The maximum and minimum allowable supply voltages of this icemaker are limited by the high voltage and low voltage cut-outs. If miswiring (especially on single phase 3 wire models) causes excessive voltage (147Vac±5% or more), the high voltage cut-out shuts down the circuit in 3 seconds and the icemaker automatically stops. The control board will signal this problem using 7 beeps every 3 seconds. The icemaker also automatically stops in cases of insufficient voltage (92Vac±5% or less). The control board will signal this problem using 6 beeps every 3 seconds. When the proper supply voltage is resumed, the icemaker automatically starts running again.

Page 30

f) LED Lights and Audible Alarm Safeties

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

At startup, a 5-second delay occurs while the control board conducts an internal timer check. A beep occurs when power is turned off. The red LED indicates proper control voltage and remains on unless a control voltage problem occurs. The green LEDs 1 through 4 energize and sequence from initial startup as listed in the table below. Note that the order of the LEDs from the outer edge of the control board is 1, 4, 3, 2. For details, see "II.B. Sequence of Operation."

Sequence Step LED

1-Minute Fill Cycle 4 WV 1 minute Harvest Cycle 1, 4, 2 Comp, FMR, WV,

Freeze Cycle 1 Comp, FM/FMR, PM,

Pump-Out Cycle 1, 4*, 3, 2 Comp, FMR, WV*,

Energized

Components

HGV

LLV

PM, HGV

Min. Max. Avg.

2 minutes 20 minutes 3 to 5 minutes

5 minutes freeze timer

10 seconds 20 seconds *pump-out timer setting

Time LEDs are On

30 to 35 minutes

setting

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

No. of Beeps

(every 3 sec.)

1 High Evaporator Temp.

(temperature > 127°F) (53°C)

2 Harvest Backup Timer

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

3 Freeze Timer

(freeze > freeze timer setting for two cycles in a row)

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

6 Low Voltage

(92Vac±5% or less)

7 High Voltage

(147Vac±5% or more)

Type of Alarm Notes

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

Orange "H TIMER" LED on. Check for open thermistor, HGV not opening, TXV or LLV leaking by, low charge, inefficient Comp, or WRV leaking by.

Yellow "F TIMER" LED on. Check for F/S stuck closed (up), WV leaking by, HGV leaking by, PM not pumping, TXV not feeding properly, LLV not opening, low charge, HM not bypassing, or inefficient Comp.

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

Legend: Comp–compressor; FM–fan motor; FMR–fan motor-remote; F/S–oat switch; HGV–hot gas valve; HM–headmaster (C.P.R.); L LV –liquid line valve; PM–pump motor; TXV–thermostatic expansion valve; WRV–water regulating valve; WV–inlet water valve

Page 31

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

At startup, a 5-second delay occurs while the control board conducts an internal timer check. A beep occurs when the control switch is moved to the "ICE" position. The red LED indicates proper control voltage and remains on unless a control voltage problem occurs. The green LEDs 1 through 4 energize and sequence from initial startup as listed in the table below. Note that the order of the LEDs from the outer edge of the control board is 1, 4, 3, 2. For details, see "II.B. Sequence of Operation."

Sequence Step LED

1-Minute Fill Cycle 4 WV 1 minute Harvest Cycle 1, 4, 2 Comp, FMR, WV, HGV 2 minutes 20 minutes 3 to 5 minutes Harvest Pump Timer 1, 3, 2 Comp, FMR, PM, HGV 0 seconds 50 seconds harvest pump timer

Freeze Cycle 1 Comp, FM/FMR, PM,

LLV

Pump-Out Cycle 1, 4*, 3, 2 Comp, FMR, WV*, PM,

HGV

Energized

Components

Min. Max. Avg.

5 minutes freeze timer

10 seconds 20 seconds *pump-out timer

Time LEDs are On

setting 30 to 35 minutes

setting

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

No. of Beeps

(every 3 sec.)

1 High Evaporator Temp.

(temperature > 127°F) (53°C)

2 Harvest Backup Timer

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

3 Freeze Timer

(freeze > freeze timer setting for two cycles in a row)

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

6 Low Voltage

(92Vac±5% or less)

7 High Voltage

(147Vac±5% or more)

Type of Alarm Notes

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

Check for open thermistor, HGV not opening, TXV or LLV leaking by, low charge, inefficient Comp, or WRV leaking by.

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

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

Legend: Comp–compressor; FM–fan motor; FMR–fan motor-remote; F/S–oat switch; HGV–hot gas valve; HM–headmaster (C.P.R.); LLV–liquid line valve; PM–pump motor; TXV–thermostatic expansion valve; WRV–water regulating valve; WV–inlet water valve

Page 32

3. Controls and Adjustments

CAUTION

Dip switches are factory set. Failure to maintain factory settings may adversely affect performance and warranty coverage. For more information, contact Hoshizaki Technical Support at 1-800-233-1940.

a) Default Dip Switch Settings

The dip switches are factory set to the following positions:

S4 Dip Switch

S4 Dip Switch No. 1 2 3 4 5 6 7 8 9 10

KM-901MAH ON OFF ON OFF ON ON OFF OFF OFF ON

KM-901MWH ON OFF ON OFF ON ON OFF OFF OFF ON

KM-901MRH/3 ON OFF ON OFF ON ON OFF OFF OFF ON

S5 Dip Switch

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

S5 Dip Switch No. 1 2 3 4 5

KM-901MAH OFF OFF OFF OFF OFF

KM-901MWH OFF OFF OFF OFF OFF

KM-901MRH/3 OFF OFF OFF OFF OFF

Freeze Timer (9 & 10)

Factory Use (8)

Bin Control Selector (7) "E" Control Board Harvest Pump Timer (7) "G" Control Board (Do Not Adjust)

Pump-Out Frequency Control (5 & 6)

Pump-Out Timer (3 & 4)

Harvest Timer (1 & 2)

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

The harvest timer when the thermistor reads 48°F (9°C) at the evaporator outlet and the control board reads the thermistor's 3.9 kΩ signal. The harvest timer is factory set, and generally no adjustment is required. However, a setting longer than the factory setting may be advised in cases where the ush provided at harvest needs to be prolonged for extra cleaning. Before changing this setting, contact Hoshizaki Technical Support at 1-800-233-1940 for recommendations. Keep in mind that setting the harvest timer to a longer setting decreases 24-hour production.

Note that the pump-out timer (S1 dip switch 3 & 4) acts in place of the harvest timer

during cycles with a pump-out. For details, see "II.C.3.c) Pump-Out Timer (S1 dip switch 3 & 4)."

S4 Dip Switch Setting

No. 1 No. 2

OFF OFF 60

ON OFF 90

OFF ON 120

ON ON 180

Time

(seconds)

Page 33

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

When a pump-out is called for, the pump motor de-energizes after the preceding freeze cycle. The pump motor energizes 2 seconds later in the reverse direction, 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 the oat switch. The pump motor drains the water tank for the time determined by the pump-out timer. The pump-out timer also acts in place of the harvest timer during cycles with a pump-out. The pump-out timer is factory set, and generally no adjustment is required. However, where water quality is bad and the icemaker needs a longer pump-out time, the pump-out timer can be adjusted. The pump-out timer control can be set to pump-out for 10 or 20 seconds.

S4 Dip Switch Setting Time (seconds)

OFF OFF 10 150 Closed

ON OFF 10 180 Closed

OFF ON 10 120 Open

ON ON 20 180 Closed

Inlet

Water

ValveNo. 3 No. 4 T1 T2

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

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

The pump-out frequency control is factory set to drain the water tank every 10 cycles, and generally no adjustment is required. However, where water quality is bad and the icemaker needs a pump-out more often, the pump-out frequency can be adjusted. The pump-out frequency control 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 the control board. "E" control board rst pump-out is after the rst freeze cycle. "G" control board rst pump-out is dependent on S4 dip switch 5 & 6. See the table below.

"E" & "G" Control Board Settings 1st Pump-Out

S4 Dip Switch Setting

No. 5 No. 6

OFF OFF Every cycle After 1st freeze 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

"E" Control Board "G" Control Board

Page 34

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

Depending on the control board, S4 dip switch 7 is either a bin control selector or harvest pump timer.

CAUTION

Do not adjust. This dip switch must be left in the factory default position or this unit will not operate correctly.

(1) Bin Control Selector, "E" Control Board: Auxiliary Code T-0, U-0

Factory set for proper operation. Do not adjust. When set to the on position on a unit with a thermostatic bin control, a 5-beep alarm sounds (open circuit) and the unit does not operate.

"E" Control Board

S4 Dip Switch Setting

No. 7

ON Mechanical

OFF Thermostatic

(2) Harvest Pump Timer, "G" Control Board: Auxiliary Code U-1 and Later

Factory set for proper operation. Do not adjust. Depending on the harvest pump timer setting, the pump motor energizes and runs the last 0 or 50 seconds of harvest. The water valve is energized during harvest for a maximum of 6 minutes or the length of harvest minus 0 or 50 seconds (determined by the harvest pump timer setting), 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.

Bin Control

"G" Control Board

S4 Dip Switch Setting

No. 7

ON 50

OFF 0

Pump Motor

Time (seconds)

f) Factory Use (S4 dip switch 8)

Factory set for proper operation. Do not adjust. This must be left in the factory default position.

Page 35

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

CAUTION

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

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

S4 Dip Switch Setting

No. 9 No. 10

OFF OFF 60

OFF ON 50

ON OFF 70

ON ON 60

Time

(minutes)

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

CAUTION

Do not adjust. This must be left in the factory default position or the unit will not operate correctly.

Factory set. S5 dip switch 1 allows for single or double oat switch applications. The KM-901MAH, KM-901MWH, and KM-901MRH/3 use a single oat switch.

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

CAUTION

Do not adjust. These must be left in the factory default position or the unit will not operate correctly.

Factory set. S5 dip switch 2 through 5 allows for rells during the freeze cycle. The KM-901MAH, KM901MWH, and KM-901MRH/3 do not rell.

Page 36

D. Bin Control

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

CAUTION

When the ambient temperature is below 45°F (7°C), the thermostatic bin control switch opens and shuts down the icemaker even if the ice storage bin is empty. When the thermostat is set in the prohibited range, the icemaker operates continuously even if the ice storage bin is lled with ice. Setting in the prohibited range may result in severe damage to the icemaker.

The thermostatic bin control switch is a temperature controlled switch used to control the level of ice in the bin. It is in line with the power supply to the control switch. The thermostatic bin control switch shuts down the unit within 10 seconds when ice contacts the thermostatic bulb, regardless of the cycle at activation. The thermostatic bin control is factory set, and generally no adjustment is required. However, adjustment may be needed in some conditions, particularly at higher altitude locations. For further details, see "IV.C.1. Thermostatic Bin Control Check."

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

The mechanical bin control is a lever-actuated bin control switch used to control the level of ice in the bin. The mechanical bin control connects to the control board RED K4 connector. When the actuator paddle is not engaged (mechanical bin control switch closed; control board green "BC CLOSED" LED on), the unit produces ice. When the actuator paddle is engaged (mechanical bin control switch open; control board yellow "BC OPEN" LED on), the unit 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

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

Shutdown

activated at the end of the harvest cycle.

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

E. Float Switch

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

F. Thermistor

The thermistor is used as a harvest control sensor. The thermistor's resistance varies depending on the suction line temperature. The control board monitors the resistance to start the harvest timer. No adjustment is required.

G. Control Switch

The control switch has three positions: "OFF" for power off, "ICE" for icemaking, and "WASH" to activate the water pump when cleaning and sanitizing.

Page 37

III. Technical Information

A. Water Circuit and Refrigeration Circuit

1. KM-901MAH (air-cooled)

Spray Tubes

Water Supply

Cleaning Valve

Inlet Water Valve

Float Switch

Drain

Water Tank

Thermistor

Water Pump

Pump-Out

Freeze

Condenser

Evaporator

Fan

Drier

Suction Line

Access Valve

Compressor

High Pressure Switch

Strainer

Hot Gas Val ve

Check Valves

Access Val ve

Discharge Line

Refrigeration Circuit

Water Circuit

Expansion Valves

Check Valve

Page 38

2. KM-901MWH (water-cooled)

Water Regulating Val ve

Water Supply

Cleaning Valve

Inlet Water Valve

Float Switch

Drain

Spray Tubes

Water Tank

Thermistor

Water Pump

Pump-Out

Freeze

Evaporator

Condenser

Drier

Suction Line

Access Valve

Compressor

Drain

Water Supply

High Pressure Switch

Strainer

Hot Gas Val ve

Check Valves

Access Val ve

Discharge Line

Refrigeration Circuit

Water Circuit

Expansion Valves

Check Valve

Page 39

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

Condenser

Spray Tubes

Inlet Water Valve

Fan

Headmaster (C.P.R.)

Access Val ve

Water Supply

Cleaning Valve

Float Switch

Drain

Water Tank

Thermistor

Water Pump

Pump-Out

Freeze

Receiver Tank

Evaporator

Liquid Line Val ve

Suction Line

Access Valve

Compressor

Drier

High Pressure Switch

Strainer

Hot Gas Val ve

Check Valves

Access Val ve

Discharge Line

Refrigeration Circuit

Water Circuit

Expansion Valves

Check Valve

Page 40

B. Wiring Diagrams

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

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

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

Transformer Output

10.5V at 115V

PSIG

PSIG 384±

* High Pressure Switch

Air-Cooled Model Water-Cooled Model

Cut-in 327±21 PSIG 284±21 PSIG

Cut-out 412±

Page 41

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

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

Transformer Output

10.5V at 115V

PSIG

* High Pressure Switch

Cut-out 412±

Cut-in 327±21 PSIG

Page 42

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

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

Transformer Output

10.5V at 115V

* High Pressure Switch

PSIG

Cut-out 412±

Cut-in 327±21 PSIG

Page 43

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

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

Mechanical Bin Control: Auxiliary Code U-1 and Later

Transformer Output

10.5V at 115V

PSIG

PSIG 384±

0 0

* High Pressure Switch

Air-Cooled Model Water-Cooled Model

Cut-in 327±21 PSIG 284±21 PSIG

Cut-out 412±

Page 44

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

Mechanical Bin Control: Auxiliary Code U-1 and Later

Transformer Output

10.5V at 115V

PSIG

* High Pressure Switch

Cut-out 412±

Cut-in 327±21 PSIG

Page 45

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

Mechanical Bin Control: Auxiliary Code U-1 and Later

Transformer Output

10.5V at 115V

* High Pressure Switch

PSIG

Cut-in 327±21 PSIG

Cut-out 412±

Page 46

C. Performance Data

1. KM-901MAH (air-cooled)

APPROXIMATE ICE PRODUCTION PER 24 HR.

lbs./day kg./day 100/38 826 375 721 327 646 293 APPROXIMATE ELECTRIC CONSUMPTION

watts 100/38 APPROXIMATE WATER CONSUMPTION PER 24 HR.

gal./day m3/day 100/38 175 0.66 139 0.52 103 0.39 FREEZING CYCLE TIME

min. 100/38 HARVEST CYCLE TIME

min. 100/38 HEAD PRESSURE

AMBIENT TEMP.

(ºF/ºC) 50/10 70/21 90/32

70/21 874 396 832 378 785 356

80/27 842 382 778 353 736 334

90/32 832 378 732 332 687 312

70/21

80/27

90/32

70/21 240 0.91

80/27 219 0.83 175 0.66 158 0.60

90/32 212 0.80 143 0.54 123 0.46

70/21

80/27

90/32

70/21

80/27 90/32

70/21 219 15.4

80/27 234 16.4 263 18.5 284 20.0 90/32 238 16.7 284 20.0 306 21.5

1600

1625

1632

1631

4.3

4.0

3.9 2.6

3.3

WATER TEMP. (ºF/ºC)

1632

1675

1710

1715

212 0.80 187 0.71

3.9

3.3

2.8

2.7

238 16.7 261 18.3

1658

1691

1731

1750

3.6

3.1

2.4

PSIG kg/cm2G 100/38 242 17.0 289 20.3 327 23.0 SUCTION PRESSURE

PSIG kg/cm2G 100/38 38 2.7 42 3.0 50 3.5

TOTAL HEAT OF REJECTION FROM CONDENSER

70/21 35 2.5 37 2.6 41 2.9

80/27 36 2.6 39 2.7 44 3.1 90/32 37 2.6 41 2.9 46 3.2

15,400 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]

Note:

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

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

Page 47

2. KM-901MWH (water-cooled)

APPROXIMATE ICE PRODUCTION PER 24 HR.

lbs./day kg./day 100/38 878 398 825 374 751 341 APPROXIMATE ELECTRIC

CONSUMPTION

watts 100/38 APPROXIMATE WATER CONSUMPTION PER 24 HR.

gal./day m3/day 100/38 1360 5.15 1493 5.65 2559 9.69 FREEZING CYCLE TIME

min. 100/38 HARVEST CYCLE TIME

min. 100/38 HEAD PRESSURE

AMBIENT TEMP.

(ºF/ºC)

70/21 912 414 889 403 849 385 80/27 895 406 860 390 815 370

90/32 889 403 835 379 791 359

70/21

80/27 90/32

70/21 876 3.32

80/27 981 3.71 1194 4.52 1893 7.17

90/32 1013 3.84 1344 5.09 1977 7.48

70/21 80/27

90/32

70/21

80/27 90/32

70/21 227 16.0 80/27 229 16.1 233 16.4 247 17.4

90/32 230 16.1 236 16.6 249 17.5

50/10 70/21 90/32

1480

1500 1506

1505

4.1

3.9

3.8 2.93.1

3.4

WATER TEMP. (ºF/ºC)

1506

1541

1570

1574

1013 3.84 1530 5.79

19 19

3.8

3.4

3.0

230 16.1 240 16.9

1527

1553 1586

1600

20 21

3.6

3.3

2.7

PSIG kg/cm2G 100/38 234 16.4 239 16.8 260 18.3 SUCTION PRESSURE

PSIG kg/cm2G 100/38 36 2.5 38 2.7 45 3.2

TOTAL HEAT OF REJECTION FROM CONDENSER

TOTAL HEAT OF REJECTION FROM COMPRESSOR 2,100 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)] WATER FLOW FOR CONDENSER 100 gal./h [AT 100ºF (38ºC) / WT 90ºF (32ºC)]

PRESSURE DROP OF COOLING WATER LINE less than 10 PSIG

70/21 33 2.3 34 2.4 38 2.6

80/27 34 2.4 36 2.5 40 2.8 90/32 34 2.4 37 2.6 41 2.9

13,500 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]

Note:

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

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

Page 48

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

APPROXIMATE ICE PRODUCTION PER 24 HR.

lbs./day kg./day 100/38 843 382 771 350 668 303 APPROXIMATE ELECTRIC

CONSUMPTION

watts 100/38 APPROXIMATE WATER CONSUMPTION PER 24 HR.

gal./day m3/day 100/38 182 0.69 147 0.56 112 0.42 FREEZING CYCLE TIME

min. 100/38 HARVEST CYCLE TIME

min. 100/38 HEAD PRESSURE

AMBIENT TEMP.

(ºF/ºC)

70/21 889 403 859 389 803 364 80/27 866 393 818 371 755 343

90/32 859 389 785 356 724 328

70/21

80/27

90/32

70/21 246 0.93

80/27 225 0.85 182 0.69 165 0.63

90/32 219 0.83 152 0.57 131 0.50

70/21 80/27

90/32

70/21

80/27 90/32

70/21 208 14.6 80/27 224 15.7 256 18.0 277 19.5

90/32 229 16.1 279 19.6 301 21.2

50/10 70/21 90/32

1590

1630

1643

1630

4.3

4.0

3.9 2.7

3.4

WATER TEMP. (ºF/ºC)

1643

1712

1770

1771

219 0.83 194 0.74

20 21

3.9

3.4

2.9

2.8

229 16.1 252 17.7

1664

1705

1775

1780

3.6

3.2

2.4

21 23

PSIG kg/cm2G 100/38 232 16.3 284 20.0 322 22.6 SUCTION PRESSURE

PSIG kg/cm2G 100/38 38 2.7 44 3.1 51 3.6

TOTAL HEAT OF REJECTION FROM CONDENSER

TOTAL HEAT OF REJECTION FROM COMPRESSOR CONDENSER VOLUME 121 CU. IN (URC-9F)

70/21 35 2.5 37 2.6 41 2.9

80/27 37 2.6 40 2.8 45 3.1 90/32 37 2.6 43 3.0 47 3.3

14,000 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]

2,200 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]

Note:

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

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

Page 49

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

APPROXIMATE ICE PRODUCTION PER 24 HR.

lbs./day kg./day 100/38 855 388 800 363 689 313 APPROXIMATE ELECTRIC

CONSUMPTION

watts 100/38 APPROXIMATE WATER CONSUMPTION PER 24 HR.

gal./day m3/day 100/38 185 0.70 144 0.54 123 0.46 FREEZING CYCLE TIME

min. 100/38 HARVEST CYCLE TIME

min. 100/38 HEAD PRESSURE

AMBIENT TEMP.

(ºF/ºC)

70/21 899 408 874 397 817 371 80/27 880 399 842 382 772 350

90/32 874 397 815 370 749 340

70/21

80/27

90/32

70/21 254 0.96

80/27 230 0.87 181 0.69 174 0.66

90/32 222 0.84 147 0.56 134 0.51

70/21 80/27

90/32

70/21

80/27 90/32

70/21 206 14.5 80/27 220 15.5 249 17.5 272 19.1

90/32 225 15.8 270 19.0 293 20.6

50/10 70/21 90/32

1670

1706

1717

1716

4.4

4.0

3.9 2.6

3.4

WATER TEMP. (ºF/ºC)

1717

1779

1830

1837

222 0.84 203 0.77

20 21

3.9

3.3

2.8

2.7

225 15.8 248 17.5

1755

1803

1861

1890

21 23

3.6

3.2

2.4

PSIG kg/cm2G 100/38 229 16.1 275 19.4 315 22.1 SUCTION PRESSURE

PSIG kg/cm2G 100/38 39 2.7 43 3.0 49 3.4

TOTAL HEAT OF REJECTION FROM CONDENSER

TOTAL HEAT OF REJECTION FROM COMPRESSOR CONDENSER VOLUME 121 CU. IN (URC-9F)

70/21 36 2.5 38 2.7 41 2.9

80/27 37 2.6 40 2.8 44 3.1 90/32 38 2.7 42 3.0 46 3.2

14,100 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]

2,200 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]

Note:

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

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

Page 50

IV. Service Diagnosis

WARNING

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

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

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

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

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

Maintenance."

A. Diagnostic Procedure

The diagnostic procedure is basically a sequence check which can be used at unit startup or for system diagnosis. This procedure allows you to diagnose electrical system and component failures. Before conducting the diagnostic procedure, check for correct installation, proper voltage per unit nameplate, and adequate water supply. Check CB using the steps in "IV.B. Control Board Check." Check the dip switch settings to assure that S4 dip switch 3, 4, 7, 8, 9, & 10 and S5 dip switch 1 through 5 ("G" CB) are in the factory default position. S4 dip switch 1, 2, 5, & 6 are cleaning adjustments and the settings are exible. For factory default settings, see "II.C.3.a) Default Dip Switch Settings." As you go through the procedure, check to assure the components energize and de-energize correctly. If not, those components and controls are suspect.

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

2) Turn on the power supply, then move the control switch to the "ICE" position. A 5-second delay occurs. The red "POWER OK" LED on CB comes on. On "G" CB, the green "BC CLOSED" LED also comes on. If the yellow "BC OPEN" LED is on (indicating a full bin), check MBC. See "IV.C.2.a) Mechanical Bin Control Check."

WARNING

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

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

Page 51

3) 1-Minute Fill Cycle – LED 4 is on. WV energizes. After 1 minute, CB checks for a closed F/S. If F/S is closed, the harvest cycle begins. If closed, continue to step 4. If open, WV remains energized through additional 1-minute ll cycles until water lls the tank and closes F/S (low water safety). Diagnosis: If WV does not open, check the supply voltage at WV terminals, check continuity on the coil, conrm the screen or external lter is not plugged (no water ow). If unit fails to start harvest, check for open F/S or bad 1-minute timer in CB. See "IV.D. Float Switch Check and Cleaning" and "IV. B. Control Board Check."

4) 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)." 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.

"E" CB: WV is energized during harvest for a maximum of 6 minutes or the length of

harvest, whichever is shorter.

"G" CB: 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. 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. 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)."

Diagnosis: Check if Comp is running, HGV and WV still energized. Average harvest cycle at factory setting is 2 to 3 minutes. How long does initial harvest last? 1.5 minutes after initial harvest begins, touch Comp discharge line. Is it hot? If not, check refrigerant pressures and Comp operation. If it is hot, touch the inlet line to the evaporator. Is it hot? If it is hot and the freeze cycle is not starting, check the harvest timer adjustment (S4 dip switch 1 & 2), the thermistor for open circuit, the discharge line temperature, Comp efficiency, and if HGV is fully open. For a thermistor check, see "IV.E. Thermistor Check." If 1-minute ll cycle starts after harvest, check that F/S is clean and operating properly, see "IV.D. Float Switch Check and Cleaning." Make sure PM does not come on last 50 seconds of harvest. For details, see "II.C.3.e) Bin Control Selector/Harvest Pump Timer (S4 Dip Switch 7)."

Page 52

5) Freeze Cycle – LED 1 is on. Comp and FMR remain energized, PM, LLV, and FM energize. WV and HGV de-energize. The unit is held in freeze by a 5-minute short cycle protection timer (CB will not accept a signal from F/S). After the 5-minute short cycle protection timer expires, CB turns freeze termination over to F/S. Diagnosis: During the rst 5 minutes of freeze, conrm that the evaporator temperature drops. After 5 minutes in freeze, disconnect black F/S connector from CB BLACK K5 connector. If the evaporator is not cold, check to see if HGV is still open or if TXV is not opening properly, if WV is continuing to ll the reservoir, if there are improper unit pressures, an inoperative Comp, or an inoperative HM. The unit should switch out of the freeze cycle ("G" CB - 15 second delay after F/S opens before terminating the freeze cycle). If the unit switches out of freeze with F/S removed, but would previously not switch out of freeze with F/S connected (long freeze - 3 beep alarm), F/S may be sticking. To check and clean F/S, see "IV.D. Float Switch Check and Cleaning." If the unit remains in freeze (longer than 15 seconds on "G" CB) after disconnecting the black F/S connector, replace CB. See "V.P. Removal and Replacement of Control Board." Note: Normal freeze cycle will last 20 to 40 minutes depending on model and

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

6) Pump-Out Cycle – (10/20 second pump-out) – 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 for 10/20 seconds depending on pump-out timer S4 dip switch 3 & 4 setting. When the pump-out timer expires, the pump-out is complete. The pump-out frequency control is factory set for every 10th cycle, 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)."

Timing of the rst pump-out is dependent on CB. "E" CB rst pump-out is after the rst freeze cycle. "G" CB rst pump-out is determined by S4 dip switch 5 & 6. See the table below.

"E" & "G" Control Board Settings 1st Pump-Out

S4 Dip Switch Setting

No. 5 No. 6

OFF OFF Every cycle After 1st freeze 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

"E" Control Board "G" Control Board

Diagnosis: If PM does not reverse, check to see if S4 and S5 dip switch settings are in

the factory default position. Check PM circuit and capacitor, check #5 pin (DBu wire) on CB K1 ten-pin connector for voltage. If water does not pump out, check and clean the check valve assembly and tubing.

Page 53

7) Normal Harvest Cycle – same as the initial harvest cycle – See "IV.A.4) Initial Harvest Cycle."

8) Shutdown

a) Thermostatic Bin Control: Auxiliary Code T-0, U-0

When the unit is running hold ice in contact with the thermostatic bulb, TBC switch opens within 10 seconds, shutting down the unit. 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. Diagnosis: See "IV.C.1. Thermostatic Bin Control

Check."

b) Mechanical Bin Control: Auxiliary Code U-1 and Later

See "IV.C.2.a) Mechanical Bin Control Check."

Legend: CB–control board; Comp–compressor; FM–fan motor; FMR–fan motor-remote;

F/S–oat switch; HGV–hot gas valve; HM–headmaster (C.P.R.); L LV –liquid line valve; MBC–mechanical bin control; PM–pump motor; TBC–thermostatic bin control; TXV–thermostatic expansion valve; WV–inlet water valve

B. Control Board Check

Before replacing a control board that does not show a visible defect and that you suspect is bad, always conduct the following check procedure. This procedure will help you verify your diagnosis.

Alarm Reset: If the control board is in alarm (beeping), press the "ALARM RESET"

button on the control board with power on. Once reset, the unit starts at the 1-minute ll cycle. For audible alarm information, see "II.C.2.f) LED Lights and Audible Alarm Safeties."

1) Check the dip switch settings to assure that S4 dip switch 3, 4, 7, 8, 9, & 10 and S5 dip switch 1 through 5 ("G" control board) are in the factory default position. S4 dip switch 1, 2, 5, & 6 are cleaning adjustments and the settings are exible. For factory default settings, see "II.C.3.a) Default Dip Switch Settings."

2) Move the control switch to the "ICE" position. If the red "POWER OK" LED is on, the control voltage is good. If the "POWER OK" LED is off, check the control transformer secondary circuit. The control transformer secondary circuit includes the cleaning valve interlock switch. Make sure the interlock switch is closed; otherwise, no control voltage is supplied to the K2 connector. Transformer output is 10.5V at 115V primary input. If the secondary circuit has proper voltage and the red LED is off, the control board is bad and should be replaced. See "V.P. Removal and Replacement of Control Board."

If the secondary circuit does not have proper voltage, check the control transformer

primary circuit. Check for 115V at the control board K1 ten-pin connector. Check the #10 pin (BR wire) to a white neutral wire for 115V. Always choose a white neutral wire to establish a good neutral connection when checking voltages. For additional checks, see "IV.F.1.[1] The icemaker will not start."

Page 54

3) The "OUTPUT TEST" button provides a relay sequence test. Make sure the control switch is in the "ICE" position, then press the "OUTPUT TEST" button. For the correct lighting sequence, see the table below. Note that the order of the LEDs from the outer edge of the control board is 1, 4, 3, 2. Components (e.g., compressor) cycle during the test.

Control

Board

"E" 2, 3, 4, 1

"G" 1, 4, 3, 2

Correct LED

Lighting Sequence

Following the test, the icemaker resumes operation. If the LEDs do not light as described above, the control board is bad and should be replaced. See "V.P. Removal and Replacement of Control Board."

4) To verify voltage output from the control board to the components, slide the control board K1 ten-pin connector out far enough to allow multimeter lead contact. With the unit in the cycle to be tested, check output voltage from the corresponding pin on the control board K1 ten-pin connector to ground. If output voltage is not found and the appropriate LED is on, the control board is bad and should be replaced. See "V.P. Removal and Replacement of Control Board."

C. Bin Control Check

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

To check the thermostatic bin control, follow the steps below.

CAUTION

The thermostatic bin control is factory set, and generally no adjustment is required. However, adjustment may be needed in some conditions, particularly at higher altitude locations.

1) Turn off the power supply.

2) Remove the front panel, then remove the control box cover.

3) Disconnect the thermostatic bin control wires from the thermostatic bin control switch.

4) Clear any ice away from the thermostatic bulb, then hold your hand around the thermostatic bulb to warm it up.

5) Check for continuity across the thermostatic bin control switch. If closed, continue to step 6. If open, adjust or replace the thermostatic bin control.

6) With the multimeter test leads still in place, hold ice on the thermostatic bulb to lower the temperature. Within 10 seconds, the thermostatic bin control switch should open (no continuity). If it remains closed, adjust or replace the thermostatic bin control.

Page 55

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

a) Mechanical Bin Control Check

To check the mechanical bin control switch, follow the steps below.

1) Turn off the power supply.

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

3) Remove the control box cover, then clear any ice away from the mechanical bin control.

4) Disconnect the red connector from the control board RED K4 connector.

5) Check for continuity across the wires of the red connector. See Fig. 1. When the actuator paddle is not engaged, the mechanical bin control switch is closed. If open, check that the white harness connector is secured to the mechanical bin control switch connector and that the actuator paddle is not sticking. Clean if necessary. See "IV. C.2.b) Mechanical Bin Control Cleaning." See Fig. 1. If the mechanical bin control switch still reads open, replace the mechanical bin control.

6) Press the actuator paddle, check for continuity across the wires of the red connector. When the actuator paddle is engaged, the mechanical bin control switch is open. If closed, check that the actuator paddle is not restricted. Clean if necessary. See "IV. C.2.b) Mechanical Bin Control Cleaning." If the mechanical bin control switch still reads closed, replace the mechanical bin control.

7) Reconnect the red connector, then move the control switch to the "ICE" position. Turn on the power supply.

8) Check that the green "BC CLOSED" LED on the control board is on.

9) Allow the unit to cycle on. Following the chart below, press and hold the actuator paddle. The yellow "BC OPEN" LED should be on and the unit should shut down according to the chart below. If it does not, replace the control board. See "V.P. Removal and Replacement of Control Board."

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.

Page 56

b) Mechanical Bin Control Cleaning

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

WARNING

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

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

1) Turn off the power supply.

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

3) Clear any ice away from the mechanical bin control.

4) Disconnect the mechanical bin control switch connector, then remove the mechanical bin control assembly from the unit.

5) Remove the actuator paddle from the switch mount. See Fig. 1.

6) Wipe down the mechanical bin control assembly with a mixture of 1 part of recommended cleaner Hoshizaki "Scale Away" or "LIME-A-WAY" (Economics Laboratory, Inc.) and 25 parts of warm water. Rinse the parts thoroughly with clean water.

7) Reassemble the mechanical bin control assembly and replace it in its correct position. Note: If the magnet was removed for cleaning, be sure to replace it in its correct

position.

8) Reconnect the mechanical bin control switch connector.

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

10) Replace the base cover and front panel in their correct positions.

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

Red Connector

Mechanical Bin Control Bracket

Switch Mount

Actuator Paddle

White Harness Connector

Mechanical Switch Connector

Bin Control

Magnet

Fig. 1

Page 57

D. Float Switch Check and Cleaning

1. Float Switch Check

To check the oat switch, follow the steps below.

1) Turn off the power supply.

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

3) Remove the base cover, then disconnect one end of the pump tubing to drain the water tank. See Fig. 2. After the water tank has drained, reconnect the pump tubing.

4) Remove the control box cover.

5) Disconnect the black oat switch connector from the control board BLACK K5 connector.

6) Check for continuity across the oat switch leads. With the water tank empty, the oat switch should be open. If open, continue to step 7. If closed, follow the steps in "IV. D.2. Float Switch Cleaning." After cleaning the oat switch, check it again. Replace if necessary.

Disconnect This End of Pump Tubing to Drain Water Tank

7) Reconnect the black oat switch connector, then replace the control box cover in its

Base Cover

Fig. 2

correct position.

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

9) Turn off the power supply.

10) Remove the front panel.

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

12) Remove the control box cover.

13) Disconnect the black oat switch connector from the control board BLACK K5 connector.

14) Check for continuity across the oat switch leads. With the water tank full, the oat switch should be closed. If the oat switch is closed and the icemaker will not switch from the 1-minute ll cycle to the initial harvest cycle, replace the control board. See "V.P. Removal and Replacement of Control Board."

If the oat switch is open, conrm that the water tank is full. If the tank is not full, check the water supply, water lters, and inlet water valve. If the tank is full, follow the steps in "IV.D.2. Float Switch Cleaning." After cleaning the oat switch, check it again. Replace if necessary.

Page 58

2. Float Switch Cleaning

Depending on local water conditions, scale may build up on the oat switch. Scale on the switch can cause the oat to stick. In this case, the oat switch should be cleaned.

1) Turn off the power supply.

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

3) Remove the base cover, then disconnect one end of the pump tubing to drain the water tank. See Fig. 2. After the water tank has drained, reconnect the pump tubing.

4) Disconnect the vent tube and the ush tube from the top of the oat switch, then remove the oat switch assembly and remove the oat switch assembly and remove the rubber boot from the bottom of the oat switch assembly. See Fig. 3.

5) Remove the retainer rod from the bottom of the oat switch housing, then remove the oat. Be careful not to bend the retainer rod excessively when removing it.

6) Wipe down the oat switch housing, shaft, oat, and retainer rod with a mixture of 1 part of recommended cleaner Hoshizaki "Scale Away" or "LIME-A-WAY" (Economics Laboratory, Inc.) and 25 parts of warm water. Clean the inside of the rubber boot and hose with cleaning solution. Rinse the parts thoroughly with clean water.

7) Reassemble the oat switch assembly and replace it and the rubber boot in their correct positions. Reconnect the vent tube and the ush tube.

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

9) Replace the front panel in its correct position.

Fig. 3

Vent

Flush

Shaft

Float Switch Housing

Float

Retainer Rod

Rubber Boot and Hose

Page 59

E. Thermistor Check

To check thermistor resistance, follow the steps below.

1) Turn off the power supply.

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

3) Remove the control box cover.

4) Remove the thermistor. See "V.L. Removal and Replacement of Thermistor."

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

6) Remove the white thermistor connector from the control board WHITE K3 connector and check the resistance between thermistor leads. Normal reading is within 4.7 to

6.2 kΩ. If outside the normal reading, replace the thermistor. If inside the normal reading, continue to the next step.

7) Replace the thermistor in its correct position. See "V.L. Removal and Replacement of Thermistor."

8) Reconnect the white thermistor connector to the control board WHITE K3 connector.

9) Replace the control box cover in its correct position, then turn on the power supply.

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

11) Once the harvest cycle starts, begin timing the harvest cycle.

12) The harvest timer should expire and terminate the harvest cycle within 2 to 3 minutes. If the harvest timer does not expire and terminate the harvest cycle, the harvest timer is bad and the control board should be replaced. See "V.P. Removal and Replacement of Control Board."

Page 60

F. Diagnostic Charts

1. No Ice Production

Problem Possible Cause Remedy

[1] The icemaker will not

start.

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

tripped breaker.

2. Loose connection. 2. Tighten.

3. Bad contacts. 3. Check for continuity and

4. Not within specications.

b) Transformer (115V

primary) (3 phase only)

c) Water Supply 1. Water supply off or

d) Thermostatic Bin

Control

e) Fuse (Control Box) 1. Blown. 1. Check for short circuit and

f) Control Switch 1. "OFF" or "WASH"

g) High Pressure Control 1. Bad contacts. 1. Check for continuity and

1. Voltage tap switch does not match incoming voltage.

2. Coil winding open or shorted.

pressure too low.

1. Tripped with bin lled with ice.

2. Ambient temperature too cool.

3. Set too warm. 3. See "IV.C.1. Thermostatic

4. Bulb out of position. 4. Place in position.

5. Bad contacts. 5. Check for continuity and

position.

2. Bad contacts. 2. Check for continuity and

2. Dirty air lter or condenser.

3. Ambient or condenser water temperature too warm.

4. Refrigerant overcharged.

5. Fan not operating (except water-cooled model).

6. Refrigerant lines or components restricted.

7. Condenser water pressure too low or off (water-cooled model).

1. Turn on, replace, or reset.

replace.

4. Refer to nameplate and correct.

1. Verify incoming voltage, move switch to proper setting.

2. Replace.

1. Check and get recommended pressure.

1. Remove ice.

2. Increase ambient temperature.

Bin Control Check."

replace.

1. Move to "ICE" position.

replace.

2. Clean.

3. Reduce temperature.

4. Recover, evacuate, and recharge.

5. See chart 1.[7].

6. Recover, repair, replace drier, evacuate and recharge.

7. Check and get recommended pressure.

Page 61

Problem Possible Cause Remedy

[1] The icemaker will not

start. (continued)

[2] Fill cycle will not

terminate.

h) Transformer 1. Coil winding open or

shorted.

i) Wiring to Control Board 1. Loose connections or

open.

j) Interlock Switch

(Cleaning Valve)

k) Mechanical Bin Control 1. Movement restricted. 1. Check and free.

l) Thermistor 1. Leads shorted or open

m)Hot Gas Valve 1. Continues to open

n) Inlet Water Valve 1. Mesh lter or orice

o) Float Switch 1. Bad contacts. 1. Check for continuity and

p) Control Board 1. Defective or in alarm. 1. See "IV.B. Control Board

a) Water Supply 1. Water supply off or

b) Float Switch 1. Connector

c) Control Board 1. Defective. 1. See "IV.B. Control Board

1. Open position. 1. Move to closed position.

2. Bad contacts. 2. Check for continuity and

2. Defective 2. See "IV.C.2. Mechanical

and high temperature or harvest backup timer safety operates (1 beep or 2 beep alarm).

in freeze cycle and freeze timer safety operates (3 beep alarm).

gets clogged and water supply cycle does not nish.

2. Coil winding open. 2. Replace.

3. Wiring to inlet water valve.

2. Defective switch. 2. Clean or replace. See "IV.

pressure too low.

disconnected.

2. Float does not move freely or switch defective switch.

1. Replace.

1. Check for continuity and replace.

replace.

Bin Control Check and Cleaning."

1. See "IV.E. Thermistor Check."

1. Check for hot gas valve stuck open and replace.

1. Clean.

3. Check for loose connection or open, and replace.

replace.

D. Float Switch Check and Cleaning."

Check."

1. Check and get recommended pressure.

1. Reconnect.

2. Clean or replace. See "IV. D. Float Switch Check and Cleaning."

Check."

Page 62

Problem Possible Cause Remedy

[3] Compressor will

not start or stops operating.

[4] Water continues to

be supplied in freeze cycle.

[5] Pump motor will not

start.

[6] Freeze cycle time is

too short.

a) Magnetic Contactor 1. Bad contacts. 1. Check for continuity and

replace.

2. Coil winding open. 2. Replace.

b) Start Capacitor or Run

Capacitor

c) Internal Overload

Protector Open (check 1 through 3 to the right and d through f below)

d) Starter 1. Bad contacts. 1. Check and replace.

e) Compressor 1. Power supply not

f) Control Board 1. No power to contactor. 1. See "IV.B. Control Board

a) Water Pressure 1. Too high. 1. Reduce.

b) Inlet Water Valve 1. Diaphragm does not

c) Control Board 1. Defective. 1. See "IV.B. Control Board

a) Pump Motor 1. Motor winding open. 1. Replace.

b) Control Board 1. Defective. 1. See "IV.B. Control Board

c) Control Switch 1. Bad contacts. 1. Replace.

a) Pump-Out Check Valve 1. Leaking by. 1. Clean or replace.

b) Float Switch 1. Dirty or erratic

c) Control Board 1. Defective. 1. See "IV.B. Control Board

d) Water System 1. Water leaks. 1. Check connections for

1. Defective. 1. Replace.

1. Loose terminal. 1. Tighten or replace.

2. Voltage. 2. Check and correct.

3. Dirty condenser. 3. Clean.

2. Coil winding open. 2. Replace.

1. Refer to nameplate and

within specications.

2. Wiring to compressor. 2. Check for loose connection

3. Defective. 3. Replace.

4. Protector tripped. 4. Reduce temperature.

close.

2. Bearing worn out. 2. Replace.

3. Wiring to pump motor. 3. Check for loose connection

4. Defective capacitor. 4. Replace.

5. Defective or bound impeller.

6. Mechanical seal worn out.

operation.

correct.

or open, and replace.

Check."

1. Check for water leaks with icemaker off.

Check."

or open, and replace.

5. Replace and clean.

6. Check and replace.

Check."

1. Clean or replace. See "IV. D. Float Switch Check and Cleaning."

Check."

water leaks and repair.

Page 63

Problem Possible Cause Remedy

[7] Fan motor will

not start, or is not operating (except water-cooled model).

[8] All components

run, but no ice is produced.

a) Fan Motor 1. Motor winding open. 1. Replace.

2. Bearing worn out. 2. Replace.

3. Wiring to fan motor. 3. Check for loose connection or open, and replace.

4. Defective capacitor. 4. Replace.

5. Fan blade bound. 5. Check and replace.

b) Control Board 1. Defective. 1. See "IV.B. Control Board

Check."

a) Refrigerant 1. Low charge. 1. Check for leaks. Recover,

repair, evacuate, and recharge.

2. Air or moisture

trapped.

b) Compressor 1. Defective. 1. Replace.

c) Hot Gas Valve 1. Continues to open in

freeze cycle.

d) Liquid Line Valve

(if applicable)

e) Inlet Water Valve 1. Inlet water valve is

f) Expansion Valve 1. Bulb loose. 1. Secure bulb.

g) Headmaster (C.P.R.)

(remote condenser unit)

h) Water Supply Line

(water-cooled model)

i) Water Regulating Valve

(water-cooled model)

1. Continues to close in

freeze cycle.

wide open during freeze.

2. Operating erratically. 2. Check and replace.

1. Not operating properly

and liquid line temperature too warm.

1. Condenser water

pressure too low or off and high pressure control opens and closes frequently.

1. Set too high. 1. Adjust or replace. See

2. Recover, replace drier, evacuate, and recharge.

1. Check and replace.

1. Check for water leaks with icemaker off.

1. Replace headmaster.

1. Check and get recommended pressure.

"V.J. Adjustment of Water Regulating Valve."

2. Evaporator is Frozen Up

Problem Possible Cause Remedy

[1]Freeze cycle time is

too long.

a) Inlet Water Valve 1. Diaphragm does not

close.

b) Float Switch 1. Float does not move

freely or defective switch.

c) Evaporator 1. Scaled up. 1. Clean.

2. Damaged. 2. Replace.

d) Spray Tubes 1. Dirty. 1. Clean.

2. Out of position. 2. Place in position.

e) Pump Motor 1. RPM too slow. 1. See chart 1.[5].

1. Check for water leaks with icemaker off.

1. Clean or replace. See "IV. D. Float Switch Check and Cleaning."

Page 64

Problem Possible Cause Remedy

[1]Freeze cycle time is

too long. (continued)

[2]All ice formed on

evaporator does not fall into bin in harvest cycle.

f) Thermistor 1. Disconnected, loose,

or defective.

g) Refrigerant 1. Low charge. 1. Check for leaks. Recover,

h) Expansion Valve 1. Bulb loose. 1. Secure bulb.

2. Operating erratically. 2. Check and replace.

i) Control Board 1. Defective. 1. See "IV.B. Control Board

a) Evaporator 1. Scaled up. 1. Clean.

2. Damaged. 2. Replace.

b) Ambient and/or Water

Temperature

c) Water Supply Line 1. Water pressure too

d) Water System 1. Water supply line

e) Inlet Water Valve 1. Dirty mesh lter or

f) Spray Tubes 1. Dirty. 1. Clean.

g) Thermistor 1. Disconnected, loose,

h) Hot Gas Valve 1. Coil winding open. 1. Replace.

i) Expansion Valve 1. Bulb loose. 1. Secure bulb.

j) Liquid Line Valve

(if applicable)

k) Control Board 1. Harvest timer is set

1. Too cool. 1. Increase temperature.

low.

too small; requires 3/8" OD line dedicated per machine.

2. Water lter clogged or ow rate too small.

orice.

2. Diaphragm does not close.

2. Out of position. 2. Place in position.

or defective.

2. Plunger does not move.

3. Wiring to hot gas valve.

2. Operating erratically. 2. Check and replace.

1. Continues to open in harvest cycle.

too short.

2. Defective. 2. See "IV.B. Control Board

1. Connect, secure, check. See "V.L. Removal and Replacement of Thermistor."

repair, evacuate, and recharge.

Check."

1. Check and get recommended pressure.

1. Increase water line size.

2. Replace lter or install a higher ow rate lter.

1. Clean.

2. Check for water leaks with icemaker off.

1. Connect, secure, check. See "V.L. Removal and Replacement of Thermistor."

2. Replace.

3. Check for loose connection or open, and replace.

1. Check operation in harvest cycle and replace.

1. Adjust longer, referring to "II.C.3.b) Harvest Timer (S4 dip switch 1 & 2)."

Check."

Page 65

Problem Possible Cause Remedy

[2]All ice formed on

evaporator does not fall into bin in harvest cycle. (continued)

[3]Other. a) Ice Cube Guide 1. Out of position. 1. Place in position.

l) Refrigerant 1. Low charge. 1. Check for leaks. Recover,

repair, evacuate, and recharge.

m)Water Regulating Valve

(water-cooled model)

b) Thermostatic Bin

Control

c) Mechanical Bin Control 1. Movement restricted. 1. Check and free.

1. Leaking by in harvest. 1. Check and replace.

1. Bulb out of position. 1. Place in position.

2. Bad contacts. 2. Check for continuity and replace. See "IV.C.1. Thermostatic Bin Control Check."

2. Defective. 2. See "IV.C.2. Mechanical Bin Control Check and Cleaning."

3. Low Ice Production

Problem Possible Cause Remedy

[1] Freeze cycle time is

long.

a) Inlet Water Valve 1. Diaphragm does not

close.

b) Float Switch 1. Float switch does not

move freely or switch defective.

c) Evaporator 1. Scaled up. 1. Clean.

2. Damaged. 2. Replace.

d) Spray Tubes 1. Dirty. 1. Clean.

2. Out of position. 2. Place in position.

e) Pump Motor 1. RPM too slow. 1. See chart 1.[5].

f) Condenser (except

water-cooled model)

g) Refrigerant Charge 1. Low charge. 1. Check for leaks. Recover,

h) Hot Gas Valve 1. Open. 1. Check and replace.

i) Expansion Valve 1. Bulb loose. 1. Secure bulb.

j) Compressor 1. Erratic or off. 1. See chart 1.[3].

k) Condenser Water

(water-cooled model)

l) Liquid Line Valve 1. Erratic, sticking. 1. Check and replace.

m)Headmaster (C.P.R.)

(remote condenser unit)

1. Air lter or condenser clogged.

2. Operating erratically. 2. Check and replace.

1. Water regulating valve set too high.

2. Condenser water pressure too low.

3. Water temperature out of specication.

1. Bypassing. 1. Replace.

1. Check for water leaks with icemaker off.

1. Clean or replace. See "IV. D. Float Switch Check and Cleaning."

1. Clean.

repair, evacuate, and recharge.

1. Adjust or replace. See "V.J. Adjustment of Water Regulating Valve."

2. Check and get recommended pressure.

3. Correct to specication.

Page 66

Problem Possible Cause Remedy

[1] Freeze cycle time is

long. (continued)

[2] Harvest cycle time is

long.

n) Control Board 1. Float switch

connection loose (K5).

2. Defective. 2. See "IV.B. Control Board

a) Water Supply 1. Water temperature too

cold.

b) Thermistor 1. Disconnected, loose,

or defective.

c) Control Board 1. Not reading

thermistor.

2. Sending voltage to liquid line valve (if applicable) in harvest.

d) Inlet Water Valve 1. Clogged. 1. Clean or replace.

e) Evaporator 1. Scaled up. 1. Clean.

2. Damaged. 2. Replace.

f) Hot Gas Valve 1. Does not open, or

opens partially.

g) Expansion Valve 1. Wide open in harvest. 1. Check and replace.

2. Bulb loose. 2. Secure bulb.

h) Water Regulating Valve

(water-cooled model)

i) Liquid Line Valve (if

applicable)

1. Open during harvest. 1. Adjust or replace. See

1. Open during harvest cycle.

1. Check and reconnect.

Check."

1. Increase temperature.

1. Connect, secure, check. See "V.L. Removal and Replacement of Thermistor" and "IV.E. Thermistor Check."

1. Check and replace. See "IV.E. Thermistor Check."

2. Check and replace. See "IV.B. Control Board Check."

1. Check and replace.

"V.J. Adjustment of Water Regulating Valve."

1. Check and replace.

4. Abnormal Ice

Problem Possible Cause Remedy

[1] Small cubes. a) Pump-Out Check Valve 1. Dirty or worn and

leaking by.

b) Ice Cube Guide 1. Out of position.

Circulated water falls into bin.

c) Water System 1. Water supply line too

small; requires 3/8" OD line dedicated per machine.

2. Water lter clogged or ow rate too small.

d) Inlet Water Valve 1. Dirty mesh lter or

orice.

e) Pump Motor 1. RPM too slow. 1. See chart 1.[5].

f) Control Board 1. Defective. 1. See "IV.B. Control Board

1. Clean or replace.

1. Place in position.

1. Increase water line size.

2. Replace lter or install a higher ow rate lter.

1. Clean.

Check."

Page 67

Problem Possible Cause Remedy

[2] Cloudy or irregular

cubes.

a) Evaporator 1. Frozen up. 1. See chart 2.

2. Scaled up. 2. Clean

3. Damaged. 3. Replace.

b) Water System 1. Water supply line too

small; requires 3/8" OD line dedicated per machine.

2. Water lter clogged or ow rate too small.

3. High hardness or contains impurities.

c) Spray Guide 1. Dirty. 1. Clean.

1. Increase water line size.

2. Replace lter or install a higher ow rate lter.

3. Install a water softener or lter.

5. Other

Problem Possible Cause Remedy

[1] Icemaker will not stop

when bin is lled with ice.

[2] Abnormal noise. a) Pump Motor 1. Bearings worn out. 1. Replace.

[3] Ice in storage bin

often melts.

a) Thermostatic Bin

Control

b) Mechanical Bin Control 1. Movement restricted. 1. Check and free.

c) Control Board ("G"

control board with mechanical bin control)

b) Fan Motor (except

water-cooled model)

c) Compressor 1. Bearings worn out or

d) Refrigerant Lines 1. Rub or touch other

a) Drain Line(s) 1. Plugged. 1. Clean.

b) Icemaker and Bin 1. Drains not run

c) Ice Cube Guide 1. Out of position.

1. Set too cold. 1. See "IV.C.1. Thermostatic Bin Control Check."

2. Defective. 2. Replace.

2. Loose connection. 2. Check and reconnect.

3. Defective 3. See "IV.C.2. Mechanical Bin Control Check and Cleaning."

1. Defective. 1. See "IV.B. Control Board Check."

1. Bearings worn out. 1. Replace.

2. Fan blade deformed. 2. Replace.

3. Fan blade does not

move freely.

cylinder valve broken.

2. Mounting pad out of

position.

lines or surfaces.

separately.

Circulated water falls into bin.

3. Replace.

1. Replace.

2. Reinstall.

1. Reposition.

1. Separate the drain lines.

1. Place in position.

Page 68

V. Removal and Replacement of Components

WARNING

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

2. Move the control switch to the "OFF" position and turn off the power supply before servicing.

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

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

A. Service for Refrigerant Lines

WARNING

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

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

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

CAUTION

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

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

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

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

1. Refrigerant Recovery

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

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2. Brazing

WARNING

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

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

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

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

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

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

CAUTION

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

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

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

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

3. Evacuation and Recharge (R-404A)

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

IMPORTANT

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

2) Turn on the vacuum pump. Open the gauge manifold valves. Never allow the oil in the vacuum pump to ow backwards.

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

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

5) Disconnect the gauge manifold hose from the vacuum pump and attach it to a refrigerant service cylinder. Remember to loosen the connection and purge the air from the hose. For air-cooled and water-cooled models, see the nameplate for the required refrigerant charge. For remote air-cooled models, see the rating label inside the icemaker. Hoshizaki recommends only virgin refrigerant or reclaimed refrigerant which meets ARI Standard 700 (latest edition) be used.

6) A liquid charge is recommended for charging an R-404A system. Invert the service cylinder and place it on scales. Open the high-side valve on the gauge manifold.

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

8) If necessary, add any remaining charge to the system through the low-side. Use a throttling valve or liquid dispensing device to add the remaining liquid charge through the low-side access valve with the unit running.

9) Close the gauge manifold valves and disconnect the gauge manifold hoses.

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

B. Removal and Replacement of Compressor

CAUTION

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

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

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

Note: When replacing a compressor with a defective winding, be sure to install the

new start capacitor and start relay supplied with the replacement compressor. Due to the ability of the POE oil in the compressor to absorb moisture quickly, the compressor must not be opened more than 15 minutes for replacement or service. Do not mix lubricants of different compressors even if both are charged with R-404A, except when they use the same lubricant.

1) Turn off the power supply.

2) Remove the panels.

3) Recover the refrigerant and store it in an approved container.

4) Remove the terminal cover on the compressor and disconnect the compressor wiring. On remote air-cooled models, disconnect the crankcase heater.

5) Remove the discharge, suction, and process pipes.

6) Remove the hold-down bolts, washers, and rubber grommets.

7) Remove the compressor. Unpack the new compressor package.

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8) Attach the rubber grommets of the prior compressor to the new compressor.

9) Place the compressor in position and secure it using the bolts and washers.

10) Remove the drier, then place the new drier in position.

11) Remove the plugs from the suction, discharge, and process pipes.

12) Braze all ttings while purging with nitrogen gas owing at a pressure of 3 to 4 PSIG.

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

14) Evacuate the system and charge it with refrigerant. For air-cooled and water-cooled models, see the nameplate for the required refrigerant charge. For remote air-cooled models, see the rating label inside the icemaker.

15) Connect the terminals and replace the terminal cover in its correct position. On remote air-cooled models, connect the crankcase heater.

16) Replace the panels in their correct positions.

17) Turn on the power supply.

C. Removal and Replacement of Expansion Valve

Moisture in the refrigeration circuit may exceed drier capacity and freeze up at the expansion valve.

CAUTION

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

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

3. When brazing, protect the valve body and drier by using wet cloths to prevent the valve body and drier from overheating. Do not allow the valve body or drier to exceed 250°F (121°C).

1) Turn off the power supply.

2) Remove the panels.

3) Recover the refrigerant and store it in an approved container.

4) Remove the insulation and the expansion valve bulb on the suction line.

5) Remove the expansion valve cover and disconnect the expansion valve. Place the new expansion valve in position.

6) Remove the drier, then place the new drier in position.

7) Braze all ttings while purging with nitrogen gas owing at a pressure of 3 to 4 PSIG.

Page 72

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

9) Evacuate the system, and charge it with refrigerant. For air-cooled and water-cooled models, see the nameplate for the required refrigerant charge. For remote air-cooled models, see the rating label inside the icemaker.

10) Attach the expansion valve bulb to the suction line in the same location as the previous bulb. The bulb should be between the 10 and 2 o'clock position on the tube. Be sure to secure the bulb with the clamp and holder and to insulate it.

11) Place the expansion valve cover in position.

12) Replace the panels in their correct positions.

13) Turn on the power supply.

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

CAUTION

1. Always use a copper tube of the same diameter and length when replacing the valve lines; otherwise, performance may be affected.

2. Always replace the strainer when replacing the hot gas valve.

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

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

5. When brazing, protect the valve body and drier by using wet cloths to prevent the valve body and drier from overheating. Do not allow the valve body or drier to exceed 250°F (121°C).

1) Turn off the power supply.

2) Remove the panels.

3) Recover the refrigerant and store it in an approved container.

4) Remove the bolt and the solenoid.

5) Disconnect the valve. If replacing the hot gas valve, also remove the strainer.

6) Place the new valve and strainer (if applicable) in position.

7) Remove the drier, then place the new drier in position.

8) Braze all ttings while purging with nitrogen gas owing at a pressure of 3 to 4 PSIG.

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

Page 73

10) Evacuate the system, and charge it with refrigerant. For air-cooled and water-cooled models, see the nameplate for the required refrigerant charge. For remote air-cooled models, see the rating label inside the icemaker.

11) Replace the solenoid in its correct position.

12) Replace the panels in their correct positions.

13) Turn on the power supply.

E. Removal and Replacement of Evaporator

CAUTION

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

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

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

1) Turn off the power supply.

2) Remove the panels and the front and top insulation.

3) Recover the refrigerant and store it in an approved container.

4) Remove the spray tubes. Remove the insulation at the notch where the refrigeration tubing passes through the molded chassis.

5) Disconnect the evaporator tubing. Note: The pipes in the evaporator case are specially coated to resist corrosion. Use

sandpaper to remove the coating from the brazing connections before unbrazing.

6) Remove the pop rivets securing the evaporator, then lift out the evaporator.

7) Install the new evaporator.

8) Remove the drier, then place the new drier in position.

9) Braze all ttings while purging with nitrogen gas owing at a pressure of 3 to 4 PSIG.

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

11) Evacuate the system, and charge it with refrigerant. For air-cooled and water-cooled models, see the nameplate for the required refrigerant charge. For remote air-cooled models, see the rating label inside the icemaker.

12) Replace the removed parts in the reverse order of which they were removed.

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

14) Turn on the power supply.

Page 74

F. Removal and Replacement of Air-Cooled Condenser

CAUTION

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

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

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

1) Turn off the power supply.

2) Remove the panels.

3) Recover the refrigerant and store it in an approved container.

4) Disconnect the fan motor wiring harness. Remove the bolts securing the fan motor assembly to the oor of the machine, then remove the assembly.

5) Disconnect the condenser inlet and outlet piping.

6) Remove the screws securing the condenser assembly, then remove the assembly.

7) Remove the shroud from the old condenser and attach it to the new condenser.

8) Install the new condenser.

9) Remove the drier, then place the new drier in position.

10) Braze all ttings while purging with nitrogen gas owing at a pressure of 3 to 4 PSIG.

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

12) Evacuate the system, and charge it with refrigerant. See the nameplate for the required refrigerant charge.

13) Replace the removed parts in the reverse order of which they were removed.

14) Replace the panels in their correct positions.

15) Turn on the power supply.

Page 75

G. Removal and Replacement of Water-Cooled Condenser

CAUTION

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

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

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

1) Turn off the power supply.

2) Remove the panels.

3) Close the condenser water supply line shut-off valve. If connected to a closed loop water supply, also close the condenser return outlet shut-off valve.

4) Open the condenser water supply line drain valve. If connected to a closed loop water supply, also open the condenser return outlet drain valve.

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

6) Open the water regulating valve by using a screwdriver to pry up on the spring retainer underneath the spring. While holding the valve open, blow out the condenser using the compressed air or carbon dioxide supply until water stops coming out.

7) Recover the refrigerant and store it in an approved container.

8) Disconnect the condenser water inlet and outlet piping and the refrigeration inlet and outlet piping at the condenser.

9) Remove the old condenser and install the new condenser.

10) Remove the drier, then place the new drier in position.

11) Braze all ttings while purging with nitrogen gas owing at a pressure of 3 to 4 PSIG.

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

13) Evacuate the system, and charge it with refrigerant. See the nameplate for the required refrigerant charge.

14) Close the drain valve(s). Open the condenser water supply line shut-off valve. If connected to a closed loop water supply, also open the condenser return outlet shut-off valve.

15) Check for water leaks.

16) Replace the panels in their correct positions.

17) Turn on the power supply.

Page 76

H. Removal and Replacement of Remote Air-Cooled Condenser

CAUTION

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

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

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

1) Turn off the power supply.

2) Remove the icemaker panels.

3) Recover the refrigerant and store it in an approved container.

4) Remove the condenser unit panels.

5) Disconnect the condenser inlet and outlet piping.

6) Remove the screws securing the condenser to the base of the unit, then remove the condenser.

7) Remove the shroud from the condenser and attach to the new condenser.

8) Install the new condenser.

9) Remove the drier (located in the icemaker), then place the new drier in position.

10) Braze all ttings while purging with nitrogen gas owing at a pressure of 3 to 4 PSIG.

12) Evacuate the system, and charge it with refrigerant. See the rating label inside the icemaker for the required refrigerant charge.

13) Replace the panels in their correct positions.

14) Turn on the power supply.

Page 77

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

model)

CAUTION

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

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

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

1) Turn off the power supply.

2) Remove the panels.

3) Close the condenser water supply line shut-off valve. If connected to a closed loop water supply, also close the condenser return outlet shut-off valve.

4) Open the condenser water supply line drain valve. If connected to a closed loop water supply, also open the condenser return outlet drain valve.

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

7) Recover the refrigerant and store it in an approved container.

8) Disconnect the capillary tube at the condenser outlet.

9) Disconnect the are-connections of the valve.

10) Remove the screws and the valve from the bracket.

11) Install the new valve.

12) Remove the drier, then place the new drier in position.

13) Braze all ttings while purging with nitrogen gas owing at a pressure of 3 to 4 PSIG.

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

15) Evacuate the system, and charge it with refrigerant. See the nameplate for the required refrigerant charge.

16) Connect the are-connections.

17) Close the drain valve(s). Open the condenser water supply line shut-off valve. If connected to a closed loop water supply, also open the condenser return outlet shut-off valve.

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18) Check for water leaks.

19) Replace the panels in their correct positions.

20) Turn on the power supply.

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

The water regulating valve (also called "water regulator") is factory set, and generally no adjustment is required. However, when necessary, adjust the water regulator using the following procedures.

1) Prepare a thermometer to check the condenser drain temperature. Attach a pressure gauge to the high-side line of the system.

2) Five minutes after a freeze cycle starts, conrm that the thermometer reads 104°F to 115°F (40°C to 46°C). If it does not, rotate the adjustment screw by using a at blade screwdriver until the temperature is in the proper range. See Fig. 4. Next, check that the reference pressure is in the range indicated in the Head Pressure table in the Performance Data section. If it is not in the proper range, verify the refrigerant charge.

Top View

Fig. 4

Adjustment Screw

CW – Higher CCW – Lower

3) Check that the condenser drain temperature is stable.

K. Removal and Replacement of Headmaster (Condensing Pressure

Regulator - C.P.R.) (remote air-cooled model)

CAUTION

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

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

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

1) Turn off the power supply.

2) Remove the panels from the remote condenser unit.

3) Recover the refrigerant and store it in an approved container.

4) Before heating, break off the stub on the dome to release the dome charge.

5) Disconnect the headmaster.

6) Place the new headmaster in position.

7) Remove the drier, then place the new drier in position. 78

Page 79

8) Braze all ttings with nitrogen gas owing at a pressure of 3 to 4 PSIG.

10) Evacuate the system and charge it with refrigerant. See the rating label inside the icemaker, for the required refrigerant charge.

11) Replace the panels in their correct positions.

12) Turn on the power supply.

L. Removal and Replacement of Thermistor

This section covers removal and replacement of the thermistor. For a thermistor check procedure, see "IV.E. Thermistor Check."

CAUTION

1. The thermistor is fragile; handle very carefully.

2. Always use the recommended sealant (high thermal conductive type), Model KE4560RTV manufactured by SHINETSU SILICONE, Part Code 60Y000-11, or Part Code 4A0683-01 or equivalent.

3. Always use the recommended foam insulation (non-absorbent type) or equivalent.

4. Do not shorten or cut the thermistor leads.

1) Turn off the power supply.

2) Remove the panels.

3) Remove the control box cover.

4) Disconnect the white thermistor connector from the control board WHITE K3 connector.

5) Remove the plastic cable ties, foam insulation, thermistor holder, and thermistor. See Fig. 5.

6) Scrape away the old sealant on the thermistor holder and the suction pipe.

7) Wipe off moisture or condensation on the suction pipe.

8) Smoothly apply recommended sealant (KE4560RTV, Part Code 60Y000-11 or 4A0683-01) to the thermistor holder concave.

Thermistor Lead Cable Tie

Foam Insulation Thermistor Holder

Fig. 5

9) Attach the new thermistor to the suction pipe in the same position as the previous thermistor. Be very careful to prevent damage to the leads. Secure it using the thermistor holder and recommended foam insulation.

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10) Secure the insulation using plastic cable ties.

11) Connect the white thermistor connector through the bushing of the control box to the control board WHITE K3 connector. Note: Do not cut the leads of the thermistor.

12) Replace the control box cover and the panels in their correct positions.

13) Turn on the power supply.

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

air-cooled models)

Note: When replacing a fan motor with defective winding, it is recommended that a new

capacitor be installed.

1) Turn off the power supply.

2) Remove the panels.

3) Remote air-cooled model: remove the junction box cover from the remote condenser unit.

4) Disconnect the fan motor wires.

5) Remove the fan motor bracket and fan motor.

6) Install the new fan motor, connect the fan motor wires, and replace the removed parts in the reverse order of which they were removed.

7) Replace the panels in their correct positions.

8) Remote air-cooled model: replace the junction box cover in its correct position.

9) Turn on the power supply.

N. Removal and Replacement of Inlet Water Valve

1) Turn off the power supply.

2) Close the icemaker water supply line shut-off valve. Open the icemaker water supply line drain valve.

3) Remove the front panel.

4) Disconnect the valve outlet tubing by releasing the clamp.

5) Loosen the tting nut. Be careful not to lose the washer.

6) Disconnect the terminals from the inlet water valve.

7) Remove the bracket and valve from the unit.

8) Install the new valve. Replace the removed parts in the reverse order of which they were removed. Make sure the washer is in place in the tting nut.

9) Close the icemaker water supply line drain valve. Open the icemaker water supply line shut-off valve.

10) Turn on the power supply.

11) Check for leaks.

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12) Replace the front panel in its correct position.

13) Turn on the power supply.

O. Removal and Replacement of Pump Motor

1) Turn off the power supply.

2) Remove the front panel.

3) Remove the base cover, then disconnect one end of the pump tubing to drain the water tank. See Fig. 6. After the water tank has drained, reconnect the pump tubing.

5) Disconnect the pump suction and discharge hoses.

6) Remove the closed end connectors from the pump motor leads.

7) Remove the screw attaching the pump motor assembly to the base, then remove the pump motor assembly.

8) Remove the screw attaching the pump motor to the pump motor bracket.

9) Remove the screws attaching the pump housing to the pump motor. Remove the housing and check the impeller.

10) If the impeller is defective, install a new impeller.

11) Install the new motor or new parts, and replace the removed parts in the reverse order of which they were removed. Be sure to reattach the green ground wire.

12) Turn on the power supply and check for leaks.

13) Replace the base cover in its correct position.

14) Replace the front panel in its correct position.

Disconnect This End of Pump Tubing to Drain Water Tank

Base Cover

Fig. 6

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P. Removal and Replacement of Control Board

When replacing a control board follow the precautions below.

CAUTION

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

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

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

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

1) Turn off the power supply.

2) Remove the front panel and the control box cover.

3) Disconnect the control board connectors from the control board.

4) Remove the control board.

5) Adjust the dip switches on the new control board to the factory default settings. See "II. C.3.a) Default Dip Switch Settings." 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.

6) Install the new control board taking care not to damage it.

7) Connect the control board connectors to the new control board.

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

9) Turn on the power supply.

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VI. Cleaning and Maintenance

WARNING

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

securely in place after any cleaning or maintenance is done to the unit. Make sure that none have fallen into the storage bin.

A. Cleaning and Sanitizing Instructions

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

WARNING

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

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

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

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

IMPORTANT

1. The cleaning valve is opened during cleaning and sanitizing to allow solution ow to the inside of the evaporator. It should be closed for all icemaking operation. The compressor will not operate unless this valve is completely closed.

2. To close the cleaning valve, the valve handle should be at a right angle to the valve body. To open the cleaning valve, the valve handle should be parallel to the valve body.

CLOSED

Normal Icemaking Operation

Cleaning and Sanitizing Operation

(allows solution ow to the inside

OPEN

of the evaporator)

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1. Cleaning Procedure

1) Dilute 16 . oz. (473 ml) of Hoshizaki "Scale Away" with 3 gal. (11 l) of warm water.

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

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

3) Turn off the power supply.

4) Remove the front panel, then remove the

Disconnect This End of Pump Tubing to Drain Water Tank

insulation panel by lifting up the panel slightly and pulling it towards you.

5) Remove the base cover, then disconnect one end of the pump tubing to drain the water tank. See Fig. 7. After the water tank has drained, reconnect the pump tubing.

Base Cover

Fig. 7

6) In bad or severe water conditions, clean the oat switch assembly as described below. Otherwise, continue to step 7.

a. Disconnect the vent tube and the ush tube from the top of the oat switch, then

remove the oat switch assembly. Remove the rubber boot from the bottom of the assembly.

b. Remove the retainer rod from the bottom of the oat switch housing, then remove

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

c. Wipe down the oat switch assembly's housing, shaft, oat, and retainer rod with

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

d. Reassemble the oat switch assembly and replace it and the rubber boot in their

correct positions. Reconnect the vent tube and the ush tube.

7) Pour the cleaning solution into the water tank.

8) Fully open the cleaning valve on the left side wall of the machine compartment.

9) Move the control switch on the control box to the "WASH" position.

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

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

12) Turn off the power supply after 30 minutes.

13) Remove the front panel.

14) Disconnect one end of the pump tubing to drain the water tank. After the water tank has drained, reconnect the pump tubing.

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

16) Close the cleaning valve. Note: The icemaker will not operate unless the cleaning valve is completely closed.

17) Replace the front panel in its correct position.

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

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19) Turn off the power supply after 3 minutes.

20) Remove the front panel and fully open the cleaning valve.

21) Move the control switch to the "WASH" position.

22) Replace the front panel in its correct position.

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

24) Turn off the power supply after 5 minutes.

25) Remove the front panel.

26) Disconnect one end of the pump tubing to drain the water tank. After the water tank has drained, reconnect the pump tubing.

27) Repeat steps 15 through 26 three more times to rinse thoroughly. Note: If you do not sanitize the icemaker, go to step 10 in "2. Sanitizing Procedure."

2. Sanitizing Procedure - Following Cleaning Procedure

1) Dilute a 5.25% sodium hypochlorite solution (chlorine bleach) with warm water. (Add

1.5 . oz. (44 ml) of sanitizer to 3 gal. (11 l) of water.)

2) Remove the insulation panel.

3) Pour the sanitizing solution into the water tank.

4) Replace the insulation panel and the front panel in their correct positions. Note: Make sure that the control switch is in the "WASH" position and the cleaning

valve is open.

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

6) Turn off the power supply after 15 minutes.

7) Remove the front panel.

8) Disconnect one end of the pump tubing to drain the water tank. After the water tank has drained, reconnect the pump tubing.

9) Repeat steps 15 through 26 in "1. Cleaning Procedure" two times to rinse thoroughly.

10) Close the cleaning valve.

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

12) Replace the front panel and the base cover in their correct positions.

13) Clean the storage bin liner using a neutral cleaner. Rinse thoroughly after cleaning.

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

Page 86

B. Maintenance

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

WARNING

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

2. Disconnect power before performing service or maintenance.

1. Stainless Steel Exterior

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

2. Storage Bin and Scoop

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

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

•Cleanthescoopandthestoragebinlinerusinganeutralcleaner.Rinsethoroughly

after cleaning.

3. Air Filters (air-cooled model)

Plastic mesh air lters remove dirt and dust from the air, and keep the condenser from getting clogged. As the lters get clogged, the icemaker’s performance will be reduced. Check the lters at least twice a month. When they are clogged, use warm water and a neutral cleaner to wash the lters.

4. Condenser (air-cooled and remote air-cooled models)

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

C. Preparing the Icemaker for Long Storage

CAUTION

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

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

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

1. Remove the water from the icemaker water supply line:

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

2) Move the control switch on the control box to the "OFF" position.

3) Close the icemaker water supply line shut-off valve, then open the icemaker water supply line drain valve.

4) Allow the line to drain by gravity.

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

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

7) Replace the front panel in its correct position, then turn on the power supply.

8) Blow the icemaker water supply line out using the compressed air or carbon dioxide supply.

9) Close the icemaker water supply line drain valve.

2. Drain the water tank:

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

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

3) Remove the base cover, then disconnect one end of the pump tubing to drain the water tank. See Fig. 8. After the water tank has drained, reconnect the pump tubing.

4) Replace the base cover and the front panel in their correct positions.

5) Remove all ice from the storage bin. Clean the storage bin liner using a neutral cleaner. Rinse thoroughly after cleaning.

3. On water-cooled model, remove the water from the water-cooled condenser:

1) Make sure the power supply is off, then remove the front panel and right side panel.

2) Close the condenser water supply line shut-off valve. If connected to a closed loop system, also close the condenser return line shut-off valve.

3) Open the condenser water supply line drain valve. If connected to a closed loop system, also open the condenser return line drain valve.

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

5) Open the water regulating valve by using a screwdriver to pry up on the spring retainer underneath the spring. While holding the valve open, blow out the condenser using the compressed air or carbon dioxide supply until water stops coming out.

6) Close the drain valve(s).

7) Replace the right side panel and front panel in their correct positions.

Disconnect This End of Pump Tubing to Drain Water Tank

Base Cover

Fig. 8

Hoshizaki KM-901MWH User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Important Safety Information

A. Icemaker

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

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

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

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

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

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

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

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

B. Condenser Unit

1. URC-9F

II. General Information

A. Construction

1. KM-901MAH (air-cooled)

2. KM-901MWH (water-cooled)

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

B. Sequence of Operation

1. Sequence Cycles and Shutdown

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

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

2. Sequence Flow Chart

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

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

C. Control Board

1. Control Board Layout

2. Features

a) Maximum Water Supply Period - 6 minutes

b) Harvest Backup Timer and Freeze Timer

c) High Temperature Safety

d) Low Water Safety

e) High Voltage and Low Voltage Cut-outs

f) LED Lights and Audible Alarm Safeties

3. Controls and Adjustments

a) Default Dip Switch Settings

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

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

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

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

f) Factory Use (S4 dip switch 8)

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

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

D. Bin Control

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

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

E. Float Switch

F. Thermistor

G. Control Switch

III. Technical Information

A. Water Circuit and Refrigeration Circuit

1. KM-901MAH (air-cooled)

2. KM-901MWH (water-cooled)

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

B. Wiring Diagrams

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

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

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

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

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

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

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

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

C. Performance Data

1. KM-901MAH (air-cooled)

2. KM-901MWH (water-cooled)

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

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

IV. Service Diagnosis

A. Diagnostic Procedure

B. Control Board Check

C. Bin Control Check

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

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

a) Mechanical Bin Control Check

b) Mechanical Bin Control Cleaning

D. Float Switch Check and Cleaning