Hoshizaki America KMD-700MAH Service Manual

Reliability is a beautiful thing

MODULAR CRESCENT CUBER

KMD-700MAH KMD-700MWH KMD-700MRH

SERVICE MANUAL

KMD-900MAH KMD-900MWH KMD-900MRH

ITEM #: 73107

™

ISSUED: June 2, 2003

REVISED: July 28, 2006

IMPORTANT

Only qualified service technicians should attempt to service or maintain this icemaker. No service or maintenance should be undertaken until the technician has thoroughly read this Service Manual.

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

Should the reader have any questions or concerns which have not been satisfactorily addressed, please call or write 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 Service

(770) 487-2331

Fax: (770) 487-3360

Web Site: www.hoshizakiamerica.com

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

following information:

• Model Number

• Serial Number

•

Complete and detailed explanation of the problem

Please review this manual. It should be read carefully before the icemaker is serviced or maintenance operations are performed. Only qualified service technicians should service and maintain the icemaker. This manual should be made available to the technician prior to service or maintenance.

CONTENTS

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

1. KMD-700MAH .............................................................................................................. 5

2. KMD-700MWH ............................................................................................................. 6

3. KMD-700MRH .............................................................................................................. 7

4. KMD-900MAH .............................................................................................................. 8

5. KMD-900MWH ............................................................................................................. 9

6. KMD-900MRH ............................................................................................................ 10

7. Condensing Unit......................................................................................................... 11

URC-12F.................................................................................................................. 11

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

1. Construction ............................................................................................................... 13

[a] KMD-700MAH ..................................................................................................... 13

[b] KMD-700MWH .................................................................................................... 14

[c] KMD-700MRH ..................................................................................................... 15

[d] KMD-900MAH ..................................................................................................... 16

[e] KMD-900MWH .................................................................................................... 17

[f] KMD-900MRH ...................................................................................................... 18

2. Controller Board ......................................................................................................... 19

[a] Solid-State Control .............................................................................................. 19

[b] Controller Board .................................................................................................. 19

[c] Sequence ............................................................................................................ 23

[d] Controls and Adjustments ................................................................................... 26

[e] Checking the Controller Board ............................................................................ 30

3. Mechanical Bin Control .............................................................................................. 31

[a] Proximity Switch .................................................................................................. 31

[b] Explanation of Operation ..................................................................................... 31

[c] Troubleshooting ................................................................................................... 32

III. Technical Information ..................................................................................................... 33

1. Water Circuit and Refrigerant Circuit........................................................................... 33

[a] KMD-700MAH and KMD-900MAH ...................................................................... 33

[b] KMD-700MWH and KMD-900MWH .................................................................... 34

[c] KMD-700MRH and KMD-900MRH ...................................................................... 35

2. Wiring Diagrams ......................................................................................................... 36

[a1] KMD-700MAH and KMD-700MWH (auxiliary code R-0 and earlier) ................. 36

[a2] KMD-700MAH and KMD-700MWH (auxiliary code R-1 and later) .................... 37

[b1] KMD-700MRH (auxiliary code R-0 and earlier) ................................................ 38

[b2] KMD-700MRH (auxiliary code R-1 and later) .................................................... 39

[c1] KMD-900MAH and KMD-900MWH (auxiliary code R-0 and earlier) ................. 40

[c2] KMD-900MAH and KMD-900MWH (auxiliary code R-1 and later) .................... 41

[d1] KMD-900MRH (auxiliary code R-0 and earlier) ................................................. 42

[d2] KMD-900MRH (auxiliary code R-1 and later) .................................................... 43

3. Timing Chart ............................................................................................................... 44

4. Performance Data ....................................................................................................... 46

[a] KMD-700MAH ..................................................................................................... 46

[b] KMD-700MWH .................................................................................................... 47

[c] KMD-700MRH ..................................................................................................... 48

[d] KMD-900MAH ..................................................................................................... 49

[e] KMD-900MWH .................................................................................................... 50

[f] KMD-900MRH ...................................................................................................... 51

IV. Service Diagnosis.......................................................................................................... 52

1. No Ice Production ....................................................................................................... 52

2. Evaporator is Frozen Up ............................................................................................. 55

3. Low Ice Production ..................................................................................................... 56

4. Abnormal Ice .............................................................................................................. 56

5. Other ........................................................................................................................... 56

V. Removal and Replacement of Components ................................................................... 57

1. Service for Refrigerant Lines ...................................................................................... 57

[a] Refrigerant Recovery........................................................................................... 57

[b] Evacuation and Recharge [R-404A] .................................................................... 57

2. Brazing ....................................................................................................................... 58

3. Removal and Replacement of Compressor ................................................................ 59

4. Removal and Replacement of Drier ........................................................................... 61

5. Removal and Replacement of Expansion Valve......................................................... 61

6. Removal and Replacement of Hot Gas Valve and Line Valve .................................... 62

7. Removal and Replacement of Evaporator .................................................................. 64

8. Removal and Replacement of Water Regulating Valve (Water-Cooled Model Only) .. 65

9. Adjustment of Water Regulating Valve (Water-Cooled Model Only)............................ 66

10. Removal and Replacement of Condensing Pressure Regulator (C.P.R.) (Remote Air-

Cooled Model Only) ................................................................................................. 67

11. Removal and Replacement of Thermistor ................................................................ 68

12. Removal and Replacement of Fan Motor ................................................................. 69

13. Removal and Replacement of Water Valve ............................................................... 70

14. Removal and Replacement of Pump Motor .............................................................. 70

15. Removal and Replacement of Spray Tubes .............................................................. 71

16. Removal and Replacement of Bin Control ............................................................... 72

VI. Cleaning and Maintenance Instructions ........................................................................ 73

1. Preparing the Icemaker for Long Storage ................................................................... 73

2. Cleaning Instructions .................................................................................................. 76

[a] Cleaning Procedure ............................................................................................ 76

[b] Sanitizing Procedure - Following Cleaning Procedure ....................................... 79

3. Maintenance ............................................................................................................... 80

I. Specifications

1. KMD-700MAH

AC SUPPLY VOLTAGE 208-230/60/1 (3 wire with neutral for 115V) AMPERAGE 13.5 A ( 5 Min. Freeze AT 104°F / WT 80°F) MINIMUM CIRCUIT AMPACITY 14.3 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 *696 (316) 650 (295) 593 (269) Reference without *marks 80 661 (300) 589 (267) 536 (243)

90 650 (295) *539 (244) 483 (219)

100 641 (291) 526 (239) 432 (196) SHAPE OF ICE Crescent Cube ICE PRODUCTION PER CYCLE 9.6 lbs. (4.4 kg) 624 pcs. APPROXIMATE STORAGE CAPACITY N/A ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F ELECTRIC W (kWH/100 lbs.) 1590(7.1) 1540(5.3) WATER gal./24HR (gal./100 lbs.) 202(37.5) 406(58.4) EXTERIOR DIMENSIONS (WxDxH) 30" x 24.6" x 28" (762 x 625 x 713 mm) EXTERIOR FINISH Stainless Steel, Galvanized Steel (Rear) WEIGHT Net 217 lbs. (98 kg), Shipping 249 lbs. (113 kg) CONNECTIONS - ELECTRIC Permanent - Connection

- WATER SUPPLY Inlet 1/2" FPT

- DRAIN Outlet 3/4" FPT

5/8" OD Tube CUBE CONTROL SYSTEM Float Switch HARV ES TING CONTROL SYSTEM Hot Gas and Water, Thermist or and Timer ICE MAKING WATER CONTROL Timer Controlled. Overflow Pipe COOLING WATER CONTROL N/A BIN CONTROL SYSTEM Mechanical Level Switch and Timer COMPRESSOR Hermetic, Model CS10K6E-PFV-237 CONDENSER Air-Cooled, Fin and Tube Type EVAPORATOR Vertical type, Stainless Steel and Copper REFRIGERANT CONTROL Thermostatic Ex pansion Valve REFRIGERANT CHARGE R-404A, 2 lb. 8.6 oz. (1150g) 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-res et High Pres sure Control Switch LO W W A TE R P ROTE CTION Float S wi t c h ACCESSORIES -SUPPLIED N/A

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

AMBIENT TEMP. 45 -100° F WATER SUPPLY TEMP. 45 - 90° F WATER SUPPLY PRESSURE 20 - 145 PSIG

We reserve the right to make changes in specifications and design without prior notice.

2. KMD-700MWH

AC SUPPLY VOLTAGE 208-230/60/1 (3 wire with neutral for 115V) AMPERAGE 12 A ( 5 Min. Freeze AT 104°F / W T 80°F) MINIMUM CIRCUIT AMPACITY 12.9 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 *701 (318) 675 (306) 634 (288) Reference without *marks 80 681 (309) 640 (290) 597 (271)

90 675 (306) *611 (277) 569 (258)

100 665 (302) 601 (273) 530 (240) SHAPE OF ICE Crescent Cube ICE PRODUCTION PER CYCLE 9.6 lbs. (4.4 kg) 624 pcs. APPROXIMATE STORAGE CAPACITY N/A ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F ELECTRIC W (kWH/100 lbs.) 1520(6.0) 1500(5.1) WATER gal./24HR (gal./100 lbs.) 203(33.3) 272(38.9) WATER COOLED CONDENSER 607(99) 403(58) gal./24HR (gal./100 lbs.) EXTERIOR DIMENSIONS (WxDxH) 30" x 24.6" x 28" (762 x 625 x 713 mm) EXTERIOR FINISH Stainless Steel, Galvanized Steel (Rear) WEIGHT Net 217 lbs. (98 kg), Shipping 249 lbs. (113 kg) CONNECTIONS - ELECTRIC Permanent - Connection

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

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

5/8" OD Tube CUBE CONTROL SYSTEM Float Switch HARV ES TING CONTROL SYSTEM Hot Gas and Water, Thermist or and Timer ICE MAKING WATER CONTROL Timer Controlled. Overflow Pipe COOLING WATER CONTROL Pressure Regulator BIN CONTROL SYSTEM Mechanical Level Switch and Timer COMPRESSOR Hermetic, Model CS10K6E-PFV-237 CONDENSER Water-cooled, Tube in Tube Type EVAPORATOR Vertical type, Stainless Steel and Copper REFRIGERANT CONTROL Thermostatic Ex pansion Valve REFRIGERANT CHARGE R-404A, 1 lb. 10 Oz. (730g) 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-res et High Pres sure Control Switch LO W W A TE R P ROTE CTION Float S wi t c h ACCESSORIES -SUPPLIED N/A

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

AMBIENT TEMP. 45 -100° F WATER SUPPLY TEMP. 45 - 90° F WATER SUPPLY PRESSURE 20 - 145 PSIG

We reserve the right to make changes in specifications and design without prior notice.

3. KMD-700MRH

AC SUPPLY VOLTAGE 208-230/60/1 (3 wire with neutral for 115V) AMPERAGE 13 A ( 5 Min. Freeze AT 104°F / W T 80°F) MINIMUM CIRCUIT AMPACITY 13.15 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 *730 (331) 715 (324) 655 (297) Reference without *marks 80 719 (326) 696 (316) 614 (278)

90 715 (324) *679 (308) 605 (275)

100 690 (313) 662 (300) 538 (244) SHAPE OF ICE Crescent Cube ICE PRODUCTION PER CYCLE 9.6 lbs. (4.4 kg) 624 pcs. APPROXIMATE STORAGE CAPACITY N/A ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F ELECTRIC W (kWH/100 lbs.) 1790(6.3) 1750(5.7) WATER gal./24HR (gal./100 lbs.) 218(32.1) 385(52.7) EXTERIOR DIMENSIONS (WxDxH) 30" x 24.6" x 28" (762 x 625 x 713 mm) EXTERIOR FINISH Stainles s Steel, Galvanized Steel (Rear) WEIGHT Net 203 lbs. (92 kg), Shipping 235 lbs. (107 kg) CONNECTIONS - ELECTRIC Permanent - Connection

- WATER SUPPLY Inlet 1/2" FPT

- DRAIN Outlet 3/4" FPT

Condensing Pressure Regulator on URC-12F

REFRIGERANT CHARGE R-404A, 10 lb. 0.5 oz. (4550g)

(Icemaker 5 lbs . 9.9 oz. Cond. Unit 4 lb. 6.5 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-res et High Pres sure Control Switch LO W W A TE R P ROTE CTION Float S wi t c h ACCESSORIES -SUPPLIED N/A

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

AMBIENT TEMP. 45 -100° F

WATER SUPPLY TEMP. 45 - 90° F

WATER SUPPLY PRESSURE 20 - 145 PSIG

We reserve the right to make changes in specifications and design without prior notice.

4. KMD-900MAH

AC SUPPLY VOLTAGE 208-230/60/1 (3 wire with neutral for 115V) AMPERAGE 15 A ( 5 Min. Freeze AT 104°F / W T 80°F) MINIMUM CIRCUIT AMPACITY 15.5 A MAXIMUM FUSE SIZE 25 A APPROXIMATE ICE PRODUCTION Ambient WATER TEMP. (°F) PER 24 HR. Temp.(°F) 50 70 90 lbs./day ( kg/day ) 70 *875 (397) 842 (382) 767 (348) Reference without *marks 80 850 (386) 799 (362) 706 (320)

90 842 (382) *763 (346) 676 (307)

100 817 (370) 743 (337) 596 (270) SHAPE OF ICE Crescent Cube ICE PRODUCTION PER CYCLE 9.6 lbs. (4.4 kg) 624 pcs. APPROXIMATE STORAGE CAPACITY N/A ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F ELECTRIC W (kWH/100 lbs.) 2000(6.3) 1930(5.3) WATER gal./24HR (gal./100 lbs.) 265(34.7) 507(57.9) EXTERIOR DIMENSIONS (Wx DxH) 42" x 24.6" x 28" (1067 x 625 x 713 mm) EXTERIOR FINISH Stainles s Steel, Galvanized Steel (Rear) WEIGHT Net 240 lbs. (109 kg), Shipping 278 lbs. (126 kg) CONNECTIONS - ELECTRIC Permanent - Connection

- WATER SUPPLY Inlet 1/2" FPT

- DRAIN Outlet 3/4" FPT

5/8" OD Tube CUBE CONTROL SYSTEM Float Switch HARV ES TING CONTROL SYSTEM Hot Gas and Water, Thermist or and Timer ICE MAKING WATER CONTROL Timer Controlled. Overflow Pipe COOLING WATER CONTROL N/A BIN CONTROL SYSTEM Mechanical Level Switch and Timer COMPRESSOR Hermetic, Model CS14K6E-PFV-237 CONDENSER Air-Cooled, Fin and Tube Type EVAPORATOR Vertical type, Stainless Steel and Copper REFRIGERANT CONTROL Thermostatic Ex pansion Valve REFRIGERANT CHARGE R-404A, 3 lb. 8.3 Oz. (1600g) 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-res et High Pres sure Control Switch LO W W A TE R P ROTE CTION Float S wi t c h ACCESSORIES -SUPPLIED N/A

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

AMBIENT TEMP. 45 -100° F WATER SUPPLY TEMP. 45 - 90° F WATER SUPPLY PRESSURE 20 - 145 PSIG

We reserve the right to make changes in specifications and design without prior notice.

5. KMD-900MWH

AC SUPPLY VOLTAGE 208-230/60/1 (3 wire with neutral for 115V) AMPERAGE 14 A ( 5 Min. Freeze AT 104°F / W T 80°F) MINIMUM CIRCUIT AMPACITY 14.7 MAXIMUM FUSE SIZE 25 A APPROXIMATE ICE PRODUCTION Ambient WATER TEMP. (°F) PER 24 HR. Temp.(°F) 50 70 90 lbs./day ( kg/day ) 70 *886 (402) 859 (390) 816 (370) Reference without *marks 80 865 (392) 823 (373) 777 (352)

90 859 (390) *793 (360) 747 (339)

100 848 (385) 782 (355) 705 (320) SHAPE OF ICE Crescent Cube ICE PRODUCTION PER CYCLE 9.6 lbs. (4.4 kg) 624 pcs. APPROXIMATE STORAGE CAPACITY N/A ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F ELECTRIC W (kWH/100 lbs.) 1950(5.9) 1950(5.3) WATER gal./24HR (gal./100 lbs.) 301(37.9) 452(51.1) WATER COOLED CONDENSER 831(105) 526(59) gal./24HR (gal./100 lbs.) EXTERIOR DIMENSIONS (WxDxH) 30" x 24.6" x 28" (762 x 625 x 713 mm) EXTERIOR FINISH Stainles s Steel, Galvanized Steel (Rear) WEIGHT Net 219 lbs. (99 kg), Shipping 251 lbs. (114 kg) CONNECTIONS - ELECTRIC Permanent - Connection

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

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

5/8" OD Tube CUBE CONTROL SYSTEM Float Switch HARV ES TING CONTROL SYSTEM Hot Gas and Water, Thermist or and Timer ICE MAKING WATER CONTROL Timer Controlled. Overflow Pipe COOLING WATER CONTROL Pressure Regulator BIN CONTROL SYSTEM Mechanical Level Switch and Timer COMPRESSOR Hermetic, Model CS14K6E-PFV-237 CONDENSER Water-cooled, Tube in Tube Type EVAPORATOR Vertical type, Stainless Steel and Copper REFRIGERANT CONTROL Thermostatic Ex pansion Valve REFRIGERANT CHARGE R-404A, 2 lb. 0 Oz. (900g) 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-res et High Pres sure Control Switch LO W W A TE R P ROTE CTION Float S wi t c h ACCESSORIES -SUPPLIED N/A

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

AMBIENT TEMP. 45 -100° F WATER SUPPLY TEMP. 45 - 90° F WATER SUPPLY PRESSURE 20 - 145 PSIG

We reserve the right to make changes in specifications and design without prior notice.

6. KMD-900MRH

AC SUPPLY VOLTAGE 208-230/60/1 (3 wire with neutral for 115V) AMPERAGE 14 A ( 5 Min. Freeze AT 104°F / W T 80°F) MINIMUM CIRCUIT AMPACITY 14.65 A MAXIMUM FUSE SIZE 25 A APPROXIMATE ICE PRODUCTION Ambient WATER TEMP. (°F) PER 24 HR. Temp.(°F) 50 70 90 lbs./day ( kg/day ) 70 *906 (411) 878 (398) 814 (369) Reference without *marks 80 885 (401) 842 (382) 763 (346)

90 878 (398) *812 (368) 737 (335)

100 857 (389) 795 (360) 669 (303) SHAPE OF ICE Crescent Cube ICE PRODUCTION PER CYCLE 9.6 lbs. (4.4 kg) 624 pcs. APPROXIMATE STORAGE CAPACITY N/A ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F ELECTRIC W (kWH/100 lbs.) 2220(6.6) 2075(5.9) WATER gal./24HR (gal./100 lbs.) 266(33.4) 465(53.1) EXTERIOR DIMENSIONS (WxDxH) 30" x 24.6" x 28" (762 x 625 x 713 mm) EXTERIOR FINISH Stainles s Steel, Galvanized Steel (Rear) WEIGHT Net 226 lbs. (103 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-12F

REFRIGERANT CHARGE R-404A, 9 lb. 6 Oz. (4250g)

(Icemaker 4 lbs. 15 oz. Cond. Unit 4 lb. 7 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-res et High Pres sure Control Switch LO W W A TE R P ROTE CTION Float S wi t c h ACCESSORIES -SUPPLIED N/A

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

AMBIENT TEMP. 45 -100° F

WATER SUPPLY TEMP. 45 - 90° F

WATER SUPPLY PRESSURE 20 - 145 PSIG

We reserve the right to make changes in specifications and design without prior notice.

7. Condensing Unit

URC-12F

MODEL: URC-12F

Specifications

EXTERIOR

DIMENSIONS (W x D x H)

REFRIGERANT CHARGE

URC-12F

WEIGHT

CONNECTIONS

REFRIGERANT ELECTRICAL

CONDENSER

HEAD PRESSURE CONTROL

AMBIENT CONDITION

Galvanized Steel

35 - 11/16” x 15-11/16” x 21-15/16” (907.2 x 398 x 557.8 mm)

R404A 4 lbs. 7 oz. (2000 g)

Net 80 lbs. (36 kg) Shipping 87 lbs. (39 kg)

One Shot Couplings (Aeroquip) Permanent Connection

Air-cooled

Condensing Pressure Regulator

Min. -20°F - Max. +122°F (-29°C to +50°C) Outdoor use

II. General Information

1. Construction

[a] KMD-700MAH

EXPANSION VALVE

SPRAY TUBE

FLOAT SWITCH

CONTROL BOX

WATER SUPPLY INLET

HOT GAS VALVE

JUNCTION BOX

CONDENSER

CONDENSER FAN MOTOR

WATER PUMP

COMPRESSOR

BIN CONTROL

DRIER

[b] KMD-700MWH

EXPANSION VALVE

SPRAY TUBE

FLOAT SWITCH

CONTROL BOX

WATER SUPPLY INLET

HOT GAS VALVE

JUNCTION BOX

CONDENSER

WATER REGULATOR

WATER PUMP

COMPRESSOR

BIN CONTROL

DRIER

[c] KMD-700MRH

EXPANSION VALVE

WATER SUPPLY INLET

SPRAY TUBE

FLOAT SWITCH

CONTROL BOX

WATER PUMP

HOT GAS VALVE

JUNCTION BOX

RECEIVER TANK

DRIER

COMPRESSOR

BIN CONTROL

LINE VALVE

[d] KMD-900MAH

WATER SUPPLY INLET

SPRAY TUBE

FLOAT SWITCH

WATER PUMP

EXPANSION VALVE

HOT GAS VALVE

JUNCTION BOX

CONDENSER

CONDENSER FAN MOTOR

CONTROL BOX

COMPRESSOR

BIN CONTROL

DRIER

[e] KMD-900MWH

EXPANSION VALVE

SPRAY TUBE

FLOAT SWITCH

CONTROL BOX

WATER SUPPLY INLET

HOT GAS VALVE

JUNCTION BOX

CONDENSER

WATER REGULATOR

WATER PUMP

COMPRESSOR

BIN CONTROL

DRIER

[f] KMD-900MRH

EXPANSION VALVE

WATER SUPPLY INLET

SPRAY TUBE

FLOAT SWITCH

CONTROL BOX

HOT GAS VALVE

JUNCTION BOX

RECEIVER TANK

WATER PUMP

COMPRESSOR

BIN CONTROL

DRIER

LINE VALVE

2. Controller Board

[a] Solid-State Control

1) A HOSHIZAKI exclusive solid-state control is employed in KMD Modular Crescent Cubers.

2) A printed circuit board (hereafter called “controller board”) includes a stable and high quality control system.

3) All models are pretested and factory-adjusted.

[b] Controller Board

CAUTION

1. Fragile, handle very carefully.

2. A controller 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 when handling or replacing the board.

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

4. Do not change wiring and connections. Do not misconnect K3, K4 and K5, because the same connector is used for the thermistor (white), float switch (black), and mechanical bin control (red).

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

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

Part Number Type

2A1410-01 HOS-001A (Control Products)

Features of Control Products “E” Controller Board

1) Maximum Water Supply Period - 6 minutes

Water solenoid valve opening, in the defrost (harvest) cycle, is limited by the defrost timer. The water valve cannot remain open longer than the maximum period. The water valve can close in less than six minutes if the defrost cycle is completed.

2) Defrost Timer

The defrost cycle starts when the float switch opens and completes the freeze cycle. But the defrost timer does not start counting until the thermistor senses 48°F at the evaporator outlet. The period from the end of the freeze cycle up to the point of the thermistor's sensing varies depending on the ambient and water temperatures.

3) High Temperature Safety - 127 ± 7°F

The temperature of the suction line in the refrigerant circuit is limited by the high temperature safety. During the defrost cycle the evaporator temperature rises. The thermistor senses 48°F and starts the defrost timer. After the defrost timer counts down to zero, the normal freeze cycle begins. If the evaporator temperature continues to rise, the thermistor will sense the rise in temperature and at 127 ± 7°F the thermistor operates the high temperature safety. This high temperature safety shuts down the circuit and the icemaker automatically stops. This high temperature safety protects the unit from excessive temperature. The control board will beep every 3 seconds. The white reset button on the control board must be pressed with power on to reset the safety.

4) Low Water Safety

If the pump motor is operated without water, the mechanical seal can fail. To prevent this type of failure, the controller board checks the position of the float switch at the end of the initial one minute water fill cycle and at the end of each defrost cycle. If the float switch is in the up position (electrical circuit closed), the controller board changes to the ice making cycle. If the float switch is in the down position (electrical circuit open), the controller board changes to a one minute water fill cycle before starting the ice making cycle. This method allows for a low water safety shut down to protect the water pump from mechanical seal failure. For water-cooled model, if the water is shut off, the unit is protected by the high pressure switch.

5) High Voltage Cutout

The maximum allowable supply voltage of this icemaker is limited by the high voltage cutout. If miswiring (especially on single phase 3 wire models) causes excessive voltage on the controller board, the high voltage cutout shuts down the circuit in 3 seconds and the icemaker automatically stops. When the proper supply voltage is resumed, the icemaker automatically starts running again. The control board will signal this problem using 7 beeps every 3 seconds.

6) LED Lights and Audible Alarm Safeties

The red LED indicates proper control voltage and will remain on unless a control voltage problem occurs. At startup a 5 second delay occurs while the board conducts an internal timer check. A short beep occurs when the power switch is turned ON or OFF.

The green LEDs 1-4 represent the corresponding relays and energize and sequence 5 seconds from initial startup as follows:

Time LEDs are Lit

1 Minute Fill Cycle

Harvest Cycle

Freeze Cycle

Reverse Pump Out

LEDSequence Step

460 seconds

1, 4, and 2 2 minutes 20 minutes 3 to 5 minutes

1 5 minutes 60 minutes 30 to 35 minutes

1, 3, and 2 10 seconds 20 seconds fac tory setting

Min. Max. Avg.

{LED 1 – Comp; LED 2 - HGV/CFM; LED 3 – PM; LED 4 - WV}

The built in safeties shut down the unit and have alarms as follows:

No. of Beeps

(every 3 sec.)

1 High Evaporator Temp.

(temperature > 127°F)

2 Defrost Backup Timer

(defrost > 20 min.)

3 Freeze Backup Timer

(freeze > 60 min.)

4 Short Circuit

(between the K4 connection on the control board and the bin control relay)

5 Open Circuit

(between the K4 connection on the control board and the bin control relay)

To manually res et the above safeties, press the white alarm reset button with the power supply on.

6Low Voltage

(92Vac or less)

7 High Voltage

(control voltage > 147Vac ±5%)

Type of Alarm Notes

Check for defrost problem (stuck HGV or relay), hot water entering unit, stuc k headmaster, or shorted thermistor.

Orange LED marked 20 MIN lights up. Check for open thermistor, HGV not opening, TXV leaking by, low charge, or inefficient compressor.

Yellow LED marked 60 MIN lights up. Check for F/S stuck closed (up), WV leaking by, HGV leaking by, TXV not feeding properly, low charge, or inefficient compressor.

Check connec tions and replace wire harness if necessary.

Red LED will turn off if voltage protection operates. The voltage safety automatically resets when voltage is corrected.

The Output Test switch “S3” provides a relay sequence test. With power OFF, place S3 ON and switch power to ICE. The correct lighting sequence should be none, 2, 3, 4, 1, & 4, normal sequence every 5 seconds. (The LEDs are not in numerical order on the board. See the diagram on the next page for the location and numbering of LEDs). S3 should remain in the “OFF” position for normal operation.

The application switch located between relay X3 & X4 must be set to match the original board application. Place this switch in the ALP position if there is no white wire supplied to the K1 connector. If there is a white wire, place the switch in the C position. If this switch is placed in the wrong position, either the compressor contactor will remain energized with the control switch OFF, or the unit will not start.

The dip switches should be adjusted per the adjustment chart published in the Tech Specs book. Number 8 must remain in the OFF position.

(Control Products HOS-001A Board)

[c] Sequence

1st Cycle

1. Unit energized and control switch to “ICE” position. Water supply cycle starts.

2. After 1 minute, defrost cycle starts.

3. Thermistor reads 48°F. Defrost timer starts counting.

5. After first 5 minutes in freeze cycle, cycle can complete when float switch circuit opens.

If bin control signals that bin is full within first 5 minutes in freeze cycle, the machine will shut down.

IMPORTANT

1. Board never accepts freeze completion signal from float switch within first 5 minutes in freeze cycle.

2. If bin control signals that bin is full after first 5 minutes in freeze cycle, board will allow machine to complete freeze cycle and following harvest cycle.

IMPORTANT

Water valve opening is limited to 6 minutes.

4. Defrost timer stops counting. Defrost cycle is completed and freeze cycle starts.

IMPORTANT

1. Board never accepts defrost completion signal within the first 2 minutes in defrost cycle.

2. Defrost cycle time is limited to 20 minutes even if defrost timer does not stop counting.

2nd Cycle and after with pump drain

IMPORTANT

Freeze cycle time is limited to 60 minutes even if float switch does not open.

1. Float switch opens and signals to complete freeze cycle. Drain timer starts counting.

2. Drain timer stops counting. Pump drain is completed

3. Thermistor reads 48°F. Defrost timer starts counting.

IMPORTANT

Water valve opening is limited to 6 minutes.

5. After first 5 minutes in freeze cycle, cycle can complete when float switch circuit opens.

If bin control signals that bin is full within first 5 minutes in freeze cycle, the machine will shut down.

IMPORTANT

1. Board never accepts freeze completion signal from float switch within first 5 minutes in freeze cycle.

2. If bin control signals that bin is full after first 5 minutes in freeze cycle, board will allow machine to complete freeze cycle and following harvest cycle.

4. Defrost timer stops counting. Defrost cycle is completed and freeze cycle starts.

IMPORTANT

1. Board never accepts defrost completion signal within the first 2 minutes in defrost cycle.

2. Defrost cycle time is limited to 20 minutes even if defrost timer does not stop counting.

+ 56 hidden pages

Hoshizaki America KMD-700MAH Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

I. Specifications

1. KMD-700MAH

2. KMD-700MWH

3. KMD-700MRH

4. KMD-900MAH

5. KMD-900MWH

6. KMD-900MRH

7. Condensing Unit

URC-12F

II. General Information

1. Construction

[a] KMD-700MAH

[b] KMD-700MWH

[c] KMD-700MRH

[d] KMD-900MAH

[e] KMD-900MWH

[f] KMD-900MRH

2. Controller Board

[a] Solid-State Control

[b] Controller Board

[c] Sequence