Hoshizaki KM-650MAH, KM-650MRH, KM-650MWH User Manual

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Hoshizaki

“A Superior Degree

of Reliability”

www.hoshizaki.com

Models KM-650MAH KM-650MWH KM-650MRH

Modular Crescent Cuber

Hoshizaki America, Inc.

SERVICE MANUAL

™

Number: 73147 Issued: 12-12-2006

IMPORTANT

Only qualiﬁed service technicians should attempt to service or maintain this unit. No such 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 unit.

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 Service (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

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

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

1. KM-650MAH (air-cooled) ......................................................................................... 5

2. KM-650MWH (water-cooled) ................................................................................... 6

3. KM-650MRH (remote air-cooled) ............................................................................ 7

B. Condensing Unit ............................................................................................................ 8

1. URC-5F ................................................................................................................... 8

II. General Information ......................................................................................................... 10

A. Construction ................................................................................................................ 10

1. KM-650MAH (air-cooled) .......................................................................................

2. KM-650MWH (water-cooled) ................................................................................. 11

3. KM-650MRH (remote air-cooled) .......................................................................... 12

B. Sequence of Operation ............................................................................................... 13

1. One Minute Fill Cycle ............................................................................................ 13

2. Initial Harvest Cycle .............................................................................................. 13

3. Freeze Cycle ......................................................................................................... 13

4. Pump-Out Cycle ................................................................................................... 13

5. Normal Harvest Cycle .......................................................................................... 13

C. Control Board .............................................................................................................. 15

1. Control Board Layout ............................................................................................. 16

2. Features ................................................................................................................ 17

a) Maximum Water Supply Period – 6 minutes ....................................................... 17

b) Harvest Backup Timer and Freeze Timer ........................................................... 17

c) High Temperature Safety .................................................................................... 17

d) Low Water Safety ............................................................................................... 17

e) High Voltage and Low Voltage Cut-outs ............................................................. 17

f) LED Lights and Audible Alarm Safeties ............................................................... 18

3. Controls and Adjustments ..................................................................................... 19

a) Default Dip Switch Settings ................................................................................ 19

b) Harvest Control – Thermistor ............................................................................. 19

c) Harvest Timer (dip switch 1 & 2) ......................................................................... 20

d) Pump-Out Timer (dip switch 3 & 4)..................................................................... 20

e) Pump-Out Frequency Control (dip switch 5 & 6) ................................................ 21

f) Freeze Timer (dip switch 9 & 10) ......................................................................... 21

g) Bin Control .......................................................................................................... 21

4. Control Board Check Procedure ............................................................................ 22

5. Control Board Replacement .................................................................................. 22

III. Technical Information ...................................................................................................... 23

A. Water Circuit and Refrigeration Circuit ........................................................................ 23

1. KM-650MAH (air-cooled) .......................................................................................

2. KM-650MWH (water-cooled) ................................................................................. 24

3. KM-650MRH (remote air-cooled) .......................................................................... 25

B. Wiring Diagrams .......................................................................................................... 26

1. KM-650MAH (air-cooled) and KM-650MWH (water-cooled) .................................

2. KM-650MRH (remote air-cooled) ..........................................................................

C. Performance Data ....................................................................................................... 28

1. KM-650MAH (air-cooled) ....................................................................................... 28

2. KM-650MWH (water-cooled) ................................................................................. 29

3. KM-650MRH (remote air-cooled) .......................................................................... 30

IV. Service Diagnosis ........................................................................................................... 31

A. 10-Minute KM Diagnostic Procedure ......................................................................... 31

B. Diagnostic Charts ........................................................................................................ 32

1. No Ice Production .................................................................................................. 32

2. Evaporator is Frozen Up ........................................................................................ 36

3. Low Ice Production ................................................................................................ 37

4. Abnormal Ice ......................................................................................................... 37

5. Other ...................................................................................................................... 37

V. Removal and Replacement of Components .................................................................... 39

A. Service for Refrigerant Lines ...................................................................................... 39

1. Refrigerant Recovery ............................................................................................. 39

2. Evacuation and Recharge (R-404A) ...................................................................... 39

B. Brazing ........................................................................................................................ 40

C. Removal and Replacement of Compressor ................................................................ 40

D. Removal and Replacement of Drier ............................................................................ 41

E. Removal and Replacement of Expansion Valve .......................................................... 42

F. Removal and Replacement of Hot Gas Valve and Line Valve ..................................... 43

G. Removal and Replacement of Evaporator .................................................................. 44 H. Removal and Replacement of Water Regulating Valve - Water Cooled Model Only ... 44

I. Adjustment of Water Regulating Valve - Water-Cooled Model Only ............................. 45 J. Removal and Replacement of Headmaster (Condensing Pressure Regulator - C.P.R.)

- Remote Air-Cooled Model Only .............................................................................. 46

K. Removal and Replacement of Thermistor ................................................................... 47

L. Removal and Replacement of Fan Motor .................................................................... 47

M. Removal and Replacement of Inlet Water Valve ......................................................... 48

N. Removal and Replacement of Pump Motor ................................................................ 48

O. Removal and Replacement of Spray Tubes ................................................................ 49

VI. Cleaning and Maintenance Instructions ......................................................................... 50

A. Cleaning and Sanitizing Procedures ........................................................................... 50

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

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

B. Maintenance ................................................................................................................ 52

C. Preparing the Icemaker for Long Storage ................................................................... 53

26 27

51 52

I. Speciﬁcations

SPECIFICATION NO. 06A019 ISSUED: 10/10/2006

ITEM: HOSHIZAKI MODULAR CRESCENT CUBER MODEL: KM-650MAH

AC SUPPLY VOLTAGE 208-230/60/1 (3 wire with neutral for 115V) AMPERAGE 6.6 A ( 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 *589 (267) 566 (257) 526 (238) Reference without *marks 80 572 (259) 537 (243) 490 (222)

90 566 (257) *512 (232) 467 (212)

100 555 (252) 501 (227) 426 (193) SHAPE OF ICE Crescent Cube ICE PRODUCTION PER CYCLE 13.5 lbs. (6.1 kg) 720 pcs. APPROXIMATE STORAGE CAPACITY N/A ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F ELECTRIC W (kWH/100 lbs.) 1240(5.8) 1100(4.5) WATER gal./24HR (gal./100 lbs.) 108(21.1) 257(43.7) EXTERIOR DIMENSIONS (WxDxH) 22" x 27-3/8" x 37-7/16" (560 x 695 x 950 mm) EXTERIOR FINISH Stainless Steel, Galvanized Steel (Rear) WEIGHT Net 169 lbs. (77 kg), Shipping 200 lbs. (91 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 RS55C2E-CAV CONDENSER Air-Cooled , Fin and tube type EVAPORATOR Vertical type, Stainless Steel and Copper REFRIGERANT CONTROL Thermostatic Expansion Valve REFRIGERANT CHARGE R-404A, 1 lb. 8.7 oz. (700g) 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

A. Icemaker

1. KM-650MAH (air-cooled)

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

notice.

2. KM-650MWH (water-cooled)

SPECIFICATION NO. 06A020 ISSUED: 10/10/2006

ITEM: HOSHIZAKI MODULAR CRESCENT CUBER MODEL: KM-650MWH

AC SUPPLY VOLTAGE 208-230/60/1 (3 wire with neutral for 115V) AMPERAGE 5.3 A ( 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 *680 (308) 675 (306) 626 (284) Reference without *marks 80 676 (307) 668 (303) 595 (270)

90 675 (306) *662 (300) 598 (271)

100 651 (295) 647 (294) 540 (245) SHAPE OF ICE Crescent Cube ICE PRODUCTION PER CYCLE 14.8 lbs. (6.7 kg) 720 pcs. APPROXIMATE STORAGE CAPACITY N/A ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F ELECTRIC W (kWH/100 lbs.) 1050(3.8) 1020(3.6) WATER gal./24HR (gal./100 lbs.) 149(22.5) 254(37.4) WATER COOLED CONDENSER 741(112) 408(60)

gal./24HR (gal./100 lbs.) EXTERIOR DIMENSIONS (WxDxH) 22" x 27-3/8" x 37-7/16" (560 x 695 x 950 mm) EXTERIOR FINISH Stainless Steel, Galvanized Steel (Rear) WEIGHT Net 169 lbs. (77 kg), Shipping 200 lbs. (91 kg) CONNECTIONS - ELECTRIC Permanent - Connection

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

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

3/8" OD Tube CUBE CONTROL SYSTEM Float Switch HARVESTING CONTROL SYSTEM Hot Gas and Water, Thermistor and Timer ICE MAKING WATER CONTROL Timer Controlled. Overflow Pipe COOLING WATER CONTROL Pressure Regulator BIN CONTROL SYSTEM Thermostat COMPRESSOR Hermetic, Model RS55C2E-CAV CONDENSER Water-cooled, Tube in tube type EVAPORATOR Vertical type, Stainless Steel and Copper REFRIGERANT CONTROL Thermostatic Expansion Valve REFRIGERANT CHARGE R-404A, 1 lb. 5.7 oz. (615g) 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 speciﬁcations and design without prior

notice.

3. KM-650MRH (remote air-cooled)

SPECIFICATION DATA NO. 06A021 ITEM: HOSHIZAKI MODULAR CRESCENT CUBER MODEL: KM-650MRH

AC SUPPLY VOLTAGE 208-230/60/1 (3 wire with neutral for 115V) AMPERAGE 7.1 A ( 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 *615 (279) 597 (271) 556 (252) Reference without *marks 80 601 (273) 574 (260) 523 (237)

90 597 (271) *554 (251) 506 (230)

100 583 (264) 543 (246) 462 (210) SHAPE OF ICE Crescent Cube ICE PRODUCTION PER CYCLE 14.1 lbs. (6.4 kg ) 720 pcs. APPROXIMATE STORAGE CAPACITY N/A ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F ELECTRIC W (kWH/100 lbs.) 1250(5.4) 1150(4.5) WATER gal./24HR (gal./100 lbs.) 111(20.0) 266(43.2) EXTERIOR DIMENSIONS (WxDxH) 22" x 27-3/8" x 37-7/16" (560 x 695 x 950 mm) EXTERIOR FINISH Stainless Steel, Galvanized Steel (Rear) WEIGHT Net 169 lbs. (77 kg), Shipping 200 lbs. (91 kg) CONNECTIONS - ELECTRIC Permanent - Connection

- WATER SUPPLY Inlet 1/2" FPT

- DRAIN Outlet 3/4" FPT

Condensing Pressure Regulator on URC-5F

REFRIGERANT CHARGE R-404A, 5 lbs. 11 oz. (2580 g)

( Icemaker 3 lbs. 13 oz. Cond. Unit 1 lb. 14 oz. ) DESIGN PRESSURE High 467 PSIG, Low 230 PSIG 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

ISSUED: 10/10/2006

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

notice.

B. Condensing Unit

1. URC-5F

24"

(610 mm.)

23-1/32"

(585 mm.)

18-1/8"

(460 mm.)

17-1/8"

(435 mm.)

14-9/16"

(370 mm.)

19-11/16"

(500 mm.)

18-1/8"

(460 mm.)

20-15/32"

(520 mm.)

21-15/16"

(557 mm.)

6/16" x 3/4" (10 mm. x 20 mm.)

4 x 2 (SLOTTED HOLES)

14-1/8"

(358 mm.)

14-15/16"

15-11/16"

(380 mm.)

(398 mm.)

17-7/8"

(454 mm.)

14-15/16"

(380 mm.)

2-1/2"

(63 mm.)

7/8" DIA. HOLE

(23 mm. DIA.)

6-5/16"

(160 mm.)

2-15/16"

(75 mm.)

Speciﬁcations

SPECIFICATION NO. 06A022

ISSUED: 10/12/2006

ITEM: HOSHIZAKI REMOTE CONDENSER UNIT

MODEL URC-5F

BEGINNING SERIAL NO. ________________

ENDING SERIAL NO. ___________________

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

FAN MOTOR 115 V Total 1.3FLA 65W

EXTERIOR DIMENSIONS (WxDxH) 21-15/16" x 15-11/16" x 17-7/8" (557 x 398 x 454 mm)

DIMENSIONS INCLUDING LEGS (WxDxH) 24" x 18-1/8" x 32-13/16" (610 x 460 x 834 mm)

EXTERIOR FINISH Galvanized Steel

WEIGHT Net 61 lbs. ( 28 kg ) Shipping 68 lbs. ( 31 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 1 lb. 14 oz. (850g)

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

DRAWING NO. (DIMENSION) 441211

MODEL: URC-5F

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

notice.

II. General Information

A. Construction

1. KM-650MAH (air-cooled)

Spray Tubes

Water Supply Inlet

Condenser

Control Switch

Bin Control Thermostat

Expansion Valve

Float Switch

Water Pump

Control Box

Fan Motor

Hot Gas Valve

Drier

Compressor

2. KM-650MWH (water-cooled)

Spray Tubes

Water Supply Inlet

Control Switch

Bin Control Thermostat

Expansion Valve

Float Switch

Water Pump

Water Regulator Valve

Control Box

Condenser

Drier

Hot Gas Valve

Compressor

3. KM-650MRH (remote air-cooled)

Spray Tubes

Water Supply Inlet

Junction Box

Control Switch

Bin Control Thermostat

Expansion Valve

Float Switch

Water Pump

Control Box

Receiver Tank

Hot Gas Valve

Drier

Compressor

Liquid Line Valve

B. Sequence of Operation

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

1. One Minute Fill Cycle

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

2. Initial Harvest Cycle

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

3. Freeze Cycle

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

4. Pump-Out Cycle

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

6).

5. Normal Harvest Cycle

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

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

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

Cycle

4. Pump-Out

F/S in

control

5 minute timer

in control

• Minimum freeze time: 5 minutes

• Maximum freeze time: freeze timer setting

Pump motor stops

for 2 sec. and then

Freeze cycle

operation turned

over to F/S

F/S closed

Comp continues

FMR continues

HGV de-energized

F/S Check

reverses for 10/20 sec.

each 1, 2, 5, or 10 cycles.

Comp continues

FMR continues

HGV energized

FMS de-energized

WV de-energized

PM energized

FMS energized

F/S open

1 to 3 minute timer

in control

Thermistor temp

reaches 48°F (9°C)

2. Harvest Cycle 3. Freeze Cycle

Thermistor in

• Maximum harvest time: 20 minutes

Fill Cycle

control

F/S closed

Initial startup always

begins here

Comp energized

HGV energized

F/S Check

WV Energized

"E" board will have

5 second delay

• Maximum inlet water valve time: 6 minutes

1. One Minute

KM-650MAH, KM-650MWH, KM-650MRH Sequence Flow Chart and Component Operation

Cycle Steps

(3.9 kΩ or less)

Harvest timer starts

FMR energized

WV continues

F/S open

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

Components Energized when the Control Switch is in the WASH Position

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

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

Legend:

Comp - compressor

FMR - remote fan motor

FMS - self-contained fan motor

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

F/S - ﬂoat switch

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

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

HGV - hot gas valve

when the control switch is placed in the ICE position.

PM - pump motor

WV - inlet water valve

C. Control Board

• A HOSHIZAKI exclusive solid-state control is employed in KM-650MAH, KM-650MWH and KM-650MRH Modular Crescent Cubers.

• All models are pretested and factory-adjusted.

CAUTION

1. Fragile, handle very carefully.

2. A control board contains integrated circuits, which are susceptible to failure due to static discharge. It is especially important to touch the metal part of the unit 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 and ﬂoat switch. K4 is not connected.

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

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

1. Control Board Layout

Control Products "E" Control Board

Alarm Reset Switch

Backup Freeze Timer LED

Backup Harvest Timer LED

Alarm Buzzer

Dip Switch

Output Test Switch (used to test relays on board)

Connector K3 Harvest Control (thermistor)

Connector K4 Open (not connected)

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

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

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

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

LED 4 Water Valve (WV)

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

Transformer Connector

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

Connector K5 Float Switch

Part Number

Connector K1

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

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

Control Board

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

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

2. Features

a) Maximum Water Supply Period – 6 minutes

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

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 will signal 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 speciﬁed to complete. The control board will signal this problem using 3 beeps every 3 seconds. The time is factory set using dip switches 9 &

10. The 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 rises above 127 ± 7°F (53 ± 4°C), the thermistor operates the safety. This shuts down the circuit and the icemaker automatically stops. The control board will signal this problem using 1 beep every 3 seconds. The reset button on the control board must be pressed with power on to reset the safety.

d) Low Water Safety

If the pump motor is operated without water, the mechanical seal can fail. To prevent this type of failure, the control 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 harvest cycle. If the ﬂoat switch is in the up position (electrical circuit closed), the control board changes to the ice making cycle. If the ﬂoat switch is in the down position (electrical circuit open), the control board changes to additional one minute water ﬁll cycles until water enters the sump and the ﬂoat switch closes. When the ﬂoat switch closes, the control board changes to the ice making cycle. The unit will not start without adequate water in the sump. This serves as a low water safety to protect the pump motor from mechanical seal failure. For water-cooled model, if the water 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) on the control board, 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.

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