Hoshizaki America KM-1800SAH Service Manual

™

SERVICE MANUAL

ISSUED:

November 11, 2005

KM-1800SAH/3 KM-1800SWH/3 KM-1800SRH/3

STACKABLE CRESCENT CUBER

Reliability is a beautiful thing

TM

REVISED:

December xx, 200x

NUMBER:

73131

IMPORTANT

Only qualiﬁed service technicians should attempt to service or maintain this icemaker. 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 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: 1-800-843-1056 (770) 487-3360

Web Site: www.hoshizaki.com

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

following information:

• Model Number

• Serial Number

• Complete and detailed explanation of the problem

2

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-1800SAH (air-cooled) ....................................................................................... 5

2. KM-1800SAH3 (air-cooled, 3 phase) ....................................................................... 6

3. KM-1800SWH (water-cooled) .................................................................................. 7

4. KM-1800SWH3 (water-cooled, 3 phase) ................................................................. 8

5. KM-1800SRH (remote air-cooled) ........................................................................... 9

6. KM-1800SRH3 (remote air-cooled, 3 phase) ........................................................ 10

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

1. URC-20F ............................................................................................................... 11

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

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

1. KM-1800SAH/3 ...................................................................................................... 13

2. KM-1800SWH/3 ..................................................................................................... 14

3. KM-1800SRH/3 ..................................................................................................... 15

B. Controller Board .......................................................................................................... 16

1. Solid-State Control ................................................................................................ 16

2. Controller Board .................................................................................................... 16

3. Sequence .............................................................................................................. 20

4. Controls and Adjustments ..................................................................................... 23

5. Checking the Controller Board .............................................................................. 26

III. Technical Information ...................................................................................................... 27

A. Water Circuit and Refrigerant Circuit ........................................................................... 27

1. KM-1800SAH/3 ...................................................................................................... 27

2. KM-1800SWH/3 ..................................................................................................... 28

3. KM-1800SRH/3 ..................................................................................................... 29

B. Wiring Diagrams .......................................................................................................... 30

1. KM-1800SAH .................................................................................................. 30

2. KM-1800SAH3 ....................................................................................................... 31

3. KM-1800SWH, KM-1800SRH ............................................................................... 32

4. KM-1800SWH3, KM-1800SRH3 ........................................................................... 33

C. Timing Chart ............................................................................................................... 34

D. Performance Data ....................................................................................................... 36

1. KM-1800SAH ......................................................................................................... 36

2. KM-1800SAH3 ....................................................................................................... 37

3. KM-1800SWH ........................................................................................................ 38

4. KM-1800SWH3 ...................................................................................................... 39

5. KM-1800SRH ........................................................................................................ 40

6. KM-1800SRH3 ...................................................................................................... 41

3

IV. Service Diagnosis ........................................................................................................... 42

A. No Ice Production ....................................................................................................... 42

B. Evaporator is Frozen Up ............................................................................................. 45

C. Low Ice Production ..................................................................................................... 46

D. Abnormal Ice ............................................................................................................... 46

E. Other ........................................................................................................................... 47

V. Removal and Replacement of Components .................................................................... 48

A. Service for Refrigerant Lines ...................................................................................... 48

1. Refrigerant Recovery ............................................................................................. 48

2. Evacuation and Recharge [R-404A] ...................................................................... 48

B. Brazing ........................................................................................................................ 49

C. Removal and Replacement of Compressor ................................................................ 49

D. Removal and Replacement of Drier ............................................................................ 50

E. Removal and Replacement of Expansion Valve .......................................................... 51

F. Removal and Replacement of Hot Gas Valve, Line Valve and Gas Valve .................... 52

G. Removal and Replacement of Evaporator .................................................................. 53

H. Removal and Replacement of Thermistor ................................................................... 53

I. Removal and Replacement of Fan Motor ..................................................................... 54

J. Removal and Replacement of Water Valve .................................................................. 54

K. Removal and Replacement of Pump Motor ................................................................ 55

L. Removal and Replacement of Spray Tubes ................................................................. 55

M. Removal and Replacement of Water Regulating Valve – Water-Cooled Model Only . 56

N. Adjustment Of Water Regulating Valve – Water-Cooled Model Only .......................... 57

O. Removal and Replacement of Condensing Pressure Regulator (C.P.R.) –

Remote Air-Cooled Model Only .................................................................................. 58

VI. Cleaning and Maintenance ............................................................................................. 59

A. Preparing the Icemaker for Long Storage ................................................................... 59

B. Cleaning and Sanitizing Instructions ........................................................................... 60

1. Cleaning Procedure ............................................................................................... 61

2. Sanitizing Procedure - Following Cleaning Procedure .......................................... 62

C. Maintenance ............................................................................................................... 63

4

I. Speciﬁcations

AC SUPPLY VOLTAGE 208-230/60/1 (3 wire with neutral for 115V) AMPERAGE 18 A ( 5 Min. Freeze AT 104°F / WT 80°F) MINIMUM CIRCUIT AMPACITY 30 A MAXIMUM FUSE SIZE 30 A APPROXIMATE ICE PRODUCTION Ambient WATER TEMP. (°F) PER 24 HR. Temp.(°F) 50 70 90 lbs./day ( kg/day ) 70 *1756 (797) 1685 (764) 1589 (721) Reference without *marks 80 1702 (772) 1592 (722) 1496 (679)

90 1685 (764) *1514 (687) 1416 (642)

100 1579 (716) 1491 (676) 1326 (601) SHAPE OF ICE Crescent Cube ICE PRODUCTION PER CYCLE 42.9lbs. (19.4 kg) 2160 pcs. APPROXIMATE STORAGE CAPACITY N/A ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F ELECTRIC W (kWH/100 lbs.) 2979 (4.9) 2780 (3.8) WATER gal./24HR (gal./100 lbs.) 348 (23.0) 680 (38.7) EXTERIOR DIMENSIONS (WxDxH) 48" x 27 3/8" x 36 7/16" (1219 x 695 x 925 mm) EXTERIOR FINISH Stainless Steel, Galvanized Steel (Rear) WEIGHT Net 344 lbs. ( 156 kg ), Shipping 440 lbs. ( 200 kg ) CONNECTIONS - ELECTRIC Permanent - Connection

- WATER SUPPLY Inlet 1/2" FPT

- DRAIN Outlet 3/4" FPT

- CONDENSATE DRAIN 3/8" OD Pipe CUBE CONTROL SYSTEM Float Switch HARVESTING CONTROL SYSTEM Hot Gas and Water, Thermistor and Timer ICE MAKING WATER CONTROL Timer Controlled. Overflow Pipe COOLING WATER CONTROL N/A BIN CONTROL SYSTEM Thermostat COMPRESSOR Hermetic, Model CS18K6E-PFV-237 CONDENSER Air-cooled, Fin and Tube Type EVAPORATOR Vertical type, Stainless Steel and Copper REFRIGERANT CONTROL Thermostatic Expansion Valve REFRIGERANT CHARGE R-404A, 4 lb. 7 oz. ( 2000 g ) 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 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-1800SAH (air-cooled)

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

5

2. KM-1800SAH3 (air-cooled, 3 phase)

AC SUPPLY VOLTAGE 208-230/60/3 AMPERAGE 11 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 *1757 (797) 1683 (764) 1597 (724) Reference without *marks 80 1701 (772) 1587 (720) 1507 (684)

90 1683 (764) *1506 (683) 1422 (645)

100 1579 (716) 1486 (674) 1344 (610) SHAPE OF ICE Crescent Cube ICE PRODUCTION PER CYCLE 42.9 lbs. (19.4 kg) 2160 pcs. APPROXIMATE STORAGE CAPACITY N/A ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F ELECTRIC W (kWH/100 lbs.) 2949 (4.7) 2562 (3.5) WATER gal./24HR (gal./100 lbs.) 328 (21.8) 694 (39.5) EXTERIOR DIMENSIONS (WxDxH) 48" x 27 3/8" x 36 7/16" (1219 x 695 x 925 mm) EXTERIOR FINISH Stainless Steel, Galvanized Steel (Rear) WEIGHT Net 344 lbs. ( 156 kg ), Shipping 440 lbs. ( 200 kg ) CONNECTIONS - ELECTRIC Permanent - Connection

- WATER SUPPLY Inlet 1/2" FPT

- DRAIN Outlet 3/4" FPT

- CONDENSATE DRAIN 3/8" OD Pipe CUBE CONTROL SYSTEM Float Switch HARVESTING CONTROL SYSTEM Hot Gas and Water, Thermistor and Timer ICE MAKING WATER CONTROL Timer Controlled. Overflow Pipe COOLING WATER CONTROL N/A BIN CONTROL SYSTEM Thermostat COMPRESSOR Hermetic, Model CS18K6E-PFV-237 CONDENSER Air-cooled, Fin and Tube Type EVAPORATOR Vertical type, Stainless Steel and Copper REFRIGERANT CONTROL Thermostatic Expansion Valve REFRIGERANT CHARGE R-404A, 4 lb. 7 oz. ( 2000 g ) 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 OPERATING CONDITIONS VOLTAGE RANGE 187 - 253 V

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

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

6

3. KM-1800SWH (water-cooled)

No Data Available

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

7

4. KM-1800SWH3 (water-cooled, 3 phase)

No Data Available

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

8

5. KM-1800SRH (remote air-cooled)

SPECIFICATION NO. 05A001 ISSUED: 8/26/2005

ITEM: HOSHIZAKI STACKABLE CRESCENT CUBER MODEL: KM-1800SRH

AC SUPPLY VOLTAGE 208-230/60/1 (3 wire with neutral for 115V) AMPERAGE 16.5 A ( 5 Min. Freeze AT 104°F / WT 80°F) MINIMUM CIRCUIT AMPACITY 30 A MAXIMUM FUSE SIZE 30 A APPROXIMATE ICE PRODUCTION Ambient WATER TEMP. (°F) PER 24 HR. Temp.(°F) 50 70 90 lbs./day ( kg/day ) 70 *1817 (824) 1768 (802) 1643 (745) Reference without *marks 80 1780 (807) 1704 (773) 1546 (701)

90 1768 (802) *1651 (749) 1504 (682)

100 1723 (782) 1617 (733) 1369 (621) SHAPE OF ICE Crescent Cube ICE PRODUCTION PER CYCLE 47.8 lbs. (21.7 kg) 2160 pcs. APPROXIMATE STORAGE CAPACITY N/A ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F ELECTRIC W (kWH/100 lbs.) 2890(4.2) 2730(3.6) WATER gal./24HR (gal./100 lbs.) 439(26.6) 721(39.7) EXTERIOR DIMENSIONS (WxDxH) 48" x 27 3/8" x 36 7/16" (1219 x 695 x 925 mm) EXTERIOR FINISH Stainless Steel, Galvanized Steel (Rear) WEIGHT Net 344 lbs. (156 kg), Shipping 440 lbs. (200 kg) CONNECTIONS - ELECTRIC Permanent - Connection

- WATER SUPPLY Inlet 1/2" FPT

- DRAIN Outlet 3/4" FPT

- CONDENSATE DRAIN 3/8" OD Pipe CUBE CONTROL SYSTEM Float Switch HARVESTING CONTROL SYSTEM Hot Gas and Water, Thermistor and Timer ICE MAKING WATER CONTROL Timer Controlled. Overflow Pipe COOLING WATER CONTROL N/A BIN CONTROL SYSTEM Thermostat COMPRESSOR Hermetic, Model CS18K6E-PFV CONDENSER Air-Cooled Remote, Condenser Unit URC-20F EVAPORATOR Vertical type, Stainless Steel and Copper REFRIGERANT CONTROL Thermostatic Expansion Valve

Condensing Pressure Regulator on URC-20F (210 PSI Set)

REFRIGERANT CHARGE R-404A, 15 lb. 7.0 oz. (7,000g)

(Icemaker 7 lbs. 12.0 oz. Cond. Unit 7 lb. 11.0 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

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

9

6. KM-1800SRH3 (remote air-cooled, 3 phase)

SPECIFICATION NO. 05A002 ISSUED: 10/3/2005

ITEM: HOSHIZAKI STACKABLE CRESCENT CUBER MODEL: KM-1800SRH3

AC SUPPLY VOLTAGE 208-230/60/3 AMPERAGE 10.9 A ( 5 Min. Freeze AT 104°F / WT 80°F) MINIMUM CIRCUIT AMPACITY 20 A MAXIMUM FUSE SIZE 20 A APPROXIMATE ICE PRODUCTION Ambient WATER TEMP. (°F) PER 24 HR. Temp.(°F) 50 70 90 lbs./day ( kg/day ) 70 *1775 (805) 1722 (781) 1618 (734) Reference without *marks 80 1735 (787) 1653 (750) 1531 (695)

90 1722 (781) *1595 (723) 1479 (671)

100 1691 (767) 1568 (711) 1372 (622) SHAPE OF ICE Crescent Cube ICE PRODUCTION PER CYCLE 47.7 lbs. (21.7 kg) 2160 pcs. APPROXIMATE STORAGE CAPACITY N/A ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F ELECTRIC W (kWH/100 lbs.) 2860(4.3) 2660(3.6) WATER gal./24HR (gal./100 lbs.) 456(28.6) 774(43.6) EXTERIOR DIMENSIONS (WxDxH) 48" x 27 3/8" x 36 7/16" (1219 x 695 x 925 mm) EXTERIOR FINISH Stainless Steel, Galvanized Steel (Rear) WEIGHT Net 344 lbs. (156 kg), Shipping 440 lbs. (200 kg) CONNECTIONS - ELECTRIC Permanent - Connection

- WATER SUPPLY Inlet 1/2" FPT

- DRAIN Outlet 3/4" FPT

- CONDENSATE DRAIN 3/8" OD Pipe CUBE CONTROL SYSTEM Float Switch HARVESTING CONTROL SYSTEM Hot Gas and Water, Thermistor and Timer ICE MAKING WATER CONTROL Timer Controlled. Overflow Pipe COOLING WATER CONTROL N/A BIN CONTROL SYSTEM Thermostat COMPRESSOR Hermetic, Model CS18K6E-TF5 CONDENSER Air-Cooled Remote, Condenser Unit URC-20F EVAPORATOR Vertical type, Stainless Steel and Copper REFRIGERANT CONTROL Thermostatic Expansion Valve

Condensing Pressure Regulator on URC-20F (210 PSI Set)

REFRIGERANT CHARGE R-404A, 15 lb. 7.0 oz. (7,000g)

(Icemaker 7 lbs. 12.0 oz. Cond. Unit 7 lb. 11.0 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

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

10

B. Condensing Unit

1. URC-20F

11

SPECIFICATIONS

MODEL: URC-20F EXTERIOR Galvanized Steel DIMENSIONS (W × D × H) 46 - 3/8” × 15 - 11/16” × 25 - 15/16”

(1178 × 398 × 659 mm) REFRIGERANT CHARGE R404A 7 lbs. 11 oz. (3500 g) WEIGHT Net 104 lbs. (47 kg)

Shipping 150 lbs. (52 kg) CONNECTIONS

REFRIGERANT One Shot Couplings (Parker)

ELECTRICAL Permanent Connection CONDENSER Air-Cooled HEAD PRESSURE CONTROL AMBIENT CONDITION Min. -20°F to Max. +122°F

Condensing Pressure Regulator

(-29°C to +50°C) Outdoor Use

12

II. General Information

A. Construction

1. KM-1800SAH/3

Spray Tubes

Water Supply Inlet

Water Valve

Hot Gas Valve

Junction Box

Check Valves (3)

Water Pump

Float Switch

Expansion Valves (3)

Interlock Switch

Compressor

Control Switch

Bin Control Thermostat

Control Box

Condenser

Condenser Fan Motors (2)

Drier

Line Valve

Capacitor Box (KM-1800SAH)

Transformer Box (KM-1800SAH3)

13

2. KM-1800SWH/3

Evaporator Spray Tubes Water Valve

Expansion Valves (3) Water Supply Inlet

Check Valves (3)

Hot Gas Valve

Junction Box

Control Box

Water-cooled Condenser

Line Valve

Water Regulator Water Pump

Float Switch

Cleaning Valve

Drier Compressor

Control Switch Bin Control Thermostat

Capacitor Box (KM-1800SWH)

Transformer Box (KM-1800SWH3)

14

3. KM-1800SRH/3

Evaporator Spray Tubes Water Valve

Expansion Valves (3) Water Supply Inlet

Check Valves (3)

Hot Gas Valve

Junction Box

Control Box

Receiver Tank

Water Pump Line Valve Float Switch

Cleaning Valve Drier

Compressor

Control Switch Bin Control Thermostat

Capacitor Box (KM-1800SRH)

Transformer Box (KM-1800SRH3)

15

B. Controller Board

1. Solid-State Control

• A HOSHIZAKI exclusive solid-state control is employed in KM-1800SAH/3, KM-1800SWH/3 and KM-1800SRH/3 Stackable Crescent Cubers.

• A printed circuit board (hereafter called "controller board") includes a stable and high quality control system.

• All models are pretested and factory-adjusted.

2. 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 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.

Controller Board

Part Number Type

2A1410-01 HOS-001A (Control Products - 10 Pin)

Features of Control Products "E" Controller Board

a) 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.

b) 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 (9°C) 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.

16

c) High Temperature Safety - 127 ± 7°F (53 ± 4°C)

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 (9°C) 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 (53 ± 4°C) the thermistor operates the high temperature safety. This high temperature safety shuts down the circuit and the icemaker automatically stops. To reset the safety, turn the power off and back on again. 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.

d) 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 models, if the water is shut off, the unit is protected by the high pressure switch.

e) High Voltage Cut-out

The maximum allowable supply voltage of this icemaker is limited by the high voltage cut-out. If miswiring (especially on single phase 3 wire models) causes excessive voltage on the controller board, the high voltage cut-out 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.

17

f) 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:

Sequence Step LED

Min. Max. Avg.

1 Minute Fill Cycle

Harvest Cycle 1, 4, and 2 2 minutes 20 minutes 3 to 5 minutes Freeze Cycle

Reverse Pump Out

{L

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

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

No. of Beeps

(every 3 sec.)

1 High Evaporator Temp.

(temperature > 127°F) (53°C)

2 Defrost Backup Timer

(defrost > 20 min.)

4 60 seconds

1 5 minutes 60 minutes 30 to 35 minutes

1, 3, and 2 10 seconds 20 seconds factory setting

Type of Alarm

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

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

Time LEDs are Lit

Notes

3 Freeze Backup Timer

(freeze > 60 min. for KM-1800SWH/3; freeze > 70 min. for KM-1800SAH/3 or KM-1800SRH/3)

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

6 Low Voltage

(92Vac or less)

7 High Voltage

(control voltage > 147Vac ±5%)

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. S3 should remain in the "OFF" position for normal operation.

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

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

18

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. 7 & 8 must remain in the OFF position.

(Control Products HOS-001A Board)

19

Hoshizaki America KM-1800SAH Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

A. Icemaker

1. KM-1800SAH (air-cooled)

2. KM-1800SAH3 (air-cooled, 3 phase)

3. KM-1800SWH (water-cooled)

4. KM-1800SWH3 (water-cooled, 3 phase)

5. KM-1800SRH (remote air-cooled)

6. KM-1800SRH3 (remote air-cooled, 3 phase)

B. Condensing Unit

1. URC-20F

II. General Information

A. Construction

1. KM-1800SAH/3

2. KM-1800SWH/3

3. KM-1800SRH/3

B. Controller Board

1. Solid-State Control

2. Controller Board