Hoshizaki KMS-1122MLH Service Manual
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Hoshizaki KMS-1122MLH Service Manual

Hoshizaki KMS-1122MLH Service Manual

Modular crescent cuber serenity series
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Hoshizaki
Hoshizaki America, Inc.
"A Superior Degree
of Reliability"
www.hoshizaki.com
Modular Crescent Cuber
Serenity Series
Model
KMS-1122MLH with SRK-12H/3
SERVICE MANUAL
Number: 73194
Issued: 4-4-2013

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Summary of Contents for Hoshizaki KMS-1122MLH

  • Page 1 Hoshizaki Hoshizaki America, Inc. Modular Crescent Cuber Serenity Series Model KMS-1122MLH with SRK-12H/3 SERVICE MANUAL “A Superior Degree of Reliability” www.hoshizaki.com Number: 73194 Issued: 4-4-2013...
  • Page 2 Hoshizaki provides this manual primarily to assist qualified service technicians in the service of the appliance. Should the reader have any questions or concerns which have not been satisfactorily addressed, please call, send an e-mail message, or write to the Hoshizaki Technical Support Department for assistance. Phone: 1-800-233-1940; (770) 487-2331 Fax: 1-800-843-1056;...

  • Page 3: Table Of Contents

    IMPORTANT This manual should be read carefully before the appliance is serviced. Read the warnings and guidelines contained in this manual carefully as they provide essential information for the continued safe use, service, and maintenance of the appliance. Retain this manual for any further reference that may be necessary. CONTENTS Important Safety Information ....................
  • Page 4 VIII. Technical Information ....................41 A. Specification Sheets....................41 1. KMS-1122MLH with SRK-12H ................41 2. KMS-1122MLH with SRK-12H3 ................42 3. SRK-12H........................ 43 4. SRK-12H3......................44 B. Performance Data ....................... 45 1. KMS-1122MLH with SRK-12H ................45 2. KMS-1122MLH with SRK-12H3 ................46 C.

  • Page 5: Important Safety Information

    Important Safety Information Throughout this manual, notices appear to bring your attention to situations which could result in death, serious injury, damage to the appliance, or damage to property. WARNING Indicates a hazardous situation which could result in death or serious injury.
  • Page 6 WARNING, continued For KMS • Risk of electric shock. Control switch in "OFF" position does not de-energize all loads. • Power supply and ground connection are supplied from the SRK remote condensing unit via the wire harness provided. Do not connect the wire harness leads to an external power source.

  • Page 7: Construction And Water/Refrigeration Circuit Diagrams

    I. Construction and Water/Refrigeration Circuit Diagrams A. Construction 1. Icemaker Hot Gas Valve Thermostatic Expansion Valve Evaporator Inlet Water Valve X12 Relay Cleaning Valve (drain valve relay) X10 Relay (pump motor relay) Thermistor X11 Relay Drain Valve (inlet water valve relay) Drier Control Board Pump Motor...

  • Page 8: Condensing Unit

    2. Condensing Unit Condenser Liquid Line Valve Hot Gas Valve Start Relay Headmaster Shut-off Valve (Low Side) Fuse Capacitors Magnetic Contactor Control Box Junction Box Fan Motors and Fan Blades Shut-off Valve (High Side) Crankcase Heater Compressor Receiver Accumulator Discharge Line Thermostat Model Shown: SRK-12H...

  • Page 9: Water/Refrigeration Circuit Diagram

    B. Water/Refrigeration Circuit Diagram...

  • Page 10: Sequence Of Operation And Service Diagnosis

    II. Sequence of Operation and Service Diagnosis A. Sequence of Operation Flow Chart...

  • Page 11: Service Diagnosis

    B. Service Diagnosis WARNING • The appliance should be diagnosed and repaired only by qualified service personnel to reduce the risk of death, electric shock, serious injury, or fire. • Risk of electric shock. Use extreme caution and exercise safe electrical practices. •...
  • Page 12 3) Power On: Turn on the power supply, then move the control switch (KMS) to the "ICE" position. A 5-sec. delay occurs. CB red "POWER OK" LED and green "BC CLOSED" LED turn on. Note: • CB red "POWER" LED remains on unless the 10.5VAC power supply is interrupted (K2 connector).
  • Page 13 5) Initial Harvest Cycle – LEDs 1, 4, and 2 are on. WV and X11 relay continue. Comp, FMRs, HGVs, and X10 relay 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 3.9 kΩ...
  • Page 14 6) Freeze Cycle – LED 1 is on. Comp, FMRs, and PM continue. LLVs energize. HGVs and X10 relay de-energize. The appliance is held in freeze by a 5-min. short cycle protection timer. When FS opens, the freeze cycle terminates. Note: CB K1 connector pin #5 (DBU) de-energizes and K1 connector pin #4 (R) energizes to prevent PM interruption.
  • Page 15 7) Pump-Out Cycle – LEDs 1, 3, and 2 are on (10/20 second pump-out) – At the factory setting the 1st pump-out occurs after the 11th freeze cycle, then every 10th cycle thereafter. See the table below. S4 Dip Switch Setting Pump-Out 1st Pump-Out Frequency...

  • Page 16: Control Board Check

    C. Control Board Check Before replacing a CB 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 CB is in alarm (beeping), press the "ALARM RESET" button on CB while CB is beeping.

  • Page 17: Bin Control Check

    D. Bin Control Check To check BC, follow the steps below. NOTICE When the ambient temperature is below 45°F (7°C), BC switch opens and shuts down the appliance even if the ice storage bin is empty. When BC is set in the prohibited range, the appliance operates continuously even if the ice storage bin is filled with ice.
  • Page 18 7) Remove the control box cover, then disconnect FS connector from CB black K5 connector. 8) Check for continuity across FS leads. With the water tank empty, FS should be open. If open, continue to step 10. If closed, follow the steps in "II.E.2. Float Switch Cleaning." After cleaning FS, check it again.
  • Page 19 Be careful not to bend the retainer rod excessively when removing it. 9) Wipe down FS assembly's housing, shaft, float, and retainer rod with a mixture of 1 part Hoshizaki "Scale Away" and 25 parts warm water. Rinse the parts thoroughly with clean water.

  • Page 20: Thermistor Check

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

  • Page 21: Diagnostic Tables

    G. Diagnostic Tables Before consulting the diagnostic tables, check for correct installation, proper voltage per nameplate, and adequate water pressure (10 to 113 PSIG). Check control board using the steps in "II.C. Control Board Check." 1. No Ice Production No Ice Production - Possible Cause 1.
  • Page 22 2. Freeze-Up Defrost and clean the icemaker prior to diagnosing freeze-up. Fill out a freeze-up checklist. The freeze-up checklist can be found in the Hoshizaki Technician's Pocket Guide or contact your local distributor for a copy of the freeze-up checklist.
  • Page 23 Freeze-Up - Possible Cause 6. Float Switch a) Float does not move freely. See "II.E. Float Switch Check b) Defective. and Cleaning" 7. Refrigerant Charge a) Low. 8. Control Board a) Harvest timer (S4 dip switch 1 & 2) set too short. See "III.

  • Page 24: Low Ice Production

    3. Low Ice Production Low Ice Production - Possible Cause Long Harvest Cycle 1. Evaporator a) Scaled up. 2. Spray Tubes and/or Spray a) Dirty. Guides b) Out of position. 3. Refrigerant Charge a) Low. 4. Water Supply a) Low water pressure. b) External water filters clogged.

  • Page 25: Controls And Adjustments

    III. Controls and Adjustments • A Hoshizaki exclusive control board is employed in the KMS-1122MLH series. • All models are pretested and factory adjusted. • For a control board check procedure, see "II.C. Control Board Check." NOTICE • Fragile, handle very carefully.

  • Page 26: Control Board Layout

    A. Control Board Layout "G" Control Board • S4 Dip Switch • Bin Control Switch • "ALARM RESET" Button Closed LED (green) • "OUTPUT TEST" Button On with K4 jumper in place • K7 Connector ALARM RESET OUTPUT TEST Factory Use Only •...

  • Page 27: Led Lights And Audible Alarm Safeties

    B. LED Lights and Audible Alarm Safeties At startup, a 5-sec. delay occurs while CB conducts an internal timer check. A beep occurs when the control switch (KMS) is moved to the "ICE" position. The red "POWER OK" LED indicates proper control voltage and remains on unless a control voltage problem occurs.

  • Page 28: Settings And Adjustments

    C. Settings and Adjustments NOTICE 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. 1. Default Dip Switch Settings The dip switches are factory-adjusted to the following positions: S4 Dip Switch Dip Switch No.

  • Page 29: Harvest Timer (S4 Dip Switch 1 & 2)

    Before changing this setting, contact your local Hoshizaki distributor or Hoshizaki Technical Support for recommendations. Keep in mind that setting the harvest timer to a longer setting decreases 24-hr production.

  • Page 30: Pump-Out Frequency Control (S4 Dip Switch 5 & 6)

    4. Pump-Out Frequency Control (S4 dip switch 5 & 6) The pump-out frequency control is factory-adjusted to drain the water tank every 10 cycles, and generally no adjustment is required. However, where water quality is bad and the appliance needs a more frequent pump-out, the pump-out frequency can be adjusted as shown in the table below.

  • Page 31: Freeze Timer (S4 Dip Switch 9 & 10)

    (upper or lower) the control board monitors for refill initiation during the freeze cycle. The refill counter (S5 dip switch 2 through 5) determines the number of refills. The KMS-1122MLH uses a single float switch and does not refill during the freeze cycle. S5 Dip Switch Setting...

  • Page 32: Refill Counter (S5 Dip Switch 2 Through 5)

    Do not adjust. These must be left in the factory default position or the appliance will not operate correctly. Factory set. S5 dip switch 2 through 5 allows for refills during the freeze cycle. The KMS-1122MLH does not refill. Do not adjust. S5 Dip Switch Setting No. of Refills No.

  • Page 33: Control Switch And Service Switch

    D. Control Switch and Service Switch 2 switches are used to control the operation of the appliance. These switches are referred to as the control switch and service switch. They are located on the KMS control box. 1. Control Switch The control switch has three positions: "OFF"...

  • Page 34: Refrigeration Circuit And Component Service Information

    IV. Refrigeration Circuit and Component Service Information WARNING • This appliance should be diagnosed and repaired only by qualified service personnel to reduce the risk of death, electric shock, serious injury, or fire. • Before servicing the KMS or SRK: Move the KMS control switch to the "OFF" position and turn off the power supply to the SRK condensing unit.
  • Page 35 2. Brazing WARNING • R-404A itself is not flammable at atmospheric pressure and temperatures up to 176°F (80°C). • R-404A itself is not explosive or poisonous. However, when exposed to high temperatures (open flames), R-404A can be decomposed to form hydrofluoric acid and carbonyl fluoride both of which are hazardous.
  • Page 36 Remember to loosen the connection and purge the air from the hose. For the required refrigerant charge, see the nameplate on the condensing unit or the rating label inside the icemaker. Hoshizaki recommends only virgin refrigerant or reclaimed refrigerant which meets ARI Standard 700 (latest edition) be used.

  • Page 37: Component Service Information

    • The thermistor should be at the 12 o'clock position on the tube. • Smoothly fill the recessed area of the thermistor holder with high thermal conductive type sealant. Hoshizaki America part number 4A0683-01 (Silicone Heat Sink Compound 10-8108 manufactured by GC Electronics), KE-4560 RTV (manufactured by ShinEtsu Silicones), or equivalent are recommended.

  • Page 38: Maintenance

    V. Maintenance The maintenance schedule below is a guideline. More frequent maintenance may be required depending on water quality, the appliance's environment, and local sanitation regulations WARNING • Only qualified service technicians should service the appliance. • To reduce the risk of electric shock, do not touch the control switch or service switch with damp hands •...

  • Page 39: Preparing The Appliance For Periods Of Non-Use

    VI. Preparing the Appliance for Periods of Non-Use NOTICE • When storing the appliance for an extended time or in sub-freezing temperatures, follow the instructions below to prevent damage. • To prevent damage to the water pump, do not operate the appliance with the control switch in the "SERVICE"...

  • Page 40: Disposal

    VII. Disposal The appliance contains refrigerant and must be disposed of in accordance with applicable national, state, and local codes and regulations. Refrigerant must be recovered by properly certified service personnel.

  • Page 41: Technical Information

    VIII. Technical Information A. Specification Sheets 1. KMS-1122MLH with SRK-12H AC SUPPLY VOLTAGE 115VAC Supplied by SRK-12H via Factory Supplied Wire Harness APPROXIMATE ICE PRODUCTION Ambient WATER TEMP. (°F) PER 24 HR. Temp.(°F) lb./day ( kg/day ) *1100 (499) 1066 (484)

  • Page 42: Kms-1122Mlh With Srk-12H3

    2. KMS-1122MLH with SRK-12H3 AC SUPPLY VOLTAGE 115VAC Supplied by SRK-12H3 via Factory Supplied Wire Harness APPROXIMATE ICE PRODUCTION Ambient WATER TEMP. (°F) PER 24 HR. Temp.(°F) lb./day (kg/day) *1120 (508) 1085 (492) 1016 (461) Reference without *marks 1093 (496)

  • Page 43: Srk-12H

    3. SRK-12H AC SUPPLY VOLTAGE 208-230/60/1 (115VAC Supplied to KMS via Factory Wire Harness) AMPERAGE 11.2 A ( 5 Min. Freeze AT 104°F / WT 80°F ) MINIMUM CIRCUIT AMPACITY 20 A MAXIMUM FUSE SIZE 20 A EXTERIOR DIMENSIONS (WxDxH) 50"...

  • Page 44: Srk-12H3

    4. SRK-12H3 AC SUPPLY VOLTAGE 208-230/60/3 (115VAC Supplied to KMS via Factory Wire Harness) AMPERAGE 10.5 A (5 Min. Freeze AT 104°F/WT 80°F) MINIMUM CIRCUIT AMPACITY 20 A MAXIMUM FUSE SIZE 20 A EXTERIOR DIMENSIONS (WxDxH) 50"x17"x28" (1270x432x711 mm) DIMENSIONS INCLUDING LEGS (WxDxH) 52-3/8"x19-1/2"x43"...

  • Page 45: Performance Data

    B. Performance Data 1. KMS-1122MLH with SRK-12H APPROXIMATE ICE WATER TEMP. (ºF/ºC) AMBIENT TEMP. PRODUCTION PER 24 HR. (ºF/ºC) 50/10 70/21 90/32 70/21 1100 1066 80/27 1074 1022 90/32 1066 lbs./day kg./day 100/38 1046 APPROXIMATE ELECTRIC 1830 70/21 1853 1884...

  • Page 46: Kms-1122Mlh With Srk-12H3

    2. KMS-1122MLH with SRK-12H3 APPROXIMATE ICE WATER TEMP. (ºF/ºC) AMBIENT TEMP. PRODUCTION PER 24 HR. (ºF/ºC) 50/10 70/21 90/32 70/21 1120 1085 1016 80/27 1093 1039 1000 90/32 1085 lbs./day kg./day 100/38 1064 APPROXIMATE ELECTRIC 70/21 1790 1828 1864 CONSUMPTION...

  • Page 47: Wiring Diagrams

    C. Wiring Diagrams 1. Wire Harness Connections...

  • Page 48: Kms-1122Mlh With Srk-12H

    2. KMS-1122MLH with SRK-12H...

  • Page 49: Kms-1122Mlh With Srk-12H3

    3. KMS-1122MLH with SRK-12H3...

This manual is also suitable for:

Srk-12hSrk-12h3

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