Hoshizaki Serenity Series Service Manual
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Hoshizaki Serenity Series Service Manual

Hoshizaki Serenity Series Service Manual

Modular crescent cuber including condensing unit model srk-10j
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Service Manual
Modular Crescent Cuber
Serenity Series
Models
KMS-822MLJ
Including
Condensing Unit Model SRK-10J
hoshizakiamerica.com
Number: 73228
Issued: 8-9-2018
Revised: 10-19-2018

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Summary of Contents for Hoshizaki Serenity Series

  • Page 1 Service Manual Modular Crescent Cuber Serenity Series Models KMS-822MLJ Including Condensing Unit Model SRK-10J hoshizakiamerica.com Number: 73228 Issued: 8-9-2018 Revised: 10-19-2018...
  • 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 VII. Disposal ......................... 49 VIII. Technical Information ....................50 A. Specification and Performance Data Sheets ............... 50 1. KMS-822MLJ with SRK-10J ................... 50 2. SRK-10J ........................ 51 B. Wiring Diagrams ......................52 1. Wire Harness Connections ..................52 2. KMS-822MLJ with SRK-10J .................. 53...

  • 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 Inlet Water Valve Evaporator Hot Gas Valve Thermostatic Expansion Valve High-Side Service Valve Splash Guard Drier Control Box Control Board Thermistor Drain Valve Low-Side Service Valve Liquid Line Valve Float Switch Insulation Pump Motor Cleaning Valve...

  • Page 8: Condensing Unit

    2. Condensing Unit Condenser Discharge Line Thermostat Liquid Line Valve High-Pressure Switch Hot Gas Valve Magnetic Fan Blade Contactor Fan Motor Headmaster Start Relay Fuse Fan Motor Capacitor Control Box Capacitors Compressor Crankcase Heater Receiver Suction Line Shutoff Valve Accumulator Liquid Line Shutoff Valve Model Shown: SRK-10J...

  • 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 1. Operation Flow Chart...

  • Page 11: Shutdown Flow Chart

    2. Shutdown Flow Chart...

  • Page 12: 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 13 3) Power On: Turn on the power supply, then move the control switch to the "ICE" position. A 5-sec. delay occurs. CB red "POWER OK" LED and CB green "BC CLOSED" LED turn on. If CB yellow "BC OPEN" LED is on (indicating a full bin), check BC. Move ice away from BC actuator paddle.
  • Page 14 4) 1-Min. Fill Cycle – LED 4 is on. WV and X11 relay energize. After 1 min., CB checks for a closed FS. If FS is closed, the harvest cycle begins. If harvest cycle begins (Comp, HGVs, and FMR energized), continue to step 5a. If FS is open, WV remains energized until FS closes (low water safety protection during initial start up and at the end of each harvest).
  • Page 15 5b) Harvest Pump Timer – LEDs 1, 3, and 2 are on. When the thermistor reaches 48°F (9°C), CB reads 3.9 kΩ from the thermistor and turns harvest termination over to the harvest timer (S4 dip switch 1 & 2 and S5 dip switch 4). When WV de-energizes, LED 4 turns off, X11 relay de-energizes and LED 3 turns on.
  • Page 16 a) Freeze Cycle Diagnosis: Confirm Comp, FMR, and PM continue. Confirm that LLVs energize. Next, confirm HGVs, X10 and X12 relays de-energize. During the first 5 min. of freeze, confirm evaporator is cooling. If not, confirm WV de-energized (not leaking by), HGVs de-energized (not bypassing), LLVs energizes, TXV and HM operate correctly, Comp is efficient, and refrigerant charge is correct.
  • Page 17 g) Freeze Termination Diagnosis: After 5 min. in freeze, disconnect CB K5 FS connector. 15 sec. later appliance should switch out of the freeze cycle (15 second delay after FS opens before terminating the freeze cycle). If appliance remains in freeze longer than 15 sec.
  • Page 18 b) CB Diagnosis: Confirm LLVs de-energize. If LLVs are energized with LEDs 1, 3, and 2 on, replace CB. If PM does not stop and restart and DV does not energize, check that CB LEDs 1, 3, and 2 are on. If not, replace CB. If LEDs 1, 3, and 2 are on and X12 relay is not energized, check for 115VAC at CB K1 #5 (DBU) to neutral (W).
  • Page 19 2. Shutdown Diagnosis When BC is activated (BC open), the yellow "BC OPEN" LED comes on. The icemaker then shuts down as outlined in the table below. Cycle at Bin Shutdown Control Activation Fill Cycle 15 seconds after activation. Harvest Cycle At the end of the harvest cycle, or up to 15 seconds into the freeze cycle if activated at the end of the harvest cycle.

  • Page 20: Control Board Check

    C. Control Board Check Before replacing 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 21 4) To verify voltage output from CB to the components, slide the CB K1 connector out far enough to allow multimeter lead contact. With the icemaker in the cycle to be tested, check output voltage from the corresponding pin on CB K1 connector to a neutral (W). If output voltage is not found and the appropriate LED is on, replace CB.

  • Page 22: Bin Control Check And Cleaning

    D. Bin Control Check and Cleaning This unit uses a BC with a lever-actuated proximity switch to control the ice level in the storage bin. No adjustment is required. BC is connected to CB red K4 connector. When calling for ice, BC proximity switch is closed (green "BC CLOSED" LED on). When BC actuator paddle is engaged, BC proximity switch opens (yellow "BC OPEN"...
  • Page 23 8) If the control box was removed, replace it in its correct position. 9) Reconnect the red connector to CB RED K4 connector, then move the control switch to the "ICE" position. 10) Turn on the power supply. 11) Check that the green "BC CLOSED" LED on CB is on. 12) Allow the unit to cycle on.

  • Page 24: Float Switch Check And Cleaning

    Remove the bin control assembly. 6) Remove BC from the extension bracket. See Fig. 3. 7) Wipe down BC assembly with a mixture of 1 part Hoshizaki "Scale Away" and 25 parts warm water. Rinse the parts thoroughly with clean water.
  • Page 25 1. Float Switch Check To check FS, 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 insulation panel. Remove the Overflow Cap splash guard, then remove cube guide B, and cube guide A.

  • Page 26: Thermistor Check

    Be careful not to bend the retainer rod excessively when removing it. 8) Wipe down the float switch assembly's housing, shaft, float, and retainer rod with a mixture of 1 part Hoshizaki "Scale Away" and 25 parts warm water. Clean the inside of the rubber boot and hose with cleaning solution.

  • Page 27: Control Switch

    3) Remove the control box cover. 4) Remove the thermistor from the refrigerant tubing. 5) Immerse the thermistor sensor portion in a glass containing ice and water for 2 or 3 min. 6) Disconnect the thermistor connector from CB K3 connector and check the resistance between thermistor leads.
  • Page 28 steps in "II.C. Control Board Check." 1. No Ice Production No Ice Production - Possible Cause 1. Power Supply a) Off, blown fuse, or tripped breaker. b) Not within specifications. 2. Water Supply a) Water supply off or improper water pressure. b) External water filters clogged.
  • Page 29 2. Freeze-Up Defrost and clean the icemaker prior to diagnosing freeze-up. Fill out a freeze-up checklist. See "II.I. Freeze Up Check List," the Hoshizaki Technician's Pocket Guide or contact your local distributor for a copy of the freeze-up checklist. Freeze-Up - Possible Cause Harvest Cycle 1.
  • Page 30 Freeze-Up - Possible Cause 8. Control Board a) Harvest timer (S4 dip switch 1 & 2) set too short. See "III. Controls and b) Harvest pump timer (S4 dip switch 7) not in factory default position. Adjustments" and "II.C. Control c) Defective.
  • Page 31 3. Low Ice Production Low Ice Production - Possible Cause Long Harvest Cycle 1. Evaporator a) Scaled up. 2. Spray Tubes, Spray Guides, and a) Dirty. Splash Guard b) Out of position. 3. Refrigerant Charge a) Low. 4. Water Supply a) Low water pressure.

  • Page 32: Freeze-Up Check List

    I. Freeze-Up Check List Freeze-Up Check List Please Complete When Diagnosing a Freeze-Up, Refrigerant Leak, or Low Charge Technical Support Fax #: 770-487-3360 Make Copies And Use As Needed Model #___________________________ Serial # ____________________Install Date____________Freeze-Up Date___________ List model and manufacture of bin or dispenser__________________________. Date appliance was last cleaned:__________.

  • Page 33: Controls And Adjustments

    III. Controls and Adjustments • A Hoshizaki exclusive control board is employed in the KMS-822MLJ 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 34: Control Board Layout

    A. Control Board Layout "J" Control Board • Bin Control Switch Closed LED (green) • "OUTPUT TEST" Button • S4 Dip Switch • "ALARM RESET" Button (used to test relays on control board) • Bin Control Switch • K3 (white) Connector Open LED (yellow) Thermistor (harvest control and...

  • Page 35: Led Lights And Audible Alarm Safeties

    Correct green LED lighting sequence is 1, 4, 3, 2. Components (e.g., compressor) cycle during test. Following test, icemaker resumes operation. Dip switches must be adjusted per unit’s service manual or Hoshizaki Technical Support recommendation. S4 dip switch 8 must remain off.

  • Page 36: 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 37: Harvest Timer (S4 Dip Switch 1 & 2)

    Before changing this setting, contact Hoshizaki Technical Support at 1-800-233-1940 for recommendations. Keep in mind that setting the harvest timer to a longer setting decreases 24-hour production.

  • Page 38: Pump-Out Frequency Control (S4 Dip Switch 5)

    4. Pump-Out Frequency Control (S4 dip switch 5) The pump-out frequency control is factory set to drain the water tank every 10 cycles. Generally no adjustment is required. However, where water quality is bad and the icemaker needs a pump-out more often, the pump-out frequency can be adjusted. The pump-out frequency control can be set to have a pump-out occur every cycle, or every 10 cycles.

  • Page 39: Harvest Pump Time (Harvest Assist) (S4 Dip Switch 7)

    6. Harvest Pump Time (Harvest Assist) (S4 dip switch 7) NOTICE Factory set for proper operation. Do not adjust. Adjustment outside of the factory default setting may result in damage to the appliance. a) Harvest Pump Time (Harvest Assist) Depending on S4 dip switch 7 setting, the pump motor either stays off or is energized during the last seconds of the harvest cycle.

  • Page 40: Freeze Timer (S4 Dip Switch 9 & 10)

    In this case, see "II.H.3. Low Ice Production" for possible solutions. The freeze timer is factory set and no adjustment is required. Before changing this setting, contact Hoshizaki Technical Support at 1-800-233-1940 for recommendations. S4 Dip Switch Setting Time (min.)

  • Page 41: Refill Counter (S5 Dip Switch 2 And 3)

    10. Refill Counter (S5 dip switch 2 and 3) NOTICE Do not adjust. These must be left in the factory default position or the icemaker will not operate correctly. S5 Dip Switch Setting Refill Counter No. 2 No. 3 1 refill 9 refills 10 refills 11.

  • Page 42: 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 43 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 44 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 45: 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 46: 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 47: 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 48 2. Remove the water from the water tank: 1) Turn off the power supply. 2) Remove the front panel, then move the control switch to the "OFF" position. 3) Remove the insulation panel. Remove the splash guard, cube guide B, then remove cube guide A.

  • Page 49: 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 50: Technical Information

    VIII. Technical Information We reserve the right to make changes in specifications and design without prior notice. A. Specification and Performance Data Sheets Pressure data is recorded at 5 min. into freezing cycle. The data not in bold should be used for reference only.

  • Page 51: Srk-10J

    2. SRK-10J Specification Sheet AC SUPPLY VOLTAGE 208-230/60/1 ( 3 wire with neutral for 115V ) (115VAC Supplied to KMS via Factory Wire Harness) AMPERAGE 11.9 A ( 5 Min. Freeze AT 104°F / WT 80°F ) MINIMUM CIRCUIT AMPACITY 20 A MAXIMUM FUSE SIZE 20 A...

  • Page 52: Wiring Diagrams

    B. Wiring Diagrams 1. Wire Harness Connections...

  • Page 53: Kms-822Mlj With Srk-10J

    2. KMS-822MLJ with SRK-10J...

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