Hoshizaki KMS-1402MLJ Service Manual
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Hoshizaki KMS-1402MLJ Service Manual

Modular crescent cuber including condensing unit models hoshizaki srk-15j; hoshizaki srk-15j3
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Service Manual
Modular Crescent Cuber
Model
KMS-1402MLJ
Including
Condensing Unit Models
SRK-15J/3
hoshizakiamerica.com
Number: 73224
Issued: 5-16-2018

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Summary of Contents for Hoshizaki KMS-1402MLJ

  • Page 1 Service Manual Modular Crescent Cuber Model KMS-1402MLJ Including Condensing Unit Models SRK-15J/3 hoshizakiamerica.com Number: 73224 Issued: 5-16-2018...
  • Page 2 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 icemaker is serviced. Read the warnings and guidelines contained in this booklet carefully as they provide essential information for the continued safe use, service, and maintenance of the icemaker. Retain this booklet for any further reference that may be necessary. CONTENTS Important Safety Information ....................
  • Page 4 VI. Preparing the Appliance for Periods of Non-Use ............51 VII. Disposal ......................... 53 VIII. Technical Information ....................54 A. Specification and Performance Data Sheets ............... 54 1. KMS-1402MLJ with SRK-15J ................. 54 2. KMS-1402MLJ with SRK-15J3 ................55 3. SRK-15J ........................ 56 4. SRK-15J3 ......................57 B.

  • 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 Spray Tubes Wash Valve Hot Gas Valve Harvest Water Valve (WV2) Liquid Line Valve Liquid Line Shutoff Valve Evaporator Drier Suction Line Shutoff Valve Thermistor Control Board Control Box Fill/Refill Water Valve (WV1) Control Switch Service Switch Pump Motor...

  • Page 8: Condensing Unit

    2. Condensing Unit SRK-15J Control Box SRK-15J3 Control Box Fuse Fuse Condenser Headmaster (C.P.R.) Hot Gas Valves Liquid Line Valve Suction Line Shutoff Valve Liquid Line Shutoff Valve Check Valve Fan Motors and Fan Blades Liquid Line Shutoff Valve 2 Discharge Line Shutoff Valve Thermostat (Discharge Pipe) Crankcase Heater...

  • Page 9: Water Circuit/Refrigeration Circuit Diagram

    B. Water Circuit/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: Freeze-Time Correction Chart

    3. Freeze-Time Correction Chart...

  • Page 13: Service Diagnosis

    2) Check that the 115VAC 10A fuses in the KMS and SRK are good. Confirm that the location meets installation requirements: KMS-1402MLJ: • The appliance is not intended for outdoor use. Normal operating ambient temperature should be within 45°F to 100°F (7°C to 38°C).
  • Page 14 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 15 4) 1-Min. Fill Cycle – LED 4 is on. WV1 energizes. After 1 min., CB checks for a closed FS. If FS is closed, the harvest cycle begins. If harvest cycle begins (Comp, HGVs, and FMRs energized), continue to step 5a. If FS is open, WV1 remains energized until FS closes (low water safety protection during initial start up and at the end of each harvest).
  • Page 16 d) Relays: 1. X10 (WV1 and WV2): If WV1 continues and WV2 does not energize, check for 115VAC between X10 relay terminal #4 (GY) to neutral (W) and X10 relay terminal #2 (W/O) to neutral (W). If 115VAC is present at relay terminal #2 (W/O) and not at relay terminal #4 (GY), check for 115VAC at relay terminal #8 (P).
  • Page 17 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 WV2 de-energizes, LED 4 turns off, X12 relay de-energizes.
  • Page 18 Note: PM power supply switches from CB K1 #5 (DBU) in HPT to K1 #4 (R) in freeze. Refill – LEDs 1 and 4 are on. The KMS-1402MLJ uses a single F/S with a double F/S, UF/S refill initiation float switch setting (S5 dip switch 1) and is set for 1 refill (S5 dip switch 2 through 3).
  • Page 19 d) PM Diagnosis: Confirm water is flowing over evaporator from PM and not WV1 or WV2. If PM de-energizes once freeze begins (except for anti-slush), check for 115VAC at CB K1 #4 (R) to neutral (W). If 115VAC is not present, replace CB. If 115VAC is present and PM is de-energized, check for 115VAC at control switch #5 (W/R) to neutral (W).
  • Page 20 7) Pump-Out Cycle – LEDs 1, 3, and 2 are on (10/20 second pump-out). Timing of the first pump-out is determined by S4 dip switch 5. See the table below. Control Board Settings S4 Dip Switch Setting Pump-Out Frequency Control Board No.
  • Page 21 d) DV Diagnosis: X10 Relay: If 115VAC is present at CB K1 #1 (V) to neutral (W) and DV is de-energized, check for 115VAC at X10 relay #5 (V) and #3 (Y) to neutral (W). If 115VAC is present at #5 (V) and not at #3 (Y), confirm X10 relay is de-energized. If de-energized, replace X10 relay (sticking contacts).

  • Page 22: Freeze-Time Correction Cycle (90 Min.)

    C. Freeze-Time Correction Cycle (90 min.) Freeze-Time Correction function is enabled when S4 Dip Switch 7 is in the "ON" position and initiates when the minimum and maximum freeze times have exceeded differential parameters. Freeze-time correction timer and count starts at the beginning of the 2nd freeze cycle after startup from power off condition.
  • Page 23 2) Freeze-Time Correction Sequence: First occurrence within 36 hr., minimum and maximum freeze times have exceeded differential parameters. CB "POWER OK" LED starts blinking. Freeze-Time Correction Cycle starts. Second occurrence within 36 hr., minimum and maximum freeze times have exceeded differential parameters.

  • Page 24: Control Board Check

    D. 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 25 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) wire.

  • Page 26: Bin Control Check

    E. Bin Control Check 1. Bin Control Check This appliance uses a lever-actuated proximity switch to control the ice level in the storage bin. No adjustment is required. To check BC, follow the steps below. 1) Turn off the power supply. 2) Remove the front panel, then move the control switch to the "OFF"...
  • Page 27 5) Remove the actuator paddle from the switch mount. See Fig. 2. 6) Wipe down BC with a mixture of 1 part Hoshizaki "Scale Away" and 25 parts warm water. Rinse the parts thoroughly with clean water. 7) Reassemble BC and replace it in its correct position.

  • Page 28: Float Switch Check And Cleaning

    F. Float Switch Check and Cleaning F/S is used to determine that there is sufficient water in the water tank after the 1-minute fill cycle and after each harvest cycle. F/S is also used to determine that the appropriate volume of water has been converted into ice before switching out of the freeze cycle. No adjustment is required.
  • Page 29 9) Wipe down F/S 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. Rinse the parts thoroughly with clean water.

  • Page 30: Thermistor Check

    G. 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 top and right side panels, then remove the control box cover. 4) Remove the thermistor.

  • Page 31: Switches

    H. Switches Two control switches are used to control operation. These switches are referred to as the control switch" and the "service switch" and are located on the control box. 1. Control Switch The control switch has three positions: "OFF" for power off, "ICE" for icemaking, and "SERVICE"...

  • Page 32: Diagnostic Tables

    I. 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.D. Control Board Check." 1. No Ice Production No Ice Production - Possible Cause 1.
  • Page 33 No Ice Production - Possible Cause 14. Float Switch a) Float does not move freely. See "II.F. Float Switch Check and b) Defective. Cleaning" 15. Compressor a) Magnetic contactor contacts bad or coil winding open. b) Start capacitor or run capacitor defective (1 phase SRK). c) Start relay contacts bad or coil winding open (1 phase SRK).
  • Page 34 2. Freeze-Up Defrost and clean the icemaker prior to diagnosing freeze-up. Fill out a freeze-up checklist. See "II.J. Freeze Up Check List," the Hoshizaki America Technician's Pocket Guide, or contact your local distributor for a copy of the freeze-up checklist.

  • Page 35: Low Ice Production

    Freeze-Up - Possible Cause 8. Thermostatic Expansion Valve a) Bulb loose or defective. 9. Headmaster a) Defective. 10. Liquid Line Valves (KMS & SRK) a) Restricted. 3. Low Ice Production Low Ice Production - Possible Cause Long Harvest Cycle 1. Evaporator a) Scaled up.

  • Page 36: Freeze-Up Check List

    J. 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______________Fail Date___________ List model and manufacture of bin or dispenser__________________________. Date appliance was last cleaned:__________.

  • Page 37: Settings And Adjustments

    III. Settings and Adjustments • A Hoshizaki exclusive control board is employed in the Hoshizaki icemakers. • All models are pretested and factory adjusted. • For a control board check procedure, see "II.D. Control Board Check." NOTICE • Fragile, handle very carefully.

  • Page 38: 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 39: 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 40: 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 41: Harvest Time (S4 Dip Switch 1 & 2)

    2. Harvest Time (S4 dip switch 1 & 2) The harvest timer starts counting when the thermistor reaches 48°F (9°C) at the evaporator outlet and the control board reads 3.9 kΩ from the thermistor. The harvest timer is factory set, and generally no adjustment is required. However, a setting longer than the factory setting may be advised in cases where the drain provided at harvest needs to be prolonged for extra cleaning.

  • Page 42: 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 43: Harvest Pump Time (Harvest Assist)/Freeze-Time Correction (S4 Dip Switch 7)

    6. Harvest Pump Time (Harvest Assist)/Freeze-Time Correction (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) Depending on the harvest pump timer setting, the pump motor either stays off or is energized the last 50 seconds of harvest.

  • Page 44: Freeze Timer (S4 Dip Switch 9 & 10)

    In this case, see "II.I.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.

  • Page 45: 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. The refill counter determines the number of refills. The KMS-1122MLH does not refill during the freeze cycle.

  • Page 46: 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. • Move the control switch to the "OFF" position and turn off the power supply. Place the disconnect in the "OFF"...
  • Page 47 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 48 Remember to loosen the connection and purge the air from the hose. For the required refrigerant charge, see the rating label inside the icemaker. Hoshizaki recommends only virgin refrigerant or reclaimed refrigerant which meets ARI Standard 700 (latest edition) be used.

  • Page 49: 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 50: 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 51: 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 52 17) From the tee on the drain hose, blow out the drain valve using compressed air or carbon dioxide. 18) Move the service switch to the "CIRC." position and the control switch to the "OFF" position. 19) Turn off the power supply. 20) Reconnect the thermistor connector to the control board K3 (white) connector.

  • Page 53: Disposal

    VII. Disposal This 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 54: Technical Information

    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. 1. KMS-1402MLJ with SRK-15J Specification Sheet AC SUPPLY VOLTAGE 115VAC Supplied by SRK-15J via Factory Supplied Wire Harness ELECTRIC &...

  • Page 55: Kms-1402Mlj With Srk-15J3

    2. KMS-1402MLJ with SRK-15J3 Specification Sheet AC SUPPLY VOLTAGE 115VAC Supplied by SRK-15J3 via Factory Supplied Wire Harness ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F ELECTRIC W (kWH/100 lbs.) 2510 (4.55) 2340 (3.81) WATER gal./24HR (gal./100 lbs.) 292 (22.0) 725 (49.2) ICE PRODUCTION PER CYCLE 26.4 lbs.

  • Page 56: Srk-15J

    3. SRK-15J Specification Sheet AC SUPPLY VOLTAGE 208-230/60/1 ( 3 wire with neutral for 115V ) (115VAC Supplied to KMS via Factory Wire Harness) AMPERAGE 11.3 A ( 5 Min. Freeze AT 104°F / WT 80°F ) MINIMUM CIRCUIT AMPACITY 20 A MAXIMUM FUSE SIZE 20 A...

  • Page 57: Srk-15J3

    4. SRK-15J3 Specification Sheet AC SUPPLY VOLTAGE 208-230/60/3 (115VAC Supplied to KMS via Factory Wire Harness) AMPERAGE 9.2 A ( 5 Min. Freeze AT 104°F / WT 80°F ) MINIMUM CIRCUIT AMPACITY 20 A MAXIMUM FUSE SIZE 20 A EXTERIOR DIMENSIONS (WxDxH) 50-1/4"...

  • Page 58: Wiring Diagrams

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

  • Page 59: Kms-1402Mlj With Srk-15J

    2. KMS-1402MLJ with SRK-15J...

  • Page 60: Kms-1402Mlj With Srk-15J3

    3. KMS-1402MLJ with SRK-15J3...

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