Hoshizaki Serenity Series KMS-830MLH Service Manual
  1. Manuals
  2. Brands
  3. Hoshizaki Manuals
  4. Ice Maker
  5. Serenity Series KMS-830MLH
  6. Service manual
Hoshizaki Serenity Series KMS-830MLH Service Manual

Hoshizaki Serenity Series KMS-830MLH Service Manual

Modular crescent cuber including condensing unit models srk-8h/3
Hide thumbs Also See for Serenity Series KMS-830MLH:
Table of Contents

Advertisement

Quick Links

Download this manual See also: Instruction Manual
Hoshizaki
Hoshizaki America, Inc.
"A Superior Degree
of Reliability"
www.hoshizaki.com
Modular Crescent Cuber
Serenity Series
Model
KMS-830MLH
Including
Condensing Unit Models
SRK-8H/3
SERVICE MANUAL
™
Number: 73185
Issued: 7-27-2011

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the Serenity Series KMS-830MLH and is the answer not in the manual?

Questions and answers

Subscribe to Our Youtube Channel

Related Manuals for Hoshizaki Serenity Series KMS-830MLH

Summary of Contents for Hoshizaki Serenity Series KMS-830MLH

  • Page 1 Hoshizaki Hoshizaki America, Inc. Modular Crescent Cuber Serenity Series Model KMS-830MLH Including Condensing Unit Models SRK-8H/3 SERVICE MANUAL “A Superior Degree of Reliability” www.hoshizaki.com ™ Number: 73185 Issued: 7-27-2011...
  • Page 2 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, write, or send an e-mail message to the Hoshizaki Technical Support Department for assistance. HOSHIZAKI AMERICA, INC.

  • Page 3: Table Of Contents

    IMPORTANT This manual should be read carefully before the icemaker is serviced or maintenance operations are performed. Only qualified service technicians should install, service, and maintain the icemaker. Read the warnings contained in this booklet carefully as they give important information regarding safety. Please retain this booklet for any further reference that may be necessary.
  • Page 4 IV. Service Diagnosis ......................28 A. Diagnostic Procedure ....................28 B. Control Board Check ....................32 C. Bin Control Check and Cleaning ................. 33 1. Bin Control Check ....................33 2. Bin Control Cleaning ....................35 D. Float Switch Check and Cleaning ................36 1.

  • 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, or damage to the unit. WARNING Indicates a hazardous situation which could result in death or serious injury. NOTICE Indicates a situation which could result in damage to the unit or property.
  • Page 6 For SRK • Electrical connection must be hard-wired and must meet national, state, and local electrical code requirements. Failure to meet these code requirements could result in death, electric shock, serious injury, fire, or severe damage to equipment. • The remote condensing unit requires an independent power supply of proper capacity. See the nameplate for electrical specifications. Failure to use a properly sized breaker or fuse can result in a tripped breaker, blown fuses, or damage to existing wiring.

  • Page 7: Specifications

    I. Specifications A. Icemaker 1. KMS-830MLH with SRK-8H AC SUPPLY VOLTAGE 115VAC Supplied by SRK-8H via Factory Supplied Wire Harness APPROXIMATE ICE PRODUCTION Ambient WATER TEMP. (°F) PER 24 HR. Temp.(°F) lb./day ( kg/day ) *820 (372) 785 (356) 737 (334) Reference without *marks 793 (360) 739 (335)
  • Page 8 2. KMS-830MLH with SRK-8H3 AC SUPPLY VOLTAGE 115VAC Supplied by SRK-8H3 via Factory Supplied Wire Harness APPROXIMATE ICE PRODUCTION Ambient WATER TEMP. (°F) PER 24 HR. Temp.(°F) lb./day ( kg/day ) *791 (359) 761 (345) 711 (322) Reference without *marks 768 (349) 722 (328) 667 (302)

  • Page 9: Condensing Unit

    B. Condensing Unit 1. SRK-8H AC SUPPLY VOLTAGE 208-230/60/1 (3 wire with neutral for 115VAC) (115VAC Supplied to KMS via Factory Wire Harness) AMPERAGE 9.1 A ( 5 Min. Freeze AT 104°F / WT 80°F ) MINIMUM CIRCUIT AMPACITY 20 A MAXIMUM FUSE SIZE 20 A EXTERIOR DIMENSIONS (WxDxH)
  • Page 10 2. SRK-8H3 AC SUPPLY VOLTAGE 208-230/60/3 (115VAC Supplied to KMS via Factory Wire Harness) AMPERAGE 7.5 A ( 5 Min. Freeze AT 104°F / WT 80°F ) MINIMUM CIRCUIT AMPACITY 20 A MAXIMUM FUSE SIZE 20 A EXTERIOR DIMENSIONS (WxDxH) 33.6"x23"x22.1"...

  • Page 11: General Information

    II. General Information A. Construction 1. Icemaker Insulation Inlet Water Valve Spray Guide Spray Tube Thermostatic Expansion Valve Evaporator Control Box Insulation Control Switch Fuse (KMS) Strainer Liquid Line Valve Hot Gas Float Switch Valve Drier Pump Motor Cleaning Valve Left Side Panel Bin Control Insulation...

  • Page 12: Condensing Unit

    2. Condensing Unit Top Panel Right Side Panel Hot Gas Valve Liquid Line Valve Compressor) Condenser Fan Motor Condenser Headmaster (C.P.R.) High-Pressure Switch Discharge Line Thermostat Receiver Fuse (SRK) Control Box Accumulator Low-Side Service Valve High-Side Service Valve Control Box Cover Louver Panel Left Side Panel...

  • Page 13: Sequence Of Operation

    B. Sequence of Operation 1. Sequence Cycles and Shutdown The steps in the sequence are as outlined below. When power is supplied, CB red "POWER OK" LED and CB green "BC CLOSED" LED turns on. If CB yellow "BC OPEN" LED is on, the unit will not start. In this case, clear ice away from the BC actuator paddle in the dispenser unit/storage bin area.

  • Page 14: D) Pump-Out Cycle

    d) Pump-Out Cycle LEDs 1, 3, and 2 are on. LED 4 is on when S4 dip switch 3 & 4 are set to 3 off and 4 on. For details, see "II.C.3.c) Pump-Out Timer (S4 dip switch 3 & 4)." NOTICE! Do not adjust S4 dip switch 3 & 4 to 3 off and 4 on. Adjustment to this position on this model prevents the pump motor from rotating in the pump-out (reverse) direction.

  • Page 15: Sequence Flow Chart

    2. Sequence Flow Chart...

  • Page 16: Control Board

    C. Control Board • A Hoshizaki exclusive solid-state control board is employed in Hoshizaki Crescent Cubers. • All models are pretested and factory set. • For a control board check procedure, see "IV.B. Control Board Check." NOTICE 1. The control board is fragile; handle very carefully. 2. The control board contains integrated circuits, which are susceptible to failure due to static discharge.

  • Page 17: Control Board Layout

    1. Control Board Layout "G" Control Board • "OUTPUT TEST" Button • S4 Dip Switch • "ALARM RESET" Button (used to test relays on control board) • Bin Control Switch • K3 Connector (white) Closed LED (green) Harvest Control (thermistor) •...

  • Page 18: Led Lights And Audible Alarm Safeties

    2. LED Lights and Audible Alarm Safeties At startup, a 5-second delay occurs while the control board conducts an internal timer check. A beep occurs when the control switch is moved to the "ICE" position. The red LED indicates proper control voltage and remains on unless a control voltage problem occurs. The green LEDs 1 through 4 energize and sequence from initial startup as listed in the table below.

  • Page 19: Controls And Adjustments

    However, a setting longer than the factory setting may be advised in cases where harvest needs to be prolonged for extra cleaning. Before changing this setting, contact your local Hoshizaki distributor or 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 20: C) Pump-Out Timer (S4 Dip Switch 3 & 4)

    c) Pump-Out Timer (S4 dip switch 3 & 4) NOTICE Do not adjust S4 dip switch 3 & 4 to 3 off and 4 on. Otherwise, pump motor does not rotate in the pump-out direction. When a pump-out is called for, the pump motor de-energizes for 2 seconds, then energizes for 10/20 seconds in reverse direction.

  • Page 21: E) Harvest Pump Timer (S4 Dip Switch 7)

    After 2 consecutive freeze timer terminations, the control board shuts down the icemaker. In this case, see "IV.F.3. Low Ice Production" for possible solutions. The freeze timer is factory set, and generally no adjustment is required. Before changing this setting, contact your local Hoshizaki distributor or Hoshizaki Technical Support at 1-800-233-1940 for recommendations. Time...

  • Page 22: H) Float Switch Control (S5 Dip Switch 1)

    h) Float Switch Control (S5 dip switch 1) NOTICE Factory set. Do not adjust. Otherwise, the unit will not operate correctly. S5 dip switch 1 allows for single or double float switch applications. The KMS-830MLH uses a single float switch. S5 Dip Switch Setting Single or Double Float Switch Application No.

  • Page 23: Technical Information

    III. Technical Information A. Water Circuit and Refrigeration Circuit...

  • Page 24: Wiring Diagram

    B. Wiring Diagram 1. KMS-830MLH with SRK-8H...
  • Page 25 2. KMS-830MLH with SRK-8H3...

  • Page 26: Performance Data

    C. Performance Data 1. KMS-830MLH with SRK-8H APPROXIMATE ICE WATER TEMP. (ºF/ºC) AMBIENT TEMP. PRODUCTION PER 24 HR. (ºF/ºC) 50/10 70/21 90/32 70/21 80/27 90/32 lbs./day kg./day 100/38 APPROXIMATE ELECTRIC 70/21 1560 1572 1599 CONSUMPTION 80/27 1569 1587 1620 90/32 1572 1600 1631...
  • Page 27 2. KMS-830MLH with SRK-8H3 APPROXIMATE ICE WATER TEMP. (ºF/ºC) AMBIENT TEMP. PRODUCTION PER 24 HR. (ºF/ºC) 50/10 70/21 90/32 70/21 80/27 90/32 lbs./day kg./day 100/38 APPROXIMATE ELECTRIC 70/21 1470 1493 1521 CONSUMPTION 80/27 1488 1524 1549 1550 90/32 1493 1576 watts 100/38 1497...

  • Page 28: Service Diagnosis

    IV. Service Diagnosis WARNING 1. This unit should be diagnosed and repaired only by qualified service personnel to reduce the risk of death, electric shock, serious injury, or fire. 2. Risk of electric shock. Use extreme caution and exercise safe electrical practices.
  • Page 29 4) Initial Harvest Cycle – LEDs 1, 4, and 2 are on. WV and X11 relay remain energized, Comp, FMR, 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 a 3.9 kΩ...
  • Page 30 5) Freeze Cycle – LED 1 is on. Comp, FMR, and PM remain energized (PM power supply switches from CB K1 connector pin #5 (DBU wire) to CB K1 connector pin #4 (R wire). LLVs energize. HGVs and X10 relay de-energize. CB 5-minute short cycle protection timer prevents CB from monitoring F/S for the first 5 minutes of freeze.
  • Page 31 During the pump-out cycle, PM is energized from CB K1 connector pin #5 (DBU wire) through X10 relay terminal #6 and terminal #2. This allows for PM reverse rotation and water flow to pump-out check valve. Diagnosis: Check that PM stops for 2 seconds, then restarts.

  • Page 32: Control Board Check

    B. 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. Always choose a neutral (W wire) to establish a good neutral connection when checking voltages.

  • Page 33: Bin Control Check And Cleaning

    C. 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 K4 (red) connector. When calling for ice, BC proximity switch is closed (green "BC CLOSED" LED on). When BC actuator paddle is engaged, BC proximity switch is open (yellow "BC OPEN" LED on) and CB shuts down the unit according to the chart below.
  • Page 34 13) If BC assembly was removed, replace BC assembly in its correct position. 14) Replace the control box cover in its correct position. 15) Replace the panels in their correct positions. 16) Turn on the power supply to start the automatic icemaking process. Legend: BC–bin control;...

  • Page 35: Bin Control Cleaning

    5) Remove BC insulation. Remove BC cover thumbscrews, then lift BC assembly out of the icemaker. See Fig. 3. 6) Remove BC from the extension bracket. 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. 8) Reassemble BC assembly and replace it in its correct position.

  • Page 36: Float Switch Check And Cleaning

    D. 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 37: Float Switch Cleaning

    Flush 10) Wipe down F/S assembly's housing, shaft, float, and retainer rod with a mixture of 1 Shaft part Hoshizaki "Scale Away" and 25 parts warm water. Clean the inside of the rubber Float Switch boot and hose with cleaning solution. Rinse Housing the parts thoroughly with clean water.

  • Page 38: Thermistor Check

    13) Replace the insulation panel, then replace the left side, top, and front panels in their correct positions. 14) Turn on the power supply to start the automatic icemaking process. Legend: CB–control board; F/S–float switch E. Thermistor Check To check thermistor resistance, follow the steps below. 1) Turn off the power supply.

  • Page 39: Diagnostic Charts

    F. Diagnostic Charts Before consulting the diagnostic charts, check for correct installation, proper voltage per unit nameplate, and adequate water supply. Check CB using the steps in "IV.B. Control Board Check." Check the dip switch settings to assure that S4 dip switch 3, 4, 7, 8, 9, 10, and S5 dip switch 1 through 5 are in the factory default position. S4 dip switch 1, 2, 5, 6 are cleaning adjustments and the settings are flexible. For factory default settings, see "II.C.3.a) Default Dip Switch Settings." 1.

  • Page 40: Freeze-Up

    26. Water System a) Water leaks causing short freeze time. 2. Freeze-Up Defrost and clean the unit prior to diagnosing freeze-up. See "VI.A. Cleaning and Sanitizing Instructions." 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. Freeze-Up - Possible Cause Harvest Cycle 1. Evaporator a) Scaled up.
  • Page 41 Freeze-Up - Possible Cause 3. Spray Tubes and/or Spray a) Dirty. Guides b) Out of position. 4. Water Supply a) Low water pressure. b) External water filters clogged. c) Insufficient water line size. Minimum 1/4" nominal ID copper water tubing or equivalent. 5. Inlet Water Valve a) Screen or orifice clogged. b) Defective.

  • Page 42: 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 43: Replacement Of Components

    V. Replacement of Components WARNING 1. This unit should be diagnosed and repaired only by qualified service personnel to reduce the risk of death, electric shock, serious injury, or fire. 2. Move the control switch to the "OFF" position and turn off the power supply before servicing. Lockout/Tagout to prevent the power from being turned back on inadvertently.

  • Page 44: Brazing

    2. Brazing WARNING 1. R-404A itself is not flammable at atmospheric pressure and temperatures up to 176°F (80°C). 2. 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 45 5) Disconnect the gauge manifold hose from the vacuum pump and attach it to a refrigerant service cylinder. Remember to loosen the connection and purge the air from the hose. See the nameplate on the SRK for the required refrigerant charge. Hoshizaki recommends only virgin refrigerant or reclaimed refrigerant which meets ARI Standard 700 (latest edition) be used.

  • Page 46: Important Notes For Component Replacement

    Install a new capacitor. Thermistor • Attach the new thermistor to the suction line in the same location as the previous thermistor. • 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. • Secure the thermistor with the holder, then insulate it. • Be very careful to prevent damage to the leads. Thermistor Holder Thermistor Lead...

  • Page 47: Cleaning And Maintenance

    3. The dispenser unit/storage bin is for ice use only. Do not store anything else in the dispenser unit/storage bin. A. Cleaning and Sanitizing Instructions Hoshizaki recommends cleaning and sanitizing this unit at least once a year. More frequent cleaning and sanitizing, however, may be required in some existing water conditions.

  • Page 48: Cleaning Procedure

    1. Cleaning Procedure 1) Dilute 13.5 fl. oz. (400 ml) of Hoshizaki "Scale Away" with 2.5 gal. (9.5 l) of warm water. 2) Remove all ice from the evaporator and the dispenser unit/storage bin. Note: To remove cubes on the evaporator, turn off the power supply and turn it back on after 3 minutes. The harvest cycle starts and the cubes will be removed from the evaporator.
  • Page 49 9) In bad or severe water conditions, clean the float switch as described below. Otherwise, continue to step 10. a. Disconnect the vent tube and the flush tube from the top of the float switch housing, then remove the float switch assembly. Remove the rubber boot from the bottom of the assembly.

  • Page 50: Sanitizing Procedure - Following Cleaning Procedure

    30) Disconnect the distributor from the distribution hose. Remove the thumbscrew securing cube guide B. Remove cube guide B, then remove cube guide A. Remove the overflow cap and overflow pipe. 31) Remove the drain plug. Allow the water tank to drain, then replace the drain plug in its correct position.

  • Page 51: Maintenance

    B. Maintenance This icemaker must be maintained individually, referring to the instruction manual and labels provided with the icemaker. WARNING 1. Only qualified service technicians should attempt to service this icemaker. 2. Move the control switch to the "OFF" position and turn off the power supply to the SRK condensing unit before servicing the KMS or SRK. Place the KMS disconnect (if applicable) in the off position.
  • Page 52 5) Make sure at least 3 minutes have elapsed since you turned off the power supply. Make sure the control switch is in the "ICE" position. Replace the front panel in its correct position and turn on the power supply. 6) Blow the icemaker water supply line out using the compressed air or carbon dioxide supply.

This manual is also suitable for:

Serenity seriesKms-830mlhSrk-8hSrk-8h3

Table of Contents