Hoshizaki Serenity KMS-822MLH Service Manual
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Hoshizaki Serenity KMS-822MLH Service Manual

Hoshizaki Serenity KMS-822MLH Service Manual

Modular crescent cuber serenity series including condensing unit model srk-10h
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Hoshizaki
Hoshizaki America, Inc.
"A Superior Degree
of Reliability"
www.hoshizaki.com
Modular Crescent Cuber
Serenity Series
Model
KMS-822MLH
Including
Condensing Unit Model SRK-10H
SERVICE MANUAL
™
Number: 73182
Issued: 2-18-2011

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Summary of Contents for Hoshizaki Serenity KMS-822MLH

  • Page 1 Hoshizaki Hoshizaki America, Inc. Modular Crescent Cuber Serenity Series Model KMS-822MLH Including Condensing Unit Model SRK-10H SERVICE MANUAL “A Superior Degree of Reliability” www.hoshizaki.com ™ Number: 73182 Issued: 2-18-2011...
  • 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 ......................24 A. Diagnostic Procedure ....................24 B. Control Board Check ....................27 C. Bin Control Check and Cleaning ................. 28 1. Bin Control Check ....................28 2. Bin Control Cleaning ....................30 D. Float Switch Check and Cleaning ................31 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. CAUTION Indicates a situation which could result in damage to the unit.
  • 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-822MLH AC SUPPLY VOLTAGE 115VAC Supplied by SRK-10H via Factory Supplied Wire Harness APPROXIMATE ICE PRODUCTION Ambient WATER TEMP. (°F) PER 24 HR. Temp.(°F) lbs./day ( kg/day ) *839 (381) 820 (372) 769 (349) Reference without *marks...

  • Page 8: Condensing Unit

    B. Condensing Unit 1. SRK-10H AC SUPPLY VOLTAGE 208-230/60/1 (3 wire with neutral for 115VAC) (115VAC Supplied to KMS via Factory Wire Harness) AMPERAGE 11.5A (5 Min. Freeze AT 104°F / WT 80°F) MINIMUM CIRCUIT AMPACITY MAXIMUM FUSE SIZE EXTERIOR DIMENSIONS (W×D×H) 50"×17"×28"...

  • Page 9: General Information

    II. General Information A. Construction 1. Icemaker Spray Guide Water Supply Inlet Inlet Water Valve Spray Tube Hot Gas Valve (HGV) Expansion Valves (TXV) High-Side Service Valve Evaporator Drier Control Box Liquid Line Valve (LLV) Low-Side Service Valve Insulation Drain Valve Float Switch Pump Motor Cleaning Valve...

  • Page 10: Condensing Unit

    2. Condensing Unit Condenser Condenser Fan Motors (FMR) Hot Gas Valve (HGV) Headmaster (CPR) Liquid Line Valve (LLV) Control Box Low-Side Service Valve High-Side Service Valve Fuse (SRK) Receiver High-Pressure Switch Accumulator Compressor Discharge Thermostat...

  • Page 11: 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 green "BC CLOSED" LED come on. If 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 12: D) Pump-Out Cycle

    d) Pump-Out Cycle LEDs 1, 4, 3, and 2 are on. Comp and FMRs remain energized, HGVs and WV energize. LLVs de-energize. PM stops for 2 seconds, then DVR energizes, energizing PM and DV for 10 seconds. Water is removed from the bottom of the tank and sent down the drain.

  • Page 13: Sequence Flow Chart

    2. Sequence Flow Chart...

  • Page 14: 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. CAUTION 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 15: Control Board Layout

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

  • Page 16: 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 17: Controls And Adjustments

    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-hour production.

  • Page 18: C) Pump-Out Timer (S4 Dip Switch 3 & 4)

    c) Pump-Out Timer (S4 dip switch 3 & 4) CAUTION Factory set. Do not adjust. S4 dip switch 3 & 4 must remain in the factory default position of 3 off and 4 on. Otherwise, the drain valve will not energize during pump-out. At the end of a freeze cycle when a pump-out is called for, the pump motor stops for 2 seconds, then the drain valve relay energizes, energizing the pump motor and drain valve.

  • Page 19: 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 for recommendations. Time...

  • Page 20: H) Float Switch Control (S5 Dip Switch 1)

    CAUTION 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-822MLH uses a single float switch. S5 Dip Switch Setting Single or Double Float Switch Application No.

  • Page 21: Technical Information

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

  • Page 22: Wiring Diagram

    B. Wiring Diagram 1. KMS-822MLH with SRK-10H...

  • Page 23: Performance Data

    C. Performance Data 1. KMS-822MLH with SRK-10H 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 1710 1736 1749 CONSUMPTION 80/27 1730 1771 1770 1800...

  • Page 24: 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 25 180 seconds. WV is energized during harvest for a maximum of 6 minutes or the length of harvest minus 50 seconds, whichever is shorter. 50 seconds before the harvest timer terminates, LED 4 goes off WV de-energizes, LED 3 comes on and DVR energizes, energizing PM for the last 50 seconds of harvest.
  • Page 26 6) Pump-Out Cycle – (10 second pump-out) – LEDs 1, 4, 3, and 2 are on. LED 4 (WV circuit) is on when S4 dip switch 3 & 4 are set to factory default positions of 3 off and 4 on. With S4 dip switch 3 off & 4 on, CB energizes WV during pump-out. The WV circuit energizes DV through DVR during pump-out cycles.

  • Page 27: 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. Alarm Reset: If CB is in alarm (beeping), press the "ALARM RESET" button on CB while CB is beeping. WARNING! Risk of electric shock. Care should be taken not to touch live terminals.

  • Page 28: 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 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" LED on) and CB shuts down the unit according to the chart below.
  • Page 29 12) Allow the unit to cycle on. Press and hold the actuator paddle. The yellow "BC OPEN" LED should be on and the unit should shut down according to the chart above. If it does not, CB is bad and should be replaced. 13) Turn off the power supply. 14) If BC was removed, remove the control box and then replace BC and control box in their correct positions.

  • Page 30: Bin Control 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 Insulation 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 31: Float Switch Check And Cleaning

    D. Float Switch Check and Cleaning F/S is used to determine that there is sufficient water in the 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 32: Float Switch Cleaning

    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. Rinse the parts thoroughly with clean water.

  • Page 33: Thermistor Check

    E. 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 right side panel, then 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 minutes.

  • Page 34: 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 35: Freeze-Up

    24. Drain Valve a) Dirty, leaking by. b) Defective coil. 25. 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 Hoshizaki freeze up checklist. Freeze Up - Possible Cause Harvest Cycle 1. Evaporator a) Scaled up. b) Damaged. 2. Cube Guides a) Out of position.
  • Page 36 Freeze Up - Possible Cause 6. Float Switch a) Dirty, sticking. See "IV.D. 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 "II.C.2. Controls and b) Harvest pump timer (S4 dip switch 3 & 4) not in factory default Adjustments" and "IV.B. Control position.

  • Page 37: 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 38: 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 39: 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 40 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 41: 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 42: 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 43: Cleaning Procedure

    (allows solution flow to the inside of the evaporator) 1. Cleaning Procedure 1) Dilute 35 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.
  • Page 44 8) Pour the cleaning solution into the water tank. 9) Fully open the cleaning valve on the left side wall of the machine compartment. 10) Move the control switch to the "WASH" position. Replace the insulation panel and the front panel in their correct positions. 11) Turn on the power supply to start the washing process. 12) Turn off the power supply after 30 minutes.

  • Page 45: Sanitizing Procedure - Following Cleaning Procedure

    2. Sanitizing Procedure - Following Cleaning Procedure 1) Dilute a 5.25% sodium hypochlorite solution (chlorine bleach) with warm water (add 1.25 fl. oz. (37 ml) to 2.5 gal. (9.5 l) of water). 2) Remove the insulation panel. 3) Pour the sanitizing solution into the water tank. 4) Replace the insulation panel and the front panel in their correct positions.

  • Page 46: 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. Disconnect power before servicing. 1. Stainless Steel Exterior To prevent corrosion, wipe the exterior occasionally with a clean, soft cloth.
  • Page 47 2. Drain 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 cube guide B, then remove cube guide A. See Fig. 6. Remove the overflow cap, overflow pipe, and water shield. 4) Remove the drain plug. Allow the water tank to drain, then replace the drain plug in its correct position.

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