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Summary of Contents for Hoshizaki Serenity SRK-12J
- Page 1 Service Manual Modular Crescent Cuber Serenity Series Models KMS-1122MLJ with SRK-12J/3 Number: 73223 Issued: 3-21-2018 hoshizakiamerica.com Revised: 3-12-2019...
- 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;...
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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 IV. Refrigeration Circuit and Component Service Information..........44 A. Refrigeration Circuit Service Information ..............44 B. Component Service Information .................. 47 V. Maintenance ........................48 VI. Preparing the Appliance for Periods of Non-Use ............49 VII. Disposal ......................... 50 VIII. Technical Information ....................51 A.
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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.
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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 Cleaning Valve X12 Relay (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-12J... -
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: Freeze-Time Correction Flow Chart (Cb: 2A7664-02)
3. Freeze-Time Correction Flow Chart (CB: 2A7664-02) -
Page 13: 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 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 CB K4 red jumper.
- Page 15 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 FMRs 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 16 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 17 a) Freeze Cycle Diagnosis: Confirm Comp, FMRs, and PM continue. Confirm that LLVs energize. Next, confirm HGVs and X10 relay 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 18 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 19 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 20 2. Shutdown Diagnosis When the appliance is running, hold ice in contact with the thermostatic bulb. BC switch opens within 10 sec., shutting down the appliance. BC is factory set, and generally no adjustment is required. However, adjustment may be needed in some conditions, particularly at higher altitude locations.
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Page 21: Freeze-Time Correction Cycle (90 Min.) (Cb: 2A7664-02)
C. Freeze-Time Correction Cycle (90 min.) (CB: 2A7664-02) Freeze-Time Correction function is enabled when S4 Dip Switch 7 is in the "ON" position and initiates when the difference between the minimum and maximum recorded freeze times is equal to or greater than values shown in the table below. Freeze time is recorded and freeze cycles are counted starting at the 2nd freeze cycle after startup from a power off condition. - Page 22 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.
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Page 23: 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 24 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.
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Page 25: Bin Control Check
E. 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 26: Float Switch Check And Cleaning
F. Float Switch Check and Cleaning FS is used to confirm sufficient water in the water tank after the 1-min. fill cycle and after each harvest cycle. FS is also used to terminate the freeze cycle. No adjustment is required. 1. Float Switch Check To check FS, follow the steps below. - Page 27 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.
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Page 28: 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 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 29: 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 30: 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 31 No Ice Production - Possible Cause 13. Inlet Water Valve a) Screen or orifice clogged. b) Coil winding open. c) Water valve open in freeze cycle. 14. Float Switch a) Float does not move freely. See "II.F. Float Switch Check and b) Defective.
- Page 32 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 33 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.
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Page 34: 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 35: Controls And Adjustments
III. Controls and Adjustments • A Hoshizaki exclusive control board is employed in the KMS-1122MLJ series. • 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 36: 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 37: Led Lights And Audible Alarm Safeties
B. LED Lights and Audible Alarm Safeties Beep occurs and red "POWER OK" LED turns on when control switch is moved to "ICE" position. Sequence Green LEDs 1 through 4 turn on and sequence from initial startup as listed in the table below. -
Page 38: 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 39: 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 40: 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 41: 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) 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 42: 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 43: Refill Counter (S5 Dip Switch 2 And 3)
10. Refill Counter (S5 dip switch 2 and 3) The refill counter determines the number of refills. The KMS-1122MLJ does not refill during the freeze cycle. NOTICE Do not adjust. These must be left in the factory default position or the icemaker will not operate correctly. -
Page 44: 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 45 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 46 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.
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Page 47: 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 48: 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 49: 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 50: 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 51: 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 boldshould be used for reference only. 1. -
Page 52: Kms-1122Mlj With Srk-12J3
2. KMS-1122MLJ with SRK-12J3 Specification Sheet AC SUPPLY VOLTAGE 115VAC Supplied by SRK-12J3 via Factory Supplied Wire Harness ELECTRIC & WATER CONSUM 90/70°F 70/50°F ELECTRIC W (kWH/100 lb 1850 (4.05) 1730 (3.60) WATER gal./24HR (gal./100 176 (16.0) 338 (29.3) ICE PRODUCTION PER CYCL 18.6 lbs. (8.4 kg) 880pcs. BIN CONTROL SYSTEM Thermostatic REFRIGERANT CHARGE... -
Page 53: Srk-12J
3. SRK-12J Specification Sheet AC SUPPLY VOLTAGE 208-230/60/1 ( 3 wire with neutral for 115V ) (115VAC Supplied to KMS via Factory Wire Harness) AMPERAGE 11.6 A ( 5 Min. Freeze AT 104°F / WT 80°F ) MINIMUM CIRCUIT AMPACITY 20 A MAXIMUM FUSE SIZE 20 A... -
Page 54: Srk-12J3
4. SRK-12J3 Specifications Sheet 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) 50-1/4"... -
Page 55: Wiring Diagrams
B. Wiring Diagrams 1. Wire Harness Connections... -
Page 56: Kms-1122Mlj With Srk-12J
2. KMS-1122MLJ with SRK-12J... -
Page 57: Kms-1122Mlj With Srk-12J3
3. KMS-1122MLJ with SRK-12J3...
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