Hoshizaki Serenity Series Service Manual
Including condensing unit models
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Summary of Contents for Hoshizaki Serenity Series
- Page 1 Service Manual Modular Crescent Cuber Serenity Series Model KMS-2000MLJ Including Condensing Unit Models SRK-20J/3 Number: 73225 hoshizakiamerica.com Issued: 6-15-2018 Revised: 7-24-2019...
- 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;...
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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 ......................... 51 VIII. Technical Information ....................52 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 Diagram
I. Construction and Water/Refrigeration Circuit Diagram A. Construction 1. Icemaker Top Panel Top Insulation Inlet Water Valve Spray Guides Wash Valve Hot Gas Valve Spray Tubes Strainer Insulation Panel Suction Line Evaporator Shutoff Valve Thermostatic Expansion Valves Liquid Line Shutoff Valve Thermistor Control Box Drier... -
Page 8: Condensing Unit
2. Condensing Unit Top Panel Main Transformer (Three Phase Only) Condenser Right Side Panel Control Box Fan Motors Liquid Line Shutoff Valve 2 High-Pressure Switch Suction Line Compressor Shutoff Valve Crankcase Heater Liquid Line Louver Panel Junction Box Shutoff Valve Front Panel Discharge Line Thermostat Liquid Line Valve... -
Page 9: Water Circuit And Refrigeration Circuit
B. Water Circuit and Refrigeration Circuit... -
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
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. Control switch in "OFF" position does not de-energize all loads. - 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 5a) Initial Harvest Cycle – LEDs 1, 4, and 2 are on. WV and X11 relay continue. Comp, FMRs, 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 3.9 kΩ...
- Page 16 5c) Initial Harvest Cycle Termination Diagnosis: 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). Check discharge line temperature.
- Page 17 c) WV and HGVs Diagnosis: If WV is energized, check for 115VAC at CB K1 #6 (O) to neutral (W). If 115VAC is present after PM energizes in harvest cycle, replace CB. If 115VAC is not present, replace WV (bypassing). If HGVs (KMS and SRK) did not de-energize at the end of harvest, check for 115VAC at CB K1 #2 (P) to neutral (W).
- Page 18 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 19 d) PM Diagnosis: Check for 115VAC at X12 relay #6 (DBU) to neutral (W). If 115VAC is not present, see "b) CB Diagnosis" above. Next, check for 115VAC at X12 relay #4 (W/R) to neutral (W). If 115VAC is not present, confirm X12 relay is energized. If X12 relay is de-energized, see "c) X12 Relay Diagnosis:"...
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Page 20: 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 21 Third occurrence within 36 hr. minimum and maximum freeze times have exceeded differential parameters. CB yellow "EXT HARVEST" LED starts blinking. Also, If not reset, CB "POWER OK" LED continues blinking. If reset, CB "POWER OK" LED starts blinking. Freeze-Time Correction Cycle starts. Total freeze-time correction cycle last for 90 min.
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Page 22: 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 23 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 24: 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 25 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.
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Page 26: 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 27 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.
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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 top and right side panels, then remove the control box cover. 4) Remove the thermistor. -
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 - continued 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 32 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 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-2000MLJ 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 Control Board • Bin Control Switch Closed LED (green) • "OUTPUT TEST" Button • S4 Dip Switch • "ALARM RESET" Button (used to test relays on control board) • K3 (white) Connector • Bin Control Switch Open LED (yellow) Thermistor (harvest control and... -
Page 37: 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, appliance 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 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: Factory Use (S4 Dip Switch 8)
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) 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 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
B. Component Service Information NOTICE When replacing a component listed below, see the notes to help ensure proper operation. Component Notes Compressor 1 Phase SRK: Install a new start capacitor, run capacitor, and start relay. 3 Phase SRK: Install a new magnetic contactor. Thermostatic •... -
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 2. Remove the water from the water tank: 17) Remove the insulation panel and front frame. 18) Disconnect the hoses connected to the water tank. Allow the tank and hoses to drain completely. See Fig. 6. 19) Remove all ice from the dispenser unit/storage bin and clean the dispenser unit/storage bin liner using a neutral cleaner.
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Page 51: 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 52: 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 53: Kms-2000Mlj With Srk-20J3
2. KMS-2000MLJ with SRK-20J3 Specification Sheet AC SUPPLY VOLTAGE 208-230/60/3 AMPERAGE 13 A ( 5 Min. Freeze AT 104°F / WT 80°F) MINIMUM CIRCUIT AMPACITY 30 A MAXIMUM FUSE SIZE 30 A ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F ELECTRIC W (kWH/100 lbs.) 3400 (4.30) 3170 (3.93) WATER gal./24HR (gal./100 lbs.) -
Page 54: Srk-20J
3. SRK-20J Specification Sheet AC SUPPLY VOLTAGE 208-230/60/1 ( 3 wire with neutral for 115V ) (115VAC Supplied to KMS via Factory Wire Harness) AMPERAGE 23.3 A ( 5 Min. Freeze AT 104°F / WT 80°F ) MINIMUM CIRCUIT AMPACITY 30 A MAXIMUM FUSE SIZE 30 A... -
Page 55: Srk-20J3
4. SRK-20J3 Specification Sheet AC SUPPLY VOLTAGE 208-230/60/3 (115VAC Supplied to KMS via Factory Wire Harness) AMPERAGE 13.0 A ( 5 Min. Freeze AT 104°F / WT 80°F ) MINIMUM CIRCUIT AMPACITY 20 A MAXIMUM FUSE SIZE 20 A EXTERIOR DIMENSIONS (WxDxH) 59-3/4"... -
Page 56: Wiring Diagrams
B. Wiring Diagrams 1. Wire Harness Connections... -
Page 57: Kms-2000Mlj With Srk-20J
2. KMS-2000MLJ with SRK-20J... -
Page 58: Kms-2000Mlj With Srk-20J3
3. KMS-2000MLJ with SRK-20J3...
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