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Summary of Contents for Hoshizaki Serenity KMS-2000MLH
- Page 1 Hoshizaki Hoshizaki America, Inc. Modular Crescent Cuber Serenity Series Model KMS-2000MLH Including Condensing Unit Models SRK-20H/3 SERVICE MANUAL “A Superior Degree of Reliability” www.hoshizaki.com ™ Number: 73188 Issued: 8-30-2011...
- 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
CONTENTS Important Safety Information ....................5 I. Specifications ........................7 A. Icemaker ........................7 1. KMS-2000MLH with SRK-20H ................. 7 2. KMS-2000MLH with SRK-20H3 ................8 B. Condensing Unit ......................9 1. SRK-20H ........................9 2. SRK-20H3 ......................10 II. - Page 4 III. Technical Information ...................... 26 A. Water Circuit and Refrigeration Circuit ................ 26 B. Wiring Diagrams ......................27 1. KMS-2000MLH with SRK-20H ................27 2. KMS-2000MLH with SRK-20H3 ................28 3. Wire Harness Connections ..................29 C. Performance Data ....................... 30 1.
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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 unit, or damage to property. WARNING Indicates a hazardous situation which could result in death or serious injury. - 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 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.
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Page 7: Specifications
I. Specifications A. Icemaker 1. KMS-2000MLH with SRK-20H AC SUPPLY VOLTAGE 115VAC Supplied by SRK-20H via Factory Supplied Wire Harness AMPERAGE 21.3 A (5 Min. Freeze AT 104°F/WT 80°F) MINIMUM CIRCUIT AMPACITY 30 A MAXIMUM FUSE SIZE 30 A APPROXIMATE ICE PRODUCTION Ambient WATER TEMP. -
Page 8: Kms-2000Mlh With Srk-20H3
2. KMS-2000MLH with SRK-20H3 AC SUPPLY VOLTAGE 115VAC Supplied by SRK-20H3 via Factory Supplied Wire Harness AMPERAGE 11.0 A (5 Min. Freeze AT 104°F/WT 80°F) MINIMUM CIRCUIT AMPACITY 20 A MAXIMUM FUSE SIZE 20 A APPROXIMATE ICE PRODUCTION Ambient WATER TEMP. (°F) PER 24 HR. -
Page 9: Condensing Unit
B. Condensing Unit 1. SRK-20H AC SUPPLY VOLTAGE 208-230/60/1 (3 wire with neutral for 115VAC) (115VAC Supplied to KMS via Factory Wire Harness) AMPERAGE 21.3 A (5 Min. Freeze AT 104°F/WT 80°F) MINIMUM CIRCUIT AMPACITY 30 A MAXIMUM FUSE SIZE 30 A EXTERIOR DIMENSIONS (WxDxH) 59.7"x17"x30"... -
Page 10: Srk-20H3
2. SRK-20H3 AC SUPPLY VOLTAGE 208-230/60/3 (115VAC Supplied to KMS via Factory Wire Harness) AMPERAGE 11.0 A (5 Min. Freeze AT 104°F/WT 80°F) MINIMUM CIRCUIT AMPACITY 20 A MAXIMUM FUSE SIZE 20 A EXTERIOR DIMENSIONS (WxDxH) 59.7"x17"x30" (1517x431x762 mm) DIMENSIONS INCLUDING LEGS (WxDxH) 62"x21"x45"... -
Page 11: General Information
II. General Information A. Construction 1. Icemaker Top Panel Top Insulation Inlet Water Valve Spray Guides Wash Valve Hot Gas Valve Spray Tubes Strainer Insulation Panel Low Side Evaporator Service Valve Thermostatic Expansion Valves High Side Service Valve Thermistor Control Box Drier Liquid Line Valve Pump Motor... -
Page 12: Condensing Unit
2. Condensing Unit Condenser Main Transformer Top Panel (Three Phase Only) Control Box Right Side Panel Fan Motors Compressor Junction Box Low Side Service Valve High Side Louver Panel Service Valve Front Panel Discharge Line Thermostat Liquid Line Valve Left Side/Upper Panel Right (L3) Strainers High-Pressure Switch Hot Gas Valves... -
Page 13: Sequence Of Operation
CB 1-minute default refill timer starts (LED 9 is on during CB 1-minute default refill). The KMS-2000MLH is not wired for the 1-minute default refill. When CB 1-minute default refill timer terminates, CB turns freeze termination over to F/S. -
Page 14: D) Pump-Out Cycle
Anti-Slush Control: LED 5 is on. Comp, FMRs, and LLVs remain energized. PM de-energizes for 10 seconds. CB monitors the cooling of the evaporator via the thermistor located on the suction line. When the temperature drops to 34°F (1°C), CB reads 5.8 kΩ... -
Page 15: F) Shutdown
f) Shutdown LEDs 4 and 7 are on: When BC is activated (BC open), CB red "POWER OK" LED flashes. There is a delay before the shutdown sequence begins. The delay varies depending on the cycle the icemaker is in at the time of activation. For details, see the table below. Cycle at Bin Control Activation Delay Before Shutdown Sequence Begins Fill Cycle 15 seconds Harvest Cycle 15 seconds after the next freeze cycle starts... -
Page 16: Sequence Flow Chart
2. Sequence Flow Chart... -
Page 17: Control Board
C. Control Board • A Hoshizaki exclusive control board is employed in Hoshizaki Crescent Cubers. • All models are pretested and factory-adjusted. • 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 18: Control Board Layout
1. Control Board Layout "H" Control Board • "POWER OK" LED (red) (Lights when 10.5VAC is supplied to K7 connector. • Label Flashes when bin control • K7 Connector (Control board part number and is activated (bin full)) Control Transformer (10.5VAC) program version indicated on label.) •... -
Page 19: Led Lights And Audible Alarm Safeties
2. LED Lights and Audible Alarm Safeties At startup, a 5-second delay occurs. The red "POWER OK" LED indicates proper control voltage and remains on unless a control voltage problem occurs. The red "POWER OK" LED flashes continuously when the bin is full. LEDs 4 through 9 energize and sequence from initial startup as listed in the table below. Note that the order of the LEDs from the outer edge of the control board is 5, 6, 8, 9, 4, 7. For details, see "II.B. Sequence of Operation." Time LEDs are On Energized Sequence Step Components Min. Max. Avg. 1-Minute Fill Cycle 1 minute Harvest Cycle... -
Page 20: 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 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 21: C) Pump-Out Timer (S1 Dip Switch 3 & 4)
c) Pump-Out Timer (S1 dip switch 3 & 4) When a pump-out is called for, the pump motor de-energizes for 2 seconds, then the pump motor and drain valve energize for 10/20 seconds. Water is removed from the bottom of the water tank and pumped down the drain through the drain valve. At the same time, water flows through the small float switch tube to power flush the float switch. -
Page 22: E) Harvest Pump Timer (S1 Dip Switch 7 & 8)
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. Dip Switch Setting... -
Page 23: G) Pump-Out/Drain Selector (S2 Dip Switch 1)
(upper or lower) the control board monitors for refill initiation during the freeze cycle, and the refill counter (S2 dip switch 3 & 4) determines the number of refills. The KMS-2000MLH uses a single float switch with a double float switch/upper float switch refill setting. The KMS-2000MLH does not refill. When the 5-minute short cycle protection timer terminates, the control board checks the upper float switch. If an upper float switch exists, refill is initiated by an open upper float switch and is terminated by a closed upper float switch. In a single float switch application with a double float switch/upper float... -
Page 24: J) Anti-Slush Program Selector (S2 Dip Switch 5)
j) Anti-Slush Program Selector (S2 dip switch 5) The anti-slush program selector determines which anti-slush program is used during the freeze cycle when the anti-slush control (S2 dip switch 6) is activated. The anti-slush control helps prevent slushing in the water tank during the freeze cycle. S2 Dip Switch Settings Pump Motor # of Times Pump... -
Page 25: Control And Service Switches
D. Control and Service Switches The control switch and service switch are used to control the operation of this unit. They are located on the control box. 1. Control Switch The control switch has three positions: "OFF" for power off, "ICE" for icemaking, and "SERVICE" to activate the service switch. 2. Service Switch When the control switch is in the "SERVICE" position, the control switch supplies power to the service switch. The service switch has three positions: "DRAIN," "CIRC." and "WASH." Note: 1. When the service switch is active (control switch in the "SERVICE" position), power is supplied to the pump motor in all three positions. -
Page 26: Technical Information
III. Technical Information A. Water Circuit and Refrigeration Circuit... -
Page 27: Wiring Diagrams
B. Wiring Diagrams 1. KMS-2000MLH with SRK-20H... -
Page 28: Kms-2000Mlh With Srk-20H3
2. KMS-2000MLH with SRK-20H3... -
Page 29: Wire Harness Connections
3. Wire Harness Connections... -
Page 30: Performance Data
C. Performance Data 1. KMS-2000MLH with SRK-20H APPROXIMATE ICE WATER TEMP. (ºF/ºC) AMBIENT TEMP. PRODUCTION PER 24 HR. (ºF/ºC) 50/10 70/21 90/32 70/21 1861 1842 1722 80/27 1846 1816 1645 90/32 1842 1795 1643 lbs./day kg./day 100/38 1786 1759 1504... -
Page 31: Kms-2000Mlh With Srk-20H3
2. KMS-2000MLH with SRK-20H3 APPROXIMATE ICE WATER TEMP. (ºF/ºC) AMBIENT TEMP. PRODUCTION PER 24 HR. (ºF/ºC) 50/10 70/21 90/32 70/21 1910 1850 1767 80/27 1864 1772 1687 1706 90/32 1850 1620 lb./day kg./day 100/38 1833 1686 1541 APPROXIMATE ELECTRIC 70/21... -
Page 32: 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 33 1) Turn off the power supply, then access the control box. Clear any ice from BC. 2) Turn on the power supply, then move the control switch to the "ICE" position. A 5-second delay occurs. CB red "POWER OK" LED turns on. If CB red "POWER OK" LED is flashing (indicating a full bin), clear ice away form BC. If bin is empty, see "IV.C.1. Bin Control Check." 3) 1-Minute Fill Cycle – LED 8 is on. WV energizes. After 1 minute, CB checks for a closed F/S. If F/S is closed, harvest cycle begins. If closed, continue to step 4. If open, WV remains energized through additional 1-minute fill cycles until water fills the water tank and closes F/S (low water safety).
- Page 34 When the 5-minute short cycle protection timer terminates, CB monitors UF/S for a continuous 15 second open condition. With no UF/S on the KMS-2000MLH, CB 1-minute default refill timer starts (LED 9 is on during CB 1-minute default refill).
- Page 35 6) Pump-Out Cycle – (10 second pump-out) – LEDs 5, 6, 4, and 7 are on. Comp and FMRs remain energized. HGVs energize. LLVs de-energize. PM de-energizes for 2 seconds, then PM and DV energize for 10 seconds. Diagnosis: PM Operation: If PM does not energize, confirm S2 dip switch 1 is in the factory default position. See "II.C.3.g) Pump-Out/Drain Selector (S2 dip switch 1). Check diagnostic connector pin #3 (V wire) to a neutral (W wire) for 115VAC.
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Page 36: Control Board Check
1 through 6 are in the factory default position. S1 dip switch 1 through 6 are cleaning adjustments and the settings are flexible. For factory default settings, see "II.C.3.a) Default Dip Switch Settings." 2) The KMS-2000MLH utilizes CB version 2.5. See the label located on CB for CB version or follow the steps below to determine CB version. a) With the control switch in the "OFF" position, press and hold the "OUTPUT TEST"... -
Page 37: Bin Control Check And Cleaning
5) Utilize the diagnostic connector (Fig. 1.) to verify output voltage from CB to components. With the unit in the cycle to be tested, check CB output voltage from the corresponding terminal on the diagnostic connector to a neutral (W wire). If output voltage is not present and the appropriate LED is on, replace CB. -
Page 38: Bin Control Cleaning
6) Remove the actuator paddle from the switch mount. See Fig. 2. 7) Wipe down BC with a mixture of 1 part Actuator Paddle Hoshizaki "Scale Away" and 25 parts warm water. Rinse the parts thoroughly with Magnet clean water. 8) Reassemble BC and replace it in its correct position. -
Page 39: Float Switch Check And Cleaning
D. Float Switch Check and Cleaning A single 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. The 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. -
Page 40: Float Switch Cleaning
Shaft Housing 10) 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. Float 11) Reassemble F/S assembly and replace... -
Page 41: 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 top and right side panels. 4) Remove the thermistor from the suction line. 5) Immerse the thermistor sensor portion in a glass containing ice and water for 2 or 3 minutes. -
Page 42: 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 S1 dip switch 7 through 10 and S2 dip switch 1 through 6 are in the factory default position. S1 dip switch 1 through 6 are cleaning adjustments and the settings are flexible. For factory default settings, see "II.C.3.a) Default Dip Switch Settings." 1. No Ice Production No Ice Production - Possible Cause 1. -
Page 43: Freeze-Up
24. Water System a) Water leaks causing short freeze time. 2. Freeze-Up Defrost and clean the unit prior to diagnosing a 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 44 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 (S1 dip switch 1 & 2) set too short. See "II.C.3. Controls and b) Harvest pump timer (S1 dip switch 7 & 8) not in factory default Adjustments" and "IV.B. Control position.
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Page 45: 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 46 Low Ice Production - Possible Cause 8. Refrigerant Charge a) Low. 9. Thermostatic Expansion Valves a) Bulb loose. b) Defective. 10. Compressor a) Inefficient or off. 11. Pump Motor a) RPM too slow. b) Impeller damaged. 12. Liquid Line Valves (KMS & SRK) a) Erratic or closed. 13.
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Page 47: 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 48: 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. 3. Do not use silver alloy or copper alloy containing arsenic. 4. Use an electronic leak detector or soap bubbles to check for leaks. Add a trace of refrigerant to the system (if using an electronic leak detector), and then raise the pressure using nitrogen gas (140 PSIG). - Page 49 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.
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Page 50: Important Notes For Component Replacement
Pump Motor Install a new capacitor. Thermistor • Attach the new thermistor to the suction line in the same location as the previous thermistor. • 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... -
Page 51: 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 52 8) In bad or severe water conditions, clean the float switch as described below. Otherwise, continue to step 9. a. Remove the right side panel. b. Disconnect 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. c. Remove the retainer rod from the bottom of the float switch housing, then remove the float. Be careful not to bend the retainer rod excessively when removing it d. Wipe down the float switch assembly housing, shaft, float, and retainer rod with cleaning solution. Clean the inside of the rubber boot and hose with cleaning solution. Rinse the parts thoroughly with clean water. e. Reassemble the float switch assembly and replace it and the rubber boot in their correct positions. Reconnect the flush tube. f. Replace the right side panel in its correct position. 9) Remove the insulation panel by removing the thumbscrews, then pour the cleaning solution into the water tank.
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Page 53: Sanitizing Procedure - Following Cleaning Procedure
2. Sanitizing Procedure - Following Cleaning Procedure 1) Dilute 2.5 fl. oz. (74 ml or 5 tbs) of a 5.25% sodium hypochlorite solution (chlorine bleach) with 5 gal. (19 l) of warm water. 2) Remove the insulation panel if it is in its normal position. 3) Pour the sanitizing solution into the water tank. 4) Move the service switch to the "WASH" position. 5) Replace the insulation panel and the front panel in their correct positions. 6) Turn on the power supply to start the sanitizing process. -
Page 54: 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 55: Preparing The Icemaker For Long Storage
C. Preparing the Icemaker for Long Storage NOTICE 1. When storing the icemaker for an extended time or in sub-freezing temperatures, follow the instructions below to prevent damage. 2. To prevent damage to the water pump, do not operate the icemaker with the control switch in the "SERVICE" position when the water tank is empty. - Page 56 2. Remove the water from the water tank: 17) Remove the insulation panel and front frame. 18) Remove the 4 hoses connected to the water tank. Allow the tank and hoses to drain completely. See Fig. 5. 19) Remove all ice from the dispenser unit/storage bin and clean the dispenser unit/storage bin liner using a neutral cleaner.