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2. Thermostatic Expansion Valve Evaporator Inlet Water Valve X12 Relay drain valve relay X10 Relay pump motor relay X11 Relay inlet water valve relay Drain Valve Drier Pump Motor Float Switch CM Control Board Control Box Liquid Line Valve Bin Control Thermostat Service Switch Bin Control Control Switch I Insulation i Bin Control Cover Bin Control Bracket iy Bin Control Bulb Holder 2 Condensing Unit Condenser Liguid Line Valve E Hot Gas Valve Headmaster Start Relay Shut off Valve Low Side m N 5 Fuse T s eD l i ape Capacitors ES I Bart o Magnetic ete p 2 Contactor Ses T S Control Box Junction Box Fan Motors and Fan Blades Shut off Valve High Side Crankcase Heater Receiver Compressor Accumulator Discharge Line Thermostat Model Shovvn SRK 12H 4 urens it Diagram ircul B Water Refrigeration C 18180 1 eur e amp ieuosiq Ns Jeuieang A BA eur pinbi1 YOUMS ainssalg yBIH A BA SEE 10H Jossaidwoy Joyejnunooy eur abieuosiq eur _ uonong SHABA uoisuedx3 oneisouueu ABA eur pinbr
3. 3 Spray Tubes andor Spray Guides b Out of position 4 Water Supply a Low water pressure b External water filters clogged c Insufficient water line size Minimum 3 8 nominal ID copper water tubing or equivalent 5 Inlet Water Valve a Defective 22 6 Float Switch and Cleaning 8 Control Board See Ill Controls and Harvest pump timer S4 dip switch 7 not in factory default position Adjustments and II C Control Board Check 9 Bin Control a Bulb out of position See II D Bin Control Check b Defective 10 Thermistor a Loose disconnected or defective See ILE Thermistor Check 1 Evaporator a Scaled up 2 Spray Tubes and or Spray a Dirty Guides Out of position 3 Refrigerant Charge Low 4 Control Board a Freeze timer S4 dip switch 9 amp 10 set incorrectly See C Control Board Check 5 Inlet Water Valve a Leaking by 6 Float Switch Float does not move freely See II E Float Switch Check Defective and Cleaning 7 Pump Motor RPM too slow Impeller damaged 8 Thermostatic Expansion Valve a Bulb loose or defective 10 Liquid Line Valves KMS amp SRK 23 3 Low Ice Production Low Ice Production Possible Cause Long Harvest Cycle 1 Evaporator a Scaled up 2 Spray Tubes and or Spray Guides b Out of position 3 Refrigerant Charge 4 Water Supply b External water filters clogged Insufficient water line size Mi
4. harvest pump timer LED 2 on ex 5 a e X12 Relay and Drain Valve K1 Connector Pin 2 ig m pump out LED 2 off x4 6 O Inlet Water Valve and K1 Connector Pin 3 EES X11 Relay e LED 3 X3 Relay D je BR Supply Voltage LED 3 on p e pen K1 Connector Pin 5 energized during harvest x O pump timer LED 3 off K1 Connector Pin 4 energized in freeze Jo Connector LED 4 X4 Relay Control Transformer K1 Connector Pin 6 10 5VAC LED 1 X1 Relay K1 Connector Pin 1 9 G Control Board Part Number 2A3792 01 26 B LED Lights and Audible Alarm Safeties At startup a 5 sec delay occurs while CB conducts an internal timer check A beep occurs when the control switch KMS is moved to the ICE position The red POWER OK 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 Note that the order of the LEDs from the outer edge of the control board is 1 4 3 2 For details see II C Control Board Check LED Lights and Components Energized Time LEDs are On o components win Mex Ae 1 Minute Fill Cycle Em Harvest Pump Timer Comp FMRs harvest pump PM HGVs timer setting Freeze Cycle Comp FMRs 5min freeze timer 30 to 35 min PM LLVs setting Pump Out Cycle 3 Comp FMRs 10sec 20 sec PM HGVs DV Built in saf
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6. 3 KMS 1122MLH with SRK 12H3
7. 40 VIII Technical Information 41 A Specification SA USI aa 41 1 KMS 1122MLH with SRK 12H a a an dn bd 41 2 KMS 1122MLH with SRK 12H93 42 I ORK A2 NER 43 255 aaa aaa I aaa da a aaa NERO DUE 44 B Peformance Dala TETTE 45 T KMS 1122MLH with SRI bada l iato a trt 45 2 KMS 1122MLH with SRK 12H93 46 C Wiring ATA S INT 47 1 Wire Harness Connections a a anc etd 47 2 KMS 1122MLH with SRK 12H 48 3 KMS 1122MLH with SRK 12H3 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 A WARNING Indicates a hazardous situation which could result in death or serious injury NOTICE Indicates a situation which could result in damage to the appliance or property IMPORTANT Indicates important information about the use and care of the appliance A WARNING The appliance should be destined only to the use for which it has been expressly conceived Any other use should be considered improper and therefore dangerous The manufacturer cannot
8. Auto Reset Overload Protector Internal Thermal Protection Auto Reset High Pressure Svvitch Auto Reset Discharge Line Thermostat Headmaster C P R 160 PSI 16 Ib 5 oz 7400g Condensing Unit 14 Ib 14 oz 7200g Icemaker 0 Ib 7 oz 200g High 467 PSIG Lovv 230 PSIG VOLTAGE RANGE 187 253VAC AMBIENT TEMP Outdoor use 20 122 F Leg 2 pcs Hex Head Bolt w Washer M8x16 8 pcs Hex Nut M8 8 pcs Compatible KMS Icemaker Note We reserve the right to make changes in specifications and design without prior notice 43 4 SRK 12H3 AC SUPPLY VOLTAGE AMPERAGE MINIMUM CIRCUIT AMPACITY MAXIMUM FUSE SIZE EXTERIOR DIMENSIONS WxDxH DIMENSIONS INCLUDING LEGS WxDxH EXTERIOR FINISH WEIGHT CONNECTIONS ELECTRIC REFRIGERANT COMPRESSOR CONDENSER COMPRESSOR PROTECTION FAN MOTOR PROTECTION REFRIGERANT CIRCUIT PROTECTION REFRIGERANT CONTROL REFRIGERANT CHARGE DESIGN PRESSURE OPERATING CONDITIONS ACCESSORIES SUPPLIED REQUIRED 208 230 60 3 115VAC Supplied to KMS via Factory Wire Harness 10 5A 5 Min Freeze AT 104 F WT 80 F 20A 20A 50 x17 x28 1270x432x711 mm 52 3 8 x19 1 2 x43 1330x495x1092 mm Galvanized steel Net 230 Ibs 104 kg Shipping 273 Ibs 124 kg Main Povver Supply Permanent Connection SRK to KMS Wire Harness Connection 1 1 8 12 UNF Fitting 11 Parker Liquid line 1 1 16 12 UNF Fitting 10 Parker Hermetic Model CS12K6E TF5 255 Air Cooled Fin an
9. 3 Place the control switch in the SERVICE position Then place the service switch in the DRAIN position 4 Replace the front panel in its correct position then turn on the power supply for 2 min 5 Turn off the power supply 6 Remove the front panel then move the control switch to the OFF position 7 Remove the control bor cover then disconnect FS connector from CB black K5 connector 8 Check for continuity across FS leads With the water tank empty FS should be open If open continue to step 10 If closed follow the steps in II E 2 Float Switch Cleaning After cleaning FS check it again Replace if necessary 9 Reconnect FS connector to CB black K5 connector then replace the control box cover in its correct position 10 Move the control switch to ICE position Replace the front panel 11 Turn on the power supply 12 As water fills the water tank FS contacts should close After 1 min the 1 min fill cycle should end and the initial harvest cycle should begin If harvest cycle doesn t start after 1 min check continuity of FS with water tank full If open replace FS If closed and harvest cycle has not started replace CB 13 Once the harvest cycle starts turn off the power supply 14 Remove the front panel then move the control switch to the OFF position 15 Remove the control box cover then disconnect FS connector from CB black K5 connector 16 Check for continuity across FS leads With the
10. Control Board Check Before replacing a 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 Once reset the appliance starts at the 1 min fill cycle For audible alarm information see III B LED Lights and Audible Alarm Safeties 1 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 III C 1 Default Dip Switch Settings 2 Move the control switch to the ICE position If the red POWER OK LED is on CB control voltage is good continue to step 3 If the red POWER OK LED is off check CT secondary circuit CT output is 10 5VAC at 115VAC primary input If the secondary circuit has proper voltage and the red LED is off replace CB If the secondary circuit does not have proper voltage check CT primary circuit Check for 115VAC at CB K1 connector pin 10 BR to a neutral W for 115VAC Always choose a neutral W to establish a good neutral connection when checking voltages For additional checks see II G 1 No Ice Production 3 The O
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12. 4 is off replace CB Check that LED 3 turns on and PM is energized for the last 50 sec of harvest cycle If LED 3 is on and PM is not energized check for 115VAC at CB K1 connector pin 5 DBU If 115VAC is present and PM is not energized check for 115VAC at X10 relay coil If 115VAC is present check for 115VAC at X10 relay terminal 4 R to a neutral W If 115VAC is not present check X10 relay coil continuity and contact continuity If 115VAC is present check control switch contact continuity between terminals 6 R and 5 R If contacts are open replace control switch If contacts are closed and 115VAC is present between control switch terminal 5 R and neutral W check PM capacitor and motor winding continuity If the thermistor reading is in proper range and CB fails to terminate the harvest cycle replace CB If 1 min fill cycle starts after harvest see ILE Float Switch Check and Cleaning 13 6 Freeze Cycle LED 1 is on Comp FMRs and PM continue LLVs energize HGVs and X10 relay de energize The appliance is held in freeze by a 5 min short cycle protection timer When FS opens the freeze cycle terminates Note CB K1 connector pin 5 DBU de energizes and K1 connector pin 4 R energizes to prevent PM interruption Freeze Cycle Diagnosis During the first 5 min of freeze confirm evaporator is cooling If not confirm LLVs energize and HGVs de energize not bypassing If LLVs do not energize check for 115VA
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14. KMS 1122MLH with SRK 12H3 APPROXIMATE ICE AMBIENT TEMP PRODUCTION PER 24 HR F C 70 21 70 21 508 492 80 27 496 471 90 32 492 454 Ibs day _kg day 100 38 483 445 APPROXIMATE ELECTRIC 70 21 CONSUMPTION 80 27 90 32 watts 100 38 APPROXIMATE WATER 70 21 CONSUMPTION PER 24 HR 80 27 90 32 gal day m day 100 38 FREEZING CYCLE TIME 70 21 80 27 90 32 min 100 38 HARVEST CYCLE TIME 70 21 80 27 90 32 min 100 38 HEAD PRESSURE 70 21 80 27 90 32 PSIG kg em G 100 38 SUCTION PRESSURE 70 21 80 27 90 32 PSIG kg cm G 100 38 TOTAL HEAT OF REJECTION FROM CONDENSER 21 000 BTU h AT 90 F 32 C WT 70 F 219C CONDENSER VOLUME 226 CU IN SRK 12H3 Note 1 Pressure data is recorded at 5 min into freezing cycle The data not in bold should be used for reference only 2 We reserve the right to make changes in specifications and design without prior notice 46 C Wiring Diagrams 1 Wire Harness Connections 3 E e 19JOIA A yuld d eui pinbil ATT 586 10 ueoJ6 H5 punoJ6 qN59 UMOJQ Hg p1eoq o3u02 g5 yoelq pu 7 2 40102 9JIM SE p uuo Hun 19xeule2 SIN suon uuo2 ssauJeH AIM aNd 8 N el o ennewN TEL H amp 8 T AN pe12euuoo pjalj nun Bursuepuo Mus H M ya ATI ASH
15. Lockout Tagout to prevent the power supply from being turned back on inadvertently CHOKING HAZARD Ensure all components fasteners and thumbscrews are securely in place after any maintenance is done to the icemaker Make sure that none have fallen into the dispenser unit ice storage bin Maintenance Schedule BUG Daily Scoop Clean the ice scoop using a neutral cleaner Rinse thoroughly after cleaning Monthly External Water Check for proper pressure and change if necessary Filters Icemaker Exterior Wipe down with a clean soft cloth Use a damp cloth containing a neutral cleaner to wipe off oil or dirt build up Clean any chlorine staining rust colored spots using a non abrasive cleanser Condenser Inspect Clean if necessary by using a brush or vacuum cleaner More frequent cleaning may be required depending on location Inspect the water hoses and clean replace if necessary Yearly Icemaker and Clean and sanitize per the cleaning and sanitizing instructions provided Dispenser Unit Ice in the instruction manual or maintenance label on the icemaker Storage Bin Liner system Clean the water supply inlet screen 38 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
16. be held responsible for injury or damage resulting from improper incorrect and unreasonable use Failure to service and maintain the appliance in accordance with this manual will adversely affect safety performance component life and warranty coverage and may result in costly water damage To reduce the risk of death electric shock serious injury or fire follow basic precautions including the following Only qualified service technicians should install and service the appliance The appliance must be installed in accordance with applicable national state and local codes and regulations Failure to meet these code requirements could result in death electric shock serious injury fire or damage to the appliance To reduce the risk of electric shock do not touch the control switch or service switch with damp hands 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 Place the KMS disconnect if applicable in the OFF position Lockout Tagout to prevent the power supply from being turned back on inadvertently Do not make any alterations to the appliance Alterations could result in electric shock injury fire or damage to the appliance The appliance is not intended for use by persons including children with reduced physical sensory or mental capabilities or lack of experience and knowledge unless they have been given sup
17. in the prohibited range the appliance operates continuously even if the ice storage bin is filled with ice Setting in the prohibited range may result in severe damage to 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 Note e When BC switch is open CB red POWER OK LED is off CB yellow BC OPEN LED is on if CB red K4 connector does not have the jumper in place 1 2 3 4 5 6 Turn off the power supply Remove the front panel then move the control switch to the OFF position Clear any ice away from BC bulb Remove the control box cover then disconnect BC wires from BC switch Hold your hand around BC bulb to warm it up Check for continuity across BC switch If closed continue to step 6 If open adjust or replace BC 7 With the multimeter test leads still in place hold ice on BC bulb to lower the temperature Within 10 sec BC switch should open If it remains closed adjust or replace BC Legend BC bin control CB control board wae a E 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 adiustment is required 1 Float Switch Check To check FS follow the steps below 1 Turn off the power supply 2 Remove the front panel
18. next step 7 Replace the thermistor in its correct position See IV B Component Service Information 8 Reconnect the thermistor connector to CB white K3 connector 9 Replace the control box cover in its correct position 10 Move the control switch to the ICE position 11 Replace the front panel in its correct position 12 Turn on the power supply 13 Once the harvest cycle starts Comp energizes begin timing the harvest cycle 14 The harvest timer and harvest cycle should terminate within 2 to 5 min If the harvest cycle does not terminate within 2 to 5 min replace CB Legend CB control board Comp compressor 20 G 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 C Control Board Check 1 No Ice Production 1 Power Supply a Off blown fuse or tripped breaker Ku GE b Not within specifications 2 Main Transformer Voltage tap switch not set to proper voltage 3 phase SRK No neutral W to ground 0VAC W to ground should be 60VAC 208 230VAC 115VAC 3 Water Supply Water supply off or improper water pressure 4 Fuse SRK Control Box Blown 5 High Pressure Switch SRK Bad contacts 6 Discharge Line Thermostat BAR c Defective L d Hot gas valves open e Dirty condenser Condensing u
19. position when the water tank is empty When the appliance is not used for two or three days under normal conditions it is sufficient to move the control switch to the OFF position When storing the appliance for an extended time or in sub freezing temperatures follow the instructions below 1 Remove the water from the icemaker water line 1 Turn off the power supply then remove the front panel 2 Close the icemaker water supply line shut off valve and open the icemaker water supply line drain valve 3 Allow the line to drain by gravity 4 Attach a compressed air or carbon dioxide supply to the icemaker water supply line drain valve 5 Make sure at least 3 min 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 then turn on the power supply 6 Blow the icemaker water supply line out using the compressed air or carbon dioxide supply 7 Close the icemaker water supply line drain valve 2 Remove the water from the water tank 1 Turn off the power supply 2 3 4 5 Remove the front apron top left side and side insulation panels Move the control switch to the OFF position Remove the drain plug Allow the water tank to drain o A Replace the drain plug in its correct position Be careful not to cross thread the drain plug 6 Replace the side insulation left side top apron and front pan
20. 90 1066 484 985 447 910 413 100 1046 474 967 439 841 381 Crescent Cube 17 Ib 7 7 kg 880pcs 90 70 F 70 50 F 1910 4 65 1830 4 00 192 19 5 473 43 0 YES 22 x18 base x31 25 559x457x794 mm Stainless Steel Stainless Steel Rear Net 116 Ib 53 kg Shipping 150 Ib 68 kg VVire Harness Connection from SRK to KMS nlet 1 2 FPT Outlet 3 4 FPT Liquid Line 1 1 16 12 UNF FITTING 10 PARKER Suction Line 1 1 8 12 UNF FITTING 11 PARKER Float Svvitch Hot Gas and VVater Thermistor and Timer Timer Controlled Overflovv Pipe and Float Svvitch N A Thermostatic n SRK Air Cooled Remote Condensing Unit SRK 12H Vertical Type Stainless Steel and Copper Thermostatic Expansion Valve Headmaster C P R in SRK 12H 160 PSI R404A 16 Ib 5 oz 7400g Icemaker 0 Ib 7 1 oz 200g Cond Unit 15 Ib 14 oz 7200g High 467PSIG Lovv 230PSIG High Voltage Cut Out Internal Auto Reset High Pressure Svvitch in SRK 12H Auto Reset Discharge Line Thermostat in SRK 12H Float Svvitch N A Dispenser Unit or Ice Storage Bin SRK 12H Remote Condensing Unit VOLTAGE RANGE SRK 12H 187 253VAC AMBIENT TEMP 45 100 F WATER SUPPLY TEMP 45 90 F WATER SUPPLY PRESSURE 10 113 PSIG Note We reserve the right to make changes in specifications and design without prior notice 41 2 KMS 1122MLH with SRK 12H3 AC SUPPLY VOLTAGE 115VAC Supplied by SRK 12H3 via Factory Supplied Wire H
21. C at CB K1 connector pin 3 BK to a neutral W If 115VAC is present check coil voltage and continuity of both LLVs KMS and SRk Confirm that both HGVs KMS and SRk are de energized and closed If evaporator is still not cooling check TXVs and HM for proper operation Check for proper appliance pressures or an inefficient Comp See VIII B Performance Data If PM de energizes once freeze begins check for 115VAC at CB K1 connector pin 4 R to a neutral W If 115VAC is not present replace CB Freeze Termination Diagnosis Disconnect CB black K5 connector When 5 or more min have elapsed in the freeze cycle the appliance should switch out of freeze After the appliance switches out of freeze reconnect CB black K5 connector If the appliance remains in freeze with FS disconnected replace CB To check FS see Il E Float Switch Check and Cleaning If water tank is empty before 5 min timer terminates and freeze cycle is short check that DV is not leaking by or energized water flowing down the potable drain If DV is energized check X12 relay terminal 44 GY for 115VAC If 115VAC is present and LED 1 is on replace CB Note Normal freeze cycle will last 30 to 35 min depending on model and conditions Cycle times and pressures should follow performance data provided in this manual See VIII B Performance Data 7 Pump Out Cycle LEDs 1 3 and 2 are on 10 20 second pump out At the factory setting the 1st pump out
22. ED Lights and Audible Alarm 27 C Settings and Ad Sa 28 1 Default Dip Switch SIT es caen ad D R Ba n aseo ayaz yaya azizi 28 2 Harvest Timer 94 dip switch 29 3 Pump Out Timer S4 dip switch 3 amp 4 2 29 4 Pump Out Frequency Control S4 dip switch 5 amp 6 30 5 Harvest Pump Timer S4 dip switch 7 30 6 Factory Use S4 dip switch 8 30 7 Freeze Timer S4 dip switch 9 amp 10 uu s s 31 8 Float Switch Selector 55 dip switch 1 31 9 Refill Counter S5 dip switch 2 through 5 32 D Control Switch and Service Switch arsa 33 IV Refrigeration Circuit and Component Service Information 34 A Refrigeration Circuit Service Information 34 B Component Service Information b Rs id 37 Wi MANE eR M 38 VI Preparing the Appliance for Periods of Non USse 39 M LL oc MT
23. Hoshizaki America Inc Modular Crescent Cuber Serenity Series Model KMS 1122MLH with SRK 12H 3 SERVICE MANUAL A Superior Degree of Reliability www hoshizaki com Number 73194 Issued 4 4 2013 A WARNING Only gualified service technicians should install and service the appliance To obtain the name and phone number of your local Hoshizaki Certified Service Representative visit www hoshizaki com No service should be undertaken until the technician has thoroughly read this Service Manual Failure to service and maintain the appliance in accordance with this manual will adversely affect safety performance component life and warranty coverage and may result in costly water damage Proper installation is the responsibility of the installer Product failure or property damage due to improper installation is not covered under warranty 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 770 487 3360 E mail techsupport hoshizaki com HOSHIZAKI AMERICA INC 618 Highway 74 South Peachtree City GA 30269 Attn Hoshizaki Technical Support Department Web Site www hoshizaki c
24. RCUIT PROTECTION Auto Reset High Pressure Switch in SRK 12H3 Auto Reset Discharge Line Thermostat in SRK 12H3 LOW WATER PROTECTION Float Switch ACCESSORIES SUPPLIED N A REQUIRED Dispenser Unit or Ice Storage Bin SRK 12H3 Remote Condensing Unit OPERATING CONDITIONS VOLTAGE RANGE SRK 12H3 187 253VAC AMBIENT TEMP 45 100 F WATER SUPPLY TEMP 45 90 F WATER SUPPLY PRESSURE 10 113 PSIG Note We reserve the right to make changes in specifications and design without prior notice 42 3 SRK 12H AC SUPPLY VOLTAGE AMPERAGE MINIMUM CIRCUIT AMPACITY MAXIMUM FUSE SIZE EXTERIOR DIMENSIONS VVxDxH DIMENSIONS INCLUDING LEGS WxDxH EXTERIOR FINISH WEIGHT CONNECTIONS ELECTRIC REFRIGERANT COMPRESSOR CONDENSER COMPRESSOR PROTECTION FAN MOTOR PROTECTION REFRIGERANT CIRCUIT PROTECTION REFRIGERANT CONTROL REFRIGERANT CHARGE DESIGN PRESSURE OPERATING CONDITIONS ACCESSORIES SUPPLIED REQUIRED 208 230 60 1 115VAC Supplied to KMS via Factory Wire Harness 11 2 A 5 Min Freeze AT 104 F WT 80 F 20A 20A 50 x 17 x 28 1270 x 432 x 711 mm 52 3 8 x 19 1 2 x 43 1330 x 495 x 1092 mm Galvanized steel Net 230 Ibs 104 kg Shipping 273 Ibs 124 kg Main Povver Supply Permanent Connection SRK to KMS VVire Harness Connection 1 1 8 12 UNF Fitting 11 Parker 1 1 16 12 UNF Fitting 10 Parker Hermetic Model CS12K6E PFV 255 Air Cooled Fin and Tube Type Suction line Liquid line
25. UTPUT TEST button provides a relay sequence test Make sure the control switch is in the ICE position then press the OUTPUT TEST button The correct lighting sequence is 1 4 3 2 Note that the order of the LEDs from the outer edge of CB is 1 4 3 2 Components e g compressor will cycle during the test Following the test the appliance resumes operation If the LEDs do not light as described above replace CB 4 To verify voltage output from CB to the components slide CB K1 connector out far enough to allow multimeter lead contact With the appliance 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 5 Check CB control connectors K3 K4 and K5 for correct VDC per table below Note Pin 1 is DC ground GND on each connector K3 Thermistor K4 Jumper K Float Switch Pas voc Fin voc s 1 to 2 5VDC 1 to 2 1 to 2 1 2VDC 1 to 3 5VDC 1 to 3 1 to 3 2VDC 2 to 3 OVDC 2 to 3 2 to 3 1 2VDC Pa Thermistor ies RED Jumper Legend CB control board CT control transformer BLACK Float Switch T D 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
26. VAC at X12 relay terminal 4 GY to a neutral W If 115VAC is not present confirm 115VAC at X12 relay terminal 6 DBU If 115VAC is present on X12 relay terminal 6 DBU and not on X12 relay terminal 4 GY replace X12 relay If 115VAC is present on X12 relay terminal 4 GY check DV coil continuity If open replace DV Next remove DV housing and check clean DV assembly Make sure the drain line is not clogged 8 Normal Harvest Cycle Same as the initial harvest cycle Return to step 5 Note Icemaker continues to cycle until BC is satisfied or power is switched off The appliance always restarts at the 1 min fill cycle 9 Shutdown 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 Diagnosis See II D Bin Control Check Legend BC bin control CB control board Comp compressor CT control transformer DLT discharge line thermostat DV drain valve FMRs fan motors remote FS float switch HGVs hot gas valves HM headmaster HPS high pressure switch LLVs liquid line valves MC magnetic contactor MT main transformer PM pump motor TXVs thermostatic expansion valves WV inlet water valve X10 pump motor relay X11 inlet water valve relay X12 drain valve relay 15 C
27. arness APPROXIMATE ICE PRODUCTION i PER 24 HR 5 7 90 Ib day kg day Reference without marks SHAPE OF ICE Crescent Cube ICE PRODUCTION PER CYCLE 17 1 Ib 7 7 kg 880pcs ELECTRIC amp WATER CONSUMPTION 90 70 F 70 50 F KMS SRK COMBINED ELECTRIC W kWH 100 Ib 1920 4 60 1790 3 83 WATER gal 24HR gal 100 Ib 195 19 5 451 40 3 ENERGY STAR 2 0 YES EXTERIOR DIMENSIONS WxDxH 22 x18 base x31 25 559x457x794 mm EXTERIOR FINISH Stainless Steel Stainless Steel Rear WEIGHT Net 116 Ib 53 kg Shipping 150 Ib 68 kg CONNECTIONS ELECTRIC Wire Harness Connection from SRK to KMS WATER SUPPLY Inlet 1 2 FPT DRAIN Outlet 3 4 FPT REFRIGERATION Liquid Line 1 1 16 12 UNF FITTING 10 PARKER Suction Line 1 1 8 12 UNF FITTING 11 PARKER CUBE CONTROL SYSTEM Float Switch HARVESTING CONTROL SYSTEM Hot Gas and Water Thermistor and Timer ICE MAKING WATER CONTROL Timer Controlled Overflow Pipe and Float Switch COOLING WATER CONTROL N A BIN CONTROL SYSTEM Thermostatic COMPRESSOR In SRK CONDENSER Air Cooled Remote Condensing Unit SRK 12H3 EVAPORATOR Vertical Type Stainless Steel and Copper REFRIGERANT CONTROL Thermostatic Expansion Valve Headmaster C P R in SRK 12H3 160 PSI REFRIGERANT CHARGE R404A 16 Ib 5 oz 7400g Icemaker 0 Ib 7 1 oz 200g Cond Unit 15 Ib 14 oz 7200g DESIGN PRESSURE High 467PSIG Low 230PSIG CONTROL BOARD CIRCUIT PROTECTION High Voltage Cut Out Internal REFRIGERANT CI
28. ble freeze up issues Upon termination of the freeze timer the control board initiates the harvest cycle After 2 consecutive freeze timer terminations the control board shuts down the appliance In this case see II G 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 Dip Switch Setting Time No 9 No 10 min OFF OFF 60 50 FF ON 8 Float Switch Selector S5 dip switch 1 NOTICE Do not adjust This must be left in the factory default position or the appliance will not operate correctly On appliances with a double float switch the float switch selector determines which float switch upper or lower the control board monitors for refill initiation during the freeze cycle The refill counter S5 dip switch 2 through 5 determines the number of refills The KMS 1122MLH uses a single float switch and does not refill during the freeze cycle S5 Dip Switch Setting Refill Initiation with Nei Float Switch Type Double Float Switch Single or Double Lower Float Switch Upper Float Switch 31 9 Refill Counter S5 dip switch 2 through 5 NOTICE Do not adjust These must be left in the factory default position or the appliance will not operate correctly Factory set S5 dip switch 2 through 5 allows for
29. ces on the control board or the back of the control board Do not change wiring and connections Do not misconnect terminals Do not short out power supply to test for voltage Always replace the whole control board assembly if it goes bad 25 A Control Board Layout G Control Board 4 Dip Switch Bin Control Switch ALARM RESET Button S Ip SWI Closed LED green On with K4 jumper in place OUTPUT TEST Button K7 Connector Factory Use Only __ ALARM RESET o D o 3 Bin Control Switch a 0r R Open LED yellow a Not used this model a K3 Connector white SC Thermistor Part Number R K4 Connector red Jumper K6 Connector gt K5 Connector black Float Switch gt J 2 me e S5 Dip Switch Label Alarm Buzzer control board revision e mo S level indicated on label e Power LED red lt GE BBB o lg on side of relay n 12345 lt K1 Connector a lights when 10 5VAC is supplied to K2 connector Relay LEDs 122 9 V Magnetic Contactor LED 2 7 Os 2 P Hot Gas Valves 7 j Ws ard SRK ana Dow X10 Relay 7 4 ae a x 5133 BK Liquid Line Valves nerdized P 4 R Pump Motor freeze 15 X3 Zal n 5 DBU Pump Motor e LED 2 X2 Relay
30. ctory 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 Dip SwitchNo 1 2 3 4 5 6 7 8 9 10 Dip Switch No 1 z slals S4 Dip Switch S5 Dip Switch Freeze Timer 9 amp 10 Do Not Adjust Factory Use 8 gt Refill Counter rm Z 2 through 5 Harvest Pump Timer 7 Do not adjust Float Switch Selector 1 28 2 Harvest Timer S4 dip switch 1 amp 2 The harvest timer starts counting when the thermistor reaches 48 F 9 C at the evaporator outlet and the control board reads 3 9 kO from the thermistor The harvest timer is factory set and generally no adjustment is required 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 for recommendations Keep in mind that setting the harvest timer to a longer setting decreases 24 hr production The pump out timer S4 dip switch 3 amp 4 acts in place of the harvest timer during cycles with a pump out For details see NI C 3 Pump Out Timer S4 dip switch 3 amp 4 below Dip Switch Setting Time sec OFF 3 Pump Out Timer S4 dip swi
31. d Tube Type Suction line Auto Reset Overload Protector Internal Thermal Protection Auto Reset High Pressure Switch Auto Reset Discharge Line Thermostat Headmaster C P R 160 PSI 16 Ib 5 oz 7400g Condensing Unit 14 Ib 14 oz 72009 Icemaker 0 Ib 7 oz 200g High 467 PSIG Low 230 PSIG VOLTAGE RANGE 187 253VAC AMBIENT TEMP Outdoor use 20 122 F Leg 2 pcs Hex Head Bolt w Washer M8x16 8 pcs Hex Nut M8 8 pcs Compatible KMS Icemaker Note We reserve the right to make changes in specifications and design without prior notice 44 B Performance Data 1 KMS 1122MLH with SRK 12H APPROXIMATE ICE AMBIENT TEMP PRODUCTION PER 24HR rc 70 21 80 27 90 32 lbs day kg day 100 38 APPROXIMATE ELECTRIC 70 21 CONSUMPTION 80 27 90 32 watts 100 38 APPROXIMATE WATER 70 21 CONSUMPTION PER 24 HR 80 27 90 32 gal day m3 day 100 38 FREEZING CYCLE TIME 70 21 80 27 90 32 min 100 38 HARVEST CYCLE TIME 70 21 80 27 90 32 min 100 38 HEAD PRESSURE 70 21 80 27 90 32 PSIG kg cm2G 100 38 SUCTION PRESSURE 70 21 80 27 90 32 PSIG kg cm2G 100 38 TOTAL HEAT OF REJECTION FROM CONDENSER 21 300 BTU h AT 90 F 32 C WT 70 F 21 C CONDENSER VOLUME 226 CU IN SRK 12H Note 1 Pressure data is recorded at 5 min into freezing cycle The data not in bold should be used for reference only 2 We reserve the right to make changes in specifications and design without prior notice 45 2
32. d must be performed by properly trained and EPA certified service personnel 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 Do not use R 404A as a mixture with pressurized air for leak testing NOTICE Always recover the refrigerant and store it in an approved container Do not discharge the refrigerant into the atmosphere Do not leave the system open for longer than 15 min when replacing or servicing parts The Polyol Ester POE oils used in R 404A applications can absorb moisture quickly Therefore it is important to prevent moisture from entering the system when replacing or servicing parts Always install a new drier every time the sealed refrigeration system is opened Do not replace the drier until after all other repair or replacement has been made Install the new drier with the arrow on the drier in the direction of the refrigerant flow When brazing protect the drier by using a wet cloth to prevent the drier from overheating Do not allow the drier to exceed 250 F 121 C 1 Refrigerant Recovery The condensing unit is provided with refrigerant shutoff valves and the icemaker is provided with refrigerant service valves Using proper refrigerant practices recover the refrigerant Recovery via the condensing unit s refrigerant shutoff valves is recommend
33. ed Store the refrigerant in an approved container Do not discharge the refrigerant into the atmosphere 34 2 Brazing A WARNING e 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 Do not use silver alloy or copper alloy containing arsenic 1 Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG Note Because the pipes in the evaporator case are specially coated to resist corrosion itis important to make connections outside the evaporator case when possible If itis necessary to braze inside the evaporator case use sandpaper to remove the coating from the brazing connections before unbrazing the components NOTICE Always install a new drier every time the sealed refrigeration system is opened Do not replace the drier until after all other repair or replacement has been made Install the new drier with the arrow on the drier in the direction of the refrigerant flow When brazing protect the drier by using a wet cloth to prevent the drier from overheating Do not allow the drier to exceed 250 F 121 C 2 Use an electronic leak detector or soap bubbles to check for leaks Add a trace of refrigerant to the system if using a
34. eds to the next cycle if it is closed or calls fora 1 min fill cycle if it is open a Comp FMRs HGVs and LLVs Diagnosis Check that evaporator is warming If not confirm that Comp is energized If not check for 115VAC at CB K1 connector pin 1 or 9 V to a neutral W If 115VAC is not present check wire harness connection If wire harness is loose reconnect If 115VAC is present check for 115VAC at MC coil If 115VAC is present confirm MC contacts are closed If not replace MC If MC contacts are closed check Comp motor windings If FMRs are not energized and MC is energized check FMRs motor windings and fan blades turns freely If Comp is energized and evaporator is not warming check that HGVs are open Check for 115VAC at CB K1 connector pin 2 P to a neutral W If 115VAC is present check coil voltage and continuity of both KMS and SRK HGVs Replace as needed Confirm that both LLVs KMS and SRK are de energized and closed If evaporator is warming place a thermometer on the suction line next to the thermistor Has it warmed to 48 F 9 C or warmer Confirm thermistor status See ILF Thermistor Check If thermistor is in range harvest pump timer should start b PM Diagnosis Confirm WV de energizes LED 4 turns off PM energizes and LED 3 turns on 50 sec before harvest cycle terminates If not confirm S4 dip switch 7 is in the on position Check for 115VAC at CB K1 connector pin 6 O If 115VAC is present and LED
35. els in their correct positions 7 Remove all ice from the dispenser unit ice storage bin Clean the dispenser unit ice storage bin using a neutral cleaner Rinse thoroughly after cleaning 39 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 40 VIII Technical Information A Specification Sheets 1 KMS 1122MLH with SRK 12H AC SUPPLY VOLTAGE APPROXIMATE ICE PRODUCTION PER 24 HR Ib day kg day Reference without marks SHAPE OF ICE ICE PRODUCTION PER CYCLE ELECTRIC 8 WATER CONSUMPTION KMS SRK COMBINED ELECTRIC W kWH 100 Ib WATER gal 24HR gal 100 Ib ENERGY STAR 2 0 EXTERIOR DIMENSIONS WxDxH EXTERIOR FINISH WEIGHT CONNECTIONS ELECTRIC WATER SUPPLY DRAIN REFRIGERATION CUBE CONTROL SYSTEM HARVESTING CONTROL SYSTEM ICE MAKING WATER CONTROL COOLING WATER CONTROL BIN CONTROL SYSTEM COMPRESSOR CONDENSER EVAPORATOR REFRIGERANT CONTROL REFRIGERANT CHARGE DESIGN PRESSURE CONTROL BOARD CIRCUIT PROTECTION REFRIGERANT CIRCUIT PROTECTION LOW WATER PROTECTION ACCESSORIES SUPPLIED REQUIRED OPERATING CONDITIONS 115VAC Supplied by SRK 12H via Factory Supplied Wire Harness Ambient WATER TEMP F Temp F 90 70 1100 499 1066 484 999 453 80 1074 487 1022 464 943 428
36. ervision or instruction concerning use of the appliance by a person responsible for their safety Children should be properly supervised around the appliance Do not climb stand or hang on the appliance or allow children or animals to do so Serious injury could occur or the appliance could be damaged Do not use combustible spray or place volatile or flammable substances near the appliance They might catch fire Keep the area around the appliance clean Dirt dust or insects in the appliance could cause harm to individuals or damage to the appliance A 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 Wire harness routing conduit and disconnect if required 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 the appliance THE ICEMAKER MUST BE GROUNDED Failure to properly ground the icemaker could result in death serious injury or damage to the appliance 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 deat
37. essures are equalized replace HPS If pressures are not equalized reclaim refrigerant and diagnose refrigeration circuit restriction DLT Diagnosis Allow time for DLT to cool and reset If DLT does not reset replace DLT Confirm that the location meets factory requirements e The appliance is not intended for outdoor use Normal operating ambient temperature should be within 45 F to 100 F 7 C to 38 C e The appliance should not be located in a corrosive environment 4 1 Minute 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 energized continue to step 4 If FS is open WV remains energized through additional 1 min fill cycles until water enters the water tank and FS closes low water safety protection during initial start up and at the end of each harvest Diagnosis Check that water enters the water tank If not check that the water supply line shut off valve is open and screens or external filters are clear Confirm that FS is open see II E Float Switch Check and Cleaning If FS is open LED 4 is off and POWER OK LED is on check for 115VAC at CB K1 connector pin 6 O to a neutral W If 115VAC is not present replace CB If LED 4 is on and 115VAC is present check for 115VAC at WV solenoid If 115VAC is present check WV solenoid continuity If the water tank fills but the icemaker fails to start harv
38. est Comp energized check for open FS See ILE Float Switch Check and Cleaning If FS is closed and CB fails to start the harvest cycle after 1 min replace CB 5 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 kO from the thermistor and turns harvest termination over to the harvest timer S4 dip switch 1 amp 2 The harvest timer has settings of 60 90 120 and 180 sec The pump out timer S4 dip switch 3 amp 4 acts in place of the harvest timer during cycles with a pump out S4 dip switch 5 amp 6 WV and X11 relay are energized during harvest for a maximum of 6 min or the length of harvest minus 50 sec whichever is shorter 50 sec before the harvest timer terminates harvest pump timer starts LED 4 turns off WV and X11 relay de energize Harvest Pump Timer LEDs 1 3 and 2 are on Comp FMRs HGVs and X10 relay continue LED 3 turns on and PM energizes for the last 50 sec of harvest S4 dip switch 7 WV and X11 relay de energize NOTICE S4 dip switch 7 must remain in the factory default position of 7 on Otherwise PM will not energize during the last 50 sec of harvest The minimum total time allowed by CB for a complete harvest cycle is 2 min At the end of harvest CB checks the position of FS and proce
39. eties shut down the appliance and have alarms as listed below Manual Reset Alarm Safeties To reset press CB ALARM RESET button with the power supply on WARNING Risk of electric shock Care should be taken not to touch live terminals No of Beeps EE 3 sec Type of Alarm 57 51 Evaporator Temp Check for harvest problem stuck HGVs or relay hot EE gt 127 F 53 C water entering icemaker stuck HM or shorted thermistor Harvest Backup Timer Check for open thermistor HGVs not opening TXVs or harvest gt 20 min for two cycles LLVs leaking by low charge or inefficient Comp in a row Freeze Timer Check for FS stuck closed up WV leaking by HGVs freeze gt specified setting for leaking by PM not pumping TXVs not feeding properly two cycles in a row LLVs not opening low charge HM not bypassing or Timer is factory set using S4 dip inefficient compressor switch 9 amp 10 Automatic Reset Alarm Safeties Automatically reset when voltage returns to acceptable range ELLEN Low Voltage Red POWER OK LED will turn off if voltage protection 92VAC 5 or less operates 7 High Voltage aa 147VAC 5 or more Legend CB control board Comp compressor DV drain valve FMRs fan motors remote FS float switch HGVs hot gas valves HM headmaster LLVs liquid line valves PM pump motor TXVs thermostatic expansion valves WV inlet water valve 27 C Settings and Adjustments NOTICE Dip switches are fa
40. h electric shock serious injury fire or damage to the appliance The remote condensing unit requires an independent power supply of proper capacity See the nameplate for electrical specifications Failure to use an independent power supply of proper capacity can result in a tripped breaker blown fuses damage to existing wiring or component failure This could lead to heat generation or fire THE REMOTE CONDENSING UNIT MUST BE GROUNDED Failure to properly ground the remote condensing unit could result in death serious injury or damage to the appliance NOTICE Follow the instructions in this manual carefully to reduce the risk of costly water damage n areas where water damage is a concern install in a contained area with a floor drain e Install the appliance in a location that stays above freezing Normal operating ambient temperature must be within 45 F to 100 F 7 C to 38 C Do not leave the appliance on during extended periods of non use extended absences or in sub freezing temperatures To properly prepare the appliance for these occasions follow the instructions in VI Preparing the Appliance for Periods of Non Use Do not place objects on top of the appliance The dispenser unit ice storage bin is for ice use only Do not store anything else in the dispenser unit ice storage bin I Construction and Water Refrigeration Circuit Diagrams A Construction 1 Icemaker Hot Gas Valve
41. he tube Secure the bulb with the clamp and holder then insulate it Hot Gas Valves e Replace the strainer if applicable 5 Line Use copper tube of the same diameter and length when replacing valve lines alves Install a new capacitor Pump Motor 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 37 V Maintenance The maintenance schedule below is a guideline More freguent maintenance may be reguired depending on water guality the appliance s environment and local sanitation regulations A 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 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 Place the KMS disconnect if applicable in the OFF position
42. in the KMS and SRK are good 11 3 Power On Turn on the power supply then move the control switch KMS to the ICE position A 5 sec delay occurs CB red POWER OK LED and green BC CLOSED LED turn on Note CB red POWER LED remains on unless the 10 5VAC power supply is interrupted K2 connector CB green BC CLOSED LED remains on unless CB black K4 jumper is loose or removed e Check CB using the steps in II C Control Board Check Power On Diagnosis If CB red POWER OK LED is off confirm BC is closed then check for 10 5VAC at CB K2 connector red wire to red wire If 10 5VAC is not present check for 115VAC at CT then at control switch If 115VAC is not present at the control switch check that the wire harness is securely connected to KMS and SRK Check for 115VAC at terminal block 1 BR to a neutral W If 115VAC is present check BC continuity If 115VAC is not present check that the SRK HPS and DLT are closed If open see HPS or DLT diagnosis below If CB red POWER OK LED is on confirm CB green BC CLOSED LED is on If not confirm that the jumper required on CB red K4 connector is in place and securely attached If CB yellow BC OPEN LED is on with required jumper in place replace CB HPS Diagnosis Check that the condenser coil is not clogged or restricted Check that there are no restrictions in the refrigeration circuit TXV and drier Let refrigeration circuit pressures equalize If HPS does not reset and pr
43. ive and placed in the CIRCULATE position power is supplied to the water pump only This setting is used during cleaning to circulate cleaner for extended periods of time over the outside surface of the evaporator c WASH The appliance utilizes a solenoid operated cleaning valve When the service switch is active and placed in the WASH position power is supplied to the pump motor and cleaning valve This operation is used to circulate cleaner and sanitizer over both the inside and outside of the evaporator 33 IV Refrigeration Circuit and Component Service Information A 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 Place the KMS disconnect if applicable in the OFF position Lockout Tagout to prevent the power supply from being turned back on inadvertently CHOKING HAZARD Ensure all components fasteners and thumbscrews are securely in place after the icemaker is serviced Make sure that none have fallen into the dispenser unit ice storage bin Make sure all food zones in the icemaker and dispenser unit ice storage bin are clean after service A Refrigeration Circuit Service Information A WARNING Repairs requiring the refrigeration circuit to be opene
44. n electronic leak detector and then raise the pressure using nitrogen gas 140 PSIG Do not use R 404A as a mixture with pressurized air for leak testing 3 Evacuation and Recharge R 404A The condensing unit is provided with refrigerant shutoff valves and the icemaker is provided with refrigerant service valves Evacuation and recharge via the condensing unit s refrigerant shutoff valves is recommended 1 Attach a vacuum pump to the system Be sure to connect the charging hoses to both high and low side refrigerant shutoff valves IMPORTANT The vacuum level and vacuum pump may be the same as those for current refrigerants However the rubber hose and gauge manifold to be used for evacuation and refrigerant charge should be exclusively for POE oils 2 Turn on the vacuum pump Open the gauge manifold valves then open the high and low side refrigerant shutoff valves Never allow the oil in the vacuum pump to flow backwards 35 3 Allow the vacuum pump to pull down to a 29 9 Hg vacuum Evacuating period depends on pump capacity 4 Close the low side valve and high side valve on the gauge manifold 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 For the required refrigerant charge see the nameplate on the condensing unit or the rating label inside the icemaker Hoshizaki recommends only virgin
45. nimum 3 8 nominal ID copper water tubing or equivalent d Too cold 5 Control Board a Thermistor connection loose K3 See II C Control Board Check b Defective 6 Thermistor Loose disconnected or defective See ILE Thermistor Check 7 Hot Gas Valves KMS amp SRK a Erratic or closed 8 Inlet Water Valve a Screen or orifice clogged 9 Compressor a Inefficient or off 10 Liquid Line Valves KMS 8 SRK 11 Thermostatic Expansion Valve a Defective C TXV 12 Headmaster Long Freeze Cycle a Scaled up dirty 2 Float Switch Scaled up dirty See II E Float Switch Check Float sticking 7 a Erratic or open 6 Control Board See II C Control Board Check Defective 8 Thermostatic Expansion Valve a Erratic or restricted To Headmaster Ja Defective o o xwe 1 1 1 eo 1 1 1 I J 24 lll Controls and Adjustments A Hoshizaki exclusive control board is employed in the KMS 1122MLH series All models are pretested and factory adjusted e For a control board check procedure see II C Control Board Check NOTICE Fragile handle very carefully The control board contains integrated circuits which are susceptible to failure due to static discharge It is especially important to touch the metal part of the appliance when handling or replacing the control board Do not touch the electronic devi
46. nit fan s not operating 7 Wire Harness a Disconnected or loose connection From SRK to KMS B Fuse KMS Control Bax 9 Control Switch a In SERVICE or OFF position b Bad contacts 115VAC 10 5VAC 11 Bin Control Set too warm e Defective 12 Control Board In alarm See ILC Control Board Check c Defective 13 Inlet Water Valve 21 No Ice Production Possible Cause 14 Float Switch a Float does not move freely See II E Float Switch Check b Defective and 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 16 Hot Gas Valves KMS amp SRK 17 Thermistor Loose disconnected or defective See II F Thermistor Check 18 Pump Motor a Motor winding open b Bearing worn out or locked rotor Defective capacitor 19 Thermostatic Expansion Valve a Bulb loose Operating erratically 20 Liquid Line Valves KMS amp SRK Pup QNM 7 mit 27 Fan Motors Remote Defective 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 1 Evaporator 2 Cube Guides v jojolo o YE
47. occurs after the 11th freeze cycle then every 10th cycle thereafter See the table below Frequency OFF Comp and FMRs remain energized HGVs energize LLVs de energize PM de energizes for 2 sec then PM and DV energize for 10 sec The pump out removes contaminants from the water tank through DV PM Diagnosis In the freeze cycle before pump out see table above disconnect CB black K5 connector FS connector after 5 min of freeze If PM does not energize after 2 sec check that CB LEDs 1 3 and 2 are on If not replace CB If LED 1 3 and 2 are on and PM does not energize check for 115VAC at CB K1 connector pin 5 DBU to a neutral W If LED 3 is on and 115VAC is not present replace CB If 115VAC is present check for 115VAC at X10 relay terminal 2 DBU toa neutral W If 115VAC is not present replace X10 relay If 115VAC is present check for 115VAC at X12 relay terminal 7 DBU to a neutral W If 115VAC is present and PM is not energized check X12 relay coil continuity If open replace X12 relay If 115VAC is present check for 115VAC at X12 relay terminal 3 R to a neutral W If 115VAC is not present confirm 115VAC at X12 relay terminal 5 BR to a neutral If 115VAC is present on terminal 5 BR but not on terminal 3 R replace X12 relay If 115VAC is not present on terminal 5 BR check all BR connections Next check PM capacitor and PM windings DV Diagnosis If water does not pump out check for 115
48. om NOTE To expedite assistance all correspondence communication MUST include the following information Model Number e Serial Number Complete and detailed explanation of the problem 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 Mem 5 Construction and Water Refrigeration Circuit Diagrams 7 A SU ERN RENE a i 7 WA i AA 7 2 Condensing Umit ia 8 B Water Refrigeration Circuit Diagram I 9 II Sequence of Operation and Service Diagnosis 10 A Sequence of Operation Flow Chalrtl VR bn da added pa RC En ninii 10 B EVISTA OSS T 11 C Control Bozu ai 16 D Bin Control Check II 17 E Float Switch Check and Clesnin isi asa teg aa h 17 m Thermistor H R u a 20 EN oscar a a 21 III Controls and A US menis oc eee al na R a m a alaya 25 A Control Board Eoyoul R e 26 B L
49. r 2nd freeze cycle Every 5 cycles After 6th freeze cycle O Every 10 cycles After 11th freeze cycle 5 Harvest Pump Timer S4 dip switch 7 NOTICE Ne FF Every cle N N Factory set for proper operation Do not adjust Adjustment outside of the factory default setting may result in damage to the appliance When S4 dip switch 7 is in the on position and harvest begins X11 and X10 relays energize A latching circuit is created through the X11 and X10 relays This prevents the drain valve from energizing For further details see VIII C Wiring Diagrams 50 sec before harvest termination LED 4 turns off inlet water valve and X11 relay de energize X10 relay remains energized through the latching circuit Next LED 3 turns on and control board K1 connector pin 5 DBU wire energizes and the pump motor energizes for the last 50 sec of harvest The inlet water valve and X11 relay are energized during harvest for a maximum of 6 min or the length of harvest minus 50 sec whichever is shorter S4 Dip Switch Setting Pump Motor Time sec a a j 6 Factory Use S4 dip switch 8 Factory set for proper operation NOTICE Do not adjust This must be left in the factory default position 30 7 Freeze Timer S4 dip switch 9 amp 10 NOTICE Adjust to proper specification or the icemaker may not operate correctly The freeze timer setting determines the maximum allowed freeze time to prevent possi
50. refills during the freeze cycle The KMS 1122MLH does not refill Do not adjust S5 Dip Switch Setting No of Refills 0 Refills Note When refill set gt 0 water valve is off during pump out even if S4 dip switch 3 amp 4 are set to 3 off and 4 on See III C 3 Pump Out Timer S4 dip switch 3 amp 4 32 D Control Switch and Service Switch 2 switches are used to control the operation of the appliance These switches are referred to as the control switch and service switch They are located on the KMS control box 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 and water pump The service switch has three positions DRAIN CIRCULATE and WASH Note 1 When the service switch is active control switch in the SERVICE position power is supplied to the water pump in all three positions 2 When the control switch is in the OFF or ICE position the service switch is de activated In this state it can be left in any position a DRAIN The appliance utilizes a pump out drain system When the control switch is in the SERVICE position and the service switch is placed in the DRAIN position power is supplied to the water pump and drain valve b CIRCULATE When the service switch is act
51. refrigerant or reclaimed refrigerant which meets ARI Standard 700 latest edition be used 6 A liquid charge is required when charging an R 404A system to prevent fractionation Place the service cylinder on the scales if the service cylinder is not equipped with a dip tube invert the service cylinder then place it on the scales Open the high side valve on the gauge manifold 7 Allow the system to charge with liquid until the proper charge weight is met 8 If necessary add any remaining charge to the system through the low side NOTICE To prevent compressor damage use a throttling valve or liquid dispensing device to add the remaining liquid charge through the low side refrigerant shutoff valve with the icemaker running 9 Close the high and low side refrigerant shutoff valves Close the high and low side gauge manifold valves then disconnect the gauge manifold hoses 10 Cap the refrigerant shutoff valves to prevent a possible leak 36 B Component Service Information NOTICE When replacing a component listed below see the notes to help ensure proper operation Component Nets Compressor 1 Phase SRK Install a new start capacitor run capacitor and start relay 3 Phase SRK Install a new magnetic contactor Thermostatic Attach the thermostatic expansion valve bulb to the suction line in the same location as Expansion the previous bulb Valves The bulb should be between the 10 and 2 o clock positions on t
52. shock Use extreme caution and exercise safe electrical practices e Risk of electric shock Control switch KMS in OFF position does not de energize all loads Moving parts e g fan blade can crush and cut Keep hands clear CHOKING HAZARD Ensure all components fasteners and thumbscrews are securely in place after the appliance is serviced Make sure that none have fallen into the dispenser unit ice storage bin Make sure all food zones in the icemaker and dispenser unit ice storage bin are clean after service Diagnostic Procedure The diagnostic procedure is a sequence check that allows you to diagnose the electrical system and components Before proceeding check for correct installation proper voltage per nameplate and adequate water supply Note e When checking high voltage 115VAC always choose a neutral W to establish a good neutral connection e On 3 phase models the neutral W is provided through MT To confirm a good neutral W check for 60VAC from neutral W to ground GND If 60VAC is present neutral W is good If 6OVAC is not present check 208 230VAC main power supply to MT If 208 230VAC is present check MT continuity When checking voltage from the CB K1 connector 10 pin connector pull CB K1 connector out slightly to allow room for multimeter test leads contact 1 Turn off the power supply then access the control box Clear any ice from BC 2 Check that the 115VAC 10A fuses
53. tch 3 amp 4 NOTICE Factory set for proper operation Do not adjust S4 dip switch 3 amp 4 to 3 off and 4 on Otherwise drain valve does not energize in pump out The 1st pump out occurs after the 11th freeze cycle then every 10th cycle thereafter When a pump out is called for the pump motor stops for 2 sec then the X12 drain valve relay energizes allowing the pump motor and drain valve to energize Water is removed from the bottom of the water tank and sent down the drain The pump out drains the water tank for the time determined by the pump out timer The pump out timer also acts in place of the harvest timer during cycles with a pump out The pump out timer is factory set and generally no adjustment is required The pump out timer can be set for a 10 or 20 sec pump out S4 Dip Switch Setting Inlet Water Valve 10 150 ce 8 Nos T ON N T1 Time to drain the water tank T2 Harvest timer at pump out O 29 4 Pump Out Frequency Control S4 dip switch 5 amp 6 The pump out frequency control is factory adjusted to drain the water tank every 10 cycles and generally no adjustment is required However where water quality is bad and the appliance needs a more frequent pump out the pump out frequency can be adjusted as shown in the table below Timing of the first pump out is dependent on S4 dip switch 5 amp 6 settings See the table below 4 Dip Switch Setting Pump Out Frequency Every cycle Afte
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55. ve the float 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 10 11 12 13 14 Turn on the power supply to start the automatic icemaking process Reassemble FS assembly and replace it and FS stop in their correct positions Replace the side insulation left side top and apron panels in their correct positions Move the control svvitch to the ICE position Replace the front panel in its correct position Legend CB control board FS float switch Float Switch m i Stop lA L b ha Float Switch b Housing jd Retainer Rod F 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 6 Disconnect the thermistor connector from CB white K3 connector and check resistance between thermistor leads Normal range is 4 7 to 6 2 kQ If outside the normal range replace the thermistor See V B Component Information If within the normal range continue to
56. water tank full FS should be closed If FS is closed and the appliance will not switch from the 1 min fill cycle to the initial harvest cycle replace CB 17 If open confirm that the water tank is full If the water tank is not full check the water supply water filters and inlet water valve If the water tank is full follow the steps in ILE 2 Float Switch Cleaning After cleaning FS check it again Replace if necessary 18 Reconnect FS connector to CB black K5 connector then replace the control box cover in its correct position 19 Move the control switch to the ICE position 20 Replace the front panel in its correct position 21 Turn on the power supply to start the automatic icemaking process Legend CB control board FS float switch 18 2 Float Switch Cleaning Depending on local water conditions scale may build up on FS Scale can cause FS to stick In this case FS should be cleaned 1 Turn off the power supply 2 Remove the front panel 3 Place the control switch in the SERVICE position Then place the service switch in the DRAIN position 4 Replace the front panel in its correct position then turn on the power supply for 2 min 5 Turn off the power supply 6 Remove the front apron top left side panels and side insulation then move the control switch to the OFF position 7 Remove FS assembly and FS stop See Fig 2 8 Remove the retainer rod from the bottom of FS assembly then remo

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