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Hoshizaki KM-901MRH/3 User's Manual

1. ayka 32 b Harvest Timer S4 dip switch 1 32 c Pulmp Out Timer 54 dip switch 3 amp 4 33 d Pump Out Frequency Control S4 dip switch 5 amp 6 33 e Bin Control Selector Harvest Pump Timer S4 dip switch 7 34 f Factory Use S4 dip SWiItehh 8 a aaa en Paca apta qnaa Ea aco GO ccn 34 9 Freeze Timer S4 dip switch 9 amp 10 35 h Float Switch Control S5 dip switch 1 G Control Board 35 i Refill Counter S5 dip switch 2 through 5 G Control Board 35 D BIR CORO ECTETUR Ncc 36 1 Thermostatic Bin Control Auxiliary Code T 0 U O 36 2 Mechanical Bin Control Auxiliary Code U 1 and Later 36 E Float uuu uuu L uuu 36 E 1116111115101 ecc e 36 G Go trel 1 11 PRIN 36 ii Technical 1110111781601 RE TT 37 A Water Circuit and Refrigeration Circuit 37 To KM 901MAH alr Cooled arant vx tv tubas Run ba Dala a 37 2 KM 901MWH 316 0001600 38 3 KM 901MRH 3 remote air cooled 39 B Wiring DISG Ia ffS u u uu au cu
2. o Disconnect the flare connections of the valve 10 11 12 13 14 Remove the screws and the valve from the bracket Install the new valve Remove the drier then place the new drier in position Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG 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 15 Evacuate the system and charge it with refrigerant See the nameplate for the required refrigerant charge 16 Connect the flare connections 17 Close the drain valve s Open the condenser water supply line shut off valve If connected to a closed loop water supply also open the condenser return outlet shut off valve 77 18 Check for water leaks 19 Replace the panels in their correct positions 20 Turn on the power supply J Adjustment of Water Regulating Valve water cooled model The water regulating valve also called water regulator is factory set and generally no adjustment is required However when necessary adjust the water regulator using the following procedures 1 Prepare a thermometer to check the condenser drain temperature Attach a pressure gauge to the high side line of the system Adjustment Screw
3. Power LED level indicated by last lights when 2 digits on label power is supplied to the BLACK K5 Connector 5 P N 2A1410 01 35 control board 027 B Float Switch Relay LEDs 4 m o o Part Number indicate which m Bs listed below 2 1 le Pins 1 through 10 LED 2 X2 Relay Hot Gas Valve HGV Fan Motor FM FM off d when LED on Liquid Line Valve LLV LED 3 X3 Relay TE e H 03 RE 1 9 Magnetic Contactor 2 Hot Gas Valve HGV x mo o 55 43 Fan Motor FM izi Liquid Line Valve LLV 4 Pump Motor icemaking 5 Pump Motor pump out 6 Inlet Water Valve WV Pump Motor PM on at pump out only 2 1 H 7 10 17 Povver LED 4 X4 Relay m ogra RD 2 x CN 8 Open Inlet Water Valve WV a RG 2 8 le 1 C 9 D16 o o LED 1 X1 Relay 25 Switch for C control board Compressor Comp O 2 15 and ALPINE control board Fan Motor Remote 1 7 o Re x service control board only FMR K2 Connector Transformer E Control Board Part Number 2A1410 01 factory 2A1410 02 service 27 b G Control Board Auxiliary Code U 1 and Later G Control Bo
4. Shaft Float Switch Housing Float Retainer Rod Rubber Boot 5 and Hose Fig 3 58 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 4 Remove the thermistor See V L Removal and Replacement of Thermistor 5 Immerse the thermistor sensor portion in a glass containing ice and water for 2 or 3 minutes 6 Remove the white thermistor connector from the control board WHITE K3 connector and check the resistance between thermistor leads Normal reading is within 4 7 to 6 2 kQ If outside the normal reading replace the thermistor If inside the normal reading continue to the next step 7 Replace the thermistor in its correct position See V L Removal and Replacement of Thermistor 8 Reconnect the white thermistor connector to the control board WHITE K3 connector 9 Replace the control box cover in its correct position then turn on the power supply Move the control switch to the ICE position 3 Remove the control box cover Once the harvest cycle starts begin timing the harvest cycle The harvest timer should expire and terminate the harvest cycle within 2 to 3 minutes If the harvest timer does not expire and terminate the harvest cycle the harvest timer is bad and the control board should be replaced See V P Removal and Re
5. 76 I Removal and Replacement of Water Regulating Valve water cooled model 7 J Adjustment of Water Regulating Valve water cooled model 78 K Removal and Replacement of Headmaster Condensing Pressure Regulator C P R remote air cooled model 78 L Removal and Replacement of Thermistor 79 M Removal and Replacement of Fan Motor air cooled and remote air cooled models 80 N Removal and Replacement of Inlet Water Valve 80 O Removal and Replacement of Pump Motor R 81 P Removal and Replacement of Control 82 MI Cleaning and MaI tenance 83 A Cleaning and Sanitizing Instructions 83 1 Cleaning 5 84 2 Sanitizing Procedure Following Cleaning Procedure 85 Maintenance b yasamal papa 86 C Preparing ihe Icemaker Tor Long 101386 86 Important Safety Information Throughout this manual notices appear to bring your attention to situations which could res
6. on 8 lt olo HW A 7871 11 0 10111117 7 1 d 5 lo lo erp VN V OND vog YOSHI 30 7081107 NIG HINO ASHE 4 yaln HLIM IMIM 71 40 b KM 901MRH remote air cooled 0 Auxiliary Code T 0 U Thermostatic Bin Control YOUMS oJnssaJg uBiH 7 78 03 124 17 LINN 1393007 51 ur i A 3170 10 80 P Me o SSH L y AJ r 190 ND zal m x ki EN NR l 20 4 JAWA 4 JATA AWA wid YQ 00 NI 9 81 s MS 0 4g 7 d un 300 1010 WIM x TEE 16 19 6 e T ik n to A Zo CHI i 1 fE asr WIS 1 511 MS Nn NT YOLIWINOD 113884 dn LVS to yg ud M 8 m N 1 IN QNO 9803 NI 5 Yu S 403 7101031 HLIM HIM c KM 901MRH3 remote air cooled Thermostatic Bin Control Auxiliary Code T 0 U 0 0154 Lc Zc 5154 7 U91IA S 9415859414 UBIH 111111 35V 0 LINN 01110101 4 NOTA A 1110 7 1118 80 ld 4 MU9 19 JONVYO r l 111
7. Do not make any alterations to the unit Alterations could result in electric shock injury fire or damage to the unit I Specifications A Icemaker 1a KM 901MAH air cooled Auxiliary Code T 0 U 0 AC SUPPLY VOLTAGE AMPERAGE MINIMUM CIRCUIT AMPACITY MAXIMUM FUSE SIZE APPROXIMATE ICE PRODUCTION PER 24 HR Ibs day kg day Reference without marks SHAPE OF ICE ICE PRODUCTION PER CYCLE APPROXIMATE STORAGE CAPACITY ELECTRIC amp WATER CONSUMPTION ELECTRIC W KVVH 100 lbs WATER gal 24HR gal 100 Ibs EXTERIOR DIMENSIONS WxDxH EXTERIOR FINISH WEIGHT CONNECTIONS ELECTRIC WATER SUPPLY DRAIN 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 P C BOARD CIRCUIT PROTECTION COMPRESSOR PROTECTION REFRIGERANT CIRCUIT PROTECTION LOW WATER PROTECTION ACCESSORIES SUPPLIED REQUIRED OPERATING CONDITIONS 208 230 60 1 3 wire with netrual for 115V 11 4 5 Min Freeze AT 104 F WT 80 F 20A 20A Ambient WATER TEMP F TempCF 500 701 90 70 874 396 832 378 785 356 Crescent Cube 13 6 Ibs 6 2 kg 720pcs N A 90 70 F 70 50 F 1710 5 6 1600 4 4 143 19 6 240 27 5 30 x 27 3 8 x 37 7 16 762 x 695 x 950 mm Stainless Steel Galvanized Steel Rear Net 196 Ibs 89 kg Shipping 256 Ibs
8. 1 Remove the water from the icemaker water supply line 1 Turn off the power supply then remove the front panel 2 Move the control switch on the control box to the OFF position 3 Close the icemaker water supply line shut off valve then open the icemaker water supply line drain valve 4 Allow the line to drain by gravity 86 5 Attach a compressed air or carbon dioxide supply to the icemaker water supply line drain valve 6 Move the control switch to the ICE position 7 Replace the front panel in its correct position then turn on the power supply 8 Blow the icemaker water supply line out using the compressed air or carbon dioxide supply 9 Close the icemaker water supply line drain valve 2 Drain the water tank 1 Turn off the power supply then remove the front panel 2 Move the control switch to the OFF position 3 Remove the base cover then disconnect one end of the pump tubing to drain the water tank See Fig 8 After the water tank has drained reconnect the pump tubing 4 Replace the base cover and the front panel in their correct positions 5 Remove all ice from the storage bin Clean the storage bin liner using a neutral cleaner Rinse thoroughly after cleaning 3 On water cooled model remove the water from the water cooled condenser 1 Make sure the power supply is off then remove the front panel and right side panel 2 Close the condenser water supply line shut off valve If connected t
9. 2 Five minutes after a freeze cycle starts confirm that the thermometer reads 104 F to 115 F 40 C to 46 C If it does not rotate the adjustment screw by using a flat blade screwdriver until the temperature Top View is in the proper range See Fig 4 Next check that the reference pressure is in the range indicated in the Head Pressure table in the Performance Data section If it is not Fig 4 in the proper range verify the refrigerant charge CW Higher CCW Lower 3 Check that the condenser drain temperature is stable K Removal and Replacement of Headmaster Condensing Pressure Regulator C P R remote air cooled model CAUTION 1 Always install a new drier every time the sealed refrigeration system is opened 2 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 3 When brazing protect the headmaster and drier by using wet cloths to prevent the headmaster and drier from overheating Do not allow the headmaster or drier to exceed 250 F 121 C 1 Turn off the power supply 2 Remove the panels from the remote condenser unit 3 Recover the refrigerant and store it in an approved container 4 Before heating break off the stub on the dome to release the dome charge 5 Disconnect the headmaster 6 Place the new headmaster in position 7 Remove the drier
10. Always replace the whole control board assembly if it goes bad Do not short out power supply to test for voltage 1 Turn off the power supply 2 Remove the front panel and the control box cover 3 Disconnect the control board connectors from the control board 4 Remove the control board 5 Adjust the dip switches on the new control board to the factory default settings See Il C 3 a Default Dip Switch Settings CAUTION Do not adjust S4 dip switch 7 out of the factory default position on this model This dip switch must be left in the factory default position or this unit will not operate correctly 6 Install the new control board taking care not to damage it 7 Connect the control board connectors to the new control board 8 9 Turn on the power supply Replace the control box cover and front panel in their correct positions 82 VI Cleaning and Maintenance A WARNING CHOKING HAZARD Ensure all components fasteners and thumbscrews are securely in place after any cleaning or maintenance is done to the unit Make sure that none have fallen into the 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 A WARNING TO prevent injury to individuals and damage to the icemaker do not use ammonia type cleaners Carefu
11. Make sure all food zones in the icemaker and storage bin are clean after the unit is serviced For cleaning procedures see VI Cleaning and Maintenance A Service for Refrigerant Lines A WARNING Repairs requiring the refrigeration circuit to be opened must be performed by properly trained and EPA certified service personnel Always recover the refrigerant and store it in an approved container Do not discharge the refrigerant into the atmosphere 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 CAUTION Do not leave the system open for longer than 15 minutes when replacing or servicing parts The Polyol Ester POE oils used in R 404A units 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 Refr
12. l 01 60 35 JOU 92994 9 41 2994 WUNWIXEN e 48 0 8 sdeis 401168 001354 g 9 2994 WNWIUIN e S AHEU jo 16 91 y 10 uiu 9 v AM e 9 24 1no duind rI l 929944 l 4 1 Z 114 lnullN I L 5 81949 ee HHINL06 INM HAMIN 106 VVM HVINLEO6 INM HEU 014 pJeog 104002 J Code U 1 and Later iary Auxili b G Control Board 1312 19 UI AM 100w duind Nd 033009 ulq jeoiueuoeur 3glN 586 JOU AOH uonisod 321 94 peoeld si 765 JOJJUOD BY UBYM JOU pun y 5 010 10000372 eie 6012111025 pue 61 2312 Jaye A BA 60 0 5312 eui Ajquiasse 81819 10je1ode e au episui eui pue 30151 eui ujog MO Jezniues pue 30212 eui uedo A PA 60 0 2312 v UHM Ajquiesse YOUMS 12011 5 101001 4 055 00 602 0002 yeld 6015 008 y JO episino eui 0 211465 pue 302512 BU pasoo eA eA Burueejo eui UHM 1010 0 duund v 2 7 6 SI Jamod uonisod HSVM 94 U ueuM eui 8012125 pue ueuM pesn 51 YO IMS 0 1400 BY uo uorisod HSVM uonisod 8 9 U S 51 8 104002 ay 921649 sjueuoduio 9
13. 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 12 4a KM 901MRH3 remote air cooled Auxiliary Code T 0 U 0 AC SUPPLY VOLTAGE AMPERAGE MINIMUM CIRCUIT AMPACITY MAXIMUM FUSE SIZE APPROXIMATE ICE PRODUCTION PER 24 HR Ibs day kg day Reference without marks SHAPE OF ICE ICE PRODUCTION PER CYCLE APPROXIMATE STORAGE CAPACITY ELECTRIC amp WATER CONSUMPTION ELECTRIC W kWH 100 lbs WATER gal 24HR gal 100 Ibs EXTERIOR DIMENSIONS WxDxH EXTERIOR FINISH WEIGHT CONNECTIONS ELECTRIC WATER SUPPLY DRAIN 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 P C BOARD CIRCUIT PROTECTION COMPRESSOR PROTECTION REFRIGERANT CIRCUIT PROTECTION LOW WATER PROTECTION ACCESSORIES SUPPLIED REQUIRED OPERATING CONDITIONS 208 230 60 3 7 0A 5 Min Freeze AT 104 F WT 80 F 20A 9 899 408 874 397 817 371 880 399 842 382 772 350 874 397 815 370 749 340 855 388 800 363 689 313 Crescent Cube 14 2 Ibs 6 4 kg 720pcs N A 90 70 F 70 50 F 1830 5 4 1670 4 5 147 18 0 254 28 2 30 x 27 3 8 x 37 7 16 762 x 695 x 950 mm Stainless Steel Galvanized Steel Rear Net 198 Ibs 90
14. FPT Float Switch Hot Gas and Water Thermistor and Timer Timer Controlled Overflow Pipe Pressure Regulator Thermostat Hermetic Model CS12K6E PFV 237 Water cooled Tube in tube type Vertical type Stainless Steel and Copper Thermostatic Expansion Valve R404A 1 Ib 15 4 oz 890g High 427PSIG Low 230PSIG High Voltage Cut out Internal Auto reset Overload Protector Internal Auto reset High Pressure Control Switch Float Switch N A Ice Storage Bin VOLTAGE RANGE AMBIENT TEMP WATER SUPPLY TEMP WATER SUPPLY PRESSURE 187 253 V 45 100 F 45 90 F 10 113 PSIG Note We reserve the right to make changes in specifications and design without prior notice 2b KM 901MWH water cooled Auxiliary Code U 1 and Later AC SUPPLY VOLTAGE AMPERAGE MINIMUM CIRCUIT AMPACITY MAXIMUM FUSE SIZE APPROXIMATE ICE PRODUCTION PER 24 HR Ibs day kg day Reference without marks SHAPE OF ICE ICE PRODUCTION PER CYCLE APPROXIMATE STORAGE CAPACITY ELECTRIC amp WATER CONSUMPTION ELECTRIC W kWH 100 Ibs WATER gal 24HR gal 100 Ibs WATER COOLED CONDENSER gal 24HR gal 100 Ibs EXTERIOR DIMENSIONS WxDxH EXTERIOR FINISH WEIGHT CONNECTIONS ELECTRIC WATER SUPPLY DRAIN 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 P C BOA
15. Pump Motor pump ouk harvest if applicable LED 4 X4 Relay o Is 6 Inlet Water Valve WV Inlet Water Valve WV 7 10 Component Power o o Supply 3 sa vx 8 Open LED 1 X1 Relay in ate Compressor Com P ie Ah m Switch for C control board Fan Motor Remote 00 ger Oo and ALPINE control board FMR O 8 28 9 x service control board only K2 Connector Transformer G Control Board Part Number 2A3792 01 28 2 Features a Maximum Water Supply Period 6 minutes E control board The inlet water valve is open during harvest for 6 minutes or the length of harvest whichever is shorter G control board The inlet water valve is open during harvest for 6 minutes or the length of harvest minus 0 or 50 seconds harvest pump timer S4 dip switch 7 whichever is shorter For details see II C 3 e Bin Control Selector Harvest Pump Timer S4 dip switch 7 b Harvest Backup Timer and Freeze Timer The harvest backup timer shuts down the icemaker if for two cycles in a row the harvest cycle takes more than 20 minutes to complete The control board signals this problem using 2 beeps every 3 seconds The freeze timer shuts down the icemaker if for two cycles in a row the freeze cycle takes longer than the time specified to complete The control board signals this problem using 3 beeps every 3 seconds The freeze timer is factory set using S4 dip
16. Replace b Mechanical Bin Control 1 Movement restricted 1 Check and free 2 Check and reconnect 3 Defective 3 See IV C 2 Mechanical Bin Control Check and Cleaning c Control Board G 1 Defective 1 See IV B Control Board control board with Check mechanical bin control 2 Abnormal noise a Pump Motor 1 Bearings worn out 1 Replace b Fan Motor except 1 Bearings worn out 1 Replace water cooled model 2 Fan blade deformed 2 Replace 3 Fan blade does not 3 Replace move freely c Compressor 1 Bearings worn out or 11 Replace cylinder valve broken 2 Mounting pad out of 12 Reinstall position d Refrigerant Lines 1 Rub or touch other 1 Reposition lines or surfaces 3 Ice in storage bin a Drain Line s 1 Plugged often melts b Icemaker and Bin 1 Drains not run 1 Separate the drain lines separately c Cube Guide 1 Out of position 1 Place in position Circulated water falls into bin 67 V Removal and Replacement of Components A WARNING This unit should be diagnosed and repaired only by qualified service personnel to reduce the risk of death electric shock serious injury or fire Move the control switch to the OFF position and turn off the power supply before servicing CHOKING HAZARD Ensure all components fasteners and thumbscrews are securely in place after the unit is serviced Make sure that none have fallen into the storage bin
17. a d 7 1 KM 901MAHI air cooled La a ap a E aa 7 2 KM 901MWH water cooled 16 3 1 remote air cooled 19 A R E 20 1 Sequence Cycles and Shutdown 20 a E Control Board Auxiliary Code 1 0 0 20 G Control Board Auxiliary Code U 1 and Later 21 2 5601061066 Flow CHARE TT TTE 24 a E Control Board Auxiliary Code 1 0 U 0 24 G Control Board Auxiliary Code U 1 and Later 25 C Control Boalda uu u u a m 26 1 Control Board Layo t RET Hm 27 2 1 0 A 29 a Maximum Water Supply Period 6 minutes 29 b Harvest Backup Timer and Freeze Timer 29 c High Temperature Safety b sbsdi 29 d Low Walter Safely sisal asas Ba Ra 29 e High Voltage and Low Voltage 101 0101 29 f LED Lights and Audible Alarm 65 30 a Default Dip Switch Settings
18. then place the new drier in position 78 8 Braze all fittings with nitrogen gas flowing at a pressure of 3 to 4 PSIG 9 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 10 Evacuate the system and charge it with refrigerant See the rating label inside the icemaker for the required refrigerant charge 11 Replace the panels in their correct positions 12 Turn on the power supply L Removal and Replacement of Thermistor This section covers removal and replacement of the thermistor For a thermistor check procedure see IV E Thermistor Check CAUTION The thermistor is fragile handle very carefully Always use the recommended sealant high thermal conductive type Model KE4560RTV manufactured by SHINETSU SILICONE Part Code 60Y000 11 or Part Code 4A0683 01 or equivalent Always use the recommended foam insulation non absorbent type or equivalent Do not shorten or cut the thermistor leads 1 Turn off the power supply 2 Remove the panels 3 Remove the control box cover 4 Disconnect the white thermistor connector from the control board WHITE K3 connector 5 Remove the plastic cable ties foam insulation thermistor holder and thermistor See Fig 5 Thermistor
19. 0 Factory set for proper operation Do not adjust When set to the on position on a unit with a thermostatic bin control a 5 beep alarm sounds open circuit and the unit does not operate E Control Board 4 Dip Switch Settin p ing Bin Control 2 Harvest Pump Timer G Control Board Auxiliary Code U 1 and Later Factory set for proper operation Do not adjust Depending on the harvest pump timer setting the pump motor energizes and runs the last 0 or 50 seconds of harvest The water valve is energized during harvest for a maximum of 6 minutes or the length of harvest minus 0 or 50 seconds determined by the harvest pump timer setting whichever is shorter CAUTION Do not adjust 54 dip switch 7 out of the factory default position on this model This dip switch must be left in the factory default position or this unit will not operate correctly G Control Board 4 Dip Switch Setting Pump Motor Time seconds N or f Factory Use S4 dip switch 8 Factory set for proper operation Do not adjust This must be left in the factory default position 34 g Freeze Timer S4 dip switch 9 amp 10 CAUTION Adjust to proper specification or the unit may not operate correctly The freeze timer setting determines the maximum allowed freeze time to prevent possible freeze up issues Upon termination of the freeze timer the control board initiates the harvest cycle After 2 consecutive freeze timer terminations
20. 55 a Mechanical Bin Control Check 55 b Mechanical Bin Control Cleaning 56 D Float Switch Check and Cleaning 57 57 58 Float SWIC CIAO eas 2 E Thermistor go sass asas ee 59 F 10130105116 CS RR 60 V Removal and Replacement of Components a 68 A Service for Refrigerant Lines 68 1 Retigerant FE COV ONY RENTE 68 2 BraZifi9 MR 69 3 Evacuation and Recharge R 404A YA s RA 69 B Removal and Replacement of 350 70 C Removal and Replacement of Expansion Valve sss 71 D Removal and Replacement of Hot Gas Valve or Liquid Line Valve 72 E Removal and Replacement of Evaporator 73 F Removal and Replacement of Air Cooled Condenser 74 G Removal and Replacement of VVater Cooled Condenser 75 H Removal and Replacement of Remote Air Cooled Condenser
21. 8 OD Tube Float Switch Hot Gas and Water Thermistor and Timer Timer Controlled Overflow Pipe N A Thermostat Hermetic Model CS12K6E PFV 279 Air Cooled Remote Condenser Unit URC 9F Vertical type Stainless Steel and Copper Thermostatic Expansion Valve Condensing Pressure Regulator on URC 9F R404A 9 lbs 4 oz 42000 Icemaker 5 Ibs 5 oz Cond Unit 3 Ibs 15 oz High 467PSIG Low 230PSIG High Voltage Cut out Internal Auto reset Overload Protector Internal Auto reset High Pressure Control Switch Float Switch N A Ice Storage Bin Remote Condenser Unit VOLTAGE RANGE 187 253 V 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 11 3b KM 901MRH remote air cooled Auxiliary Code U 1 and Later AC SUPPLY VOLTAGE AMPERAGE MINIMUM CIRCUIT AMPACITY MAXIMUM FUSE SIZE APPROXIMATE ICE PRODUCTION PER 24 HR Ibs day kg day Reference without marks SHAPE OF ICE ICE PRODUCTION PER CYCLE APPROXIMATE STORAGE CAPACITY ELECTRIC amp WATER CONSUMPTION ELECTRIC W KVVH 100 lbs WATER gal 24HR gal 100 Ibs EXTERIOR DIMENSIONS WxDxH EXTERIOR FINISH WEIGHT CONNECTIONS ELECTRIC WATER SUPPLY DRAIN CUBE CONTROL SYSTEM HARVESTING CONTROL SYSTEM ICE MAKING WATER CONTROL COOLING WATER CONTROL BIN CONTROL SYSTEM COMPRESSOR CONDENSER EVAPORATOR REFRIGE
22. 80 27 90 32 bs day kg day 100 38 APPROXIMATE ELECTRIC 70 21 CONSUMPTION 80 27 90 32 vvatts 100 38 APPROXIMATE VVATER 70 21 CONSUMPTION PER 24 HR 80 27 90 32 gal day 7 100 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 em G 100 38 TOTAL HEAT OF REJECTION FROM CONDENSER 15 400 BTU h AT 90 F 32 C WT 70 F 21 C Note 1 Pressure data is recorded at 5 minutes into freeze 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 2 KM 901MWH water cooled APPROXIMATE ICE AMBIENT TEMP PRETU 70 21 80 27 90 32 Ibs 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 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 6 100 38 SUCTION PRESSURE 70 21 80 27 90 32 PSIG kg cm G 100 38 TOTAL HEAT OF REJECTION FROM CONDENSER 13 500 BTU h AT 90 F 32 C WT 70 F 21 C TOTAL HEAT OF REJECTION FROM COMPRESSOR 2 100 BTU h AT 90 F 32 C WT 70 F 21 C WATER FLOW FOR CONDENSER 100 gal h AT 100 F 38 C WT
23. IMPORTANT This manual should be read carefully before the icemaker is serviced or maintenance operations are performed Only qualified service technicians should install service and maintain the icemaker Read the warnings contained in this booklet carefully as they give important information regarding safety Please retain this booklet for any further reference that may be necessary CONTENTS Important Safety htorm tioli 9 6 Specifications a aa 7 160612 ea aa 7 18 KM 901MAH air cooled Auxiliary Code U 0 7 1b KM 901MAH air cooled Auxiliary Code U 1 and Later eeen 8 2a KM 901MWH water cooled Auxiliary Code 1 0 U 0 9 2b KM 901MWH water cooled Auxiliary Code U 1 and Later 10 KM 901MRH remote air cooled Auxiliary Code T 0 U 0O 11 3b KM 901MRH remote air cooled Auxiliary Code U 1 and Later T2 4a KM 901MRH3 remote air cooled Auxiliary Code T 0 U 0 13 4b KM 901MRH remote air cooled Auxiliary Code U 1 and Later 14 B Gondenser DmNitu uuu m 15 URSI erc c n 15 Il General informatio NN o 7 A CONSrUCHO Meee erene En
24. NIB ud Le 01 NOG ors 0 5 0890 5 804 11102 HLIM 7 0 eye ud 34M lt P x c KM 901MRH3 remote air cooled Auxiliary Code U 1 and Later Mechanical Bin Control 5186 155 25 40 0154 777 yams inss id n 35 NED LINN 82313000 31048 1211011 x M nn M 0113 4 nori 604 22920 0 130 17 1 dino 499 0 8 41 1118 1 8 q 00000 Wid d 1 y Ave 9 03 4 Al nim 1 4 31 4 MS Nou M 10 E o 1 p To BN TT TT AM n an 1 i 97118 NH HIM i Ws yg z mi 7 Tun 8 eS 1 USWYOASNVYL 9 M 96 7 9 c qo NS dyl 6 1 3L 06 to 9 Zo Lo 0 O dil i MS 170 i ug E lo X y Xi 81118 111388 HDIIMS to 081N0 Di NT m wa Lo 4 01 7 1 N 900 019 851 3804 oo YFTTOYINO 7 45 C Performance Data 1 KM 901MAH air cooled APPROXIMATE ICE AMBIENT TEMP PRODUCTION PER 24 HR ere 70 21
25. Remove the front panel then remove the Water Tank insulation panel by lifting up the panel slightly and pulling it towards you 5 Remove the base cover then disconnect one end of the pump tubing to drain the water tank See Fig 7 After the water tank has drained reconnect the pump tubing 6 In bad or severe water conditions clean the float switch assembly as described below Otherwise continue to step 7 a Disconnect the vent tube and the flush tube from the top of the float switch then remove the float switch assembly Remove the rubber boot from the bottom of the assembly b 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 c Wipe down the float switch assembly s 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 d Reassemble the float switch assembly and replace it and the rubber boot in their correct positions Reconnect the vent tube and the flush tube Base Cover Fi g 7 7 Pour the cleaning solution into the water tank 8 Fully open the cleaning valve on the left side wall of the machine compartment 9 Move the control switch on the control box to the WASH position 0 Replace the insulation panel and the front panel in their correct positions Turn on the
26. Valve Condenser Spray Tubes Inlet Water Valve EN s m 9 o lt Water Supply li High Pressure Switch Strainer Evaporator Drier Hot Gas Valve Cleaning Valve Check Valves Access Valve Refrigeration Circuit Check Valve Mmm Water Circuit 38 3 KM 901MRH 3 remote air cooled Condenser Headmaster C P R Spray Tubes Inlet Water Valve Water Supply jio 4 High Pressure Receiver Tank Switch Strainer Evaporator Hot Gas Valve Thermistor Liquid Line Cleaning Valve Valve Check Valves fi Refrigeration Circuit Check Valve uu Water Circuit 39 Thermostatic Bin Control Auxiliary Code T 0 U 0 iagrams D iring a KM 901MAH air cooled and KM 901MWH water cooled 1 Thermostatic Bin Control Auxiliary Code T 0 U 0 B W umno 167 668 0154 6 9156 OISd 76 olsa 2821 no no 02 11 epo yams 553 YIH 1300 31002 diV A INO YANYOSSNVYL x ASLL 18 10 MOA indino 1euuojsuei 1110 7 1118 140 A NId d 1 46 di E Es pu 2 Y i ER ik vid x o SVOLUR d JII WS N M 8 16 0 108180 Q 300 8010 0 to to so Go 9o L 8 6 to
27. all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG 71 8 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 9 Evacuate the system and charge it with refrigerant For air cooled and water cooled models see the nameplate for the required refrigerant charge For remote air cooled models see the rating label inside the icemaker 10 Attach the expansion valve bulb to the suction line in the same location as the previous bulb The bulb should be between the 10 and 2 o clock position on the tube Be sure to secure the bulb with the clamp and holder and to insulate it 11 Place the expansion valve cover in position 12 Replace the panels in their correct positions 13 Turn on the power supply D Removal and Replacement of Hot Gas Valve or Liquid Line Valve CAUTION Always use a copper tube of the same diameter and length when replacing the valve lines otherwise performance may be affected Always replace the strainer when replacing the hot gas valve 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
28. clean water 7 Reassemble the mechanical bin control assembly and replace it in its correct position Note If the magnet was removed for cleaning be sure to replace it in its correct position 8 Reconnect the mechanical bin control switch connector 9 Move the control switch to the ICE position 10 Replace the base cover and front panel in their correct positions 11 Turn on the power supply to start the automatic icemaking process Red Connector White Harness Connector Mechanical Bin Control Mechanical Bin _ Switch Connector Control Bracket Bc Switch Mount s r Actuator Z Paddle D Float Switch Check and Cleaning 1 Float Switch Check To check the float switch follow the steps below 1 Turn off the power supply 2 Remove the front panel and move the control switch to the OFF position 3 Remove the base cover then disconnect one end of the pump tubing to drain the water tank See Fig 2 After the water tank has drained reconnect the pump tubing 4 Remove the control box cover 5 Disconnect the black float switch connector from the control board BLACK K5 Disconnect This connector End of Pump Tubing to Drain 6 Check for continuity across the float switch Water Tank leads With the water tank empty the float 1 switch should be open If open continue s a to step 7 If closed follow the steps in IV D 2 Float Switch Cleaning After cleaning the float switch check it ag
29. cycle will not a Water Supply 1 Water supply off or 1 Check and get terminate pressure too low recommended pressure Float Switch 1 Connector 1 Reconnect disconnected 2 Float does not move 2 Clean or replace See IV freely or switch D Float Switch Check and defective switch Cleaning c Control Board 1 Defective 1 See IV B Control Board Check 61 Possible Cause 3 Compressor will a Magnetic Contactor 1 Bad contacts 1 Check for continuity and not start or stops replace operating 2 Coil winding open 2 Replace b Start Capacitor or Run 1 Defective 1 Replace Capacitor c Internal Overload 1 Loose terminal 1 Tighten or replace Protector Open check 1 through 3 to the right 2 Voltage 2 Check and correct and d through f below 13 Dirty condenser d Starter 1 Bad contacts 1 Check and replace 2 Coil winding open 2 Replace e Compressor 1 Power supply not 1 Refer to nameplate and within specifications correct 2 Wiring to compressor 2 Check for loose connection or open and replace 3 Defective 3 Replace 4 Protector tripped 4 Reduce temperature f Control Board 1 No power to contactor 1 See IV B Control Board Check 4 Water continues to a Water Pressure 1 Too high be supplied in freeze b Inlet Water Valve 1 Diaphragm does not 1 Check for water leaks with cycle close icemaker off Control Board 1 Defective 1 See IV B Co
30. details see II C 3 e Bin Control Selector Harvest Pump Timer S4 Dip Switch 7 51 5 Freeze Cycle LED 1 is on Comp and FMR remain energized PM LLV and FM energize WV and HGV de energize The unit is held in freeze by a 5 minute short cycle protection timer CB will not accept a signal from F S After the 5 minute short cycle protection timer expires CB turns freeze termination over to F S Diagnosis During the first 5 minutes of freeze confirm that the evaporator temperature drops After 5 minutes in freeze disconnect black F S connector from CB BLACK K5 connector If the evaporator is not cold check to see if HGV is still open or if TXV is not opening properly if WV is continuing to fill the reservoir if there are improper unit pressures an inoperative Comp or an inoperative HM The unit should switch out of the freeze cycle G CB 15 second delay after F S opens before terminating the freeze cycle If the unit switches out of freeze with F S removed but would previously not switch out of freeze with F S connected long freeze 3 beep alarm F S may be sticking To check and clean F S see IV D Float Switch Check and Cleaning If the unit remains in freeze longer than 15 seconds on G CB after disconnecting the black F S connector replace CB See V P Removal and Replacement of Control Board Note Normal freeze cycle will last 20 to 40 minutes depending on model and conditions Cycle times and
31. kg Shipping 258 Ibs 117 kg Permanent Connection Inlet 1 2 FPT Outlet 3 4 FPT 3 8 OD Tube Float Switch Hot Gas and Water Thermistor and Timer Timer Controlled Overflow Pipe N A Thermostat Hermetic Model CS12K6E TF5 279 Air Cooled Remote Condenser Unit URC 9F Vertical type Stainless Steel and Copper Thermostatic Expansion Valve Condensing Pressure Regulator on URC 9F R404A 9 lbs 4 oz 42000 Icemaker 5 Ibs 5 oz Cond Unit 3 Ibs 15 oz High 467PSIG Low 230PSIG High Voltage Cut out Internal Auto reset Overload Protector Internal Auto reset High Pressure Control Switch Float Switch N A Ice Storage Bin Remote Condenser Unit VOLTAGE RANGE 187 253 V 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 13 4b KM 901MRH remote air cooled Auxiliary Code U 1 and Later AC SUPPLY VOLTAGE AMPERAGE MINIMUM CIRCUIT AMPACITY MAXIMUM FUSE SIZE APPROXIMATE ICE PRODUCTION PER 24 HR Ibs day kg day Reference without marks SHAPE OF ICE ICE PRODUCTION PER CYCLE APPROXIMATE STORAGE CAPACITY ELECTRIC amp WATER CONSUMPTION ELECTRIC W kWH 100 lbs WATER gal 24HR gal 100 Ibs EXTERIOR DIMENSIONS WxDxH EXTERIOR FINISH WEIGHT CONNECTIONS ELECTRIC WATER SUPPLY DRAIN CUBE CONTROL SYSTEM HARVESTING CONTROL SYSTEM ICE MAKING WATER CONT
32. oz 17600 High 467 PSIG VOLTAGE RANGE 104 127V AMBIENT TEMP 20 122 F Leg 2 pcs Hex Head Bolt w Washer 8x16 8 pcs Hex Nut 8 8 pcs Note We reserve the right to make changes in specifications and design without prior notice 16 II General Information A Construction 1 KM 901MAH air cooled Spray Tubes Water Supply Inlet Hot Gas Valve Cleaning Valve Expansion Valves Control Switch Motor Float Switch Water Pump Drier N Thermostatic Bin Control Auxiliary Code T 0 U 0 if Compressor d dm Bin Control and Bracket Thermostatic Bin Control Auxiliary Code U 1 and later Bracket amp Bulb Holder Auxiliary Code T 0 U 0 7 2 KM 901MWH water cooled Spray Tubes Water Supply Inlet Hot Gas Valve Cleaning Valve Junction Box Expansion Valves Water Regulating Valve Control Switch Control Box Float Switch Water Pump Condenser Compressor Drier Thermostatic Bin Control Auxiliary Code T 0 U 0 Mechanical Bin Control and Bracket Auxiliary Code U 1 and later Thermostatic Bin Control Bracket amp Bulb Holder Auxiliary Code T 0 U 0 18 3 KM 901MRH 3 remote air
33. power supply to start the washing process Turn off the power supply after 30 minutes Remove the front panel Disconnect one end of the pump tubing to drain the water tank After the water tank has drained reconnect the pump tubing 15 Move the control switch to the ICE position 1 11 12 13 14 16 Close the cleaning valve Note The icemaker will not operate unless the cleaning valve is completely closed 17 Replace the front panel in its correct position 18 Turn on the power supply to fill the water tank with water 84 19 20 21 22 23 24 25 26 Turn off the power supply after 3 minutes Remove the front panel and fully open the cleaning valve Move the control switch to the WASH position Replace the front panel in its correct position Turn on the power supply to rinse off the cleaning solution Turn off the power supply after 5 minutes Remove the front panel Disconnect one end of the pump tubing to drain the water tank After the water tank has drained reconnect the pump tubing 27 Repeat steps 15 through 26 three more times to rinse thoroughly Note If you do not sanitize the icemaker go to step 10 in 2 Sanitizing Procedure 2 Sanitizing Procedure Following Cleaning Procedure 1 Dilute a 5 25 sodium hypochlorite solution chlorine bleach with warm water Add 1 5 fl oz 44 ml of sanitizer to 3 gal 11
34. replace freeze cycle d Liquid Line Valve 1 Continues to close in 1 Check and replace if applicable freeze cycle Inlet Water Valve 1 Inlet water valve is 1 Check for water leaks with wide open during icemaker off freeze f Expansion Valve 1 Bulb loose 1 Secure bulb 2 Operating erratically 2 Check and replace g Headmaster C P R 11 Not operating properly 1 Replace headmaster remote condenser and liquid line unit temperature too warm h Water Supply Line Condenser water 1 Check and get water cooled model pressure too low or recommended pressure off and high pressure control opens and closes frequently i Water Regulating Valve 1 Set too high 1 Adjust or replace See water cooled model V J Adjustment of Water Regulating Valve 2 Evaporator is Frozen Up Possible Cause 1 Freeze cycle time is a Inlet Water Valve 1 Diaphragm does not 11 Check for water leaks with too long close icemaker off b Float Switch 1 Float does not move 11 Clean or replace See IV freely or defective D Float Switch Check and Switch Cleaning c Evaporator 3 Spray Tubes 63 Possible Cause 1 Freeze cycle time is f Thermistor 1 Disconnected loose 1 Connect secure check too long continued or defective See V L Removal and Replacement of Thermistor g Refrigerant 1 Low charge 1 Check for leaks Recover repair evacuate and recharge h Expansion Valv
35. specifications and design without prior notice 10 3a KM 901MRH remote air cooled Auxiliary Code T 0 U 0 AC SUPPLY VOLTAGE AMPERAGE MINIMUM CIRCUIT AMPACITY MAXIMUM FUSE SIZE APPROXIMATE ICE PRODUCTION PER 24 HR Ibs day kg day Reference without marks SHAPE OF ICE ICE PRODUCTION PER CYCLE APPROXIMATE STORAGE CAPACITY ELECTRIC amp WATER CONSUMPTION ELECTRIC W kWH 100 lbs WATER gal 24HR gal 100 Ibs EXTERIOR DIMENSIONS WxDxH EXTERIOR FINISH WEIGHT CONNECTIONS ELECTRIC WATER SUPPLY DRAIN 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 P C BOARD CIRCUIT PROTECTION COMPRESSOR PROTECTION REFRIGERANT CIRCUIT PROTECTION LOW WATER PROTECTION ACCESSORIES SUPPLIED REQUIRED OPERATING CONDITIONS 208 230 60 1 3 wire with netrual for 115V 11 6A 5 Min Freeze AT 104 F WT 80 F 20A 9 889 403 859 389 803 364 866 393 818 371 755 343 859 389 785 356 724 328 100 843 382 771 350 668 303 Crescent Cube 13 5 lbs 6 1 kg 720pcs N A 90 70 F 70 50 F 1770 5 4 1590 4 3 152 19 3 246 27 7 30 x 27 3 8 x 37 7 16 762 x 695 x 950 mm Stainless Steel Galvanized Steel Rear Net 189 Ibs 86 kg Shipping 249 Ibs 113 kg Permanent Connection Inlet 1 2 FPT Outlet 3 4 FPT 3
36. 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 Hoshizaki Technical Support at 1 800 233 1940 for recommendations 4 Dip Switch Setting Time _ No o nus OFF 5 9 6 ON ON 60 h Float Switch Control S5 dip switch 1 G Control Board CAUTION Do not adjust This must be left in the factory default position or the unit will not operate correctly Factory set S5 dip switch 1 allows for single or double float switch applications The KM 901MAH KM 901MWH and KM 901MRH 3 use a single float switch i Refill Counter S5 dip switch 2 through 5 G Control Board CAUTION Do not adjust These must be left in the factory default position or the unit will not operate correctly Factory set S5 dip switch 2 through 5 allows for refills during the freeze cycle The KM 901MAH KM901MWH and KM 901MRH 3 do not refill 35 D Bin Control 1 Thermostatic Bin Control Auxiliary Code T 0 U 0 CAUTION When the ambient temperature is below 45 F 7 C the thermostatic bin control switch opens and shuts down the icemaker even if the ice storage bin is empty When the thermostat is set in the prohibited range the icemaker operates continuously even if the ice storage bin is filled with ice Setting in the prohibited range may result in
37. the direction of the refrigerant flow When brazing protect the valve body and drier by using wet cloths to prevent the valve body and drier from overheating Do not allow the valve body or drier to exceed 250 F 121 C 1 Turn off the power supply 2 Remove the panels 3 Recover the refrigerant and store it in an approved container 4 Remove the bolt and the solenoid 5 Disconnect the valve If replacing the hot gas valve also remove the strainer 6 Place the new valve and strainer if applicable in position 7 Remove the drier then place the new drier in position 8 Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG 9 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 72 10 Evacuate the system and charge it with refrigerant For air cooled and water cooled models see the nameplate for the required refrigerant charge For remote air cooled models see the rating label inside the icemaker 11 Replace the solenoid in its correct position 12 Replace the panels in their correct positions 13 Turn on the power supply E Removal and Replacement of Evaporator CAUTION Always install a new drier every time the sealed refrigerati
38. the replacement compressor Due to the ability of the POE oil in the compressor to absorb moisture quickly the compressor must not be opened more than 15 minutes for replacement or service Do not mix lubricants of different compressors even if both are charged with R 404A except when they use the same lubricant 1 Turn off the power supply 2 3 4 Remove the terminal cover on the compressor and disconnect the compressor wiring On remote air cooled models disconnect the crankcase heater Remove the panels Recover the refrigerant and store it in an approved container 5 Remove the discharge suction and process pipes 6 Remove the hold down bolts washers and rubber grommets 7 Remove the compressor Unpack the new compressor package 70 8 9 10 1 12 13 Attach the rubber grommets of the prior compressor to the new compressor Place the compressor in position and secure it using the bolts and washers Remove the drier then place the new drier in position Remove the plugs from the suction discharge and process pipes Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG SS a o 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
39. the reverse order of which they were removed 7 Replace the panels in their correct positions 8 Remote air cooled model replace the junction box cover in its correct position 9 Turn on the power supply N Removal and Replacement of Inlet Water Valve 1 Turn off the power supply 2 Close the icemaker water supply line shut off valve Open the icemaker water supply line drain valve 3 Remove the front panel 4 Disconnect the valve outlet tubing by releasing the clamp 5 Loosen the fitting nut Be careful not to lose the washer 6 Disconnect the terminals from the inlet water valve 7 Remove the bracket and valve from the unit 8 Install the new valve Replace the removed parts in the reverse order of which they were removed Make sure the washer is in place in the fitting nut 9 Close the icemaker water supply line drain valve Open the icemaker water supply line shut off valve 10 Turn on the power supply 11 Check for leaks 80 12 Replace the front panel in its correct position 13 Turn on the power supply O Removal and Replacement of Pump Motor 1 Turn off the power supply 2 Remove the front panel 3 Remove the base cover then disconnect one end of the pump tubing to drain the water tank See Fig 6 After the water tank has drained reconnect the pump tubing 5 Disconnect the pump suction and discharge hoses 6 Remove the closed end connectors from the pump motor leads 7 Remove the screw a
40. to 4 PSIG 11 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 12 Evacuate the system and charge it with refrigerant See the nameplate for the required refrigerant charge 13 Replace the removed parts in the reverse order of which they were removed 14 Replace the panels in their correct positions 15 Turn on the power supply 74 G Removal and Replacement of Water Cooled Condenser CAUTION 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 Turn off the power supply 2 Remove the panels 3 Close the condenser water supply line shut off valve If connected to a closed loop water supply also close the condenser return outlet shut off valve 4 Open the condenser water supply line drain valve If connected to a closed loop water supply also open the condenser return outlet drain valve 5 Attach a compressed air or carbon dioxide supply t
41. when the control switch is moved to the ICE position The red LED indicates proper control voltage and remains on unless a control voltage problem occurs The green LEDs 1 through 4 energize and sequence from initial startup as listed in the table below Note that the order of the LEDs from the outer edge of the control board is 1 4 3 2 For details see II B Sequence of Operation Energized Time LEDs are On 77 pus 0000 ee e 1 Minute Fill Cycle 14 minute Freeze Cycle 1 Comp FM FMR PM 5 minutes freeze timer 30 to 35 minutes LLV setting Pump Out Cycle Comp FMR WV PM 10 seconds 20 seconds pump out timer HGV setting The built in safeties shut down the unit and have alarms as listed below No of Beeps 1 High Evaporator Temp Check for harvest problem stuck HGV or relay hot temperature gt 127 F water entering unit stuck HM or shorted thermistor 53 C 2 Harvest Backup Timer Check for open thermistor HGV not opening TXV or harvest gt 20 min for two cycles LLV leaking by low charge inefficient Comp or WRV in a row leaking by 3 Freeze Timer Check for F S stuck closed up WV leaking by HGV freeze gt freeze timer setting for leaking by PM not pumping TXV not feeding properly two cycles in a row LLV not opening low charge HM not bypassing or inefficient Comp To reset the above safeties press the ALARM RESET button with the power supply on Low Voltage Red
42. will help you verify your diagnosis Alarm Reset If the control board is in alarm beeping press the ALARM RESET button on the control board with power on Once reset the unit starts at the 1 minute fill cycle For audible alarm information see II C 2 f LED Lights and Audible Alarm Safeties 1 Check the dip switch settings to assure that S4 dip switch 3 4 7 8 9 amp 10 and S5 dip switch 1 through 5 G control board are in the factory default position S4 dip switch 1 2 5 amp 6 are cleaning adjustments and the settings are flexible For factory default settings see II C 3 a Default Dip Switch Settings 2 Move the control switch to the ICE position If the red POWER OK LED is on the control voltage is good If the POWER OK LED is off check the control transformer secondary circuit The control transformer secondary circuit includes the cleaning valve interlock switch Make sure the interlock switch is closed otherwise no control voltage is supplied to the K2 connector Transformer output is 10 5V at 115V primary input If the secondary circuit has proper voltage and the red LED is off the control board is bad and should be replaced See V P Removal and Replacement of Control Board If the secondary circuit does not have proper voltage check the control transformer primary circuit Check for 115V at the control board K1 ten pin connector Check the 10 pin BR wire to a white neutral wire for 115V Always
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44. 1 of water 2 Remove the insulation panel 3 Pour the sanitizing solution into the water tank 4 Replace the insulation panel and the front panel in their correct positions Note Make sure that the control switch is in the WASH position and the cleaning valve is open 5 6 7 8 Turn on the power supply to start the sanitizing process Turn off the power supply after 15 minutes Remove the front panel Disconnect one end of the pump tubing to drain the water tank After the water tank has drained reconnect the pump tubing 9 Repeat steps 15 through 26 in 1 Cleaning Procedure two times to rinse thoroughly 10 Close the cleaning valve 11 Move the control switch to the ICE position 12 Replace the front panel and the base cover in their correct positions 13 Clean the storage bin liner using a neutral cleaner Rinse thoroughly after cleaning 14 Turn on the power supply to start the automatic icemaking process 85 B Maintenance This icemaker must be maintained individually referring to the instruction manual and labels provided with the icemaker A WARNING 1 Only qualified service technicians should attempt to service or maintain this icemaker 2 Disconnect power before performing service or maintenance 1 Stainless Steel Exterior To prevent corrosion wipe the exterior occasionally with a clean soft cloth Use a damp cloth containing a neutral cleaner to wipe off oi
45. 1 yg di 17 17014 il b 4 n 10 y H x I 1 sogi 2111 nie INI an 1 iz d lli ri o MS 31M fe 1010 4 N fe 6 vl 300 4010 10 H 0 Dig 0 Qo bo i lo E to 9 6c ato nmm 0718116 1 9 MS 1v011 pg UN 19 jl e L WINNT 7 n i d 15 oT FO Ow 8 HILIMS 3 to TOULNOD 6 1 c x 0 il x NN ku 1 P ol 1 1 jj 08 uyog 01 834 4 ae DINO ASLE 0 CIEN HLIM INIM 957 43 b KM 901MRH remote air cooled Auxiliary Code U 1 and Later Mechanical Bin Control 1110 12 U91IAS 9415859414 uBiH UOMO At Mi NYY I INN Hun 31048 yg gt R 3 AGILE 3 AS OL indino 13 01015011 7 4 4 Og i n pal H 3 ing 9 IATA 4 10 2 y eedah Wm S 4 e ESL 3 ali j NS n 1 9 M 7 d Talin 2 7 ms 5 gO X J n bl 0 Qo 49 6 0 to Ol o _ y Lo fs a40 E 0 UNIS 27 151 mm P N 5 10111117 7 Cotte 8 ap Kann 9 x HOLMS ry he 1091402
46. 116 kg Permanent Connection Inlet 1 2 FPT Outlet 3 4 FPT 3 8 OD Tube Float Switch Hot Gas and Water Thermistor and Timer Timer Controlled Overflow Pipe N A Thermostat Hermetic Model CS12K6E PFV 237 Air Cooled Fin and tube type Vertical type Stainless Steel and Copper Thermostatic Expansion Valve R404A 2 Ib 15 oz 1320g High 467PSIG Low 230PSIG High Voltage Cut out Internal Auto reset Overload Protector Internal Auto reset High Pressure Control Switch Float Switch N A Ice Storage Bin VOLTAGE RANGE 187 253 V 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 1b KM 901MAH air cooled Auxiliary Code U 1 and Later AC SUPPLY VOLTAGE AMPERAGE MINIMUM CIRCUIT AMPACITY MAXIMUM FUSE SIZE APPROXIMATE ICE PRODUCTION PER 24 HR Ibs day kg day Reference without marks SHAPE OF ICE ICE PRODUCTION PER CYCLE APPROXIMATE STORAGE CAPACITY ELECTRIC amp WATER CONSUMPTION ELECTRIC W KVVH 100 lbs WATER gal 24HR gal 100 Ibs EXTERIOR DIMENSIONS WxDxH EXTERIOR FINISH WEIGHT CONNECTIONS ELECTRIC WATER SUPPLY DRAIN 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 P C BOA
47. 117 M NMOUG 0 40109 40 IND s m x Ken ASIL e 904 0 00000 i 170000 jeuuojsue4 lore T y 4 1 n W P 4 EM yo a zo 8M 1 WK D AWA JAWA 1 ol 98910 Wl J 1 KS NS 7001107 lo o to Pow Hs Co m 0 45 1 6 19 HS dV D n to 4 im 1 0 7 4 lef 0 WO 14 gt E en 1 toji 10 S om m tol po E 1 10171107 7 8 lo T Z dx E Vol t1 el qevoa YOLSTNYIHL 1011 101110 NIG 1000 109 0 2 907 42 0154 4 6 Olsa 167 668 umno DISd 6 OlSd 7 Auxiliary Code U 1 and Later 2 Mechanical Bin Control a KM 901MAH air cooled and KM 901MWH water cooled Mechanical Bin Control Auxiliary Code U 1 and Later lepow yams 9415594141 ub 1300 431002 HIV AINO sy n 91 YE AS OL 0000 O e ndino 13 01015021 O OOOO uni J m pi 1
48. 90 F 32 C PRESSURE DROP OF COOLING WATER LINE less than 10 PSIG Note 1 Pressure data is recorded at 5 minutes into freeze 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 47 3 KM 901MRH remote air cooled APPROXIMATE ICE AMBIENT TEMP WATER TEMP F C 70 21 80 27 90 32 Ibs 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 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 6 100 38 SUCTION PRESSURE 70 21 80 27 90 32 PSIG kg cm G 100 38 TOTAL HEAT OF REJECTION FROM CONDENSER 14 000 BTU h AT 90 F 32 C WT 70 F 21 C TOTAL HEAT OF REJECTION FROM COMPRESSOR 2 200 BTU h AT 90 F 32 C WT 70 F 21 C CONDENSER VOLUME 121 CU IN URC 9F Note 1 Pressure data is recorded at 5 minutes into freeze 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 48 4 KM 901MRH3 remote air cooled APPROXIMATE ICE AMBIENT TEMP WATER TEMP F C PRODUCTION PER 24 HR F C 50 10 70 21 90 32 70 21 80 27 90 32 Ibs day kg day 100 38 APPROXIMATE ELE
49. 969 Ho 437 wNAdO 28 uo 431 N3dO Od AMO A uo 0311 5 2 98 994 pezi amp 1eue ep slu uoduuoo Ho 431 GSSO19 Od 4 p solo 41 senunuoo 31 N4dO 98 uedo JAN uomnejedo OAWN enoqe 1 01 JSAAIBY 1xeu 948 JO pue y e ASIMJAUIO seJdxe 1 uun uonoejoJd 13 32 uous uluu G y oes 91 1989 je D TEAHDE 12 1179 Jaye 998 929914 Serey 948 JO pue y 15 PAPAY ejo o 233 y 998 G 0 dn 40 l JsaAJeY BY JO pue eui 1y 9 9 2 1S AHEH OAD OMUIN L L ye spes Jayewed Joyenjoe 28 1 1901268 06 026 6 0 808 Jaye 98S 9 14 991 ON 0 A 3 000006037 26 umopinys 1 2153 11 pue p949M07 9 9 99 HO 3120131 Z uig L umopinys 114 e1nurjA 01 suini i 013 2 pue sdojs JOSssesdwod uado sI S 3 uedo S 4 gt Y 21 ADH sues 155 2 559 6216 9 9 6 0 6 4 87 89408 21 dwog 1018111 senunuoo AM 2 A11 pezib1eue ep NJ 08S 05 01 404 5 3 Q S Z 404 9921649 9 9 Nd 21 ADH 99 8 09 HIN 2 ADH pezibieue ATI pezibieue SWA 0921649 9 Wd s nunuo SeJidxe 1euun senunuoo dwog ue
50. CTRIC 70 21 CONSUMPTION 80 27 90 32 watts 100 38 APPROXIMATE WATER 70 21 CONSUMPTION PER 24 HR 80 27 90 32 gal day 7 100 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 6 100 38 SUCTION PRESSURE 70 21 80 27 90 32 PSIG kg em G 100 38 TOTAL HEAT OF REJECTION FROM CONDENSER 14 100 BTU h AT 90 F 32 C WT 70 F 219C TOTAL HEAT OF REJECTION FROM COMPRESSOR 2 200 BTU h AT 90 F 32 C WT 70 F 21 C CONDENSER VOLUME 121 CU IN URC 9F Note 1 Pressure data is recorded at 5 minutes into freeze 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 49 IV Service Diagnosis A WARNING This unit should be diagnosed and repaired only by qualified service personnel to reduce the risk of death electric shock serious injury or fire Risk of electric shock Use extreme caution and exercise safe electrical practices 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 unit is serviced Make sure that none have fallen into the storage bin Make sure all food zones in the icemaker and storage bin are clean after the unit is serviced For cleaning procedures see VI Cleaning and Maintenance A Di
51. Hoshizaki America Inc Modular Crescent Cuber Models KM 90 MAH KM 90 IMWH KM 90 MRH 3 SERVICE MANUAL A Superior Degree of Reliability www hoshizaki com YOESAVER evercheck Number 73156 Issued 4 18 2008 Revised 6 23 2009 IMPORTANT Only qualified service technicians should install service and maintain the icemaker No service or maintenance should be undertaken until the technician has thoroughly read this Service Manual Failure to service and maintain the equipment in accordance with this manual may adversely affect safety performance component life and warranty coverage Hoshizaki provides this manual primarily to assist qualified service technicians in the service and maintenance of the icemaker Should the reader have any questions or concerns which have not been satisfactorily addressed please call write or send an e mail message to the Hoshizaki Technical Support Department for assistance HOSHIZAKI AMERICA INC 618 Highway 74 South Peachtree City GA 30269 Attn Hoshizaki Technical Support Department Phone 1 800 233 1940 Technical Support 770 487 2331 Fax 1 800 843 1056 770 487 3360 E mail techsupport hoshizaki com Web Site www hoshizaki com NOTE To expedite assistance all correspondence communication MUST include the following information Model Number Serial Number Complete and detailed explanation of the problem
52. LED turns off if voltage protection operates 92Vac 5 or less The control voltage safeties automatically reset when High Voltage voltage is corrected 147Vac 5 or more Legend Comp compressor FM fan motor FMR fan motor remote F S float switch HGV hot gas valve HM headmaster C P R LLV liquid line valve PM pump motor TXV thermostatic expansion valve VVRV vvater regulating valve WV inlet water valve 31 3 Controls and Adjustments CAUTION 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 a Default Dip Switch Settings The dip switches are factory set to the following positions S4 Dip Switch SippSwenwe 1 2 s 4 s e 7 5 10 oFF oFF O OFE OFF O S5 Dip Switch G Control Board Auxiliary Code U 1 and Later SsDpSwinNo 1 2 3 4 Freeze Timer 9 amp 10 actory Use 8 Bin Control Selector 7 E Control Board Harvest Pump Timer 7 G Control Board Do Not Adjust Pump Out Frequency Control 5 amp 6 Pump Out Timer 3 amp 4 Harvest Timer 1 amp 2 b Harvest Timer S4 dip switch 1 amp 2 The harvest timer when the thermistor reads 48 F 9 C at the evaporator outlet and the control board reads the thermistor s 3 9 kO signal The harvest timer is factory set and generally no adjustment is required How
53. Lead Cable Tie 6 Scrape away the old sealant on the n n 2 thermistor holder and the suction pipe mu A On 4 2 71 7 Wipe off moisture or condensation on the suction pipe MM 8 Smoothly apply recommended sealant A AA A O KA A KE4560RTV Part Code 60Y000 11 f f or 4A0683 01 to the thermistor holder Foam Insulation concave Fig 5 9 Attach the new thermistor to the suction pipe in the same position as the previous thermistor Be very careful to prevent damage to the leads Secure it using the thermistor holder and recommended foam insulation SQ SS 79 10 Secure the insulation using plastic cable ties 11 Connect the white thermistor connector through the bushing of the control box to the control board WHITE K3 connector Note Do not cut the leads of the thermistor 12 Replace the control box cover and the panels in their correct positions 13 Turn on the power supply M Removal and Replacement of Fan Motor air cooled and remote air cooled models Note When replacing a fan motor with defective winding it is recommended that a new capacitor be installed 1 Turn off the power supply 2 Remove the panels 3 Remote air cooled model remove the junction box cover from the remote condenser unit 4 Disconnect the fan motor wires 5 Remove the fan motor bracket and fan motor 6 Install the new fan motor connect the fan motor wires and replace the removed parts in
54. M circuit and capacitor check 5 pin DBu wire on CB K1 ten pin connector for voltage If water does not pump out check and clean the check valve assembly and tubing 52 7 Normal Harvest Cycle same as the initial harvest cycle See IV A 4 Initial Harvest Cycle 8 Shutdown a Thermostatic Bin Control Auxiliary Code T 0 U 0 When the unit is running hold ice in contact with the thermostatic bulb TBC switch opens within 10 seconds shutting down the unit TBC is factory set and generally no adjustment is required However adjustment may be needed in some conditions particularly at higher altitude locations CAUTION Do not adjust S4 dip switch 7 out of the factory default position on this model This dip switch must be left in the factory default position or this unit will not operate correctly Diagnosis See IV C 1 Thermostatic Bin Control Check b Mechanical Bin Control Auxiliary Code U 1 and Later See IV C 2 a Mechanical Bin Control Check Legend CB control board Comp compressor FM fan motor FMR fan motor remote F S float switch HGV hot gas valve HM headmaster C P R LLV liquid line valve MBC mechanical bin control PM pump motor TBC thermostatic bin control TXV thermostatic expansion valve WV inlet water valve B Control Board Check Before replacing a control board that does not show a visible defect and that you suspect is bad always conduct the following check procedure This procedure
55. PSIG Note We reserve the right to make changes in specifications and design without prior notice 14 B Condenser Uni 1 URC 9F 846 100 Pull ww qun 81 097 1 LI GeV LES Vl 01 066 4 2 96 196 711 082 15 Specifications MODEL URC 9F AC SUPPLY VOLTAGE FAN MOTOR EXTERIOR DIMENSIONS WxDxH DIMENSIONS INCLUDING LEGS WxDxH EXTERIOR FINISH WEIGHT CONNECTIONS ELECTRIC REFRIGERANT CONDENSER FAN MOTOR PROTECTION REFRIGERANT CONTROL REFRIGERANT CHARGE DESIGN PRESSURE OPERATING CONDITIONS ACCESSORIES SUPPLIED 115 60 1 Connection to Icemaker 115 V Total 1 3FLA 65W 32 3 16 x 15 11 16 x 21 15 16 817 x 398 x 558 mm 34 5 16 x 18 1 8 x 36 15 16 871 x 460 x 938 mm Galvanized Steel Net 81 Ibs 37 Shipping 92 Ibs 42 kg Permanent Connection Discharge Line 1 1 16 12 UNF Fitting 10 AEROQUIP Liquid Line 5 8 18 UNF Fitting 6 AEROQUIP Air cooled Fin and tube type Thermal Protection Condensing Pressure Regulator R 404A 3 55 14 8
56. RANT CONTROL REFRIGERANT CHARGE DESIGN PRESSURE P C BOARD CIRCUIT PROTECTION COMPRESSOR PROTECTION REFRIGERANT CIRCUIT PROTECTION LOW WATER PROTECTION ACCESSORIES SUPPLIED REQUIRED OPERATING CONDITIONS 208 230 60 1 3 wire with netrual for 115V 11 6A 5 Min Freeze AT 104 F WT 80 F 20A 20A Ambient WATER TEMP F TempCF 50 90 70 889 403 859 389 803 364 80 866 393 818 371 755 343 90 859 389 785 356 724 328 100 843 382 771 350 668 303 Crescent Cube 13 5 Ibs 6 1 kg 720pcs N A 90 70 F 70 50 F 1770 5 4 1590 4 3 152 19 3 246 27 7 30 x 27 3 8 x 37 7 16 762 x 695 x 950 mm Stainless Steel Galvanized Steel Rear Net 189 Ibs 86 kg Shipping 249 Ibs 113 kg Permanent Connection Inlet 1 2 FPT Outlet 3 4 FPT 3 8 OD Tube Float Switch Hot Gas and Water Thermistor and Timer Timer Controlled Overflow Pipe N A Mechanical Switch Hermetic Model CS12K6E PFV 279 Air Cooled Remote Condenser Unit URC 9F Vertical type Stainless Steel and Copper Thermostatic Expansion Valve Condensing Pressure Regulator on URC 9F R404A 9 Ibs 4 oz 42000 Icemaker 5 Ibs 5 oz Cond Unit 3 Ibs 15 oz High 467PSIG Low 230PSIG High Voltage Cut out Internal Auto reset Overload Protector Internal Auto reset High Pressure Control Switch Float Switch N A Ice Storage Bin Remote Condenser Unit VOLTAGE RANGE 187 253 V AMBIENT TEMP
57. RD CIRCUIT PROTECTION COMPRESSOR PROTECTION REFRIGERANT CIRCUIT PROTECTION LOW WATER PROTECTION ACCESSORIES SUPPLIED REQUIRED OPERATING CONDITIONS 208 230 60 1 3 wire with netrual for 115V 11 4 A 5 Min Freeze AT 104 F WT 80 F 20A 20A Ambient WATER TEMP F TempCF 50 70 90 874 396 832 378 785 356 Crescent Cube 13 6 Ibs 6 2 kg 720pcs N A 90 70 F 70 50 F 1710 5 6 1600 4 4 143 19 6 240 27 5 30 x 27 3 8 x 37 7 16 762 x 695 x 950 mm Stainless Steel Galvanized Steel Rear Net 196 Ibs 89 kg Shipping 256 Ibs 116 kg Permanent Connection Inlet 1 2 FPT Outlet 3 4 FPT 3 8 OD Tube Float Switch Hot Gas and Water Thermistor and Timer Timer Controlled Overflow Pipe N A Mechanical Switch Hermetic Model CS12K6E PFV 237 Air Cooled Fin and tube type Vertical type Stainless Steel and Copper Thermostatic Expansion Valve R404A 2 Ib 15 oz 1320g High 467PSIG Low 230PSIG High Voltage Cut out Internal Auto reset Overload Protector Internal Auto reset High Pressure Control Switch Float Switch N A Ice Storage Bin VOLTAGE RANGE 187 253 V 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 2a KM 901MWH water cooled Auxiliary Code T 0 U 0 AC SUPPLY VOLTAGE AMPERAGE MINIMUM CIRCUIT AMPACITY MA
58. RD CIRCUIT PROTECTION COMPRESSOR PROTECTION REFRIGERANT CIRCUIT PROTECTION LOW WATER PROTECTION ACCESSORIES SUPPLIED REQUIRED OPERATING CONDITIONS 208 230 60 1 3 wire with netrual for 115V 8 7A 5 Min Freeze AT 104 F WT 80 F 15A Ambient WATER TEMP F 900 012 414 889 403 849 385 895 406 860 390 815 370 889 403 835 379 791 359 878 398 825 374 751 341 Crescent Cube 13 4 Ibs 6 1 kg 720pcs N A 90 70 F 70 50 F 1570 4 5 1480 3 9 182 21 8 245 26 9 1162 139 631 69 30 x 27 3 8 x 37 7 16 762 x 695 x 950 mm Stainless Steel Galvanized Steel Rear Net 189 Ibs 86 kg Shipping 249 Ibs 113 kg Permanent Connection Inlet 1 2 FPT Outlet 3 4 FPT 3 8 OD Tube Cond Inlet Cond Outlet 1 2 FPT 3 8 FPT Float Switch Hot Gas and Water Thermistor and Timer Timer Controlled Overflow Pipe Pressure Regulator Mechanical Switch Hermetic Model CS12K6E PFV 237 Water cooled Tube in tube type Vertical type Stainless Steel and Copper Thermostatic Expansion Valve R404A 1 Ib 15 4 oz 890g High 427PSIG Low 230PSIG High Voltage Cut out Internal Auto reset Overload Protector Internal Auto reset High Pressure Control Switch Float Switch N A Ice Storage Bin VOLTAGE RANGE AMBIENT TEMP WATER SUPPLY TEMP WATER SUPPLY PRESSURE 187 253 V 45 100 F 45 90 F 10 113 PSIG Note We reserve the right to make changes in
59. ROL COOLING WATER CONTROL BIN CONTROL SYSTEM COMPRESSOR CONDENSER EVAPORATOR REFRIGERANT CONTROL REFRIGERANT CHARGE DESIGN PRESSURE P C BOARD CIRCUIT PROTECTION COMPRESSOR PROTECTION REFRIGERANT CIRCUIT PROTECTION LOW WATER PROTECTION ACCESSORIES SUPPLIED REQUIRED OPERATING CONDITIONS 208 230 60 3 7 0A 5 Min Freeze AT 104 F WT 80 F 20A WATER TEMP F 50 70 9 899 408 874 397 817 371 Crescent Cube 14 2 Ibs 6 4 kg 720pcs N A 90 70 F 70 50 F 1830 5 4 1670 4 5 147 18 0 254 28 2 30 x 27 3 8 x 37 7 16 762 x 695 x 950 mm Stainless Steel Galvanized Steel Rear Net 198 Ibs 90 kg Shipping 258 Ibs 117 kg Permanent Connection Inlet 1 2 FPT Outlet 3 4 FPT 3 8 OD Tube Float Switch Hot Gas and Water Thermistor and Timer Timer Controlled Overflow Pipe N A Mechanical Switch Hermetic Model CS12K6E TF5 279 Air Cooled Remote Condenser Unit URC 9F Vertical type Stainless Steel and Copper Thermostatic Expansion Valve Condensing Pressure Regulator on URC 9F R404A 9 lbs 4 oz 42000 Icemaker 5 Ibs 5 oz Cond Unit 3 Ibs 15 oz High 467PSIG Low 230PSIG High Voltage Cut out Internal Auto reset Overload Protector Internal Auto reset High Pressure Control Switch Float Switch N A Ice Storage Bin Remote Condenser Unit VOLTAGE RANGE 187 253 V AMBIENT TEMP 45 100 F WATER SUPPLY TEMP 45 90 F WATER SUPPLY PRESSURE 10 113
60. XIMUM FUSE SIZE APPROXIMATE ICE PRODUCTION PER 24 HR Ibs day kg day Reference without marks SHAPE OF ICE ICE PRODUCTION PER CYCLE APPROXIMATE STORAGE CAPACITY ELECTRIC amp WATER CONSUMPTION ELECTRIC W kWH 100 lbs WATER gal 24HR gal 100 Ibs WATER COOLED CONDENSER gal 24HR gal 100 Ibs EXTERIOR DIMENSIONS WxDxH EXTERIOR FINISH WEIGHT CONNECTIONS ELECTRIC WATER SUPPLY DRAIN 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 P C BOARD CIRCUIT PROTECTION COMPRESSOR PROTECTION REFRIGERANT CIRCUIT PROTECTION LOW WATER PROTECTION ACCESSORIES SUPPLIED REQUIRED OPERATING CONDITIONS 208 230 60 1 3 wire with netrual for 115V 8 7A 5 Min Freeze AT 1047 WT 80 F 15A 15A Ambient WATER TEMP F Temp F 70 598 912 414 889 403 849 385 895 406 860 390 815 370 889 403 835 379 791 359 878 398 825 374 751 341 Crescent Cube 13 4 Ibs 6 1 kg 720pcs N A 90 70 F 70 50 F 1570 4 5 1480 3 9 182 21 8 245 26 9 1162 139 631 69 30 x 27 3 8 x 37 7 16 762 x 695 x 950 mm Stainless Steel Galvanized Steel Rear Net 189 Ibs 86 kg Shipping 249 Ibs 113 kg Permanent Connection Inlet 1 2 FPT Outlet 3 4 FPT 3 8 OD Tube Cond Inlet Cond Outlet 1 2 FPT 3 8
61. ads a 3 9 kO signal 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 seconds For details see II C 3 b Harvest Timer S4 dip switch 1 amp 2 WV is energized during harvest for a maximum of 6 minutes or the length of harvest whichever is shorter LED 4 goes off when WV de energizes When the harvest timer expires the harvest cycle is complete CB checks the position of F S and proceeds to the next cycle if it is closed or calls for a 1 minute fill cycle if it is open The minimum total time allowed by CB for a complete harvest cycle is 2 minutes 3 Freeze Cycle LED 1 is on Comp and FMR remain energized PM FM and LLV energize HGV and WV de energize For the first 5 minutes CB will not accept a signal from F S This minimum 5 minute freeze time is short cycle protection for Comp At the end of 5 minutes F S assumes control As ice builds on the evaporator the water level in the tank lowers The freeze cycle continues until F S opens and terminates the cycle 4 Pump Out Cycle LEDs 1 3 and 2 are on LED 4 is on when S4 dip switch 3 amp 4 are set to 3 off and 4 on Comp and FMR remain energized HGV energizes WV energizes if S4 dip switch 3 off and 4 on LLV and FM de energize PM stops for 2 seconds then reverses taking water from the bottom of the tank and forcing pressure against the check valve seat allowing water to go
62. against the check valve seat allowing water to go through the check valve and down the drain At the same time water flows through the small tube to power flush F S When the pump out timer expires the pump out is complete The first pump out occurs after the 11th freeze cycle then every 10th cycle thereafter The pump out frequency control is factory set and 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 S4 dip switch 5 amp 6 can be set to have a pump out occur every cycle or every 2 5 or 10 cycles Timing of the first pump out is dependent on S4 dip switch 5 amp 6 settings See the table below For details see II C 3 d Pump Out Frequency Control S4 dip switch 5 amp 6 G Control Board Settings 4 Dip Switch Setting Pump Out ETTTM Frequency FF FF ON ON 16 5 5 Harvest Cycle Same as the initial harvest cycle See II B 1 b 2 Initial Harvest Cycle Note Unit continues to cycle until MBC is satisfied or power is turned off The unit always restarts at the 1 minute fill cycle 22 6 Shutdown When MBC is activated MBC open the yellow BC OPEN LED comes on The unit then shuts down as outlined in the table below Cycle at Mechanical Bin Control Activation Fill Cycle 15 seconds after activation Harvest Cycle At the end of the harvest cycle or u
63. agnostic Procedure The diagnostic procedure is basically a sequence check which can be used at unit startup or for system diagnosis This procedure allows you to diagnose electrical system and component failures Before conducting the diagnostic procedure check for correct installation proper voltage per unit nameplate and adequate water supply Check CB using the steps in IV B Control Board Check Check the dip switch settings to assure that S4 dip switch 3 4 7 8 9 amp 10 and S5 dip switch 1 through 5 G CB are in the factory default position S4 dip switch 1 2 5 amp 6 are cleaning adjustments and the settings are flexible For factory default settings see II C 3 a Default Dip Switch Settings As you go through the procedure check to assure the components energize and de energize correctly If not those components and controls are suspect 1 Turn off the power supply then access the control box Clear any ice from TBC or MBC 2 Turn on the power supply then move the control switch to the ICE position A 5 second delay occurs The red POWER OK LED on CB comes on On G CB the green BC CLOSED LED also comes on If the yellow BC OPEN LED is on indicating a full bin check MBC See IV C 2 a Mechanical Bin Control Check A WARNING 1 Risk of electric shock Use extreme caution and exercise safe electrical practices 2 Moving parts e g fan blade can crush and cut Keep hands clear 50 3 1 Min
64. ain Replace if necessary Ee ow 7 Reconnect the black float switch connector Base Cover then replace the control box cover in its correct position Fig 2 8 Move the control switch to the ICE position Replace the front panel in its correct position then turn on the power supply After 1 minute the 1 minute fill cycle should end and the initial harvest cycle should begin If the initial harvest cycle begins the float switch is good and the check is complete If the initial harvest cycle does not begin continue to step 9 9 Turn off the power supply 10 Remove the front panel 11 Move the control switch to the OFF position 12 Remove the control box cover 13 Disconnect the black float switch connector from the control board BLACK K5 connector 14 Check for continuity across the float switch leads With the water tank full the float switch should be closed If the float switch is closed and the icemaker will not switch from the 1 minute fill cycle to the initial harvest cycle replace the control board See V P Removal and Replacement of Control Board If the float switch is open confirm that the water tank is full If the tank is not full check the water supply water filters and inlet water valve If the tank is full follow the steps in IV D 2 Float Switch Cleaning After cleaning the float switch check it again Replace if necessary 57 2 Float Switch Cleaning Depending on l
65. ard OUTPUT TEST Button used to test relays on control board Bin Control Switch Closed LED green S4 Dip ALARM RESET Button Switch on continuously in thermostatic bin control application miu O WHITE K3 connector Bin Control Switch x 4 t Control Open LED yellow 175700 c V rv 7 ME LLL E thermistor 5 application only SH 5 qp 22 Ug w m 22 8 Part Number sss SOM nu L RED K4 Connector Name oon Eg m X Mechanical Bin Control or arm Duzzer 999 K4 Jumper thermostatic S T bin control application Power LED red zm PH ssDip Switch lights when mm E power is supplied LS BLACK K5 Connector 2 1 to the control board TT Float Switch Relay LEDs 4 1 P indicate which o MEN Label relays are energized control board revision as listed below level indicated on label LED 2 X2 Relay o on side of relay Hot Gas Valve HGV K1 Ten Pin Connector Fan Motor FM 2 9 Pins 1 through 10 FM off when LED on Liquid Line LLV 1 9 Magnetic Contactor o 00 2 Hot Gas Valve HGV 3 Fan Motor FM ES 7 o oo Liquid Line Valve LLV on at pump out a 4 Pump Motor icemaking harvest if applicable ofa o cj x
66. arvest whichever is shorter G CB WV is energized during harvest for a maximum of 6 minutes or the length of harvest minus 0 or 50 seconds harvest pump timer S4 dip switch 7 whichever is shorter LED 4 goes off when WV de energizes LED 3 comes on and PM energizes and runs for the last O or 50 seconds of harvest depending on S4 dip switch 7 setting CAUTION Do not adjust S4 dip switch 7 out of the factory default position on this model This dip switch must be left in the factory default position or this unit will not operate correctly For details see II C 3 e Bin Control Selector Harvest Pump Timer S4 Dip Switch 7 Diagnosis Check if Comp is running HGV and WV still energized Average harvest cycle at factory setting is 2 to 3 minutes How long does initial harvest last 1 5 minutes after initial harvest begins touch Comp discharge line Is it hot If not check refrigerant pressures and Comp operation If it is hot touch the inlet line to the evaporator Is it hot If it is hot and the freeze cycle is not starting check the harvest timer adjustment S4 dip switch 1 amp 2 the thermistor for open circuit the discharge line temperature Comp efficiency and if HGV is fully open For a thermistor check see IV E Thermistor Check If 1 minute fill cycle starts after harvest check that F S is clean and operating properly see IV D Float Switch Check and Cleaning Make sure PM does not come on last 50 seconds of harvest For
67. choose a white neutral wire to establish a good neutral connection when checking voltages For additional checks see IV F 1 1 The icemaker will not start 53 3 The OUTPUT TEST button provides a relay sequence test Make sure the control switch is in the ICE position then press the OUTPUT TEST button For the correct lighting sequence see the table below Note that the order of the LEDs from the outer edge of the control board is 1 4 3 2 Components e g compressor cycle during the test Control Correct LED Board Lighting Sequence Following the test the icemaker resumes operation If the LEDs do not light as described above the control board is bad and should be replaced See V P Removal and Replacement of Control Board 4 To verify voltage output from the control board to the components slide the control board K1 ten pin connector out far enough to allow multimeter lead contact With the unit in the cycle to be tested check output voltage from the corresponding pin on the control board K1 ten pin connector to ground If output voltage is not found and the appropriate LED is on the control board is bad and should be replaced See V P Removal and Replacement of Control Board C Bin Control Check 1 Thermostatic Bin Control Check Auxiliary Code T 0 U 0 To check the thermostatic bin control follow the steps below CAUTION When the ambient temperature is below 45 F 7 C the thermostatic bin cont
68. control board See V P Removal and Replacement of Control Board Cycle at Mechanical Bin Control Activation Fill Cycle 15 seconds after activation Harvest Cycle At the end of the harvest cycle or up to 15 seconds into the freeze cycle if activated at the end of the harvest cycle Freeze Cycle 15 seconds after activation if activated at least 15 seconds before the 5 minute short cycle protection timer expires Otherwise at the end of the next harvest cycle 55 b Mechanical Bin Control Cleaning Scale may build up on the mechanical bin control Scale can cause the actuator paddle and magnet to stick In this case the mechanical bin control should be cleaned WARNING CHOKING HAZARD Ensure all components fasteners and thumbscrews are securely in place after the unit is serviced Make sure that none have fallen into the storage bin 1 Turn off the power supply 2 Remove the front panel and base cover then move the control switch to the OFF position 3 Clear any ice away from the mechanical bin control 4 Disconnect the mechanical bin control switch connector then remove the mechanical bin control assembly from the unit 5 Remove the actuator paddle from the switch mount See Fig 1 6 Wipe down the mechanical bin control assembly with a mixture of 1 part of recommended cleaner Hoshizaki Scale Away or LIME A WAY Economics Laboratory Inc and 25 parts of warm water Rinse the parts thoroughly with
69. cooled Spray Tubes Water Supply Inlet Hot Gas Valve Cleaning Valve Junction Boxes Expansion Valves Control Box Control Switch Receiver Tank Float Switch Water Pump Drier Compressor Liquid Line Valve Thermostatic Bin Control Auxiliary Code T 0 U 0 Mechanical Bin Control and Bracket Thermostatic Bin Control Auxiliary Code U 1 and later Bracket amp Bulb Holder Auxiliary Code 1 0 U 0 19 B Sequence of Operation 1 Sequence Cycles and Shutdown a E Control Board Auxiliary Code T 0 U 0 The steps in the sequence are as outlined below When power is supplied CB red POWER OK LED comes on There is a 5 second delay before startup Note that the order of the component LEDs from the outer edge of CB is 1 4 3 2 1 1 Minute Fill Cycle LED 4 is on WV energizes and the 1 minute fill cycle begins After 1 minute CB checks for a closed F S If F S is closed the harvest cycle begins If not WV remains energized through additional 1 minute fill cycles until water fills the tank and closes F S This serves as a low water safety to protect PM 2 Initial Harvest Cycle LEDs 1 4 and 2 are on WV remains energized Comp FMR HGV 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 re
70. do 8 2 AM yo uo S 4 295 6 Jaye 895012 S 4 x 0 5 4 lt l v 8 1694 095 09400 dnuejs jeniu lt ree 1011 duing 1S AHEH lonuoo ul z 8 L uouws dip rS J041u09 13 11 uiu c 1041009 ui uru e 1 u oS gt youms dip 95 oes 07 01 40 89849 94 ueu 099 Z JO 64 09 ul 8 4 90018 40 0 1 duing e 9 s gums 1 01 6 uols dip yS O dip rS 1 Bumes Jaw 92994 uun 92994 WNWIXEN 160000 SIU uo Z UOUMS dip rs LSNraVv LON 10 19S 101354 e Ulul 2 WNWIUIN e OQ HOUS 51 Jensyoiym Z Olma dip vs 295 09 9243 il 9543 1no duing 1 9123 929944 7 0 nutu iseveu jo eu 10 utu AM lnuIlN L l 50315 9123 1S9AJEH Z S HHIN LO6 NDY HMNLO6 NDM HVINL06 IN3M HEU mo y eouenbes p eog 2 9 25 C Control Board A Hoshizaki exclusive solid state control board is employed in KM 901MAH KM 901MWH and KM 901MRH 3 Modular Crescent Cubers All models are pretested and factory set CAUTION 1 The control board is 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 t
71. e 1 Bulb loose 1 Secure bulb 2 Operating erratically 2 Check and replace i Control Board 1 Defective 1 See IV B Control Board Check 2 All ice formed on a Evaporator 1 Scaled up evaporator does not 2 Damaged 2 Replace 7 b Ambient and or Water 1 cool 1 Increase temperature Temperature c VVater Supply Line 1 VVater pressure too 1 Check and get low recommended pressure d Water System 1 Water supply line 1 Increase water line size too small requires 3 8 OD line dedicated per machine 2 Water filter clogged or 2 Replace filter or install a flow rate too small higher flow rate filter e Inlet Water Valve 1 Dirty mesh filter or 1 Clean orifice 2 Diaphragm does not 12 Check for water leaks with close icemaker off 0 Spray Tubes 2 Out of position 2 Place in position g Thermistor 1 Disconnected loose 11 Connect secure check or defective See V L Removal and Replacement of Thermistor h Hot Gas Valve 1 Coil winding open 1 Replace 2 Plunger does not 2 Replace move 3 VViring to hot gas 3 Check for loose valve connection or open and replace i Expansion Valve 1 Bulb loose 1 Secure bulb 2 Operating erratically 12 Check and replace Liquid Line Valve 1 Continues to open in 11 Check operation in harvest if applicable harvest cycle cycle and replace Control Board 1 Harvest timer is set 1 Adjust longer referring to
72. e 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 3 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 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 3 Evacuation and Recharge R 404A 1 Attach a vacuum pump to the system Be sure to connect the charging hoses to both high and low side access 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 Never allow the oil in the vacuum pump to flow backwards 3 Allow the vacuum pump to pull down to a 29 9 Hg vacuum Evacuating period depends on pump capacity 69 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 air cooled and
73. enser CAUTION 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 2 3 4 5 6 Turn off the power supply Remove the icemaker panels Recover the refrigerant and store it in an approved container Remove the condenser unit panels Disconnect the condenser inlet and outlet piping wa a Remove the screvvs securing the condenser to the base of the unit then remove the condenser 7 Remove the shroud from the condenser and attach to the nevv condenser 8 Install the new condenser 9 Remove the drier located in the icemaker then place the new drier in position 10 Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG 11 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 12 Evacuate the system and charge it with refrigerant See the rating label inside the icemaker for the required re
74. ever a setting longer than the factory setting may be advised in cases where the flush provided at 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 Note that the pump out timer S1 dip switch 3 amp 4 acts in place of the harvest timer during cycles with a pump out For details see II C 3 c Pump Out Timer S1 dip switch 3 amp 4 S4 Dip Switch Setting Time Neg seconds or f o ON oF 90 c Pump Out Timer S4 dip switch 3 amp 4 When a pump out is called for the pump motor de energizes after the preceding freeze cycle The pump motor energizes 2 seconds later in the reverse direction taking water from the bottom of the tank and forcing pressure against the check valve seat allowing water to go through the check valve and down the drain At the same time water flows through the small tube to power flush the float switch The pump motor 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 However where water quality is bad and the icemaker needs a longer pump out time the pump out timer can be adjusted The pump out timer control can be
75. frigerant charge 13 Replace the panels in their correct positions 14 Turn on the power supply 76 Removal and Replacement of Water Regulating Valve water cooled model CAUTION 1 Always install a new drier every time the sealed refrigeration system is opened 2 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 3 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 Turn off the power supply 2 Remove the panels 3 Close the condenser water supply line shut off valve If connected to a closed loop water supply also close the condenser return outlet shut off valve 4 Open the condenser water supply line drain valve If connected to a closed loop water supply also open the condenser return outlet drain valve 5 Attach a compressed air or carbon dioxide supply to the condenser water supply line drain valve 6 Open the water regulating valve by using a screwdriver to pry up on the spring retainer underneath the spring While holding the valve open blow out the condenser using the compressed air or carbon dioxide supply until water stops coming out 7 Recover the refrigerant and store it in an approved container co Disconnect the capillary tube at the condenser outlet O
76. he unit before handling or replacing the control board Do not touch the electronic devices on the control board or the back of the control board Do not change wiring and connections Do not misconnect K3 K4 and K5 because the same connector is used for the thermistor mechanical bin control and float switch K4 is not used on E control board models Always replace the whole control board assembly if it goes bad Do not short out power supply to test for voltage 26 1 Control Board Layout a E Control Board Auxiliary Code T 0 U 0 E Control Board OUTPUT TEST Button ALARM RESET Button S4 Dip Switch used to test relays on control board ARREST ooogeioe CUTPUT TEST Freeze Timer LED 5 5 p el x Jh WHITE K3 Connector 5 Harvest Control 5 1 o 5 thermistor 67 228 60 00 60 0 sa Ss pH s alts o 1 Harvest Timer LED 5 g RED K4 Connector Mechanical Bin Control WHITE S not used on units with R52 8 themostatic bin control Alarm Buzzer Microprocessor control board revision
77. igerant Recovery The icemaker unit is provided with refrigerant access valves Using proper refrigerant practices recover the refrigerant from the access valves and store it in an approved container Do not discharge the refrigerant into the atmosphere 68 2 Brazing A WARNING 1 R 4044 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 DO NOT use R 404A as a mixture with pressurized air for leak testing 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 it is important to make connections outside the evaporator case when possible If it is necessary to braze inside the evaporator case use sandpaper to remove the coating from the brazing connections before unbrazing the components CAUTION 1 Always install a new drier every time the sealed refrigeration system is opened 2 Do not replac
78. inutes LLV setting PM HGV The built in safeties shut down the unit and have alarms as listed below No of Beeps 1 High Evaporator Temp Check for harvest problem stuck HGV or relay hot temperature gt 127 F water entering unit stuck HM or shorted thermistor 53 C 2 Harvest Backup Timer Orange H TIMER LED on harvest gt 20 min for two cycles Check for open thermistor HGV not opening TXV or in a row LLV leaking by low charge inefficient Comp or WRV leaking by Freeze Timer Yellow F TIMER LED on freeze gt freeze timer setting for Check for F S stuck closed up WV leaking by HGV two cycles in a row leaking by PM not pumping TXV not feeding properly LLV not opening low charge HM not bypassing or inefficient Comp To reset the above safeties press the ALARM RESET button with the power supply on 7 Lovv Voltage Red LED turns off if voltage protection operates 92Vac 5 or less The control voltage safeties automatically reset when High Voltage voltage is corrected 147Vac 5 or more Legend Comp compressor FM fan motor FMR fan motor remote F S float switch HGV hot gas valve HM headmaster C P R LLV liquid line valve PM pump motor TXV thermostatic expansion valve WRV water regulating valve WV inlet water valve 30 2 G Control Board Auxiliary Code U 1 and Later At startup a 5 second delay occurs while the control board conducts an internal timer check A beep occurs
79. l or dirt buildup 2 Storage Bin and Scoop Wash your hands before removing ice Use the plastic scoop provided bin accessory The storage bin is for ice use only Do not store anything else in the storage bin Clean the scoop and the storage bin liner using a neutral cleaner Rinse thoroughly after cleaning 3 Air Filters air cooled model Plastic mesh air filters remove dirt and dust from the air and keep the condenser from getting clogged As the filters get clogged the icemaker s performance will be reduced Check the filters at least twice a month When they are clogged use warm water and a neutral cleaner to wash the filters 4 Condenser air cooled and remote air cooled models Check the condenser once a year and clean the coil if required by using a brush or vacuum cleaner More frequent cleaning may be required depending on location C Preparing the Icemaker for Long Storage CAUTION 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 seal do not operate the icemaker with the control switch in the WASH position when the water tank is empty When the icemaker 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 icemaker for an extended time or in sub freezing temperatures follow the instructions below
80. lly follow any instructions provided with the bottles of cleaning and sanitizing solution Always wear liquid proof gloves and goggles to prevent the cleaning and sanitizing solutions from coming into contact with skin or eyes TO prevent damage to the water pump seal do not operate the icemaker with the control switch in the WASH position when the water tank is empty IMPORTANT The cleaning valve is opened during cleaning and sanitizing to allow solution flow to the inside of the evaporator It should be closed for all icemaking operation The compressor will not operate unless this valve is completely closed To close the cleaning valve the valve handle should be at a right angle to the valve body To open the cleaning valve the valve handle should be parallel to the valve body CLOSED Normal Icemaking Operation Cleaning and Sanitizing Operation allows solution flow to the inside of the evaporator 83 1 Cleaning Procedure 1 Dilute 16 fl oz 473 ml of the recommended cleaner Hoshizaki Scale Away or LIME A VVAY Economics Laboratory Inc with 3 gal 11 1 of warm water 2 Remove all ice from the evaporator and the storage bin Note To remove cubes on the evaporator turn off the power supply and turn it back on after 3 minutes The harvest cycle starts and the cubes will be removed from the evaporator Disconnect This 3 Turn off the power supply End of Pump Tubing to Drain 4
81. minute short cycle protection timer expires Otherwise at the end of the next harvest cycle E Float Switch The float switch is used to determine that there is sufficient water in the tank after the 1 minute fill cycle and after each harvest cycle The float switch 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 F Thermistor The thermistor is used as a harvest control sensor The thermistor s resistance varies depending on the suction line temperature The control board monitors the resistance to start the harvest timer No adjustment is required G Control Switch The control switch has three positions OFF for power off ICE for icemaking and WASH to activate the water pump when cleaning and sanitizing 36 III Technical Information A Water Circuit and Refrigeration Circuit 1 KM 901MAH air cooled Spray Tubes Inlet Water Valve Condenser HILIIIIILLLLALLLILILLLA ATI 1111111111 LOTTATO C Fan 1422 Water Supply L 15 mam p High Pressure Switch Strainer eel Evaporator Drier Hot Gas alve Thermistor Cleaning Valve Check Valves x 10 A ID Expansion Valves Refrigeration Circuit Check Valve ENENN Water Circuit 37 2 KM 901MWH water cooled Water Regulating
82. nd water cooled models see the nameplate for the required refrigerant charge For remote air cooled models see the rating label inside the icemaker 12 Replace the removed parts in the reverse order of which they were removed 13 Replace the top insulation and the panels in their correct positions 14 Turn on the power supply 73 F Removal and Replacement of Air Cooled Condenser CAUTION 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 Turn off the power supply 2 Remove the panels 3 Recover the refrigerant and store it in an approved container 4 Disconnect the fan motor wiring harness Remove the bolts securing the fan motor assembly to the floor of the machine then remove the assembly 5 Disconnect the condenser inlet and outlet piping 6 Remove the screws securing the condenser assembly then remove the assembly 7 Remove the shroud from the old condenser and attach it to the new condenser 8 Install the new condenser 9 Remove the drier then place the new drier in position 10 Braze all fittings while purging with nitrogen gas flowing at a pressure of 3
83. ntrol Board Check 5 Pump motor will not a Pump Motor 1 Replace in 2 Replace 3 Check for loose connection or open and replace 4 Replace 5 Defective or bound 5 Replace and clean impeller 6 Mechanical seal worn 6 Check and replace out b Control Board 1 Defective 1 See IV B Control Board Check Control Switch 1 Replace 6 Freeze cycle time is a Pump Out Check Valve 1 Leaking by 1 Clean or replace too short b Float Switch 1 Dirty or erratic 1 Clean or replace See IV operation D Float Switch Check and Cleaning Control Board 1 Defective 1 See IV B Control Board Check d VVater System 1 VVater leaks 1 Check connections for water leaks and repair 62 Possible Cause 7 Fan motor will a Fan Motor 1 Motor winding open 11 Replace not start or is not 2 Bearing worn out 2 Replace Operating espi 3 Wiring to fan motor 13 Check for loose connection water cooled model or open and replace 4 Defective capacitor 4 Replace 5 Fan blade bound 5 Check and replace b Control Board 1 Defective 1 See IV B Control Board Check 8 All components a Refrigerant 1 Low charge 1 Check for leaks Recover run but no ice is repair evacuate and produced recharge 2 Air or moisture 2 Recover replace drier trapped evacuate and recharge b Compressor 1 Defective 1 Replace c Hot Gas Valve 1 Continues to open in 1 Check and
84. o a closed loop system also close the condenser return line shut off valve 3 Open the condenser water supply line drain valve If connected to a closed loop system also open the condenser return line drain valve 4 Attach a compressed air or carbon dioxide supply to the condenser water supply line drain valve 5 Open the water regulating valve by using a screwdriver to pry up on the spring retainer underneath the spring While holding the valve open blow out the condenser using the compressed air or carbon dioxide supply until water stops coming out 6 Close the drain valve s 7 Replace the right side panel and front panel in their correct positions Disconnect This End of Pump Tubing to Drain Water Tank Base Cover
85. o the condenser water supply line drain valve 6 Open the water regulating valve by using a screwdriver to pry up on the spring retainer underneath the spring While holding the valve open blow out the condenser using the compressed air or carbon dioxide supply until water stops coming out 7 Recover the refrigerant and store it in an approved container 8 Disconnect the condenser water inlet and outlet piping and the refrigeration inlet and outlet piping at the condenser 9 Remove the old condenser and install the new condenser Remove the drier then place the new drier in position 10 11 Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG 12 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 13 Evacuate the system and charge it with refrigerant See the nameplate for the required refrigerant charge 14 Close the drain valve s Open the condenser water supply line shut off valve If connected to a closed loop water supply also open the condenser return outlet shut off valve 15 Check for water leaks 16 Replace the panels in their correct positions 17 Turn on the power supply 75 H Removal and Replacement of Remote Air Cooled Cond
86. ocal water conditions scale may build up on the float switch Scale on the switch can cause the float to stick In this case the float switch should be cleaned 1 Turn off the power supply 2 Remove the front panel then move the control switch to the OFF position 3 Remove the base cover then disconnect one end of the pump tubing to drain the water tank See Fig 2 After the water tank has drained reconnect the pump tubing 4 Disconnect the vent tube and the flush tube from the top of the float switch then remove the float switch assembly and remove the float switch assembly and remove the rubber boot from the bottom of the float switch assembly See Fig 3 5 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 6 Wipe down the float switch housing shaft float and retainer rod with a mixture of 1 part of recommended cleaner Hoshizaki Scale Away or LIME A WAY Economics Laboratory Inc and 25 parts of warm water Clean the inside of the rubber boot and hose with cleaning solution Rinse the parts thoroughly with clean water 7 Reassemble the float switch assembly and replace it and the rubber boot in their correct positions Reconnect the vent tube and the flush tube 8 Move the control switch to the ICE position 9 Replace the front panel in its correct position H Vent Flush
87. ol switch to the OFF position 3 Remove the control box cover then clear any ice away from the mechanical bin control 4 Disconnect the red connector from the control board RED K4 connector 5 Check for continuity across the wires of the red connector See Fig 1 When the actuator paddle is not engaged the mechanical bin control switch is closed If open check that the white harness connector is secured to the mechanical bin control switch connector and that the actuator paddle is not sticking Clean if necessary See IV C 2 b Mechanical Bin Control Cleaning See Fig 1 If the mechanical bin control switch still reads open replace the mechanical bin control 6 Press the actuator paddle check for continuity across the wires of the red connector When the actuator paddle is engaged the mechanical bin control switch is open If closed check that the actuator paddle is not restricted Clean if necessary See IV C 2 b Mechanical Bin Control Cleaning If the mechanical bin control switch still reads closed replace the mechanical bin control 7 Reconnect the red connector then move the control switch to the ICE position Turn on the power supply 8 Check that the green BC CLOSED LED on the control board is on 9 Allow the unit to cycle on Following the chart below press and hold the actuator paddle The yellow BC OPEN LED should be on and the unit should shut down according to the chart below If it does not replace the
88. on 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 Turn off the power supply 2 Remove the panels and the front and top insulation 3 Recover the refrigerant and store it in an approved container 4 Remove the spray tubes Remove the insulation at the notch where the refrigeration tubing passes through the molded chassis 5 Disconnect the evaporator tubing Note The pipes in the evaporator case are specially coated to resist corrosion Use sandpaper to remove the coating from the brazing connections before unbrazing 6 Remove the pop rivets securing the evaporator then lift out the evaporator 7 Install the new evaporator 8 Remove the drier then place the new drier in position 9 Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG 10 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 11 Evacuate the system and charge it with refrigerant For air cooled a
89. p to 15 seconds into the freeze cycle if activated at the end of the harvest cycle Freeze Cycle 15 seconds after activation if activated at least 15 seconds before the 5 minute short cycle protection timer expires Otherwise at the end of the next harvest cycle Legend CB control board Comp compressor FM fan motor FMR fan motor remote F S float switch HGV hot gas valve LLV liquid line valve MBC mechanical bin control PM pump motor WV inlet water valve 23 2 Sequence Flow Chart Code 1 0 U 0 iary Auxili a E Control Board 312 19 UI AM 40 0 1 duind Nd 04009 1 2 215 0 031 L 886 JOU ADH Uonisod 3 1 l peoeld s 31 58 2 y U UM 12153 JOU y 35 13 10 ejejduoo ae 6012111155 pue 6001 5512 Jaye eA eA Duiueejo eui 9so 2 0N Aiquiesse 2 0 6012 0058 y Jo pisul au pue pis no eui uloq Je o MO Jezniues pue 3021 eui uedo Buiueej eui UHM Ajquiesse yeld oe odene eui JO pisino eu JBAO MO Jeziiues pue 30212 eui pesojo eAjeA Buiueejo 2U UHM 101 0 dund y o perddns si samod Joio UONI uonisod HSVM 94 u ueuM y 50121025 pue 61 2512 pesn sI 31 10002 au uo uonisod HSVM 94L jogseidi 0s duoa UOIHSOd HSYM 94 l SI 1311115 0 1402 99 u uA 032161303 2 YOUMS 1801
90. placement of Control Board 10 11 12 59 F Diagnostic Charts 1 No Ice Production Possible Cause 1 The icemaker will not a Power Supply 1 Off blown fuse or 1 Turn on replace or reset tripped breaker Loose connection 2 Tighten 3 Bad contacts 3 Check for continuity and replace 4 Not within 4 Refer to nameplate and specifications correct b Transformer 115V 1 Voltage tap switch 1 Verify incoming voltage primary 3 phase only does not match move switch to proper incoming voltage setting 2 Coil winding open or 12 Replace shorted c Water Supply 1 Water supply off or 1 Check and get pressure too low recommended pressure d Thermostatic Bin 1 Tripped with bin filled 11 Remove ice Control with ice 2 Ambient temperature 2 Increase ambient too cool temperature 3 Set too warm 3 See IV C 1 Thermostatic Bin Control Check 4 Bulb out of position 14 Place in position 5 Bad contacts 5 Check for continuity and replace e Fuse Control Box 1 Blown 1 Check for short circuit and replace f Control Switch 1 OFF or WASH 1 Move to ICE position position 2 Bad contacts 2 Check for continuity and replace 9 High Pressure Control 1 Bad contacts 1 Check for continuity and replace 2 Dirty air filter or 2 Clean condenser 3 Ambient or condenser 3 Reduce temperature water temperature too warm 4 Refrigerant 4 Recover evacua
91. pressures should follow performance data provided in this manual See III C Performance Data 6 Pump Out Cycle 10 20 second pump out LEDs 1 3 and 2 are on LED 4 is on when S4 dip switch 3 amp 4 are set to 3 off and 4 on Comp and FMR remain energized HGV energizes WV energizes if S4 dip switch 3 off and 4 on LLV and FM de energize PM stops for 2 seconds then reverses for 10 20 seconds depending on pump out timer S4 dip switch 3 amp 4 setting When the pump out timer expires the pump out is complete The pump out frequency control is factory set for every 10th cycle and 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 S4 dip switch 5 amp 6 can be set to have a pump out occur every cycle or every 2 5 or 10 cycles For details see II C 3 d Pump Out Frequency Control S4 dip switch 5 amp 6 Timing of the first pump out is dependent on CB E CB first pump out is after the first freeze cycle G CB first pump out is determined by S4 dip switch 5 amp 6 See the table below E amp G Control Board Settings stPumpOu S4 Dip Switch Settin p Swi OS E Control Board G Control Board No 5 No 6 Frequency After Tat freeze cycle Diagnosis If PM does not reverse check to see if S4 and S5 dip switch settings are in the factory default position Check P
92. ratically k Condenser Water 1 Water regulating valve 1 Adjust or replace See water cooled model set too high V J Adjustment of Water Regulating Valve 2 Condenser water 2 Check and get pressure too low recommended pressure 3 Water temperature out 3 Correct to specification of specification l Liquid Line Valve 1 Erratic sticking 1 Check and replace m Headmaster C P R 11 Bypassing 1 Replace remote condenser unit 65 Problem Possible Cause 1 Freeze cycle time is n Control Board 1 Float switch 1 Check and reconnect long continued connection loose K5 2 Defective 2 See IV B Control Board Check 2 Harvest cycle time is a Water Supply 1 Water temperature too 1 Increase temperature long cold b Thermistor 1 Disconnected loose 1 Connect secure check or defective See V L Removal and Replacement of Thermistor and IV E Thermistor Check c Control Board 1 Not reading 1 Check and replace See thermistor IV E Thermistor Check 2 Sending voltage to 2 Check and replace See liquid line valve if IV B Control Board applicable in harvest Check d Inlet Water Valve 1 Clogged 1 Clean or replace e Evaporator 1 Scaled up 2 Damaged 2 Replace f Hot Gas Valve 1 Does not open or 1 Check and replace opens partially g Expansion Valve 1 Wide open in harvest 1 Check and replace 2 Bulb loose 2 Secure bulb h Water Reg
93. rol switch opens and shuts down the icemaker even if the ice storage bin is empty When the thermostat is set in the prohibited range the icemaker operates continuously even if the ice storage bin is filled with ice Setting in the prohibited range may result in severe damage to the icemaker The thermostatic bin control is factory set and generally no adjustment is required However adjustment may be needed in some conditions particularly at higher altitude locations 1 Turn off the power supply 2 Remove the front panel then remove the control box cover 3 Disconnect the thermostatic bin control wires from the thermostatic bin control switch 4 Clear any ice away from the thermostatic bulb then hold your hand around the thermostatic bulb to warm it up 5 Check for continuity across the thermostatic bin control switch If closed continue to step 6 If open adjust or replace the thermostatic bin control 6 With the multimeter test leads still in place hold ice on the thermostatic bulb to lower the temperature Within 10 seconds the thermostatic bin control switch should open no continuity If it remains closed adjust or replace the thermostatic bin control 54 2 Mechanical Bin Control Check and Cleaning Auxiliary Code U 1 and Later a Mechanical Bin Control Check To check the mechanical bin control switch follow the steps below 1 Turn off the power supply 2 Remove the front panel then move the contr
94. set to pump out for 10 or 20 seconds 54 Dip Switch Setting Time seconds Nos Noa Tt T2 Valve T1 Time to drain the water tank T2 Harvest timer at pump out d Pump Out Frequency Control S4 dip switch 5 amp 6 The pump out frequency control is factory set to drain the water tank every 10 cycles and 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 2 5 or 10 cycles Timing of the first pump out is dependent on the control board E control board first pump out is after the first freeze cycle G control board first pump out is dependent on S4 dip switch 5 amp 6 See the table below E amp G Control Board Settings tstPump Out 4 Dip Switch Settin ip Swi ing Pump Out E Control Board G Control Board Frequency Every cycle After 1st freeze cycle After 2nd freeze cycle Every 2 cycles After 3rd freeze cycle OFF FF ON FF OFF ON 33 e Bin Control Selector Harvest Pump Timer S4 dip switch 7 Depending on the control board S4 dip switch 7 is either a bin control selector or harvest pump timer CAUTION Do not adjust This dip switch must be left in the factory default position or this unit will not operate correctly 1 Bin Control Selector E Control Board Auxiliary Code T 0 U
95. severe damage to the icemaker The thermostatic bin control switch is a temperature controlled switch used to control the level of ice in the bin It is in line with the power supply to the control switch The thermostatic bin control switch shuts down the unit within 10 seconds when ice contacts the thermostatic bulb regardless of the cycle at activation The thermostatic bin control is factory set and generally no adjustment is required However adjustment may be needed in some conditions particularly at higher altitude locations For further details see IV C 1 Thermostatic Bin Control Check 2 Mechanical Bin Control Auxiliary Code U 1 and Later The mechanical bin control is a lever actuated bin control switch used to control the level of ice in the bin The mechanical bin control connects to the control board RED K4 connector When the actuator paddle is not engaged mechanical bin control switch closed control board green BC CLOSED LED on the unit produces ice When the actuator paddle is engaged mechanical bin control switch open control board yellow BC OPEN LED on the unit shuts down as outlined in the table below Cycle at Mechanical Bin Control Activation Fill Cycle 15 seconds after activation Harvest Cycle At the end of the harvest cycle or up to 15 seconds into the freeze cycle if activated at the end of the harvest cycle Freeze Cycle 15 seconds after activation if activated at least 15 seconds before the 5
96. ssasusqasusqkaqaqaaaqaqaqaqanaakuspayapapayqhusqapiqaaan yskayakhuspasquqhyaqanawaku qsna 40 1 Thermostatic Bin Control Auxiliary Code T 0 U 0 40 a KM 901MAH air cooled and KM 901MWH water cooled 40 b KM 901MRH remote air cooled 41 c KM 901MRH43 remote 1 42 2 Mechanical Bin Control Auxiliary Code U 1 and Later 43 a KM 901MAH air cooled and KM 901MWH water cooled 43 b KM 901MRH remote 81 00016601 44 1 remote air cooled 45 C PerforimanieeiDalauu uu POT 46 T KM 901 MAH AIF COOl8A ass 46 2 KM 901MWH water cooled ra 47 3 KM 901MRH remote air cooled 48 4 KM 901MRH3 remote air cooled aa daaa 49 IV 36 1166 015801010515 ssa 50 A 138000516 660016 ba pla 50 B Control Board CROCK e a ae rata Lo 53 C Bin Control DE a NN NOS 54 1 Thermostatic Bin Control Check Auxiliary Code T 0 U O 54 2 Mechanical Bin Control Check and Cleaning Auxiliary Code U 1 and Later
97. switch HGV hot gas valve LLV liquid line valve PM pump motor TBC thermostatic bin control WV inlet water valve b G Control Board Auxiliary Code U 1 and Later The steps in the sequence are as outlined below When power is supplied CB red POWER OK LED and green BC CLOSED LED come on There is a 5 second delay before startup Note that the order of the component LEDs from the outer edge of CB is 1 4 3 2 1 1 Minute Fill Cycle LED 4 is on WV energizes and the 1 minute fill cycle begins After 1 minute CB checks for a closed F S If F S is closed the harvest cycle begins If not WV remains energized through additional 1 minute fill cycles until water fills the tank and closes F S This serves as a low water safety to protect PM 2 Initial Harvest Cycle LEDs 1 4 and2 are on WV remains energized Comp FMR HGV 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 a 3 9 kO signal 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 seconds For details see Il C 3 b Harvest Timer S4 dip switch 1 amp 2 WV is energized during harvest for a maximum of 6 minutes or the length of harvest minus 0 or 50 seconds harvest pump timer S4 dip switch 7 whichever is shorter CAUTION Do not adjust S4 dip switch 7 out of the factor
98. switch 9 amp 10 For details see II C 3 g Freeze Timer S4 dip switch 9 amp 10 The ALARM RESET button on the control board must be pressed with power on to reset either of these safeties c High Temperature Safety The temperature of the suction line in the refrigeration circuit is limited by the high temperature safety This protects the unit from excessively high temperatures If the evaporator temperature reaches 127 F 7 F 53 C 4 C the control board reads a 8 kO signal from the thermistor and shuts down the icemaker The control board will signal this problem using 1 beep every 3 seconds The ALARM RESET button on the control board must be pressed with power on to reset the safety d Low Water Safety The control board checks the position of the float switch at the end of the initial 1 minute fill cycle and at the end of each harvest cycle If the float switch is in the up position electrical circuit closed the control board changes to the next cycle If the float switch is in the down position electrical circuit open the control board changes to additional 1 minute fill cycles until water enters the tank and closes the float switch When the float switch closes the control board changes to the next cycle The unit will not start without adequate water in the tank This serves as a low water safety to protect the water pump For water cooled model if the condenser water supply is shut off the unit is protected by
99. te and overcharged recharge 5 Fan not operating 5 See chart 1 7 except water cooled model 6 Refrigerant lines or 6 Recover repair replace components restricted drier evacuate and recharge 7 Condenser water 7 Check and get pressure too low or offf recommended pressure water cooled model 60 start continued shorted open replace Interlock Switch 1 Open position 1 Move to closed position Cleaning Valve 2 Bad contacts 2 Check for continuity and replace k Mechanical Bin Control 1 Movement restricted 11 Check and free 2 Defective 2 See IV C 2 Mechanical Bin Control Check and Cleaning Thermistor Leads shorted or open 1 See IV E Thermistor and high temperature or harvest backup timer safety operates 1 beep or 2 beep alarm m Hot Gas Valve Continues to open 1 Check for hot gas valve in freeze cycle and stuck open and replace freeze timer safety operates 3 beep alarm n Inlet Water Valve Mesh filter or orifice 11 Clean gets clogged and water supply cycle does not finish 2 Coil winding open 2 Replace 3 Wiring to inlet water 13 Check for loose connection valve or open and replace 0 Float Switch 1 Bad contacts 1 Check for continuity and replace 2 Defective switch 2 Clean or replace See IV D Float Switch Check and Cleaning p Control Board 1 Defective or in alarm 1 See IV B Control Board Check 2 Fill
100. testing 14 Evacuate the system and charge it with refrigerant For air cooled and water cooled models see the nameplate for the required refrigerant charge For remote air cooled models see the rating label inside the icemaker 15 Connect the terminals and replace the terminal cover in its correct position On remote air cooled models connect the crankcase heater 16 Replace the panels in their correct positions 17 Turn on the power supply C Removal and Replacement of Expansion Valve Moisture in the refrigeration circuit may exceed drier capacity and freeze up at the expansion valve CAUTION 1 Always install a new drier every time the sealed refrigeration system is opened 2 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 3 When brazing protect the valve body and drier by using wet cloths to prevent the valve body and drier from overheating Do not allow the valve body or drier to exceed 250 F 121 C 1 Turn off the power supply 2 Remove the panels 3 Recover the refrigerant and store it in an approved container 4 Remove the insulation and the expansion valve bulb on the suction line 5 Remove the expansion valve cover and disconnect the expansion valve Place the new expansion valve in position 6 Remove the drier then place the new drier in position 7 Braze
101. the high pressure switch e High Voltage and Low Voltage Cut outs The maximum and minimum allowable supply voltages of this icemaker are limited by the high voltage and low voltage cut outs If miswiring especially on single phase 3 wire models causes excessive voltage 147Vac 5 or more the high voltage cut out shuts down the circuit in 3 seconds and the icemaker automatically stops The control board will signal this problem using 7 beeps every 3 seconds The icemaker also automatically stops in cases of insufficient voltage 92Vac 5 or less The control board will signal this problem using 6 beeps every 3 seconds When the proper supply voltage is resumed the icemaker automatically starts running again 29 f LED Lights and Audible Alarm Safeties 1 E Control Board Auxiliary Code T 0 U 0 At startup a 5 second delay occurs while the control board conducts an internal timer check A beep occurs when power is turned off The red LED indicates proper control voltage and remains on unless a control voltage problem occurs The green LEDs 1 through 4 energize and sequence from initial startup as listed in the table below Note that the order of the LEDs from the outer edge of the control board is 1 4 3 2 For details see II B Sequence of Operation Energized Time LEDs are On 1 3 2 Min 1 Minute Fill 0 0614 1 minute Harvest Cycle Comp FMR VVV 2 minutes 3 to 5 minutes HGV Comp FM FMR PM 30 to 35 m
102. through the check valve and down the drain At the same time water flows through the small tube to power flush F S When the pump out timer expires the pump out is complete The first pump out occurs after the 1st freeze cycle then every 10th cycle thereafter The pump out frequency is factory set and 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 S4 dip switch 5 amp 6 can be set to have a pump out occur every cycle or every 2 5 or 10 cycles For details see II C 3 d Pump Out Frequency Control 54 dip switch 5 amp 6 20 5 Harvest Cycle Same as the initial harvest cycle See II B 1 a 2 Initial Harvest Cycle Note Unit continues to cycle until TBC is satisfied or power is turned off The unit always restarts at the 1 minute fill cycle 6 Shutdown When ice contacts the thermostatic bulb TBC switch open TBC shuts down the unit within 10 seconds TBC is factory set and generally no adjustment is required However adjustment may be needed in some conditions particularly at higher altitude locations CAUTION Do not adjust S4 dip switch 7 out of the factory default position on this model This dip switch must be left in the factory default position or this unit will not operate correctly Legend CB control board Comp compressor FM fan motor FMR fan motor remote F S float
103. too short ILC 3 b Harvest Timer S4 dip switch 1 amp 2 2 Defective 2 See IV B Control Board Check 64 Possible Cause 2 All ice formed on Refrigerant 1 Low charge 1 Check for leaks Recover evaporator does not repair evacuate and fall into bin in harvest recharge cycle continued m Water Regulating Valve 1 Leaking by in harvest 1 Check and replace water cooled model 3 Other a Ice Cube Guide 1 Out of position 1 Place in position b Thermostatic Bin 1 Bulb out of position 11 Place in position Control 2 Bad contacts 2 Check for continuity and replace See IV C 1 Thermostatic Bin Control Check c Mechanical Bin Control 1 Movement restricted 1 Check and free 2 Defective 2 See IV C 2 Mechanical Bin Control Check and Cleaning 3 Low Ice Production Problem Possible Cause 1 Freeze cycle time is ja Inlet Water Valve 1 Diaphragm does not 1 Check for water leaks with long close icemaker off b Float Switch 1 Float switch does not 11 Clean or replace See IV move freely or switch D Float Switch Check and defective Cleaning 5 Evaporator d Spray Tubes 7755 1 RPM too slow f Condenser except 1 Air filter or condenser water cooled model clogged g Refrigerant Charge 1 Low charge 1 Check for leaks Recover repair evacuate and recharge n Hot Gas Vave 1 Opon i Expansion Valve 1 Bulb loose 777 er
104. ttaching the pump motor assembly to the base then remove the pump motor assembly 8 Remove the screw attaching the pump motor to the pump motor bracket 9 Remove the screws attaching the pump housing to the pump motor Remove the housing and check the impeller 10 If the impeller is defective install a new impeller 11 Install the new motor or new parts and replace the removed parts in the reverse order of which they were removed Be sure to reattach the green ground wire 12 Turn on the power supply and check for leaks 13 Replace the base cover in its correct position 14 Replace the front panel in its correct position Disconnect This End of Pump Tubing to Drain Water Tank C Fig 6 Base Cover 81 P Removal and Replacement of Control Board When replacing a control board follow the precautions below CAUTION The control board is 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 unit before handling or replacing the control board Do not touch the electronic devices on the control board or the back of the control board Do not change wiring and connections Do not misconnect K3 K4 and K5 because the same connector is used for the thermistor mechanical bin control and float switch K4 is not used on E control board models
105. ulating Valve 1 Open during harvest 1 Adjust or replace See water cooled model V J Adjustment of Water Regulating Valve i Liquid Line Valve if 1 Open during harvest 1 Check and replace applicable cycle 4 Abnormal Ice Possible Cause 1 Small cubes a Pump Out Check Valve 1 Dirty or worn and 1 Clean or replace leaking by b Ice Cube Guide 1 Out of position 1 Place in position Circulated water falls into bin c Water System 1 Water supply line too 1 Increase water line size small requires 3 8 OD line dedicated per machine 2 Water filter clogged or 2 Replace filter or install a flow rate too small higher flow rate filter d Inlet Water Valve 1 Dirty mesh filter or 1 Clean orifice e Pump Motor 1 RPM too slow 1 See chart 1 5 f Control Board 1 Defective 1 See IV B Control Board Check 66 2 Cloudy or irregular a Evaporator cubes b Water System 1 Water supply line too 1 Increase water line size small requires 3 8 OD line dedicated per machine 2 Water filter clogged or 2 Replace filter or install a flow rate too small higher flow rate filter 3 High hardness or 3 Install a water softener or contains impurities filter o Spray Guide 5 Other Possible Cause 1 icemaker will not stop a Thermostatic Bin 1 Set too cold 1 See IV C 1 Thermostatic when bin is filled with Control Bin Control Check ice 2 Defective 2
106. ult in death serious injury or damage to the unit A WARNING Indicates a hazardous situation which could result in death or serious injury CAUTION Indicates a situation which could result in damage to the unit IMPORTANT Indicates important information about the use and care of the unit A WARNING This icemaker 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 be held responsible for eventual damage caused by improper incorrect and unreasonable use To reduce the risk of death electric shock serious injury or fire follow basic precautions including the following Electrical connection must be hard wired and must meet national state and local electrical code requirements Failure to meet these code requirements could result in death electric shock serious injury fire or severe damage to equipment This unit requires an independent power supply See the nameplate for proper voltage and breaker fuse size Failure to use a proper breaker or fuse can result in a tripped breaker blown fuse or damage to existing wiring This could lead to heat generation or fire THIS UNIT MUST BE GROUNDED Failure to properly ground this unit could result in death or serious injury This unit should be disassembled or repaired only by qualified service personnel to reduce the risk of electric shock injury or fire
107. ute Fill Cycle LED 4 is on WV energizes After 1 minute CB checks for a closed F S If F S is closed the harvest cycle begins If closed continue to step 4 If open WV remains energized through additional 1 minute fill cycles until water fills the tank and closes F S low water safety Diagnosis If WV does not open check the supply voltage at WV terminals check continuity on the coil confirm the screen or external filter is not plugged no water flow If unit fails to start harvest check for open F S or bad 1 minute timer in CB See IV D Float Switch Check and Cleaning and IV B Control Board Check 4 Initial Harvest Cycle LEDs 1 4 and 2 are on WV remains energized Comp FMR HGV 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 a 3 9 kO signal 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 seconds For details see II C 3 b Harvest Timer S4 dip switch 1 amp 2 When the harvest timer expires the harvest cycle is complete CB checks the position of F S and proceeds to the next cycle if it is closed or calls for a 1 minute fill cycle if it is open The minimum total time allowed by CB for a complete harvest cycle is 2 minutes E CB WV is energized during harvest for a maximum of 6 minutes or the length of h
108. water cooled models see the nameplate for the required refrigerant charge For remote air cooled models see the rating label inside the icemaker Hoshizaki recommends only virgin refrigerant or reclaimed refrigerant which meets ARI Standard 700 latest edition be used 6 A liquid charge is recommended for charging an R 404A system Invert the service cylinder and place it on 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 Use a throttling valve or liquid dispensing device to add the remaining liquid charge through the low side access valve with the unit running 9 Close the gauge manifold valves and disconnect the gauge manifold hoses 10 Cap the access valves to prevent a possible leak B Removal and Replacement of Compressor CAUTION 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 Note When replacing a compressor with a defective winding be sure to install the new start capacitor and start relay supplied with
109. y default position on this model This dip switch must be left in the factory default position or this unit will not operate correctly For details see II C 3 e Bin Control Selector Harvest Pump Timer S4 dip switch 7 LED 4 goes off when WV de energizes LED 3 comes on and PM energizes and runs for the last 0 or 50 seconds of harvest depending on S4 dip switch 7 setting When the harvest timer expires the harvest cycle is complete CB checks the position of F S and proceeds to the freeze cycle if it is closed or calls for a 1 minute fill cycle if itis open The minimum total time allowed by CB for a complete harvest cycle is 2 minutes 21 3 Freeze Cycle LED 1 is on Comp and FMR remain energized PM FM and LLV energize HGV and WV de energize For the first 5 minutes CB will not accept a signal from F S This minimum 5 minute freeze time is short cycle protection for Comp At the end of 5 minutes F S assumes control As ice builds on the evaporator the water level in the tank lowers The freeze cycle continues until F S opens and terminates the cycle There is a 15 second delay before CB acknowledges an open F S 4 Pump Out Cycle LEDs 1 3 and 2 are on LED 4 is on when S4 dip switch 3 amp 4 are set to 3 off and 4 on Comp and FMR remain energized HGV energizes WV energizes if S4 dip switch 3 off and 4 on LLV and FM de energize PM stops for 2 seconds then reverses taking water from the bottom of the tank and forcing pressure

Hoshizaki KM-901MRH/3 User's Manual

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