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Hoshizaki dcm-75ibah User's Manual

1. Gear Motor B Water Refrigeration Circuit Diagrams 1 DCM 751BAH OS Spout Inlet Water Valve Water Supply is Float Switch mu i VVater Level Reservoir Overflow Drier Thermostatic Expansion Valve la To Drain Drain Valve Gear Motor Dispense Water Valve Air Cooled Condenser High Pressure Switch Y Compressor Refrigeration Circuit uu Water Circuit 10 2 DCM 751BWH OS Spout Inlet Water Valve Water Supply T ils Float Switch Reservoir Water Level Evaporator Overflow Drier Thermostatic Expansion Valve is To Drain Gear Motor Dispense Water Valve Water In H m Water Out lmi O Water Regulating Ws Water Cooled Condenser Valve al High Pressure Switch Compressor Refrigeration Circuit nu Water Circuit 11 lagnosis Il Sequence of Operation and Service pezifieus YANS 19891 104 Z Ul 2 YdIND 2 M ses 1 2 AG 2 IND p zi5 U p W4 you a 5918111 1 10 41 01 2 1 dwog YOUMS eoj 647 joajo1d Jo ow ie B diy AOQE l Q III I 1 O 100w 15 IND s inulul G r youms dip LS euondo y1e soy 9 Qaes Jajem m
2. 33 A A A OU 33 z UUL7 B HO ia 34 B LED Lights and Audible Alarm Safefles aaa accion 35 Celine and d slinenib a a a ici 36 Aa Dip Switch STING S LLL ba m a B s d Abaran k sa y papasaymalaq s sak mus pns 36 2 Infrared Sensor Shutdown Delay S1 dip switch 1 2 3 36 3 Drain Frequency Control S1 dip switch 36 4 Continuous Dispensing Timer 51 dip Switch 5 amp 6 37 5 Bin Control Selector S1 dip switch 7 rss ea 37 6 Bin Control Shutdown Delay S1 dip switch 8 37 7 Factory Use S1 Dip Switch 9 amp TO secarinerorintonans lira 37 D Power Switch Control Switch and Dispense Mode Switch 38 IV Removal and Replacement of Components 40 A Service tor Retigerant LOS ose 40 1 Retrigerant ECOS src d 41 2 Bra ihg ar ia 41 3 Evacuation and Recharge R AOD A icicaniocinnc ii RAR 41 B Important Notes for Component 4 42 C lcemaking UNit essensen A 44 1 Upper Bearing Wear Check unViacia 44 2 Removal and Replacement of Extruding 45 3 Removal and Replacement of Auger Uy adamam amal 45 4 Removal and Replacement of 2
3. 46 5 Removal and Replacement of Mechanical Seal and Lower Housing 47 6 Removal and Replacement of Gear 48 D Dispense COMPONEN uns 49 1 Dispense Auger and 49 2 DISPENSE and Agitating 49 V D HAROE s b citrico 50 VI Preparing the Appliance for Periods of 5 51 A A AA 53 VA Technical IMM al inicias 54 A Specification aaa a iaaa yas 54 L BL aaa 54 2 DCM 751 BAH usos eran IRA taa 55 A A 56 4 DOM 751BWH OS arrasar iio ea sauna 57 Didi E 58 Ree 58 2 000 BI rr 59 C Wiring Diodfams m b aiaa babam danan saya 60 LUCL7 IB aya R ei E e ii 60 2 DCM 751B PROS Mas 61 Important Safety Information Throughout this manual notices appear to bring your attention to situations which could result in death serious injury damage to the appliance or damage to property A WARNING Indicates a hazardous situation which could result in death or serious injury NOTICE Indicates a situation which could result in damage to the appliance or property IMPORTANT Indicates important information about the use and care of the appliance A WARNING The appliance should be destined only to the use for which
4. Red positive El al Multimeter test lead to 7 red K4 connector Black Negative 1477777700 i Control Switch pin closest Test Lead WER to black K3 Red Positive connector Ma A z A PP seg High Pressure Switch HPS LY ee Ho ET Y l m Gear Motor Protect Relay GMPR Terminals 3 and 5 W O Control Board K9 Connector Fig 1 a DRAIN Position on Control Switch CB K9 connector pins 1 and 2 W BK e When control switch is in the ICE position CB K9 connector pin 1 and pin 2 are open 5VDC is present between CB K9 connector pin 1 W BK and pin 2 VV BK If not confirm 5VDC between pin 1 W BK and CB red K4 connector pin closest to CB black K3 connector If 5VDC is not present replace CB e When control switch is in the DRAIN position CB K9 connector pin 1 W BK and pin 2 W Bk are closed 5VDC is present between both CB K9 connector pin 1 W BK and pin 2 W BK to CB red K4 connector pin closest to CB black K3 connector If 5VDC is not present replace CB b High Pressure Switch HPS CB K9 connector pins 3 Y and 4 Y When HPS is closed 5VDC is present between both CB K9 connector pins 3 Y and pin 4 Y to CB red K4 connector pin closest to CB black K3 connector If 5VDC is not present on pin 3 Y or pin 4 Y replace CB If 5VDC is present on CB K9 connector pin 3 Y and not on CB K9 connector pin 4 Y HPS is most likely open CB s
5. 1 Make sure the control switch and the power switch are in the OFF position and that the power supply is off Remove the top apron and left side panels 2 Close the condenser water supply line shut off valve If connected to 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 panels in their correct positions 52 Vil Disposal The appliance contains refrigerant and must be disposed of in accordance with applicable national state and local codes and regulations Refrigerant must be recovered by properly certified service personnel 53 Vill Technical Information A Specification Sheets 1 DCM 751BAH AC SUPPLY VOLTAGE COMPRESSOR GEAR MOTOR FAN MOTOR AGITATING MOTOR DISPENSING MOTOR OTHER MAXIMUM FUSE SIZE MAX HACR BREAKER USA ONLY MAX CIRC BREAKER CANADA ONLY MINIMUM CIRCUIT AMPACITY APPROXIMATE ICE PRODUCTION PER 24 HR lbs day kg day Reference without
6. 90 800 363 800 363 100 Cubelet 90 90 70 F Conductivity 200 us cm 95 Ib 90 70 F 70 50 F 1281 4 77 1274 3 86 82 12 0 96 12 0 517 76 380 47 34 1 16 x 28 1 2 x 48 1 16 865 x 723 x 1221 mm No legs Stainless Steel Galvanized Steel Rear Net 300 Ib 136 kg Shipping 345 Ib 156 kg Permanent Connection Inlet 1 2 FPT Drip Tray Drain Outlet 3 4 FPT Storage Bin Drain Outlet 3 4 FPT Auger Type Direct Driven Auger 1 4 HP Gear Motor Float Switch Push Button Water Regulating Valve Mechanical Bin Control and Timer Hermetic Model RST61C1E CFA 202 Water Cooled Tube in Tube Type Copper Tube on Cylinder Thermostatic Expansion Valve R 404A 1 Ib 6 oz 624 g High 460 PSIG Low 290 PSIG High Voltage Power Protect Relay Auto Reset Internal Protector Auto Reset Internal Protector and Fuse 3A Auto Reset High Pressure Switch Float Switch and Timer Spare Fuse 2 3A Legs HS 5003 Apron kit when drip tray removed Condenser Inlet 1 2 FPT Condenser Outlet 3 8 FPT VOLTAGE RANGE 104 127 VAC 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 56 4 DCM 751BWH OS AC SUPPLY VOLTAGE COMPRESSOR GEAR MOTOR AGITATING MOTOR DISPENSING MOTOR OTHER MAXIMUM FUSE SIZE MAX HACR BREAKER USA ONLY MAX CIRC BREAKER CANADA ONLY
7. MINIMUM CIRCUIT AMPACITY APPROXIMATE ICE PRODUCTION PER 24 HR lb day kg day Reference without marks SHAPE OF ICE ICE HARDNESS FACTOR APPROXIMATE STORAGE CAPACITY ELECTRIC amp WATER CONSUMPTION ELECTRIC W kWH 100 lb POTABLE WATER WATER COOLED CONDENSER gal 24HR gal 100 Ib EXTERIOR DIMENSIONS WxDxH EXTERIOR FINISH WEIGHT CONNECTIONS ELECTRIC WATER SUPPLY DRAIN ICE MAKING SYSTEM HARVESTING SYSTEM ICE MAKING WATER CONTROL DISPENSER CONTROL SYSTEM COOLING WATER CONTROL BIN CONTROL SYSTEM COMPRESSOR CONDENSER EVAPORATOR REFRIGERANT CONTROL REFRIGERANT CHARGE DESIGN PRESSURE P C BOARD CIRCUIT PROTECTION COMPRESSOR PROTECTION GEAR MOTOR PROTECTION REFRIGERANT CIRCUIT PROTECTION LOW WATER PROTECTION ACCESSORIES SUPPLIED OPTIONAL OPERATING CONDITIONS 115 60 1 115V 77 LRA 11 0 RLA 115V 3 0 FLA 1 4 HP 120 V 1 8 FLA TOTAL 110 W TOTAL 115V 0 9 FLA 55 W 115V 0 6A 20A 20A 20A WATER TEMP F 5500801 7 90 800 363 779 353 758 344 738 335 719 326 700 317 681 309 685 311 646 293 100 629 285 612 278 563 255 Cubelet 90 90 70 F Conductivity 200 us cm 95 Ib 90 70 F 70 50 F 1281 4 77 1274 3 86 82 12 0 96 12 0 517 76 380 47 34 1 16 x 28 1 2 x 48 1 16 865 x 723 x 1221 mm No legs Stainless Steel Galvanized Steel Rear Net 300 Ib 136 kg Shipping 345 Ib 156 kg Permanent Connection Inlet
8. Povver Protect Relay Energized Voltage not vvithin specifications Defective 5 Control Transformer Coil winding open or shorted 6 1A 24VAC Fuse Control Box Blown 7 Control Board In alarm See 11 LED Lights and Audible Alarm Safeties See II C Control Board Check Defective 8 Control Switch In DRAIN position Bad contacts Tripped with bin filled with ice 9 Bin Control Proximity switch defective c Actuator paddle does not move freely 10 High Pressure Switch a Control board in 3 or 4 beep alarm See 11 LED Lights and Audible Alarm Safeties 1 Control Board No power to inlet water valve 2 Inlet Water Valve 3 Water Supply 4 Float Switch 5 Drain Valve 1 Control Board No power to gear motor eS ee im 2 Gear Motor a Actuator paddle does not move freely Tv oO om o o 0 4 Mechanical failure 3 Coupling a Defective 4 Gear Motor Protect Relay a Defective Defective Defective 3 Slart Capacitor or Run Capacitor a Defective 4 Compressor External protector b Motor winding c Mechanical failure 5 High Pressure Switch Activates a Dirty condenser Ambient temperature too warm c Fan motor not operating Refrigerant overcharged e Defective Refrigerant lines or components restricted 6 Fan Motor a Capacitor defective b Motor winding c Bearing worn out or locked rotor 7 Evaporator a Dirty Damaged or
9. When BC proximity switch is closed OVDC is read across CB K8 connector pin 3 GY and 4 GY 5VDC is present between CB K8 connector pin 3 GY or 4 GY to CB red K4 connector pin closest to CB black K3 black connector 5VDC GND If 5VDC is not present replace CB HPS Diagnosis HPS automatically resets when refrigeration circuit high side pressure is within an acceptable range 5VDC is supplied from CB K9 connector pin 3 Y and back onto CB K9 connector pin 4 Y If 5VDC is not present at CB K9 connector pin 3 Y to CB red K4 connector pin closest to CB black K3 connector 5VDC GND and CB POWER OK LED is on replace CB If refrigerant pressures have returned to an acceptable range and HPS does not close replace HPS If pressures have not equalized and refrigeration circuit high side pressure does not drop recover evacuate and recharge if necessary On air cooled model check that the condenser is not dirty or clogged check for proper FM operation and fan blade for binding On water cooled model check WRV and water flow in and out of condenser Check for refrigeration circuit refrigerant restriction TXV and drier 8 Fill Cycle VVTRIN LED is on WV energizes 90 sec FT starts LFS closes Nothing happens at this time Reservoir continues to fill UFS closes WV de energizes 90 sec FT terminates Diagnosis If the reservoir is empty LFS open WTRIN LED on and WV off check for 24VAC at CB K2 connector pin 8 W BR to a
10. gt 3 to 4 GY Float Svvitch Output 145 BK TT Upper Float Switch 6 R Lower Float Switch 7 DBU _ 1 K7 Connector Signal 2 W Ice OS Sensor Output 3 W BK Portion Ice Dispense Water OS Sensor GND 7 R Water Dispense Signal 5 N Signal 5 W O AM agitating motor Open 5VDC Ground GND Terminals COMP compressor FLUSH drain valve GM gear motor ICE dispense motor WTRDP water dispense valve WTRIN inlet water valve Fig 9b 34 e K6 Connector 8 W Water OS Sensor Output 9 BK B LED Lights and Audible Alarm Safeties The POWER LED indicates proper control voltage and will remain on unless a control voltage problem occurs For further details see Il Sequence of Operation and Service Diagnosis Icemaking Sequence Energized Fill Cycle WTRIN On until UFS closes Alarm sounds after 90 sec Ice Purge Cycle GM FM Freeze Cycle GM WTRIN refill On until UFS Alarm with refill COMP sounds after 90 sec Drain Cycle FLUSH Drain Dv 0 2sec Dispensing Sequence Energized Dispense Mode Switch 5557 Time LEDs are oni continuous Portion Ice Dispense IDS IDM AM energizes 60 sec per Adjustable Activation 6 sec every 12 activation between 0 2 sec sec of cumulative and 20 sec dispense time Dispense Water WTRDP DispWV Valve Activ
11. marks SHAPE OF ICE ICE HARDNESS FACTOR APPROXIMATE STORAGE CAPACITY ELECTRIC amp WATER CONSUMPTION ELECTRIC W KVVH 100 Ibs POTABLE WATER gal 24HR gal 100 Ibs EXTERIOR DIMENSIONS WxDxH EXTERIOR FINISH WEIGHT CONNECTIONS ELECTRIC WATER SUPPLY DRAIN ICE MAKING SYSTEM HARVESTING SYSTEM ICE MAKING WATER CONTROL DISPENSER CONTROL SYSTEM BIN CONTROL SYSTEM COMPRESSOR CONDENSER EVAPORATOR REFRIGERANT CONTROL REFRIGERANT CHARGE DESIGN PRESSURE P C BOARD CIRCUIT PROTECTION COMPRESSOR PROTECTION GEAR MOTOR PROTECTION REFRIGERANT CIRCUIT PROTECTION LOW WATER PROTECTION ACCESSORIES SUPPLIED OPTIONAL OPERATING CONDITIONS 115 60 1 115V 77 LRA 11 0 RLA 115 V 3 0 FLA 1 4 HP 115 V 1 0 FLA 50 W 120 V 1 8 FLA TOTAL 110 W TOTAL 115 V 0 9 FLA 55 W 115V 0 6A 20A 20A 20A 20 A Ambient WATER TEMP F Temp F 50 70 90 70 801 363 757 343 725 329 80 695 315 666 302 639 290 90 612 278 583 265 562 255 100 539 245 517 234 490 222 Cubelet 90 90 70 F Conductivity 200 us cm 95 Ibs 90 70 F 70 50 F 1388 5 94 1292 4 08 70 12 0 96 12 0 34 1 16 x 28 1 2 x 48 1 16 865 x 723 x 1221 mm No legs Stainless Steel Galvanized Steel Rear Net 300 Ibs 136 kg Shipping 345 Ibs 156 kg Permanent Connection Inlet 1 2 FPT Drip Tray Drain Outlet 3 4 FPT Storage Bin Drain Outlet 3 4 FPT Auger Type Direct Driven Aug
12. Agitator R Agitating Motor L 2 EA Dispense Auger Agitating Motor R DISPENSE MODE A PORTION Dispensing Motor V CONTINUOUS Compressor Inlet Water Valve Float Switch Evaporator Assembly Reservoir Thermostatic Expansion Valve Gear Motor Dispense Water Valve Shutter Assembly VVater Regulating Valve ii Water Cooled k Drain Valve Safety Switch Door Spout Cover 3 Ice Making Unit Extruding Head Cubelet Cutter and Upper Bearing a Allen Head Cap Screw _ 27 I Gr Washer 7 x fi 7 1 H JN Extruding Head Heater Auger 7 gt Evaporator Insulation ue A Mechanical Seal Allen Head Screw O Ring E with Washer Housing and 2 Lovver Bearing IN Hex Head Bolt z Sa with Washer
13. Cooled Model Water Cooled Model 412 4 PSIG 384 PSIG 327421 PSIG 284421 PSIG L l OD BR vo WIRE COLOR CODE W R is BK BLACK BR START RELAY BR BROWN ik ji DBU DARK BLUE aos GY GRAY PA RESISTOR d n LBU LIGHT BLUE POWER jou 1 O ORANG SWITCH START CAP 243 292MFD O ORANGE 1 P PINK BR E R mu FAN MOTOR sarety f SHPO d z AIR COOLED AR W WHITE ii ODEL ONLY Y YELLOW W BK WHITE BLACK arm i W BR WHITE BROWN T W BU WHITE BLUE 77 izi W O WHITE ORANGE TH 7 W R WHITE RED m we TI 4 HR vi WO a Je PONER PROTECT Wo 24 l KEY BR RELAY GEAR MOTOR PROTECT RELAY ney ak BR tse if AGITATING TOR wo wo 80 mo woj P Wo ON y Y S Y un VE p NOISE KILLER 1 DBU CONTROL TRANSFORMER xn i Bk Wir Fst UM R LBU E DISPENSE WATER VALVE wo T LBU il WR NOISE KILLER CONTROL SWITCH j gr tM f ce WR WR wr EE WAR WR m T illi pau so KE W BR Allo r Ws DRAN Lad an M ol BR WBK we 4 4 123 22 WBR El A el K3 R T DRAIN VALVE e T5VAC y P peu E CONTA LLER qu O CONTROL BOARD ww a ik a soc E el Ke 81 7 8 il So 16 NOISE KILLER y lege e 2 18 Hu mili DBU R BR L Rl Wik LBU ICE WATER a DISPENSE DISPENSE 181 gg 1810 SWITCH SWITCH BIN CONTROL BK o ig PORTON R Rd BU m D D y Sur 7 UPPER LOWER DISPENSE MODE SWITCH FLOAT SWITCH wo Wio Wo Wid SI DIP SWITCH S1 DIP SWITCH
14. If GM LED is on but GM does not start check for 115VAC from CB K1 connector pin 3 DBU to a neutral W If 115VAC is not present confirm 115VAC from CB K1 connector pin 2 BR toa neutral W If 115VAC is present on CB K1 connector pin 2 BR but not on CB K1 connector pin 3 DBU replace CB 5 Freeze Cycle GM and COMP LED are on 5 minute ice purge timer terminates or press the SERVICE button on CB after the GM LED turns on to bypass ice purge cycle WARNING Risk of electric shock Care should be taken not to touch live terminals After 5 minute ice purge timer terminates COMP LED turns on If not replace CB If COMP LED turns on and Comp does not start check for 115VAC from the CB X1 relay BR and R to a neutral W If 115VAC is present on CB X1 relay BR and not on CB X1 relay R replace CB Legend AM agitating motor BC bin control CB control board Comp compressor CT control transformer DCT drain cycle timer 1 hr DV drain valve DVT drain valve timer 2 sec FM fan motor timer 90 sec low water safety GM gear motor GMPR gear motor protect relay IPT ice purge timer LFS lovver float switch UFS upper float switch VVV inlet water valve 25 D Bin Control Check When the actuator paddle is not engaged BC is closed and the appliance produces ice S1 dip switch 7 must be in the OFF position When ice fills the chute and engages the actuator paddle BC opens and C
15. R in WR r LAR Kiam r WIR Dau o MBR WBK er 1121 N ex Plar o w ini fo o 7 123 gt olu GVAC A il il x P COMP E B RELAY ie au 2 I CONTROL BOA NOISE KILLER Cua 13 CONTROL BOARD Kg Wak TMA Fi El En 184 m L ol K5 y le KT Y fel r 5 VDC 1 r A 2 NOISE KIL os 1738851437 187 UR lo F op 0 WO SW TTEN BK WTR o nail WY WR DBU RIBH GN av n wr BK TED PORTION SWITCH DISPENSE 5 8K VODE lay ra 1081 TE BK UPER LOWER e it Wr FLOAT SWITCH Wo WO Wid SI DIP SWITCH SI DIP SWITCH NO 2 3 4 5 6 1 8 9 10 CM 0S OFF OFF OFF OFF OFF ON OFF ON OFF OFF 1 1 05 High Pressure Switch Air Cooled Model Water Cooled Model 412 PSIG 384 PSIG 327 21 PSIG 284 21 PSIG
16. REFRIGERANT CHARGE DESIGN PRESSURE CONTROL BOARD CIRCUIT PROTECTION COMPRESSOR PROTECTION GEAR MOTOR PROTECTION REFRIGERANT CIRCUIT PROTECTION LOW WATER PROTECTION ACCESSORIES SUPPLIED OPTIONAL OPERATING CONDITIONS 115 60 1 115 V 77 LRA 11 0 RLA 115 V 3 0 FLA 1 4 HP 115 V 1 0 FLA 50 W 120 V 1 8 FLA TOTAL 110 W TOTAL 115 V 0 9 FLA 55 W 115 V 0 6A 20A 20A 20A 20A Ambient WATER TEMP F Temp F 50 70 090 70 801 363 757 343 725 329 80 695 315 666 302 639 290 90 612 278 583 265 562 255 100 539 245 517 234 490 222 Cubelet 90 90 70 F Conductivity 200 us cm 95 Ibs 90 70 F 70 50 F 1388 5 94 1292 4 08 70 12 0 96 12 0 34 1 16 x 28 1 2 x 48 1 16 865 x 723 x 1221 mm No legs Stainless Steel Galvanized Steel Rear Net 300 Ibs 136 kg Shipping 345 Ibs 156 kg Permanent Connection Inlet 1 2 FPT Drip Tray Drain Outlet 3 4 FPT Storage Bin Drain Outlet 3 4 FPT Auger Type Direct Driven Auger 1 4 HP Gear Motor Float Switch Photoelectric Sensor Infrared Mechanical Bin Control and Timer Hermetic Model RST61C1E CFA 202 Air Cooled Fin and Tube Type Copper Tube on Cylinder Thermostatic Expansion Valve R 404A 1 Ib 10 oz 737 g High 460 PSIG Low 290 PSIG High Voltage Power Protect Relay Auto Reset Internal Protector Auto Reset Internal Protector and Fuse 3A Auto Reset High Pressure Switch Float
17. Switch and Timer Spare Fuse 2 3A Legs HS 5002 Apron kit when drip tray removed VOLTAGE RANGE 104 127VAC 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 55 3 DCM 751BWH AC SUPPLY VOLTAGE COMPRESSOR GEAR MOTOR AGITATING MOTOR DISPENSING MOTOR OTHER MAXIMUM FUSE SIZE MAX HACR BREAKER USA ONLY MAX CIRC BREAKER CANADA ONLY MINIMUM CIRCUIT AMPACITY APPROXIMATE ICE PRODUCTION PER 24 HR lb day kg day Reference without marks SHAPE OF ICE ICE HARDNESS FACTOR APPROXIMATE STORAGE CAPACITY ELECTRIC 8 WATER CONSUMPTION ELECTRIC W kWH 100 lb POTABLE WATER WATER COOLED CONDENSER gal 24HR gal 100 Ib EXTERIOR DIMENSIONS WxDxH EXTERIOR FINISH WEIGHT CONNECTIONS ELECTRIC WATER SUPPLY DRAIN ICE MAKING SYSTEM HARVESTING SYSTEM ICE MAKING WATER CONTROL DISPENSER CONTROL SYSTEM COOLING WATER CONTROL BIN CONTROL SYSTEM COMPRESSOR CONDENSER EVAPORATOR REFRIGERANT CONTROL REFRIGERANT CHARGE DESIGN PRESSURE P C BOARD CIRCUIT PROTECTION COMPRESSOR PROTECTION GEAR MOTOR PROTECTION REFRIGERANT CIRCUIT PROTECTION LOW WATER PROTECTION ACCESSORIES SUPPLIED OPTIONAL OPERATING CONDITIONS 115 60 1 115V 77 LRA 11 0 RLA 115 V 3 0 FLA 1 4 HP 120 V 1 8 FLA TOTAL 110 W TOTAL 115 V 0 9 FLA 55 W 115 V 0 6A 20A 20A WATER TEMP F 50 70
18. connector pin 2 BR check wiring connections If no voltage is present at CB K1 connector pin 3 DBU replace CB If 115VAC is present check 115VAC 3A GM fuse GM internal protector GM windings capacitor and GM coupling between auger and GM If GM internal protector is open allow to cool and reset If reset does not occur replace GM If Comp energizes at the same time GM energizes check CB See II C Control Board Check 10 Freeze Cycle COMP and GM LEDs are on 5 min IPT terminates GM continues CB confirms GM operation through GMPR terminal 3 W O and terminal 5 W O Comp and FM energize Ice production begins 4 to 6 min after Comp and FM energize depending on ambient and water temperature conditions Diagnosis 5 min after GM energizes confirm Comp LED turns on and Comp and FM energize If not check that GMPR is energized 115VAC Next check continuity between GMPR terminal 3 W O and terminal 5 W O If open GMPR is de energized or defective If closed and COMP LED is not on replace CB If COMP LED turns on and Comp and FM do not energize confirm 115VAC at CB Comp X1 relay BR to a neutral W If 115VAC is not present check connections If 115VAC is present confirm 115VAC at CB Comp X1 relay R to a neutral W If 115VAC is not present and COMP LED is on replace CB If 115VAC is present check Comp external protector overload allow to cool and reset If reset does not occur replace external prote
19. floor drain e Install the appliance in a location that stays above freezing Normal operating ambient temperature must be within 45 F to 100 F 7 C to 38 C e Do not leave the appliance on during extended periods of non use extended absences or in sub freezing temperatures To properly prepare the appliance for these occasions follow the instructions in V D Preparing the Appliance for Periods of Non Use e Keep ventilation openings in the appliance enclosure or in the built in structure clear of obstruction e Do not place objects on top of the appliance e The storage bin is for ice use only Do not store anything else in the storage bin I Construction and Water Refrigeration Circuit Diagrams A Construction 1 DCM 751BAH OS Control Box Power Switch Agitating Motor L Spout A Inlet Water Valve Evaporator Assembly Reservoir Thermostatic Expansion Valve Gear Motor Air Cooled Condenser Drain Valve 5 Spout B Storage Bin Bin Control Switch Agitator L mi R Dispense Auger Agitating Motor R Dispensing Motor Compressor Float Svvitch Dispense VVater Valve Shutter Assembly Spout Cover Safety Switch Door 2 DCM 751BVVH OS Spout B Storage Bin Bin Control Switch Control Box Agitator L Power Switch
20. it has been expressly conceived Any other use should be considered improper and therefore dangerous The manufacturer cannot be held responsible for injury or damage resulting from improper incorrect and unreasonable use Failure to service and maintain the appliance in accordance with this manual will adversely affect safety performance component life and warranty coverage and may result in costly water damage To reduce the risk of death electric shock serious injury or fire follow basic precautions including the following e Only qualified service technicians should install and service the appliance e The appliance must be installed in accordance with applicable national state and local codes and regulations e Electrical connection must be hard wired and must meet national state and local electrical code requirements Failure to meet these code requirements could result in death electric shock serious injury fire or damage to equipment e The appliance requires an independent power supply of proper capacity See the nameplate for electrical specifications Failure to use an independent power supply of proper capacity can result in a tripped breaker blown fuse damage to existing wiring or component failure This could lead to heat generation or fire THE APPLIANCE MUST BE GROUNDED Failure to properly ground the appliance could result in death serious injury or damage to equipment e To reduce the risk of electric
21. none have fallen into the storage bin e Make sure all food zones in the appliance are clean after service For cleaning procedures see the instruction manual or the maintenance label 1 Ice Production Check To check production prepare a bucket or pan to catch the ice and a set of scales to weigh the ice After the appliance has operated for 10 to 20 minutes catch the ice production for 10 minutes Weigh the ice to establish the batch weight Multiply the batch weight by 144 to calculate 24hr production When confirming production or diagnosing low production see VIII B Performance Data 2 Diagnostic Procedure This diagnostic procedure is a sequence check that allows you to diagnose the electrical system and components Before proceeding check for correct installation proper voltage per unit nameplate and adequate water supply Check that the 24VAC 1A fuse and GM 115VAC 3A fuse are good When checking high voltage 115VAC always choose a neutral W to establish a good neutral connection When checking low voltage 24VAC always choose a neutral LBU from CT to establish a good neutral connection When checking CB DC voltage 5VDC use CB red K4 connector pin closest to CB black K3 connector for DC ground GND CB POWER LED remains on unless power supply is interrupted Check CB using the steps in II C Control Board Check IMPORTANT Appliance will not start unless the safety switch is engaged 1 Turn on the power suppl
22. prevent it from dropping when sliding back the motor See Fig 16 4 Remove the thumbscrews from the horizontal plane of the motor bracket 5 Remove the motor from the bracket 6 Install the new motor 7 Assemble the removed parts in the reverse order of which they were removed r 8 Move the power switch to the ON position then replace the panels in their correct positions Agitator Agitating Motor 9 Turn on the power supply then move the control switch to the ICE position to start the automatic icemaking process Dispense Motor Fig 16 Dispense Auger V Maintenance The maintenance schedule below is a guideline More frequent maintenance may be required depending on water quality the appliance s environment and local sanitation regulations A WARNING e Only qualified service technicians should service the appliance e Move the control switch and power switch to the OFF positions then turn off the power supply before servicing Lockout Tagout to prevent the power supply from being turned back on inadvertently Maintenance Schedule Fequeneyfasa Ye 06060 SSS Every 2 Air Filter nspect VVash vvith vvarm vvater and neutral cleaner if dirty VVeeks Monthly External Water Check for proper pressure and change if necessary Filters Appliance Exterior Wipe down with a clean soft cloth Use a damp cloth containing a neutral cleaner to wipe off oil or dirt build up Clean any chlorine s
23. the same time Evaporator e Install a new drier e Inspect the mechanical seal and O ring prior to installing the new evaporator If worn cracked or scratched the mechanical seal should also be replaced Gear Motor e Install a new gear motor capacitor Extruding Head e Extruding head allen head cap screws with seals are not reusable New allen head cap Bolts screws with seals must be used 42 Evaporator Assembly Evaporator Assembly Power Switch Extruding Head and Upper Bearing DISPENSE MODE A PORTION Safety Switch Evaporator Heater Y CONTINUOUS Washer 2 Not reusable Evaporator Allen Head Cap Screw with Washer m Mechanical Seal Fig 14 Gear Motor 43 C Icemaking Unit 1 Upper Bearing Wear Check To ensure that the bearing inside the extruding head does not exceed the wear tolerance of 02 follow the instructions below See Fig 15 1 Move the control switch to the OFF position then turn off the power supply Remove the front and top panels then move the power switch to the OFF position 2 Remove the storage bin cover Remove spout B then remove spout A and the cutter See Fig 14 02 Round Stock or Pin Gauge 3 Grasp the top of the auger and move the auger towards you then try to insert a 02 round stock or pin gauge in between the back side of the auger shaft and the bearing surface Check several locations around
24. then place it on the scales Open the high side valve on the gauge manifold 7 Allow the system to charge with liquid until the proper charge weight is met 8 If necessary add any remaining charge to the system through the low side NOTICE To prevent compressor damage use a throttling valve or liquid dispensing device to add the remaining liquid charge through the low side service valve with the appliance running 9 Close the high and low side gauge manifold valves then disconnect the gauge manifold hoses 10 Cap the access valves to prevent a possible leak B Important Notes for Component Replacement NOTICE When replacing a component listed below see the notes to help ensure proper operation See Fig 14 Component Nes ___________ Compressor e Install a new drier start capacitor run capacitor and start relay Thermostatic e Install a new drier Expansion Valve e Attach the thermostatic expansion valve bulb to the suction line in the same location as the previous bulb e The bulb should be between the 10 and 2 o clock positions on the tube Secure the bulb with the clamp and holder then insulate it Fan Motor e Install a new fan motor capacitor Evaporator Assembly Components See Fig 14 Upper and e Inspect the upper bearing for wear See IV C 1 Upper Bearing Wear Check Replace if Lower Bearings necessary When replacing the upper bearing it is advised to also change the lower bearing at
25. 1 2 FPT Drip Tray Drain Outlet 3 4 FPT Storage Bin Drain Outlet 3 4 FPT Auger Type Direct Driven Auger 1 4 HP Gear Motor Float Switch Photoelectric Sensor Infrared Water Regulating Valve Mechanical Bin Control and Timer Hermetic Model RST61C1E CFA 202 Water Cooled Tube in Tube Type Copper Tube on Cylinder Thermostatic Expansion Valve R 404A 1 Ib 6 oz 624 g High 460 PSIG Low 290 PSIG High Voltage Power Protect Relay Auto Reset Internal Protector Auto Reset Internal Protector and Fuse 3A Auto reset High Pressure Switch Float Switch and Timer Spare Fuse 2 3A Legs HS 5002 Apron kit when drip tray removed Condenser Inlet 1 2 FPT Condenser Outlet 3 8 FPT VOLTAGE RANGE 104 127 VAC 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 57 B Performance Data 1 DCM 751BAH OS APPROXIMATE Ambient Water Temp F ICE PRODUCTION Temp FJ so 7o PER 24 HR lb day kg day APPROXIMATE ELECTRIC CONSUMPTION watts APPROXIMATE WATER CONSUMPTION PER 24 HR gal day l day EVAPORATOR OUTLET TEMP HEAD PRESSURE PSIG kg em G SUCTION PRESSURE PSIG kg cm G TOTAL HEAT OF REJECTION 9 300 BTU h AT 90 F WT 70 F Note 1 The data not in bold should be used for reference only 2 We reserve the right to make changes in specifications and design
26. 2 beep alarm sounds every 5 seconds Move the control switch out of the DRAIN position to clear the alarm 3 Move the dispense mode switch to the CONTINUOUS position then dispense all of the ice from the storage bin Note Ice dispenses continuously for a maximum of 60 seconds per activation 4 Attach a compressed air or carbon dioxide supply to the icemaker water supply line drain valve 5 While engaging the water dispense switch blow out the water dispense valve using the compressed air or carbon dioxide supply After blowing out the water dispense valve leave the compressed air or carbon dioxide supply flowing Move the control switch to the OFF position pause momentarily then move to the ICE position to open the inlet water valve and briefly blow out the inlet water valve After blowing out the inlet water valve move the control switch to the OFF position 6 Close the icemaker water supply line drain valve 7 Turn off the power supply then remove the front panel and move the power switch to the OFF position 8 Remove the storage bin cover Clean the storage bin liner and the storage bin cover using a neutral cleaner Rinse thoroughly after cleaning Replace the storage bin cover and the front panel in their correct positions Note If your unit has a water cooled condenser leave the front panel off and go to the next section 51 2 On water cooled model only remove the water from the water cooled condenser
27. B shuts down the appliance within 10 seconds NOTICE Do not place S1 dip switch 7 in the ON position For details see III C 1 Default Dip Switch Settings 1 Remove the front and top panels 2 Remove the storage bin cover If necessary dispense ice or remove ice manually so that the BC actuator paddle is not engaged IMPORTANT Appliance will not start unless the safety switch is engaged WARNING Keep hanas hair and loose clothing clear of the agitator rotating inside of the storage bin 3 Move the control switch to the OFF position 4 Move the power switch to the OFF position 5 Turn off the power supply 6 Disconnect BC connector from the back of the control box 7 Check for continuity across BC proximity switch If BC actuator is not engaged and BC proximity switch is open replace BC proximity switch 8 Press and hold BC actuator paddle While BC actuator is engaged check for continuity across BC proximity switch If BC actuator is engaged and BC proximity switch is open replace BC proximity switch 9 Disengage BC actuator paddle 10 Reconnect BC connector Remove the control box cover 11 Turn on the power supply Move the power switch to the ON position 12 Move the control switch to the ICE position 13 Engage the safety switch to start the automatic icemaking process 14 Make sure the GM LED is on There is a delay of at least 5 seconds before the GM LED turns on after
28. Hoshizaki America Inc Cubelet cemaker Dispenser Models DCM 751BAH OS DCM 751BWH OS SERVICE MANUAL A Superior Degree of Reliability www hoshizaki com Number 73184 Issued 8 31 2012 Revised 9 24 2014 A WARNING Only qualified service technicians should install and service the appliance To obtain the name and phone number of your local Hoshizaki Certified Service Representative visit www hoshizaki com No service should be undertaken until the technician has thoroughly read this Service Manual Failure to service and maintain the appliance in accordance with this manual will adversely affect safety performance component life and warranty coverage and may result in costly water damage Proper installation is the responsibility of the installer Product failure or property damage due to improper installation is not covered under warranty Hoshizaki provides this manual primarily to assist qualified service technicians in the service and maintenance of the appliance Should the reader have any questions or concerns which have not been satisfactorily addressed please call send an e mail message or write to the Hoshizaki Technical Support Department for assistance Phone 1 800 233 1940 770 487 2331 Fax 1 800 843 1056 770 487 3360 E mail techsupport hoshizaki com HOSHIZAKI AMERICA INC 618 Highway 74 South Peachtree City GA 30269 Attn Hoshizaki Technical Support Departm
29. Infrared Sensor Defective 3 Control Board No power to water dispense valve Water supply turned off Defective 2 2 _3 Infrared Sensor _ 4 Dispense Mode Switch nunu 6 Ice Dispense Solenoid 7 Shutter Assembiy na 4 VVater Dispense Valve si 2 31 lll Controls and Adjustments e A Hoshizaki exclusive control board is employed in the DCM 751 series e All models are pretested and factory set e For a control board check procedure see Control Board Check NOTICE e Fragile handle very carefully e The control board contains integrated circuits which are susceptible to failure due to static discharge It is especially important to touch the metal part of the appliance when handling or replacing the control board Do not touch the electronic devices on the control board or the back of the control board Do not change wiring and connections Do not misconnect terminals e Do not short out power supply to test for voltage e Always replace the whole control board assembly if it goes bad 32 A Control Board Layout 1 DCM 751B_H Control Switch 1 to 2 W BK ICE Open 5VDC DRAIN Closed 0VDC High Pressure Svvitch 3 to 4 Y Gear Motor Protect Relay Circuit Open 5VDC 5 to 6 W O Closed OVDC Relay De Energized Open 5VDC Relay Energized Closed OVDC K9 Connector e SERVICE Button Ice Purge Cycle Bypass e
30. K8 Connector Transformer 24VAC Input K1 Connector 3 GM DBU 1 WIR TE 2 GM Voltage Input BR Transformer 24VAC Neutral 2 LBU e K2 Connector Drain Valve Mechanical Bin Control 3 to 4 GY 10 W BU Transformer Input 9 W R Float Switch Output 2 A 5 BK 8 l _ Upper Float Switch mee Inlet Water Valve 1 88 W BR SR 5 y 6 R Transformer m TT Lower Float Switch 7 WIR 62 2 A 7 DBU Dispense Water TT z K Valve 6 W O 24VAC Input n m e K7 Connector 2577 AJ j 1 E B E Continuous Ice Dispense Agitating Motor Signal 2 Y 4 O DES E 115VAC Input 5 E a Water Ice Dispense 3 BK 1 mn S Output 3 BR 2 P Signal 5 R 115VAC Input 3 BK gt m VVater Dispense Signal TA 8 DBU AA LED Legend e S1 Dip Switch POWER OK LED AM agitating motor COMP compressor FLUSH drain valve GM gear motor ICE dispense motor WTRDP water dispense valve WTRIN inlet water valve 5VDC Grou
31. NO 2 3 1 5 1 8 10 CM 75 OFF OFF OFF OFF ON ON OFF ON OFF OFF DCM 151B_ 2 DCM 751B_H OS k io w b WIRE CO a BK BLACK BR BR BROWN DBU DARK BLUE aR R GY GRAY 8 SA a LBU LIGHT BLUE POWER es ma T GHT BLU nice START CAP 243 292FD O ORANG SWITCH i P PINK BR SSS R RED 4 FAN MOTOR V VIOLET TU 4 AIR COOLED Mt Wo WHITE MODEL ONLY gt AU Y YELLOW m Fu i W BK WHITE BLACK EWE RENTER i W BR WHITE BROWN E t W BU WHITE BLUE Agen W O WHITE ORANGE l 2 W R WHITE RED 2 BR BR AGITATING MOTOR BK 80 2 280 m AGITATING NOTO wo Wo BK 2 2 BK Men wo Oo N yo DISPENSING MOTOR B ep k ri P 0 3080 m 44 0 m hol LER di te DBU CONTROL TRANSFORMER AAA A 115 120y BR BK il ait TOF IM R LBU 20 0 DISPENSE WATER VALVE Wo E Wie m El
32. ached Secure the auger assembly using new allen head cap screws 8 Replace spout A spout B and the storage bin cover in their correct positions 9 Move the power switch to the ON position then replace the panels in their correct positions 10 Turn on the power supply then move the control switch to the ICE position to start the automatic icemaking process 45 4 Removal and Replacement of Evaporator NOTICE e 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 e 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 Move the control switch to the DRAIN position and drain all of the water from the evaporator 2 After the water has stopped draining move the control switch to the OFF position then turn off the power supply Remove the front and top panels then move the power switch to the OFF position 3 Remove the apron panel then remove the left side panel 4 5 6 Remove the extruding head heater and the allen head cap screws securing the extruding head and discard the allen head cap screws Using the cutter lift out the auger assembly Recover the refrigerant and store it in an approved container Remo
33. allen head cap screws with seals must be used 6 Lift off the extruding head 7 Place the new extruding head in place and tighten down with new allen head cap screws 8 Replace the cutter in its correct position 9 Replace spout A spout B and the storage bin cover in their correct positions 10 Move the power switch to the ON position then replace the panels in their correct positions 11 Turn on the power supply then move the control switch to the ICE position to start the automatic icemaking process 3 Removal and Replacement of Auger 1 Move the control switch to the DRAIN position and drain all of the water from the evaporator 2 After the water has stopped draining move the control switch to the OFF position then turn off the power supply Remove the front and top panels then move the power switch to the OFF position 3 Remove the storage bin cover Remove spout B then remove spout A See Fig 14 4 Remove the apron panel then remove the left side panel 5 Remove the allen head cap screws with seals securing the extruding head and discard Using the cutter lift out the auger assembly 6 Remove the cutter extruding head and upper part of the mechanical seal from the auger and place them on the new auger NOTICE To help prevent water leaks be careful not to damage the surfaces of the O ring or mechanical seal 7 Install the new auger assembly with the upper part of the mechanical seal att
34. alve will not energize unless the safety switch is engaged The appliance is factory set to drain the evaporator and reservoir once every hour for 2 seconds A manual drain is provided when cleaning the appliance by moving the control switch from the ICE position to the DRAIN position A 1 in 12 drain cycle is also available For further details see III C 3 Drain Frequency Control S1 dip switch 4 a Automatic Drain Cycle A drain cycle occurs once every hour for 2 seconds DCT terminates and DVT starts Once DVT terminates DCT resets and DV de energizes DCT resets every time the power supply is turned off and on again Diagnosis Once DCT terminates DV energizes If not check for 24VAC from K2 connector pin 10 W BU to a neutral LBU If 24VAC is not present replace CB If 24VAC is present check for 24VAC at DV If 24VAC is present and DV does not energize check DV solenoid continuity b Manual Drain Move control switch to the OFF position pause momentarily then move to the DRAIN position DV energizes DV continues until control switch is moved to OFF or ICE position or power is turned off Note a Amomentary pause in the OFF position is necessary to de energize the control board when moving the control switch between ICE and DRAIN Otherwise there is a delay of several minutes before the new selection takes effect b If the control switch is left in the DRAIN position for 10 minutes or more a 2 be
35. anels in their correct positions 17 Turn on the power supply then move the control switch to the ICE position to start the automatic icemaking process 48 D Dispense Components 1 Dispense Auger and Agitator 1 Move the control switch to the OFF position then turn off the power supply Remove the front and top panels then move the power switch to the OFF position 2 Remove the storage bin cover 3 Remove the thumbscrews from the vertical plane then loosen the thumbscrews from the horizontal plane of the motor bracket Slide the motor back Note Hold the dispense auger agitator to prevent it from dropping when sliding back the motor See Fig 16 4 Replace the dispense auger agitator with the new one 5 Assemble the removed parts in the reverse order of which they were removed 6 Move the power switch to the ON position then replace the panels in their correct positions 7 Turn on the power supply then move the control switch to the ICE position to start the automatic icemaking process 2 Dispense and Agitating Motors 1 Move the control switch to the OFF position then turn off the power supply Remove the front and top panels then move the power switch to the OFF position 2 Remove the storage bin cover 3 Remove the thumbscrews from the vertical plane then loosen the thumbscrews from the horizontal plane of the motor bracket Slide the motor back Note Hold the dispense auger agitator to
36. ation The built in alarm safeties shut down the appliance No of Beeps 1 Low Water Safety Automatic reset once water supply is restored UFS open gt 90 seconds after WV energized and UFS closes 2 Control Switch Automatic reset once the control switch is In DRAIN position longer than 15 minutes moved to the ICE position High Pressure Switch Automatic reset once pressure drops First and second activation in 1 hour below the high pressure threshold and the high pressure switch closes High Pressure Switch Call for service To avoid possible catastrophic Third activation in 1 hour failure it is recommended to leave the appliance off until this alarm is resolved Manual reset Turn power off and on again WV off 30 minutes since last WV activation POWER OK LED turns off if voltage 92Vac 5 or less protection operates High Voltage The control voltage safeties automatically 147Vac 5 or more reset when voltage is corrected etter onan ttc dose RRL Tn power ot andon again GMPR contacts fail to close Not used on this model Legend AM agitating motors Comp compressor DispWV dispense water valve DV drain valve EH evaporator heater FM fan motor GM gear motor GMPR gear motor protect relay IDM ice dispensing motor IDS ice dispensing shutter solenoid UFS upper float switch VVV inlet water valve 35 C Settings and Adjustments NOTICE Dip switches are factory set Fail
37. ctor ALIH Multimeter Red Positive Test Lead Black Negative i Test Lead Control Board K7 Connector 5 e Water Dispense BK lo a amp 5VDC power Water Dispense W Water Dispense R switch signal VDC GND Fig 4 22 e Ice Dispense Switch Ice Dispense Sensor h Push Button Model ICE and AM LEDs are on Before engaging the ice dispense switch check for the correct VDC from the locations given in the Disengaged column in the table below If the VDC is different than in the table replace CB If the VDC is correct engage the ice dispense switch ICE LED turns on If not confirm position of dispense mode switch and that the portion and continuous VDC matches the Engaged column in the table below If not check the ice dispense switch continuity when engaged closed and the dispense mode switch continuity If dispense switch is open when engaged replace If dispense mode switch is open replace If the VDC matches the Engaged column below and the ICE LED does not turn on replace CB Note AM LED turns on 6 sec for every 12 sec of cumulative dispense time 5VDC CB K7 Connector Pin Wire Color CB VDC Ground Disengaged Engaged Portion Signal 5 R OVDC 5VDC 5VDC Power Supply 3 BR To 7 POSES EDO 5VDC Continuous Signal 2 Y OVDC 5VDC Multimeter Red positive test
38. ctor Check Comp start and run capacitors Comp start relay and Comp windings If FM does not energize check FM run capacitor that the fan blade is not binding and that FM windings are good 11 Refill Low Water Safety COMP GM and WTRIN are on As ice is produced the water level in the reservoir drops UFS opens Nothing happens at this time When LFS opens 90 sec FT starts WV energizes Comp FM and GM continue As water fills the reservoir LFS closes Nothing happens at this time When UFS closes WV de energizes 90 sec FT terminates and 30 min FZT resets This continues until BC shuts down the appliance or power is turned off to the appliance Diagnosis Confirm that the water level has dropped and UFS and LFS are open See II E Float Switch Check and Cleaning Check for dirty or sticking float switches clogged WV screen defective WV coil or DV leaking by If UFS remains open 90 seconds after LFS opens WV energized a 1 beep alarm sounds 90 sec FT This alarm resets automatically once UFS closes Comp and FM de energize GM de energizes 90 sec later WV and alarm continue until UFS closes Note Each time UF S closes 30 minute FZT starts 30 minute FZT resets when UF S closes again If UF S does not close again within 30 minutes CB shuts down the appliance and sounds a 5 beep alarm every 5 seconds See III B LED Lights and Audible Alarm Safeties 12 Drain Cycle FLUSH drain LED is on IMPORTANT Drain v
39. defective 8 Thermostatic Expansion Valve Bulb loose Operating erratically Low 10 Drain Valve 1 Water Supply Off 2 Control Board No power to inlet water valve 3 Float Switch 4 Inlet Water Valve Shutdown 08080 O 1 Bin Control 277 706 30 2 Ice Water Dispensing Ice Dispense Push Button 1 Power Supply a Off blown fuse or tripped breaker 2 Control Board a Ice dispense switch circuit open or no power 5VDC from control board No power 115VAC to ice dispense solenoid ice dispense motor or agitating motor 3 Ice Dispense Switch Defective 4 Dispense Mode Switch Defective 5 Ilce Dispense Motor Motor windings PA Mechanical failure Defective or loose connection Defective 8 Agitating Motor Motor windings 1 Mechanical failure Ice Dispense Opti Serve 1 Power Supply Off blown fuse or tripped breaker 00 2 Control Board a No power to dispense mode switch Dispense mode switch circuit open c No power to ice dispense solenoid ice dispense motor or agitating motor Defective 3 Infrared Sensor 2 4 Dispense Mode Switch 5 Ice Dispense Motor Defective open Motor windings Mechanical failure 6 Ice Dispense Solenoid a Defective or loose connection 7 Shutter Assembly Defective 8 Agitating Motor Motor windings Mechanical failure 1 Power Supply 2 Water Dispense Switch 3 Water Dispense Valve 1 Power Supply 2
40. e PORTION position ice dispenses for the amount of time determined by the ice dispense time setting DISPENSE MODE A PORTION Fig 12 W CONTINUOUS The ice dispense time control is located on the control board The dial indicates dispense time in seconds and is adjustable between 0 6 and 20 seconds When shipped the ice dispense time control is set to the minimum dispense time of 0 6 sec approximately 0 72 oz mo Ice Dispense OR Time Control m O Dz m 2 oe T Cum DE E E E E 80 H E om 00000000 1 s r es HRY 57 O Fig 13 ELACI E HITE BLACK 39 IV Removal and Replacement of Components A WARNING e The appliance should be diagnosed and repaired only by qualified service personnel to reduce the risk of death electric shock serious injury or fire e Move the control switch and the power switch to the OFF position and turn off the power supply before servicing Lockout Tagout to prevent the power supply from being turned back on inadvertently e CHOKING HAZARD Ensure all components fasteners a
41. ent Web Site www hoshizaki com NOTE To expedite assistance all correspondence communication MUST include the following information Model Number Serial Number e Complete and detailed explanation of the problem IMPORTANT This manual should be read carefully before the appliance is serviced Read the warnings and guidelines contained in this manual carefully as they provide essential information for the continued safe use service and maintenance of the appliance Retain this manual for any further reference that may be necessary CONTENTS Important Satety 11 aaa Aaaa aai 5 Construction and Water Refrigeration Circuit Diagrams 7 AE AAA A 7 TIT SAA OS panistas 7 E 71 iussione anaa aR aAa 8 3 lce Making UA rra ii 9 B Water Refrigeration Circuit Diagrams baa 10 DE D BEROL aa odiada 10 816 175 1271 PPP AA 11 Il Sequence of Operation and Service 1 0555 12 A Sequence Of Operation Flow CMAN incaico tada 12 B S rvice DION siria 18 C Control Board CheCK AAA AA 18 L BiM Control A E E a Aa E A EAEN 26 E Float Switch Cheek and Cleanmind sb b aiana 27 E Diagnostic D B aaa n a 29 A A a E 29 2 1c6 Water Baz 31 Ill Controls and o 32 A Control
42. ep alarm sounds every 5 seconds Move the control switch out of the DRAIN position to clear the alarm Diagnosis DV energizes If not check for 24VAC at CB K2 connector pin 10 W BU to a neutral LBU If 24VAC is not present confirm 24VAC power supply to CB K2 connector pin 9 W R to a neutral LBU If 24VAC is present on CB K2 connector pin 9 W R and not on CB K2 connector pin 10 W BU check for 5VDC at CB K9 connector pin 1 W Bk to CB red K4 connector pin closest to CB black K3 connector If 5VDC is not present on CB K9 connector pin 1 VV BK replace CB If 5VDC is present on CB K9 connector pin 1 W BK check for 5VDC at CB K9 connector pin 2 W BK to CB red K4 connector pin closest to CB black K3 connector If 5VDC is not present on pin 2 W BK check continuity of control switch If open place in DRAIN position or replace control switch If 24VAC is present at CB K2 connector pin 10 W BU check for 24VAC at DV If 24VAC is present and DV does not energize check DV solenoid continuity 13 Shutdown Bin fills and ice engages BC actuator paddle 6 to 10 sec shutdown sequence begins Diagnosis Check that BC actuator paddle is activated and not sticking Check BC proximity switch continuity to confirm BC proximity switch is open If BC actuator is engaged and BC proximity switch is closed replace BC proximity switch If BC proximity switch is open and Comp FM and GM do not de energize replace CB See II C C
43. er 1 4 HP Gear Motor Float Switch Push Button Mechanical Bin Control and Timer Hermetic Model RST61C1E CFA 202 Air Cooled Fin and Tube Type Copper Tube on Cylinder Thermostatic Expansion Valve R 404A 1 Ib 10 oz 737 High 460 PSIG Low 290 PSIG High Voltage Power Protect Relay Auto Reset Internal Protector Auto Reset Internal Protector and Fuse 3A Auto Reset High Pressure Switch Float Switch and Timer Spare Fuse 2 3A Legs HS 5003 Apron kit when drip tray removed VOLTAGE RANGE 104 127 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 54 2 DCM 751BAH OS AC SUPPLY VOLTAGE COMPRESSOR GEAR MOTOR FAN MOTOR AGITATING MOTOR DISPENSING MOTOR OTHER MAXIMUM FUSE SIZE MAX HACR BREAKER USA ONLY MAX CIRC BREAKER CANADA ONLY MINIMUM CIRCUIT AMPACITY APPROXIMATE ICE PRODUCTION PER 24 HR lbs day kg day Reference without marks SHAPE OF ICE ICE HARDNESS FACTOR APPROXIMATE STORAGE CAPACITY ELECTRIC amp WATER CONSUMPTION ELECTRIC W KVVH 100 lbs POTABLE WATER gal 24HR gal 100 Ibs EXTERIOR DIMENSIONS WxDxH EXTERIOR FINISH WEIGHT CONNECTIONS ELECTRIC WATER SUPPLY DRAIN ICE MAKING SYSTEM HARVESTING SYSTEM ICE MAKING WATER CONTROL DISPENSER CONTROL SYSTEM BIN CONTROL SYSTEM COMPRESSOR CONDENSER EVAPORATOR REFRIGERANT CONTROL
44. es are open If open continue to step 5 If closed follow the steps in II E 2 Float Switch Cleaning After cleaning the float switches check them again Replace if necessary 5 6 7 8 Replace the FS molex plug on the control box Press and hold the safety switch to start filling the reservoir Once the reservoir is full and GM starts release the safety switch Remove the FS molex plug from the control box and check continuity across FS wires Black BK to red R for the upper float and black BK to dark blue DBU for the lower float They should be closed If open follow the steps in Il E 2 Float Switch Cleaning After cleaning the float switches check them again Replace if necessary e gt 2 Float Switch Cleaning Depending on water conditions scale may build up on FS Scale on the switch can cause the floats to stick In this case FS should be cleaned and checked 1 Remove the front panel and move the control switch to the DRAIN position 2 Press and hold the safety switch to start draining the appliance 3 Allow the water to drain from the reservoir then release the safety switch 5 Remove FS assembly from the reservoir cover See Fig 8 6 Wipe down FS assembly with a mixture of 1 part Hoshizaki Scale Away and 25 parts warm water Rinse the FS assembly thoroughly with clean water 7 While not necessary the floats can be removed from the shaft during cleaning If you remove them note that the b
45. factory setting allows ice to be dispensed continuously on push button models and for a maximum of 60 sec on Opti Serve models S1 Dip Switch Settin 105 aba 7575 5 Bin Control Selector S1 dip svvitch 7 The appliance is factory set for mechanical bin control operation No adiustment is required In the factory default position S1 dip switch 7 in the off position the gear motor delay after the upper float switch closes is 5 seconds WARNING Do not adjust S1 dip switch 7 out of the factory default position This dip switch must be left in the factory default position or the appliance will not operate correctly S1 Dip Switch AAN Bin Control Application Gear Motor Delay No 7 7 OFF Mechanical Bin Conta nfrared Sensor vvith Mechanical Bin Control Backup 6 Bin Control Shutdovvn Delay S1 dip svvitch 8 Factory set for normal operation No adjustment is required The shutdown delay is the time betvveen the mechanical bin control proximity svvitch opening and the control board shutting off the appliance S1 Dip Switch Settin Bin Control 1 g No 8 Shutdown Delay 0 25 Seconds 6 7 Seconds 7 Factory Use S1 Dip Switch 9 amp 10 Factory set for optimum performance Do not adjust 37 D Power Switch Control Switch and Dispense Mode Switch The power switch control switch and dispense mode switch are used to control the operation of the appliance 1 Power Switch WARNING The power switch does not tu
46. g and lower bearing if wear exceeds 3 Years extruding head factory recommendations Replace the mechanical seal if the seal s contact then Yearly Lower Bearing surfaces are worn cracked or scratched and O Ring lower housing Mechanical Seal Evaporator Cylinder Auger 50 VI Preparing the Appliance for Periods of Non Use NOTICE When storing the appliance for an extended time or in sub freezing temperatures follow the instructions below to prevent damage When the appliance is not used for two or three days under normal conditions it is sufficient to only move the control switch to the OFF position When storing the appliance for extended time or in sub freezing temperatures follow the instructions below 1 Remove the ice from the storage bin drain the water system and remove the water from the icemaker water dispenser water supply line 1 Close the icemaker water supply line shut off valve and open the icemaker water supply line drain valve 2 Move the control switch to the OFF position pause momentarily then move to the DRAIN position Allow the water system to drain for 5 minutes Note a A momentary pause in the OFF position is necessary to de energize the control board when moving the control switch between ICE and DRAIN Otherwise there is a delay of several minutes before the new selection takes effect b If the control switch is left in the DRAIN position for 10 minutes or more a
47. he power switch to the ON position then replace the panels in their correct positions 19 Turn on the power supply then move the control switch to the ICE position to start the automatic icemaking process 6 Removal and Replacement of Gear Motor 1 Move the control switch to the DRAIN position and drain all of the water from the evaporator 2 After the water has stopped draining move the control switch to the OFF position then turn off the power supply Remove the front and top panels then move the power switch to the OFF position 3 Remove the storage bin cover Remove spout B then remove spout A See Fig 14 4 5 6 Remove the bolts securing the lower housing to the gear motor Lift the evaporator up slightly Remove the apron panel then remove the left side panel Remove the evaporator bracket 7 Remove the 3 gear motor bolts 8 Disconnect the wiring from the gear motor then remove the gear motor 9 Remove the spline coupling from the old gear motor and attach to the new gear motor 10 11 12 Connect the gear motor wires 13 14 15 Replace spout A spout B and the front cover of the storage bin in their correct positions Place the new gear motor in the drain pan Secure the gear motor Lower the evaporator down and secure it to the gear motor Replace the evaporator bracket in its correct position 16 Move the power switch to the ON position then replace the p
48. lead to red Pr 77 22 Red Positive to black K3 Ta Test Lead 3LIH connector Control Board K7 Connector Ice Dispense Y Ice Dispense R continuous signal portion signal Ice Dispense BR 5VDC power supply Fig 5 23 i Opti Serve Model ICE and AM LEDs are on Before engaging the ice dispense Opti Serve sensor check for the correct VDC from the locations given in the Disengaged column in the table below If the VDC is different than in the table replace CB If the VDC reading is correct engage the Opti Serve sensor ICE LED turns on If not confirm position of dispense mode switch and that the portion and continuous VDC matches the Engaged column in the table below If not check the dispense mode switch continuity If open replace If dispense mode switch is closed portion or continuous replace the Opti Serve sensor If the VDC matches the Engaged column below and the ICE LED does not turn on replace CB Note AM LED turns on 6 sec for every 12 sec of cumulative dispense time 5VDC CB K7 Connector Pin Wire Color CBVDC Ground Disengaged Engaged Povver Supply 3 va 5VDC 5VDC VDC Sensor Ground 1 W R i OVDC OVDC Continuous Signal 2 OVDC 5VDC Portion Signal 5 W O OVDC 5VDC Multimeter ul mil Red positive Ley Red Positive test lead to red Test Lead K4 connector m pin close
49. lue float is on top The floats must be installed with the magnets inside them towards the top of the switch See Fig 8 Installing the floats upside down will affect the timing of FS operation Rinse FS assembly thoroughly with clean water and replace in its original position Replace the front panel in its correct position Move the control switch to the ICE position Turn on the power supply to start the automatic icemaking process 4 Turn off the power supply 8 9 10 11 sr Legend Comp compressor FS float switch GM gear motor 27 Red jaa upper float switch Black BK ae common Dark Blue DBU lower float switch Magnet towards top Upper Float blue Spring Retainer Clip Magnet towards top Lower Float white Plastic Retainer Clip Fig 7 Float Switch Assembly Reservoir Cover b Fig 8 28 F Diagnostic Tables Before consulting the diagnostic tables check for correct installation proper voltage per appliance nameplate and adequate water pressure 10 to 113 PSIG Check control board using the steps in II C Control Board Check 1 No Ice Production No Ice Production Possible Cause 1 Power Supply a Off blown fuse or tripped breaker Loose connection c Not within specifications 2 Power Switch a OFF position Defective Safety switch not engaged Defective 3 Safety Switch o 4
50. mmon BK and CB red K4 connector pin closest to CB black K3 connector at all times If 5VDC is not present replace CB For further float switch diagnostics see II E Float Switch Check and Cleaning Multimeter Red positive test lead to red K4 connector rm pin closest to black K3 gt Red Positive connector Ja Test Lead fi A o Black Negative Y t 4 4 1 Y 2 7 o Test Lead 1918 1 B I i 1 y Control Board K8 Connector y e Bin Control GY Float Switch FS Common BK Upper Float Switch UFS R Fig 2 Lower Float Switch LFS DBU 20 e 5VDC CB K7 Connector See Figs 3 4 5 and 6 e Water Dispense Switch Water Dispense Sensor f Push Button Model VVTRDP LED is on Before engaging the water dispense switch check for the correct VDC from the locations given in the Disengaged column in the table below If the VDC is different than in the table replace CB If the VDC is correct engage the water dispense switch WTRDP LED turns on If not confirm that the water dispense signal VDC matches the Engaged column in the table below If not check the water dispense switch continuity when engaged closed If the water dispense switch is open when engaged replace the water dispense switch If the VDC matches the Engaged column below and the WTRDP LED does
51. n the direction of the refrigerant flow e 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 40 1 Refrigerant Recovery The appliance 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 2 Brazing A WARNING e R 404A itself is not flammable at atmospheric pressure and temperatures up to 176 F 80 C e R 404A itself is not explosive or poisonous However when exposed to high temperatures open flames R 404A can be decomposed to form hydrofluoric acid and carbonyl fluoride both of which are hazardous Do not use silver alloy or copper alloy containing arsenic 1 Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG NOTICE e 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 e 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 t
52. nd GND Terminals e K6 Connector Open Fig 9a 33 2 DCM 751B_H OS K1 Connector 3 GM DBU 2 GM Voltage Input BR e K2 Connector Drain Valve 9 W R Inlet Water Valve _ 8 W BR Transformer Input T gt Valve 6 MET l 7 W R Dispense Water 24VAC Input 5 W R Agitating Mot 4 O 3 BK Dispense Motor 2 P 115VAC Input 3 BK LED Legend A 115VAC Input Y Control Switch 1 to 2 W BK ICE Open 5VDC DRAIN Closed OVDC High Pressure Switch 3 to 4 Y Open 5VDC Closed OVDC Gear Motor Protect Relay Circuit 5 to 6 W O Relay De Energized Open 5VDC Relay Energized Closed OVDC e K9 Connector e SERVICE Button TPL VAS LL 10 W BU NNE I 1 NIT HNL JSI TTM 1 UOT Comes E T m m nMH nI IIIIVIININ UIIIMININI 99 HL loe OS Sensor GND 1 W R 0777 Continuous Ice Dispense o a gt Ice Purge Cycle Bypass K8 Connector Transformer 24VAC Input 1 W R Transformer 24VAC Neutral 2 LBU 5 Mechanical Bin Control a
53. nd thumbscrews are securely in place after the equipment is serviced Make sure that none have fallen into the storage bin e Make sure all food zones in the appliance and storage bin are clean after the appliance is serviced e When replacing evaporator assembly and water circuit components make sure there are no water leaks after the repair is complete A Service for Refrigerant Lines A WARNING e Repairs requiring the refrigeration circuit to be opened must be performed by properly trained and EPA certified service personnel e Always recover the refrigerant and store it in an approved container Do not discharge the refrigerant into the atmosphere e Use an electronic leak detector or soap bubbles to check for leaks Add a trace of refrigerant to the system if using an electronic leak detector and then raise the pressure using nitrogen gas 140 PSIG Do not use R 404A as a mixture with pressurized air for leak testing NOTICE e 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 appliances can absorb moisture quickly Therefore it is important to prevent moisture from entering the system when replacing or servicing parts e 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 i
54. neutral LBU If 24VAC is not present confirm 24VAC power supply at CB K2 connector pin 7 W R to a neutral LBU If 24VAC is not present on CB K2 connector pin 7 W R check wiring connections from CT If 24VAC is present on CB K2 connector pin 7 W R and not on CB K2 connector pin 8 W BR replace CB If 24VAC is present on CB K2 connector pin 8 W BR check for 24VAC at WV solenoid If 24VAC is present replace WV If WV is energized and fill refill exceeds 90 sec FT with no water in the reservoir check for clogged WV screen or DV leaking Note If UFS remains open 90 seconds after LFS opens WV energized a 1 beep alarm sounds 90 sec FT This alarm resets automatically once UFS closes If reservoir is full and overflowing check for open UFS See II E Float Switch Check and Cleaning If WV de energizes and water continues to fill the reservoir replace WV 9 Ice Purge Cycle GM LED is on UFS closes WV de energizes and WTRIN LED turns off 5 sec GM delay timer and 30 min FZT start 5 sec GM delay timer terminates GM and GMPR energize 5 min IPT starts GM runs for 5 min to clear any ice from the evaporator Diagnosis If GM LED is off check that UFS closed If UFS is closed and GM LED does not turn on replace CB If GM LED is on and GM is off confirm 115VAC at CB K1 connector pin 2 BR to neutral W Check for 115VAC at CB K1 connector pin 3 DBU to a neutral W If no voltage is present at CB K1
55. not turn on replace CB 5VDC CB K7 Connector Pin Wire Color CB VDC Ground Disengaged Engaged 5VDC Power Supply 3 BR Red K4 pin closest 5VDC 5VDC Water Dispense Signal 8 DBU To to black K3 OVDC 5VDC Multimeter m 5VDC 3 Red Positive Red positive mi Test Lead 5 test lead to red R Al Black Negative K4 connector Test Lead pin closest y to black K3 el 2 ee E _ Control Board K7 Connector connector oO o L 9 Water Dispense DBU Water Dispense BR switch signal 5VDC power supply Fig 3 21 g Opti Serve Model WTRDP LED is on Before engaging the water dispense Opti Serve sensor check for the correct VDC from the locations given in the Disengaged column in the table below If the VDC is different than in the table replace CB If the VDC is correct engage the Opti Serve sensor WTRDP LED turns on If not confirm that the water dispense signal VDC matches the Engaged column in the table below If not replace the Opti Serve sensor If the VDC matches the Engaged column below and the WTRDP LED does not turn on replace CB 5VDC CB K7 Connector Pin Wire Color CBVDC Ground Disengaged Engaged VDC Sensor Ground Water Dispense Signal 8 W 7 s OVDC 5VDC 5VDC Power Supply 9 BK Red positive test lead to red K4 connector pin closest to black K3 conne
56. o the system if using an electronic leak detector and then raise the pressure using nitrogen gas 140 PSIG WARNING 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 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 4 Close the low side valve and high side valve on the gauge manifold 41 5 Disconnect the gauge manifold hose from the vacuum pump and attach it to a refrigerant service cylinder Remember to loosen the connection and purge the air from the hose See the nameplate inside the appliance for the required refrigerant charge Hoshizaki recommends only virgin refrigerant or reclaimed refrigerant which meets ARI Standard 700 latest edition be used 6 A liquid charge is required for charging an R 404A system to prevent fractionation Place the service cylinder on the scales if the service cylinder is not equipped with a dip tube invert the service cylinder
57. ol aW 11 13 yejsoy Jomeua9 py urea amuin 01 891 z 90 saenu 1a 1 99 ZL UL L JAGUN ai ee A A a de Meee eae NPA UIBIp Aa paBeBuasip soyenjoe 28 urep LO p sol 2g 0921 sjuauoduloo Ily 1055010 00 0 102 lonuoo 14 28 ajpped ioen 28 AOQE l O2 abing 2 O u do 28 009 OL 019 my utg L paramo ana es y J9MBUID9 HO yewa Zz 1181594 8 UMOPiNyS Sues l 99 Z pue S S L Wee 2 YdIND 2 Yd ND p zi s u Yd IND s solo S4M U UM 21 W9 2 W9 21 NO pazibiaua AM 2 WA 2 Al 2 W4 spunos wueje dasq 1 N 21 duoy paziB1aua dwog 21 dwog 14 998 06 1111 2 Hdil 2 AM 2 AM 2 AM pazibiaua HAND 2 AM 2 WD u do san 14 099 06 SHEY 14 pazibraua W9 S YBUlUL 13 06 SEIS 14 pazibigua AM seis Ld paso san u do 541 pazibigue W4 2 Hdill pesoj san poziou AM s nunuo wueje daaq spunos wieje dasq 1 S47 usado san pezibieus duo 21 W9 pasojo 547 Spuo2 s 06 spuosgas 06 spuoxa
58. ontrol Board Check Legend AM agitating motor BC bin control CB control board Comp compressor CT control transformer DCT drain cycle timer 1 hr DV drain valve DVT drain valve timer 2 sec FM fan motor timer 90 sec low water safety FZT freeze timer GM gear motor GMPR gear motor protect relay HPS high pressure switch IPT ice purge timer LFS lower float switch TXV thermostatic expansion valve UFS upper float switch WRV water regulating valve VVV inlet water valve C Control Board Check Before replacing a CB that does not show a visible defect and that you suspect is bad always conduct the following check procedure This procedure will help you verify your diagnosis Before proceeding check for proper voltage per appliance nameplate Check that the 24VAC 1A fuse and 115VAC 3A GM fuse are good e Check the S1 dip switch settings to assure that they are in the factory default position For factory default settings see 11 1 Default Dip Switch Settings 51 dip switch 7 determines bin control application WARNING Do not adjust S1 dip switch 7 out of the factory default position This dip switch must be left in the factory default position or the appliance will not operate correctly e When checking for 115VAC high voltage primary always choose a 115VAC neutral W to establish a good neutral connection e When checking for 24VAC low voltage secondary always choose a 24VAC neut
59. ounds a 3 beep alarm Check HPS continuity If HPS is open and CB is not in alarm replace CB c Gear Motor Protect Relay GMPR CB K9 connector pins 5 W O and 6 W O When GMPR is de energized GMPR terminals 3 and 5 are open and 5VDC is present between CB K9 connector pin 5 W O and CB red K4 connector pin closest to CB black K3 connector If 5VDC is not present replace CB When GMPR is energized GMPR terminals 3 and 5 are closed and 5VDC is present between CB K9 connector pin 5 W O and pin 6 W O to CB red K4 connector pin closest to CB black K3 connector If GM is energized and GMPR terminals 3 amp 5 are open an 8 beep alarm occurs See III B LED Lights and Audible Alarm Safeties e 5VDC CB K8 Connector See Fig 2 5VDC CB K8 Connector Pin Wire Color Bin Control BC 3 GY and 4 GY Float Switch FS Common 5 BK Common Upper Float Switch UFS 6 R Lower Float Switch LFS 7 DBU d Bin Control BC CB K8 connector pins 3 GY and 4 GY When BC is closed calling for ice 5VDC is present between CB K8 connector pin 3 GY and pin 4 GY to CB red K4 connector pin closest to CB black K3 connector If 5VDC is not present on either pin replace CB If 5VDC is present on pin 3 GY and not on pin 4 GY BC is open See II D Bin Control Check e Float Switch FS CB K8 connector pins 5 common BK 6 UFS R and 7 LFS DBU 5VDC is present between CB K8 connector pin 5 co
60. power up After the GM LED turns on press the SERVICE button on CB to bypass the 5 minute compressor delay WARNING Risk of electric shock Care should be taken not to touch live terminals The COMP LED turns on 15 When Comp starts press and hold BC actuator paddle 16 Comp and GM should de energize within 10 seconds Diagnosis If not and BC is found open and the appliance continues to run replace CB 17 Move the power switch to the OFF position and turn off the power supply 18 Move the power switch to the ON position 19 Replace the storage bin cover control box cover top panel and front panel in their correct positions 20 Turn on the power supply to start the automatic icemaking process Legend BC bin control CB control board Comp compressor GM gear motor 26 E Float Switch Check and Cleaning 1 Float Switch Check 1 Remove the front panel and move the control switch to the DRAIN position 2 Press and hold the safety switch to start draining the appliance IMPORTANT Appliance will not start unless the safety switch is engaged 3 Allow the water to drain from the reservoir then release the safety switch Move the control switch to the ICE position 4 Remove the FS molex plug from the control box and check continuity across FS wires Black BK to red R for the upper float and black BK to dark blue DBU for the lower float See Fig 7 With the water reservoir empty the float switch
61. ral LBU to establish a good neutral connection If the appliance is in alarm see III B LED Lights and Audible Alarm Safeties e When checking for 5VDC use CB red K4 connector pin closest to CB black K3 connector for DC ground GND 1 Startup POWER OK LED on Move control switch to ICE position then move power switch to ON position POWER OK LED turns on POWER LED remains on unless power supply is interrupted NOTICE Appliance will not start unless the safety switch is engaged Diagnosis Check that POWER OK LED is on If not check for proper 115VAC supply voltage to CT main breaker or fuse and power switch Next check for proper 24VAC output from CT Next check that 1A fuse is good Check for 24VAC from CB K8 connector pin 1 W R to CB K8 connector pin 2 LBU If 24VAC is present and POWER OK LED is off replace CB 2 5VDC Output Checks There are seven 5VDC circuits on the appliance DRAIN position through control switch high pressure switch HPS gear motor protect relay GMPR bin control BC float switch FS ice dispense switch and water dispense switch e 5VDC CB K9 Connector See Fig 1 5VDC CB K9 Connector Pin Wire Color Component DRAIN Position Through Control Switch 1 W BK and 2 W BK 3 Y and 4 Y 5 W O and 6 W O High Pressure Switch HPS Gear Motor Protect Relay GMPR terminals 3 and 5
62. rn off all power ON supply to the unit 115VAC power supply is present on i n control board K1 connector pin 2 BR and control board v X1 relay BR when the power switch is in the OFF position Fig 10 2 Control Switch The control switch has 3 positions ICE OFF and DRAIN See Fig 11 a ICE When the control switch is in the ICE position 24VAC is directed to control board K8 connector pin 1 24VAC is present between control board K8 connector pins 1 power and pin 2 neutral b OFF When the control switch is in the OFF position 24VAC is broken to control board K8 connector pin 1 c DRAIN When the control switch is in the DRAIN position 24VAC is directed to control board K8 connector pin 1 24VAC is present between control board K8 connector pins 1 power and pin 2 neutral Also a 5VDC circuit is closed on control board K9 connector pins 1 and 2 This energizes an internal relay on the control board which allows 24VAC to the drain valve from control board connector K2 pin 10 CONTROL Fig 11 38 3 Dispense Mode Switch The dispense mode switch has 2 positions CONTINUOUS and PORTION See Fig 12 a CONTINUOUS When the dispense mode switch is in the CONTINUOUS position ice dispenses as follows Push Button Ice dispenses continuously with button engaged OS Ice dispenses for a maximum of 60 seconds per activation b PORTION When the dispense mode switch is in th
63. s 06 A samnuu G WNWIxe wnuuixe sues 5109 Ld a 06 illeri 1 yoaye jou s oq r ng z spunos uuelep d q 1 Mi gt y youms diq LS SUBS WD 2 Joye uonnq 301 35 pue sjesas Wee a P9Ppasoxa 14 S 06 Jnoy Alene spuoses z 40 sezifieua AQ l uresp UrL eu sseud ssed g ol s solo SIN USYM 4 Ayayes MO azealy E Buna 99 Z SJ9 D 111 1 ss y 1 euondo pesay l 42 uq 21 1 e ses eoUeNbas ajo o ulesp ZL Ul 104 ajqeyene si ZL UI e si 999 ule p ul nejep A104098 94 yBnoyyvy SJ9 D Uea ZL Ul L y SO H a132 INOG eya moj4 pieog 104002 V 4 A Sequence of Operation Flow Chart uo 037 AO HAMOd YAMS Ajayeg 391 U YOUMS O4 U0D NO YOUMS 1 MOd dnyeys m B Service Diagnosis A WARNING e The appliance should be diagnosed and repaired only by qualified service personnel to reduce the risk of death electric shock serious injury or fire e Risk of electric shock Use extreme caution and exercise safe electrical practices e Moving parts e g fan blade can crush and cut Keep hands clear e CHOKING HAZARD Ensure all components fasteners and thumbscrews are securely in place after the appliance is serviced Make sure that
64. shock do not touch the power switch or control switch with damp hands e Before servicing move the power switch and control switch to the OFF position then turn off the power supply Lockout Tagout to prevent the power supply from being turned back on inadvertently Do not make any alterations to the appliance Alterations could result in electric shock injury fire or damage to the appliance Do not place fingers or any other objects into the ice discharge opening e The appliance is not intended for use by persons including children with reduced physical sensory or mental capabilities or lack of experience and knowledge unless they have been given supervision or instruction concerning use of the appliance by a person responsible for their safety A WARNING continued e Children should be properly supervised around the appliance e Do not climb stand or hang on the appliance or allow children or animals to do so Serious injury could occur or the appliance could be damaged e Do not use combustible spray or place volatile or flammable substances near the appliance They might catch fire Keep the area around the appliance clean Dirt dust or insects in the appliance could cause harm to individuals or damage to the appliance NOTICE e Follow the instructions in this manual carefully to reduce the risk of costly water damage e n areas where water damage is a concern install in a contained area with a
65. st A q to black K3 Ja ON z connector O ras Black Negative A x Test Lead N 1 vos 1 s 1 s q 1 1 y iz 1 1 1 1 i k Control Board K7 Connector 1 da a 19 5 us Ice Dispense VV R Ice Dispense oi VDC ground portion signal Ice Dispense W Ice Dispense W BK continuous signal 5VDC power supply Fig 6 24 3 Fill Cycle VVTRIN LED is on WTRIN LED turns on only when the reservoir water level is low enough to open LFS Diagnosis Confirm LFS is open If WTRIN LED is off and LFS is open and the control switch is in the ICE position open replace CB If WTRIN LED is on and water is not filling the reservoir check for 24VAC at CB K2 connector between pin 8 W BR and a neutral LBU If the WTRIN LED is on and 24VAC is not present between CB K2 connector pin 8 W BR and neutral LBU confirm 24VAC at CB K2 connector between pin 7 W R and a neutral LBU If 24VAC is present between CB K2 connector pin 7 W R and a neutral LBU and not between CB K2 connector pin 8 W BR and a neutral LBU replace CB 24VAC CB K2 Connector LFS LFS Connector Pin Wire Color To Neutral LBU Open Closed K2 CB input power Pin 7 W R K8 pin 2 LBU 24VAC 24VAC K2 WV power Pin 8 W BR To SP OVAC 24VAC 4 Ice Purge Cycle GM LED is on GM LED turns on once UFS closes reservoir full If UFS is closed and GM LED is off replace CB
66. taining rust colored spots using a non abrasive cleaner Every 6 Icemaker and Clean and sanitize per the cleaning and sanitizing instructions provided in Months Storage Bin the instruction manual or maintenance label on the appliance Evaporator Wipe down with a clean cloth and warm water Dilute 0 82 fl oz 25 ml of a Condensate Drain 5 25 sodium hypochlorite solution chlorine bleach with 1 6 gal 6 0 1 of Pan and Gear warm water Slowly pour one cup of sanitizing solution into the evaporator Motor Drain Pan condensate drain pan Be careful not to overflow the pan This solution will flow down to the gear motor drain pan and out the drain line to sanitize these areas Repeat with a cup of clean water to rinse Icemaker Storage Check to make sure they are clear Bin and Drip Tray Drains Yearly Inlet Water Valve Close the water supply line shut off valve and drain the water system Clean and Drain Valve the inlet water valve screen and clean and inspect the drain valve Inspect the water hoses and clean replace if necessary Condenser Inspect Clean if necessary by using a brush or vacuum cleaner Appliance Inspect for oil spots loose components fasteners and wires Upper Bearing Check for wear using 02 round stock or pin gauge Replace both upper extruding head bearing and lower bearing if wear exceeds factory recommendations See IV C 1 Upper Bearing Wear Check After Upper Bearing Inspect Replace both upper bearin
67. the auger shaft If the gauge goes between the shaft and the bearing at any point or if the bearing is scratched or cracked both the top bearing in the extruding head and the lower bearing in the housing should be replaced Instructions for removing the extruding head and Fig 15 housing are located later in this procedure Note Replacing the bearing requires a bearing press adaptor If one is not available replace the whole extruding head and housing 4 Replace the cutter spout A spout B and the storage bin cover in their correct positions 5 Move the power switch to the ON position then replace the panels in their correct positions 6 Turn on the power supply then move the control switch to the ICE position to start the automatic icemaking process 44 2 Removal and Replacement of Extruding Head 1 Move the control switch to the DRAIN position and drain all of the water from the evaporator 2 After the water has stopped draining move the control switch to the OFF position then turn off the power supply Remove the front and top panels then move the power switch to the OFF position 3 Remove the storage bin cover Remove spout B then remove spout A and the cutter See Fig 14 4 Remove the apron panel then remove the left side panel 5 Remove the allen head cap screws with seals securing the extruding head and discard NOTICE The allen head cap screws with seals are not reusable New
68. uired refrigerant charge 17 Install the new auger assembly with the upper part of the mechanical seal attached Secure the auger assembly using new allen head cap screws 18 Replace the evaporator bracket and reconnect the water hoses 19 Replace spout A spout B and the storage bin cover in their correct positions 20 Move the power switch to the ON position then replace the panels in their correct positions 21 Turn on the power supply then move the control switch to the ICE position to start the automatic icemaking process 5 Removal and Replacement of Mechanical Seal and Lower Housing 5a Mechanical Seal 1 Move the control switch to the DRAIN position and drain all of the water from the evaporator 2 After the water has stopped draining move the control switch to the OFF position then turn off the power supply Remove the front and top panels then move the power switch to the OFF position 3 Remove storage bin cover Remove spout B then remove spout A See Fig 14 4 Remove the apron panel then remove the left side panel 5 Remove the extruding head heater and the allen head cap screws securing the extruding head and discard the allen head cap screws 6 Using the cutter lift out the auger assembly then remove the evaporator bracket 7 The mechanical seal consists of two parts One moves along with the auger and the other is fixed on the lower housing NOTICE If the contact surfaces of these t
69. ure to maintain factory settings may adversely affect performance and warranty coverage For more information contact Hoshizaki Technical Support at 1 800 233 1940 1 Default Dip Switch Settings The S1 dip switch settings are factory set to the following positions pip switchNo 2 3 a s 6 7 ON OFF OFF Normally off factory use Mechanical Bin Control Shutdown Delay Bin Control Selector Continuous Dispensing Timer DCM models only do not adjust on modular appliances Drain Frequency Control Infrared Sensor Shutdown Delay 2 Infrared Sensor Shutdown Delay S1 dip switch 1 2 3 NOTICE Do not adjust Setting not used on this model When dip switch 7 is off 1 2 and 3 are ignored Factory set DCM 751B_H OS does not use an infrared sensor bin control The appliance uses a mechanical bin control for ice level control 3 Drain Frequency Control S1 dip switch 4 The appliance is factory set for optimum performance with the 1 in 1 drain cycle S1 dip switch 4 in the OFF position This setting allows for removal of sediment from the evaporator without interrupting the icemaking process 1 in 12 drain cycle is available S1 Dip Switch Settin Drain Timer Interval Drain Valve Open OFF 1 in 1 ON 1 in 12 11 Hours 45 Minutes 36 4 Continuous Dispensing Timer S1 dip switch 5 amp 6 The dispense mode switch must be in the CONTINUOUS position for this setting to apply The
70. ve the storage bin cover Remove spout B then remove spout A See Fig 14 7 Remove the evaporator bracket and disconnect the water hoses 8 Disconnect the inlet and outlet tubing 9 Remove the allen head cap screws securing the evaporator to the lower housing 10 11 Lift off the evaporator Inspect the mechanical seal and O ring prior to installing the new evaporator The mechanical seal consists of two parts One moves along with the auger and the other is fixed on the lower housing NOTICE If the contact surfaces of these two parts are worn cracked or scratched the mechanical seal may cause water leaks and should be replaced Instructions for removing the mechanical seal and lower housing are located later in this procedure 12 Make sure the lower mechanical seal is in place then place the new evaporator in position Secure the evaporator to the lower housing using the allen head cap screws 13 Remove the drier then place the new drier in position 14 Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG 15 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 46 16 Evacuate the system and charge it with refrigerant See the nameplate for the req
71. without prior notice 58 2 DCM 751BWH OS APPROXIMATE Water Temp F ICE PRODUCTION PER 24 HR 353 lb day kg day APPROXIMATE ELECTRIC CONSUMPTION watts APPROXIMATE WATER CONSUMPTION PER 24 HR N o gal day 4 EVAPORATOR OUTLET TEMP 10 HEAD PRESSURE PSIG kg cm G SUCTION PRESSURE 11 25 PSIG_kg em G 10 ss za 35 24 35 24 WATER FLOW FOR CONDENSER 20gal h AT 90 F WT 70 F HEAT OF REJECTION FROM CONDENSER 8 100 BTU h AT 90 F WT 70 F HEAT OF REJECTION FROM COMPRESSOR 1 300 BTU h AT 90 F WT 70 F HEAT OF REJECTION FROM GEAR MOTOR 700 BTU h AT 90 F WT 70 F Note 1 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 59 1 DCM 751B_H C Wiring Diagrams High Pressure Switch Air
72. wo parts are worn cracked or scratched the mechanical seal may cause water leaks and should be replaced 8 Remove the allen head cap screws securing the evaporator to the lower housing 9 Raise the evaporator up to access the lower housing 10 Remove the mechanical seal from the housing If only replacing the mechanical seal proceed to step 13 NOTICE To help prevent water leaks be careful not to damage the surfaces of the O ring or mechanical seal 5b Lower Housing 11 Remove the O ring and the bolts securing the housing to the gear motor and remove the housing from the gear motor If inspection of the upper bearing inside the extruding head see IV C 1 Upper Bearing Wear Check indicates that it is out of tolerance replace both it and the bearing inside the lower housing Note Replacing the bearing requires a bearing press adaptor If one is not available replace the whole extruding head and housing 12 Install the O ring and mount the lower housing on the gear motor 47 13 Install the lower part of the mechanical seal on the lower housing 14 Lower the evaporator down and secure it to the lower housing 15 Install the auger assembly with the upper part of the mechanical seal attached Secure the auger assembly using new allen head cap screws 16 Replace the evaporator bracket in its correct position 17 Replace spout A spout B and the front cover of the storage bin in their correct positions 18 Move t
73. y Remove the front panel Move the power switch to the ON position then move the control switch to the DRAIN position Engage the safety switch 2 Allow the water system to drain for 5 minutes If water does not drain see step 12 3 Disengage the safety switch then move the control switch to the OFF position 4 Move the power switch to the OFF position 5 Remove the control box cover 6 Engage the safety switch 7 Startup POVVER OK LED is on Move the power switch to the ON position then move the control switch to the ICE position CB POWER OK LED is on POWER OK LED Diagnosis Check that CB POWER LED is on If not check for proper power supply voltage 115VAC input to CT If 115VAC is not present check the breaker power switch and safety switch Next check that the power protect relay is de energized and contacts between terminals 6 BR and 2 BK are closed Check for proper control voltage 24VAC output from CT Next check the 24VAC 1A fuse If open replace Check for 24VAC at CB K8 connector pin 1 W R to CB K8 connector pin 2 LBU If 24VAC is not present at CB K8 connector pin 1 W R but is present at 1A fuse W R check continuity of control switch If open replace If 24VAC is present between CB K8 connector pin 1 W R and pin 2 LBU and POWER OK LED is off replace CB BC Diagnosis Check that the actuator paddle is properly positioned Check for continuity across BC proximity switch

Hoshizaki dcm-75ibah User's Manual

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