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Hoshizaki Hoshizaki America, Inc. Cubelet Icemaker / Dispenser Models DCM-500BAH DCM-500BAH-OS DCM-500BWH DCM-500BWH-OS “A Superior Degree of Reliability” SERVICE MANUAL www.hoshizaki.com ® Number: 73165 Issued: 7-30-2008 IMPORTANT Only qualified service technicians should attempt to install, service, or maintain this icemaker. No service or maintenance should be undertaken until the technician has thoroughly read this Service Manual. Failure to service and maintain the equipment in accordance with this manual may adversely affect safety, performance, and warranty coverage. Hoshizaki provides this manual primarily to assist qualified service technicians in the service and maintenance of the icemaker. Should the reader have any questions or concerns which have not been satisfactorily addressed, please call, write, or send an e-mail message to the Hoshizaki Technical Support Department for assistance. HOSHIZAKI AMERICA, INC. 618 Highway 74 South Peachtree City, GA 30269 Attn: Hoshizaki Technical Support Department Phone: 1-800-233-1940 Technical Service (770) 487-2331 Fax: 1-800-843-1056 (770) 487-3360 E-mail: [email protected] Web Site: www.hoshizaki.com NOTE: To expedite assistance, all correspondence/communication MUST include the following information: • Model Number ________________________ • Serial Number ________________________ • Complete and detailed explanation of the problem. 2 IMPORTANT This manual should be read carefully before the icemaker is serviced or maintenance operations are performed. Only qualified service technicians should install, service, and maintain the icemaker. Read the warnings contained in this booklet carefully as they give important information regarding safety. Please retain this booklet for any further reference that may be necessary. CONTENTS I. Specifications....................................................................................................................... 5 A. Icemaker........................................................................................................................ 5 1. DCM-500BAH........................................................................................................... 5 2. DCM-500BAH-OS.................................................................................................... 6 3. DCM-500BWH.......................................................................................................... 7 4. DCM-500BWH-OS................................................................................................... 8 II. General Information............................................................................................................ 9 A. Construction................................................................................................................... 9 B. Ice Making Unit.............................................................................................................11 C. Sequence of Operation................................................................................................ 12 1. Fill Cycle.................................................................................................................. 12 2. Ice Purge Cycle (60 seconds)................................................................................. 12 3. Freeze Cycle........................................................................................................... 12 4. Drain Cycle............................................................................................................. 12 5. Shutdown................................................................................................................ 12 D. Control Board............................................................................................................... 14 1. Control Board Layout.............................................................................................. 15 a) DCM-500BAH, DCM-500BWH.......................................................................... 15 b) DCM-500BAH-OS, DCM-500BWH-OS............................................................. 16 2. Features.................................................................................................................. 17 3. Controls and Adjustments ...................................................................................... 18 4. Control Board Check Procedure............................................................................. 18 E. Float Switch.................................................................................................................. 20 III. Technical Information....................................................................................................... 21 A. Water Circuit and Refrigeration Circuit......................................................................... 21 B. Wiring Diagrams........................................................................................................... 23 1. DCM-500BAH, DCM-500BWH ............................................................................... 23 2. DCM-500BAH-OS, DCM-500BWH-OS ................................................................. 24 C. Sequence of Electrical Circuit – Ice Making................................................................. 25 1. Fill Cycle ................................................................................................................. 25 2. Ice Purge Cycle ...................................................................................................... 26 3. Freeze Cycle .......................................................................................................... 27 4. 12 Hour Drain Cycle / Drain Switch........................................................................ 28 5. Shutdown................................................................................................................ 29 6. Low Water Safety ................................................................................................... 30 7. High Pressure Switch ............................................................................................. 31 D. Sequence of Electrical Circuit – Dispensing ............................................................... 32 1. Continuous Dispense.............................................................................................. 32 2. Portion Dispense.................................................................................................... 33 3 E. Performance Data........................................................................................................ 34 1. DCM-500BAH(-OS)................................................................................................. 34 2. DCM-500BWH(-OS)............................................................................................... 35 IV. Service Diagnosis............................................................................................................ 36 A. Diagnostic Procedure................................................................................................... 36 B. Ice Production Check................................................................................................... 37 C. Diagnostic Charts........................................................................................................ 38 1. No Ice Production.................................................................................................... 38 2. Low Ice Production................................................................................................. 41 3. Other....................................................................................................................... 42 4. Dispensing.............................................................................................................. 43 5. Opti Serve (OS) Sensors........................................................................................ 44 V. Removal and Replacement of Components..................................................................... 46 A. Service for Refrigerant Lines........................................................................................ 46 1. Refrigerant Recovery.............................................................................................. 46 2. Brazing................................................................................................................... 46 3. Evacuation and Recharge (R-404A)....................................................................... 47 B. Removal and Replacement of Compressor.................................................................. 48 C. Removal and Replacement of Expansion Valve........................................................... 49 D. Removal and Replacement of Evaporator Assembly Components.............................. 50 1. Upper Bearing Wear Check ................................................................................... 51 2. Removal and Replacement of Extruding Head....................................................... 51 3. Removal and Replacement of Auger...................................................................... 52 4. Removal and Replacement of Evaporator.............................................................. 52 5. Removal and Replacement of Mechanical Seal and Lower Housing .................... 54 6. Removal and Replacement of Gear Motor............................................................. 55 E. Removal and Replacement of Self-Contained Air-Cooled Condenser......................... 56 F. Removal and Replacement of Water-Cooled Condenser.............................................. 57 G. Removal and Replacement of Water Regulating Valve ‑ Water‑Cooled Model Only.... 58 H. Adjustment of Water Regulating Valve - Water-Cooled Model Only.............................. 59 I. Removal and Replacement of Fan Motor...................................................................... 59 J. Removal and Replacement of Inlet or Dispensing Water Valve.................................... 60 K. Removal and Replacement of Drain Valve................................................................... 60 L. Removal and Replacement of Dispensing System....................................................... 61 1. Dispensing Auger and Agitator................................................................................ 61 2. Dispensing or Agitating Motor................................................................................. 61 VI. Cleaning and Maintenance.............................................................................................. 63 A. Cleaning and Sanitizing Instructions............................................................................ 63 1. Water System.......................................................................................................... 64 a) Cleaning Solution................................................................................................ 64 b) Cleaning Procedure............................................................................................. 64 c) Sanitizing Solution............................................................................................... 65 d) Sanitizing Procedure - Following Cleaning Procedure ........................................ 65 2. Dispensing Components........................................................................................ 65 a) Cleaning Solution................................................................................................ 65 b) Sanitizing Solution............................................................................................... 65 c) Cleaning and Sanitizing Procedure...................................................................... 65 B. Maintenance................................................................................................................. 67 C. Preparing the Icemaker for Long Storage.................................................................... 68 4 I. Specifications A. Icemaker 1. DCM-500BAH AC SUPPLY VOLTAGE COMPRESSOR GEAR MOTOR FAN MOTOR AGITATING MOTOR DISPENSING MOTOR OTHERS 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 QUALITY APPROXIMATE STORAGE CAPACITY ELECTRIC & WATER CONSUMPTION ELECTRIC W (kWH/100 lbs.) POTABLE WATER gal./24HR (gal./100 lbs.) EXTERIOR DIMENSIONS (WxDxH) EXTERIOR FINISH WEIGHT CONNECTIONS - ELECTRIC - WATER SUPPLY - DRAIN ICE MAKING SYSTEM HARVESTING SYSTEM ICE MAKING WATER CONTROL COOLING WATER CONTROL BIN CONTROL SYSTEM COMPRESSOR CONDENSER EVAPORATOR REFRIGERANT CONTROL REFRIGERANT CHARGE DESIGN PRESSURE P.C. BOARD CIRCUIT PROTECTION COMPRESSOR PROTECTION GEAR MOTOR PROTECTION REFRIGERANT CIRCUIT PROTECTION LOW WATER PROTECTION ACCESSORIES - SUPPLIED - REQUIRED OPERATING CONDITIONS 115/60/1 120 V 7.9 RLA 51 LRA 120 V 2.4 FLA 1/4 HP 120 V 1.0 FLA 50 W 120 V 0.9 FLA 55 W 120 V 0.9 FLA 55 W 120 V 0.2 A 20 A 20 A 20 A 20 A Ambient WATER TEMP. (°F) Temp. (°F) 50 70 90 70 *535 (243) 510 (231) 485 (220) 80 461 (209) 438 (199) 416 (189) 90 396 (179) *385 (175) 358 (162) 100 340 (154) 323 (147) *304 (138) Cubelet (Compressed Flake Ice) Apprx. 90% Ice (90/70° F, CONDUCTIVITY 200 µs/cm) 40 lbs. 90/70°F 70/50°F 1055 (6.6) 985 (4.4) 46 (11.9) 64 (11.9) 26" x 22-1/2" x 40" ( 661 x 571 x 1016 mm) Stainless Steel, Galvanized Steel (Rear) NET 251 lbs. (114 kg), Shipping 276 lbs. (125 kg) Permanent Connection Inlet 1/2" FPT Outlet 3/4" FPT x2 Auger type Direct Driven Auger ( 1/4 HP Gear Motor ) Float Switch N/A Mechanical Bin Control ( Proximity Sw. ) Hermetic, Model RS43C2E-CAA-219 Air-cooled, Fin and tube type Copper Tube on Cylinder Thermostatic Expansion Valve R404A 1 lb 4.1 oz. (570g) High 460 PSIG Low 290 PSIG High Voltage Cut-out Relay Auto-reset Overload Protector Auto-reset Thermal Protector Fuse Auto-reset High Pressure Control Switch Float Switch and Timer Spare Fuse Legs 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. 5 2. DCM-500BAH-OS AC SUPPLY VOLTAGE COMPRESSOR GEAR MOTOR FAN MOTOR AGITATING MOTOR DISPENSING MOTOR OTHERS 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 QUALITY APPROXIMATE STORAGE CAPACITY ELECTRIC & WATER CONSUMPTION ELECTRIC W (kWH/100 lbs.) POTABLE WATER gal./24HR (gal./100 lbs.) EXTERIOR DIMENSIONS (WxDxH) EXTERIOR FINISH WEIGHT CONNECTIONS - ELECTRIC - WATER SUPPLY - DRAIN ICE MAKING SYSTEM HARVESTING SYSTEM ICE MAKING WATER CONTROL COOLING 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 - REQUIRED OPERATING CONDITIONS 115/60/1 120 V 7.9 RLA 51 LRA 120 V 1.6 FLA 1/6 HP 120 V 0.6 FLA 30 W 120 V 0.9 FLA 55 W 120 V 0.9 FLA 55 W 120 V 0.2 A 20 A 20 A 20 A 20 A Ambient WATER TEMP. (°F) Temp. (°F) 50 70 90 70 *525 (238) 510 (231) 485 (220) 80 461 (209) 438 (199) 416 (189) 90 396 (179) *385 (175) 358 (162) 100 340 (154) 323 (147) *304 (138) Cubelet (Compressed Flake Ice) Apprx. 90% Ice (90/70° F, CONDUCTIVITY 200 µs/cm) 40 lbs. 90/70°F 70/50°F 1055 (6.6) 985 (4.4) 46 (11.9) 64 (11.9) 26" x 22-1/2" x 40" ( 661 x 571 x 1016 mm) Stainless Steel, Galvanized Steel (Rear) NET 251 lbs. (114 kg), Shipping 276 lbs. (125 kg) Permanent Connection Inlet 1/2" FPT Outlet 3/4" FPT x2 Auger type Direct Driven Auger ( 1/6 HP Gear Motor ) Float Switch N/A Photoelectric Sensor (Infrared) Mechanical Bin Control ( Proximity Sw. ) Hermetic, Model RS43C2E-CAA-219 Air-cooled, Fin and tube type Copper Tube on Cylinder Thermostatic Expansion Valve R404A 1 lb 4.1 oz. (570g) High 460 PSIG Low 290 PSIG High Voltage Cut-out Relay Auto-reset Overload Protector Auto-reset Thermal Protector Fuse Auto-reset High Pressure Control Switch Float Switch and Timer Spare Fuse Legs 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. 6 3. DCM-500BWH AC SUPPLY VOLTAGE COMPRESSOR GEAR MOTOR AGITATING MOTOR DISPENSING MOTOR OTHERS 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 QUALITY APPROXIMATE STORAGE CAPACITY ELECTRIC & WATER CONSUMPTION ELECTRIC W (kWH/100 lbs.) POTABLE WATER WATER - COOLED CONDENSER gal./24HR (gal./100 lbs.) EXTERIOR DIMENSIONS (WxDxH) EXTERIOR FINISH WEIGHT CONNECTIONS - ELECTRIC - WATER SUPPLY - DRAIN ICE MAKING SYSTEM HARVESTING SYSTEM ICE MAKING WATER CONTROL COOLING WATER CONTROL BIN CONTROL SYSTEM COMPRESSOR CONDENSER EVAPORATOR REFRIGERANT CONTROL REFRIGERANT CHARGE DESIGN PRESSURE P.C. BOARD CIRCUIT PROTECTION COMPRESSOR PROTECTION GEAR MOTOR PROTECTION REFRIGERANT CIRCUIT PROTECTION LOW WATER PROTECTION ACCESSORIES - SUPPLIED - REQUIRED OPERATING CONDITIONS 115/60/1 120 V 7.9 RLA 51 LRA 120 V 2.4 FLA 1/4 HP 120 V 0.9 FLA 55 W 120 V 0.9 FLA 55 W 120 V 0.2 A 20 A 20 A 20 A 20 A Ambient WATER TEMP. (°F) Temp. (°F) 50 70 90 70 * 567 (257) 549 (249) 539 (244) 80 529 (240) 519 (2335) 509 (231) 90 500 (227) * 495 (224) 481 (218) 100 472 (214) 464 (210) * 428 (194) Cubelet (Compressed Flake Ice) Approx. 90% Ice (90/70° F, Conductivity 200 µs/cm) 40 lbs. 90/70°F 70/50°F 967 (4.7) 991 (4.1) 60 (12) 68 (12) 352 (71.2) 251 (44.3) 26" x 22-1/2" x 40" (661 x 571 x 1016 mm) Stainless Steel, Galvanized Steel (Rear) Net 245 lbs. (111 kg), Shipping 269 lbs. (122 kg) Permanent Connection Inlet 1/2" FPT Condenser Inlet 1/2"FPT Outlet 3/4" FPT x2 Condenser Outlet 3/8" FPT Auger type Direct Driven Auger ( 1/4 HP Gear Motor ) Float Switch Automatic Water Regulator Mechanical Bin Control ( Proximity Sw. ) Hermetic, Model RS43C2E-CAA-219 Water Cooled, Double Tube Type Copper Tube on Cylinder Thermostatic Expansion Valve R404A 14.1 oz. (400g) High 460 PSIG Low 290 PSIG High Voltage Cut-out Relay Auto-reset Overload Protector Auto-reset Thermal Protector Fuse Auto-reset High Pressure Control Switch Float Switch and Timer Spare Fuse Legs 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. 7 4. DCM-500BWH-OS AC SUPPLY VOLTAGE COMPRESSOR GEAR MOTOR AGITATING MOTOR DISPENSING MOTOR OTHERS 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 QUALITY APPROXIMATE STORAGE CAPACITY ELECTRIC & WATER CONSUMPTION ELECTRIC W (kWH/100 lbs.) POTABLE WATER WATER - COOLED CONDENSER gal./24HR (gal./100 lbs.) EXTERIOR DIMENSIONS (WxDxH) EXTERIOR FINISH WEIGHT CONNECTIONS - ELECTRIC - WATER SUPPLY - DRAIN ICE MAKING SYSTEM HARVESTING SYSTEM ICE MAKING WATER CONTROL COOLING WATER CONTROL DISPENSE 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 - REQUIRED OPERATING CONDITIONS 115/60/1 120 V 7.9 RLA 51 LRA 120 V 1.6 FLA 1/6 HP 120 V 0.9 FLA 55 W 120 V 0.9 FLA 55 W 120 V 0.2 A 20 A 20 A 20 A 20 A WATER TEMP. (°F) Ambient 50 70 90 Temp. (°F) 70 * 567 257 549 249 539 244 80 529 240 519 235 509 231 90 500 227 * 495 224 481 218 100 472 214 464 210 * 428 194 Cubelet (Compressed Flake Ice) Approx. 89% Ice (90/70° F, CONDUCTIVITY 200 µs/cm) 40 lbs. 70/50°F 90/70°F 985 (4.0) 930 (4.8) 65 (12) 56 (12) 285 (52) 465 (100) 26" x 22-1/2" x 40" (661 x 571 x 1016 mm) Stainless Steel, Galvanized Steel (Rear) Net 245 lbs. (111 kg), Shipping 269 lbs. (122 kg) Permanent Connection Inlet 1/2" FPT Condenser Inlet 1/2"FPT Outlet 3/4" FPT x2 Condenser Outlet 3/8" FPT Auger type Direct Driven Auger ( 1/6 HP Gear Motor ) Float Switch Automatic Water Regulator Photoelectric Sensor (Infrared) Mechanical Bin Control ( Proximity Sw. ) Hermetic, Model RS43C2E-CAA-219 Water Cooled, Double Tube Type Copper Tube on Cylinder Thermostatic Expansion Valve R404A 14.1 oz. (400g) High 460 PSIG Low 290 PSIG High Voltage Cut-out Relay Auto-reset Overload Protector Auto-reset Thermal Protector Fuse Auto-reset High Pressure Control Switch Float Switch and Timer Spare Fuse Legs 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. 8 II. General Information A. Construction 1. DCM-500BAH(-OS) Expansion Valve Spout A Spout B Drain Water Valve Evaporator Assembly Inlet Water Valve Float Switch Storage Bin Reservoir Agitator Control Box Power Switch Ice Dispensing Auger Door Switch Gear Motor Control Switch Dispense Mode Switch Agitating Motor Air-Cooled Condenser Dispensing Motor Compressor Shutter Assembly Dispensing Water Valve Drier Spout Cover 9 2. DCM-500BWH(-OS) Spout A Expansion Valve Spout B Evaporator Assembly Drain Water Valve Inlet Water Valve Float Switch Storage Bin Reservoir Agitator Control Box Power Switch Ice Dispensing Auger Door Switch Gear Motor Control Switch Dispense Mode Switch Agitating Motor Dispensing Motor Compressor Shutter Assembly Water-Cooled Condenser Dispensing Water Valve Drier Spout Cover 10 B. Ice Making Unit 1. DCM-500BAH(-OS), DCM-500BWH(-OS) Cubelet Cutter Extruding Head and Upper Bearing Allen Head Cap Screw Washer Auger Cylinder Evaporator Insulation Mechanical-Seal O-Ring Spline Coupling Allen Head Cap Screw with Washer Gear Motor Housing and Lower Bearing Hex Head Bolt with Washer 11 C. Sequence of Operation The steps in the sequence are as outlined below. When power is supplied, the power switch is in the "ON" position, the door switch is engaged, and the control switch is in the "ICE" position, the "POWER" LED on the control board comes on. 1. Fill Cycle WV opens and the reservoir fills with water until UF/S closes. Note: GM will not start unless UF/S is closed. For details, see "IV. Service Diagnosis". 2. Ice Purge Cycle (60 seconds) "GM" LED is on. WCR energizes, closing the low water safety circuit and de-energizing the WV. GM and GMPR energize. GM runs for 60 seconds to clear any ice from the evaporator. 3. Freeze Cycle "COMP", "GM" LEDs are on. Comp and FMS energize. As the water in the evaporator cools, ice starts forming within 4 to 6 minutes. This time frame depends on the inlet water and ambient temperature conditions. UF/S and LF/S operate WV as needed to continue the ice making process. This continues until BC shuts the icemaker down or power is turned off to the icemaker. 4. Drain Cycle 12 hour DT activates, "FLUSH" LED is on after 150 second shutdown sequence. Comp and FMS de-energize 90 seconds after the 12 hour DT activates, GMPR and GM de‑energize 60 seconds later. DV then energizes and remains energized for 20 minutes. 5. Shutdown BC is activated and a 150 second shutdown sequence begins. After BC has been open for 90 seconds, Comp and FMS de-energize, AM energizes for 0.6 seconds, and 60 seconds later GM de-energizes. Legend: AM–agitating motor; BC–bin control; Comp–compressor; DT–drain timer; FMS–self‑contained fan motor; GM–gear motor; GMPR–gear motor protect relay; LF/S–lower float switch; UF/S–upper float switch; WCR–water control relay; WV–inlet water valve 12 13 1. Startup 3. 12 Hour Drain Cycle Shutdown & Restart 60 seconds GM off GMPR off DV on (DC only) 3. Drain Cycle DV on for 20 minutes BC closed or 20 Min. DT off (DC only) DV off (DC only) 12 hour DT reset (DC only) 4. 12 hour DC - Restart See "1. Fill Cycle" above 4. Ice Level Lowered See "1. Fill Cycle" above UF/S open FT exceeded Comp continues FMS continues GM continues GMPR continues WV continues 90 seconds GM off GMPR off WV continues until UF/S closes Legend: BC - bin control Comp - compressor DC - drain cycle DT - drain timer DV - drain valve FMS - self-contained fan motor FT - fill timer (low water safety) GM - gear motor GMPR - gear motor protect relay LF/S - lower float switch UF/S - upper float switch WCR - water control relay WV - inlet water valve Comp off FMS off WV continues GM continues GMPR continues 60 seconds 150 sec. Shutdown Sequence Low Water Safety If refill > 90 sec. FT, 150 second shutdown sequence begins Components Energized when the Control Switch is in the "DRAIN" Position The "DRAIN" position on the control switch is used when cleaning and sanitizing the unit. This allows cleaner and sanitizer to drain from the reservoir and evaporator assembly. When switching to the "DRAIN" position during the freeze cycle, the drain valve does not energize until the 150 second shutdown sequence terminates (2. Shutdown & Restart). Note: To bypass the 150 second shutdown sequence, move the power switch to the "OFF" position, place the control switch in the "DRAIN" position, then move the power switch back to the "ON" position. Comp off FMS off GM continues GMPR continues 1. Drain Cycle initiates 2. Ice Purge Cycle 90 seconds 3. Icemaker is Off LF/S closed UF/S closed (WV off) WCR on FT off (90 sec.) WV off Comp continues FMS continues GM continues GMPR continues Refill (90 seconds) 3. Freeze Cycle UF/S open LF/S open (WV on) WCR off FT started (90 sec.) WV on Comp continues FMS continues GM continues GMPR continues 2. Ice Purge Cycle Comp on FMS on WCR continues GM continues GMPR continues 150 seconds 1. Bin Full LF/S closed UF/S closed (WV off) WCR on WV off GM on GMPR on 60 seconds 2. Ice Purge Cycle BC open or DC starts Comp continues FMS continues GM continues GMPR continues WV on UF/S open 2. Shutdown & Restart Power switch "ON" Control switch in "ICE" 1. Fill Cycle 4. 12 Hour Drain Cycle DV opens for 20 minutes every 12 hours See "3. 12 Hour Drain Cycle" below. DCM-500BAH(-OS), DCM-500BWH(-OS) Sequence Flow Chart and Component Operation D. Control Board • A Hoshizaki exclusive solid-state control board is employed in DCM-500BAH, DCM‑500BAH-OS, DCM-500BWH, and DCM‑500BWH‑OS Cubelet Icemaker / Dispensers. • All models are pretested and factory-adjusted. CAUTION 1. Fragile, handle very carefully. 2. The control board contains integrated circuits, which are susceptible to failure due to static discharge. It is especially important to touch the metal part of the unit before handling or replacing the board. 3. Do not touch the electronic devices on the control board or the back of the control board to prevent damage to the control board. 4. Do not change wiring and connections. Especially, never misconnect terminals. 5. Always replace the whole control board if it goes bad. 6. Do not short out power supply to test for voltage. 14 1. Control Board Layout a) DCM-500BAH, DCM-500BWH Flush Switch Must be left in the "P" position, otherwise the internal drain timer will not operate. Dispensing Components See "III. B. Wiring Diagrams" for details. High Pressure Switch Counter Reset Button (not used in this application) Bin Control, Control Switch, Low Water 10.5V Safety Transformer Microprocessor (board revision level indicated by last 2 digits on label) "DM" LED (X4 Relay) Shutter Solenoid, "AM" LED Dispensing Auger (X3 Relay) Motor Agitating Motor Portion Control Timer "COMP" LED (X2 Relay) Compressor, Fan Motor "POWER" LED (lights when power is supplied to the board) "GM" LED (X1 Relay) Gear Motor "FLUSH" LED (X5 Relay) Drain Valve 24V Supply Out Drain Valve 24V Out 24V In 115V In Dispensing Motor 115V Out 115V In Gear Motor Protect Relay Circuit Agitating Motor 115V Out Control Board Part Number 2A1592-01 15 115V In Gear Motor 115V Out b) DCM-500BAH-OS, DCM-500BWH-OS Flush Switch Must be left in the "P" position, otherwise the internal drain timer will not operate. Bin Control, Control Switch, Low Water Safety Dispensing Components See "III.B. Wiring Diagrams" for details. Counter Reset Button (not used in this application) Portion Control Timer High Pressure Switch Microprocessor (board revision level indicated by last 2 digits on label) "WTR" LED (X5 Relay) Dispensing Water Valve "ICE" LED "AM" LED (X4 Relay) (X3 Relay) Shutter Solenoid, Agitating Motor Dispensing Auger "COMP" LED Motor (X2 Relay) Compressor, Fan Motor 10.5V Transformer "POWER" LED (lights when power is supplied to the board) "GM" LED (X1 Relay) Gear Motor "FLUSH" LED (X6 Relay) Drain Valve 24V Supply Out 24V In 115V In Drain Valve 24V In 24V Out Dispensing Dispensing Motor Water Valve 115V Out 24V Out 115V In Gear Motor Protect Relay Circuit Agitating Motor 115V Out Control Board Part Number 2A2649-01 16 115V In Gear Motor 115V Out 2. Features The control board provides the following safeguards: • Provides component protection during low water supply. • Purges remaining ice in the evaporator at startup and shutdown. • Provides short cycle protection for the compressor. a) LED Lights The "POWER" LED indicates control voltage and will remain on unless a control voltage problem occurs. An LED illuminates for each relay as it is energized. For more information, see "II.C. Sequence of Operation." Cycle (Relay) LED Fill Ice Purge (X1) POWER only GM Freeze (X1, X2) GM, COMP Drain Valve (X6) FLUSH Relay LED Push Button DM Opti Serv ICE Icemaking Energized Components WV GM GM, Comp, FMS DV Time LEDs are Frequency LEDs are On On N/A As Needed 60 seconds N/A N/A N/A 20 Minutes Every 12 Hours Dispensing Energized Time LEDs are Component On Frequency LEDs are On IDM 60 seconds maximum N/A Agitating Motor (X3) AM AM .6 seconds Every 12 seconds of accumulative dispense time Water Dispense (X5) WTR (Opti Serv Only) WTR N/A N/A Ice Dispense (X4) Legend: AM–agitating motor, Comp–compressor; DV–drain valve; FMS–self‑contained fan motor; GM–gear motor; IDM–ice dispensing motor, shutter solenoid; WTR–dispensing water valve; WV–inlet water valve 17 3. Controls and Adjustments a) Portion Control When the dispense mode switch is placed in the "PORTION" position, a variable resistor (located on the control board) controls the ice dispense time. The figures on the label indicate dispensing time (sec.). When shipped, the portion control is set at the minimum dispensing time (0.6 sec.). DCM-500BAH(-OS), DCM-500BWH(-OS). . . . . . .Approximately 0.72 oz. Amount of ice dispensed per second. DCM-500BAH(-OS), DCM-500BWH(-OS) . . . . . . Approximately 1.2 oz. 4. Control Board Check Procedure Before replacing a control board that does not show a visible defect and that you suspect is bad, always conduct the following check procedure. This procedure will help you verify your diagnosis. a) Power Supply 1. Move the control switch to the "ICE" position. The "POWER" LED should come on. If the "POWER" LED is off, check that the power supply is on, the power switch is in the "ON" position, the door switch is engaged, and the control switch is in the "ICE" position. Check the transformer 10.5V secondary circuit and fuse. If the 10.5V secondary circuit (K4 pins 1 and 2) has proper voltage and the "POWER" LED is off, the control board is bad and should be replaced. If the secondary circuit does not have proper voltage, see "IV.C.1.[1] The icemaker will not start (Fill Cycle)" for further details. b) Ice Making Components 1. Confirm the reservoir is full of water. If no water is in the reservoir, make sure that the control switch is not in the "DRAIN" position and that the unit is not in the 12 hour drain cycle. Also check the water supply line, water shutoff valve, and water filters. In the fill cycle, the "POWER" LED is the only LED lit on the control board. If no water is filling the reservoir, check for 24V at connector K2 terminal 7 to neutral and connector K3 (DBU) to neutral. If there is 24V at connector K2 terminal 7 to neutral and no voltage at K3 (DBU) to neutral, the control board is bad and should be replaced. See "IV.C.1.[1] The icemaker will not start (Fill Cycle)" for further details. 2. When the reservoir is full, the "GM" LED comes on and the gear motor starts. If the "GM" LED does not come on or the gear motor does not start, check that the following safety circuits are closed: a) high pressure switch (DCM-500BAH and DCM500BWH, connector K4 terminals 9 and 10, DCM-500BAH-OS and DCM-500BWH‑OS, connector K4 terminals 5 and 6), b) low water safety/bin control/ice making switch circuit (connector K4 terminals 3 and 4). Next, check for 115/120V at connector K1 "COM" and K1 "NO" on the control board to neutral. If the "GM" LED is on and there is voltage at K1 "COM" to neutral and no voltage at K1 "NO" to neutral, the control board is bad and should be replaced. See wiring diagram "III.C.2. Ice Purge Cycle" for further details. 18 3. 60 seconds after the "GM" LED comes on, the "COMP" LED comes on, and the compressor and fan motor start. If the "COMP" LED does not come on 60 seconds after the gear motor starts, check that the gear motor protect relay contacts (connector K2 terminals 1 and 2) have closed. If the "COMP" LED is on and the compressor and fan motor did not start, check for 115/120V at X2 (LBU) and X2 (BR) on the control board to neutral. If the "COMP" LED is on and there is voltage at X2 (BR) to neutral and no voltage at X2 (LBU) to neutral, the control board is bad and should be replaced. See wiring diagram "III.C.3. Freeze Cycle" for further details. c) Dispensing Components DCM-500BAH, DCM-500BWH 1. Ice Dispense "Continuous": Pressing the ice dispense switch closes terminals 6 and 5 at the K4 connector. The "DM" LED comes on and the dispensing motor energizes. If the "DM" LED does not turn on, check continuity through the ice dispense switch and the dispense mode switch. If the LED is on and the dispensing motor does not start, check for 115/120V at connector K2 terminals 3 and 6 to a neutral. With voltage at terminal 3 and not at terminal 6, the control board is bad and should be replaced. Note: The agitating motor will operate .6 seconds every 12 seconds of accumulative dispense time. See "III.D.1. Continuous Dispense." 2. Ice Dispense "Portion": Pressing the ice dispense switch closes terminals 6 and 7 at the K4 connector. The "DM" LED comes on and the dispinsing motor energizes. If the "DM" LED does not turn on, check continuity through the ice dispense switch and the dispense mode switch. If the LED is on and the dispensing motor does not start, check for 115V at connector K2 terminals 3 and 6 to a neutral. With voltage at terminal 3 and not at terminal 6, the control board is bad and should be replaced. Note: The agitating motor will operate .6 seconds every 12 seconds of accumulative dispense time. See "III.D.2. Portion Dipsense." d) Dispensing Components DCM-500BAH-OS, DCM-500BWH-OS See "IV.C.5. Opti Serve (OS) Sensors." 19 E. Float Switch Depending on local water conditions, scale may build up on the float switch. Scale on the switch can cause the floats to stick. In this case, the float switch should be cleaned and checked. First, remove the switch from the water tank. Soak the switch assembly in ice machine cleaner. While not necessary, the floats can be removed from the shaft during cleaning. If you remove them, note that the blue float is on top. The floats must be installed with the magnets inside them towards the top of the switch. Installing the floats upside down will affect the timing of the float switch operation. Once clean, rinse and wipe the cleaner off. Next, check the switch with an ohm meter. This float switch has three wires (the black wire is common) and two separate switches. Check the upper switch by ohming out the black and red wires. When the float is up, the switch should be closed. Check the lower switch by ohming out the black and blue wires in the same manner. If either switch fails, the assembly should be replaced. Red (upper) Black (common) Blue (lower) Magnet (towards top) Upper Float (blue) Spring Retainer Clip Magnet (towards top) Lower Float (white) Plastic Retainer Clip 20 III. Technical Information A. Water Circuit and Refrigeration Circuit 1. DCM-500BAH(-OS) Inlet Water Valve Spout Water Supply Float Switch Water Level Reservoir Overflow Evaporator Drier Expansion Valve To Drain Drain Valve Gear Motor Dispensing Water Valve High Pressure Switch Fan Air-Cooled Condenser Access Valve Compressor Refrigeration Circuit Water Circuit 21 Access Valve 2. DCM-500BWH(-OS) Spout Inlet Water Valve Water Supply Float Switch Water Level Reservoir Evaporator Overflow Drier Expansion Valve To Drain Drain Valve Gear Motor Dispensing Water Valve Water Supply In Water-Cooled Condenser Water Supply Out High Pressure Switch Water Regulating Valve Access Valve Refrigeration Circuit Water Circuit 22 Compressor Access Valve B. Wiring Diagrams 1. DCM-500BAH, DCM-500BWH (Control Board) * WIRE COLOR CODE BK BLACK BR BROWN BU BLUE DBU DARK BLUE GY GRAY LBU LIGHT BLUE O ORANGE P PINK R RED V VIOLET W WHITE Y YELLOW W/BK WHITE/BLACK W/BR WHITE/BROWN W/BU WHITE/BLUE W/O WHITE/ORANGE W/R WHITE/RED * High Pressure Switch 23 Air-Cooled Model Water-Cooled Model Cut-out 412± PSIG 384±210 PSIG Cut-in 327±21 PSIG 284±21 PSIG 21 0 2. DCM-500BAH-OS, DCM-500BWH-OS (Control Board) * WIRE COLOR CODE BK BLACK BR BROWN BU BLUE DBU DARK BLUE GY GRAY LBU LIGHT BLUE O ORANGE P PINK R RED V VIOLET W WHITE Y YELLOW W/BK WHITE/BLACK W/BR WHITE/BROWN W/BU WHITE/BLUE W/O WHITE/ORANGE W/R WHITE/RED * High Pressure Switch Air-Cooled Model Water-Cooled Model Cut-out 412± PSIG 384±210 PSIG Cut-in 327±21 PSIG 284±21 PSIG 24 21 0 C. Sequence of Electrical Circuit – Ice Making 1. Fill Cycle With the power switch in the "ON" position and the control switch in the "ICE" position, the inlet water valve energizes and the reservoir fills with water until the upper float switch closes. DCM-500BAH-OS DCM-500BWH-OS DCM-500BAH DCM-500BWH (Control Board) (Control Board) WIRE COLOR CODE BK BR BU DBU GY LBU BLACK BROWN BLUE DARK BLUE GRAY LIGHT BLUE O P R V W Y ORANGE PINK RED VIOLET WHITE YELLOW 25 W/BK W/BR W/BU W/O W/R WHITE/BLACK WHITE/BROWN WHITE/BLUE WHITE/ORANGE WHITE/RED 2. Ice Purge Cycle Upper float switch closes, water control relay energizes, inlet water valve closes, gear motor starts, gear motor protect relay energizes. DCM-500BAH-OS DCM-500BWH-OS DCM-500BAH DCM-500BWH (Control Board) (Control Board) WIRE COLOR CODE BK BR BU DBU GY LBU BLACK BROWN BLUE DARK BLUE GRAY LIGHT BLUE O P R V W Y ORANGE PINK RED VIOLET WHITE YELLOW 26 W/BK W/BR W/BU W/O W/R WHITE/BLACK WHITE/BROWN WHITE/BLUE WHITE/ORANGE WHITE/RED 3. Freeze Cycle Compressor and fan motor start 60 seconds after gear motor starts. DCM-500BAH-OS DCM-500BWH-OS DCM-500BAH DCM-500BWH (Control Board) (Control Board) WIRE COLOR CODE BK BR BU DBU GY LBU BLACK BROWN BLUE DARK BLUE GRAY LIGHT BLUE O P R V W Y ORANGE PINK RED VIOLET WHITE YELLOW 27 W/BK W/BR W/BU W/O W/R WHITE/BLACK WHITE/BROWN WHITE/BLUE WHITE/ORANGE WHITE/RED 4. 12 Hour Drain Cycle / Drain Switch 12 hour timer initiates cycle or the control switch is moved to the "DRAIN" position. 90 seconds after initiation, the compressor and condenser fan motor stop, 60 seconds later the gear motor stops. Once the gear motor protect relay de-energizes, the drain water valve opens. In the 12 hour drain cycle, the drain water valve remains open for 20 minutes. When the drain cycle is initiated manually using the control switch, the drain valve remains open until the control switch is moved to the "ICE" position. DCM-500BAH-OS DCM-500BWH-OS DCM-500BAH DCM-500BWH 12 Hour Drain Cycle 12 Hour Drain Cycle Manual Drain Cycle Manual Drain Cycle (Control Board) (Control Board) WIRE COLOR CODE BK BR BU DBU GY LBU BLACK BROWN BLUE DARK BLUE GRAY LIGHT BLUE O P R V W Y ORANGE PINK RED VIOLET WHITE YELLOW 28 W/BK W/BR W/BU W/O W/R WHITE/BLACK WHITE/BROWN WHITE/BLUE WHITE/ORANGE WHITE/RED 5. Shutdown The bin control switch is activated and a 150 second shutdown sequence begins. After the bin control has been open for 90 seconds, the compressor and fan motor stop, the agitating motor operates for 0.6 seconds, and 60 seconds later the gear motor stops. DCM-500BAH-OS DCM-500BWH-OS DCM-500BAH DCM-500BWH (Control Board) (Control Board) WIRE COLOR CODE BK BR BU DBU GY LBU BLACK BROWN BLUE DARK BLUE GRAY LIGHT BLUE O P R V W Y ORANGE PINK RED VIOLET WHITE YELLOW 29 W/BK W/BR W/BU W/O W/R WHITE/BLACK WHITE/BROWN WHITE/BLUE WHITE/ORANGE WHITE/RED 6. Low Water Safety Upper float switch fails to close within 90 seconds after the lower float switch opens, the 150 second shutdown sequence begins. The inlet water valve remains open until the upper float switch closes. DCM-500BAH-OS DCM-500BWH-OS DCM-500BAH DCM-500BWH (Control Board) (Control Board) WIRE COLOR CODE BK BR BU DBU GY LBU BLACK BROWN BLUE DARK BLUE GRAY LIGHT BLUE O P R V W Y ORANGE PINK RED VIOLET WHITE YELLOW 30 W/BK W/BR W/BU W/O W/R WHITE/BLACK WHITE/BROWN WHITE/BLUE WHITE/ORANGE WHITE/RED 7. High Pressure Switch When the high pressure switch opens, the compressor stops immediately, 60 seconds later the gear motor stops. To restart, allow time for the high pressure switch to close, then move the power switch to the "OFF" position and then back to the "ON" position. DCM-500BAH DCM-500BWH DCM-500BAH-OS DCM-500BWH-OS (Control Board) (Control Board) WIRE COLOR CODE BK BR BU DBU GY LBU BLACK BROWN BLUE DARK BLUE GRAY LIGHT BLUE O P R V W Y ORANGE PINK RED VIOLET WHITE YELLOW 31 W/BK W/BR W/BU W/O W/R WHITE/BLACK WHITE/BROWN WHITE/BLUE WHITE/ORANGE WHITE/RED D. Sequence of Electrical Circuit – Dispensing 1. Continuous Dispense Agitating motor energizes for .6 seconds for every 12 seconds of accumulative dispense time. Maximum dispense time per dispense switch activation is 60 seconds. After 60 seconds, the dispense switch must be disengaged and engaged again. DCM-500BAH-OS DCM-500BWH-OS DCM-500BAH DCM-500BWH (Control Board) (Control Board) WIRE COLOR CODE BK BR BU DBU GY LBU BLACK BROWN BLUE DARK BLUE GRAY LIGHT BLUE O P R V W Y ORANGE PINK RED VIOLET WHITE YELLOW 32 W/BK W/BR W/BU W/O W/R WHITE/BLACK WHITE/BROWN WHITE/BLUE WHITE/ORANGE WHITE/RED 2. Portion Dispense Agitating motor energizes for .6 seconds for every 12 seconds of accumulative dispense time. A variable resistor which controls the amount of ice dispensed is located on the control board. The figures on the label indicate dispensing time (sec.). See "II. D.3.a) Portion Control." When shipped, the portion control is set at the minimum dispensing time (0.6 sec.). DCM-500BAH(-OS), DCM-500BWH(-OS) . . . . . . . . . . . . Approximately 0.72 oz. Amount of ice dispensed per second. DCM-500BAH(-OS), DCM-500BWH(-OS) . . . . . . . . . . . . Approximately 1.2 oz. DCM-500BAH-OS DCM-500BWH-OS DCM-500BAH DCM-500BWH (Control Board) (Control Board) WIRE COLOR CODE BK BR BU DBU GY LBU BLACK BROWN BLUE DARK BLUE GRAY LIGHT BLUE O P R V W Y ORANGE PINK RED VIOLET WHITE YELLOW 33 W/BK W/BR W/BU W/O W/R WHITE/BLACK WHITE/BROWN WHITE/BLUE WHITE/ORANGE WHITE/RED E. Performance Data 1. DCM-500BAH(-OS) APPROXIMATE ICE PRODUCTION PER 24 HR. lbs./day ( kg/day) APPROXIMATE ELECTRIC CONSUMPTION watts APPROXIMATE WATER CONSUMPTION PER 24 HR. gal. / day (l/day) EVAPORATOR OUTLET TEMP. °F (°C) HEAD PRESSURE PSIG (kg/cm2G) SUCTION PRESSURE PSIG (kg/cm2G) TOTAL HEAT OF REJECTION Ambient Temp. (°F) 70 80 90 100 70 80 90 100 70 80 90 100 70 80 90 100 70 80 90 100 70 80 90 100 Water Temp. 70 *535 (243) 510 (231) 461 (209) 438 (199) 396 (179) *385 (175) 340 (154) 323 (147) *985 -995 -1015 -1025 -1045 -*1055 -1058 -1059 -*64 (243) 61 (231) 55 (209) 53 (199) 48 (179) *46 (175) 41 (154) 39 (147) *23 (-5) 23 (-5) 23 (-5) 26 (-4) 26 (-4) *26 (-4) 28 (-3) 28 (-3) *230 (16.2) 230 (16.2) 264 (18.5) 264 (18.5) 297 (20.9) *297 (20.9) 335 (23.5) 335 (23.5) *33 (2.3) 33 (2.3) 35 (2.5) 35 (2.5) 37 (2.6) *37 (2.6) 43 (3.0) 43 (3.0) 6300 BTU/h (AT 90°F /WT 70°F) 50 (°F) 485 416 358 *304 1005 1035 1056 *1060 58 50 43 *37 23 26 28 *28 230 264 297 *335 33 35 37 *43 90 (220) (189) (162) (138) ----(220) (189) (162) (138) (-5) (-4) (-3) (-3) (16.2) (18.5) (20.9) (23.5) (2.3) (2.5) (2.6) (3.0) Note: 1. The data without *marks should be used for reference only. 2. We reserve the right to make changes in specifications and design without prior notice. 34 2. DCM-500BWH(-OS) APPROXIMATE ICE PRODUCTION PER 24 HR. lbs./day ( l/day) APPROXIMATE ELECTRIC CONSUMPTION watts APPROXIMATE WATER CONSUMPTION PER 24 HR. (TOTAL) gal. / day (kl/day) EVAPORATOR OUTLET TEMP. °F (°C) HEAD PRESSURE PSIG (kg/cm2G) SUCTION PRESSURE PSIG (kg/cm2G) Ambient Temp. (°F) 70 80 90 100 70 80 90 100 70 80 90 100 70 80 90 100 70 80 90 100 70 80 90 100 WATER FLOW FOR CONDENSER PRESSURE DROP OF COOLING WATER LINE HEAT OF REJECTION FROM CONDENSER HEAT OF REJECTION FROM COMPRESSOR Water Temp. 70 * 567 257 549 249 529 240 519 235 500 227 * 495 224 472 214 464 210 * 976 -967 -976 -967 -976 -* 967 -976 -967 -* 111 0.51 130 0.59 111 0.50 130 0.59 110 0.50 * 130 0.59 110 0.50 132 0.60 * 19 -7 19 -7 19 -7 19 -7 19 -7 * 19 -7 19 -7 19 -7 * 266 18.7 267 18.8 266 18.7 267 18.8 266 18.7 * 267 18.8 266 18.7 267 18.8 * 44 3.1 44 3.1 44 3.1 44 3.1 44 3.1 * 44 3.1 44 3.1 44 3.1 21 gal/h (AT 90°F /WT 70°F) Less than 7 PSIG 5438 BTU/h (AT 90°F /WT 70°F) 1104 BTU/h (AT 90°F /WT 70°F) 50 (°F) 539 509 481 * 428 991 991 991 * 991 194 198 203 * 214 19 19 19 * 19 270 270 270 * 270 47 47 47 * 47 90 244 231 218 194 ----0.88 0.90 0.92 0.97 -7 -7 -7 -7 19.0 19.0 19.0 19.0 3.3 3.3 3.3 3.3 Note: 1. The data without *marks should be used for reference only. 2. We reserve the right to make changes in specifications and design without prior notice. 35 IV. Service Diagnosis A. 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, adequate water supply (minimum of 10 PSIG, maximum of 113 PSIG) and proper voltage per unit nameplate. Always choose a white neutral wire to establish a good neutral connection when checking voltages. LEDs on the control board correspond to the components as they energize. 1) Move the control switch to the "OFF" position, then turn off the power supply. Remove the upper and lower front panels. Confirm the power switch is in the "ON" position and the door switch is engaged. 2) Turn on the power supply, then move the control switch to the "ICE" position. The "POWER" LED is on. The "POWER" LED will not come on if the door switch is not engaged. 3) Fill Cycle – The inlet water valve energizes. The reservoir fills. The lower float switch closes. Nothing occurs at this time. The reservoir continues to fill until the upper float switch closes, energizing the water control relay, which closes the low water safety circuit and de-energizes the inlet water valve. Diagnosis: Check that the inlet water valve fills the reservoir. If not, check for water supply line shut-off valve closed, clogged water filters, clogged inlet water valve screen, power circuit to the inlet water valve (power switch, door switch, power protect relay contacts, transformer, fuses, high pressure switch, bin control, control switch, float switch, water control relay contacts), and the coil on the inlet water valve. Check that the inlet water valve shuts off when the upper float switch closes. If not, check the float switch, water control relay, and inlet water valve. 4) Ice Purge Cycle – "GM" LED is on (60 second short cycle protection). The 60 second timer starts, the gear motor protect relay and gear motor energize. Diagnosis: Check that the gear motor starts. If not, check that the water control relay is energized (inlet water valve should be closed). Check the low water safety circuit on the water control relay (terminals 4 and 6), check for 115/120V at the K1 connector "COM" terminal to neutral and "NO" terminal to neutral on the control board (see wiring diagram), check the gear motor fuse (overload protector), thermal protector, gear motor capacitor, and motor windings. If the gear motor starts, but the auger does not turn, check the gear motor coupling between the auger and the gear motor. If the compressor starts at the same time the gear motor starts, check the X2 compressor relay on the control board. 5) Freeze Cycle – "GM", "COMP" LED are on. The compressor and fan motor energize, the gear motor protect relay, gear motor, and water control relay remain energized. Ice production begins 4 to 6 minutes after the compressor and fan motor start depending on ambient and water temperature conditions. Diagnosis: Check that the compressor and fan motor are running. If not, check for voltage on and to the compressor (X2 relay on the control board). Check that the gear motor protect relay circuit terminals 3 and 5 are closed, check the compressor internal overload (thermal protector), the compressor capacitors, fan capacitor, and voltage to the fan motor. 36 6) Refill /Low Water Safety – As ice is produced, the water level in the reservoir drops. As the water level drops, the upper and lower float switches open. First, the upper float switch opens. Nothing occurs at this time. When the lower float switch opens, refill begins. The water control relay de‑energizes, the 90 second low water safety timer begins, and the inlet water valve energizes. The compressor, fan motor, and gear motor continue to run. When the upper float switch closes, the water control relay energizes, the 90 second low water safety timer terminates, and the inlet water valve de-energizes. If the upper float switch fails to close within 90 seconds after the inlet water valve energizes, a 150 second shutdown sequence begins. 90 seconds after the 90 second low water safety timer is complete, the compressor and fan motor de-energize, 60 seconds later the gear motor de-energizes. The inlet water valve continues until the upper float switch closes. Diagnosis – Check that the reservoir fills. If not, check the water supply line, clogged water filters, dirty or sticking float switches, inlet water valve screen, water control relay contacts, voltage to the inlet water valve, and inlet water valve solenoid or drain valve leaking. 7) Drain Cycle – "FLUSH" LED is on. 12 hour timer activates the flush cycle and a 150 second shutdown sequence begins. 90 seconds after the 12 hour timer activates, the compressor and fan motor de-energize, 60 seconds later the gear motor de‑energizes. The drain valve then energizes and remains energized for 20 minutes. Once the 20 minute drain timer is complete, the 12 hour drain cycle timer resets and the fill cycle begins. 8) Shutdown – The bin fills and activates the bin control. A 150 second shutdown sequence begins. After the bin control has been open for 90 seconds, the compressor and fan motor stop, the agitating motor energizes for 0.6 seconds, and 60 seconds later the gear motor stops. Diagnosis: Check that the bin control paddle is activated and that the bin control switch opens. If the compressor and gear motor fail to stop, check the bin control (proximity) switch and control board relays. B. 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 icemaker 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 for the total production in 24 hours. When confirming production or diagnosing low production, see "III.E. Performance Data." 37 C. Diagnostic Charts 1. No Ice Production Problem Possible Cause [1] The icemaker will not a) Power Supply start. (Fill Cycle) Remedy 1. Off, blown fuse, or tripped breaker. 1. Turn on, replace, or reset. 2. Loose connection. 2. Tighten. 3. Bad contacts. 3. Check for continuity and replace. 4. Not within specifications. 4. Refer to nameplate and correct. b) Water Supply 1. Water supply off or pressure too low. 1. Check and get recommended pressure. c) Power Switch (Control Box) 1. "OFF" position. 1. Move to "ON" position. 2. Bad contacts. 2. Check for continuity and replace. 1. Door switch not engaged. 1. Engage door switch. 2. Bad contacts. 2. Check for continuity and replace. 1. Voltage not within specifications. 1. Refer to nameplate and correct. 2. Bad contacts. 2. Check for continuity and replace. f) Transformer 1. Coil winding open. 1. Replace. g) Fuses (2) 1. Blown. 1. Check for short circuit and replace. h) Control Switch 1. "OFF" or "DRAIN" position. 1. Move to "ICE" position. 2. Bad contacts. 2. Check for continuity and replace. 1. Bad contacts. 1. Check for continuity and replace. 2. Coil winding open. 2. Replace. 1. Mesh filter or orifice clogged. 1. Clean. 2. Coil winding open. 2. Replace. 3. Wiring to inlet water valve. 3. Check for loose or open connection. Repair or replace. 1. Bad contacts. 1. Check for continuity and replace. 2. Float does not move freely. 2. Clean or replace. 1. Open. 1. Bin full, check for continuity on proximity switch. 2. Actuator sticking. 2. Adjust or replace. d) Door Switch e) Power Protect Relay i) Water Control Relay j) Inlet Water Valve k) Float Switch l) Bin Control 3. Proximity switch open. 3. Replace. 38 Problem [1] The icemaker will not start. (Fill Cycle) (continued) Possible Cause Remedy m) High Pressure Switch 1. Bad contacts. 1. Check for continuity and replace. 2. Dirty air filter or condenser. 2. Clean. 3. Ambient or condenser 3. Reduce temperature. water temperature too warm. 4. Refrigerant overcharged. 4. Recover, evacuate, and recharge. 5. Fan not operating (except water-cooled model). 5. See "3.[2]a) Fan Motor." 6. Refrigerant line or 6. Remove the restriction or components restricted. component and replace the drier. 7. Check and get 7. Condenser water recommended pressure. pressure too low or off (water-cooled model only). [2] Fill cycle will not terminate. 8. Water regulating valve set too high (water‑cooled model only). 8. Adjust it lower. n) Plug and Receptacle (Control Box) 1. Disconnected. 1. Connect. 2. Loose terminal. 2. Repair terminal connection. o) Control Board 1. Defective. 1. See "II.D.4. Control Board Check Procedure." a) Water Supply 1. Water supply off or pressure too low. 1. Check and get recommended pressure. b) Float Switch 1. Connector disconnected. 1. Reconnect. 2. Float does not move freely. 2. Clean or replace. 3. Defective switch. 3. Check and replace. 1. Contacts sticking. 1. Replace. c) Water Control Relay 2. Coil winding open. 2. Replace. d) Drain Valve 1. Valve seat won't seal and water leaking. 1. Clean or replace. e) Hoses 1. Disconnected or damaged. 1. Reconnect or replace. f) Control Board 1. Defective. 1. See "II.D.4. Control Board Check Procedure." 39 Problem [3] Ice purge cycle will not start. Possible Cause Remedy a) Water Control Relay 1. Low water safety circuit open (bad contacts ). 1. Replace. b) Control Switch 1. Bad contacts. 1. Check for continuity and replace. c) Bin Control 1. Open. 1. Bin full, check for continuity on proximity switch. d) Control Board 1. Fails to operate gear motor relay. 1. See "II.D.4. Control Board Check Procedure." e) Gear Motor Fuse 1. Blown. 1. Check gear motor amperage, bearing wear (see "V.F.1. Upper Bearing Wear Check"), and supply voltage. f) Gear Motor Thermal Protector 1. Open. 1. Check gear motor bearings, supply voltage. g) Gear Motor 1. Open windings. 1. Replace. 2. Auger coupling broke. 2. Replace. [4] Freeze cycle will not start (compressor). 3. Locked bearings. 3. Replace. a) Gear Motor Protect Relay 1. Open coil. 1. Replace. 2. Open contacts. 2. Replace. b) Control Board 1. Defective. 1. See "II.D.4. Control Board Check Procedure." c) Starter (Start Relay) 1. Bad contacts. 1. Check for continuity and replace. 2. Coil winding open. 2. Replace. 3. Loose connections. 3. Tighten. d) Start Capacitor or Run Capacitor 1. Defective. 1. Replace. e) Compressor 1. Power supply not within specifications. 1. Refer to nameplate and correct. 2. Wiring to compressor. 2. Check for loose or open connection, repair or replace. [5] All components run, but no ice is produced. a) Refrigerant 3. Defective. 3. Replace. 4. Compressor locked and internal motor protector tripped. 4. Replace. 1. Low charge. 1. See "V.B. Service for Refrigerant Lines." 2. Refrigerant line or 2. Remove the restriction or component restricted. component and replace the drier. b) Expansion Valve c) Compressor 3. Air or moisture trapped. 3. Recover refrigerant, replace drier, evacuate, and recharge. 1. Bulb loose. 1. Secure bulb. 2. Operating erratically. 2. Check and replace. 1. Defective. 1. Replace. 40 Problem Possible Cause Remedy [5] All components d) Evaporator run, but no ice is e) Water Supply Line produced. (continued) (water-cooled model only) 1. Defective. 1. Replace. 1. Condenser water pressure too low or off and high pressure control opens and closes frequently. 1. Check and get recommended pressure. f) Water Regulating Valve 1. Water regulating 1. Clean, adjust, or replace. (water-cooled model valve set too high or only) clogged (water-cooled model only). 2. Low Ice Production Problem [1] Low ice production. Possible Cause Remedy a)Evaporator 1. Dirty or defective. 1. Clean or replace. b)Bin Control 1. Erratic, sticking, defective. 1. Clean or replace. c) Drain Valve 1. Leaking water. 1. Clean or replace. d)Expansion Valve e)Refrigerant Charge 1. Bulb loose. 1. Secure bulb. 2. Operating erratically. 2. Check and replace. 1. Low charge. 1. See "V.B. Service for Refrigerant Lines." 2. Overcharge. 2. See "V.B. Service for Refrigerant Lines." f) Refrigerant Line 1. Refrigerant line or 1. Repair/replace the component restricted. clogged line/component and replace the drier. g)High-Side Pressure Too High 1. Dirty air filter or condenser. 1. Clean. 2. Ambient (or 2. Reduce temperature. condenser) water temperature too warm. 3. Fan motor slow rpm. 3. See "3. [2] a) Fan Motor." 4. Fan motor capacitor. 4. Check and replace. 5. Condenser water 5. Check and get pressure too low or off recommended pressure. (water-cooled model only). 6. Water regulating 6. Clean, adjust, or replace. valve set too high or clogged (water-cooled model only). h)Compressor 1. Inefficient compressor. 1. Replace 2. Faulty thermal protector (overload). 2. Replace compressor. 3. Faulty capacitor/ starter. 3. Replace. 41 3. Other Problem Possible Cause Remedy [1] Icemaker will not stop a)Bin Control when bin is filled with ice. 1. Actuator sticking. 1. Adjust or replace. 2. Proximity switch closed. 2. Replace. [2] Abnormal noise. 1. Bearing worn out. 1. Replace. 2. Fan blade deformed. 2. Replace fan blade. 3. Fan blade does not move freely. 3. Replace. a)Fan Motor (except water-cooled model) b)Compressor 2. Mounting pad out of position. 2. Reinstall. c) Refrigerant Lines 1. Rub or touch other lines or surfaces. 1. Reposition. d)Auger 1. Bearings or auger worn out. 1. Replace bearings or auger. See "V.F. Removal and Replacement of Evaporator Assembly Components." e)Gear Motor 1. Bearing or gear worn out / damaged. 1. Replace. f) Evaporator 1. Scale on inside wall 1. Use "SCALE AWAY" of evaporator freezing solution to clean cylinder. periodically. See "VI. A. Cleaning and Sanitizing Instructions." If the water is found hard by testing, install a softener. 2. Evaporator defective. 2. Replace. 1. Water pressure too high. 1. Install a pressure reducing valve. 1. Diaphragm does not close. 1. Clean or replace. c) Float Switch 1. Bad contacts. 1. Check for continuity and replace. d)Water Control Relay 1. Bad contacts. 1. Replace a)Power Supply 1. Not within specifications. 1. Refer to nameplate and correct. b)Evaporator Assembly 1. Bearings or auger worn out. 1. Replace bearings or auger. See "V.F.1. Upper Bearing Wear Check." c) Bin Control 1. Bad contacts. 1. Check for continuity and replace. 2. Actuator does not move freely. 2. Clean actuator or replace bin control assembly. d)Safety Switch and Relay 1. Switch misaligned, contacts bad. 1. Check and correct or replace. e)Control Board 1. Erratic operation of gear motor relay. 1. See "II.D.4. Control Board Check Procedure." [3] Overflow from a)Water Supply reservoir (water does not stop). b)Inlet Water Valve [4] Gear motor overload protector operates frequently or fuse blows frequently. 1. Bearings worn out, or 1. Replace. cylinder valve broken. 42 4. Dispensing Problem [1] No ice dispensed. Possible Cause a) Power Supply b) Ice Storage c) Ice Dispense Switch d) Shutter Assembly e) Dispense Gear Motor f) Auger Mechanism g) Control Board [2] Abnormal noise. a) Gear Motor or Gear Head b) Auger Mechanism c) Dispense Water Solenoid 1. "OFF" position. 2. Loose connection. 3. Bad contacts. 4. Not within specifications. 1. No ice or little ice in storage bin. 2. Ice bridge or ice block formed. 3. Agitating motor defective. 1. Opti Serve sensor defective. (OS only) 2. Bad contacts. (push button only) 1. Broken part. 2. Open windings on solenoid. 1. Thermal protector is tripped. 2. Gear motor winding open. 3. Bearing worn out. 4. Wiring to gear motor. 5. Defective capacitor. 1. Bad alignment of auger. 1. Defective. 1. Bearing worn out. 1. Bad alignment of auger. 2. Foreign matter interrupting agitator. 1. Vibration due to loosening screws. 43 Remedy 1. Move to "ON" position. 2. Tighten. 3. Check for continuity and replace. 4. Refer to nameplate and correct. 1. Make ice. 2. Melt ice, resupply with new ice. 3. Check, replace. 1. See "5. Opti Serve (OS) Sensors." 2. Check for continuity and replace. 1. Check and replace. 2. Check continuity and replace. 1. Allow to cool. 2. Replace. 3. Replace. 4. Check for loose connection or open circuit, and replace wiring as needed. 5. Replace. 1. Realign. 1. See "II.D.4. Control Board Check Procedure." 1. Replace. 1. Realign. 2. Remove foreign matter. 1. Apply thread sealant to the parts and tighten. Problem Possible Cause [3] No water dispensed. a) Power Supply b) Water Supply c) Dispensing Water Valve d) Control Board 1. "OFF" position. 1. Water supply off or pressure too low. 1. Coil winding open. Remedy 1. Move to "ON" position. 1. Check and get recommended pressure. 1. Replace. 2. Wiring to dispensing water valve. 2. Check for loose or open connection. Repair or replace. 1. Defective. 1. See "II.D.4. Control Board Check Procedure." 1. See "5. Opti Serve (OS) Sensors." 2. Check for continuity and replace. e) Water Dispense Switch 1. Opti Serve sensor defective. (OS only) 2. Bad contacts. (push button only) 5. Opti Serve (OS) Sensors Be sure to check all items in section "IV.C.4. Dipsensing" prior to using this chart. Use the following charts along with the wiring diagram to troubleshoot the OS sensors. Problem [1] No ice dispensed. Possible Cause a) OS Sensor 1. Dirty sensor. 2. Defective. b) Dispense Mode Switch 1. Wrong setting. 2. Bad contacts. 3. Loose connection. c) Control Board 1. Loose connection. 1. Tighten. 2. Defective. 2. See "II.D.4. Control Board Check Procedure" and chart 5a and 5b below. 1. Clean. 2. See chart 5c below. 1. Move to desired setting. 2. Check for continuity and replace. 3. Tighten. 1. Tighten. 2. See "II.D.4. Control Board Check Procedure" and chart 5c below. [2] No water dispensed. a) OS Sensor 1. Dirty sensor. 2. Defective. b) Dispense Mode Switch 1. Wrong setting. 2. Bad contacts. c) Control Board Remedy 1. Clean, using Scale Away (6 fl. oz. (0.8 l) per 1 gal. (3.8 l) of water) or other non‑abrasive cleaner. 2. See chart 5a and 5b below. 1. Move to desired setting. 2. Check for continuity and replace. 3. Tighten. 3. Loose connection. 1. Loose connection. 2. Defective. 44 5a. Ice Dispensing "Continuous" Mode Component Solenoid Control Board K2 Pin 6 LBU Sensor - To Sensor K5 Pin 4 W/0 R To Control Board /Other Neutral/GND K5 Pin 5 Y K5 Pin 6 W/BR Sensor WH BK On Off 120VAC 0VAC 5VDC 0VDC 5VDC 5VDC Control Board /Other Neutral/GND K5 Pin 2 W/BU K5 Pin 3 W/BK Sensor WH BK On Off 120VAC 0VAC 5VDC 0VDC 5VDC 5VDC 5b. Ice Dispensing "Portion" Mode Component Solenoid Control Board K2 Pin 6 LBU Sensor - To Sensor K5 Pin 1 W/R R To 5c. Water Dispensing Component Solenoid Control Board K2 Pin 8 DBU To Sensor K5 Pin 7 R To Control Board /Other K4 Pin 2 (LBU) K5 Pin 8 WH K5 Pin 9 BK 45 On 24VAC 5VDC 5VDC Off 0VAC 0VDC 5VDC V. Removal and Replacement of Components IMPORTANT 1. Ensure all components, fasteners, and thumbscrews are securely in place after the equipment is serviced. 2. The Polyol Ester (POE) oils used in R-404A units can absorb moisture quickly. Therefore it is important to prevent moisture from entering the system when replacing or servicing parts. 3. 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. 4. Do not leave the system open for longer than 15 minutes when replacing or servicing parts. A. Service for Refrigerant Lines WARNING Use an electronic leak detector or soap bubbles to check for leaks. Add a trace of refrigerant to the system (if using an electronic leak detector), and then raise the pressure using nitrogen gas (140 PSIG). DO NOT use R-404A as a mixture with pressurized air for leak testing. 1. Refrigerant Recovery The icemaker 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 WARNING 1. R-404A itself is not flammable at atmospheric pressure and temperatures up to 176°F (80°C). 2. R-404A itself is not explosive or poisonous. However, when exposed to high temperatures (open flames), R-404A can be decomposed to form hydrofluoric acid and carbonyl fluoride both of which are hazardous. 3. Always recover the refrigerant and store it in an approved container. Do not discharge the refrigerant into the atmosphere. 4. Do not use silver alloy or copper alloy containing arsenic. 5. 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 1) 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. 2) Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG. 3) Use an electronic leak detector or soap bubbles to check for leaks. Add a trace of refrigerant to the system (if using an electronic leak detector), and then raise the pressure using nitrogen gas (140 PSIG). DO NOT use R-404A as a mixture with pressurized air for leak testing. 3. Evacuation and Recharge (R-404A) 1) Attach a vacuum pump to the system. Be sure to connect the charging hoses to both high and low-side access valves. IMPORTANT The vacuum level and vacuum pump may be the same as those for current refrigerants. However, the rubber hose and gauge manifold to be used for evacuation and refrigerant charge should be exclusively for POE oils. 2) Turn on the vacuum pump. Open the service 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 service manifold. 5) Disconnect the vacuum pump and attach a refrigerant service cylinder to the high‑side line. Remember to loosen the connection and purge the air from the hose. See the nameplate for the required refrigerant charge. Hoshizaki recommends only virgin refrigerant or reclaimed refrigerant which meets ARI Standard No. 700-88 be used. 6) A liquid charge is recommended for charging an R-404A system. Invert the service cylinder and place it on scales. Open the high-side valve on the service manifold. 7) Allow the system to charge with liquid until the proper charge weight is met. 8) If necessary, add any remaining charge to the system through the low-side. Use a throttling valve or liquid dispensing device to add the remaining liquid charge through the low-side access port with the unit running. 9) Close the service manifold valves and disconnect the service manifold hoses. 10) Cap the access valves to prevent a possible leak. 47 B. Removal and Replacement of Compressor IMPORTANT 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. Note: When replacing a compressor with a defective winding, be sure to install the new start capacitor and start relay supplied with the replacement compressor. Due to the ability of the POE oil in the compressor to absorb moisture quickly, the compressor must not be opened more than 15 minutes for replacement or service. Do not mix lubricants of different compressors even if both are charged with R‑404A, except when they use the same lubricant. 1) 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 apron panel, then remove the right side panel. 3) Disconnect the drip tray hose from the tee. Remove the four screws securing the drip tray, then remove the drip tray and hose. 4) Recover the refrigerant and store it in an approved container. 5) Remove the terminal cover on the compressor and disconnect the compressor wiring. 6) Remove the discharge, suction, and process pipes. 7) Remove the compressor hold-down bolts, washers, and rubber grommets. 8) Remove the compressor. Unpack the new compressor package. 9) Attach the rubber grommets of the prior compressor to the new compressor. 10) Place the compressor in position and secure it using the bolts and washers. 11) Remove the drier, then place the new drier in position. 12) Remove plugs from the suction, discharge, and process pipes. 13) Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG. 14) Use an electronic leak detector or soap bubbles to check for leaks. Add a trace of refrigerant to the system (if using an electronic leak detector), and then raise the pressure using nitrogen gas (140 PSIG). DO NOT use R-404A as a mixture with pressurized air for leak testing. 15) Evacuate the system, and charge it with refrigerant. See the nameplate for the required refrigerant charge. 16) Connect the terminals and replace the terminal cover in its correct position. 17) Replace the drip tray and drip tray hose in their correct positions. Secure the hose to the tee. Pour water into the drip tray and check for leaks. 18) Move the 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. 48 C. Removal and Replacement of Expansion Valve IMPORTANT Sometimes moisture in the refrigeration circuit exceeds the drier capacity and freezes up at the expansion valve. Always install a new drier every time the sealed refrigeration system is opened. Do not replace the drier until after all other repair or replacement has been made. 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 apron panel, then remove the left side panel. 3) Recover the refrigerant and store it in an approved container. 4) Disconnect the drip tray hose from the tee. Remove the four screws securing the drip tray, then remove the drip tray and hose. 5) Remove the insulation and the expansion valve bulb on the suction line. 6) Remove the expansion valve cover and disconnect the expansion valve. 7) Place the new expansion valve in position. 8) Remove the drier, then place the new drier in position. 9) Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG. CAUTION Always protect the valve body by using a damp cloth to prevent the valve from overheating. Do not braze with the valve body exceeding 250°F (121°C). 10) Use an electronic leak detector or soap bubbles to check for leaks. Add a trace of refrigerant to the system (if using an electronic leak detector), and then raise the pressure using nitrogen gas (140 PSIG). DO NOT use R-404A as a mixture with pressurized air for leak testing. 11) Evacuate the system, and charge it with refrigerant. See the nameplate for the required refrigerant charge. 12) Attach the expansion valve bulb to the suction line in the same location as the previous bulb. The bulb should be at the 12 o'clock position on the tube. Be sure to secure the bulb with the clamp and holder and to insulate it. 13) Place the expansion valve cover in position. 14) Replace the drip tray and drip tray hose in their correct positions. Secure the hose to the tee. Pour water into the drip tray and check for leaks. 15) Move the power switch to the "ON" position, then replace the panels in their correct positions. 16) Turn on the power supply, then move the control switch to the "ICE" position to start the automatic icemaking process. 49 D. Removal and Replacement of Evaporator Assembly Components CAUTION Make sure the extruding head heater is installed and connected after service. Evaporator Assembly Spout A Cutter Spout B Extruding Head Heater Power Switch Extruding Head and Upper Bearing Auger Pin Auger Control Switch Evaporator Bracket Dispense Mode Switch Allen Head Cap Screw Washer Allen Head Cap Screw with Washer Evaporator Mechanical Seal O-Ring Hex Head Bolt with Washer Housing and Lower Bearing Barrier Fig. 1 Gear Motor 50 Spline Coupling 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. 2. 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 front cover of the storage bin. Remove spout B, .02" Round Stock then remove spout A and the cutter. See Fig. 1. or Pin Gauge 3) Grasp the top of the auger and move Auger the auger towards you and then try to Extruding insert a .02" round stock or pin gauge in Head between the back side of the auger shaft and the bearing surface. Check several locations around 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. Fig. 2 Instructions for removing the extruding head and 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 front cover of the storage bin 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. 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 front cover of the storage bin. Remove spout B, then remove spout A and the cutter. See Fig. 1. 4) Remove the apron panel, then remove the left side panel. 5) Remove the extruding head heater, then remove the allen head cap screws and lift off the extruding head. 6) Place the new extruding head in place and tighten down the allen head cap screws. 7) Replace the extruding head heater and cutter in their correct positions. 51 8) Replace spout A, spout B, and the front cover of the storage bin 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. 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 front cover of the storage bin. Remove spout B, then remove spout A. See Fig. 1. 4) Remove the apron panel, then remove the left side panel. 5) Remove the extruding head heater, then remove the allen head cap screws securing the extruding head. 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. 7) Install the new auger assembly with the upper part of the mechanical seal attached and tighten down the allen head cap screws. 8) Replace the extruding head heater in its correct position. 9) Replace spout A, spout B, and the front cover of the storage bin 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. 4. Removal and Replacement of Evaporator IMPORTANT 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. 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. 52 3) Remove the apron panel, then remove the left side panel. 4) Recover the refrigerant and store it in an approved container. 5) Disconnect the drip tray hose from the tee. Remove the four screws securing the drip tray, then remove the drip tray and hose. 6) Remove the front cover of the storage bin. Remove spout B, then remove spout A. See Fig. 1. 7) Remove the extruding head heater, then remove the allen head cap screws securing the extruding head. Using the cutter, lift out the auger assembly. 8) Remove the evaporator bracket and disconnect the water hoses. 9) Disconnect the inlet and outlet tubing. 10) Remove the allen head cap screws securing the evaporator to the lower housing. 11) Lift off the evaporator. 12) 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. 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. 13) 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. 14) Remove the drier, then place the new drier in position. 15) Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG. 16) 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. 17) Evacuate the system, and charge it with refrigerant. See the nameplate for the required refrigerant charge. 18) Install the auger assembly with the upper part of the mechanical seal attached and tighten down the allen head cap screws. 19) Replace the evaporator bracket and reconnect the water hoses. 20) Replace spout A, spout B, and the front cover of the storage bin in their correct positions. 21) Replace the drip tray and drip tray hose in their correct positions. Secure the hose to the tee. Pour water into the drip tray and check for leaks. 22) Move the power switch to the "ON" position, then replace the panels in their correct positions. 23) Turn on the power supply, then move the control switch to the "ICE" position to start the automatic icemaking process. 53 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 the front cover of the storage bin. Remove spout B, then remove spout A. See Fig. 1. 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. 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. If the contact surfaces of these two 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. CAUTION 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 "V.D.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. 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. 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. 54 18) Move the 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 front cover of the storage bin. Remove spout B, then remove spout A. See Fig. 1. 4) Remove the apron panel, then remove the left side panel. 5) Remove the evaporator bracket. 6) Remove the bolts securing the lower housing to the gear motor. Lift the evaporator up slightly. 7) Remove the gear motor/drain pan bolts. See Fig. 3. 8) Disconnect the wiring from the gear motor, then remove the gear motor from the drain pan. 9) Remove the gear motor bracket from the old gear motor and attach to the new gear motor. 10) Remove the spline coupling and gear motor cover from the old gear motor and attach to the new gear motor. The narrow side of the gear motor cover should be towards the evaporator. After tightening the mounting screws, apply silicone caulk to the heads to seal them. 11) Place the new gear motor in the drain pan. 12) Using the gear motor/drain pan bolts and washers, secure the gear motor and drain pan to the drain pan bracket. Gear Motor Cover Screws Gear Motor Cover Gear Motor Gear Motor/Drain Pan Bolts and Washers Gear Motor Bracket Gear Motor Bracket Bolts 13) Connect the gear motor wires. 14) Lower the evaporator down and secure it to the gear motor. 15) Replace the evaporator bracket in its correct position. Drain Pan Drain Pan Bracket Bolts Drain Pan Bracket 16) Replace spout A, spout B, and the front cover of the storage bin in their correct positions. 55 Fig. 3 17) Move the power switch to the "ON" position, then replace the panels in their correct positions. 18) Turn on the power supply, then move the control switch to the "ICE" position to start the automatic icemaking process. E. Removal and Replacement of Self-Contained Air-Cooled Condenser IMPORTANT Always install a new drier every time the sealed refrigeration system is opened. Do not replace the drier until after all other repairs or replacement have been made. 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 apron panel, then remove the left side panel. 3) Recover the refrigerant and store it in an approved container. 4) Disconnect the drip tray hose from the tee. Remove the four screws securing the drip tray, then remove the drip tray and hose. 5) Remove the four bolts securing the fan motor assembly to the floor of the machine, then move the assembly to the side. 6) Disconnect the condenser inlet and outlet piping. 7) Remove the screws securing the condenser assembly, then remove the assembly. 8) Remove the shroud from the old condenser and attach it to the new condenser. 9) Install the new condenser. 10) Remove the drier, then place the new drier in position. 11) Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG. 12) Use an electronic leak detector or soap bubbles to check for leaks. Add a trace of refrigerant to the system (if using an electronic leak detector), and then raise the pressure using nitrogen gas (140 PSIG). DO NOT use R-404A as a mixture with pressurized air for leak testing. 13) Evacuate the system, and charge it with refrigerant. See the nameplate for the required refrigerant charge. 14) Replace the fan motor assembly in its correct position. 15) Replace the drip tray and drip tray hose in their correct positions. Secure the hose to the tee. Pour water into the drip tray and check for leaks. 16) Move the power switch to the "ON" position, then replace the panels 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. 56 F. Removal and Replacement of Water-Cooled Condenser IMPORTANT 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. 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 apron panel, then remove the left side panel. 3) Recover the refrigerant and store it in an approved container. 4) Disconnect the drip tray hose from the tee. Remove the four screws securing the drip tray, then remove the drip tray and hose. 5) Close the condenser water supply line shut-off valve, then open the condenser water supply line drain valve. 6) Attach a compressed air or carbon dioxide supply to the condenser water supply line drain valve. 7) 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. 8) Disconnect the condenser water inlet and outlet piping and the refrigeration inlet and outlet piping at the condenser. 9) Remove the old condenser and install the new condenser. 10) Remove the drier, then place the new drier in position. 11) Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG. 12) Use an electronic leak detector or soap bubbles to check for leaks. Add a trace of refrigerant to the system (if using an electronic leak detector), and then raise the pressure using nitrogen gas (140 PSIG). DO NOT use R-404A as a mixture with pressurized air for leak testing. 13) Evacuate the system, and charge it with refrigerant. See the nameplate for the required refrigerant charge. 14) Close the condenser water supply line drain valve, then open the condenser water supply line shut-off valve. 15) Check for water leaks. 16) Replace the drip tray and drip tray hose in their correct positions. Secure the hose to the tee. Pour water into the drip tray and check for leaks. 17) Move the power switch to the "ON" position, then replace the panels in their correct positions. 18) Turn on the power supply, then move the control switch to the "ICE" position to start the automatic icemaking process. 57 G. Removal and Replacement of Water Regulating Valve ‑ Water‑Cooled Model Only IMPORTANT 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. 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 apron panel, then remove the left side panel. 3) Recover the refrigerant and store it in an approved container. 4) Disconnect the drip tray hose from the tee. Remove the four screws securing the drip tray, then remove the drip tray and hose. 5) Close the condenser water supply line shut-off valve, then open the condenser water supply line drain valve. 6) Attach a compressed air or carbon dioxide supply to the condenser water supply line drain valve. 7) 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. 8) Disconnect the capillary tube at the condenser outlet. 9) Disconnect the flare-connections of the valve. 10) Remove the screws and the valve from the bracket. 11) Install the new valve. 12) Remove the drier, then place the new drier in position. 13) Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG. 14) Use an electronic leak detector or soap bubbles to check for leaks. Add a trace of refrigerant to the system (if using an electronic leak detector), and then raise the pressure using nitrogen gas (140 PSIG). DO NOT use R-404A as a mixture with pressurized air for leak testing. 15) Evacuate the system, and charge it with refrigerant. See the nameplate for the required refrigerant charge. 16) Connect the flare-connections. 17) Close the condenser water supply line drain valve, then open the condenser water supply line shut-off valve. 18) Check for water leaks. 19) Replace the drip tray and drip tray hose in their correct positions. Secure the hose to the tee. Pour water into the drip tray and check for leaks. 58 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. H. Adjustment of Water Regulating Valve - Water-Cooled Model Only The water regulating valve (also called "water regulator") is factory-adjusted. No adjustment is required under normal use. Adjust the water regulator, if necessary, using the following procedures. 1) Prepare a thermometer to check the condenser drain temperature. Attach a pressure gauge to the high-side line of the system. Adjustment Screw 2) Five minutes after a freeze cycle starts, confirm that the thermometer reads 104°F CW – Higher to 115°F (40°C to 46°C). If it does not, CCW – Lower rotate the adjustment screw by using a flat blade screwdriver until the temperature Top View is in the proper range. See Fig. 4. Next, check that the reference pressure is in the range indicated in the Head Pressure table in the Performance Data section. If it is not Fig. 4 in the proper range, verify the refrigerant charge. 3) Check that the condenser drain temperature is stable. I. Removal and Replacement of Fan Motor 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 apron panel. 3) Disconnect the wire connectors from the fan motor leads. 4) Remove the fan motor bracket. 5) Remove the fan blade and install it onto the new fan motor. 6) Install the new fan motor onto the fan motor bracket. 7) Replace the fan motor bracket in its correct position and reconnect the wire connectors. 8) Move the power switch to the "ON" position, then replace the panels in their correct positions. 9) Turn on the power supply, then move the control switch to the "ICE" position to start the automatic icemaking process. 59 J. Removal and Replacement of Inlet or Dispensing Water Valve 1) Close the water supply line shut-off valve. 2) Open the water supply line drain valve. 3) 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. 4) Remove the apron panel. For the inlet water valve, remove the left side panel. For the dispensing water valve, remove the right side panel. 5) Disconnect the wire terminals from the water valve. 6) Loosen the fitting nut on the water valve. Do not lose the washer inside the fitting nut. 7) Remove the water valve bracket (inlet water valve) or water valve (dispensing water valve). 8) Remove the old water valve and install the new water valve. Remove the supply hose from the old water valve and place on the new water valve. 9) Replace the water valve bracket (inlet water valve) or water valve (dispensing water valve) in its correct position. 10) Reconnect the wire terminals. 11) Reconnect the fitting nut on the water valve. Make sure the washer is in place in the fitting nut. 12) Close the water supply line drain valve and open the water supply line shut-off valve. 13) Check for water leaks. 14) Move the power switch to the "ON" position, then replace the panels in their correct positions. 15) Turn on the power supply, then move the control switch to the "ICE" position to start the automatic icemaking process. K. Removal and Replacement of Drain Valve 1) Close the water supply line shut-off valve. 2) 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 the right and left side panels. Next, remove the rear panel. 4) Prepare a container to catch water from the reservoir and evaporator, then disconnect the hose from the drain valve and allow all of the water from the reservoir and evaporator to drain into the container. 5) Disconnect the wire terminals from the drain valve. 6) Remove the drain valve bracket. 7) Remove the old drain valve and install the new drain valve. 8) Replace the drain valve bracket in its correct position. 9) Reconnect the wires and hoses. 60 10) Open the water supply line shut-off valve. 11) Turn on the power supply, move the power switch to the "ON" position, then replace the front panel in its correct position to engage the door switch. Move the control switch to the "ICE" position. 12) Allow the icemaker to fill for two minutes. 13) Move the control switch to the "OFF" position. 14) Remove the front panel and check for water leaks. 15) Move the control switch to the "DRAIN" position. Engage the door switch and make sure that water is draining and that there are no water leaks around the hose connection. 16) Move the control switch to the "OFF" position and disengage the door switch. 17) Replace the panels in their correct positions. 18) Move the control switch to the "ICE" position to start the automatic ice making process. L. Removal and Replacement of Dispensing System 1. Dispensing 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 front cover of the storage bin. 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 dispensing auger/agitator to prevent it from dropping when sliding back the motor. See Fig. 5. 4) Replace the dispensing 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. Dispensing or Agitating Motor 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 front panel. 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 dispensing auger/agitator to prevent it from dropping when sliding back the motor. See Fig. 5. 4) Remove the thumbscrews from the horizontal plane of the motor bracket. 5) Remove the motor from the bracket. 61 6) Install the new motor. 7) Assemble the removed parts in the reverse order of which they were removed. 8) Move the power switch to the "ON" position, then replace the panels in their correct positions. 9) Turn on the power supply, then move the control switch to the "ICE" position to start the automatic icemaking process. Agitator Agitating Motor Dispensing Motor Dispensing Auger Fig. 5 62 VI. Cleaning and Maintenance IMPORTANT Ensure all components, fasteners, and thumbscrews are securely in place after any cleaning or maintenance is done to the equipment. A. Cleaning and Sanitizing Instructions HOSHIZAKI recommends cleaning this unit at least twice a year. More frequent cleaning, however, may be required in some existing water conditions. WARNING 1. To prevent injury to individuals, do not use any ammonia type cleaners. 2. Carefully follow any instructions provided with the bottles of cleaning and sanitizing solution. 3. Always wear liquid-proof gloves to prevent the cleaning and sanitizing solutions from coming into contact with skin. 4. After cleaning, do not use ice made from the cleaning and sanitizing solutions. Be careful not to leave any solution on the parts or in the storage bin. Extruding Head Spout A Spout B Evaporator Assembly Reservoir Power Switch Agitator Dispensing Auger Control Switch Dispense Mode Switch Dispensing Motor Agitating Motor Fig. 6 63 1. Water System a) Cleaning Solution Dilute 9.6 fl. oz. (0.29 l) of Hoshizaki "Scale Away" with 1.6 gal. (6.0 l) of warm water. b) Cleaning Procedure 1) Close the water supply line shut-off valve. 2) Move the dispense mode switch to the "CONTINUOUS" position, then dispense all of the ice from the storage bin. 3) Move the control switch to the "DRAIN" position and allow the water system to drain for 5 minutes. Note: If the unit is running, the drain valve will not open until 2.5 minutes after the control switch is moved to the "DRAIN" position. This allows the components to cycle down. 4) 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. 5) Remove the front cover of the storage bin. Remove spout B, then remove spout A. See Fig. 6. 6) Pour the cleaning solution over the extruding head until the evaporator assembly and the reservoir are full and the solution starts to overflow into the drain pan. Note: If there is excess scale on the extruding head, fill the evaporator assembly and reservoir as described above, then use a clamp on the reservoir hose between the reservoir and evaporator assembly to block flow. Pour additional cleaning fluid over the extruding head until the evaporator assembly is completely full. 7) Replace spout A, spout B, and the front cover of the storage bin in their correct positions. 8) Allow the icemaker to sit for about 10 minutes before operation. If you placed a clamp on the reservoir hose in step 6, remove it before operation. 9) Move the power switch to the "ON" position and replace the panels in their correct positions. Turn on the power supply, then move the control switch to the "ICE" position. Make ice using the solution until the icemaker stops making ice. Note: This unit will not run without the front panel in position. 10) Move the control switch to the "DRAIN" position and allow the solution to drain for 5 minutes. 11) Move the control switch to the "ICE" position. Open the water supply line shut-off valve to supply water to the reservoir. 12) After the gear motor starts, move the control switch to the "DRAIN" position and allow the water system to drain for 5 minutes. Note: If you do not sanitize the unit, move the control switch to the "ICE" position after the water system drains. Allow the icemaker to run for about 30 minutes, then move the control switch to the "OFF" position. Turn off the power supply, then remove the front panel and front cover of the storage bin. Go to step 12 in "IV. A.2.c) Cleaning and Sanitizing Procedure." 64 13) Move the control switch to the "OFF" position, then turn off the power supply. 14) Close the water supply line shut-off valve. c) Sanitizing Solution Dilute 0.82 fl. oz. (25 ml) of a 5.25% sodium hypochlorite solution (chlorine bleach) with 1.6 gal. (6.0 l) of warm water. d) Sanitizing Procedure - Following Cleaning Procedure 1) Make sure the control switch is in the "OFF" position, the power supply is off, and the water supply line shut‑off valve is closed. 2) Remove the front and top panels, then move the power switch to the "OFF" position. 3) Remove the front cover of the storage bin. Remove spout B, then remove spout A. 4) Pour the sanitizing solution over the extruding head until the evaporator assembly and the reservoir are full and the solution starts to overflow into the drain pan. 5) Replace spout A, spout B, and the front cover of the storage bin in their correct positions. 6) Allow the icemaker to sit for about 10 minutes before operation. 7) Move the power switch to the "ON" position and replace the panels in their correct positions. Turn on the power supply, then move the control switch to the "ICE" position. Make ice using the solution until the icemaker stops making ice. 8) Move the control switch to the "DRAIN" position and allow the solution to drain for 5 minutes. 9) Move the control switch to the "ICE" position. Open the water supply line shut-off valve to supply water to the reservoir. 10) After the gear motor starts, move the control switch to the "DRAIN" position and allow the water system to drain for 5 minutes. 11) Move the control switch to the "ICE" position to start the automatic icemaking process. Allow the icemaker to run for about 30 minutes, then clean and sanitize the dispensing components as outlined below. 2. Dispensing Components Perform after cleaning and sanitizing the water system as outlined above. a) Cleaning Solution Dilute 9.6 fl. oz. (0.29 l) of recommended cleaner, Hoshizaki "Scale Away" with 1.6 gal. (6.0 l) of warm water. b) Sanitizing Solution Dilute 0.82 fl. oz. (25 ml) of a 5.25% sodium hypochlorite solution (chlorine bleach) with 1.6 gal. (6.0 l) of warm water. c) Cleaning and Sanitizing Procedure 1) Move the control switch to the "OFF" position, then turn off the power supply. 2) Remove the front and top panels, then move the power switch to the "OFF" position. 65 3) Remove the front cover of the storage bin. 4) Remove the motor bracket thumbscrews, first from the vertical plane and then from the horizontal plane. While holding on to the corresponding agitator or auger, move the agitating motor or the dispensing motor towards you. Remove the agitator and the dispensing auger from the storage bin. See Fig. 6. 5) Remove the bin control assembly. See Fig. 7. 6) Remove the snap pin, shaft, and actuator. 7) Remove spout B, spout A, and their gaskets. 8) Remove the spout cover, ice dispensing spout, and water dispensing nozzle. See Fig. 8. 9) Immerse the agitator, dispensing auger, and parts removed in steps 5 through 8 in the cleaning solution and then in the sanitizing solution for about 15 minutes each. Rinse the parts thoroughly with clean water. 10) Wipe the shutter located above the ice dispensing spout thoroughly with a clean cloth. 11) Reassemble the bin control assembly and replace all parts in the reverse order of which they were removed. 12) Pour warm water into the storage bin and melt any remaining ice. Clean the storage bin liner and the front cover of the storage bin using a neutral cleaner. Rinse thoroughly after cleaning. Replace the front cover of the storage bin in its correct position. 13) Move the power switch to the "ON" position and replace the panels in their correct positions. Turn on the power supply, then move the control switch to the "ICE" position to start the automatic icemaking process. Bin Control Bracket Snap Pin Water Dispensing Nozzle Shaft Ice Dispensing Spout Spout Cover Actuator Fig. 7 Fig. 8 66 B. Maintenance This icemaker must be maintained individually, referring to the instruction manual and labels provided with the icemaker. The schedule below is a guideline. More frequent maintenance, however, may be required depending on water quality, the icemaker's environment, and local sanitation regulations. Consult with your local distributor about inspection and maintenance service. To obtain the name and phone number of your local distributor, visit www.hoshizaki.com or call Hoshizaki Technical Support at 1‑800‑233-1940 in the USA. WARNING 1. Only qualified service technicians should attempt to service or maintain this icemaker. 2. Disconnect power before performing maintenance. Maintenance Schedule Frequency Area Task Every 2 Weeks Monthly Air Filter Inspect. Wash with warm water and neutral cleaner if dirty. External Water Filters Icemaker Exterior Check for proper pressure and change if necessary. Every 6 Months Yearly Icemaker and Storage Bin Evaporator Condensate Drain Pan and Gear Motor Drain Pan Icemaker and Bin Drains Inlet Water Valve and Drain Valve Water Hoses Condenser Icemaker Upper Bearing (extruding head) After Upper Bearing 3 Years, (extruding head); then Yearly Lower Bearing and O-Ring (lower housing); Mechanical Seal; Evaporator Cylinder; Auger Wipe down with a clean, soft cloth. Use a damp cloth containing a neutral cleaner to wipe off oil or dirt build up. Clean any chlorine staining (rust colored spots) using a non-abrasive cleaner like Zud or Bon Ami. Clean and sanitize per the cleaning and sanitizing instructions provided in this manual. Wipe down with a clean cloth and warm water. Slowly pour one cup of sanitizing solution (prepare as outlined in the sanitizing instructions in this manual) into the evaporator 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. Check to make sure they are clear. Close the water supply line shut‑off valve and drain the water system. Clean the inlet water valve screen and clean and inspect the drain valve. Inspect the water hoses and clean/replace if necessary. Inspect. Clean if necessary by using a brush or vacuum cleaner. Inspect for oil spots, loose components, fasteners, and wires. Check for wear using .02" round stock or pin gauge. Replace both upper bearing and lower bearing if wear exceeds factory recommendations. See the Service Manual for details. Inspect. Replace both upper bearing and lower bearing if wear exceeds factory recommendations. Replace the mechanical seal if the seal's contact surfaces are worn, cracked, or scratched. 67 C. Preparing the Icemaker for Long Storage CAUTION When the icemaker 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 icemaker for extended time or in sub-freezing temperatures, turn the water off and drain out all water from the water lines and remove the ice from the storage bin. The storage bin should be cleaned and dried. Drain the icemaker water hoses using air or carbon dioxide to prevent damage at sub‑freezing temperatures. 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 dispenser water supply line shut-off valve and open the icemaker/water dispenser water supply line drain valve. 2) Move the dispense mode switch to the "CONTINUOUS" position, then dispense all of the ice from the storage bin. 3) Move the control switch to the "DRAIN" position and allow the water system to drain for 5 minutes. Note: If the unit is running, the drain valve will not open until 2.5 minutes after the control switch is moved to the "DRAIN" position. This allows the components to cycle down. 4) Attach a compressed air or carbon dioxide supply to the icemaker/water dispenser 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 "ICE" position to open the inlet water valve and briefly blow out the valve. After blowing out the inlet water valve, move the control switch to the "OFF" position. 6) Close the icemaker/water dispenser 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 front cover of the storage bin. Clean the storage bin liner and the front cover of the storage bin using a neutral cleaner. Rinse thoroughly after cleaning. Replace the front cover of the storage bin 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. 68 2. On water-cooled model only, remove the water from the water-cooled condenser: 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 and open the condenser water supply line drain valve. 3) Attach a compressed air or carbon dioxide supply to the condenser water supply line drain valve. 4) 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. 5) Close the condenser water supply line drain valve. 6) Replace the panels in their correct positions. 69
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