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Service Manual

1. 57 1 KMD 460MAH 57 2 KMD 460MW M 58 2 KMPS3OMAR aon Batan HM 59 SM KMD 530M W FTMTTT 60 5 KMD530MR M MEME HR 61 SM OUEST 62 Nem Y 63 8EKMI 35 64 BOA Fi 65 66 B CUL MW mn asa mata aa 67 MAH oom 68 ped KM CH UU cT cO 69 14 e 70 Pe Wing Diagram pen kas 71 1 Operation with Thermostatic Bin Control and without Harvest Pump Timer 71 a KML 250M KML 351MWH 451 _ eene 71 b KML 631MAH KML 631MWH 72 mna sn 73 2 Harvest Pump Timer Operation with Thermostatic or Mechanical Control 74 a KML 351MAH KMD 460M 530 0 0 04222222 2 2 74 b KML 631MAH KML 631MWH oom mmoom ooco o omooommomomh 75 KML 631MRH C 1 to 0 0 No Crankcase Heater Relay 76 d KML 631MRH D 1 and Later Crankcase Heater Relay 77 Important Safety Information Throughout this manual notices appear to bring your attention to situations w
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6. Condenser Inspect Clean if necessary by using a brush or vacuum cleaner More frequent cleaning may be required depending on location Inspect the water hoses and clean replace if necessary Yearly Icemaker and Clean and sanitize per the cleaning and sanitizing instructions provided Dispenser Unit Ice in the instruction manual or maintenance label on the icemaker Storage Bin Liner system Clean the water supply inlet screen 53 VI Preparing the Appliance for Periods of Non Use NOTICE When storing the appliance for an extended time or in sub freezing temperatures follow the instructions below to prevent damage The pump motor is energized continuously when the control switch is in the SERVICE position When the appliance is not used for two or three days under normal conditions it is sufficient to move the control switch to the OFF position When storing the appliance for an extended time or in sub freezing temperatures follow the instructions below 1 Remove the water from the icemaker water line 1 Turn off the power supply then remove the front panel 2 Move the control switch on the control box to the OFF position 3 Close the icemaker water supply line shut off valve then open the icemaker water supply line drain valve 4 Allow the line to drain by gravity 5 Attach compressed air or carbon dioxide supply to the icemaker water supply line drain valve 6 Move the control switch to the
7. D 1 and Later Heater Relay TOISIH3HL 77
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10. 1 Ib 8 7 oz 7009 Performance Data Sheet APPROXIMATE ICE PRODUCTION AMBIENT TEMP WATER TEMP F C PER 24 50 10 70 21 90 32 70 21 2 80 27 90 32 Ibs day kg day 100 38 APPROXIMATE ELECTRIC 70 21 CONSUMPTION 80 27 90 32 watts 100 38 APPROXIMATE WATER 70 21 CONSUMPTION PER 24 HR 80 27 90 32 gal day m day 100 38 FREEZING CYCLE TIME 70 21 80 27 90 32 100 38 70 21 80 27 90 32 100 38 HEAD PRESSURE 70 21 80 27 90 32 PSIG kg cm G 100 38 SUCTION PRESSURE 70 21 80 27 90 32 PSIG kg cm G 100 38 TOTAL HEAT OF REJECTION FROM CONDENSER 7 300 BTU h AT 90 F 32 WT 70 F 21 C 66 11 KML 451MWH Specification Sheet AC SUPPLY VOLTAGE AMPERAGE MINIMUM CIRCUIT AMPACITY MAXIMUM FUSE SIZE ELECTRIC amp WATER CONSUMPTION ELECTRIC W KWH 100 Ibs POTABLE WATER gal 24HR gal 100 Ibs WATER COOLED CONDENSER gal 24HR gal 100 Ibs ICE PRODUCTION PER CYCLE BIN CONTROL SYSTEM REFRIGERANT CHARGE Performance Data Sheet APPROXIMATE ICE PRODUCTION PER 24 HR Ibs day kg day APPROXIMATE ELECTRIC CONSUMPTION APPROXIMATE WATER CONSUMPTION PER 24 HR gal day m day FREEZING CYCLE TIME HEAD PRESSURE PSIG kg cm G SUCTION PRESSURE PSIG kg cm G 115 60 1 9 8 5 Min Freeze 104 F WT 80 F 20A 20A 90 70 F 70 50 F 950 5 5 920 5 3 87 20 9 124 29 9 432 104 234 57 7 2 Ibs 3 3 kg 360pcs Thermostatic Bin Control R404A 0
11. 32 C WT 70 F 21 C TOTAL HEAT OF REJECTION FROM COMPRESSOR 1 400 BTU h AT 90 F 32 C WT 70 F 21 C WATER FLOW FOR CONDENSER 68 6 gal h AT 100 F 38 C WT 90 F 32 69 14 KML 631MRH Specification Sheet AC SUPPLY VOLTAGE 208 230 60 1 3 wire with neutral for 115V AMPERAGE 7 6 A 5 Min Freeze AT 104 F WT 80 F MINIMUM CIRCUIT AMPACITY 20A MAXIMUM FUSE SIZE 20A ELECTRIC amp WATER CONSUMPTION 90 70 70 50 F ELECTRIC W kWH 100 lbs 1310 5 3 1170 4 4 WATER gal 24HR gal 100 Ibs 96 16 0 190 29 5 ICE PRODUCTION PER CYCLE 10 7 Ibs 4 8 kg 480 pcs BIN CONTROL SYSTEM Thermostatic Bin Control CONDENSER Air Cooled Remote Condenser Unit URC 9F REFRIGERANT CHARGE R404A 9 Ib 8 4 oz 43209 Icemaker 5 Ib 9 6 oz Cond Unit 3 Ib 14 8 oz Performance Data Sheet APPROXIMATE ICE PRODUCTION AMBIENT TEMP WATER TEMP F C 24 HR F C 50 10 70 21 90 32 70 21 80 27 90 32 Ibs day kg day 100 38 APPROXIMATE ELECTRIC 70 21 CONSUMPTION 80 27 90 32 watts 100 38 APPROXIMATE WATER 70 21 CONSUMPTION PER 24 HR 80 27 90 32 gal day m day 100 38 FREEZING CYCLE TIME 70 21 80 27 90 32 100 38 HARVEST CYCLE TIME 70 21 80 27 90 32 100 38 HEAD PRESSURE 70 21 80 27 90 32 PSIG 26 100 38 SUCTION PRESSURE 70 21 80 27 90 32 PSIG kg cm G 100 38 TOTAL HEAT OF REJECTION FROM CONDENSER 9 100 BTU h AT 90 F 32 WT 70 F 219 TOTAL HEAT
12. 44 2 Harvest Timer S4 dip switch 1 amp 2 The harvest timer starts counting when the thermistor reaches 48 F 9 C at the evaporator outlet and the control board reads 3 9 kO from the thermistor The harvest timer is factory set and generally no adjustment is required However a setting longer than the factory setting may be advised in cases where the drain provided at harvest needs to be prolonged for extra cleaning Before changing this setting contact Hoshizaki Technical Support at 1 800 233 1940 for recommendations Keep in mind that setting the harvest timer to a longer setting decreases 24 hour production Note that the pump out timer S4 dip switch 3 amp 4 acts in place of the harvest timer during cycles with a pump out For details see 3 Pump Out Timer S4 dip switch 3 amp 4 Note On models with a pump out every cycle the harvest timer is only relevant during the initial harvest cycle since a pump out occurs every cycle thereafter S4 Dip Switch Setting Time see s 3 Pump Out Timer S4 dip switch 3 amp 4 NOTICE On models with harvest pump timer do not adjust 3 off and 4 on Drain valve does not energize in this setting The pump motor stops for 2 seconds then the X12 relay energizes allowing the pump motor and drain valve to energize Water is removed from the bottom of the water tank and sent down the drain The pump out drains the wa
13. AC SUPPLY VOLTAGE 115 60 1 7 4 A 5 Min Freeze AT 104 F WT 80 F MINIMUM CIRCUIT AMPACITY 20A MAXIMUM FUSE SIZE 20A ELECTRIC amp WATER CONSUMPTION 90 70 F 70 50 F ELECTRIC W kWH 100 Ibs 750 6 4 70 21 0 0 WATER gal 24HR gal 100 Ibs 57 20 3 10 0 0 ICE PRODUCTION PER CYCLE 8 Ibs 3 6 kg 360pcs BIN CONTROL SYSTEM Thermostatic Bin Control REFRIGERANT CHARGE R404A 1 Ib 9 4 oz 720g Performance Data Sheet APPROXIMATE ICE PRODUCTION PER AMBIENT TEMP WATER TEMP F C 24 HR CFC 50 10 70 21 90 32 70 21 80 27 90 32 Ibs day kg day 100 38 APPROXIMATE ELECTRIC 70 21 CONSUMPTION 80 27 90 32 watts 100 38 APPROXIMATE WATER 70 21 CONSUMPTION PER 24 HR 80 27 90 32 gal day m day 100 38 FREEZING CYCLE TIME 70 21 80 27 90 32 100 38 70 21 80 27 90 32 100 38 HEAD PRESSURE 70 21 80 27 90 32 PSIG kg cm G 100 38 SUCTION PRESSURE 70 21 80 27 90 32 PSIG kg cm G 100 38 TOTAL HEAT OF REJECTION FROM CONDENSER 6 600 BTU h AT 90 F 32 WT 70 F 21 C 64 9 KML 351MWH Specification Sheet AC SUPPLY VOLTAGE AMPERAGE MINIMUM CIRCUIT AMPACITY MAXIMUM FUSE SIZE ELECTRIC amp WATER CONSUMPTION 90 70 ELECTRIC W KWH 100 lbs WATER gal 24HR gal 100 Ibs WATER COOLED CONDENSER gal 24HR gal 100 Ibs ICE PRODUCTION PER CYCLE BIN CONTROL SYSTEM REFRIGERANT CHARGE Performance Data Sheet APPROXIMATE ICE PRODUCTION PER 24 HR Ibs day kg day A
14. CB red POWER OK LED and green BC CLOSED LED turn on If yellow BC OPEN LED is on indicating missing or loose jumper 4A4883G01 check that the jumper is securely in place Move ice away from TBC bulb If yellow BC OPEN LED stays on see II D 1 Thermostatic Bin Control TBC Check NOTICE Do not adjust S4 dip switch 7 out of the factory default position This dip switch must be left in the factory default position or the appliance will not operate correctly Note CB red POWER LED remains on unless the 10 5VAC power supply is interrupted K2 connector a Power On Diagnosis If CB red POWER OK LED is off confirm 10A fuse is good Check for 115VAC at control switch 2 BR to neutral W then at control switch 3 P to neutral W If 115VAC is present on 2 BR and not on 3 P replace control switch If 115VAC is present on control switch 3 P check for 115VAC at HPS P to neutral W then HPS BK to neutral W If 115VAC is present at HPS P and not at HPS BK HPS is open See HPS Diagnosis below If 115VAC is present at HPS BK check for 10 5VAC at CB K2 1 to CB K2 2 R If 10 5VAC is not present check CT continuity If open replace CT b HPS Diagnosis Check that the condenser coil is not clogged or restricted Let refrigeration circuit pressures equalize If HPS does not reset and pressures are equalized replace HPS If pressures are not equalized reclaim refrigerant and diagnose refrigeration
15. K V ribu 308033 di I Wh jT TT ous si OH Bgm penas Me V ivi re s Em 8 Ee OB LI ieee el 14 E rs c als a Y Am pu m a F epe ER 01 d M Des lam qu 33 cd mi L 3 1033104 14 1 101 un li Jy ie VB 7 4 40 19 8 N 109 391 Tel b 631 KML 631MWH DISd 612 782 DISd 8164 65 uno 2154 eiz v8 DISd 2210 mo n9 lepow UOJIMS SINSSAIg UBIH 0 55113 50 0 dH dd 40 Tr Wie n 8 dv DNI 4 XD 1 ILLIS 3189190 DNI H 1 Y ore 135 300035 01 3 T que 1 ERES jj 1 1 dis 1 4 TH Wel poem E 1 JLIHM Ow i 5 H i 21 al T wi MH 3l TL JINYHO F ig y 5 7 5 3118 wi x 1
16. day 100 38 APPROXIMATE ELECTRIC 70 21 CONSUMPTION 80 27 90 32 watts 100 38 APPROXIMATE WATER 70 21 CONSUMPTION PER 24 HR 80 27 90 32 gal day m day 100 38 FREEZING CYCLE TIME 70 21 80 27 90 32 100 38 70 21 80 27 90 32 100 38 HEAD PRESSURE 70 21 80 27 90 32 PSIG kg cm G 100 38 SUCTION PRESSURE 70 21 80 27 90 32 PSIG kg cm G 100 38 TOTAL HEAT OF REJECTION FROM CONDENSER 7 700 BTU h 90 F 32 C WT 70 F 219 57 2 KMD 460MWH Specification Sheet AC SUPPLY VOLTAGE 115 60 1 AMPERAGE 8 5A 5 Min Freeze AT 104 F WT 80 F MINIMUM CIRCUIT AMPACITY 15A MAXIMUM FUSE SIZE 15A ELECTRIC amp WATER CONSUMPTION 90 70 70 50 ELECTRIC W kWH 100 lbs 800 4 11 770 3 67 WATER gal 24HR gal 100 Ibs 79 16 9 141 28 0 WATER COOLED CONDENSER 639 136 303 60 gal 24HR gal 100 Ibs ICE PRODUCTION PER CYCLE 9 4 Ibs 4 3 432pcs BIN CONTROL SYSTEM Mechanical Bin Control REFRIGERANT CHARGE R404A 0 Ib 14 1 oz 4009 Performance Data Sheet APPROXIMATE ICE PRODUCTION AMBIENT TEMP WATER TEMP F C PER 24 HR CFC 50 10 70 21 90 32 70 21 80 27 90 32 Ibs day kg day 100 38 APPROXIMATE ELECTRIC 70 21 CONSUMPTION 80 27 90 32 watts 100 38 APPROXIMATE WATER 70 21 CONSUMPTION PER 24 HR 80 27 90 32 gal day m day 100 38 FREEZING CYCLE TIME 70 21 80 27 90 32 100 38 70 21 80 27 90 32 100 38 HEAD PRESSURE 70 21 80 27 90 32 PSIG kg cm G 100 38 SU
17. Ib 15 2 oz 430g AMBIENT TEMP WATER TEMP F C F C 50 10 70 21 90 32 70 21 80 27 90 32 100 38 70 21 80 27 90 32 100 38 70 21 80 27 90 32 100 38 70 21 80 27 90 32 100 38 70 21 80 27 90 32 100 38 70 21 80 27 90 32 100 38 TOTAL HEAT OF REJECTION FROM CONDENSER 7 300 BTU h AT 90 F 32 C WT 70 F 21 C TOTAL HEAT OF REJECTION FROM COMPRESSOR 1 300 BTU h AT 90 F 32 C WT 70 F 21 C WATER FLOW FOR CONDENSER PRESSURE DROP OF COOLING WATER LINE 43 gal h AT 100 F 38 C WT 90 F 32 C less than 10 PSIG 67 12 KML 631MAH Specification Sheet AC SUPPLY VOLTAGE 208 230 60 1 3 wire with neutral for 115V AMPERAGE 81A 5 Min Freeze AT 104 WT 80 F MINIMUM CIRCUIT AMPACITY 20A MAXIMUM FUSE SIZE 20A ELECTRIC amp WATER CONSUMPTION 90 70 F 70 50 ELECTRIC W KWH 100 165 1210 5 7 1130 4 5 WATER gal 24HR gal 100 Ibs 82 16 0 191 31 6 ICE PRODUCTION PER CYCLE 10 5 Ibs 4 8 kg 480 pcs BIN CONTROL SYSTEM Thermostatic Bin Control REFRIGERANT CHARGE R404A 2 Ib 10 3 oz 12009 Performance Data Sheet APPROXIMATE ICE PRODUCTION PER AMBIENT TEMP WATER TEMP F C 24 HR 50 10 70 21 90 32 70 21 605 274 577 262 538 80 27 584 265 541 245 500 Ibs day kgJ day 100 38 569 258 500 227 432 APPROXIMATE ELECTRIC 70 21 CONSUMPTION 80 27 90 32 watts 100 38 APPROXIMATE WATER 70 21 CONSUMPTION PER 24 HR 80 27 90 32 gal day m day
18. P n p P ive Mechanical Bin Control and Bracket 8 Model Shown KMD 460MWH 3 Remote Air Cooled MRH Thermostatic Spray Tubes Expansion Valve Drain Valve Water Supply Inlet Cleaning Valve Hot Gas Valve Inlet Water Valve Cleaning Valve Control Box Control Switch Service Switch High Pressure Switch Pump Motor Reciever Drier Float Switch Thermostatic Bin Control Liquid Line Valve Compressor P Crankcase Heater Thermostatic Bin Control Bracket amp Bulb Holder Model Shown KML 631MRH 1 z 3 Mechanical Bin Control Ti and Bracket SEND Model Shown KMD 530MRH Water Refrigeration Circuit Diagram 1 Air Cooled Models MAH Spray Tubes Condenser Condenser Fan Motor High Pressure Inlet Water Valve Switch Drier Cleaning Valve Heat Exchanger Drain Valve Thermistor Hot Gas Valve Strainer Compressor Thermostatic Expansion Valve Refrigeration Circuit mEmEEN Water Circuit 10 2 Water Cooled Models MWH Water Regulating Valve Spray Tubes Inlet Water Valve Clean
19. Thermistor Check 16 Pump Motor Motor winding open b Bearing worn out or locked rotor C Defective capacitor 17 Thermostatic Expansion Valve Bulb loose 18 Liquid Line Valve Closed in freeze cycle Open in harvest cycle 19 Fan Motor a Motor winding open b Bearing worn out or locked rotor C Defective capacitor 20 Water System a Water leaks causing short freeze time 2 Freeze Up Defrost and clean the icemaker prior to diagnosing freeze up Fill out a freeze up checklist See the Hoshizaki America Technician s Pocket Guide or contact your local distributor for a copy of the freeze up checklist Freeze Up Possible Cause Harvest Cycle 1 Evaporator Scaled up b Damaged 2 Cube Guides 8 Out of position 3 Spray Tubas and or Spray Guides b Out of position 4 Water Supply C Insufficient water line size Minimum 1 4 Nominal ID 6 mm Nominal OD in the EU copper water tubing or equivalent 5 Inlet Water Valve Screen or orifice clogged b Defective 6 Float Switch Dirty sticking See Float Switch Check b Defective and Cleaning 7 Refrigerant Charge 8 Control Board Harvest timer S4 dip switch 1 amp 2 set too short See III C Settings and Harvest pump timer S4 dip switch 7 not in factory default position Adjustments and Control Defective Board Check 9 Bin Control Thermostatic Thermostat switch sticking See 11 0
20. check 3 b HPS Diagnosis If POWER OK LED is on check for 115VAC at CB K1 1 V or 9 V to neutral W If 115VAC is not present and LED 1 is on replace CB If 115VAC is present check for 115VAC at CR coil If 115VAC is present check CR coil and contact continuity Replace as needed If CR is okay check Comp start relay and start and run capacitors Next check Comp motor winding continuity If Comp is energized but evaporator is not cooling check for an inefficient Comp See Specification and Performance Data Sheets If Comp is energized but FMR is not check for 115VAC at the FMR junction box If 115VAC is not present check icemaker wiring connections If 115VAC is present check for voltage at condenser unit If 115VAC is not present check field wiring connections If 115VAC is present check FMR capacitor motor winding and fan blade for binding c WV and HGV Diagnosis If WV is energized check for 115VAC at K1 6 to neutral W If 115VAC is present after PM energizes in harvest cycle replace CB If 115VAC is not present replace WV bypassing If HGV did not de energize at the end of harvest check for 115VAC at CB K1 2 P to neutral W If 115VAC is present 50 sec after PM energizes replace CB If 115VAC is not present replace HGV bypassing d PM Diagnosis Confirm water is flowing over evaporator from PM and not WV If PM de energizes once freeze begins check for 115VAC at CB K1 4 to ne
21. clean Dirt dust or insects in the appliance could cause harm to individuals or damage to the appliance Additional Warning for Remote Models THE REMOTE CONDENSER UNIT MUST BE GROUNDED The power supply and ground connection to the remote condenser unit are supplied from the icemaker Failure to properly ground the remote condenser unit could result in death or serious injury Move the icemaker control switch to the OFF position and turn off the power supply to the icemaker before servicing the remote condenser unit Lockout Tagout to prevent the power supply from being turned back on inadvertently NOTICE Follow the instructions in this manual carefully to reduce the risk of costly water damage In areas where water damage is a concern install a contained area with a floor drain Install the appliance in a location that stays above freezing Normal operating ambient temperature must be within 45 F to 100 F 7 C to 3890 Do not leave the icemaker on during extended periods of non use extended absences or in sub freezing temperatures To properly prepare the icemaker for these occasions follow the instructions in VI Preparing the Appliance for Periods of Non Use Do not place objects on top of the appliance The dispenser unit ice storage bin is for ice use only Do not store anything else in the dispenser unit ice storage bin I Construction and Water Refrigeration Circuit Diagram A Cons
22. control switch to the ICE position 9 Replace the control box cover in its correct position 10 Turn on the power supply to start the automatic icemaking process 11 Replace the front panel in its correct position Legend MBC mechanical bin control CB control board Wire Harness white KMD 530M Connector MBC Bracket Switch Mount aa Actuator Paddle __________ eT Bin Control Proximity Proximity Switch b odi Switch Closed Open bin full calling for ice icemaker off or shutting down Fig 2 Magnet Model Shown KMD 530M 33 E Float Switch Check and Cleaning FS is used to determine that there is sufficient water in the water tank after the 1 min fill cycle and after each harvest cycle FS is also used to determine that the appropriate volume of water has been converted into ice before switching out of the freeze cycle No adjustment is required 1 Float Switch Check To check FS follow the steps below 1 Remove the front panel then move the control switch to the SERVICE position Move the service switch to the DRAIN position 2 Allow the water to drain from the water tank then move the control switch to the OFF position Turn off the power supply 3 Remove the control box cover 4 Disconnect FS connector from CB K5 black connector 5 Check for c
23. occur every cycle or every 2 5 or 10 cycles For details see 4 Pump Out Frequency Control S4 dip switch 5 amp 6 Pump Out Diagnosis In the freeze cycle before pump out see table above after 5 min of freeze disconnect CB black K5 connector FS connector Check that PM stops and re starts and that DV energizes and water is flowing down the drain through DV If PM does not stop and re start and DV does not energize check that CB LEDs 1 3 and 2 are on If not replace CB If LEDs 1 3 and 2 are on and PM and DV do not energize check for 115VAC at CB K1 5 DBU to neutral W If 115VAC is not present replace CB If 115VAC is present check for 115VAC at X10 relay 8 DBU to neutral W If 115VAC is present at X10 relay 8 DBU to neutral W PM Check for 115VAC at X10 relay 6 BR and X10 relay 4 Y to neutral W If 115VAC is present at X10 relay 6 BR and not at X10 relay 4 Y replace X10 relay If 115VAC is present at X10 relay 4 Y check PM capacitor motor winding and impeller for binding DV Check for 115VAC from X10 relay 5 DBU and X10 relay 3 GY to neutral W If 115VAC is present at X10 relay 5 DBU and not at X10 relay 3 GY replace X10 relay If 115VAC is present at X10 relay 3 GY check DV solenoid replace as needed Next confirm that the drain line is not clogged Confirm FM and LLV de energize If FM or LLV are energized with LEDs 1 3 and 2 on replace CB 8 Nor
24. to the OFF position 3 Remove the control box cover then clear any ice away from c muda contro MBG board K4 red 4 Check MBC wire harness connections See Fig 1 connector 5 Disconnect MBC connector from CB K4 connector 6 Check for continuity across the wires of ma KP y RC MBC connector When the actuator paddle is not engaged switch is closed e arness white If open check that the wire harness Connect r connector is properly connected and that E 72 Rr Actuator the actuator paddle is not sticking Clean if 5 necessary See II D 2 b Mechanical Bin Model Shown KMD 530M H Control Cleaning If MBC switch still reads Fig 1 open replace MBC 7 Press and hold the actuator paddle check for continuity across the wires of MBC connector When the actuator paddle is engaged MBC switch is open If closed check that the actuator paddle is not restricted Clean if necessary See Il D 2 b Mechanical Bin Control Cleaning If MBC switch still reads closed replace MBC 8 Reconnect MBC connector to CB K4 connector then move the control switch to the ICE position Turn on the power supply 9 Check that CB green BC CLOSED LED is on 10 Allow the icemaker to cycle on Press and hold the actuator paddle CB yellow BC OPEN LED should turn on and the icemaker should shut down according to the chart below If it does not replace CB Cycle at Mecha
25. 100 38 FREEZING CYCLE TIME 70 21 80 27 90 32 100 38 70 21 80 27 90 32 100 38 HEAD PRESSURE 70 21 80 27 90 32 PSIG kg cm G 100 38 SUCTION PRESSURE 70 21 80 27 90 32 PSIG kg cmG 100 38 TOTAL HEAT OF REJECTION 8900 BTU h AT 90 F 32 C WT 70 F 21 68 13 KML 631MWH Specification Sheet AC SUPPLY VOLTAGE 208 230 60 1 3 wire with neutral for 115V AMPERAGE 8 0 A 5 Min Freeze AT 104 F WT 80 F MINIMUM CIRCUIT AMPACITY 20A MAXIMUM FUSE SIZE 20A ELECTRIC amp WATER CONSUMPTION 90 70 70 50 F ELECTRIC W kWH 100 Ibs 1090 4 2 1050 3 8 WATER gal 24HR gal 100 Ibs 99 16 0 195 29 1 WATER COOLED CONDENSER 744 120 436 65 gal 24HR gal 100 Ibs ICE PRODUCTION PER CYCLE 10 5 Ibs 4 8 kg 480 pcs BIN CONTROL SYSTEM Thermostatic Bin Control REFRIGERANT CHARGE R 404A 1 Ib 6 0 oz 6259 Permormance Data Sheet APPROXIMATE ICE PRODUCTION AMBIENT TEMP WATER TEMP F C PER 24 HR F C 50 10 70 21 90 32 70 21 80 27 90 32 Ibs day _kg day 100 38 APPROXIMATE ELECTRIC 70 21 CONSUMPTION 80 27 90 32 watts 100 38 APPROXIMATE WATER 70 21 CONSUMPTION PER 24 HR 80 27 90 32 gal day m day 100 38 FREEZING CYCLE TIME 70 21 80 27 90 32 100 38 HARVEST CYCLE TIME 70 21 80 27 90 32 100 38 HEAD PRESSURE 70 21 80 27 90 32 PSIG kg cm G 100 38 SUCTION PRESSURE 70 21 80 27 90 32 PSIG kg cm G 100 38 TOTAL HEAT OF REJECTION FROM CONDENSER 8 400 BTU h AT 90 F
26. 115VAC at CB K1 1 or 9 V to neutral W If 115VAC is not present check for 115VAC at CB K1 7 or 10 BR or BK to neutral W If 115VAC is present at 7 or 10 BR or BK and not at 1 or 9 V replace CB If 115VAC is present check for 115VAC at CR solenoid If 115VAC is present confirm contacts are closed If not replace CR If CR contacts are closed check Comp external overload Comp start and run capacitors Comp start relay and Comp motor winding b HGV Diagnosis If Comp is energized and evaporator is not warming check that HGV energizes and opens Check for 115VAC at CB K1 2 P to neutral W If 115VAC is not present replace CB If 115VAC is present check for 115VAC at HGV coil and check HGV coil continuity Replace as needed LLV Diagnosis Confirm that LLV is de energized and closed not bypassing If energized replace CB If de energized and bypassing replace LLV d WRV Diagnosis Confirm WRV is not leaking by 24 5b Harvest Pump Timer LEDs 1 3 and 2 are When the thermistor reaches 48 F 9 C CB reads 3 9 from the thermistor and turns harvest termination over to the harvest timer S4 dip switch 1 amp 2 50 sec before the harvest timer terminates LED turns on and PM energizes Comp FMR HGV and X10 relay continue LED 4 turns off WV and X11 relay de energize Diagnosis Place a thermometer on the suction line next to the thermistor Has it warmed to 48 F 9 C or warmer Confir
27. 12 Headmaster C P R Not bypassing remote models 40 Controls and Adjustments A Hoshizaki exclusive control board is employed in KMD and KML series appliances All models are pretested and factory adjusted e For a control board check procedure see Control Board Check NOTICE Fragile handle very carefully The control board contains integrated circuits which are susceptible to failure due to static discharge It is especially important to touch the metal part of the icemaker when handling or replacing the control board Do not touch the electronic devices on the control board or the back of the control board Do not change wiring and connections Do not misconnect K3 WHITE K4 RED and K5 BLACK because the same connector is used for the thermistor mechanical bin control K4 jumper and float switch Do not short out power supply to test for voltage Always replace the whole control board assembly if it goes bad 41 Control Board Layout Bin Control Switch Closed LED green on continuously in thermostatic bin control application Bin Control Switch Open LED yellow mechanical bin control application Part Number Alarm Buzzer POWER OK LED red lights when 10 5VAC is supplied to K2 connector Relay LEDs 4 indicate which relays are energized and which K1 connector pins are energized LED 2 X2 Relay LED 2 on K1 Connec
28. 2 1 to CB K2 2 R If 10 5VAC is not present check CT continuity If open replace CT b HPS Diagnosis Check that the condenser coil is not clogged or restricted Let refrigeration circuit pressures equalize If HPS does not reset and pressures are equalized replace HPS If pressures are not equalized reclaim refrigerant and diagnose refrigeration circuit restriction Check that there are no restrictions in the refrigeration circuit Harvest Cycle HGV strainer or check valve Freeze Cycle FM FMR TXV WRV HM LLV strainer check valve drier and damaged line set or fitting On water cooled models confirm WRV opens in freeze cycle Confirm that the location meets installation requirements The appliance is not intended for outdoor use Normal operating ambient temperature should be within 45 F to 100 F 7 C to 38 C Allow 6 15 cm clearance at rear sides and top KMD 460 530MAH require 12 30 cm clearance at right side The appliance should not be located in a corrosive environment 23 4 1 Min Fill Cycle LED 4 is on WV and X11 relay energize After 1 min CB checks for a closed FS If FS is closed the harvest cycle begins X10 Comp HGV FMR energize Continue to step 5a If FS is open WV remains energized through additional 1 min fill cycles until water enters the water tank and FS closes low water safety protection during initial start up and at the end of each harvest Diagnosis Ch
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30. Bin Control Check b Mechanical Actuator does not move freely Freeze Up Possible Cause 10 Thermistor 8 Loose disconnected or defective See Thermistor Check 11 Thermostatic Expansion Valve 12 Hot Gas Valve 18 Liquid Line Valve 1 Evaporator S e ee o 2 Spray Tubes and or Spray Guides Low 4 Control Board See II C Control Board Check Defective 5 Inlet Water Valve Leaking by 6 Float Switch Float does not move freely and Cleaning 7 Pump Motor D a Bulb loose or defective a Restricted 10 Headmaster C P R a Not bypassing remote models 3 Low Ice Production Low Ice Production Possible Cause Long Harvest Cycle 1 Evaporator a Scaled up 2 Spray Tubes and or Spray Guides Insufficient water line size Minimum 1 4 Nominal ID 6 mm Nominal OD in the EU water tubing or equivalent d Too cold 5 Control Board a Thermistor connection loose K3 See II C Control Board Check Defective 6 Thermistor a Loose disconnected or defective See Thermistor Check 7 Hot Gas Valve a Erratic or closed 8 Inlet Water Valve a Screen or orifice clogged a Inefficient or off 39 10 Liquid Line Valve 11 Thermostatic Expansion Valve 2 Float Switch See ILE Float Switch Check k 6 Control Board Float switch connection loose K5 Ses ILC Control Board Check 8 Thermostatic Expansion Valve w ew t
31. CTION PRESSURE 70 21 80 27 90 32 PSIG kg cm G 100 38 TOTAL HEAT OF REJECTION FROM CONDENSER 6 400 BTU h AT 90 F 32 C WT 70 F 21 TOTAL HEAT OF REJECTION FROM COMPRESSOR 1 000 BTU h AT 90 F 32 C WT 70 F 219 WATER FLOW FOR CONDENSER 63 gal h 100 F 38 C WT 90 F 32 C PRESSURE DROP OF COOLING WATER LINE less than 10 PSIG 58 3 KMD 530MAH Data Pending 59 4 KMD 530MWH Data Pending 60 5 KMD 530MRH Data Pending 61 6 KML 250MAH Specification Sheet AC SUPPLY VOLTAGE 115 60 1 AMPERAGE 8 2A 5 Min Freeze AT 104 F WT 80 F MINIMUM CIRCUIT AMPACITY 20A MAXIMUM FUSE SIZE 20A ELECTRIC amp WATER CONSUMPTION 90 70 70 50 ELECTRIC W kWH 100 lbs 813 8 2 755 5 9 WATER gal 24HR gal 100 Ibs 84 35 2 194 63 1 ICE PRODUCTION PER CYCLE 6 6 Ibs 3 0 kg 360 pcs BIN CONTROL SYSTEM Thermostatic Bin Control REFRIGERANT CHARGE R 404A 11b 2 oz 505 Performance Data Sheet APPROXIMATE ICE PRODUCTION PER AMBIENT TEMP WATER TEMP F C 24 HR F C 50 10 70 21 90 32 70 21 80 27 90 32 Ibs day kg day 100 38 APPROXIMATE ELECTRIC 70 21 CONSUMPTION 80 27 90 32 watts 100 38 APPROXIMATE WATER 70 21 CONSUMPTION PER 24 HR 80 27 90 32 gal day m day 100 38 FREEZING CYCLE TIME HEAD PRESSURE 70 21 80 27 90 32 PSIG kg cm G 100 38 SUCTION PRESSURE 70 21 80 27 90 32 PSIG kg cm G 100 38 TOTAL HEAT OF REJECTIO
32. Hoshizaki America Inc Modular Crescent Cuber with Control Board Models KMD 460MAH KMD 530MAH KML 250MAH MWH KML 35 MAH KML 45 MAH MWH KML 63 IMAH MWH SERVICE MANUAL A Superior Degree of Reliability www hoshizaki com Number 73205 Issued 5 7 2015 WARNING Only qualified service technicians should install and service the appliance To obtain the name and phone number of your local Hoshizaki Certified Service Representative visit www hoshizaki com No service should be undertaken until the technician has thoroughly read this Service Manual Failure to service and maintain the appliance in accordance with this manual will adversely affect safety performance component life and warranty coverage and may result in costly water damage Proper installation is the responsibility of the installer Product failure or property damage due to improper installation is not covered under warranty Should the reader have any questions or concerns which have not been satisfactorily addressed please call send an e mail message or write to the Hoshizaki Technical Support Department for assistance Phone 1 800 233 1940 770 487 2331 Fax 1 800 843 1056 770 487 3360 E mail techsupport 9 hoshizaki com HOSHIZAKI AMERICA INC 618 Highway 74 South Peachtree City GA 30269 Attn Hoshizaki Technical Support Department Web Site www hosh
33. ICE position 7 Replace the front panel in its correct position then turn on the power supply 8 Blow the icemaker water supply line out using compressed air or carbon dioxide 2 Drain the water tank 1 2 Turn off the power supply then remove the front panel Move the service switch to the DRAIN position then move the control switch to the SERVICE position 3 Replace the front panel in its correct position then turn on the power supply for 2 minutes 4 Turn off the power supply then remove the front panel 6 7 Remove all ice from the dispenser unit storage bin Clean the dispenser unit storage bin using a neutral cleaner Rinse thoroughly after cleaning 5 Move the control switch to the OFF position Replace the front panel in its correct position 8 Close the icemaker water supply line drain valve 54 3 water cooled model remove the water from the water cooled condenser 1 Make sure the power supply is off then remove the front panel and right side panel 2 Close the condenser water supply line shut off valve If connected to a closed loop system also close the condenser return line shut off valve 3 Open the condenser water supply line drain valve If connected to a closed loop system also open the condenser return line drain valve 4 Attach a compressed air or carbon dioxide supply to the condenser water supply line drain valve 5 Open the water regulating valve by
34. LED Lights and Audible Alarm Safeties At startup a 5 second delay occurs while the control board conducts an internal timer check A beep occurs when the control switch is moved to the ICE position The red POWER OK LED indicates proper control voltage and remains on unless a control voltage problem occurs The green LEDs 1 through 4 energize and sequence from initial startup as listed in the table below Note that the order of the LEDs from the outer edge of the control board is 1 4 3 2 Energized Time LEDs are On 1 Minute Fill Cycle fw E Harvest Cycle HGV PM Freeze Cycle 1 Comp FM 5 minutes freeze timer 30 to 35 minutes FMR PM setting LLV Pump Out Cycle 1 4 3 2 Comp DV 10 seconds 20 seconds pump out timer FMR HGV PM setting SR WV The built in safeties shut down the icemaker and have alarms as listed below No of Beeps 1 High Evaporator Temp Check for harvest problem stuck HGV or relay hot temperature gt 127 F 53 water entering icemaker or shorted thermistor 2 Harvest Backup Timer Check for open thermistor HGV not opening TXV or harvest gt 20 min for two LLV leaking by low charge or inefficient Comp or WRV cycles in a row leaking by Harvest Pump Timer 1 3 Comp FMR 3 Freeze Timer Check for FS stuck closed up WV leaking by HGV freeze gt freeze timer setting leaking by PM not pumping not feeding properl
35. N 5560 BTU hr AT 90 F 32 C WT 70 F 21 62 7 KML 250MWH Specification Sheet AC SUPPLY VOLTAGE 115 60 1 AMPERAGE 7 5 5 Min Freeze AT 104 F WT 80 F MINIMUM CIRCUIT AMPACITY 20A MAXIMUM FUSE SIZE 20A ELECTRIC amp WATER CONSUMPTION 90 70 70 50 F ELECTRIC W kWH 100 lbs 0 0 00 0 0 0 WATER gal 24HR gal 100 Ibs 252 0 0 21 284 0 WATER COOLED CONDENSER 767 7 21 737 gal 24HR gal 100 Ibs ICE PRODUCTION PER CYCLE 6 6 Ibs 3 0 kg 360 pcs BIN CONTROL SYSTEM Thermostatic Bin Control REFRIGERANT CHARGE R 404A 14 1 oz 400 Performance Data Sheet APPROXIMATE ICE PRODUCTION PER AMBIENT TEMP WATER TEMP F C 24 HR F C 50 10 70 21 90 32 70 21 80 27 90 32 Ibs day kg day 100 38 APPROXIMATE ELECTRIC 70 21 CONSUMPTION 80 27 90 32 watts 100 38 APPROXIMATE WATER 70 21 CONSUMPTION PER 24 HR 80 27 90 32 gal day m day 100 38 FREEZING CYCLE TIME 70 21 80 27 90 32 100 38 70 21 80 27 90 32 100 38 HEAD PRESSURE 70 21 80 27 90 32 PSIG kg cm G 100 38 SUCTION PRESSURE 70 21 80 27 90 32 PSIG kg cm G 100 38 TOTAL HEAT OF REJECTION FROM CONDENSER 5000 BTU h AT 90 F 32 C WT 70 F 21 C TOTAL HEAT OF REJECTION FROM COMPRESSOR 930 BTU h AT 90 F 32 C WT 70 F 21 WATER FLOW FOR CONDENSER 27 gal 100 F 38 C WT 90 F 32 C PRESSURE DROP OF COOLING WATER LINE less than 10 PSIG 63 8 KML 351MAH Specification Sheet
36. OF REJECTION FROM COMPRESSOR 1 400 BTU h AT 90 F 32 WT 70 F 219 CONDENSER VOLUME 121 CU IN URC 9F 70 DISd 612 782 OlSd ie Zee UNI DISd 1788 DISd pom pejooo4ereM UOJIMS ansseld UbIH 451 _ 1 Operation with Thermostatic Control and without Harvest Pump Timer a KML 250M H KML 351MWH B Wiring Diagrams 71 VA 077 ji P 17 1 By Ct AW 40 H 31313 amejpue 1 8 4 10 4 NO duo 440 13013 320 135 440 139 44 seen pue 1 a Hyl 151151875 33 HW SEC M 440 40 0 40 34 Jaye pue 1 5 H4 E IA dado d NO 44 44 dH Jaye pue 8 3 H HMALGE TAM A 14131513 H 0113 H0 44 H0 2 1 9 Hy Pena EE TOT Y IWI dV 3002 XNY H 3 H 1138 HDL 1159 Jit AWA ANT 011011 5 5524 TOK 031009 4 13 gems 01 ele 5 4 t1 I
37. OHID Suonisod 2814 seu uos OQS eu UI eui pue YONMS seiddns uoiws eui uonisod 39IAH3S ueuMw UMOPINUS JEDIURYOSII pue onejsouuau e v Il ees pue uwopinus l 0 pue sdois dwog uedo SI 4 JI uedo 4 gt Y sues jeu 1seA eH 550 10 676 0 6 487 pezi amp jeuo AM saydea 101siu9U pezi amp jeue ADH pezi amp ueue pezi amp jeue dwog 14 peziB1eue ep ATI peziB1eue ep W4 DOS 02 01 10 7 Nd pue Aq uay Des 2 10 sezifJeue ep 7 ADH senunuoo dwog 19W 97994 Jo suedo 4 2 ADH pezifjeue pezi amp ueue ATT pezibieue W4 senumnuoo dwog uedo 4 pezi amp ueue ep AM pezibJeue xpeuo 54 7 AM 4 29505 54 lt dnyeis ae OS y ys ui Jeuln ezoe1j dung 08S 02 01 20 4 10 02 UI 64 gt 6 gt 4 2 youms dip jonuoo 01309 seziDieue ua 2952 UI ISOMJEU UIW 01 JOJSIWJOU 20 sdojs e 9 8 9 YOUMS dip vs 01 6 YOUMS 795
38. PPROXIMATE ELECTRIC CONSUMPTION watts APPROXIMATE WATER CONSUMPTION PER 24 HR gal day m day FREEZING CYCLE TIME HEAD PRESSURE PSIG kg cm G SUCTION PRESSURE PSIG kg cm G 115 60 1 7 5 5 Min Freeze AT 104 F WT 80 F 20A 20A 70 50 710 4 85 102 29 2 202 58 690 5 41 63 20 5 440 143 7 2 165 3 3 kg 360 pcs Thermostatic Bin Control R 404A 1 Ib 1 6 oz 500g AMBIENT TEMP WATER TEMP F C F C 50 10 70 21 90 32 70 21 80 27 90 32 100 38 70 21 80 27 90 32 100 38 70 21 80 27 90 32 100 38 70 21 80 27 90 32 100 38 70 21 80 27 90 32 100 38 70 21 80 27 90 32 100 38 70 21 80 27 90 32 100 38 TOTAL HEAT OF REJECTION FROM CONDENSER 4 700 BTU h AT 90 F 32 C WT 70 F 21 C TOTAL HEAT OF REJECTION FROM COMPRESSOR 900 BTU h AT 90 F 32 C WT 70 F 21 C WATER FLOW FOR CONDENSER 55 gal h AT 100 F 38 C WT 90 F 32 C PRESSURE DROP OF COOLING WATER LINE less than 10 PSIG 65 10 KML 451MAH Specification Sheet AC SUPPLY VOLTAGE 115 60 1 AMPERAGE 9 5 A 5 Min Freeze 104 F WT 80 F MINIMUM CIRCUIT AMPACITY 20A MAXIMUM FUSE SIZE 20A ELECTRIC amp WATER CONSUMPTION 90 70 F 70 50 F ELECTRIC W kWH 100 lbs 890 6 1 770 4 6 WATER gal 24HR gal 100 Ibs 63 18 0 111 27 6 ICE PRODUCTION PER CYCLE 7 6 Ibs 3 4 kg 360pcs BIN CONTROL SYSTEM Thermostatic Bin Control REFRIGERANT CHARGE R404A
39. arm Bulb out of position Open contacts defective 4 Fuse Control Box Blown 5 Control Switch In OFF or SERVICE position 6 High Pressure Switch Fan motor not operating Refrigerant overcharged Bad contacts Refrigerant lines or components plugged Coil winding open or shorted E cx 7 Control Transformer 115VAC 10 5VAC 8 Control Board a In alarm Control Board Check b Yellow BC OPEN LED on Jumper loose or missing on models with TBC Bin full on models with MBC 9 Mechanical Bin Control a Tripped with bin filled with ice See II D 2 Mechanical Bin b Actuator does not move freely Control Check and Cleaning 10 Water Supply a Water supply off or improper water pressure b External water filters clogged 11 Inlet Water Valve 8 Screen or orifice clogged Coil winding open c Water valve open in freeze cycle 12 Float Switch Float does not move freely See Float Switch Check b Defective and Cleaning 13 Compressor a Compressor relay magnetic contactor contacts bad or coil winding open Internal protector open d Start relay contacts bad or coil winding open single phase Compressor defective 37 No Ice Production Possible Cause 14 Hot Gas Valve Closed in harvest cycle b Open in freeze cycle 15 Thermistor a Loose disconnected or defective See
40. atic and Mechanical Bin Control Shutdown Operation 15 SS apc 16 1 Control Board without Harvest Pump Timer Operation Diagnosis 17 2 Control Board with Harvest Pump Timer Operation Diagnosis 23 G Control Bostd Cheek a a a aa aaa 30 D Bin Control CHG CI A E E a E 31 1 Thermostatic Bin Control Check nennen DEG ZUM 31 2 Mechanical Bin Control Check and Cleaning i ooooooooo oo oom 32 E Float Switch Check and Cleaning 34 1 Float Swt CHECK 34 2 Float stupens apap vaut aaa 35 F heri star C 36 G Diagnostic TADS S bela anna moge Monalisa 37 1 ING les Prod OOM um mn 37 n 38 LOW Ice Met 39 IL Conirols and AUIUSUTIBTIDS eo a ak 41 A Contio Board Layout ne es ama a ang 42 LED Lights and Audible Alarm Safeties mesem sahamnya 43 gt Settings and to MO 44 T Default Dip Switeh Seting 44 2 Harvest Timer S4 dip switch 1 amp 2 me 45 3 Pump Out Timer 94 dip switch 3 amp 4 45 4 Pump Out Frequency Control S4 dip s
41. check for 115VAC at X12 relay 8 DBU to neutral W If 115VAC is not present check that X10 relay is de energized If not check X11 relay status If X11 relay is energized check that S4 dip switch 3 and 4 are not set to 3 on and 4 off positions if not and X11 is energized replace CB Next If X11 relay is de energized and X10 relay is energized replace X11 relay contacts sticking If X10 relay is de energized check for 115VAC at X10 relay terminal 5 DBU and terminal 1 DBU to neutral W If 115VAC is present at terminal 5 DBU and not at terminal 41 DBU replace X10 relay If 115VAC is present at X12 relay 8 to neutral W PM Check for 115VAC at X12 relay 6 BR or BK and X12 relay 4 Y to neutral W If 115VAC is present at X12 relay 6 BR or BK and not at X12 relay 4 Y replace X12 relay If 115VAC is present at X12 relay 4 Y check PM capacitor motor winding and impeller for binding DV Check for 115VAC at X12 relay 5 DBU and X12 relay to neutral W If 115VAC is present at X12 relay 5 DBU and not at X12 relay 3 GY replace X12 relay If 115VAC is present at X12 relay 3 GY check DV solenoid replace as needed Next confirm that the drain line is not clogged Confirm FM and LLV de energize If FM or LLV are energized with LEDs 1 3 and 2 on replace CB 8 Normal Harvest Cycle Same as the initial harvest cycle Return to step 5a above Note Appliance continues to
42. circuit restriction Check that there are no restrictions in the refrigeration circuit Harvest Cycle HGV strainer or check valve Freeze Cycle FM FMR TXV WRV HM LLV strainer check valve drier and damaged line set or fitting On water cooled models confirm WRV opens in freeze cycle Confirm that the location meets installation requirements The appliance is not intended for outdoor use Normal operating ambient temperature should be within 45 F to 100 F 7 C to 38 C Allow 6 15 cm clearance at rear sides and top for proper air circulation and ease of maintenance and or service should they be required The appliance should not be located in a corrosive environment 4 1 Minute Fill Cycle LED 4 is on WV energizes After 1 CB checks for a closed FS If FS is closed harvest cycle begins If harvest cycle begins Comp HGV and FMR energize continue to step 5 If FS is open WV remains energized through additional 1 min fill cycles until water enters the water tank and FS closes low water safety protection during initial start up and at the end of each harvest Diagnosis Check that water enters the water tank If not check that the water supply line shut off valve is open and screens or external filters are clear Check for 115VAC at CB K1 6 to neutral W If 115VAC is not present replace CB If 115VAC is present and WV does not energize check for 115VAC at WV If 115VAC is present check
43. coil continuity If open replace WV If the water tank fills but the appliance fails to start harvest Comp energized check for open FS See Float Switch Check and Cleaning If FS is closed and CB fails to start the harvest cycle after 1 min replace CB 5 Initial Harvest Cycle LEDs 1 4 and 2 are on WV continues Comp FMR and HGV energize CB monitors the warming of the evaporator via the thermistor located on the suction line When the thermistor reaches 48 F 9 C CB reads 3 9 from the thermistor and turns harvest termination over to the harvest timer S4 dip switch 1 amp 2 The harvest timer has settings of 60 90 120 and 180 sec The pump out timer S4 dip switch 3 amp 4 acts in place of the harvest timer during cycles with a pump out S4 dip switch 5 amp 6 WV remains energized during harvest for a maximum of 6 min or the length of harvest whichever is shorter a Comp Diagnosis Check that evaporator is warming If not confirm that Comp energizes If not check for 115VAC at CB K1 1 or 9 V to neutral W If 115VAC is not present check for 115VAC at CB K1 7 or 10 BR to neutral W If 115VAC is present at 7 or 10 BR and not at 1 or 9 V replace CB If 115VAC is present check for 115VAC at CR or MC solenoid If 115VAC is present confirm contacts are closed If not replace CR or MC If CR or MC contacts are closed check Comp external protector Comp start and run capacitors Comp star
44. cycle until TBC or MBC is satisfied or power is switched off The appliance always restarts at the 1 min fill cycle 28 9 Shutdown Thermostatic Bin Control When the appliance is running hold ice in contact with the thermostatic bulb BC switch opens within 10 sec shutting down the appliance TBC is factory set and generally no adjustment is required However adjustment may be needed in some conditions particularly at higher altitude locations Diagnosis See II D 1 Thermostatic Bin Control Check CB red K4 connector must have the jumper in place When the jumper is in place the green BC CLOSED LED remains on If the jumper is not in place yellow BC OPEN LED turns on and the icemaker turns off and remains off until the jumper is replaced in its original position NOTICE CB red K4 connector jumper 4A4883G01 must be in place b Mechanical Bin Control MBC See 1 0 2 Mechanical Bin Control Check and Cleaning Legend BC bin control CB control board Comp compressor CR compressor relay DV drain valve FM fan motor FMR fan motor remote FS float switch HGV hot gas valve HM headmaster C P R HPS high pressure switch LLV liquid line valve MBC mechanical bin control PM pump motor TBC thermostatic bin control TXV thermostatic expansion valve WRV water regulating Valve WV inlet water valve 29 C Control Board Check Before replacing CB that does not show a visible defect and that you susp
45. e power supply then move the control switch to the ICE position A 5 sec delay occurs CB red POWER OK LED and green BC CLOSED LED turn on If yellow BC OPEN LED is on indicating a full bin KML 351MAH KML 631M H If yellow BC OPEN LED is on indicating a missing or loose jumper 4A4883G01 check that the jumper is securely in place Move ice away from bulb If yellow BC OPEN LED stays on see II D 1 Thermostatic Bin Control TBC Check KMD 460M H KMD 530M H Check MBC Move ice away from MBC actuator paddle If yellow BC OPEN LED stays on see 1 0 2 Mechanical Bin Control MBC Check and Cleaning NOTICE Do not adjust S4 dip switch 7 out of the factory default position This dip switch must be left in the factory default position or the appliance will not operate correctly Note CB red POWER OK LED remains on unless the 10 5VAC power supply is interrupted K2 connector a Power On Diagnosis If CB red POWER OK LED is off confirm 10A fuse is good Check for 115VAC at control switch 42 BR or BK to neutral W then at control switch 3 P to neutral W If 115VAC is present on 2 BR or BK and not on 3 P replace control switch If 115VAC is present on control switch 3 P check for 115VAC at HPS P to neutral W then HPS BK to neutral W If 115VAC is present at HPS P and not at HPS BK HPS is open See HPS Diagnosis below If 115VAC is present at HPS BK check for 10 5VAC at CB K
46. e storage bin are clean after service A Refrigeration Circuit Service Information WARNING Repairs requiring the refrigeration circuit to be opened must be performed by properly trained and EPA certified service personnel Use an electronic leak detector or soap bubbles to check for leaks Add a trace of refrigerant to the system if using an electronic leak detector and then raise the pressure using nitrogen gas 140 PSIG Do not use R 404A as a mixture with pressurized air for leak testing NOTICE Always recover the refrigerant and store it in an approved container Do not discharge the refrigerant into the atmosphere Do not leave the system open for longer than 15 min when replacing or servicing parts The Polyol Ester POE oils used in R 404A applications can absorb moisture quickly Therefore it is important to prevent moisture from entering the system when replacing or servicing parts Always install a new drier every time the sealed refrigeration system is opened Do not replace the drier until after all other repair or replacement has been made Install the new drier with the arrow on the drier in the direction of the refrigerant flow When brazing protect the drier by using a wet cloth to prevent the drier from overheating Do not allow the drier to exceed 250 F 121 C 1 Refrigerant Recovery The icemaker is provided with refrigerant access valves Using proper refrigerant practices recover t
47. e the nameplate for electrical specifications Failure to use an independent power supply of proper capacity can result in a tripped breaker blown fuses damage to existing wiring or component failure This could lead to heat generation or fire THE ICEMAKER MUST BE GROUNDED Failure to properly ground the icemaker could result in death or serious injury Move the control switch to the OFF position and turn off the power supply before servicing Lockout Tagout to prevent the power supply from being turned back on inadvertently To reduce the risk of electric shock do not touch the control switch or service switch with damp hands Do not make any alterations to the unit Alterations could result in electric shock injury fire or damage to the unit The appliance is not intended for use by persons including children with reduced physical sensory or mental capabilities or lack of experience and knowledge unless they have been given supervision or instruction concerning use of the appliance by a person responsible for their safety WARNING continued Children should be properly supervised around this appliance Do not climb stand or hang on the appliance or allow children or animals to do so Serious injury could occur or the appliance could be damaged Do not use combustible spray or place volatile or flammable substances near the appliance They might catch fire Keep the area around the appliance
48. eck that water enters the water tank If not check that the water supply line shut off valve is open and screens or external filters are clear Check for 115VAC at CB K1 6 O to neutral W If 115VAC is not present replace CB If 115VAC is present and WV does not energize check for 115VAC at WV If 115VAC is present check coil continuity If open replace WV If the water tank fills but the appliance fails to start harvest Comp energized check for open FS See Float Switch Check and Cleaning If FS is closed and CB fails to start the harvest cycle after 1 min replace CB 5a Initial Harvest Cycle LEDs 1 4 and 2 are on WV and X11 relay continue Comp FMR HGV and X10 relay energize CB monitors the warming of the evaporator via the thermistor located on the suction line When the thermistor reaches 48 F 9 C CB reads 3 9 kO from the thermistor and turns harvest termination over to the harvest timer S4 dip switch 1 amp 2 The harvest timer has settings of 60 90 120 and 180 sec The pump out timer S4 dip switch 3 amp 4 acts in place of the harvest timer during cycles with a pump out S4 dip switch 5 amp 6 WV and X11 relay are energized during harvest for a maximum of 6 min or the length of harvest minus 50 sec whichever is shorter 50 sec before harvest terminates PM energizes See step 5b below a Comp Diagnosis Check that evaporator is warming If not confirm that Comp energizes If not check for
49. ect is bad always conduct the following check procedure This procedure will help you verify your diagnosis Alarm Reset If CB is in alarm beeping press the ALARM RESET button on CB while CB is beeping WARNING Risk of electric shock Care should be taken not to touch live terminals Once reset the icemaker starts at the 1 minute fill cycle For audible alarm information see LED Lights and Audible Alarm Safeties 1 Check the dip switch settings to assure that S4 dip switch 3 4 7 8 9 10 and S5 dip switch 1 through 5 are in the factory default position S4 dip switch 1 2 5 6 are cleaning adjustments and the settings are flexible For factory default settings see 1 Default Dip Switch Settings 2 Move the control switch to the ICE position If the red POWER OK LED is on control voltage is good continue to step 3 If the POWER OK LED is off check CT secondary circuit CT output is 10 5VAC at 115VAC primary input If the secondary circuit has proper voltage and the red LED is off replace CB If the secondary circuit does not have proper voltage 10 5VAC check CT primary circuit Check for 115VAC at control switch terminal 42 BR or BK and control switch terminal 3 P to neutral W If 115VAC is present at control switch terminal 2 BR or BK and not at control switch terminal 3 P replace control switch If 115VAC is present at control switch terminal 3 P check for 115VAC at HPS BK to neu
50. ending on local water conditions scale may build up on FS Scale on the switch can cause the float to stick In this case FS should be cleaned 1 Remove the front panel then move the control switch to the SERVICE position Move the service switch to the DRAIN position 2 Allow the water to drain from the water tank then move the control switch to the OFF position Turn off the power supply 6 Remove the FS from the PM bracket and water tank 7 Remove the retainer rod from the bottom of FS housing then remove the float Be careful not to bend the retainer rod excessively when removing it See Fig 3 6 Wipe down FS housing shaft float and retainer rod with a mixture of 1 part Hoshizaki Scale Away and 25 parts warm water Rinse the parts thoroughly with clean water 7 Reassemble FS assembly and replace it in its correct position 8 Move the control switch to the ICE position 9 Replace the front panel in its correct position 10 Turn on the power supply to start the automatic icemaking process Legend CB control board FS float switch PM pump motor L Vent Shaft Float Switch Housing lA Float Retainer Rod Fig 3 35 F Thermistor Check To check thermistor resistance follow the steps below 1 Turn off the power supply 2 Remove the front panel Move the control switch to the OFF position 3 Remove the control box cover 5 Immer
51. enser drain temperature is stable 52 V Maintenance The maintenance schedule below is a guideline More frequent maintenance may be required depending on water quality the appliance s environment and local sanitation regulations WARNING Only qualified service technicians should service the appliance To reduce the risk of electric shock do not touch the control switch or service switch with damp hands Before servicing Move the control switch to the OFF position and turn off the power supply Place the disconnect in the OFF position Lockout Tagout to prevent the power supply from being turned back on inadvertently CHOKING HAZARD Ensure all components fasteners and thumbscrews are securely in place after any maintenance is done to the icemaker Make sure that none have fallen into the dispenser unit ice storage bin Maintenance Schedule Clean the ice scoop using a neutral cleaner Rinse thoroughly after cleaning Bi Weekly Air Filters Inspect Wash with warm water and neutral cleaner if dirty Monthly External Water Check for proper pressure and change if necessary Icemaker Exterior Wipe down with a clean soft cloth Use a damp cloth containing a neutral cleaner to wipe off oil or dirt build up Clean any chlorine staining rust colored spots using a non abrasive cleanser Underside of Wipe down with a clean cloth and warm water Icemaker and Top Kits Bin Door and Snout
52. he refrigerant Store the refrigerant in an approved container Do not discharge the refrigerant into the atmosphere 49 2 Brazing WARNING R 404A itself is not flammable at atmospheric pressure and temperatures up to 176 F 80 C R 404A itself is not explosive or poisonous However when exposed to high temperatures open flames R 404A can be decomposed to form hydrofluoric acid and carbonyl fluoride both of which are hazardous Do not use silver alloy or copper alloy containing arsenic 1 Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG Note Because the pipes in the evaporator case are specially coated to resist corrosion it is important to make connections outside the evaporator case when possible If it is necessary to braze inside the evaporator case use sandpaper to remove the coating from the brazing connections before unbrazing the components NOTICE Always install a new drier every time the sealed refrigeration system is opened Do not replace the drier until after all other repair or replacement has been made Install the new drier with the arrow on the drier in the direction of the refrigerant flow When brazing protect the drier by using a wet cloth to prevent the drier from overheating Do not allow the drier to exceed 250 F 121 C 2 Use an electronic leak detector or soap bubbles to check for leaks Add a trace of refrigerant to the s
53. hich could result in death serious injury damage to the appliance or damage to property WARNING Indicates a hazardous situation which could result in death or serious injury NOTICE Indicates a situation which could result in damage to the appliance or property IMPORTANT Indicates important information about the use and care of the appliance WARNING The appliance should be destined only to the use for which it has been expressly conceived Any other use should be considered improper and therefore dangerous The manufacturer cannot be held responsible for injury or damage resulting from improper incorrect and unreasonable use Failure to service and maintain the appliance in accordance with this manual will adversely affect safety performance component life and warranty coverage and may result in costly water damage To reduce the risk of death electric shock serious injury or fire follow basic precautions including the following Only qualified service technicians should install and service this appliance The appliance must be installed in accordance with applicable national state and local codes and regulations Electrical connection must be hard wired and must meet national state and local electrical code requirements Failure to meet these code requirements could result in death electric shock serious injury fire or damage The icemaker requires an independent power supply of proper capacity Se
54. in the prohibited range the appliance operates continuously even if the ice storage bin is filled with ice Setting in the prohibited range may result in severe damage to the appliance TBC is factory set and generally no adjustment is required However adjustment may be needed in some conditions particularly at higher altitude locations Note On control boards a jumper 4A4883G01 must be placed on CB red K4 connector Otherwise CB yellow BC OPEN LED is on and appliance will not start To check TBC follow the steps below 1 Turn off the power supply Remove the front panel then move the control switch to the OFF position Remove the control box cover then clear any ice away from bulb Disconnect TBC wires from TBC switch Hold your hand around the bulb to warm it up Check for continuity across TBC switch If closed continue to step 6 If open adjust or replace TBC 7 With the multimeter test leads still in place hold ice on TBC bulb to lower the temperature Within 10 sec TBC switch should open If it remains closed adjust or replace TBC Legend TBC thermostatic bin control 31 2 Mechanical Control Check and Cleaning a Mechanical Bin Control Check A lever actuated proximity switch is used to control the ice level in the storage bin No adjustment is required To check MBC follow the steps below 1 Turn off the power supply 2 Remove the front panel then move the control switch
55. inder then place it on the scales Open the high side valve on the gauge manifold 7 Allow the system to charge with liquid until the proper charge weight is met 8 If necessary add any remaining charge to the system through the low side NOTICE To prevent compressor damage use a throttling valve or liquid dispensing device to add the remaining liquid charge through the low side refrigerant access valve with the icemaker running 9 Close the high and low side gauge manifold valves then disconnect the gauge manifold hoses 10 Cap the refrigerant access valves to prevent a possible leak 51 B Component Service Information NOTICE When replacing a component listed below see the notes to help ensure proper operation Component 1 phase Install a new start capacitor run capacitor and start relay 3 phase Install a new magnetic contactor Thermostatic Attach the thermostatic expansion valve bulb to the suction line in the same location as Expansion Valves the previous bulb The bulb should be between the 10 and 2 o clock positions on the tube Secure the bulb with the clamp and holder then insulate it Hot Gas Valves Replace the strainer if applicable Liquid Line Valves Install a new capacitor Pump Motor Install a new capacitor Thermistor Attach the new thermistor to the suction line in the same location as the previous thermistor The thermistor should be at the 12 o clock pos
56. ing Valve High Pressure Switch Hot Gas Valve Strainer Compressor Thermostatic Expansion Valve Refrigeration Circuit mEmEEN Water Circuit 11 3 Remote Models MRH Condenser Condenser Fan Motor Headmaster 5 High Pressure d Switch Spray Tubes 7 UJ xU ali Water Supply Inlet Inlet Water Valve gt Cleaning Valve Liquid Line Heat Exchanger Valve Drain Valve Thermistor Hot Gas Valve Strainer Thermostatic Expansion Valve Refrigeration Circuit mEmEN Water Circuit TA iagnosis Sequence of Operation and Service D A Sequence of Operation Flow Chart jo seoeuns episino pue 404 1ezniues pue Jeueejo pesn SI SIu pue eui perddns si Jamod HSVM J9JUI AM pinbII AT anjen 10U A9H MURI JOJEM eu siu eA eA pue J0JowW eui perjddns 5 Jamod yms 1e0J 84 uej HIA d spoued 10 Joyelodena eui jo adejins apisino pesn eq ued siu Ajuo Jojow perjddns si ALVINOYIO Uonouni JO 10 uogeuuojul 99S HSVM Pu 3 1v 1n0HIO Suonisod
57. ition on the tube e Smoothly fill the recessed area of the thermistor holder with high thermal conductive type sealant Hoshizaki America part number 4A0683 01 Silicone Heat Sink Compound 10 8108 manufactured by GC Electronics KE 4560 RTV manufactured by ShinEtsu Silicones or equivalent are recommended Secure the thermistor with the holder then insulate it Be very careful to prevent damage to the leads C Water Regulating Valve Adjustment water cooled model The water regulating valve is factory set and generally no adjustment is required However when necessary adjust the water regulator using the following procedure Use copper tube of the same diameter and length when replacing valve lines 1 Prepare a thermometer to check the condenser drain temperature Attach a pressure gauge to the high side line of the system kasmaran 2 5 min after freeze cycle starts confirm that the thermometer reads 104 F to 115 D omm 40 C to 46 C If it does not rotate the CW Higher adjustment screw by using a flat blade COW Lower screwdriver until the temperature is in the Cn proper range See Fig 4 Nexi check that gt the reference pressure is in the range indicated in the Head Pressure table in the Performance Data section If it is not in the Top View 4 UN proper range verify the refrigerant charge 3 Check that the cond
58. izaki com NOTE To expedite assistance all correspondence communication MUST include the following information Model Number e Serial Number Complete and detailed explanation of the problem IMPORTANT This manual should be read carefully before the appliance is serviced Read the warnings and guidelines contained in this manual carefully as they provide essential information for the continued safe use service and maintenance of the appliance Retain this manual for any further reference that may be necessary CONTENTS Important Safety IMO AN QUI a 5 Construction and Water Refrigeration Circuit 7 195 3 7 TAirCooled MAH mba 7 2 WaterCooled MWH 8 3 Remote Air Cooled MUT una sman uni 9 B Water Refrigeration Circuit DIAGTAM ocehan hakim 10 1 Air Cooled Models MAH kem mamanya 10 2 Water Cooled Models MWH aaa nenen Qaa GR IR B aaa patas 11 3 Remote Models MAY assent tabescere maa 12 Sequence of Operation and Service Diagnosis oooo WWW 13 Sequence or Operation Flow 13 1 Control Board without Harvest Pump Timer Operation 13 2 Control Board with Harvest Pump Timer Operation 14 Thermost
59. le solutions The freeze timer is factory set and no adjustment is required Before changing this setting contact Hoshizaki Technical Support at 1 800 233 1940 for recommendations 8 Float Switch Selector S5 dip switch 1 NOTICE Do not adjust This must be left in the factory default position or the icemaker will not operate correctly 9 Refill Counter S5 dip switch 2 3 and 5 Program Selector 4 NOTICE Do not adjust These must be left in the factory default position or the icemaker will not operate correctly 47 D Switches Two control switches are used to control operation in KMD and KML Series Modular Crescent Cubers These switches are referred to as the control switch and the service switch and are located on the control box mah Control Switch The control switch has three positions OFF for power off ICE for icemaking and SERVICE to activate the service switch 2 Service Switch When the control switch is in the SERVICE position the control switch supplies power to the service switch and the machine is in service mode The service switch has three positions DRAIN CIRCULATE and WASH See the information below for details of each function Note 1 When the service switch is activated power is supplied to the water pump in all three positions 2 When the control switch is in the OFF position or in the ICE position the service switch has no power and can be left in any po
60. m thermistor status See Thermistor Check If the thermistor reading is in proper range dip switch 7 is on and WV continues check for 115VAC at CB K1 6 If 115VAC is present and LED 4 is off replace CB If LED 3 is on and PM is not energized check for 115VAC at CB K1 5 If 115VAC is not present replace CB If 115VAC is present and PM is not energized check for 115VAC at X10 relay terminal 8 Y to neutral W If 115VAC is not present check for 115VAC at X10 relay terminal 4 P and X10 relay terminal 6 Y to neutral W If 115VAC is present at terminal 4 P and not at terminal 6 Y replace X10 relay If 115VAC is present on X10 relay terminal 8 Y and PM is not energized check for 115VAC at X10 relay terminal 3 R and X10 relay terminal 5 DBU to neutral W If 115VAC is present at X10 relay terminal 5 DBU and not at X10 relay terminal 3 replace X10 relay If 115VAC is present at X10 relay terminal 3 check control switch contact continuity between control switch terminals 6 R and control switch terminal 5 Y If contacts are open replace control switch If contacts are closed and 115VAC is present between control switch terminal 5 Y and neutral W check PM capacitor and motor winding continuity 5c Initial Harvest Cycle Termination Diagnosis When the harvest timer S4 dip switch 1 amp 2 terminates harvest cycle terminates Check discharge line temperature For a thermist
61. mal Harvest Cycle Same as the initial harvest cycle Return to step 5 above Note Appliance continues to cycle until TBC is satisfied or power is turned off The appliance always restarts at the 1 min fill cycle 21 9 Shutdown a Thermostatic Bin Control TBC When the appliance is running hold ice in contact with the thermostatic bulb BC switch opens within 10 sec shutting down the appliance TBC is factory set and generally no adjustment is required However adjustment may be needed in some conditions particularly at higher altitude locations Diagnosis See II D 1 Thermostatic Bin Control Check CB red K4 connector must have the jumper in place When the jumper is in place the green BC CLOSED LED remains on If the jumper is not in place yellow BC OPEN LED turns on and the icemaker turns off and remains off until the jumper is replaced in its original position IMPORTANT CB red K4 connector jumper 4A4883G01 must be in place Legend BC bin control CB control board Comp compressor CR compressor relay DV drain valve FM fan motor FMR fan motor remote FS float switch HGV hot gas valve HM headmaster C P R HPS high pressure switch LLV liquid line valve MC magnetic contactor PM pump motor TBC thermostatic bin control TX V thermostatic expansion valve WRV water regulating valve WV inlet water valve 22 2 Control Board with Harvest Pump Timer Operation Diagnosis 3 Power On Turn on th
62. nd Performance Data Sheets If refrigerant pressures are correct and WRV does not open adjust or replace as needed See IV C Water Regulating Valve Adjustment water cooled models 26 h Freeze Termination Diagnosis After 5 in freeze disconnect CB K5 FS connector 15 sec later appliance should switch out of the freeze cycle 15 second delay after FS opens before terminating the freeze cycle If appliance remains in freeze longer than 15 sec after FS removed replace CB If appliance switches with FS removed but would previously not switch out of freeze with FS connected long freeze beep alarm see Float Switch Check and Cleaning Note Normal freeze cycle will last 20 to 40 min depending on model and conditions Cycle times and pressures should follow performance data provided in this manual See VIII A Specification and Performance Data Sheets i Short Freeze Cycle Diagnosis Confirm water tank fills and overflows during 1 min fill and harvest cycles If not check water supply filters shut off valve WV screen If water tank empties before 5 min timer terminates and freeze cycle is short check that DV is not leaking by or energized water flowing through DV If DV is leaking by remove and clean DV replace as needed If water tank is full see Float Switch Check and Cleaning for erratic operating FS 7 Pump Out Cycle LEDs 1 3 and 2 on 10 20 second pump out Timing of the first
63. nd pressures should follow performance data provided in this manual See VIII A Specification and Performance Data Sheets i Short Freeze Cycle Diagnosis Confirm water tank fills and overflows during 1 min fill and harvest cycles If not check water supply filters shut off valve WV screen If water tank empties before 5 min timer terminates and freeze cycle is short check that DV is not leaking by or energized water flowing down the potable drain If DV is leaking by clean DV replace as needed If DV is energized during the freeze cycle replace CB If water tank is full see Float Switch Check and Cleaning for erratic operating FS 20 7 Pump Out Cycle LEDs 1 3 and 2 are on 10 20 second pump out Timing the first pump out is dependent on CB The first pump out is determined by S4 dip switch 5 amp 6 See the table below G Control Board Settings 1stPump Out 4 Dip Switch Setting G Control Board Comp and FMR continue HGV energizes LLV and FM de energize If S4 dip switch 3 amp 4 are set to 3 off and 4 on LED 4 turns on and WV energizes PM stops for 2 sec then PM and DV energize for 10 20 sec depending on pump out timer S4 dip switch 3 amp 4 setting When the pump out timer terminates pump out is complete The pump out frequency control S4 dip switch 5 amp 6 is factory set and generally no adjustment is required However the pump out frequency control can be set to have a pump out
64. nds of harvest When the pump motor is energized water circulates over the evaporator The harvest water valve is open during harvest for a maximum of 6 minutes or the length of harvest minus 0 or 50 seconds determined by the harvest pump timer setting whichever is shorter When S4 dip switch 7 is in the on position and harvest begins X11 and X10 relays energize A latching circuit is created through the X11 and X10 relays For further details see VIILB Wiring Diagrams 50 sec before harvest termination LED 4 turns off inlet water valve and X11 relay de energize X10 relay remains energized through the latching circuit Next LED 3 turns on and control board K1 connector pin 5 DBU wire energizes energizing the pump motor for the last 50 sec of harvest S4 Dip Switch Setting Pump Motor Time or 6 Factory Use S4 dip switch 8 Factory set for proper operation Do not adjust This must be left in the factory default position 46 7 Freeze Timer S4 dip switch 9 amp 10 NOTICE Adjust to proper specification or the icemaker may not operate correctly The freeze timer setting determines the maximum allowed freeze time to prevent possible freeze up issues Upon termination of the freeze timer the control board initiates the harvest cycle or pump out cycle After 2 consecutive freeze timer terminations the control board shuts down the icemaker In this case see II G 3 Low Ice Production for possib
65. nical Bin Control Activation Fill Cycle 15 sec after activation Harvest Cycle At the end of the harvest cycle or up to 15 sec into the freeze cycle if activated at the end of the harvest cycle Freeze Cycle 15 sec after activation if activated at least 15 sec before the 5 min short cycle protection timer terminates Otherwise at the end of the next harvest cycle Legend MBC mechanical bin control CB control board 32 b Mechanical Control Cleaning Scale may build up on MBC Scale can cause the actuator paddle and magnet to stick In this case MBC should be cleaned A WARNING CHOKING HAZARD Ensure all components fasteners and thumbscrews are securely in place after the icemaker is serviced Make sure that none have fallen into the dispense unit ice storage bin Turn off the power supply Remove the front panel then move the control switch to the OFF position 1 2 3 4 Clear any ice away from MBC Disconnect MBC connector from CB K4 connector then remove MBC from the icemaker 5 Remove the actuator paddle from the switch mount See Fig 2 6 Wipe down MBC with a mixture of 1 part of Hoshizaki Scale Away and 25 parts of warm water Rinse the parts thoroughly with clean water 7 Reassemble MBC and replace it in its correct position Note If the magnet was removed for cleaning be sure to replace it in its correct position 8 Reconnect MBC connector to CB K4 connector then move the
66. oling check refrigerant pressures See VIII A Specification and Performance Data Sheets Next check HM operation If refrigeration pressures are above HM setpoint and HM is bypassing replace HM Check TXV for proper operation Remove TXV bulb and hold it in your hand refrigerant low side pressure should rise place TXV bulb in ice water refrigerant low side pressure should drop A 10 to 15 pound pressure swing between warm and cold conditions indicate a good TXV If a 10 to 15 pound swing is not present replace TXV 9 WRV Diagnosis WRV is factory set and generally no adjustment is required If WRV fails to open in freeze check for proper refrigerant pressures See Specification and Performance Data Sheets If refrigerant pressures are correct and WRV does not open adjust or replace as needed See IV C Water Regulating Valve Adjustment water cooled model h Freeze Termination Diagnosis After 5 min in freeze disconnect CB K5 FS connector 15 sec later appliance should switch out of the freeze cycle 15 second delay after FS opens before terminating the freeze cycle If appliance remains in freeze longer than 15 sec after FS removed replace CB If appliance switches with FS removed but would previously not switch out of freeze with FS connected long freeze beep alarm see Float Switch Check and Cleaning Note Normal freeze cycle will last 20 to 40 min depending on model and conditions Cycle times a
67. ontinuity across FS leads With the water tank empty FS should be open If open continue to step 9 If closed follow the steps in 2 Float Switch Cleaning After cleaning FS check it again Replace if necessary 6 Reconnect FS connector to CB K5 black connector then replace the control box cover in its correct position 7 Move the control switch to the ICE position Replace the front panel in its correct position then turn on the power supply After 1 min the 1 min fill cycle should end and the initial harvest cycle should begin If the initial harvest cycle begins FS is good and the check is complete If the initial harvest cycle does not begin continue to step 11 8 Turn off the power supply 9 Remove the front panel Move the control switch to the OFF position 10 Remove the control box cover 11 12 Disconnect FS connector from CB K5 black connector Check for continuity across FS leads With the water tank full FS should be closed If FS is closed and the icemaker will not switch from the 1 min fill cycle to the initial harvest cycle replace CB If FS is open confirm that the water tank is full If the water tank is not full check the water supply water filters and inlet water valve If the water tank is full follow the steps in 2 Float Switch Cleaning After cleaning FS check it again Replace if needed Legend CB control board FS float switch 34 2 Float Switch Cleaning Dep
68. or check see Thermistor Check If 1 min fill cycle starts after harvest timer terminates check that FS is clean and operating properly see Float Switch Check and Cleaning If FS is closed CB proceeds to the next cycle If not replace CB Note The minimum total time allowed by CB for a complete harvest cycle is 2 min Maximum harvest time allowed is 20 min IMPORTANT S4 dip switch 7 must remain on Otherwise PM will not energize during the last 50 sec of harvest 6 Freeze Cycle LED 1 is on Comp FMR and PM continue FM and LLV energize HGV and X10 relay de energize Appliance is held in freeze by a 5 min short cycle protection timer After 5 min timer terminates and FS opens freeze cycle terminates Note PM power supply switches from CB K1 5 in harvest to K1 4 R in freeze a Freeze Cycle Diagnosis Confirm Comp FMR and PM continue Confirm that FM and LLV energize Confirm WRV opens Next confirm HGV and X10 relay de energize During the first 5 min of freeze confirm evaporator is cooling If not confirm WV de energized not leaking by HGV de energized not bypassing LLV and FM energize TXV and HM operate correctly WRV opens Comp is efficient and refrigerant charge is correct See VIII A Specification and Performance Data Sheets 25 b Comp and FMR Diagnosis If Comp and FMR de energize once freeze begins check that appliance has not shut off on HPS POWER OK LED off If so
69. pump out is determined by S4 dip switch 5 amp 6 See the table below G Control Board Settings istPump Out 4 Dip Switch Setting G Control Board Comp and FMR continue HGV energizes LLV and FM de energize NOTICE S4 dip switch 3 amp 4 must not be set to 3 off and 4 on Otherwise LED 4 turns on energizing WV and X11 relay This energizes the X10 relay which prevents the X12 relay and DV from energizing PM stops for 2 sec then PM and DV energize for 10 20 sec depending on pump out timer S4 dip switch 3 amp 4 setting When the pump out timer terminates pump out is complete The pump out frequency control S4 dip switch 5 amp 6 is factory set and generally no adjustment is required However the pump out frequency control can be set to have a pump out occur every cycle or every 2 5 10 cycles For details see III C 4 Pump Out Frequency Control S4 dip switch 5 amp 6 27 Pump Out Diagnosis In the freeze cycle before pump out see table above after 5 min of freeze disconnect CB black K5 connector FS connector Check that PM stops and re starts and that DV energizes and water is flowing down the drain through DV If PM does not stop and re start and DV does not energize check that CB LEDs 1 3 and 2 are on If not replace CB If LEDs 1 3 and 2 are on and PM and DV do not energize check for 115VAC at CB K1 5 DBU to neutral W If 115VAC is not present replace CB If 115VAC is present
70. se the thermistor sensor portion in a glass containing ice and water for 2 or 3 min 6 Disconnect the thermistor connector from CB K3 connector and check the resistance between thermistor leads Normal range 1 4 7 to 6 2 If outside the normal range replace the thermistor See IV B Component Service Information If within the normal range continue to the next step 7 Replace the thermistor in its correct position See IV B Component Service Information 8 Reconnect the thermistor connector to CB K3 connector 4 Remove the thermistor from the refrigerant tubing 9 Replace the control box cover in its correct position 10 Move the control switch to the ICE position 11 Replace the front panel in its correct position 12 Turn on the power supply 13 Once the harvest cycle starts Comp energizes begin timing the harvest cycle 14 The harvest timer and harvest cycle should terminate within 2 to 5 min If the harvest cycle does not terminate within 2 to 5 min replace CB Legend CB control board Comp compressor 36 Diagnostic Tables 1 No Ice Production No Ice Production Possible Cause 1 Power Supply a Off blown fuse or tripped breaker b Not within specifications a Blown 2 Fuse inside fused disconnect if any 3 Thermostatic Bin Control Tripped with bin filled with ice See 1 0 1 Thermostatic Bin Ambient temperature too cool Control Check Set too w
71. sition a DRAIN This appliance utilizes a pump out drain system When the service switch is active and placed in the DRAIN position power is supplied to the pump motor and drain valve b CIRCULATE When the service switch is active and placed in the CIRCULATE position power is supplied to the pump motor only This operation can be used to circulate cleaner for extended periods of time over the outside surface of the evaporator c WASH This appliance utilizes an electric solenoid operated cleaning bypass valve When the service switch is active and placed in the WASH position power is supplied to the pump motor and cleaning valve This operation is used to circulate cleaner and sanitizer over both the inside and outside of the evaporator 48 IV Refrigeration Circuit and Component Service Information WARNING This appliance should be diagnosed and repaired only by qualified service personnel to reduce the risk of death electric shock serious injury or fire Move the control switch to the OFF position and turn off the power supply Place the disconnect in the OFF position Lockout Tagout to prevent the power supply from being turned back on inadvertently CHOKING HAZARD Ensure all components fasteners and thumbscrews are securely in place after the icemaker is serviced Make sure that none have fallen into the dispenser unit ice storage bin Make sure all food zones in the icemaker and dispenser unit ic
72. t relay and Comp motor winding b HGV Diagnosis If Comp is energized and evaporator is not warming check that HGV energizes and opens Check for 115VAC at CB K1 2 P to neutral W If 115VAC is not present replace CB If 115VAC is present check for 115VAC at HGV coil and check HGV coil continuity Replace as needed LLV Diagnosis Confirm that LLV is de energized and closed not bypassing If energized replace CB If de energized and bypassing replace LLV d WRV Diagnosis Confirm WRV is not leaking by e Initial Harvest Cycle Termination Diagnosis When the thermistor reaches 48 F 9 C CB reads 3 9 from the thermistor and turns harvest termination over to the harvest timer S4 dip switch 1 amp 2 Check discharge line temperature For a thermistor check see Thermistor Check If 1 min fill cycle starts after harvest timer terminates check that FS is clean and operating properly see Float Switch Check and Cleaning If FS is closed CB proceeds to the next cycle If not replace CB Note The minimum total time allowed by CB for a complete harvest cycle is 2 min Maximum harvest time allowed is 20 min NOTICE On models without harvest pump timer relays S4 dip switch 7 must remain off Otherwise WV de energizes the last 50 seconds of harvest 6 Freeze Cycle LED 1 is on Comp and FMR continue PM FM and LLV energize WV and HGV de energize Appliance is held in freeze by a 5 min short c
73. teners and thumbscrews are securely in place after the appliance is serviced Make sure that none have fallen into the dispenser unit ice storage bin Make sure all food zones in the appliance and dispenser unit ice storage bin are clean after service The diagnostic procedure is a sequence check that allows you to diagnose the electrical system and components Before proceeding check for correct installation proper voltage per nameplate and adequate water supply Check CB using the steps in Control Board Check Check dip switch settings to assure that S4 dip switch 3 4 7 8 9 10 and S5 dip switch 1 through 5 are in the factory default position S4 dip switch 1 2 5 6 are cleaning adjustments and the settings are flexible For factory default settings see 1 Default Dip Switch Settings Note When checking high voltage 115VAC always choose a white W neutral wire to establish a good neutral connection When checking voltage from the CB K1 connector 10 pin connector pull CB K1 connector out slightly to allow room for multimeter test leads contact 1 Turn off the power supply then access the control box Move the control switch to the OFF position Clear any ice from BC 2 Check that the 115VAC 10A fuse is good 1 Control Board without Harvest Pump Timer Operation Diagnosis 3 Power On Turn on the power supply then move the control switch to the ICE position A 5 sec delay occurs
74. ter tank for the time determined by the pump out timer The pump out timer also acts in place of the harvest timer during cycles with a pump out The pump out timer is factory set and generally no adjustment is required The pump out timer control can be set to pump out for 10 or 20 seconds Sa Dip Switch Sting Time sec met water OFF Nos Son o 160 20 1 FF FF T1 Time to drain the water tank T2 Harvest timer at pump out 45 4 Pump Out Frequency Control S4 dip switch 5 amp 6 The pump out frequency control is factory set Generally no adjustment is required However where water quality is bad and the icemaker needs a pump out more often the pump out frequency can be adjusted The pump out frequency control can be set to have a pump out occur every cycle or every 2 5 or 10 cycles The first pump out is dependent on S4 dip switch 5 amp 6 See the table below S4 Dip Switch Setting Pump Out No 6 Frequency Every cycle After 2nd freeze cycle rr Every 2 cycles After 3rd freeze cycle Every 5 cycles After 6th freeze cycle Every 10 cycles After 11th freeze cycle 5 Harvest Pump Timer Operation S4 dip switch 7 NOTICE Factory set for proper operation Do not adjust Adjustment outside of the factory default setting may result in damage to the appliance Depending on the harvest pump timer setting the pump motor either stays off or is energized the last 50 seco
75. tor Pin 2 LED 2 off K1 Connector Pin 3 LED 3 X3 Relay LED 3 on K1 Connector Pin 5 LED 3 off K1 Connector Pin 4 energized in freeze LED 4 X4 Relay K1 Connector Pin 6 LED 1 X1 Relay K1 Connector Pin 1 9 Control Board e ALARM RESET Button S4 Dip Switch OU 00078209 xl oon 2 os P N 243792 01 ac Lu sx Q 2 H ALP D K5 2 9 4 599 K390 O gt gt o 0 jo oligo UN RED WHITE E 1 10 9 2 Connector Control Transformer 10 5VAC G Control Board Part Number 2A3792 01 42 OUTPUT TEST Button used to test relays on control board K3 white Connector Thermistor harvest control and high temperature safety K4 red Connector Mechanical Bin Control or K4 Jumper thermostatic bin control application S5 Dip Switch K5 black Connector Float Switch water level Label control board revision level indicated on label on side of relay A K1 Connector Pins 1 through 10 1 9 Magnetic Contactor or Compressor Relay 2 Hot Gas Valve 3 Fan Motor Liquid Line Valve 4 Pump Motor icemaking 5 Pump Motor harvest pump timer and pump out 6 Inlet Water Valve 7 10 Component Power Supply 8 Open B
76. tral W If 115 VAC is not present see B 1 or 2 3 b HPS Diagnosis If 115VAC is present check CT coil continuity Replace as needed For additional checks see II G 1 Ice Production 3 The OUTPUT TEST button provides a relay sequence test Make sure the control switch is in the ICE position then press the OUTPUT TEST button For the correct lighting sequence see the table below Note that the order of the LEDs from the outer edge of the control board is 1 4 3 2 Components e g compressor cycle during the test Control Correct LED Board Lighting Sequence Following the test the icemaker begins operation at the 1 minute fill cycle If the LEDs do not light as described above replace CB 4 To verify voltage output from CB to the components slide the CB K1 connector out far enough to allow multimeter lead contact With the icemaker in the cycle to be tested check output voltage from the corresponding pin on CB K1 connector to a neutral W wire If output voltage is not found and the appropriate LED is on replace CB Legend CB control board CT control transformer 30 D Bin Control Check 1 Thermostatic Bin Control Check TBC shuts down the icemaker within 10 sec when ice contacts the thermostatic bulb regardless of the cycle at activation NOTICE When the ambient temperature is below 45 F 7 C TBC opens and shuts down the appliance even if the ice storage bin is empty When BC is set
77. truction 1 Air Cooled MAH Thermostatic Expansion Valve Cleaning Valve Drain Valve Water Supply Inlet Spray Tubes Hot Gas Valve Inlet Water Valve B3 mm Thermostatic Bin Control Pump Motor a Control Switch Fan Motor High Pressure Switch Service Switch Float Switch Thermostatic Bin Control 5 Compressor Bracket amp Bulb Holder Control Box Model Shown KML 351MAH os I E Us a Mechanical Bin Control and Bracket Model Shown KMD 460MAH 2 Water Cooled MWH Thermostatic Valve Expansion Valve Drain Valve Cleaning Valve Inlet Water Valve Spray Tubes Water Supply Inlet Water Regulating Condenser High Pressure Switch Thermostatic Bin Control Control Box Pump Motor Float Switch Thermostatic Bin Control Bracket amp Bulb Holder Control Switch Model Shown KML 451MAH Compressor Drier Hot Gas Valve Service Switch m a gt Is gt s n WS ce n Ale f X NE Sq 5 EES jon Sat amp I n n SS al P Uu L
78. using a screwdriver to pry up on the spring retainer underneath the spring While holding the valve open blow out the condenser using the compressed air or carbon dioxide supply until water stops coming out 6 Close the drain valve s 7 Replace the right side panel and front panel in their correct positions 55 VII Disposal The appliance contains refrigerant and must be disposed of in accordance with applicable national state and local codes and regulations Refrigerant must be recovered by properly certified service personnel 56 VIII Technical Information We reserve the right to make changes in specifications and design without prior notice A Specification and Performance Data Sheets Pressure data is recorded at 5 min into freezing cycle The data not in bold should be used for reference only 1 KMD 460MAH Specification Sheet AC SUPPLY VOLTAGE 115 60 1 AMPERAGE 10 0 A 5 Min Freeze AT 104 F WT 80 F MINIMUM CIRCUIT AMPACITY 15A MAXIMUM FUSE SIZE 15A ELECTRIC amp WATER CONSUMPTION 90 70 70 50 ELECTRIC W kWH 100 Ibs 880 5 48 810 4 28 WATER gal 24HR gal 100 Ibs 73 18 9 192 42 1 ICE PRODUCTION PER CYCLE 9 6 Ibs 4 3 kg 432pcs BIN CONTROL SYSTEM Mechanical Bin Control REFRIGERANT CHARGE R404A 1 Ib 5 2 oz 600g Performance Data Sheet APPROXIMATE ICE PRODUCTION PER AMBIENT TEMP WATER TEMP F C 24 HR F C 50 10 70 21 90 32 70 21 80 27 90 32 Ibs day kg
79. utral W If 115VAC is not present replace CB If 115VAC is present and PM is de energized check for 115VAC at control switch 5 Y to neutral W If 115VAC is present at CB K1 4 and not at control switch 5 Y check control switch continuity between 5 Y and 6 R Replace as needed If 115VAC is present at control switch 5 Y to neutral W check PM capacitor and motor winding continuity e FM and LLV Diagnosis If FM or LLV does not energize check for 115VAC at CB K1 3 BK to neutral W If 115VAC is not present replace CB If 115VAC is present For FM check capacitor motor winding and blade for binding For LLV check coil voltage and continuity f Refrigerant Pressures HM and TXV Diagnosis If evaporator is still not cooling check refrigerant pressures See VIII A Specification and Performance Data Sheets Next check HM operation If refrigeration pressures are above HM setpoint and HM is bypassing replace HM Check TXV for proper operation Remove TXV bulb and hold it in your hand refrigerant low side pressure should rise place TXV bulb in ice water refrigerant low side pressure should drop A 10 to 15 pound pressure swing between warm and cold conditions indicate a good TXV If a 10 to 15 pound swing is not present replace TXV 9 WRV Diagnosis WRV is factory set and generally no adjustment is required If WRV fails to open in freeze check for proper refrigerant pressures See VIII A Specification a
80. uuJ8u L 10 013 duinge 1 OL 8 6 dip UMS di 5 Jeuun 22991 Sui Oz 10 lt 21 honge i ae ieu Bases SOINUILU 9 JOYEM 1 WNWIXEN e 2 IIA sdejs 9 o 2 1n o duing p 9J9 2 ezoo 2 912A9 1seAJEH 71 21219 4 INOUJIM 9 1 Control Board without Harvest Pump T 13 2 Control Board with Harvest Pump Timer Operation OU JO seoeyuns APISINO pue APISUI eui u1oq Jeziniues pu pesn SI SIY pue oi perjddns si 460g JOYEM 19 UI AM pinbiI AT1 sef 10 4 Jo spoued JO Joyelodena jo adejins apisino JOAO eje noJio pesn siu Ajuo 1 si ALVINOYIO JOJEM SUIP SIU pue y perjddns si 1201 54 uej HIN A Jossejduio2 duio uonisod 32IAH3S 941 SI YONMS 2 eui pazibieuy sjueuoduio puasa uonounj JO sirejep 10 uomneuuoJul 99S PU 1YIN
81. voltage at condenser unit If 115VAC is not present check field wiring connections If 115VAC is present check FMR capacitor motor winding and fan blade for binding c WV HGV Diagnosis If WV is energized check for 115VAC at CB K1 6 to neutral W If 115VAC is present after PM energizes replace CB If 115VAC is not present replace WV bypassing If HGV did not de energize check for 115VAC at CB K1 2 P to neutral W If 115VAC is present after PM energizes replace CB If 115VAC is not present replace HGV bypassing d PM Diagnosis Confirm water is flowing over evaporator from PM and not WV If PM de energizes once freeze begins check for 115VAC at CB K1 4 to neutral W If 115VAC is not present replace CB If 115VAC is present and PM is de energized check for 115VAC at control switch 5 Y to neutral W If 115VAC is present at CB K1 4 and not at control switch 5 Y check control switch continuity between 5 Y and 6 R Replace as needed If 115VAC is present at control switch 5 Y to neutral W check PM capacitor and motor winding continuity e FM and LLV Diagnosis If FM or LLV does not energize check for 115VAC at CB K1 3 BK to neutral W If 115VAC is not present replace CB If 115VAC is present For FM check capacitor motor winding and blade for binding For LLV check coil voltage and continuity f Refrigerant Pressures HM and TXV Diagnosis If evaporator is still not co
82. witch 5 4 6 46 5 Harvest Pump Timer Operation S4 dip switch 7 46 6 Factory Use 54 dip sWwiteh Liceat wae 46 7 Freeze Timer 94 dip switch 9 amp 10 mma bmw 47 8 Float Switch Selector S5 dip switch 1 47 9 Refill Counter S5 dip switch 2 3 and 5 Program Selector 4 47 D 48 Control 48 a E E ENEDA 48 ccn 48 Pr CIRCULATE 48 48 IV Refrigeration Circuit and Component Service 49 A Refrigeration Circuit Service Information oooooooooo 49 B Component Service Information Poi RR arr Re 52 C Water Regulating Valve Adjustment water cooled model 52 LAM acie NN 53 VI Preparing the Appliance for Periods of 54 WIL DISD OSA c M 56 Viik Technical FORT TEN 57 A Specification and Performance Data
83. xyeule Sjueuoduuoo PONE dee pue 9497 HO Jnyewaa ung lt uwopinus Heys e2uenbes eoejd ui si Jjeduunf py uo 93 079 Od 3LON sjueuoduuoo 381 uedo 291 HAL 91009 951 1 114 exnuny r 71 01 AOA 7L ye 1115 Jexeujeo 981 ON 9 91 89 pezi amp jeue ep sjueuoduJoo Jexeuie2 09S OL UUM meys eouenbes uwopinug uwopinus uMop sinus 2g 61001000 Jaye uoneiedo OGL pue lt umopinys 15 B Service Diagnosis WARNING The appliance should be diagnosed and repaired only by qualified service personnel to reduce the risk of death electric shock serious injury or fire Risk of electric shock Control switch in OFF position does not de energize all loads Use extreme caution and exercise safe electrical practices Moving parts e g fan blade can crush and cut Keep hands clear Before servicing the appliance move the control switch to the OFF position and turn off the power supply CHOKING HAZARD Ensure all components fas
84. y for two cycles in a row LLV not opening low charge HM not bypassing or inefficient Comp To reset the above safeties press the ALARM RESET button with the power supply on Low Voltage Red LED turns off if voltage protection operates 92Vac 5 or less The control voltage safeties automatically reset when High Voltage voltage is corrected 147Vac 5 or more Legend Comp compressor DV drain valve FM fan motor FMR fan motor remote FS float switch HGV hot gas valve HM headmaster C P R LLV liquid line valve PM pump motor SR service relay TXV thermostatic expansion valve WRV water regulating valve WV inlet water valve 43 C Settings and Adjustments NOTICE Dip switches are factory set Failure to maintain factory settings may adversely affect performance and warranty coverage For more information contact your Hoshizaki Service Center 1 Default Dip Switch Settings The dip switches are factory adjusted to the following positions a G Control Board without Harvest Pump Timer Operation Mode Auxiliary Godel 1 a 6 7 8 9 b G Control Board with Harvest Pump Timer Operation Model Auxiliary Code 1 2 3 4 5 6 7 8 9 10 c Float Switch Selector Refill Counter Program Selector wow S4 Dip Switch S5 Dip Switch Do Not Agjust Program Refill Counter Selector 4 2 3 and 5 Float Switch Selector 1
85. ycle protection timer After 5 min timer terminates and FS opens freeze cycle terminates a Freeze Cycle Diagnosis Confirm Comp and FMR continue Confirm that PM FM and LLV energize Confirm WRV opens Next confirm WV and HGV de energize During the first 5 min of freeze confirm evaporator is cooling If not confirm WV de energized not leaking by HGV de energized not bypassing LLV and FM energize TXV and HM operate correctly WRV opens Comp is efficient and refrigerant charge is correct See VIII A Specification and Performance Data Sheets b Comp and FMR Diagnosis If Comp and FMR de energize once freeze begins check that appliance has not shut off on HPS POWER OK LED off If so check 3 b HPS Diagnosis If POWER OK LED is on check for 115VAC at CB K1 1 V or 9 V to neutral W If 115VAC is not present and LED 1 is on replace CB If 115VAC is present check for 115VAC at CR or MC coil If 115VAC is present check CR or MC coil and contact continuity Replace as needed If CR or MC is ok check Comp external overload start relay and start and run capacitors Next check Comp motor winding continuity If Comp is energized but evaporator is not cooling check for an inefficient Comp See VIILA Specification and Performance Data Sheets If Comp is energized but FMR is not check for 115VAC at the FMR junction box If 115VAC is not present check icemaker wiring connections If 115 VAC is present check for
86. ystem 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 refrigerant access valves IMPORTANT The vacuum level and vacuum pump may be the same as those for current refrigerants However the rubber hose and gauge manifold to be used for evacuation and refrigerant charge should be exclusively for POE oils 2 Turn on the vacuum pump Open the gauge manifold valves Never allow the oil in the vacuum pump to flow backwards 3 Allow the vacuum pump to pull down to a 29 9 Hg vacuum Evacuating period depends on pump capacity 50 4 Close the low side valve and high side valve the gauge manifold 5 Disconnect the gauge manifold hose from the vacuum pump and attach it to a refrigerant service cylinder Remember to loosen the connection and purge the air from the hose For the required refrigerant charge see the rating label inside the icemaker Hoshizaki recommends only virgin refrigerant or reclaimed refrigerant which meets AHRI Standard 700 latest edition be used 6 A liquid charge is required when charging an R 404A system to prevent fractionation Place the service cylinder on the scales if the service cylinder is not equipped with a dip tube invert the service cyl

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