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Hoshizaki KM-900MAH, Service Manual

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Hoshizaki KM-900MAH Service Manual Download Page 19

19

(Control Products HOS-001A Board)

The application switch located between relay X3 & X4 must be set to match the original
board application.  Place this switch in the ALP position if there is no white wire supplied
to the K1 connector.  If there is a white wire, place the switch in the C position.  If this
switch is placed in the wrong position, either the compressor contactor will remain ener-
gized with the control switch OFF, or the unit will not start.

The dip switches should be adjusted per the adjustment chart published in the Tech
Specs book. Number 8 must remain in the OFF position.

Summary of Contents for KM-900MAH

Page 1: ...6 59 0 18 668 7 2 2 5 2 2 3 4 5 2 5HOLDELOLW LV D EHDXWLIXO WKLQJ70 5 9 6 180 5 73105...

Page 2: ...1940 Technical Service 770 487 2331 Fax 770 487 3360 NOTE To expedite assistance all correspondence communication MUST include the following information Model Number Serial Number Complete and detail...

Page 3: ...OARD 27 3 MECHANICAL BIN CONTROL 28 a PROXIMITY SWITCH 28 b EXPLANATION OF OPERATION 28 c TROUBLESHOOTING 29 III TECHNICAL INFORMATION 30 1 WATER CIRCUIT AND REFRIGERANT CIRCUIT 30 a KM 900MAH Air coo...

Page 4: ...ODEL ONLY 61 9 ADJUSTMENT OF WATER REGULATING VALVE WATER COOLED MODEL ONLY 62 10 REMOVAL AND REPLACEMENT OF CONDENSING PRESSURE REGULATOR C P R REMOTE AIR COOLED MODEL ONLY 63 11 REMOVAL AND REPLACEM...

Page 5: ...Rear WEIGHT Net 216 lbs 98 kg Shipping 282 lbs 128 kg CONNECTIONS ELECTRIC Permanent Connection WATER SUPPLY Inlet 1 2 FPT DRAIN Outlet 3 4 FPT CUBE CONTROL SYSTEM Float Switch HARVESTING CONTROL SYS...

Page 6: ...6 kg CONNECTIONS ELECTRIC Permanent Connection WATER SUPPLY Inlet 1 2 FPT Condenser Inlet 1 2 FPT DRAIN Outlet 3 4 FPT Condenser Outlet 3 8 FPT 3 8 OD Pipe CUBE CONTROL SYSTEM Float Switch HARVESTING...

Page 7: ...277 lbs 126 kg CONNECTIONS ELECTRIC Permanent Connection WATER SUPPLY Inlet 1 2 FPT Condenser Inlet 1 2 FPT DRAIN Outlet 3 4 FPT Condenser Outlet 3 8 FPT 3 8 OD Pipe CUBE CONTROL SYSTEM Float Switch...

Page 8: ...ipe CUBE CONTROL SYSTEM Float Switch HARVESTING CONTROL SYSTEM Hot Gas and Water Thermistor and Timer ICE MAKING WATER CONTROL Timer Controlled Overflow Pipe COOLING WATER CONTROL N A BIN CONTROL SYST...

Page 9: ...anent Connection WATER SUPPLY Inlet 1 2 FPT DRAIN Outlet 3 4 FPT 3 8 OD Pipe CUBE CONTROL SYSTEM Float Switch HARVESTING CONTROL SYSTEM Hot Gas and Water Thermistor and Timer ICE MAKING WATER CONTROL...

Page 10: ...10 5 CONDENSING UNIT URC 12F...

Page 11: ...TRICAL CONDENSER HEAD PRESSURE CONTROL AMBIENT CONDITION Galvanized Steel 35 11 16 x 15 11 16 x 21 15 16 907 2 x 398 x 557 8 mm R404A 4 lbs 7 oz 2000 g Net 80 lbs 36 kg Shipping 87 lbs 39 kg One Shot...

Page 12: ...12 II GENERAL INFORMATION 1 CONSTRUCTION a KM 900MAH Models with Thermostat Models with Mechanical Bin Control...

Page 13: ...13 b KM 900MWH Models with Thermostat Models with Mechanical Bin Control...

Page 14: ...14 c KM 900MRH Models with Thermostat Models with Mechanical Bin Control...

Page 15: ...15 d KM 900MRH3 Models with Thermostat Models with Mechanical Bin Control...

Page 16: ...ectronic devices on the board or the back of the board to prevent damage to the board 4 Do not change wiring and connections Do not misconnect K3 K4 and K5 because the same connector is used for the T...

Page 17: ...revent this type of failure the Controller Board checks the position of the Float Switch at the end of the initial one minute water fill cycle and at the end of each defrost cycle If the Float Switch...

Page 18: ...ergizes Check for F S stuck closed up WV leaking by HGV leaking by TXV not feeding properly low charge or inefficient compressor To manually reset the above safeties depress white alarm reset button w...

Page 19: ...white wire supplied to the K1 connector If there is a white wire place the switch in the C position If this switch is placed in the wrong position either the compressor contactor will remain ener gize...

Page 20: ...t 5 minutes in freeze cycle Ready to complete freeze cycle when Float Switch circuit opens 4 Defrost Timer stops counting Defrost cycle is completed and freeze cycle starts IMPORTANT Board never accep...

Page 21: ...NT Water Valve opening is limited to 6 minutes 5 After the first 5 minutes in freeze cycle Ready to complete freeze cycle when Float Switch circuit opens 4 Defrost Timer stops counting Defrost cycle i...

Page 22: ...minutes 4 After the first 5 minutes in freeze cycle Ready to complete freeze cycle when Float Switch circuit opens 3 Defrost Timer stops counting Defrost cycle is completed and freeze cycle starts IMP...

Page 23: ...eration in 2 seconds Then the Pump Motor drains the Water Tank for the time determined by the Drain Timer The Drain Timer also determines the time to restrain completion of a defrost cycle i e the min...

Page 24: ...0 1 633 Check a thermistor for resistance by using the following procedures i Disconnect the connector K3 on the board ii Remove the Thermistor See V 11 REMOVAL AND REPLACEMENT OF THERMISTOR iii Immer...

Page 25: ...in the Water Tank every 10 cycles and no adjustment is required However where water quality is bad and the icemaker needs a pump drain more often the Drain Counter can be adjusted as shown in the tabl...

Page 26: ...ithin 10 seconds after ice contacts the Bin Control Thermostat Bulb SETTING FREQUENCY Dip Switch Dip Switch No 5 No 6 OFF OFF every cycle ON OFF every 2 cycles OFF ON every 5 cycles ON ON every 10 cyc...

Page 27: ...t a 1 5 k 3 5 k resistor to the Connector K3 pins 1 and 2 and energize the unit After the 1 minute 5 second water supply cycle and the 2 minute 10 second defrost cycle the unit should start the freeze...

Page 28: ...ntrol board to shut down the unit iii When the bin control is in the normal position bin is not full a 7 9 K reading is sent to the control board to continue operation 2 During operation the controlle...

Page 29: ...related issues are resolved ii Dip switch No 7 should be in the on position If the switch is in the off position the controller board will not receive input from the bin control iii Move the lever to...

Page 30: ...30 III TECHNICAL INFORMATION 1 WATER CIRCUIT AND REFRIGERANT CIRCUIT a KM 900MAH...

Page 31: ...31 b KM 900MWH...

Page 32: ...32 c KM 900MRH and KM 900MRH3...

Page 33: ...33 2 WIRINGDIAGRAMS a KM 900MAH With Mechanical Bin Control Aux Codes L 0 through M 1 Note Pressure Switch Cut out 412 PSIG Cut in 327 21 PSIG 21 0...

Page 34: ...34 KM 900MAH With Thermostat Aux Codes M 2 and after Note Pressure Switch Cut out 412 PSIG Cut in 327 21 PSIG 21 0...

Page 35: ...35 b KM 900MWH With Mechanical Bin Control Aux Codes L 0 through M 3 Note Pressure Switch Cut out 384 PSIG Cut in 284 21 PSIG 21 0...

Page 36: ...36 KM 900MWH With Thermostat Aux Codes M 4 and after Note Pressure Switch Cut out 384 PSIG Cut in 284 21 PSIG 21 0...

Page 37: ...37 c KM 900MRH With Mechanical Bin Control Aux Codes L 0 through M 1 Note Pressure Switch Cut out 412 PSIG Cut in 327 21 PSIG 21 0...

Page 38: ...th Thermostat Aux Codes M 2 and after Note Pressure Switch Cut out 412 PSIG Cut in 327 21 PSIG 21 0 Contactorappearancechangedduring2006 Earlier style is shown here and new style is shown above in the...

Page 39: ...39 d KM 900MRH3 With Mechanical Bin Control Aux Codes L 0 through M 0 Note Pressure Switch Cut out 412 PSIG Cut in 327 21 PSIG 21 0...

Page 40: ...40 KM 900MRH3 With Thermostat Aux Codes M 1 and after Note Pressure Switch Cut out 412 PSIG Cut in 327 21 PSIG 21 0...

Page 41: ...41 3 TIMING CHART...

Page 42: ...42...

Page 43: ...0 32 min 100 38 70 21 80 27 90 32 min 100 38 70 21 245 17 2 267 18 8 296 20 8 80 27 262 18 4 296 20 8 324 22 7 90 32 267 18 8 320 22 5 349 24 5 PSIG kg cm 2 G 100 38 272 19 1 327 23 0 375 26 4 70 21 3...

Page 44: ...80 19 7 285 20 0 298 21 0 PSIG kg cm2 G 100 38 285 20 0 288 20 3 310 21 8 70 21 37 2 6 38 2 7 41 2 9 80 27 38 2 7 40 2 8 43 3 0 90 32 38 2 7 42 3 0 45 3 1 PSIG kg cm2 G 100 38 39 2 7 43 3 0 47 3 3 WAT...

Page 45: ...280 19 7 280 19 7 290 20 4 PSIG kg cm 2 G 100 38 284 20 0 284 20 0 300 21 1 70 21 36 2 5 38 2 7 39 2 7 80 27 38 2 6 41 2 9 41 2 9 90 32 38 2 7 43 3 0 44 3 1 PSIG kg cm 2 G 100 38 38 2 6 43 3 0 44 3 1...

Page 46: ...4 255 17 9 80 27 230 16 2 251 17 6 274 19 3 90 32 233 16 4 265 18 6 288 20 3 PSIG kg cm 2 G 100 38 239 16 8 270 19 0 310 21 8 70 21 32 2 2 34 2 4 37 2 6 80 27 34 2 4 37 2 6 40 2 8 90 32 34 2 4 40 2 8...

Page 47: ...6 5 254 17 9 80 27 233 16 4 249 17 5 270 19 0 90 32 235 16 5 260 18 3 281 19 7 PSIG kg cm 2 G 100 38 241 16 9 265 18 6 300 21 1 70 21 30 2 1 32 2 3 35 2 5 80 27 32 2 2 35 2 5 38 2 7 90 32 32 2 3 38 2...

Page 48: ...ce f Transformer 1 Thermal fuse blown out 1 Replace or coil winding opened g Wiring to 1 Loose connections or 1 Check for continuity and Controller Board open replace h Thermistor 1 Leads short circui...

Page 49: ...mended pressure cooled model only 5 Fan not operating Except 5 See chart 1 6 water cooled model 6 Refrigerant line or 6 Clean and replace Drier components plugged c Water Regulator 1 Set too high 1 Ad...

Page 50: ...lace 5 Defective or bound impeller 5 Replace and clean 6 Mechanical Seal worn out 6 Check and replace e Controller Board 1 Defective 1 See II 2 e CHECKING CONTROLLER BOARD 6 Fan Motor will a Fan Motor...

Page 51: ...get does not fall recommended pressure into bin in c Water Solenoid 1 Dirty mesh filter or orifice 1 Clean harvest cycle Valve 2 Diaphragm does not close 2 Check for water leaks with icemaker off d Am...

Page 52: ...r 1 Replace surfaces 3 Ice in storage a Bin Drain 1 Plugged 1 Clean bin often melts PROBLEM POSSIBLE CAUSE REMEDY 1 Small Cube a Ice Cube Guide 1 Out of position 1 Place in position Circulated water f...

Page 53: ...ide and one on the high side line Using proper refrigerant practices recover the refrigerant from the Access Valves and store it in an approved container Do not discharge the refrigerant into the atmo...

Page 54: ...Hoses and Service Mani fold 10 Cap the Access Valves to prevent a possible leak 2 BRAZING DANGER 1 Refrigerant R 404A itself is not flammable at atmospheric pressure and temperatures up to 176 F 2 Ref...

Page 55: ...ower supply 2 Remove the panels 3 Recover the refrigerant and store it in an approved container 4 Remove the Terminal Cover on the Compressor and disconnect the Compressor Wiring 5 Remove the Discharg...

Page 56: ...els see the Nameplate for the required refrigerant charge For remote air cooled models see the Charge Label in the machine compartment 16 Connect the Terminals and replace the Terminal Cover in its co...

Page 57: ...s using nitrogen gas 140 PSIG and soap bubbles 7 Evacuate the system and charge it with refrigerant For air cooled and water cooled models see the Nameplate for the required refrigerant charge For rem...

Page 58: ...ks using nitrogen gas 140 PSIG and soap bubbles 9 Evacuate the system and charge it with refrigerant For air cooled and water cooled models see the Nameplate for the required refrigerant charge For re...

Page 59: ...to prevent the valve from overheating Do not braze with the valve body exceeding 250 F 7 Install the new Drier 8 Check for leaks using nitrogen gas 140 PSIG and soap bubbles 9 Evacuate the system and...

Page 60: ...is 5 Remove the Insulation Tube and disconnect the Evaporator Inlet Tubing at the Tee next to the Expansion Valve 6 Lift up the Evaporator and disconnect the Evaporator Outlet Tubing 7 Install the new...

Page 61: ...5 Disconnect the Capillary Tube at the Condenser outlet using brazing equipment 6 Disconnect the Flare connections of the valve 7 Remove the screws and the valve from the Bracket 8 Install the new va...

Page 62: ...e system Or prepare a thermometer to check for the condenser drain temperature 2 Rotate the adjustment screw by using a flat blade screwdriver so that the pressure gauge shows 270 PSIG or the thermome...

Page 63: ...off the stub on the dome to release the dome charge 5 Disconnect the C P R using brazing equipment 6 Install the new C P R Use nitrogen gas at the pressure of 3 4 PSIG when brazing the C P R WARNING...

Page 64: ...d 5 Remove the Plastic Cable Ties Foam Insulation Thermistor Holder and Thermistor See Fig 2 6 Scrape away the old sealant on the Thermistor Holder and the Suction Pipe 7 Wipe off moisture or condensa...

Page 65: ...e When replacing a Fan Motor with defective winding it is recommended that a new capacitor be installed 1 Turn off the power supply 2 Remove the panels 3 Remove the Junction Box Cover from the remote...

Page 66: ...and replace the removed parts in the reverse order of which they were removed 9 Open the Water Supply Line Shut off Valve 10 Turn on the power supply 11 Check for leaks 12 Replace the Front Panel in...

Page 67: ...check for leaks 14 Replace the Base Cover 15 Replace the Front Panel in its correct position 15 REMOVAL AND REPLACEMENT OF SPRAY TUBES 1 Turn off the power supply 2 Remove the Front Panel and the Ins...

Page 68: ...ol Switch to the OFF position unless the icemaker will be at sub freezing temperatures 1 On water cooled model only first remove the water from the water cooled condenser 1 Remove the Front Panel 2 Mo...

Page 69: ...ioxide supply to the Potable Water Line Drain Valve 7 Move the Control Switch to the ICE position 8 Blow the potable water line out using compressed air or carbon dioxide 3 Drain the Potable Water Tan...

Page 70: ...ar liquid proof gloves for safe handling of the cleaning and sanitizing solution This will prevent irritation in case the solution comes into contact with skin IMPORTANT 1 The Cleaning Valve is used t...

Page 71: ...he removed parts in their correct positions 8 Pour the cleaning solution into the Water Tank 9 Fully open the Cleaning Valve on the left side wall of the machine compartment 10 Move the Control Switch...

Page 72: ...n you proceed to b SANITIZING PROCEDURE 29 Repeat the above steps 17 through 28 three more times to rinse thoroughly Note If you do not sanitize the icemaker go to step 9 in b SANITIZING PROCEDURE b S...

Page 73: ...ruction manual and labels provided with the icemaker 1 Stainless Steel Exterior To prevent corrosion wipe the exterior occasionally with a clean and soft cloth Use a damp cloth containing a neutral cl...

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