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Hoshizaki KMD-700MAH, Руководство по обслуживанию

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27

1) Defrost Control

A thermistor (semiconductor) is used for a defrost control sensor. The resistance varies
depending on the suction line temperatures. The thermistor detects the temperature of
the evaporator outlet to start the defrost timer. No adjustment is required. If necessary,
check for resistance between thermistor leads, and visually check the thermistor
mounting, located on the suction line next to the evaporator outlet.

Temperature (°F)                      Resistance (k

Ω

)

  0

14.401

10

10.613

32

  6.000

50

  3.871

70

  2.474

90

  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) Immerse the thermistor sensor portion in a glass containing ice and water for 2 or 3

minutes.

(iv) Check for a resistance between thermistor leads.

Normal reading is within 3.5 to 7 k

Ω

. Replace the thermistor if it exceeds the normal

reading.

2) Defrost Timer

No adjustment is required under normal use, as the defrost timer is adjusted to the suit-
able position. However, if necessary when all the ice formed on the evaporator does not
fall into the bin in the harvest cycle, adjust the defrost timer to longer setting by adjusting
the dip switch (no. 1 & 2) on the controller board.

SETTING

TIME

Dip Switch

Dip Switch

No. 1

No. 2

OFF

OFF

  60 seconds

ON

OFF

  90 seconds

OFF

ON

120 seconds

ON

ON

180 seconds

Содержание KMD-700MAH

Страница 1: ...SERVICE MANUAL KMD 700MAH KMD 700MWH KMD 700MRH KMD 900MAH KMD 900MWH KMD 900MRH MODULAR CRESCENT CUBER Reliability is a beautiful thingTM ITEM 73107 REVISED July 28 2006 ISSUED June 2 2003...

Страница 2: ...487 2331 Fax 770 487 3360 Web Site www hoshizakiamerica com NOTE To expedite assistance all correspondence communication MUST include the following information Model Number Serial Number Complete and...

Страница 3: ...19 b Controller Board 19 c Sequence 23 d Controls and Adjustments 26 e Checking the Controller Board 30 3 Mechanical Bin Control 31 a Proximity Switch 31 b Explanation of Operation 31 c Troubleshootin...

Страница 4: ...alve and Line Valve 62 7 Removal and Replacement of Evaporator 64 8 Removal and Replacement of Water Regulating Valve Water Cooled Model Only 65 9 Adjustment of Water Regulating Valve Water Cooled Mod...

Страница 5: ...et 217 lbs 98 kg Shipping 249 lbs 113 kg CONNECTIONS ELECTRIC Permanent Connection WATER SUPPLY Inlet 1 2 FPT DRAIN Outlet 3 4 FPT 5 8 OD Tube CUBE CONTROL SYSTEM Float Switch HARVESTING CONTROL SYSTE...

Страница 6: ...kg Shipping 249 lbs 113 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 5 8 OD Tube CUBE CONTROL SYSTEM Fl...

Страница 7: ...IC Permanent Connection WATER SUPPLY Inlet 1 2 FPT DRAIN Outlet 3 4 FPT 5 8 OD Tube CUBE CONTROL SYSTEM Float Switch HARVESTING CONTROL SYSTEM Hot Gas and Water Thermistor and Timer ICE MAKING WATER C...

Страница 8: ...109 kg Shipping 278 lbs 126 kg CONNECTIONS ELECTRIC Permanent Connection WATER SUPPLY Inlet 1 2 FPT DRAIN Outlet 3 4 FPT 5 8 OD Tube CUBE CONTROL SYSTEM Float Switch HARVESTING CONTROL SYSTEM Hot Gas...

Страница 9: ...kg Shipping 251 lbs 114 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 5 8 OD Tube CUBE CONTROL SYSTEM F...

Страница 10: ...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 SYSTEM...

Страница 11: ...11 7 Condensing Unit URC 12F...

Страница 12: ...ELECTRICAL CONDENSER HEADPRESSURECONTROL AMBIENTCONDITION 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 OneShotC...

Страница 13: ...al Information 1 Construction a KMD 700MAH CONTROL BOX SPRAY TUBE FLOAT SWITCH WATER PUMP COMPRESSOR BIN CONTROL DRIER CONDENSER FAN MOTOR CONDENSER JUNCTION BOX HOT GAS VALVE WATER SUPPLY INLET EXPAN...

Страница 14: ...14 b KMD 700MWH WATER REGULATOR CONDENSER CONTROL BOX SPRAY TUBE FLOAT SWITCH WATER PUMP COMPRESSOR BIN CONTROL DRIER JUNCTION BOX HOT GAS VALVE WATER SUPPLY INLET EXPANSION VALVE...

Страница 15: ...15 c KMD 700MRH CONTROL BOX SPRAY TUBE FLOAT SWITCH WATER PUMP COMPRESSOR BIN CONTROL DRIER RECEIVER TANK JUNCTION BOX HOT GAS VALVE WATER SUPPLY INLET EXPANSION VALVE LINE VALVE...

Страница 16: ...16 d KMD 900MAH CONTROL BOX SPRAY TUBE FLOAT SWITCH WATER PUMP COMPRESSOR BIN CONTROL DRIER CONDENSER FAN MOTOR CONDENSER JUNCTION BOX HOT GAS VALVE WATER SUPPLY INLET EXPANSION VALVE...

Страница 17: ...17 e KMD 900MWH WATER REGULATOR CONDENSER CONTROL BOX SPRAY TUBE FLOAT SWITCH WATER PUMP COMPRESSOR BIN CONTROL DRIER JUNCTION BOX HOT GAS VALVE WATER SUPPLY INLET EXPANSION VALVE...

Страница 18: ...18 f KMD 900MRH CONTROL BOX SPRAY TUBE FLOAT SWITCH WATER PUMP COMPRESSOR BIN CONTROL DRIER RECEIVER TANK JUNCTION BOX HOT GAS VALVE WATER SUPPLY INLET EXPANSION VALVE LINE VALVE...

Страница 19: ...ch the electronic 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...

Страница 20: ...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...

Страница 21: ...of Alarm Notes 1 High Evaporator Temp temperature 127 F Check for defrost problem stuck HGV or relay hot water entering unit stuck headmaster or shorted thermistor 2 Defrost Backup Timer defrost 20 m...

Страница 22: ...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 energized...

Страница 23: ...he first 2 minutes in defrost cycle 2 Defrost cycle time is limited to 20 minutes even if defrost timer does not stop counting 5 After first 5 minutes in freeze cycle cycle can complete when float swi...

Страница 24: ...ORTANT 1 Board never accepts defrost completion signal within the first 2 minutes in defrost cycle 2 Defrost cycle time is limited to 20 minutes even if defrost timer does not stop counting 5 After fi...

Страница 25: ...mpletion signal within the first 2 minutes in defrost cycle 2 Defrost cycle time is limited to 20 minutes even if defrost timer does not stop counting 4 After first 5 minutes in freeze cycle cycle can...

Страница 26: ...d 4 Used for adjustment of the drain timer When a freeze cycle is completed the pump motor stops and the icemaker resumes operation in 2 seconds Then the pump motor drains the water tank for the time...

Страница 27: ...he connector K3 on the board ii Remove the thermistor See V 11 Removal and Replacement of Thermistor iii Immerse the thermistor sensor portion in a glass containing ice and water for 2 or 3 minutes iv...

Страница 28: ...drain the water tank T2 Time to restrain defrost completion 4 Drain Counter The drain counter is factory adjusted to drain the water tank every 10 cycles and no adjustment is required However where w...

Страница 29: ...FF Check the adjustment chart published in the Tech Specs for proper settings If the old board does not have these two dip switches only 8 instead of 10 leave setting as OFF OFF SETTING TIME Dip Switc...

Страница 30: ...n for normal operation e Checking the Controller Board 1 Visually check the sequence with the icemaker operating 2 Visually check the controller board by using the following procedures i Adjust the de...

Страница 31: ...ontroller board ii When the bin control is activated in the bin full position pushed to the right a 15 8 K signal will be sent to the control board to shut down the unit iii When the bin control is in...

Страница 32: ...that non bin control 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...

Страница 33: ...33 III Technical Information 1 Water Circuit and Refrigerant Circuit a KMD 700MAH and KMD 900MAH Note KMD 900M_H models have two expansion valves...

Страница 34: ...34 b KMD 700MWH and KMD 900MWH Note KMD 900M_H models have two expansion valves...

Страница 35: ...35 c KMD 700MRH and KMD 900MRH Note KMD 900M_H models have two expansion valves...

Страница 36: ...36 2 Wiring Diagrams a1 KMD 700MAH and KMD 700MWH auxiliary code R 0 and earlier Note Pressure Switch MAH Cut out 412 PSIG Cut in 327 21 PSIG 21 0 21 0 MWH Cut out 384 PSIG Cut in 284 21 PSIG...

Страница 37: ...37 a2 KMD 700MAH and KMD 700MWH auxiliary code R 1 and later Note Pressure Switch MAH Cut out 412 PSIG Cut in 327 21 PSIG 21 0 21 0 MWH Cut out 384 PSIG Cut in 284 21 PSIG...

Страница 38: ...38 b1 KMD 700MRH auxiliary code R 0 and earlier Note Pressure Switch Cut out 412 PSIG Cut in 327 21 PSIG 21 0...

Страница 39: ...39 b2 KMD 700MRH auxiliary code R 1 and later Note Pressure Switch Cut out 412 PSIG Cut in 327 21 PSIG 21 0...

Страница 40: ...40 c1 KMD 900MAH and KMD 900MWH auxiliary code R 0 and earlier Note Pressure Switch MAH Cut out 412 PSIG Cut in 327 21 PSIG 21 0 21 0 MWH Cut out 384 PSIG Cut in 284 21 PSIG...

Страница 41: ...41 c2 KMD 900MAH and KMD 900MWH auxiliary code R 1 and later Note Pressure Switch MAH Cut out 412 PSIG Cut in 327 21 PSIG 21 0 21 0 MWH Cut out 384 PSIG Cut in 284 21 PSIG...

Страница 42: ...42 Note Pressure Switch Cut out 412 PSIG Cut in 327 21 PSIG 21 0 d1 KMD 900MRH auxiliary code R 0 and earlier...

Страница 43: ...43 d2 KMD 900MRH auxiliary code R 1 and later Note Pressure Switch Cut out 412 PSIG Cut in 327 21 PSIG 21 0...

Страница 44: ...Note 1 The icemaker does not complete a defrost cycle in the first 2 or 3 minutes See II 2 d Controls and Adjustments 2 The bin control will only shut off the ice machine during the first 5 minutes of...

Страница 45: ...drain cycle See II 2 d Controls and Adjustments 2 The icemaker does not complete a defrost cycle in the first 2 or 3 minutes See II 2 d Controls and Adjustments 3 The bin control will only shut off t...

Страница 46: ...0 32 min 100 38 70 21 80 27 90 32 min 100 38 70 21 250 17 6 273 19 2 293 20 6 80 27 268 18 8 304 21 4 316 22 3 90 32 273 19 2 330 23 2 346 24 3 PSIG kg cm2 G 100 38 273 19 2 334 23 5 360 25 3 70 21 45...

Страница 47: ...4 4 WATER FLOW FOR CONDENSER 46 GAL HR AT 100o F 38o C WT 90o F 32o C PRESSURE DROP OF COOLING WATER LINE LESS THAN 10 PSIG TOTAL HEAT OF REJECTION FROM COMPRESSOR 2 020 BTU h AT 90 F 32 C WT 70 F 21...

Страница 48: ...0 PSIG kg cm2 G 100 38 37 2 6 41 2 9 45 3 2 CONDENSER VOLUME 132 CU IN URC 12F TOTAL HEAT OF REJECTION FROM CONDENSER 12 100 BTU h AT 90 F 32 C WT 70 F 21 C TOTAL HEAT OF REJECTION FROM COMPRESSOR 1...

Страница 49: ...9 2 7 80 27 31 2 2 39 2 8 46 3 2 90 32 32 2 3 45 3 2 52 3 6 PSIG kg cm2 G 100 38 33 2 4 47 3 3 58 4 1 2 0 2 0 TOTAL HEAT OF REJECTION FROM CONDENSER 18 865 BTU h AT 90 F 32 C WT 70 F 21 C 3 1 2 0 2 0...

Страница 50: ...50 3 5 WATER FLOW FOR CONDENSER 61 GAL HR AT 100o F 38o C WT 90o F 32o C PRESSURE DROP OF COOLING WATER LINE LESS THAN 10 PSIG 14 15 15 2 4 3 2 2 7 3 0 2 7 2 4 3 0 WATER TEMP F C AMBIENT TEMP F C 50...

Страница 51: ...8 PSIG kg cm2 G 100 38 30 2 1 35 2 5 46 3 2 CONDENSER VOLUME 132 CU IN URC 12F TOTAL HEAT OF REJECTION FROM COMPRESSOR 2 000 BTU h AT 90 F 32 C WT 70 F 21 C 2 0 2 0 TOTAL HEAT OF REJECTION FROM CONDE...

Страница 52: ...Loose connections or open 1 Check for continuity and replace h Thermistor 1 Leads short circuit or open and high temperature safety operates 1 See II 2 d Controls and Adjustments 1 Defrost Control i...

Страница 53: ...g Except water cooled model 5 See chart 1 6 6 Condenser water pressure too low or off Water cooled model only 6 Check and get recommended pressure c Overload Protector 1 Bad contacts 1 Check for conti...

Страница 54: ...oose connection or open and replace 4 Defective capacitor 4 Replace 5 Defective or bound impeller 5 Replace and clean 6 Mechanical seal worn out 6 Check and replace e Controller Board 1 Defective 1 Se...

Страница 55: ...chment 1 See V 11 Removal and Replacement of Thermistor g Controller Board 1 Defrost timer is set too short 1 Adjust longer referring to II 2 d Controls and Adjustments 2 Defrost Timer 2 Defective 2 S...

Страница 56: ...hardness or contains impurities 1 Install a water softener or filter See chart 1 5 and check water supply line water solenoid valve water system pump motor and controller board See chart 2 1 and 2 3...

Страница 57: ...ant practices recover the refrigerant from the access valves and store it in an approved container Do not discharge the refrigerant into the atmosphere b Evacuation and Recharge R 404A 1 Attach chargi...

Страница 58: ...hoses and service manifold 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...

Страница 59: ...same lubricant 1 Turn off the power 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 compres...

Страница 60: ...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...

Страница 61: ...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...

Страница 62: ...aks 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 r...

Страница 63: ...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...

Страница 64: ...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...

Страница 65: ...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...

Страница 66: ...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...

Страница 67: ...k 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 a pressure of 3 4 PSIG when brazing the C P R WARNING A...

Страница 68: ...ard 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 conden...

Страница 69: ...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...

Страница 70: ...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...

Страница 71: ...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...

Страница 72: ...over 4 Lift the bin control assembly out of the icemaker 5 Lift off the insulation then remove the two thumbscrews attaching the bin control to the switch cover 6 Use the thumbscrews to attach the new...

Страница 73: ...position unless the icemaker will be at sub freezing temperatures 1 On water cooled models only first remove the water from the water cooled condenser 1 Remove the front panel 2 Move the control swit...

Страница 74: ...ng compressed air or carbon dioxide 3 Drain the potable water tank 1 Turn off the power supply 2 Move the control switch on the control box to the OFF position 3 Remove the insulation panel by removin...

Страница 75: ...75 Fig 5 Top View Drain Plug Water Shield Overflow Cap Overflow Pipe Cube Guide A Cube Guide B...

Страница 76: ...g valve is used to provide access to the inside of the evaporator during the cleaning and sanitizing operation It should be closed for all icemaking operation The compressor will not operate unless th...

Страница 77: ...the control box to the WASH position 9 Replace water shield overflow pipe overflow cap cube guide A cube guide B and insulation panel in their correct positions Replace the front panel in its correct...

Страница 78: ...insulation panel by removing thumbscrew lifting up the panel slightly and pulling it toward you Remove cube guide B by removing thumbscrew Remove cube guide A Remove overflow cap overflow pipe and wa...

Страница 79: ...e front panel 8 Remove the insulation panel by removing thumbscrew lifting up the panel slightly and pulling it toward you Remove cube guide B by removing thumbscrew Remove cube guide A Remove overflo...

Страница 80: ...the bin dispenser Keep the scoop clean Clean it by using a neutral cleaner and rinse thoroughly Clean the bin dispenser liner by using a neutral cleaner Rinse thoroughly after cleaning 3 Air Filter a...

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