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C. Control Board

• A HOSHIZAKI exclusive solid-state control is employed in the KMS-750MLH Modular

Crescent Cuber.

• All models are pretested and factory-adjusted.

CAUTION

1. Fragile, handle very carefully.
. A control board contains integrated circuits, which are susceptible to failure

due to static discharge. It is especially important to touch the metal part of
the unit when handling or replacing the board.

3. Do not touch 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 for the thermistor, mechanical bin
control and float switch.

5. Always replace the whole board assembly if it goes bad.
6. Do not short out power supply to test for voltage.

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Содержание SRK-7H

Страница 1: ...A Superior Degree of Reliability www hoshizaki com Model KMS 750MLH Including Condensing Unit Model SRK 7H Modular Crescent Cuber Serenity Series Hoshizaki America Inc Number 73152 Issued 8 13 2007 SERVICE MANUAL ...

Страница 2: ...ance and service of the icemaker Should the reader have any questions or concerns which have not been satisfactorily addressed please call write or send an e mail message to the HOSHIZAKI Technical Support Department for assistance HOSHIZAKI AMERICA INC 618 Highway 74 South Peachtree City GA 30269 Attn HOSHIZAKI Technical Support Department Phone 1 800 233 1940 Technical Service 770 487 2331 Fax 1...

Страница 3: ...y Default Dip Switch Settings 16 b Harvest Timer S4 dip switch 1 2 16 c Pump Out Timer S4 dip switch 3 4 17 d Pump Out Frequency Control S4 dip switch 5 6 17 e S4 Dip Switch 7 8 17 f Freeze Timer S4 dip switch 9 10 18 g Float Switch Control S5 dip switch 1 through 5 18 4 Control Board Check Procedure 18 5 Control Board Replacement 19 D Harvest Control Thermistor 19 E Float Switch 20 1 Explanation ...

Страница 4: ... Removal and Replacement of Compressor 36 2 Removal and Replacement of Condenser 37 3 Removal and Replacement of Hot Gas Valve and Liquid Line Valve 37 4 Removal and Replacement of Headmaster Condensing Pressure Regulator C P Regulator 38 5 Removal and Replacement of Fan Motor 39 C Icemaker 39 1 Removal and Replacement of Evaporator 39 2 Removal and Replacement of Expansion Valve 40 3 Removal and ...

Страница 5: ...nnection WATER SUPPLY Inlet 1 2 FPT DRAIN Outlet 3 4 FPT CONDENSATE DRAIN 5 8 OD Pipe 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 Mechanical Level Switch and Timer COMPRESSOR Hermetic Model CS08KQE PFV CONDENSER Air cooled Fin and Tube type EVAP...

Страница 6: ...240 lbs 109 kg CONNECTIONS ELECTRIC Permanent Connection REFRIGERANT Suction line 1 1 8 12 UNF Fitting 11 Parker Liquid line 1 1 16 12 UNF Fitting 10 Parker COMPRESSOR Hermetic Model CS08KQE PFV CONDENSER Air cooled Fin and Tube type COMPRESSOR PROTECTION Auto reset Overload Protector Internal FAN MOTOR PROTECTION Thermal Protection REFRIGERANT CIRCUIT PROTECTION Auto reset High Pressure Control S...

Страница 7: ...s Hot Gas Valve Liquid Line Valve Service Valve High Side Drier Wash Valve Service Valve Low Side Fill Water Valve Control Board Pump Motor Float Switch Drain Water Valve Control Switch Bin Control Switch Service Switch Harvest Water Valve Thermistor Control Box ...

Страница 8: ...enser Headmaster C P Regulator Hot Gas Valve Liquid Line Valve Junction Box Receiver Tank Accumulator Shut off Valve Low Side Compressor Shut off Valve High Side Fan Motor and Fan Blade Access Valve Thermostat Discharge Pipe ...

Страница 9: ... during harvest for a maximum of 6 minutes or the length of harvest minus 50 seconds whichever is shorter LED 4 goes off when HWV closes PM energizes and runs for the last 50 seconds of harvest LED 3 comes on when PM energizes At the end of harvest the control board checks the position of LF S and proceeds to the freeze cycle if it is closed or calls for a 1 minute fill if it is open 3 Freeze Cycl...

Страница 10: ...s the position of LF S and proceeds to the freeze cycle if it is closed or calls for a 1 minute fill if it is open The unit continues to cycle through freeze and harvest cycles until the bin control activates opens and shuts the unit down Note To prevent incomplete batches of ice from forming on the evaporator the control board will only shut down the machine within the first 5 minutes of the free...

Страница 11: ...e Minute Fill Cycle 2 Harvest Cycle 3 Freeze Cycle Pump motor stops for 2 sec and then runs for 10 sec Cycle Steps FWV energized LF S open LF S closed Comp energized FMR energized HGV energized HWV energized FWV de energized DWV de energized Thermistor temp reaches 48 F 9 C 3 9 kΩ or less Harvest timer starts LF S open Comp continues FMR continues PM continues LLV energizes HGV de energized LF S c...

Страница 12: ...ic discharge It is especially important to touch the metal part of the unit when handling or replacing the board 3 Do not touch 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 for the thermistor mechanical bin control and float switch 5 Always replace...

Страница 13: ...lay 3 Liquid Line Valves LLV 4 Pump Motor icemaking 5 Pump Motor harvest 6 Fill Water Valve FWV 7 10 Supply Voltage 8 Open Switch for C board and ALPINE board service boards only Bin Control Switch Open LED yellow S4 Dip Switch Bin Control Switch Closed LED green Alarm Buzzer Power LED red lights when power is supplied to the board LED 2 green Hot Gas Valves HGV LED 3 green Pump Motor PM PM on but...

Страница 14: ...ll signal this problem using 1 beep every 3 seconds The alarm reset button on the control board must be pressed with power on to reset the safety d Low Water Safety The control board checks the position of the lower float switch at the end of the initial one minute water fill cycle and at the end of each harvest cycle If the lower float switch is closed the control board proceeds to the next cycle...

Страница 15: ...uilt in safeties shut down the unit and have alarms as listed below No of Beeps every 3 sec Type of Alarm Notes 1 High Evaporator Temp temperature 127 F 53 C Check for harvest problem stuck HGV or relay hot water entering unit stuck HM or shorted thermistor 2 Harvest Backup Timer harvest 20 min for two cycles in a row Check for open thermistor HGV not opening TXV leaking by low charge or inefficie...

Страница 16: ...ermistor reads 48 F 9 C at the evaporator outlet No adjustment is required under normal use as the harvest timer is adjusted to the suitable position Before changing this setting call the HOSHIZAKI Technical Support Department at 1 800 233 1940 for recommendations Keep in mind that setting the harvest timer to a longer setting will decrease 24 hour production Dip Switch Setting Time seconds No 1 N...

Страница 17: ...ater tank T2 Harvest timer at pump out Depending on the pump out frequency control setting dip switch 5 6 pump out occurs every cycle or every 2nd 5th or 10th cycle d Pump Out Frequency Control S4 dip switch 5 6 The pump motor drains the water tank at the frequency set by the pump out frequency control The pump out frequency control is factory adjusted to drain the water tank every 10 cycles and n...

Страница 18: ...sis 1 Check the S4 and S5 dip switch settings to assure that they are in the factory default positions 2 Turn the control switch to ICE and check for proper control voltage If the red LED is on the control voltage is good If the red LED is off check the control transformer circuit 3 Check the 115 volt input at the wire harness terminals and the 10 pin connector Check the brown and white wire at pi...

Страница 19: ...tart the harvest 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 Temperature C Resistance kΩ 0 18 14 401 10 12 10 613 32 0 6 000 50 10 3 871 70 21 2 474 90 32 1 633 Check a thermistor for resistance by using the following procedure 1 Disconne...

Страница 20: ...h assembly in ice machine cleaner Wipe down the shaft float housing and rubber boot with cleaning solution See VI Cleaning and Maintenance Instructions 3 Float Switch Check Procedure Before replacing a float switch that you suspect is bad make sure the float switch has been cleaned This procedure will help you verify your diagnosis The float switch has three wires The black wire is common The blue...

Страница 21: ...21 Fig 1 Float Switch Red Upper Switch Black Common Blue Lower Switch Lower Switch Float Retainer Clip Housing Mechanical Lock Upper Switch Not used on the KMS 750MLH ...

Страница 22: ... will allow the machine to complete the freeze cycle and the following harvest cycle before shutting down the machine 2 Bin Control Check Procedure 1 Clear any ice away from the bin control 2 Turn the control switch to ICE 3 Check that the green BC CLOSED LED on the control board is on 4 Activate the bin control actuator press the actuator in Check that the yellow BC OPEN LED on the control board ...

Страница 23: ...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 position a DRAIN The KMS series utilizes a pump out drain system When the service switch is active and placed in the DRAIN position power is supplied to the pump and drain valve b CIRC When the service switch is active a...

Страница 24: ...heck Valve Access Valve Hot Gas Valve Strainer Fusible Plug High Pressure Switch Thermostat Discharge Line Compressor Receiver Tank Accumulator Suction Line Hot Gas Valve Strainer OS Quick Check Valve Expansion Valve Float Switch Drain Water Valve Drain Pump Motor Water Tank Fill Water Valve Evaporator Thermistor III Technical Information A Water Circuit and Refrigeration Circuit ...

Страница 25: ...25 B Wiring Diagrams 1 KMS 750MLH SRK 7H Pressure Switch Cut out 412 21 PSIG Cut in 327 21 PSIG 0 Thermostat Switch Cut out 266 F 9 F Cut in 239 F 9 F Transformer Output 10 5V at 115V ...

Страница 26: ... 32 min 100 38 70 21 80 27 90 32 min 100 38 70 21 222 15 6 231 16 2 247 17 4 80 27 229 16 1 243 17 1 261 18 3 90 32 231 16 2 253 17 8 270 19 0 PSIG kg cm 2 G 100 38 235 16 6 257 18 0 286 20 1 70 21 46 3 3 48 3 4 51 3 6 80 27 48 3 3 50 3 5 53 3 7 90 32 48 3 4 51 3 6 54 3 8 PSIG kg cm2 G 100 38 49 3 4 52 3 7 57 4 0 CONDENSER VOLUME SRK 7H UNIT 78 5 CU IN 28 30 31 1637 1635 1651 APPROXIMATE ICE PRODU...

Страница 27: ...ernal filter no water flow If the reservoir fills but the unit fails to start harvest check for open lower float switch see II E 3 Float Switch Check Procedure or bad 1 minute timer in control board See II C 4 Control Board Check Procedure 4 Initial Harvest Cycle LEDs 1 4 and 2 are on The contactor coil energizes to start the compressor and fan motors the hot gas valves energize also energizing th...

Страница 28: ...After the unit switches out of freeze reconnect the black K5 float switch connector to the control board If the unit remains in freeze with the float switch disconnected replace the board To check the float switch see II E 3 Float Switch Check Procedure Note Normal freeze cycle will last 30 to 35 minutes depending on model and conditions Cycle times and pressures should follow performance data pro...

Страница 29: ...onnection 1 Tighten e Fuse Icemaker fused disconnect if any 1 Blown 1 Check for short circuit and correct Reset or replace f Fuse 10A fuse in icemaker 1 Blown 1 Check for short circuit and replace g Control Switch 1 OFF position 1 Move to ICE position 2 Bad contacts 2 Check for continuity and replace 3 Loose connection 3 Tighten h Transformer 1 Open windings 1 Replace i Bin Control 1 Tripped with ...

Страница 30: ... c Wire Harness Terminal Block Condensing Unit and Icemaker 1 Loose connection 1 Tighten d Magnetic Contactor 1 Bad contacts 1 Check for continuity and replace 2 Coil winding opened 2 Replace e Starter 1 Bad contacts 1 Check and replace 2 Coil winding opened 2 Replace f Start Capacitor or Run Capacitor 1 Defective 1 Replace g Overload Protector 1 Bad contacts 1 Check for continuity and replace 2 V...

Страница 31: ...impeller 5 Replace or clean 6 Mechanical seal worn out 6 Check and replace e Control Board 1 Defective 1 See II C 4 Control Board Check Procedure 6 Fan motor will not start or is not operating a Fan Motor 1 Motor winding opened 1 Replace 2 Bearing worn out 2 Replace 3 Wiring to fan motor 3 Check for loose connection or open and replace 4 Defective capacitor 4 Replace 5 Fan blade bound 5 Check and ...

Страница 32: ...Water Temperature 1 Too cool 1 Increase temperature f Liquid Line Valve 1 Continues to open in harvest cycle 1 Check operation in harvest cycle and replace g Thermistor 1 Out of position or loose attachment 1 See V C 6 Removal and Replacement of Thermistor h Control Board 1 Defective 1 See II C 4 Control Board Check Procedure 3 Other a Spray Tubes 1 Clogged 1 Clean 2 Out of position 2 Place in pos...

Страница 33: ...Cube Guide or Ice Separator 1 Out of position Circulated water falls into bin 1 Place in position b See chart 1 5 and check water supply line water valves water system pump motor and control board c Drain Water Valve 1 Leaking 1 Check and replace 2 Cloudy or irregular cubes a See chart 2 1 and 2 3 and check float switch water valves control board spray tubes water system refrigerant charge and exp...

Страница 34: ... recharge of the system always use the access valve on the receiver tank for the high side and either the shutoff valve of the condensing unit or the service valve of the icemaker unit for the low side line 1 Refrigerant Recovery Using proper refrigerant practices recover the refrigerant and store it in an approved container Do not discharge the refrigerant into the atmosphere 2 Brazing WARNING 1 ...

Страница 35: ...ts 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 Never allow the oil in the vacuum pump to flow backwards 3 Allow the vacuum pump to pull down to a 29 9 Hg vacuum Evacuating period depends on pump capacity 4 Close the low side valve and high side valve on the service manifold 5 Disconnect the...

Страница 36: ...nal cover on the compressor and disconnect the compressor wiring 5 Remove the hold down bolts washers and rubber grommets 6 Remove the crankcase heater discharge and suction pipes 7 Remove the compressor Unpack the new compressor package 8 Attach the rubber grommets of the prior compressor 9 Place the compressor in position and secure it using the bolts and washers 10 Attach the crankcase heater t...

Страница 37: ...as 140 PSIG and soap bubbles 10 Evacuate the system and charge it with refrigerant See the nameplate on the condensing unit for the required refrigerant charge 11 Replace the panels in their correct positions 12 Turn on the power supply 3 Removal and Replacement of Hot Gas Valve and Liquid Line Valve CAUTION 1 The condensing unit has 1 hot gas valve and 1 liquid line valve Both valves have a strai...

Страница 38: ...econnect using closed end connectors 12 Connect the new solenoid leads 13 Attach the solenoid to the valve body and secure it with a screw 14 Replace the panels in their correct positions 15 Turn on the power supply 4 Removal and Replacement of Headmaster Condensing Pressure Regulator C P Regulator IMPORTANT Always install a new drier every time the sealed refrigeration system is opened Do not rep...

Страница 39: ...n motor bracket and fan motor 5 Install the new fan motor and replace the removed parts in the reverse order of which they were removed 6 Replace the panels in their correct positions 7 Turn on the power supply C Icemaker IMPORTANT Always install a new drier every time the sealed refrigeration system is opened Do not replace the drier until after all other repair or replacement has been made Insta...

Страница 40: ...e panels in their correct positions 14 Turn on the power supply 2 Removal and Replacement of Expansion Valve IMPORTANT 1 Sometimes moisture in the refrigerant circuit exceeds the drier capacity and freezes up at the expansion valve Always install a new drier every time the sealed refrigeration system is opened Install the new drier with the arrow on the drier in the direction of the refrigerant fl...

Страница 41: ... CAUTION 1 The icemaker unit has 1 hot gas valve and 1 liquid line valve The hot gas valve has a strainer prior to the valve body It is advisable to change the strainer and check valves when replacing the hot gas valve 2 Always use a copper tube of the same diameter and length when replacing the hot gas and liquid lines otherwise performance may be reduced 3 Always install a new drier every time t...

Страница 42: ...e panels 3 Drain the water tank by removing the insulation panel front frame and suction hose See Fig 3 4 Disconnect the pump suction and discharge hoses 5 Unplug the water pump connector 6 Remove the screws and pump motor bracket 7 Remove the pump housing and check the impeller 8 If the impeller is defective install a new impeller 9 Install the new motor or new parts and replace the removed parts...

Страница 43: ... 4 Disconnect the thermistor leads from the K3 connector on the control board 5 Remove the plastic cable ties foam insulation thermistor holder and thermistor 6 Scrape away the old sealant on the thermistor holder and the suction pipe 7 Wipe off moisture or condensation on the suction pipe 8 Smoothly apply recommended sealant KE4560RTV Part Code 60Y000 11 or 4A0683 01 to the thermistor holder conc...

Страница 44: ...pply and turn it on after 3 minutes The defrost cycle starts and the cubes will be removed from the evaporator 3 Turn off the power supply Remove the front panel 4 Place the control switch in the SERVICE position Then place the service switch in the DRAIN position 5 Replace the front panel and turn on the power supply for 2 minutes 6 Turn off the power supply 7 Remove the front panel 8 In bad or s...

Страница 45: ...eplace the front panel in its correct position 19 Turn on the power supply to fill the water tank with water 20 Turn off the power supply after 3 minutes 21 Remove the front panel 22 Move the control switch to the SERVICE position then move the service switch to the WASH position 23 Replace the front panel in its correct position 24 Turn on the power supply to rinse off the cleaning solution 25 Tu...

Страница 46: ... switch to the ICE position 14 Replace the front panel in its correct position 15 Clean the dispenser or storage bin with water 16 Turn on the power supply and start the automatic icemaking process B Maintenance IMPORTANT This icemaker must be maintained individually referring to the instruction manual and labels provided with the icemaker 1 Stainless Steel Exterior To prevent corrosion wipe the e...

Страница 47: ... switch is closed and calling for ice The green BC CLOSED LED on the control board should be on 6 Once LED 1 and 2 on the control board energize the order of the LEDs from the outer edge of the control board is 1 4 3 2 close the potable water supply line shut off valve and open the potable water supply line drain valve Allow the line to drain by gravity 7 Disconnect the harvest water valve hose in...

Страница 48: ...ontrol switch to the OFF position 19 Reconnect the thermistor to the K3 connector on the control board Reconnect the water pump connector 20 Close the potable water supply line drain valve 21 Remove all ice from the dispenser or storage bin and clean the bin 22 Turn off the power supply 23 Replace all removed parts and panels in their correct positions Harvest Water Valve Hose Harvest Water Valve ...

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