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5. Control Board Replacement

The dip switches should be adjusted to the factory default settings as outlined in this
manual. S4 dip switch #8 must remain off.

D. Harvest Control – Thermistor

A thermistor (semiconductor) is used for a harvest control sensor. The resistance varies
depending on the suction line temperatures. The thermistor detects the temperature of
the evaporator outlet to start 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

-1

10.614

3

0

6.000

50

10

3.871

70

1

.474

90

3

1.633

Check a thermistor for resistance by using the following procedure:

1) Disconnect the connector K3 on the board.
) Remove the thermistor. See "V.C.6. Removal and Replacement of Thermistor."
3) Immerse the thermistor sensor portion in a glass containing ice and water for or 3

minutes.

4) 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.

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Содержание SRK-14H

Страница 1: ...Superior Degree of Reliability www hoshizaki com Model KMS 1400MLH Including Condensing Unit Model SRK 14H 3 Modular Crescent Cuber Serenity Series Hoshizaki America Inc Number 73162 Issued 2 28 2008 SERVICE MANUAL ...

Страница 2: ...r Should the reader have any questions or concerns which have not been satisfactorily addressed please call write or send an e mail message to the HOSHIZAKI Technical Support Department for assistance HOSHIZAKI AMERICA INC 618 Highway 74 South Peachtree City GA 30269 Attn HOSHIZAKI Technical Support Department Phone 1 800 233 1940 Technical Service 770 487 2331 Fax 1 800 843 1056 770 487 3360 E ma...

Страница 3: ...arm Safeties 18 3 Controls and Adjustments 19 a Default Dip Switch Settings 19 b Harvest Timer S4 dip switch 1 2 19 c Pump Out Timer S4 dip switch 3 4 20 d Pump Out Frequency Control S4 dip switch 5 6 20 e Factory Use S4 Dip Switch 7 8 20 f Freeze Timer S4 dip switch 9 10 21 g Float Switch Control and Refill Counter S5 dip switch 1 through 5 21 4 Control Board Check Procedure 21 5 Control Board Re...

Страница 4: ...36 2 Evaporator is Frozen Up 39 3 Low Ice Production 40 4 Abnormal Ice 40 5 Other 40 V Removal and Replacement of Components 41 A Service for Refrigerant Lines 41 1 Refrigerant Recovery 41 2 Brazing 42 3 Evacuation and Recharge R 404A 42 B Condensing Unit 43 1 Removal and Replacement of Compressor 43 2 Removal and Replacement of Condenser 44 3 Removal and Replacement of Hot Gas Valve and Liquid Li...

Страница 5: ...eaning and Maintenance 52 A Cleaning and Sanitizing Instructions 52 1 Cleaning Procedure 52 2 Sanitizing Procedure Following Cleaning Procedure 54 B Maintenance 54 C Preparing the Icemaker for Long Storage 55 ...

Страница 6: ...ng 177 lbs 80kg SRK 14H Net 230 lbs 104kg Shipping 273 lbs 124kg CONNECTIONS ELECTRIC Permanent Connection 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 ...

Страница 7: ... 2 KMS 1400MLH SRK 14H3 Intentionally Left Blank Note We reserve the right to make changes in specifications and design without prior notice ...

Страница 8: ...273 lbs 124 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 CS18K6E 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 9: ... 2 SRK 14H3 Intentionally Left Blank Note We reserve the right to make changes in specifications and design without prior notice ...

Страница 10: ...es 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 11: ...ndenser Headmaster C P Regulator Hot Gas Valve Liquid Line Valve Junction Box Receiver Tank Accumulator Shut off Valve Low Side Thermostat Discharge Pipe Compressor Shut off Valve High Side Fan Motor and Fan Blade Control Box ...

Страница 12: ...cycle is 2 minutes HWV is open 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 fi...

Страница 13: ...trol 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 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 min...

Страница 14: ... 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 FWV energized de energized for refill only HGV de energized LF S closed Freeze cycle operation t...

Страница 15: ...tic 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 replac...

Страница 16: ...lves HGV Water Valve Relay 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 ...

Страница 17: ...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 18: ...V DWV 10 seconds 20 seconds pump out timer setting The built 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 thermisto...

Страница 19: ...hen the thermistor 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 contact Hoshizaki Technical Support 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 No ...

Страница 20: ...mer 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 no adjustment is require...

Страница 21: ...lp you verify your diagnosis 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 b...

Страница 22: ...ance 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 10 614 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 Disconnect the connector K3 on the board 2 Remove the thermistor See V C 6 Removal and...

Страница 23: ... 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 wire is for the lower float switch contact and the red wire is for the upper float switch contact 1 Disco...

Страница 24: ...24 Fig 1 Float Switch Red Upper Switch Black Common Blue Lower Switch Upper Switch Lower Switch Float Retainer Clip Housing Mechanical Lock ...

Страница 25: ... 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 26: ...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 27: ... Check 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 28: ...28 B Wiring Diagrams 1 KMS 1400MLH SRK 14H 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 29: ...29 2 KMS 1400MLH SRK 14H3 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 30: ...Harness Connections BR V P BK W BR GN GND V P BK W GN BR V P BK W GN BR V P BK W GND Legend GND ground HGV hot gas valve CB control board LLV liquid line valve L2 single phase power supply L3 three phase power supply Wire Color Code BK black BR brown GN green P pink V violet W white KMS Icemaker Unit factory connected ...

Страница 31: ...70 21 186 13 1 204 14 3 224 15 7 80 27 200 14 0 228 16 0 245 17 2 90 32 204 14 3 247 17 4 266 18 7 PSIG kg cm 2 G 100 38 206 14 5 252 17 7 283 19 9 70 21 39 2 7 40 2 8 41 2 9 80 27 39 2 8 41 2 9 42 3 0 90 32 40 2 8 42 2 9 43 3 0 PSIG kg cm 2 G 100 38 40 2 8 42 3 0 45 3 1 CONDENSER VOLUME SRK 14H UNIT 226 CU IN Note Pressure data is recorded at 5 minutes into freezing cycle The data not in bold sho...

Страница 32: ...entionally Left Blank Note 1 Pressure data is recorded at 5 minutes into freezing cycle The data not in bold should be used for reference only 2 We reserve the right to make changes in specifications and design without prior notice ...

Страница 33: ...ernal filter no water flow If the reservoir fills but the unit fails to start harvest check for open lower float switch see II F 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 34: ...on the second activation of the lower float switch and after 5 minutes of freeze Diagnosis Minimum freeze time is 5 minutes During the first 5 minutes of freeze confirm that the evaporator temperature drops compressor fan motors pump motor and liquid line valves are energized and that the hot gas valves harvest water valve and fill water valve except during refill are de energized and not bypassin...

Страница 35: ...ves contaminants from the water reservoir through the drain water valve and allows for a power flush of the float switch Diagnosis If the pump motor does not come on check the circuit and capacitor If water does not pump out remove the drain water valve housing and check clean the valve assembly check for voltage on the drain valve coil with LED 3 on make sure that the drain line is not clogged 7 ...

Страница 36: ...nd replace drier d Thermostat Condensing Unit High Temperature Safety 1 Open contacts 1 Let cool and reset Check for continuity and replace if open e Wire Harness Terminal Block Condensing Unit and Icemaker 1 Loose connection 1 Tighten f Fuse Icemaker fused disconnect if any 1 Blown 1 Check for short circuit and correct Reset or replace g Fuse 10A fuse in icemaker 1 Blown 1 Check for short circuit...

Страница 37: ...ot start or stops operating a Control Switch 1 SERVICE position 1 Move to ICE position 2 Bad contacts 2 Check and replace b Control Board 1 Defective 1 See II C 4 Control Board Check Procedure 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 ...

Страница 38: ...Check for loose connection or open and replace 4 Defective capacitor 4 Replace 5 Defective or bound 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...

Страница 39: ...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 40: ...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 41: ... 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 IMPORTANT 1 The condensing unit is provided with two shutoff valves one on the low side one on the high side and also with an access valve on the receiver tank The icemaker unit is provi...

Страница 42: ...as 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 3 Use an electronic leak detector or soap b...

Страница 43: ...rier 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 Note When replacing a compressor with a defective winding be sure to install the new start capacitor and start relay supplied with the replacement compressor Due to the...

Страница 44: ...placement has been made Install the new drier with the arrow on the drier in the direction of the refrigerant flow 1 Turn off the power supply 2 Remove the panels 3 Recover the refrigerant and store it in an approved container 4 Disconnect the condenser refrigerant tubing 5 Remove the condenser 6 Place the new condenser in position and secure with the mounting screws 7 Remove the drier then place ...

Страница 45: ...trainer in position 7 Remove the drier then place the new drier in position located in the icemaker Install the new drier with the arrow on the drier in the direction of the refrigerant flow 8 Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG CAUTION Always protect the valve body by using a damp cloth to prevent the valve from overheating Do not braze with the...

Страница 46: ...ings with nitrogen gas flowing at a pressure of 3 to 4 PSIG CAUTION Always protect the headmaster body by using a damp cloth to prevent it from overheating Do not braze with the headmaster body exceeding 250 F 121 C 9 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 nit...

Страница 47: ...e it in an approved container 4 Remove the spray tubes and the insulation at the U shaped notch where the refrigeration tubing passes through the molded chassis 5 Disconnect the evaporator tubing 6 Remove the pop rivets securing the evaporator then lift out the evaporator 7 Install the new evaporator 8 Remove the drier then place the new drier in position Install the new drier with the arrow on th...

Страница 48: ...ier in the direction of the refrigerant flow 7 Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG WARNING 1 Do not heat the wall of the machine Place a steel barrier for protection 2 Always protect the valve body by using a damp cloth to prevent the valve from overheating Do not braze with the valve body exceeding 250 F 121 C 8 Use an electronic leak detector o...

Страница 49: ... new valve strainer and check valve in position 7 Remove the drier then place the new drier in position Install the new drier with the arrow on the drier in the direction of the refrigerant flow 8 Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG CAUTION Always protect the valve body by using a damp cloth to prevent the valve from overheating Do not braze with...

Страница 50: ... for leaks 11 Replace the panels in their correct positions 5 Removal and Replacement of Fill and Harvest Water Valve 1 Turn off the power supply 2 Close the water supply line shut off valve 3 Open the water supply line drain valve and let the water supply line drain 4 Remove the panels 5 Remove the valve outlet tubing and fitting nut 6 Disconnect the terminals from the water valve 7 Remove the br...

Страница 51: ...ape 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 concave 9 Attach the new thermistor to the suction pipe in the same position as the previous thermistor Be very careful to prevent damage to the leads Secure it using t...

Страница 52: ...arm water 2 Remove all ice from the evaporator and the dispenser unit storage bin Note To remove cubes on the evaporator turn off the power supply and turn it on after 3 minutes The harvest 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 po...

Страница 53: ...the power supply and remove the front panel 17 Move the control switch to the ICE position 18 Replace 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 pan...

Страница 54: ...e ICE position 14 Replace the front panel in its correct position 15 Clean the dispenser unit storage bin liner using a neutral cleaner Rinse thoroughly after cleaning 16 Turn on the power supply to 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 E...

Страница 55: ...ol switch to the ICE position Confirm that the bin control 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 inlet water supply line shut off valve and open the inlet water supply line drain valve Allow the line to drain b...

Страница 56: ...e OFF position 19 Reconnect the thermistor to the K3 connector on the control board Reconnect the water pump connector 20 Close the inlet water supply line drain valve 21 Remove all ice from the dispenser unit storage bin and clean the dispenser unit storage bin liner using a neutral cleaner Rinse thoroughly after cleaning 22 Turn off the power supply 23 Replace all removed parts and panels in the...

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