KM-250B_F Service Manual
Contents
1. Bad contacts or leaks in bulb Check for continuity and replace e High Pressure Control Bad contacts Check for continuity and replace f Transformer Thermal fuse blown out 1 or coil winding opened Replace g Wiring to Controller Board Loose connections or open Check for continuity and replace h Thermistor Leads short circuit or open and high temperature safety operates If open unit will start but have long harvest See 11 2 d Controls and Adjustments 1 Defrost Control i Hot Gas Solenoid Valve Continues to open in freeze cycle and high temperature safety operates Check for power off in freeze cycle and replace j Water Supply Line Water supply off and water supply cycle does not finish Check and get recommended pressure Condenser water pressure too low or off and pressure control opens and closes fre quently to finally operate high temperature safety Check and get recommended pressure k Water Solenoid Mesh filter or orifice gets clogged and water supply cycle does not finish Clean 2 Coil winding opened Replace 3 Wiring to water valve Check for loose connection or open and replace PROBLEM POSSIBLE CAUSE REMEDY 1 Controller Board 2 Water continues to be supplied and the ice a Float Switch Defective Conne2. Wiring to compressor Check for loose connection or open and replace Defective Replace Protector tripped Reduce temperature h Controller board 4 Water a Water Solenoid continues to Valve Defective Diaphragm does not close See 11 2 e Checking the Controller Board Check for water leaks with icemaker off be supplied in b Controller Board freeze cycle Defective 28 See 11 2 e Checking the Controller Board PROBLEM EE CAUSE REMEDY 5 No water a Water Supply Line 1 Water pressure too low and 1 Check and get comes from spray tubes water level in water tank too low recommended pressure water pump will not start or freeze cycle b Water Solenoid Valve Dirty mesh filter or orifice and water level in water tank too low Clean time is too short c Water System Water leaks Check connections for water leaks and replace Clogged Clean d Pump Motor Motor winding opened Replace Bearing worn out Replace 2 1 2 3 Wiring to pump motor Check for loose connection or open and replace Defective capacitor Replace Defective or bound impeller Replace and clean e Controller Board 6 Fan motor will not start or is not operating a Fan Motor Defective Motor winding opene
3. Check and get recommended pressure c Water Solenoid Valve Dirty mesh filter or orifice Clean Diaphragm does not close Check for water leaks with icemaker off d Ambient and or water temperature Too cool Increase temperature e Thermistor Out of position or loose attachment See V 10 Removal and Replacement of Thermistor f Controller Board a Spray Tubes Defrost timer is set too short Adjust longer referring to Il 2 d Controls and Adjustments 2 Defrost Timer Defective Clogged See II 2 E uds the Out of position Place in position b Water System Dirty Clean c Refrigerant Undercharged Check for leaks and recharge d Expansion Valve Bulb out of position or loose attachment Place in position Defective Replace e Hot Gas Solenoid Valve Coil winding opened Replace Plunger does not move Replace Wiring to hot gas valve Check for loose connection or open and replace f Water Supply Line Too small requires 3 8 OD line dedicated per machine Increase water supply line size 9 Water Filter 1 Flow rate too small 30 Replace with filter with larger flow rate 3 Low Ice Production PROBLEM POSSIBLE CAUSE REMEDY 1 Freeze cycle a See chart 1
4. 7 Install the new drier 8 Check for leaks using nitrogen gas 140 PSIG and soap bubbles 9 Evacuate the system and charge it with refrigerant See the nameplate for the required refrigerant charge 10 Cut the leads of the solenoid allowing enough lead length to reconnect using closed end connectors 11 Connect the new solenoid leads 12 Attach the solenoid to the valve body and secure it with a screw 13 Replace the panels in their correct positions 14 Plug in the icemaker and turn on the power supply 37 7 Removal and Replacement of Evaporator IMPORTANT Always install a new drier every time the sealed refrigeration system is opened Do not replace the drier until after all other repairs or replacements have been made 1 Turn off the power supply and unplug the icemaker 2 Remove the panels and the top insulation over the evaporator 3 Recover the refrigerant and store it in an approved container 4 Remove the spray tubes and the insulations at the U shaped notch where the refrigeration tubings go through the molded chassis 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 evaporator 8 Install the new drier 9 Check for leaks using nitrogen gas 140 PSIG and soap bubbles 10 Evacuate the system and charge it with refrigerant See the n
5. HOSHIZAKI CRESCENT CUBER MODEL KM 250BAF KM 250BWF SERVICE MANUAL IMPORTANT Only qualified service technicians should attempt to service or maintain this icemaker No such service or maintenance should be undertaken until the technician has thoroughly read this Service Manual HOSHIZAKI provides this manual primarily to assist qualified service technicians in the service and maintenance of the icemaker Should the reader have any questions or concerns which have not been satisfactorily addressed please call or write 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 770 487 3360 NOTE To expedite assistance all correspondence communication MUST include the following information Model Number e Serial Number Complete and detailed explanation of the problem Please review this manual It should be read carefully before the icemaker is serviced or maintenance operations performed Only qualified service technicians should service and maintain the icemaker This manual should be made available to the technician prior to service or maintenance CONTENTS IS POCINCANONS caca EEN INE EE E A Is GSMS Fall ROU AMON dai e ET Mi SOU SURICUOM pM M x cr Ia NZ SORA tintin dia ient mcm duae cena ir
6. kg cm G 100 38 50 3 5 TOTAL HEAT OF REJECTION FROM CONDENSER 5707 BTU h AT 90 F 32 C WT 70 F 21 C TOTAL HEAT OF REJECTION FROM COMPRESSOR 1038 BTU h AT 90 F 32 C WT 70 F 21 C WATER FLOW FOR CONDENSER 23 8 gal h AT 100 F 38 C WT 90 F 32 C PRESSURE DROP OF COOLING WATER LINE less than 10 PSIG Note Pressure data is recorded at 5 minutes into freezing cycle The data not in bold should be used for reference only We reserve the right to make changes in specifications and design without prior notice 26 IV Service Diagnosis 1 No Ice Production PROBLEM POSSIBLE CAUSE REMEDY 1 The icemaker will not start a Power Supply OFF position 1 Move to ON position Loose connections 2 Tighten Bad contacts 3 Check for continuity and replace Voltage too high 4 Check and get recommended voltage b Fuse Inside Fused Disconnect if any Blown out 1 Check for short circuit and replace c Control Switch OFF position Move to ICE position Bad contacts 2 Check for continuity and replace d Bin Control Thermostat Tripped with bin filled with ice Remove ice Ambient temperature too cool Increase ambient temperature Set too warm See 11 2 d Controls and Adjustments 6 Bin Control Bulb out of position Place in position
7. 3 Remove the control box cover 4 Disconnect the thermistor leads from the K3 connector on the controller board Foam Insulation Thermistor Holder 5 Remove the plastic cable ties foam insulation thermistor holder and Fig 2 thermistor See Fig 2 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 to the thermistor holder concave 9 Attach the new thermistor to the suction pipe very carefully to prevent damage to the leads And secure it using the thermistor holder and recommended foam insulation 10 Secure the insulation using the plastic cable ties 11 Connect the thermistor leads through the bushing of the control box to the K3 connector on the controller board Note Do not cut the leads of the thermistor while installing it 41 12 Replace the control box cover and the panels in their correct positions 13 Plug in the icemaker and turn on the power supply 11 Removal and Replacement of Fan Motor Except Water Cooled Model Note When replacing a fan motor with defective winding it is recommended that a new capacitor be installed 1 Turn off the power supply and unplug the icemaker 2 Remove the top front and left side panels 3 Remove the screws and the fan shroud 4 Remove the fan blade 5 Remove the closed end connectors of the f
8. 5 After the first 5 minutes in freeze cycle 4 Defrost timer stops counting Ready to complete freeze cycle when float Defrost cycle is completed and freeze cycle switch circuit opens starts IMPORTANT Board never accepts freeze completion signal within the first 5 minutes in freeze cycle IMPORTANT 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 13 2nd Cycle and after with pump drain IMPORTANT Freeze cycle time is limited to 60 minutes even if float switch does not open Float switch opens and signals to complete 2 Drain timer stops counting freeze cycle Pump drain is completed Drain timer starts counting DRAIN VALVE DEFROST S d X E E S 3 Thermistor reads 48 F Defrost timer starts counting IMPORTANT Water valve opening is limited to 6 minutes 4 Defrost timer stops counting Defrost cycle is completed and freeze cycle starts 5 After the first 5 minutes in freeze cycle Ready to complete freeze cycle when float Switch circuit opens IMPORTANT Board never accepts freeze completion signal within the first 5 minutes in freeze cycle IMPORTANT 1 Board never accepts defrost completion signal within the first 2 minutes in defrost cycle 2 Defrost cycle time is limited to 20 min
9. 3 and check dirty air filter or condenser ambient or water time is long temperature water pressure or refrigerant charge b See chart 2 1 and check float switch water solenoid valve or controller board 2 Harvest cycle a See chart 2 2 and check controller board thermistor evaporator ambient time is long and or water temperature water supply line or water solenoid valve 4 Abnormal Ice PROBLEM POSSIBLE CAUSE REMEDY 1 Small Cube a Ice Cube Guide 1 Out of position 1 Place in position Circulated water falls into bin b See chart 1 5 and check water supply line water solenoid valve water system pump motor or controller board 2 Cloudy or a See chart 2 1 and 8 and check float switch water solenoid valve irregular cube controller board spray tubes water system refrigerant charge or expansion valve b Spray Guide 1 Dirty 1 Clean c Water Quality 1 High hardness or contains 1 Install a water filter or impurities softener 5 Other PROBLEM POSSIBLE CAUSE REMEDY 1 Icemaker will a Bin Control 1 Set too cold Adjust warmer not stop when Thermostat 2 Defective 2 Replace bin is filled with ice 2 Abnormal a Pump Motor Bearings worn out Replace noise b Fan Motor Bearings worn out Replace Fan blade deformed Replace fan blade Fan blade does not move Replace freely c Compressor Bearings worn out or Replace cylinder
10. CHARGE DESIGN PRESSURE P C BOARD CIRCUIT PROTECTION COMPRESSOR PROTECTION REFRIGERANT CIRCUIT PROTECTION LOW WATER PROTECTION ACCESSORIES SUPPLIED OPERATING CONDITIONS 100 Ibs 90 70 F 70 50 F 894 13 875 8 9 57 30 3 104 3 44 2 25 x 28 x 39 635 x 711 x990 mm Including 6 legs P V C coated galvanized steel Polyethylene Galvanized Steel Rear Stainless steel Top Net 165 lbs 75 kg Shipping 192 Ibs 87 kg Cord Connection Inlet 3 8 Flare Outlet 3 4 FPT Float Switch Hot Gas and Water Thermistor and Timer Timer Controlled Overflow Pipe N A Thermostat Hermetic Model RS43C1E CAA 219 Air cooled Fin and tube type Vertical type Stainless Steel and Copper Thermostatic Expansion Valve R 404A 120z 340g High 467 PSIG Low 230 PSIG High Voltage Cut out Internal Auto reset Overload Protector Internal Auto reset High Pressure Control Switch Float Switch ice Scoop 6 Leg 4 pcs VOLTAGE RANGE 104 127 V AMBIENT TEMP 45 100 F WATER SUPPLY TEMP 45 90 F WATER SUPPLY PRESSURE 10 113 PSIG We reserve the right to make changes in specifications and design without prior notice 2 KM 250BWF AC SUPPLY VOLTAGE 115 60 1 AMPERAGE 9 5 A 5 Min Freeze AT 104 F WT 80 F APPROXIMATE ICE PRODUCTION Ambient WATER TEMP F PER 24 HR TempCF 50 70 90 Ibs day kg day 70 222 101 205 93 208 94 80 Reference without marks SHA
11. 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 Always recover the refrigerant and store it in an approved container Do not discharge the refrigerant into the atmosphere Do not use silver alloy or copper alloy containing arsenic Do not use R 404A as a mixture with pressurized air for leak testing Refrigerant leaks can be detected by charging the unit with a little refrigerant raising the pressure with nitrogen and using an electronic leak detector Note All brazing connections inside the bin are clear paint coated Sandpaper the brazing connections before unbrazing the components Use a good abrasive cloth to remove coating 33 3 Removal and Replacement of Compressor 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 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 ability of the POE oil in the compressor to absorb moisture quickly the compressor must not be opened more than 15 minutes for replacement or service Do not mix lubricants of different compressors even if both are charged with R 404A except when they use the same lubricant 1 Turn
12. position 5 Allow 5 minutes for the icemaker to fill with water and the water pump to start opening 6 Close the water cooled condenser water supply line shut off valve 7 Open the drain valve for the water cooled condenser water supply line 8 Allow the line to drain by gravity 9 Attach compressed air or carbon dioxide supply to the condenser water line drain valve 10 Quickly blow the water cooled condenser out using compressed air or carbon dioxide until water stops coming out 45 2 Remove the water from the potable water supply line 1 Remove the front panel Except water cooled model 2 Move the control switch on the control box to the OFF position 3 Wait 3 minutes 4 Close the potable water supply line shut off valve and open the potable water supply line drain valve 5 Allow the line to drain by gravity 6 Attach compressed air or carbon dioxide 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 tank 1 Disconnect the power supply 2 Move the control switch to the OFF position ee EE 3 Open the door T 4 Remove the plug at the bottom of the water tank to drain the water tank See Fig 3 Plug Oy 5 Replace the plug in its correct position 6 Remove all ice from the storage bin and clean the Fig 3 storage bin 7 Shut
13. water regulating valve also called water regulator is factory adjusted No adjustment is required under normal use Adjust the water regulator if necessary using the following procedures 1 Attach a pressure gauge to the high side line of the 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 thermometer reads 104 115 F 5 minutes after a freeze cycle or icemaking process starts When the pressure exceeds 270 PSIG or the condenser drain temperature exceeds 115 F rotate the adjustment screw counter clockwise See Fig 1 3 Check that the pressure or the condenser drain temperature holds a stable setting ADJUSTMENT SCREW CW Higher CCW Lower e OQ 9 Top View Fig 1 40 10 Removal and Replacement of Thermistor CAUTION Fragile handle very carefully Always use a recommended sealant high thermal conductive type Model KE4560RTV manufactured by Shinetsu Silicone Part Code 60Y000 11 or Part Code 4A0683 01 or equivalent Always use a recommended foam insulation non absorbent type or equivalent Do not shorten or cut the thermistor leads when installing the thermistor 1 Turn off the power supply and unplug the Thermistor Lead Cable Tie icemaker 7 7224 M ZZ ZZ Wa irn HL NI ALZA OA E 2 Remove the panels
14. N PER 24 HR CFPC 50 10 70 21 90 32 70 21 222 1 80 27 204 90 32 189 lbs day _kg day 100 38 183 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 jday m day 100 38 FREEZING CYCLE TIME 70 21 80 27 90 32 min 100 38 HARVEST CYCLE TIME 70 21 80 27 90 32 min 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 ka cm G 100 38 TOTAL HEAT OF REJECTION FROM CONDENSER 5064 BTU h E21 90 F 32 C WT 70 F 21 C Note Pressure data is recorded at 5 minutes into freezing cycle The data not in bold should be used for reference only We reserve the right to make changes in specifications and design without prior notice 25 b KM 250BWF APPROXIMATE ICE AMBIENT TEMP WATER TEMP F C PROBUCTION HEISE TO CERO 70 21 222 101 6 80 27 214 90 32 211 lbs day kg day 100 38 210 APPROXIMATE ELECTRIC 70 21 805 793 795 CONSUMPTION 80 27 796 776 790 90 32 793 763 712 watts 100 38 APPROXIMATE WATER 70 21 CONSUMPTION PER 24 HR 80 27 90 32 100 38 70 21 80 27 90 32 100 38 70 21 80 27 90 32 gal day m day FREEZING CYCLE TIME min HARVEST CYCLE TIME min 100 38 HEAD PRESSURE 70 21 270 19 0 80 27 275 19 3 90 32 283 19 9 PSIG kg cm G 100 38 285 20 0 SUCTION PRESSURE 70 21 48 3 4 80 27 49 3 4 90 32 49 3 4 PSIG
15. PE OF ICE Crescent Cube ICE PRODUCTION PER CYCLE 3 98lbs 1 8 kg 200 pcs APPROXIMATE STORAGE CAPACITY N A ELECTRIC 8 WATER CONSUMPTION 90 70 F 70 50 F ELECTRIC W KWH 100 lbs 763 9 9 805 8 7 WATER gal 24HR gal 100 lbs 80 5 43 5 109 49 WATER COOLED CONDENSER 342 185 212 95 4 al 24HR gal 100 Ibs EXTERIOR DIMENSIONS WxDxH 25 x 28 x 39 635 x 711 x 990 mm Including 6 legs EXTERIOR FINISH P V C coated galvanized steel Polyethylene Galvanized Steel Rear Stainless steel Top WEIGHT Net 165 lbs 75 kg Shipping 192 Ibs 87 kg CONNECTIONS ELECTRIC Cord Connection WATER SUPPLY Inlet 3 8 Flare Condenser Inlet 1 2 FPT DRAIN Outlet 3 4 FPT Condenser Outlet 1 2 FPT 3 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 Pressure Regulator BIN CONTROL SYSTEM Thermostat COMPRESSOR Hermetic Model RS43C1E CAA 219 CONDENSER Water cooled Tube in tube type EVAPORATOR Vertical type Stainless Steel and Copper REFRIGERANT CONTROL Thermostatic Expansion Valve REFRIGERANT CHARGE R 404A 10 60z 300g DESIGN PRESSURE High 427 PSIG Low 230 PSIG P C BOARD CIRCUIT PROTECTION High Voltage Cut out Internal COMPRESSOR PROTECTION Auto reset Overload Protector Internal REFRIGERANT CIRCUIT PROTECTION Auto reset High Pressure Control Switch LOW WATER PROTECTION Float Switch ACCE
16. SSORIES SUPPLIED Ice Scoop 6 Leg 4 pcs OPERATING CONDITIONS VOLTAGE RANGE 104 127 V AMBIENT TEMP 45 100 F WATER SUPPLY TEMP 45 90 F WATER SUPPLY PRESSURE 10 113 PSIG We reserve the right to make changes in specifications and design without prior notice ll General Information 1 Construction a KM 250BAF Spray Tube Evaporator A Condenser Condenser Fan Motor Hot Gas Valve Strainer Pressure Switch Drier Expansion Valve Access Valve Compressor Cleaning Water Valve Water Valve 4 Float Switch Pump Motor Control Box Control Switch Bin Control Thermostat b KM 250BWF Water Regulator Spray Tube Evaporator we Hot Gas Valve Water cooled Pressure Condenser Switch Access Valve Strainer Drier Expansion Valve Compressor Cleaning Water Valve Water Valve Float Switch Pump Motor Control Box Control Switch Bin Control Thermostat 2 Controller Board a Solid State Control 1 AHOSHIZAKI exclusive solid state control is employed in KM 250BAF and KM 250BWF Crescent Cubers 2 A printed circuit board hereafter called controller board includes a stable and high quality control system 3 All models are pretested and factory adjusted b Controller Board CAUTION Fragile handle very carefully Acontroller board contains integrated circuits which are susceptible to failure due to static discharge It is especially importa
17. ameplate for the required refrigerant charge 11 Replace the removed parts in the reverse order of which they were removed 12 Replace the top insulation and the panels in their correct position 13 Plug in the icemaker and turn on the power supply 38 8 Removal and Replacement of Water Regulating Valve Water Cooled Model Only 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 1 Turn off the power supply and unplug the icemaker 2 Close the water supply line shut off valve 3 Remove the panels 4 Recover the refrigerant and store it in an approved container 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 valve and braze the capillary tube 9 Install the new drier 10 Check for leaks using nitrogen gas 140 PSIG and soap bubbles 11 Evacuate the system and charge it with refrigerant See the nameplate for the required refrigerant charge 12 Connect the flare connections 13 Open the water supply line shut off valve 14 Check for water leaks 15 Replace the panels in their correct positions 16 Plug in the icemaker and turn on the power supply 39 9 Adjustment of Water Regulating Valve Water Cooled Model Only The
18. an motor 6 Remove the fan motor bracket 7 Remove the fan motor from the bracket 8 Install the new fan motor and replace the removed parts in the reverse order of which they were removed 9 Replace the panels in their correct positions 10 Plug in the icemaker and turn on the power supply 12 Removal and Replacement of Water Valve 1 Turn off the power supply and unplug the icemaker 2 Close the water supply line shut off valve 3 Disconnect the water supply piping 4 Remove the front panel and the top panel 5 Disconnect the valve outlet tubing by releasing the clamp 6 Disconnect the terminals from the water valve 42 7 Remove the fitting and the gasket 8 Release the hose clamp and disconnect the hose 9 Remove the water valve from the rear panel 10 Loosen the two screws and remove the water valve barrier 11 Secure the water valve barrier to the new water valve 12 Install the new water valve and replace the removed parts in the reverse order of which they were removed 13 Replace the panels in their correct positions 14 Open the water supply line shut off valve 15 Plug in the icemaker and turn on the power supply 13 Removal and Replacement of Pump Motor Note When replacing a pump motor with defective winding it is recommended that a new capacitor be installed 1 Turn off the power supply and unplug the icemaker 2 Remove the front top and right side panels 3 Open
19. ater tank After draining replace the plug in its correct position 13 Repeat 5 through 12 one time then go to 14 49 14 Move the control switch to the ICE position to fill the water tank with water 15 After 3 minutes move the control switch to the OFF position 16 Move the control switch to the WASH position 17 After 5 minutes move the control switch to the OFF position 18 Remove the plug to drain the water tank After draining replace the plug in its correct position 19 Repeat 14 through 18 two times to rinse thoroughly 20 Flush the storage bin with water 21 Move the control switch to the ICE position and start the automatic icemaking process 22 Replace the front panel in its correct position and close the door 50 3 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 exterior occasionally with a clean and soft cloth Use a damp cloth containing a neutral cleaner to wipe off oil or dirt build up 2 Storage Bin and Scoop e Wash your hands before removing ice Use the plastic scoop provided e The storage bin is for ice use only Do not store anything else in the bin e Keep the scoop clean Clean it by using a neutral cleaner and rinse thoroughly e Clean the bin liner by using a neutral cleaner Rinse thoroughly aft
20. cccccccccnccccccnncnnnnnnnnccnnncnnnnccnnnncnnnnnnns 0 Y 00 A oh 39 11 Removal and Replacement of Fan Motor Except Water Cooled Model 42 12 Removal and Replacement of Water Valve ooooconccccccccccccccconccnncccnnnccnnnnononcncnnnnnnannns 42 13 Removal and Replacement of Pump Motor 43 14 Removal and Replacement of Float Switch 44 15 Removal and Replacement of Spray Tubes non nnnnnns 44 VI Cleaning and EE EE 45 1 Preparing the Icemaker for Long Storage ee 45 2 Cleaning and Sanitizing Instructions EEN 47 a GIGANING MONON a 47 b Cleaning PROC GOES eene ina 47 cl Sanitizing SOMO att aid est sez cS IR vv cas 49 lee e Weier 49 os MGIC Eine 51 I Specifications 1 KM 250BAF AC SUPPLY VOLTAGE AMPERAGE APPROXIMATE ICE PRODUCTION PER 24 HR Ibs day kg day Reference without marks SHAPE OF ICE ICE PRODUCTION PER CYCLE 115 60 1 10 5 A 5 Min Freeze AT 104 F WT 80 F 165228 ICO ae Oe ee A 70 80 90 100 Crescent Cube 3 70 Ibs 1 7 kg 200 pcs APPROXIMATE STORAGE CAPACITY ELECTRIC amp WATER CONSUMPTION ELECTRIC W KWH 100 lbs WATER _ gal 24HR gal 100 lbs EXTERIOR DIMENSIONS WxDxH EXTERIOR FINISH WEIGHT CONNECTIONS ELECTRIC WATER SUPPLY DRAIN CUBE CONTROL SYSTEM HARVESTING CONTROL SYSTEM ICE MAKING WATER CONTROL COOLING WATER CONTROL BIN CONTROL SYSTEM COMPRESSOR CONDENSER EVAPORATOR REFRIGERANT CONTROL REFRIGERANT
21. ctor disconnected See 11 2 e Checking the Controller Board Place in position Leads opened or defective switch Check and replace Float does not move freely Clean or replace maker will not b Controller Board start 3 Compressor will not start a Wash Switch Defective WASH position Replace Move to ICE position Bad contacts Check and replace b High Pressure Control or operates intermittently Dirty air filter or condenser Clean Ambient or condenser water temp too warm Reduce ambient temp Refrigerant overcharged Recharge Condenser water pressure too low or off Water cooled model only Check and get recommended pressure Fan not operating Except water cooled model See chart 1 6 Refrigerant line or components plugged Clean and replace drier c Overload Protector Bad contacts Check for continuity and replace Voltage too low Increase voltage Refrigerant overcharged or undercharged Recharge d Starter Bad contacts Check and replace Coil winding opened Replace e Start Capacitor Defective Replace f Magnetic Contactor Bad contacts Check for continuity and replace Coil winding opened Replace g Compressor
22. d See 11 2 e Checking the Controller Board Replace Bearing worn out Replace Wiring to fan motor Check for loose connection or open and replace Fan blade bound Check and replace b Controller Board 7 All components a Refrigerant run but no ice is produced Defective Undercharged See 11 2 e Checking the Controller Board Check for leaks and recharge Air or moisture trapped Replace drier and recharge b Compressor Defective valve Replace C Hot Gas Solenoid Valve Continues to open in freeze cycle Check and replace d Water Solenoid Valve Stuck open Diaphragm bleed port clogged 29 Replace Clean or replace diaphragm 2 Evaporator is Frozen Up PROBLEM POSSIBLE CAUSE REMEDY 1 Freeze cycle time is too long 2 All ice formed on evaporator does not fall into bin in harvest cycle 3 Others a Float Switch Leads short circuit or defective switch 1 Check and replace Float does not move freely 2 Clean or replace b Water Solenoid Valve Diaphragm does not close Check for water leaks with icemaker off c Controller Board a Evaporator Defective Scaled up See 11 2 e Checking the Controller Board 1 Clean b Water Supply Line Water pressure too low
23. e Motor E Discharge Line Compressor Access Valve TT Refrigerant Circuit Expansion Valve mums Water Circuit 20 b KM 250BWF Water Regulating Valve Spray TUBO Condenser A Water Valve DM SN Y ai A eer r Stat Water Evaporator i Access Valve j Drier z Eed j Thermistor TEN Switch High Float Switch j i Strainer d EE Hot Gas darem Valve 21 DON 03100 019 ANO PSIG 21 3 0 2 Wiring Diagram KM 250BAF KM 250BWF Eon A psi 1018 geiw S CH FU ORE EASI E zax Wat ug ED di DIS Ed AL zo 00 IE M E S ity S ibis ILHA M Cel E CD CO Gd GED Mt eege V i i ID AN L Saud Ok HES co T aum SH Say ae A am D i EN d THIN ek ET o Le oO Di moi poem E H SC Mo y Lei 1 9 CoH Lh BE wt Eet ES la lor i Lo QNO y uOISTRERL erf TOULNG NIG Note Pressure Switch HI KM 250BWF KM 250BAF 427 PSIG 21 3 0 284 5 21 3 PSIG 467 Cut out Cut in 256 21 3 PSIG 22 3 Timing Chart When Control Sw is turned OFF Pressure Sw is OFF or Thermistor Temp exceeds tl From Defrost Cycle To Defrost Cycle i i If Float Sw is OFF Lun em i m Hi Teme Mid Tempj Lo Temp Too Lo Tema Normal Too Hi Temp jLo Wate Initial Defrost Freeze ti Thermisto
24. eplacement has been made 1 Turn off the power supply and unplug the icemaker 2 Remove the panels 3 Recover the refrigerant and store it in an approved container 4 Remove the drier 5 Install the new drier with the arrow on the drier in the direction of the refrigerant flow Use nitrogen gas at the pressure of 3 4 PSIG when brazing the tubings 6 Check for leaks using nitrogen gas 140 PSIG and soap bubbles 7 Evacuate the system and charge it with refrigerant See the nameplate for the required refrigerant charge 8 Replace the panels in their correct position 9 Plug in the icemaker and turn on the power supply 35 5 Removal and Replacement of Expansion Valve IMPORTANT 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 Do not replace the drier until after all other repair or replacement has been made 1 Turn off the power supply and unplug the icemaker 2 Remove the panels 3 Recover the refrigerant and store it in an approved container 4 Remove the insulation and the expansion valve bulb on the suction line 5 Remove the expansion valve cover and disconnect the expansion valve using brazing equipment 6 Braze the new expansion valve with nitrogen gas flowing at the pressure of 3 4 PSIG WARNING 1 Do not heat the wall Place a steel bar
25. er cleaning 3 Air Filter air cooled model only A plastic mesh air filter removes dirt or dust from the air and keeps the condenser from getting clogged As the filter gets clogged the icemaker s performance will be reduced Check the filter at least twice a month When clogged use warm water and a neutral cleaner to wash the filter 4 Condenser except water cooled model Check the condenser once a year and clean if required by using a brush or vacuum cleaner More frequent cleaning may be required depending on the location of the icemaker 51
26. ergize the unit and confirm that the defrost timer is in the minimum position Disconnect the resistor from the controller board and energize the unit After the 1 minute water supply cycle the defrost cycle starts Reconnect a 1 5 kQ 3 5 kQ resistor to the connector K3 pins 1 and 2 after the first 2 minutes of the defrost cycle The unit should start the freeze cycle after 1 minute 5 seconds from the resistor connection 3 Check the controller board by using test program of the controller board i ii iii Disconnect the connector K1 from the controller board Set the dip switch No 7 and 8 on the controller board to the ON position and energize the unit The current flows to each relay from X1 to X4 one after another every time the float is raised and the contacts close See the following chart and check OPEN and CLOSE of pins of the connector K1 at each step If the checks are completed turn off the icemaker plug the connector K1 into the controller board as before and set the dip switch No 7 amp 8 to the OFF position 19 Ill Technical Information 1 Water Circuit and Refrigerant Circuit a KM 250BAF Condenser Access Valve Water AER Pressure a SEGITERERERATERORNITES Sw i t ch d Hig h Water Setz dv n 7 j ap Evaporator qu J Drier Cleaning n Valve iil j Thermistor i Insulation Tube Float Ji Switch d 8 Strainer a Pump Se
27. lug the icemaker 2 Remove the front panel top panel and top insulation 3 Disconnect the hoses 4 Lift off the spray tubes 5 Install the new spray tubes Note Place the spray tubes so that the holding tabs on both sides are in position 6 Connect the hoses 7 Replace the top insulation top panel and front panel in their correct positions 8 Plug in the icemaker and turn on the power supply 44 VI Cleaning and Maintenance IMPORTANT Ensure all components fasteners and thumbscrews are securely in place after any maintenance or cleaning is done to the equipment 1 Preparing the Icemaker for Long Storage WARNING When shutting off the icemaker for an extended time drain out all water from the water tank and remove the ice from the storage bin The storage bin should be cleaned and dried Drain the icemaker to prevent damage to the water supply line at sub freezing temperatures using air or carbon dioxide Shut off the icemaker until the proper ambient temperature is resumed When the icemaker is not used for two or three days it is sufficient to only move the control switch to the OFF position unless the icemaker will be at sub freezing tem peratures 1 On water cooled model only first remove the water from the water cooled condenser 1 Remove the front panel 2 Move the control switch on the control box to the OFF position 3 Wait 3 minutes 4 Move the control switch to the ICE
28. master or shorted thermistor 2 beeps every 3 sec Defrost Back Up Timer Defrost gt 20 minutes Orange LED marked 20 MIN energizes Check for open thermistor HGV not opening TXV leaking by low charge or inefficient compressor 3 beeps every 3 sec Freeze Back Up Timer Freeze gt 60 minutes Yellow LED marked 60 MIN energizes 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 with the power supply ON 6 beeps every 3 sec Low Voltage Voltage is 92 Vac or less 7 beeps every 3 sec High Voltage Control voltage gt 147 Vac 5 The red LED will de energize if voltage protection operates The voltage safety automatically resets when voltage is corrected The Output Test switch S3 provides a relay sequence test With power OFF place S3 ON and switch power to ICE The correct lighting sequence should be none 2 3 4 1 amp 4 normal sequence every 5 seconds S3 should remain in the OFF position for normal operation The application switch located between relay X3 amp 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
29. ng the defrost cycle the evaporator temperature rises The thermistor senses 48 F and starts the defrost timer After the defrost timer counts down to zero the normal freeze cycle begins If the evaporator temperature continues to rise the thermistor will sense the rise in temperature and at 127 7 F the thermistor operates the high temperature safety This high temperature safety shuts down the circuit and the icemaker automatically stops To reset the safety turn the power off and back on again This high temperature safety protects the unit from excessive temperature The control board will beep every 3 seconds The white reset button on the control board must be pressed with power on to reset the safety 4 Low Water Safety If the pump motor is operated without water the mechanical seal can fail To prevent 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 is in the up position electrical circuit closed the controller board changes to the ice making cycle If the float switch is in the down position electrical circuit open the controller board changes to a one minute water fill cycle before starting the ice making cycle This method allows for a low water safety shut down to protect the water pump from mechanical seal failure For water cooled model if the water is shut off the unit is pr
30. nt to touch the metal part of the unit when handling or replacing the board Do not touch the electronic devices on the board or the back of the board to prevent damage to the board Do not change wiring and connections Especially never misconnect K3 K4 and K5 because the same connector is used for the thermistor and float switch K4 is not connected Do not fix the electronic devices or parts on the board in the field Always replace the whole board assembly when it goes bad Do not short out power supply to test for voltage PART NUMBER TYPE 2A1410 01 HOS 001A Control Products Features of Control Products E Controller Board 1 Maximum Water Supply Period 6 minutes Water solenoid valve opening in the defrost harvest cycle is limited by the defrost timer The water valve cannot remain open longer than the maximum period The water valve can close in less than six minutes if the defrost cycle is completed 9 2 Defrost Timer The defrost cycle starts when the float switch opens and completes the freeze cycle But the defrost timer does not start counting until the thermistor senses 48 F at the evaporator outlet The period from the end of the freeze cycle up to the point of the thermistor s sensing varies depending on the ambient and water temperatures 3 High Temperature Safety 127 7 F The temperature of the suction line in the refrigerant circuit is limited by the high temperature safety Duri
31. off the power supply and unplug the icemaker 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 discharge and suction pipes using brazing equipment 6 Remove the hold down bolts washers and rubber grommets 7 Slide and remove the compressor Unpack the new compressor package Install the new compressor 8 Attach the rubber grommets of the prior compressor 9 Sandpaper the suction discharge and process pipes 10 Place the compressor in position and secure it using the bolts and washers 11 Remove plugs from the suction discharge and process pipes 12 Braze the process suction and discharge lines Do not change this order while purging with nitrogen gas flowing at the pressure 3 4 PSIG 13 Install the new filter drier 14 Check for leaks using nitrogen gas 140 PSIG and soap bubbles 34 15 Evacuate the system and charge it with refrigerant See the nameplate for the required refrigerant charge 16 Connect the terminals and replace the terminal cover in its correct position 17 Replace the panels in their correct position 18 Plug in the icemaker and turn on the power supply 4 Removal and Replacement of Drier 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 r
32. onds 150 seconds ON OFF 10 seconds 180 seconds OFF ON 10 seconds 120 seconds ON ON 20 seconds 180 seconds T1 Time to drain the water tank T2 Time to restrain defrost completion 4 Drain Counter CAUTION Do not adjust the drain counter or the evaporator may freeze up The drain counter is factory adjusted to drain 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 table below 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 cycles 5 Freeze Timer CAUTION Adjust to proper specification or the unit may not operate correctly Two new dip switches numbered 9 and 10 have been added to the improved E board to better prevent possible freeze ups These settings come factory set to the default setting of 60 min OFF OFF 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 Switch Dip Switch No 9 No 10 OFF OFF 60 min ON OFF 70 min OFF ON 50 min ON ON 60 min 6 Bin Control CAUTION When the ambient temperature is below 45 F the bin control thermostat operates to stop the icemaker even if the ice storage bin is empty When the
33. otected by the high pressure switch 5 High Voltage Cutout The maximum allowable supply voltage of this icemaker is limited by the high voltage cutout If miswiring especially on single phase 3 wire models causes excessive voltage on the controller board the high voltage cutout shuts down the circuit in 3 seconds and the icemaker automatically stops When the proper supply voltage is resumed the icemaker automatically starts running again The control board will signal this problem using 7 beeps every 3 seconds 6 LED Lights and Audible Alarm Safeties The red LED indicates proper control voltage and will remain on unless a control voltage problem occurs At startup a 5 second delay occurs while the board conducts an internal timer check A short beep occurs when the power switch is turned ON or OFF 10 The green LED s 1 4 represent the corresponding relays and energize and sequence 5 seconds from initial start up as follows Sequence Step LED s on Length Min Max Avg 1 Minute Fill Cycle LED4 60 sec Harvest Cycle LED1 4 amp 2 2 min 20 min 3 5 min Freeze Cycle LED1 5 min 60 min 30 35 min Reverse Pump Out LED1 3 amp 2 10 sec 20 sec Factory set LED 1 Comp LED 2 HGV CFM LED3 PM LED 4 WV The built in safeties shut down the unit and have alarms as follows 1 beep every 3 sec High Evaporator Temperature gt 127 F Check for defrost problem stuck HGV or relay hot water entering unit stuck head
34. r ege 1 Temp a H ON ll 2 2 Float Switch OFF L ROA 3 Compressor 4 Heater Fan Motor amp Line Valve OFF 6 7 Fan Motor ON Condenser Unit or i o Water Valve 2 omr ees ON Hot Gas Valve 2 OFF ir 1 The pump motor for KM 250B series does not have drain cycle 2 The icemaker does not complete a defrost cycle in the first 2 or 3 minutes See II 2 d Controls and Adjustments 23 To Stand by Cycle When Control Sw is turned OFF Pressure Sw is OFF or Thermistor Temp exceeds t1 To Freeze Cycle rom Freeze Cycle H 1 r High Temp Mid Temp Low Temp Too Low Temp NO Defrost include drain Thermistor 1 Temp ON y OFF LAS ON 3 Compreesor OFF SE gt 4 Heater OPP A gt gt Ae Control Sw in Icemaking WASH 5 Pump Meier orr HN N NY Drain 44 2 6 Fan Motor ON i SOR WE lore A AAA p 7 Fan Motor en T Condenser Unit OFF ON 8 Water Valve 2 a ba W M orr KL E LIN 1 ORENSE NTRA ERIE GIC ON 9 Hot Gas Vaive 2 OFF 1 The pump motor for KM 250B series does not have drain cycle 2 The icemaker does not complete a defrost cycle in the first 2 or 3 minutes See II 2 d Controls and Adjustments 24 4 Performance Data a KM 250BAF APPROXIMATE ICE AMBIENT TEMP WATER TEMP EC PRODUCTIO
35. rier 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 7 Install the new drier 8 Check for leaks using nitrogen gas 140 PSIG and soap bubbles 9 Evacuate the system and charge it with refrigerant See the nameplate for the required refrigerant charge 10 Attach the bulb to the suction line in position Be sure to secure it with clamps and to insulate it 11 Place the new set of expansion valve covers in position 12 Replace the panels in their correct position 13 Plug in the icemaker and turn on the power supply 36 6 Removal and Replacement of Hot Gas Valve CAUTION Always use a copper tube of the same diameter and length when replacing the hot gas lines otherwise the performance may be reduced 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 1 Turn off the power supply and unplug the icemaker 2 Remove the panels 3 Recover the refrigerant and store it in an approved container 4 Remove the screw and the solenoid 5 Disconnect the hot gas valve using brazing equipment 6 Install the new valve WARNING 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
36. s ipid inc Oti a ei ET den 2 Gontrollep ORIG EE alSolic State CONTO EE ebe E BOSEU EE ef er EE d Controls and Adjustments EE e Checking the Controller Board ssssssssssseseeseeeeeeeeeen enne IIl Technical Information e oum aqu Id T Water Circuit and Refrigerant elt EE la NA SORA eec reiecit TO BIKM 250BW Er IMM RU Te Le EE KM 250BAF KM 250BWF egene ege STE UI VN PP E Leger EE a KM 250BA EE ai te a a a a a vaste TEREA IV Service Diagnosis aa sete EEGENEN WING ICS PrOQUCION EE 2 Evaporator is Prozac dE SOW IGE POCO EH V Removal and Replacement of Components sssssssssssssssseeeennnennn 1 Service for Refrigerant LIU iaa a Refrigerant e EE b Evacuation and Recharge R 404A A a A CMS Removal and Replacement of Compressor coocoooococococccccccnnnnnnnnnnnncncnonnnononinnnnanananano nono Removal and Replacement of Drier EEN Removal and Replacement of Expansion Valve oooocccccccccccccccncccnnnnncnnnnnccnnnnnnnnnonononons Removal and Replacement of Hot Gas Valve ooooooooooooccccccccccccnononccncncnnncnnnnananananann nono Removal and Replacement of Evaporator ssssessessssnnreeerrrrrreerrrrnrrrnttrrrrernerennnnn nenne Removal and Replacement of Water Regulating Valve Water Cooled Model Only 9 Adjustment of Water Regulating Valve Water Cooled Model Only 10 Removal and Replacement of Thermistor oooooooon
37. shes and the cleaning solution 20 Rinse the parts in the previous step thoroughly with water 48 c Sanitizing Solution Dilute 1 fl oz 30 ml or 2 tbs of 5 25 sodium hypochlorite solution chlorine bleach with 2 gallons 7 6 I of warm water Using a chlorine test strip or other method confirm that you have a concentration of about 200 ppm IMPORTANT For safety and maximum effectiveness use the solution immediately after dilution d Sanitizing Procedure The sanitizing process will sanitize the icemaker 1 Wash the bin liner thermostat bracket water tank overflow pipe O ring and overflow cap using the sanitizing solution If possible soak the water tank overflow pipe and overflow cap in the sanitizing solution in a clean container for 10 minutes 2 Discard the sanitizing solution and rinse the parts in the previous step thoroughly with water 3 Replace the parts in their correct positions Note Be sure to correctly replace the overflow pipe O ring to prevent leaks 4 Pull out the cap at the front of the plastic body 1 or more 5 Mix a new batch of the sanitizing solution and pour it into the water tank 6 Replace the cap in its correct position 7 Allow the sanitizer to sit for 10 minutes 8 Move the control switch to the WASH position 9 Close the door 10 After 15 minutes move the control switch to the OFF position 11 Open the door 12 Remove the plug to drain the w
38. the bin door 4 Drain the water tank by removing the plug 5 Disconnect the overflow drain hose 6 Release the hose clamp and disconnect the hose for the spray tube 7 Remove the two screws the conduit holder and the conduit 8 Remove the closed end connectors of the pump motor leads 9 Remove the screw and the pump motor bracket 10 Lift up the pump motor with the pump motor bracket 11 Release the hose clamp and disconnect the hose for the cleaning valve 12 Remove the four screws and the pump motor 43 13 Install the new pump motor and replace the removed parts in the reverse order of which they were removed 14 Close the bin door 15 Replace the panels in their correct positions 16 Plug in the icemaker and turn on the power supply 14 Removal and Replacement of Float Switch 1 Go through the steps 1 through 9 in 13 Removal and Replacement of Pump Motor 2 Remove the connectors of the float switch 3 Remove the screw and the float switch bracket 4 Remove the two screws and the float switch 5 Take off the hose sleeving the float switch leads 6 Sleeve the leads of the new float switch with the hose 7 Install the new float switch and replace the removed parts in the reverse order of which they were removed 8 Go through the steps 15 through 17 in 13 Removal and Replacement of Pump Motor 15 Removal and Replacement of Spray Tubes 1 Turn off the power supply and unp
39. the door 8 Replace the front panel in its correct position 9 Close the drain valve 46 2 Cleaning and Sanitizing Instructions IMPORTANT Ensure all components fasteners and thumbscrews are securely in place after any maintenance or cleaning is done to the equipment WARNING 1 HOSHIZAKI recommends cleaning this unit at least once a year More frequent cleaning however may be required in some existing water conditions 2 To prevent injury to individuals and damage to the icemaker do not use ammonia type cleaners 3 Always wear liquid proof gloves to prevent the cleaning and sanitizing solutions from coming into contact with skin a Cleaning Solution Dilute 7 fl oz 207 ml of recommended cleaner Hoshizaki Scale Away or LIME A WAY Economics Laboratory Inc with 1 3 gallons 4 9 I of warm water IMPORTANT For safety and maximum effectiveness use the solution immediately after dilution b Cleaning Procedure The cleaning process will remove lime deposits from the water system 1 Remove the front panel 2 Remove all ice from the evaporator and the storage bin Note To remove cubes on the evaporator move the control switch to the OFF position and move it back to the ICE position after 3 minutes The defrost cycle starts and the cubes will be removed from the evaporator 3 Move the control switch to the OFF position Open the door 47 4 Remove the plug at the bo
40. thermostat is set in the prohibited range the icemaker operates continuously even if the ice storage bin is filled with ice Setting in the prohibited range might cause severe damage to the icemaker resulting in failure No adjustment is required under normal use as the bin control is factory adjusted Ad just it if necessary so that the icemaker stops automatically within 10 seconds after ice contacts the bin control thermostat bulb 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 defrost timer to minimum position Disconnect the thermistor from the controller board Connect a 1 5 KQ 3 5 KQ resistor to the connector K3 pins 1 and 2 and energize the unit ii iii iv After the 1 minute 5 second water supply cycle and the 2 minute 10 second defrost cycle the unit should start the freeze cycle After the above step i disconnect the float switch leads from the controller board within the first 5 minutes of the freeze cycle The unit should go into the defrost cycle after the first 5 minutes 20 seconds of the freeze cycle Reconnect the float switch connector to the controller board After the first 5 minutes of the freeze cycle disconnect the float switch leads from the controller board At this point the unit should start the defrost cycle After step iii de en
41. 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 Never allow the oil in the vacuum pump to flow backward 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 32 5 Disconnect the vacuum pump and attach a refrigerant service cylinder to the low side line Remember to loosen the connection and purge the air from the hose See the nameplate for the required refrigerant charge Hoshizaki recommends only virgin refrigerant or reclaimed refrigerant which meets ARI Standard No 700 88 be used 6 Open the low side valve Do not invert the service cylinder A liquid charge will damage the compressor 7 Turn on the icemaker when charging speed gets slow Turn off the icemaker when the low side gauge shows approximately O PSIG Do not run the icemaker at negative pressures Close the low side valve when the service cylinder gets empty 8 Repeat the above steps 4 through 7 if necessary until the required amount of refrigerant has entered the system 9 Close the two refrigerant access valves and disconnect the hoses and service manifold 10 Cap the access valves to prevent a possible leak 2 Brazing DANGER Refrigerant R 404A itself is not flammable explosive
42. ttom of the water tank to drain the tank See Fig 4 After ga S draining replace the plug in its correct Se s ii ze 5 Pull out the cap at the front of the plastic body 1 or more See Fig 5 6 Pour the cleaning solution into the water tank Pull out ab Overflow Drain Hose Fig 4 Thumbscrew 7 Replace the cap in its correct position 8 Move the control switch to the WASH position Close the door 9 After 30 minutes move the control switch to l the OFF position Ca 10 Remove the plug to drain the water tank j After draining replace the plug in its correct position i 11 Move the control switch to the ICE position to fill the water tank with water 12 After 3 minutes move the control switch to Fig 5 the OFF position 13 Move the control switch to the WASH position 14 After 5 minutes move the control switch to the OFF position 15 Remove the plug to drain the water tank After draining replace the plug in its correct position 16 Repeat 11 through 15 three more times to rinse thoroughly 17 Remove the thermostat bracket and the water tank from the bin by removing the two thumbscrews for each at the top of the bin and disconnect one end of the overflow drain hose See Fig 4 18 Mix a new batch of the cleaning solution 19 Wash the bin liner the thermostat bracket the water tank bracket and the water tank using a nylon scouring pad bru
43. ures 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 kQ 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 10 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 KQ 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 suitable 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 a longer setting by adjusting the dip switch No 1 amp 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 3 Drain Timer The drain timer is factory adjusted and no adjustment is required SETTING TIME Dip Switch Dip Switch No 3 No 4 T1 T2 OFF OFF 10 sec
44. utes even if defrost timer does not stop counting 14 d Controls and Adjustments The dip switch is factory adjusted to the following positions Switch Nos 1 and 2 Used for adjustment of the defrost timer The defrost timer starts counting when the thermistor reads a certain temperature at the evaporator outlet Switch Nos 3 and 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 determined by the drain timer The drain timer also determines the time to restrain completion of a defrost cycle i e the minimum defrost time Switch Nos 5 and 6 Used for adjustment of the drain counter The pump motor drains the water tank at the frequency determined by the drain counter Switch Nos 7 and 8 Used only for checking the controller board Usually set in OFF position Switch Nos 9 and 10 Used for adjustment of freeze timer The freeze timer determines maximum Control Board Check only OFF Drain Counter freeze cycle time Upon termination of un freeze timer machine initiates the DEE S harvest cycle After 2 consecutive timer Defrost Timer terminations machine will shut down possibly indicating a problem 1 Defrost Control A thermistor semiconductor is used for a defrost control sensor The resistance varies depending on the suction line temperat
45. valve broken Mounting pad out of Reinstall position d Refrigerant Lines Rub or touch lines or other 1 Replace surfaces 3 Ice in storage a Bin Drain Plugged bin often melts 31 V Removal and Replacement of Components IMPORTANT Ensure all components fasteners and thumbscrews are securely in place after the equipment is serviced IMPORTANT The Polyol Ester POE oils used in R 404A units can absorb moisture quickly Therefore it is important to prevent moisture from entering the system when replacing or servicing parts Always install a new filter drier every time the sealed refrigeration system is opened Do not leave the system open for longer than 5 minutes when replacing or servicing parts 1 Service for Refrigerant Lines a Refrigerant Recovery The icemaker unit is provided with two refrigerant access valves one on the low side and one on the high side lines Recover the refrigerant from the access valves and store itin an approved container Do not discharge the refrigerant into the atmosphere Earlier models did not have high side access valves on air cooled and water cooled models It may be necessary to install a high side access valve to completely recover the refrigerant b Evacuation and Recharge R 404A 1 Attach charging hoses a service manifold and a vacuum pump to the system IMPORTANT The vacuum level and vacuum pump may be the same as
46. will remain energized 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 7 amp 8 must remain in the OFF position Dip Switch Output Test Switch_ Used to test Relays on Board Alarm_Reset Switch 00088L0 OUTPUT TEST Backup Freeze Timer LED HUP EU SOME Connector K3 Defrost Control Thermistor Backup Defrost Timer LED Connector K4 Open not connected Alarm Buzzer Nix Microprocessor Will indicate Board revision level on attached label last 2 digits Power LED Lights up when power is supplied to the Board Pins 1 through 10 1 9 Magnetic Contactor 2 Hot Gas Valve 3 Line Valve 4 Pump Motor icemaking 5 Pump Motor drain 6 Water Valve 7 10 Power line Bin Control 8 Open Switch for C Board Indicate which i and ALPINE Board Relays are energized Service Boards only Boards only Transformer Connector Control Products HOS 001A Board 12 c Sequence 1st Cycle 1 Unit energized and control switch to ICE 3 Thermistor reads 48 F position Water supply cycle starts Defrost timer starts counting 2 After 1 minute defrost cycle starts WATER VALVE WATER VALVE HOT GAS VALVE FREEZE IMPORTANT Water valve opening is limited to 6 minutes PUMP amp FAN amp LINE VALVE
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