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Service Manual

1. N3349 YD q 3n8 1H9rrng m r 1300H 31002 MV 1740 MOTBA A ASLL w Ago PAI i f 1 t 1 3 mt sivo ngo Nid d INNO 49u40JSU 4I oo Sad qarar ins AVYD H Hs wa yg 4 39NVM0 JAWA JAWA M3 VM 0 HilMVIS QdH M HSVM 18 28 JUHM M s NMOUE Ug t 3003 40702 SYM A 2 LI oj 2 oS 391 XY 0 i Fp OR 7 m O38 1 Gy j dv NAY yoojg Q 9 oh yeuluay 09 5 v doss ldulo2 o N 101 M AD HOLIMS A Ce sins d ig E Y e s T 4 i M 1 y YHL ng1 4 lo w wol 19L HJ1IMS H21IMS 0M1N02 NIB TOSINO Ps p el HILIMS 1701 QNO NE 28 2 Multimeter Access Points a Diagnostic Connector A diagnostic connector is included in the control box to allow easier access for a multimeter The diagnostic connector terminals correspond to components as outlined in Fig 2 Motor P Liquid Hot V P Line Gas Pump Control Valve Valve Motor Switch Fig 2 O GY V Inlet Drain Magnetic Water Valve Contactor Valve b Compressor Terminal Block A compressor terminal block is included in the control box to allow easier access for a multimeter The terminal block terminals
2. Standard Storage IL oe D Bin Control Bin Applications TU H The mechanical bin control is a lever actuated 5 e ho e proximity switch used to control the level of ice in poes S 21 Rear D i i i Interior the dispenser unit storage bin There are 2 sets Dispenser Unit m of mounting holes on the rear interior wall For Applications dispenser unit applications the lower set of holes Lower Set of Holes 4 Recommended WW Al is recommended When installed on a standard 27 AN NM Thumbscrews EM Hoshizaki storage bin either set of holes is ERE acceptable See Fig 1 The bin control should be l Hone mounted flush with the dispenser unit storage bin Fia 1 Some Parts wall 9 Removed for Clarity The bin control is connected to the K1 nine pin connector pins 4 amp 5 on the control board When the actuator paddle is not engaged bin control switch closed POWER OK LED on the unit produces ice When the actuator paddle is engaged bin control switch open POWER OK LED flashing the control board drains the water tank and then shuts down the unit Note that there is a delay before the shutdown sequence begins The delay varies depending on the cycle the icemaker is in at the time of activation For details see the table below Cycle at Bin Control Activation Delay Before Shutdown Sequence Begins Fill Cycle Harvest Cycle 15 seconds after the
3. 59 J Removal and Replacement of Thermistor cccccccseceeeeeeseeeeseeeeeeeeeeeeeeeeeeeeeeaeesneneees 60 K Removal and Replacement of Fan Motor air cooled and remote air cooled models 61 L Removal and Replacement of Water 5 61 M Removal and Replacement of Pump Motor cccceceeeeeeeeeeeeeeeeeeeeseeeeeeeeeeeeeeees 62 N Removal and Replacement of Control 4 esses 62 Vi Cleaningi nd TMS TING NR T 63 A Cleaning and Sanitizing insiruciisns zaya ARALI me dana qm op eet 63 Hh SAINT PROC EQ UNG isso 63 2 Sanitizing Procedure Following Cleaning Procedure 65 B MaihienantE n si b y E a EE E E aaa 66 C Preparing the leemaker for Long Storage retis ote sina eure 67 Important Safety Information Throughout this manual notices appear to bring your attention to situations which could result in death serious injury or damage to the unit Ai WARNING Indicates a hazardous situation which could result in death or serious injury CAUTION Indicates a situation which could result in damage to the unit IMPORTANT Indicates important information about the use and care of the unit A WARNING This icemaker should be destined only to the use for which it has been expressly conceived Any other use should be consid
4. 17 b Harvest Backup Timer and Freeze Timer 8 17 c High Temperature kon uni ax Rana 17 d L w Wat r Safety TNR Eom 17 e High Voltage and Low Voltage 1 15 17 f LED Lights and Audible Alarm Safeties 18 3 Controls and FANS HSN sce aa ise dieit n nb sni ay ya 19 a Default Dip Switch RB aa aaa R R dA D b dad 19 b Harvest Timer 51 dip switch 1 52 L asa d siyasi ins di anaya 20 c Pump Out Timer 91 dip switch 34 coperta aaa 20 d Pump Out Frequency Control S1 dip switch 5 amp 6 21 e Harvest Pump Timer S1 dip switch 7 amp 8 21 f Freeze Timer S1 dip switch 8 amp 10 22 g Pump Out Drain Selector S2 dip switch 1 22 h Float Switch Selector S2 dip switch 2 ss ss a bais prse a yas R 23 i Refill Counter 52 dip switch 9 amp A 23 j Factory Use S2 dip switch daa aaa a aqli pis 23 k Anti Slush Control S2 dip switch Bi AA ad dada 23 3 EE TE aa UE 24 LEM are egre RN 24
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6. Carefully follow any instructions provided with the bottles of cleaning and sanitizing solution 3 Always wear liquid proof gloves and goggles to prevent the cleaning and sanitizing solutions from coming into contact with skin or eyes 4 To prevent damage to the water pump do not leave the control switch in the SERVICE position for extended periods of time when the water tank is empty 1 Cleaning Procedure 1 Dilute 9 5 fl oz 281 ml of Hoshizaki Scale Away with 1 8 gal 6 8 1 of warm 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 4 Remove the front panel then move the service switch to the DRAIN position Move the control switch to the SERVICE position 5 Replace the front panel in its correct position then turn on the power supply for 2 minutes 6 Turn off the power supply 7 Remove the front panel then remove insulation panel A the large insulation panel in front of the evaporator by lifting up the panel slightly and pulling it towards you 63 8 In bad or severe water conditions clean the float switch as described below Otherwise continue to step 9 a Remove the 2 thumbscrews securing insulation panel B then remove insulation panel B See Fig 14
7. Check 1 Low charge 1 Check for leaks Recover repair evacuate and recharge m Water Regulating Valve 1 Leaking by in harvest 1 Check and replace water cooled model 46 Possible Cause 3 Other 8 Ice Cube Guide 1 Out of position 1 Place in position b Bin Control 1 Check and free 2 Defective 2 See IV C Bin Control Check and Cleaning 3 Low Ice Production 1 Freeze cycle time is a Inlet Water Valve 1 Diaphragm does not 11 Check for water leaks with long close icemaker off b Float Switch 1 Float does not move 1 Clean or replace See IV freely or switch D Float Switch Check and defective Cleaning C Thermistor 1 Disconnected loose 1 Connect secure check or defective See V J Removal and Replacement of Thermistor and IV E Thermistor Check 1 Scaled up e Spray Tubes eee eee g Condenser except 1 Air filter or condenser 1 Clean water cooled model clogged h Refrigerant Charge 1 Low charge 1 Check for leaks Recover repair evacuate and recharge i Expansion Valve AER 0 Condenser Water 1 Water regulating valve 1 Adjust or replace See water cooled model set too high V I Adjustment of Water Regulating Valve water cooled model 2 Condenser water 2 Check and get pressure too low recommended pressure 3 Water temperature out 3 Correct to specification of specification m Liquid Line Valve 1
8. Do not discharge the refrigerant into the atmosphere 50 2 Brazing A WARNING 1 R 4044 itself is not flammable at atmospheric pressure and temperatures up to 176 F 80 C 2 R 404A itself is not explosive 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 3 Do not use silver alloy or copper alloy containing arsenic 4 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 nitrogen gas 140 PSIG DO NOT use R 404A as a mixture with pressurized air for leak testing 1 Braze all fittings while purging with nitrogen gas 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 CAUTION 1 Always install a new drier every time the sealed refrigeration system is opened 2 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 3 When brazing protect the drie
9. Turn on the power supply 8 Check for leaks 9 Replace the front panel in its correct position Pump Motor Connector Drain Valve Drain Hose Discharge Thumbscrew Hose Fig 13 N Removal and Replacement of Control Board 1 Turn off the power supply 2 Remove the front panel and the control box cover 3 Disconnect the control board connectors from the control board 4 Remove the control board 5 Adjust the dip switches on the new control board to the factory default settings See II C 3 a Default Dip Switch Settings S2 dip switch 5 must remain off 6 Install the new control board taking care not to damage it 7 Connect the control board connectors to the new control board 8 9 Turn on the power supply Replace the control box cover and front panel in their correct positions 62 VI Cleaning and Maintenance A WARNING CHOKING HAZARD Ensure all components fasteners and thumbscrews are securely in place after any cleaning or maintenance is done to the unit Make sure that none have fallen into the dispenser unit storage bin A Cleaning and Sanitizing Instructions Hoshizaki recommends cleaning and sanitizing this unit at least once a year More frequent cleaning and sanitizing however may be required in some existing water conditions A WARNING 1 To prevent injury to individuals and damage to the icemaker do not use ammonia type cleaners 2
10. b Disconnect the discharge hose the drain valve drain hose and the overflow drain hose c Disconnect the pump motor connector and the float switch connector from the side of the control box d Remove the 2 thumbscrews securing the pump motor and float switch assembly See Fig 15 e Pull out the water tank cube guide and pump motor and float switch assembly together f Remove the screw securing the float switch to the top of the assembly Remove the float switch from the assembly g Remove the retainer rod from the bottom of the float switch then remove the float Be careful not to bend the retainer rod excessively when removing it h Wipe down the float switch housing shaft float and retainer rod with cleaning solution Rinse the parts thoroughly with clean water i Reassemble the float switch Replace the float switch in its correct position then secure with the screw j Replace the removed parts in the reverse order of which they were removed 9 Pour the cleaning solution into the water tank Move the service svvitch to the VVASH position Replace insulation panel A and the front panel in their correct positions 12 13 14 Turn on the power supply to start the washing process Turn off the power supply after 30 minutes Remove the front panel Move the service switch to the DRAIN position Oo Ol Replace the front pan
11. 10 195 J0 98 G euin 2 WNWIUIN 0 snulw 1seAJeu 10 uiBue eui 10 UI 9 2w AM e 2 9199 1no dung t z ld 9 o 2 1soAJEeH Z 11 aNu sdois 3943 o c HVIWOSt QIAS m HEUO AOV I eouenbes peog 104002 H C Control Board A Hoshizaki exclusive solid state control board is employed in KMD 450MAH and KMD 450MWH Modular Crescent Cubers All models are pretested and factory set For a control board check procedure see IV B Control Board Check CAUTION 1 The control board is fragile handle very carefully 2 The 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 before handling or replacing the control board 3 Do not touch the electronic devices on the control board or the back of the control board 4 Do not change wiring and connections 5 Always replace the whole control board assembly if it goes bad 6 Do not short out power supply to test for voltage 1 Control Board Layout Relay LEDs 6 indicate which relays are energized as listed below LED 5 X1 Relay Compressor Comp Fan Motor Remote FMR LED 6 X2 Relay Hot Gas Valve HGV Fan Motor FM Liquid Line Valve LLV FM and LLV off when LED on LED 8 X4 Relay Inlet Water Valve WV WV1 on units with 2 inlet water v
12. 3 When brazing protect the drier by using a wet cloth to prevent the drier from overheating Do not allow the drier to exceed 250 F 121 C 1 Turn off the power supply 2 Remove the panels and the front and top insulation 3 Recover the refrigerant and store it in an approved container 4 Remove the spray tubes spray guides and water guides Remove the insulation at the notch where the refrigeration tubing passes through the molded chassis 5 Disconnect the evaporator tubing Note The pipes in the evaporator case are specially coated to resist corrosion Use sandpaper to remove the coating from the brazing connections before unbrazing 6 Remove the screws securing the evaporator brackets then lift out the evaporator 7 Remove the pop rivets securing the evaporator brackets Attach the evaporator brackets to the new evaporator 8 9 10 11 Install the new evaporator Remove the drier then place the new drier in position Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG 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 nitrogen gas 140 PSIG DO NOT use R 404A as a mixture with pressurized air for leak testing 12 Evacuate the system and charge it with refrigerant For air cooled and water cooled models see the na
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14. Disconnect the harness connector from the bin control switch connector then remove the bin control from the unit 5 Remove the actuator paddle from the switch mount See Fig 5 6 Wipe down the bin control with a mixture of 1 part recommended cleaner Hoshizaki Scale Away and 25 parts warm water Rinse the parts thoroughly with clean water 7 Reassemble the bin control and replace it in its correct position 8 Reconnect the harness connector 9 Move the control switch to the ICE position 10 Replace the front panel in its correct position 11 Turn on the power supply to start the automatic icemaking process D Float Switch Check and Cleaning Bin Control X Switch Connector Harness Wire Connector Connector To Control Board WA K1 nine pin connector Actuator Paddle Fig 5 T 1 Float Switch Check To check the float switch follow the steps below 1 Remove the front panel and move the control switch to the SERVICE position Move the service switch to the DRAIN position 2 Allow the water to drain from the tank then move the control switch to the OFF position 3 Turn off the power supply 4 Disconnect the wire connector from the control board K1 nine pin connector See II C 1 Control Board Layout 5 Check for continuity across the red wires 1 amp 3 of the wire connector With the water tank empty the float switch is open If open continue to step 6 If closed follow the steps in
15. Do not mix lubricants of different compressors even if both are charged with R 404A except when they use the same lubricant 1 Turn off the power supply 2 3 4 Remove the terminal cover on the compressor and disconnect the compressor wiring On remote air cooled model disconnect the crankcase heater Remove the panels Recover the refrigerant and store it in an approved container 5 6 7 8 Remove the drier and the discharge suction and process pipes Remove the hold down bolts washers and rubber grommets Remove the compressor Unpack the new compressor package Attach the rubber grommets of the prior compressor to the nevv compressor 52 9 Place the compressor in position and secure it using the bolts and washers 10 Place the new drier in position 11 Remove the plugs from the suction discharge and process pipes 12 13 Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG 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 nitrogen gas 140 PSIG DO NOT use R 404A as a mixture with pressurized air for leak testing 14 Evacuate the system and charge it with refrigerant For air cooled and water cooled models see the nameplate for the required refrigerant charge For remote air cooled model see the ratin
16. El Thermistor Lead TAR MK SSNS SG m ILL LC s Foam Insulation Thermistor Holder 41 ZZ 22 Fig 9 F Diagnostic Charts 1 No Ice Production Possible Cause 1 The icemaker will not a Power Supply 1 Off blown fuse or 1 Turn on replace or reset tripped breaker 3 Bad contacts 3 Check for continuity and replace 4 Not within 4 Refer to nameplate and specifications correct b Water Supply 1 Water supply off or 1 Check and get pressure too low recommended pressure c Bin Control 1 Tripped with bin filled 1 Remove ice with ice 2 Defective 2 See IV C Bin Control Check d Fuse Control Box 1 Blown 1 Check for short circuit and replace e Control Switch 1 OFF or SERVICE 1 Move to ICE position position 2 Bad contacts 2 Check for continuity and replace f High Pressure Control 1 Bad contacts 1 Check for continuity and replace 2 Dirty air filter or 2 Clean condenser 3 Ambient or condenser 3 Reduce temperature water temperature too warm 4 Refrigerant 4 Recover evacuate and overcharged recharge 5 Fan not operating 5 See chart 1 7 except water cooled model 6 Refrigerant lines or 6 Recover repair replace components restricted drier evacuate and recharge 7 Condenser water 7 Check and get pressure too low or off recommended pressure water cooled model 9 Transformer 1 Coil winding open or
17. Erratic sticking 1 Check and replace n Headmaster C P R 11 Bypassing 1 Replace remote condenser unit 47 Problem Possible Cause 1 Freeze cycle time is o Control Board 1 Refill counter S2 dip 1 Set to factory default long continued switch 3 amp 4 not in position See II C 3 a the factory default Default Dip Switch position Settings 2 Float switch 2 Check and reconnect connection loose 3 Defective 3 See IV B Control Board Check 2 Harvest cycle time is a Water Supply 1 Water temperature 100 1 Increase temperature long cold b Thermistor 1 Disconnected loose 1 Connect secure check or defective See V J Removal and Replacement of Thermistor and IV E Thermistor Check c Control Board 1 Not reading 1 Check and replace thermistor 2 Sending voltage to 2 Check and replace See liquid line valve if IV B Control Board applicable in harvest 1 Check d Inlet VVater Valve 1 Clogged 1 Clean or replace e Evaporator 1 Scaled up 2 Damaged 2 Replace f Hot Gas Valve 1 Does not open or 1 Check and replace opens partially g Expansion Valve 1 Wide open in harvest 1 Check and replace 2 Bulb loose 2 Secure bulb h Water Regulating Valve 1 Open during harvest 1 Adjust or replace See water cooled model V I Adjustment of Water Regulating Valve water cooled model i Liquid Line Valve 1 Open during harvest 11
18. IV D 2 Float Switch Cleaning After cleaning the float switch check it again Replace if necessary 38 6 Reconnect the wire connector to the control board K1 nine pin connector then replace the control box cover in its correct position 7 Move the control switch to the ICE position Replace the front panel in its correct position then turn on the power supply After 1 minute the 1 minute fill cycle should end and the initial harvest cycle should begin If the initial harvest cycle begins the float switch is good and the check is complete If the initial harvest cycle does not begin continue to step 8 8 Turn off the power supply 9 Remove the front panel 10 Move the control switch to the OFF position 11 Remove the control box cover 12 Disconnect the wire connector from the control board K1 nine pin connector 13 Check for continuity across the red wires 1 amp 3 of the wire connector With the water tank full the float switch is closed If the float switch is closed and the icemaker will not switch from the 1 minute fill cycle to the initial harvest cycle replace the control board See V N Removal and Replacement of Control Board If the float switch is open confirm that the float switch connection on the side of the control box is secure and that the water tank is full If the tank is not full check the water supply water filters and inlet water valve If the tank is full follow the steps in IV D 2 Floa
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20. a low water safety to protect PM b Initial Harvest Cycle LEDs 5 6 and 8 are on WV remains energized Comp FMR HGV energize CB monitors the warming of the evaporator via the thermistor located on the suction line When the thermistor reaches 48 F 9 C CB reads a 3 9 kO signal from the thermistor and turns harvest termination over to the harvest timer S1 dip switch 1 amp 2 The harvest timer has settings of 60 90 120 and 180 seconds For details see II C 3 b Harvest Timer S1 dip switch 1 amp 2 WV is energized during harvest for a maximum of 6 minutes or the length of harvest minus 0 10 30 or 50 seconds harvest pump timer S1 dip switch 7 amp 8 whichever is shorter For details see II C 3 e Harvest Pump Timer S1 dip switch 7 amp 8 LED 8 goes off when WV de energizes LED 7 comes on and PM energizes and runs for the last 0 10 30 or 50 seconds of harvest depending on the harvest pump timer setting This circulates water over the evaporator for the last 0 10 30 or 50 seconds of harvest When the harvest timer expires the harvest cycle is complete CB checks the position of F S and proceeds to the freeze cycle if it is closed or calls for a 1 minute fill cycle if it is open The minimum total time allowed by CB for a complete harvest cycle is 2 minutes c Freeze Cycle LEDs 5 amp 7 are on Comp and FMR remain energized PM energizes or remains energized depending on the harvest pump timer S1 dip switch 7
21. amp 2 The harvest timer has settings of 60 90 120 and 180 seconds For details see II C 3 b Harvest Timer S1 dip switch 1 amp 2 WV is energized during harvest for a maximum of 6 minutes or the length of harvest minus O 10 30 or 50 seconds harvest pump timer S1 dip switch 7 amp 8 whichever is shorter For details see II C 3 e Harvest Pump Timer S1 dip switch 7 amp 8 LED 8 goes off when WV de energizes LED 7 comes on and PM energizes and runs for the last 0 10 30 or 50 seconds of harvest depending on the harvest pump timer setting This circulates water over the evaporator for the last 0 10 30 or 50 seconds of harvest When the harvest timer expires the harvest cycle is complete CB checks the position of F S and proceeds to the freeze cycle if it is closed or calls for a 1 minute fill cycle if it is open The minimum total time allowed by CB for a complete harvest cycle is 2 minutes Diagnosis Check if Comp is running HGV and WV still energized Average harvest cycle at factory setting is 2 to 3 minutes How long does initial harvest last 1 5 minutes after initial harvest begins touch Comp discharge line Is it hot If not check refrigerant pressures and Comp operation If it is hot touch the inlet line to the evaporator Is it hot If it is hot and PM does not run per the harvest timer setting and or the freeze cycle does not start check the harvest timer the thermistor for open circuit the discharge line te
22. assembly Remove the float switch from the assembly 10 Remove the retainer rod from the bottom of the float switch then remove the float Be careful not to bend the retainer rod excessively when removing it See Fig 8 11 Wipe down the float switch housing shaft float and retainer rod with a mixture of 1 part Hoshizaki Scale Away and 25 parts warm water Rinse the parts thoroughly with clean water 12 Reassemble the float switch Replace the float switch in its correct position then secure with the screw 13 Move the control switch to the ICE position then replace the removed parts in the reverse order of which they were removed Thumbscrews Shaft Ka Fioat Switch k Pump Motor Housing N and Float 5 Switch B Assembly Float Cube Guide Water Tank 5 Retainer Rod Fig 7 Fig 8 40 E Thermistor Check To check thermistor resistance follow the steps below 1 Turn off the power supply 2 Remove the front panel then move the control switch to the OFF position 3 Remove the control box cover 4 Disconnect the wire connector from the control board K1 nine pin connector See Il C 1 Control Board Layout Make sure the thermistor connection on the side of the control box is secure 5 Remove the plastic cable ties foam insulation thermistor holder and thermistor See Fig 9 6 Immerse the thermistor sensor portion in a glass conta
23. monitors the cooling of the evaporator via the thermistor located on the suction line When the thermistor drops to 34 F 1 C the control board reads a 5 8 kO signal from the thermistor 33 and de energizes PM for 10 seconds The anti slush control is deactivated on the KMD 450MAH and KMD 450MWH CAUTION Do not adjust S2 dip switch 6 out of the factory default position on this model This dip switch must be left in the factory default position or this unit will not operate correctly Diagnosis During the first 5 minutes of freeze confirm that the evaporator temperature drops If the evaporator is not cold check to see if HGV is still open or if TXV is not opening properly if WV is continuing to fill the reservoir if there are improper unit pressures an inoperative Comp or an inoperative HM Place a thermometer on the suction line next to the thermistor When the temperature drops to 36 F 2 C disconnect F S black and red wires at the 3 pin connector on the control box See Fig 4 After approximately 5 minutes the short cycle protection timer expires and the unit should switch out of the freeze cycle If the unit switches out of freeze with F S removed but would previously not switch out of freeze with F S connected long freeze 3 beep alarm F S may be sticking To check and clean F S see IV D Float Switch Check and Cleaning If the unit remains in freeze with F S removed check the thermistor for loose attachment o
24. no adjustment is required However if the icemaker needs a pump out more often due to local water conditions the pump out frequency can be adjusted The pump out frequency control S1 dip switch 5 amp 6 can be set to have a pump out occur every cycle or every 2 5 or 10 cycles For details see II C 3 d Pump Out Frequency Control 51 dip switch 5 amp 6 e Normal Harvest Cycle Same as the initial harvest cycle See II B 1 b Initial Harvest Cycle Note Unit continues to cycle until BC is satisfied or power is turned off The unit always restarts at the 1 minute fill cycle f Shutdown When BC is activated BC open the POWER OK LED flashes There is a delay before the shutdown sequence begins The delay varies depending on the cycle the icemaker is in at the time of activation For details see the table below Cycle at Bin Control Activation Delay Before Shutdown Sequence Begins Fill Cycle Harvest Cycle 15 seconds after the next freeze cycle starts Freeze Cycle 15 seconds if BC is activated between the beginning of freeze and termination of the 5 minute short cycle protection timer timer starts when the thermistor temperature drops to 36 F 2 C 5 5 kO or more After this time the unit will not shut down until the next harvest cycle is complete After the delay all components de energize DV energizes after 2 seconds PM energizes after 2 seconds or stays off depending on the pump out drain selector S2 dip swit
25. prolonged for extra cleaning 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 decreases 24 hour production Note that the pump out timer S1 dip switch 3 amp 4 acts in place of the harvest timer during cycles with a pump out For details see II C 3 c Pump Out Timer S1 dip switch 3 amp 4 S1 Dip Switch Setting Time No 1 No 2 seconds oe or o ON oF go OFF 120 on on m c Pump Out Timer S1 dip switch 3 amp 4 When a pump out is called for the pump motor de energizes after the preceding freeze cycle 2 seconds later the pump motor and drain valve energize The pump motor takes water from the tank and forces it through the drain valve and down the drain The pump motor drains the water tank for the time determined by the pump out timer The pump out timer also acts in place of the harvest timer during cycles with a pump out The pump out timer is factory set and generally no adjustment is required However if the default is 10 seconds and the icemaker needs a longer pump out due to local water conditions the pump out timer can be adjusted to 20 seconds 1 Dip Switch Setting Time seconds No 4 Ti T2 OFF 10 120 180 120 120 180 120 0 0 0 0 FF FF 2 BECAN ov or T 2 T1 Time to drain the vvater tank T2 Harvest timer at pump ou
26. signal from the thermistor and de energizes PM for 10 seconds The anti slush control is deactivated on the KMD 450MAH and KMD 450MWH CAUTION Do not adjust S2 dip switch 6 out of the factory default position on this model This dip switch must be left in the factory default position or this unit will not operate correctly d Pump Out Cycle LEDs 5 6 4 and 7 are on Comp and FMR remain energized HGV energizes LLV and FM de energize DV energizes after a 2 second delay PM de energizes for 2 seconds and then re energizes or de energizes and stays off depending on the pump out drain selector S2 dip switch 1 setting For details see II C 3 g Pump Out Drain Selector S2 dip switch 1 When the pump out drain selector is set to pump out PM takes water from the tank and forces it through DV and down the drain When the pump out drain selector is set to drain water drains by gravity through DV CAUTION Do not adjust S2 dip switch 1 out of the factory default position on this model This dip switch must be left in the factory default position or this unit will not operate correctly Pump out lasts 10 or 20 seconds depending on the pump out timer 51 dip switch 3 amp 4 setting When the pump out timer expires the pump out is complete For details see Il C 3 c Pump Out Timer S1 dip switch 3 amp 4 The first pump out occurs after the 1st freeze cycle then every 10th cycle thereafter The pump out frequency is factory set and generally
27. 1 Replace shorted h Wiring to Control Board 1 Loose connections or 1 Check for continuity and open replace i Thermistor 1 Leads shorted or open 1 See IV E Thermistor and high temperature or harvest backup timer safety operates 1 beep or 2 beep alarm Possible Cause 1 The icemaker will not j Hot Gas Valve Continues to open 1 Check for hot gas valve start continued in freeze cycle and stuck open and replace freeze timer safety operates 3 beep alarm k Inlet Water Valve Mesh filter or orifice 11 Clean gets clogged and water supply cycle does not finish 2 Coil winding open 2 Replace 3 Wiring to inlet water 13 Check for loose valve connection or open and replace Float Switch 1 Bad contacts 1 Check for continuity and replace 2 Float does not move 12 Clean or replace See IV freely or switch D Float Switch Check and defective Cleaning m Control Board 1 Defective or in alarm 1 See IV B Control Board Check 2 Fill cycle will not a Water Supply 1 Water supply off or 1 Check and get terminate pressure too low recommended pressure b Float Switch 1 Connector 1 Reconnect disconnected 2 Float does not move 12 Clean or replace See IV freely or switch D Float Switch Check and defective Cleaning c Control Board 1 Defective 1 See IV B Control Board Check 3 Compressor will a Magnetic Contactor 1 Bad contacts 1 Check for conti
28. 24 EE INC GS NINE RTT 25 UE eue boe P Ramo aya Da RAR s 25 2 SW 0 N Y w 25 a DRAIN PETI ETT EE t 25 D BL TE LL 25 C WAS b 25 IL Technical aida MR een EE ERG 26 A Water Circuit and Refrigeration Cireulb 2 26 1 KMD 450MAH air cooled 26 2 KMD 450MWH walereoolBt uu 27 B Wiring Diagram and Multimeter Access Points 28 1 Wining RI te r op E C e 28 2 M ltimeter Access POIFTIS icd fra pes veuve lub aaa 29 a Diagnostic Chan OL la 29 b Compressor Terminal BIOGK usas pret amaba bayan OPERAR MEE MENFe b sau subayam yad adi 29 C Performance Data NRTROR la an aaa 30 1 KMD 450MAH air cooled p 30 2 KMD 450MWH Waloreo8let ueniunt trata tuni Giua a Uslu babama UE KE d 31 PV OT VIE D QGROS B span 32 A Diagnostic TOGO OS a y l alaqada NON 32 36 Conliol Check and o i E tT 37 TPB Control GNECK Lussasasivsazuecacagauenk dep RE RRORE VER MEI ta EU L2 AL 2s cA D nata Rata S MURS ROLE 37 mls nibe E m T T 37 D Floar Switch Check and Cleaning saos aucune tu puerto ober pnp nua inte sbpotMu quac etd tata
29. 50 10 70 21 90 32 447 70 21 460 209 80 27 450 204 429 90 32 447 203 415 Ibs day kg day 100 38 436 198 406 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 day 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 kg em G 100 38 TOTAL HEAT OF REJECTION FROM CONDENSER 6 800 BTU h AT 90 F 32 C WT 70 F 21 C TOTAL HEAT OF REJECTION FROM COMPRESSOR 1 100 BTU h AT 90 F 32 C WT 70 F 21 C WATER FLOW FOR CONDENSER 40 gal h AT 100 F 38 C WT 90 F 32 C PRESSURE DROP OF COOLING WATER LINE less than 10 PSIG Note 1 Pressure data is recorded at 5 minutes into freeze 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 31 IV Service Diagnosis A WARNING 1 This unit should be diagnosed and repaired only by qualified service personnel to reduce the risk of death electric shock serious injury or fire 2 Risk of electric shock Use extreme caution and exercise safe electrical practices Moving parts e g fan blade can crush and cut Keep hands clear CHOKING HAZARD Ensure all components fasteners and thumbscrews are securely in place after the unit i
30. Check and replace cycle 4 Abnormal Ice Possible Cause 1 Small cubes a Drain Valve 1 Dirty and leaking by 1 Clean or replace b Ice Cube Guide 1 Out of position 1 Place in position Circulated water falls into bin c Water System 1 Water supply line too 1 Increase water line size small requires 3 8 OD line dedicated per machine 2 Water filter clogged or 2 Replace filter or install a flow rate too small higher flow rate filter d Inlet Water Valve 1 Dirty mesh filter or 1 Clean orifice e Pump Motor 1 RPM too slow 1 See chart 1 51 48 Possible Cause 1 Small cubes f Control Board 1 Defective 1 See IV B Control Board continued Check 2 Cloudy or irregular Evaporator 1 Frozen up 1 See chart 2 2 Scaled up 3 Damaged 3 Replace a b Water System 1 Water supply line too 1 Increase water line size small requires 3 8 OD line dedicated per machine 2 Water filter clogged or 2 Replace filter or install a flow rate too small higher flow rate filter 3 High hardness or 3 Install a water softener or contains impurities filter Spray Gui 5 Other Possible Cause 1 Icemaker will not stop a Bin Control iit 3 See IV C Bin Control Check and Cleaning E Abnormal noise b Fan Motor except 1 Bearings worn out 1 Replace water cooled model 12 Fan blade deformed 2 Replace 3 Fan blade does not 3 Replace mov
31. Connector With the unit in the cycle to be tested check output voltage from the corresponding terminal on the diagnostic connector to ground If output voltage is not found and the appropriate LED is on the control board is bad and should be replaced See V N Removal and Replacement of Control Board 36 C Bin Control Check and Cleaning 1 Bin Control Check To check the bin control follow the steps below 1 Turn off the power supply 2 Remove the front panel then move the control switch to the OFF position 3 Remove the control box cover then clear any ice away from the bin control 4 Disconnect the wire connector from the control board K1 nine pin connector See II C 1 Control Board Layout 5 Check for continuity across the black wires 4 amp 5 of the wire connector When the actuator paddle is not engaged the lever actuated bin control switch is closed If the lever actuated bin control switch reads open check that the harness connector is secured to the bin control switch connector and that the actuator paddle is not sticking See Fig 5 Clean if necessary See IV C 2 b Bin Control Cleaning If the bin control switch still reads open replace the bin control 6 Press the actuator paddle check for continuity across the black wires 4 amp 5 of the wire connector When the actuator paddle is engaged the lever actuated bin control switch is open If closed check that the actuator paddle is not restric
32. ECTRIC amp WATER CONSUMPTION ELECTRIC VV kWH 100 lbs WATER gal 24HR gal 100 Ibs CEC CEE TIER LEVEL ENERGY STAR 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 CHARGE DESIGN PRESSURE P C BOARD CIRCUIT PROTECTION COMPRESSOR PROTECTION REFRIGERANT CIRCUIT PROTECTION LOW WATER PROTECTION ACCESSORIES SUPPLIED REQUIRED OPERATING CONDITIONS 115 120 60 1 3 wire with netrual for 115V 10 0 A 5 Min Freeze AT 104 F WT 80 F 15A 15A Ambient WATER TEMP F TempCF 50 70 90 70 457 207 436 198 398 180 80 441 200 409 186 365 165 90 436 198 387 176 344 156 100 425 193 377 171 304 138 Crescent Cube 9 6 Ibs 4 3 kg 432pcs N A 90 70 F 70 50 F 880 5 48 810 4 28 73 18 9 192 42 1 3 YES 30 x 24 1 4 x 22 1 8 762 x 617 x 562 mm Stainless Steel Galvanized Steel Rear Net 130 Ibs 59 kg Shipping 170 Ibs 77 kg Permanent Connection Inlet 1 2 FPT Outlet 3 4 FPT 5 8 OD Tube Float Switch Hot Gas and Water Thermistor and Timer Timer Controlled Overflow Pipe N A Mechanical Lever Switch and Timer Hermetic Model RST45C1E CAA 202 Air Cooled Fin and tube type Vertical type Stainless Steel
33. Hoshizaki America Inc Modular Crescent Cuber Models KMD 450MAH KMD 450MVVH SERVICE MANUAL A Superior Degree of Reliability www hoshizaki com N evercheck Number 73161 Issued 9 3 2009 IMPORTANT Only qualified service technicians should install service and maintain the icemaker No service or maintenance should be undertaken until the technician has thoroughly read this Service Manual Failure to service and maintain the equipment in accordance with this manual may adversely affect safety performance component life and warranty coverage 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 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 Support 770 487 2331 Fax 1 800 843 1056 770 487 3360 E mail techsupport 9 hoshizaki com Web Site www hoshizaki com NOTE To expedite assistance all correspondence communication MUST include the following information Model Number Serial Number Complete and detailed explanation of the problem IMPORTANT This manual should be read carefu
34. Lines A WARNING 1 Repairs requiring the refrigeration circuit to be opened must be performed by properly trained and EPA certified service personnel 2 Always recover the refrigerant and store it in an approved container Do not discharge the refrigerant into the atmosphere 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 nitrogen gas 140 PSIG DO NOT use R 404A as a mixture with pressurized air for leak testing CAUTION Do not leave the system open for longer than 15 minutes when replacing or servicing parts 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 drier 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 When brazing protect the drier by using a wet cloth to prevent the drier from overheating Do not allow the drier to exceed 250 F 121 C 1 Refrigerant Recovery The icemaker unit is provided with refrigerant access valves Using proper refrigerant practices recover the refrigerant from the access valves and store it in an approved container
35. Min Freeze AT 104 F WT 80 F 15A 59080 460 209 447 203 415 188 450 204 429 195 389 177 447 203 415 188 377 171 436 198 406 184 343 156 Crescent Cube 9 3 Ibs 4 2 kg 432pcs N A 90 70 F 70 50 F 790 4 55 790 4 14 74 17 8 145 31 6 523 126 315 68 3 N A 30 x 24 1 4 x 22 1 8 762 x 617 x 562 mm Stainless Steel Galvanized Steel Rear Net 130 Ibs 59 kg Shipping 170 Ibs 77 kg Permanent Connection Inlet 1 2 FPT Outlet 3 4 FPT 5 8 OD Tube Cond Inlet Cond Outlet 1 2 FPT 3 8 FPT Float Switch Hot Gas and Water Thermistor and Timer Timer Controlled Overflow Pipe Pressure Regulator Mechanical Lever Switch and Timer Hermetic Model RST45C1E CAA 202 Water cooled Tube in tube type Vertical type Stainless Steel and Copper Thermostatic Expansion Valve R404A 1 Ib 0 9 oz 480g High 427PSIG Low 230PSIG High Voltage Cut out Internal Auto reset Overload Protector Internal Auto reset High Pressure Control Switch Float Switch N A Ice Dispenser or Ice Storage Bin VOLTAGE RANGE AMBIENT TEMP WATER SUPPLY TEMP WATER SUPPLY PRESSURE 104 127 V 45 100 F 45 90 F 10 113 PSIG Note We reserve the right to make changes in specifications and design without prior notice II General Information A Construction 1 KMD 450MAH air cooled Water Guide Wash Valve hy Spray Guide N i Water Supply Inlet Spray Tube Expa
36. acuate and Check d Water System 1 Water supply line too 11 Increase water line size 45 c Evaporator e Pump Motor f Thermistor g Refrigerant h Expansion Valve i Control Board 2 All ice formed on evaporator does not fall into bin in harvest cycle a Evaporator and Replacement of 1 Low charge recharge 1 Scaled up small requires 3 8 Possible Cause 2 All ice formed on evaporator does not fall into bin in harvest cycle continued f Spray Tubes 9 Thermistor h Hot Gas Valve i Expansion Valve e Inlet Water Valve 1 Dirty mesh filter or 1 Clean orifice 2 Diaphragm does not 12 Check for water leaks with close icemaker off EET 2 Out of position 2 Place in position 1 Disconnected loose 1 Connect secure check or defective See V J Removal and Replacement of Thermistor and IV E Thermistor Check 1 Coil winding open 1 Replace 2 Plunger does not 2 Replace move 3 Wiring to hot gas 3 Check for loose or open valve connection Reconnect or replace 1 Check and replace 2 Bulb loose 2 Secure bulb j Liquid Line Valve 1 Continues to open in 1 Check operation in harvest if applicable harvest cycle cycle and replace k Control Board Refrigerant 1 Harvest timer is set too short 1 Adjust longer referring to ILC 3 b Harvest Timer 81 dip switch 1 amp 2 2 Defective 2 See IV B Control Board
37. alve open blow out the condenser using the compressed air or carbon dioxide supply until water stops coming out 7 Recover the refrigerant and store it in an approved container 8 Disconnect the condenser water inlet and outlet piping and the refrigeration inlet and outlet piping at the condenser 9 10 11 12 Remove the old condenser and install the new condenser Remove the drier then place the new drier in position Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG 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 nitrogen gas 140 PSIG DO NOT use R 404A as a mixture with pressurized air for leak testing 13 Evacuate the system and charge it with refrigerant See the nameplate for the required refrigerant charge 14 Close the drain valve s Open the condenser water supply line shut off valve If connected to a closed loop water supply also open the condenser return outlet shut off valve 15 Check for water leaks 16 Replace the panels in their correct positions 17 Turn on the power supply 57 H Removal and Replacement of Water Regulating Valve water cooled model CAUTION 1 Always install a new drier every time the sealed refrigeration system is opened 2 Do not replace the drier until after all other repair o
38. alves LED 9 X5 Relay Inlet Water Valve 2 WV2 on units with 2 inlet water valves LED 4 X6 Relay Drain Valve DV LED 7 X3 Relay Pump Motor PM ir IB K6 Connector Open K1 1 3 K1 Connector Pins 1 3 Float Switch 2 Open 4 5 Bin Control 6 7 Thermistor 8 9 Open H Control Board K7 Connector Transformer K3 Connector Magnetic Contactor POWER OK LED Lights when power is supplied to the board Flashes when bin control is activated K5 Connector Pins 1 Fan Motor FM Liquid Line Valve LLV 2 Hot Gas Valve 3 Pump Motor 4 Inlet Water Valve 5 Open 6 Drain Valve C 0A900Z H Tap 5 1 Alarm Buzzer OUTPUT TEST Button used to test relays on control board ALARM RESET Button e 1 Dip Switch S2 Dip Switch H Control Board P00013 02 16 2 Features a Maximum Water Supply Period 6 minutes The inlet water valve is open during harvest for 6 minutes or the length of harvest minus O 10 30 or 50 seconds harvest pump timer S1 dip switch 7 amp 8 whichever is shorter For details see II C 3 e Harvest Pump Timer S1 dip switch 7 amp 8 b Harvest Backup Timer and Freeze Timer The harvest backup timer shuts down the icemaker if for two cycles in a row the harvest cycle takes more than 20 minutes to complete The control board signals thi
39. amp 8 setting FM and LLV energize HGV and WV may de energize during harvest cycle de energize CB monitors the cooling of the evaporator via the thermistor located on the suction line When the thermistor drops to 36 F 2 C CB reads a 5 5 kO signal from the thermistor and starts a 5 minute short cycle protection timer CB will not accept a signal from F S until the 5 minute timer expires After the 5 minute timer expires F S assumes control As ice builds on the evaporator the water level in the tank lowers The freeze cycle continues until F S opens and terminates the cycle The float switch selector S2 dip switch 2 and the refill counter S2 dip switch 3 amp 4 allow certain models to use a double F S to refill the water tank during the freeze cycle The KMD 450MAH and KMD 450MWH use a single F S and do not refill For details see II C 3 h Float Switch Selector S2 dip switch 2 and II C 3 i Refill Counter S2 dip switch 3 8 4 CAUTION Do not adjust S2 dip switch 2 3 or 4 out of the factory default position on this model These dip switches must be left in the factory default position or this unit will not operate correctly The anti slush control S2 dip switch 6 helps prevent slushing during the freeze cycle on certain models When activated the control board monitors the cooling of the 11 evaporator via the thermistor located on the suction line When the thermistor drops to 34 F 1 C the control board reads a 5 8 kO
40. and Copper Thermostatic Expansion Valve R404A 1 Ib 5 2 oz 600g High 467PSIG Low 230PSIG High Voltage Cut out Internal Auto reset Overload Protector Internal Auto reset High Pressure Control Switch Float Switch N A Ice Dispenser or Ice Storage Bin VOLTAGE RANGE 104 127 V AMBIENT TEMP 45 100 F WATER SUPPLY TEMP 45 90 F VVATER SUPPLY PRESSURE 10 113 PSIG Note VVe reserve the right to make changes in specifications and design vvithout prior notice 2 KMD 450MWH water cooled AC SUPPLY VOLTAGE AMPERAGE MINIMUM CIRCUIT AMPACITY MAXIMUM FUSE SIZE APPROXIMATE ICE PRODUCTION PER 24 HR Ibs day kg day Reference without marks SHAPE OF ICE ICE PRODUCTION PER CYCLE APPROXIMATE STORAGE CAPACITY ELECTRIC amp WATER CONSUMPTION ELECTRIC VV kWH 100 lbs WATER gal 24HR gal 100 Ibs WATER COOLED CONDENSER gal 24HR gal 100 Ibs CEC CEE TIER LEVEL ENERGY STAR 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 CHARGE DESIGN PRESSURE P C BOARD CIRCUIT PROTECTION COMPRESSOR PROTECTION REFRIGERANT CIRCUIT PROTECTION LOW WATER PROTECTION ACCESSORIES SUPPLIED REQUIRED OPERATING CONDITIONS 115 120 60 1 3 wire with netrual for 115V 8 5A 5
41. ator 25 Ill Technical Information A Water Circuit and Refrigeration Circuit 1 KMD 450MAH air cooled Spray Tubes Condenser Evaporator nlet VVater Valve High Pressure LIITTITTITITI Switch Drain Valve Insulation Tube Thermistor Heat Exchanger Suction Line Strainer Float Switch Water Tank Access Valve Expansion Valve Refrigeration Circuit n n Water Circuit 26 2 KMD 450MWH water cooled Water Regulating Condenser Valve Inlet Water Valve E E m2ran or Return Spray Tubes Evaporator Water Supply Water em High Supply Pressure E Switch Wash Valve Drain Valve Insulation Tube Thermistor Heat Exchanger Strainer Hot Gas Pump Motor 2 Valve Float Switch Water Tank Expansion Valve Refrigeration Circuit Water Circuit 27 control box to allow easier access for a multimeter For details see II B 2 Multimeter Access Points Note A diagnostic connector and a compressor terminal block are included in the a KMD 450MAH air cooled and KMD 450MWH water cooled B Wiring Diagram and Multimeter Access Points 1 Wiring Diagram OlSd 8 LZFY8Z Olsd g127226 umno OISd sizF VBE OlSd ete mono U91IA 55 YIH
42. ch 1 setting For details see II C 3 g Pump Out Drain Selector S2 dip 12 switch 1 When the pump out drain selector is set to pump out PM takes water from the tank and forces it through DV and down the drain When the pump out drain selector is set to drain water drains by gravity through DV CAUTION Do not adjust S2 dip switch 1 out of the factory default position on this model This dip switch must be left in the factory default position or this unit will not operate correctly The water tank drains for a maximum of 5 minutes or until F S opens DV and PM if applicable then de energize When BC closes again calling for ice the unit starts at the 1 minute fill cycle There is a 90 second minimum off time before the icemaker can restart Legend BC bin control CB control board Comp compressor DV drain valve FM fan motor FMR fan motor remote F S float switch HGV hot gas valve LLV liquid line valve PM pump motor WV inlet water valve J9 EM 19 UI AM Jojow duund JNd e e eui pinbiI ATT seb 10U A H YoUMs 1EOL S 4 JOjeJode e OU JO seoejins episino pue pisul eui Uloq Jezniues pue Jeueejo eje noilo o pesn SI SIUL USEM pue JOJOW duind y oi pal ddns si semog HSVM euin jo spoued pepuerxe JO 10jeJode e eui JO eoeuns pisino y 1 AO Jeuee9j JENI o pesn eq ued siu uo JOJOW duind y o peijddns si 90g FIVINOYIO MUE BU SUIP Siu ONLA urejp pue 40
43. correspond to components as outlined in Fig 3 Compressor Comp GY W Common Comp Comp overload Start Run i Fig 3 J Q o Wire Color Code BK black DBu dark blue GY gray O orange P pink R red V violet W white GY Magnetic Start Run Contactor Capacitors 29 W Run Capacitor C Performance Data 1 KMD 450MAH air cooled APPROXIMATE ICE AMBIENT TEMP PRODUCTION PER 24 HR FIC 70 21 80 27 90 32 Ibs day kg day 100 38 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 day 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 em G 100 38 SUCTION PRESSURE 70 21 80 27 90 32 PSIG kg em G 100 38 TOTAL HEAT OF REJECTION FROM CONDENSER 7 700 BTU h AT 90 F 32 C WT 70 F 21 C Note 1 Pressure data is recorded at 5 minutes into freeze 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 30 2 KMD 450MWH water cooled APPROXIMATE ICE AMBIENT TEMP WATER TEMP F C PRODUCTION PER 24 HR 9 9
44. e freely c Compressor 1 Bearings worn out or 1 Replace cylinder valve broken 2 Mounting pad out of 2 Reinstall position d Refrigerant Lines 1 Rub or touch other 1 Reposition lines or surfaces 3 Ice in dispenser a Drain Line s 1 Plugged 1 Clean unit storage bin often b icemaker and 1 Drains not run 1 Separate the drain lines melts Dispenser Unit Storage separately Bin C Ice Cube Guide 1 Out of position 1 Place in position Circulated water falls into bin 4 Pump motor a Control Board 1 Anti slush control 1 Default setting on certain de energizes for S2 dip switch 6 models Set to factory 10 seconds during activated default position See Il freeze cycle C 3 a Default Dip Switch Settings 49 V Removal and Replacement of Components A WARNING 1 This unit should be diagnosed and repaired only by qualified service personnel to reduce the risk of death electric shock serious injury or fire 2 Move the control switch to the OFF position and turn off the power supply before servicing CHOKING HAZARD Ensure all components fasteners and thumbscrews are securely in place after the unit is serviced Make sure that none have fallen into the dispenser unit storage bin Make sure all food zones in the icemaker and dispenser unit storage bin are clean after the unit is serviced For cleaning procedures see VI Cleaning and Maintenance A Service for Refrigerant
45. e 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 o 11 Evacuate the system and charge it with refrigerant See the nameplate for the required refrigerant charge 12 Replace the panels in their correct positions 13 Turn on the power supply G Removal and Replacement of VVater Cooled Condenser CAUTION 1 Always install a new drier every time the sealed refrigeration system is opened 2 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 3 When brazing protect the drier by using a wet cloth to prevent the drier from overheating Do not allow the drier to exceed 250 F 121 C 1 Turn off the power supply 2 Remove the panels 56 3 Close the condenser water supply line shut off valve If connected to a closed loop water supply also close the condenser return outlet shut off valve 4 Open the condenser water supply line drain valve If connected to a closed loop water supply also open the condenser return outlet drain valve 5 Attach a compressed air or carbon dioxide supply to the condenser water supply line drain valve 6 Open the water regulating valve by using a screwdriver to pry up on the spring retainer underneath the spring While holding the v
46. edure see IV E Thermistor Check 24 G Switches The control switch and the service switch are used to control operation and are located on the control box Control Switch The control switch has three positions OFF for power off ICE for icemaking and SERVICE to activate the service switch 2 Service Switch When the control switch is in the SERVICE position the control switch supplies power to the service switch and the icemaker is in service mode The service switch has three positions DRAIN CIRCULATE and WASH See the information below for details of each function Note 1 When the service switch is activated power is supplied to the pump motor 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 When the service switch is active and in the DRAIN position power is supplied to the pump motor and drain valve b CIRCULATE When the service switch is active and in the CIRCULATE position power is supplied to the pump motor only This operation can be used to circulate cleaner for extended periods of time over the outside surface of the evaporator c WASH When the service switch is active and in the WASH position power is supplied to the pump motor and wash valve This operation is used to circulate cleaner and sanitizer over both the inside and outside of the evapor
47. el in its correct position then turn on the power supply for 2 minutes Pump Motor Connector Float Svvitch Connector X Thumbscrews Ike ES E 3 N b eS iz Thumbscrews Pump Motor and Float Switch Assembly Drain Valve Discharge Drain Hose Cube Guide Hose Overflow Insulation Water Tank Drain Hose Panel B Fig 14 Fig 15 64 17 Turn off the power supply then remove the front panel 18 Move the control switch to the ICE position 19 Replace the front panel in its correct position 20 Turn on the power supply to fill the water tank with water 21 Turn off the power supply after 3 minutes 22 Remove the front panel 23 Move the service switch to the WASH position then move the control switch to the SERVICE position 24 Replace the front panel in its correct position 25 26 27 28 29 Turn on the power supply to rinse off the cleaning solution Turn off the power supply after 5 minutes Remove the front panel Move the service switch to the DRAIN position Ss was sf Replace the front panel in its correct position then turn on the power supply for 2 minutes 30 Turn off the power supply 31 Remove the front panel 32 Repeat steps 18 through 31 three more times to rinse thoroughly Note If you do not sanitize the icemaker go to step 14 in 2 Sanitizing Procedure 2 Sanitizing Procedure Following Cleaning P
48. er S1 dip switch 3 amp 4 setting When the pump out timer expires the pump out is complete For details see II C 3 c Pump Out Timer S1 dip switch 3 amp 4 34 The first pump out occurs after the 1st freeze cycle then every 10th cycle thereafter The pump out frequency is factory set and generally no adjustment is required However if the icemaker needs a pump out more often due to local water conditions the pump out frequency can be adjusted The pump out frequency control S1 dip switch 5 amp 6 can be set to have a pump out occur every cycle or every 2 5 or 10 cycles For details see 11 4 Pump Out Frequency Control 51 dip switch 5 amp 6 Diagnosis If PM does not run check to see if pump out drain selector S2 dip switch 1 setting is in the factory default position Check PM circuit and capacitor and PM terminal on the diagnostic connector violet wire for voltage For diagnostic connector details see III B 2 Diagnostic Connector If DV does not open check the supply voltage at DV terminals and check continuity on the coil If water does not pump out check and clean the tubing at DV then check and clean DV assembly 7 Normal Harvest Cycle same as the initial harvest cycle See IV A 4 Initial Harvest Cycle 8 Shutdown See IV C 1 Bin Control Check Note that after a bin control initiated shutdown there is a 90 second minimum off time Legend BC bin control CB control board Co
49. ered improper and therefore dangerous The manufacturer cannot be held responsible for eventual damage caused by improper incorrect and unreasonable use To reduce the risk of death electric shock serious injury or fire follow basic precautions including the following Electrical connection must be hard wired and must meet national state and local electrical code requirements Failure to meet these code requirements could result in death electric shock serious injury fire or severe damage to equipment This unit requires an independent power supply See the nameplate for proper voltage and breaker fuse size Failure to use a proper breaker or fuse can result in a tripped breaker blown fuse or damage to existing wiring This could lead to heat generation or fire THIS UNIT MUST BE GROUNDED Failure to properly ground this unit could result in death or serious injury This unit should be disassembled or repaired only by qualified service personnel to reduce the risk of electric shock injury or fire Do not make any alterations to the unit Alterations could result in electric shock injury fire or damage to the unit l Specifications A Icemaker 1 KMD 450MAH air cooled AC SUPPLY VOLTAGE AMPERAGE MINIMUM CIRCUIT AMPACITY MAXIMUM FUSE SIZE APPROXIMATE ICE PRODUCTION PER 24 HR Ibs day kg day Reference without marks SHAPE OF ICE ICE PRODUCTION PER CYCLE APPROXIMATE STORAGE CAPACITY EL
50. float switch closes the control board changes to the next cycle The unit will not start without adequate water in the tank This serves as a low water safety to protect the water pump For water cooled model if the condenser water supply is shut off the unit is protected by the high pressure switch e High Voltage and Low Voltage Cut outs The maximum and minimum allowable supply voltages of this icemaker are limited by the high voltage and low voltage cut outs If miswiring especially on single phase 3 wire models causes excessive voltage 147Vac 5 or more the high voltage cut out shuts down the circuit in 3 seconds and the icemaker automatically stops The control board will signal this problem using 7 beeps every 3 seconds The icemaker also automatically stops in cases of insufficient voltage 92Vac 596 or less The control board signals this problem using 6 beeps every 3 seconds When the proper supply voltage is resumed the icemaker automatically starts running again f LED Lights and Audible Alarm Safeties At startup a 5 second delay occurs to stabilize the circuit The POWER OK LED indicates proper control voltage and remains on unless a control voltage problem occurs The POWER OK LED flashes continuously when the bin is full and PM and DV energize for a maximum of 5 minutes to drain the water tank LEDs 4 through 9 energize and sequence from initial startup as listed in the table below Note that the order of the LEDs from
51. from BC 2 Turn on the power supply then move the control switch to the ICE position A 5 second delay occurs The POWER OK LED on CB comes on If the POWER OK LED is flashing indicating a full bin check BC See IV C 1 Bin Control Check A WARNING 1 Risk of electric shock Use extreme caution and exercise safe electrical practices 2 Moving parts e g fan blade can crush and cut Keep hands clear 3 1 Minute Fill Cycle LED 8 is on WV energizes After 1 minute CB checks for a closed F S If F S is closed the harvest cycle begins If closed continue to step 4 If open WV remains energized through additional 1 minute fill cycles until water fills the tank and closes F S low water safety Diagnosis If WV does not open check the supply voltage at WV terminals check continuity on the coil confirm the screen or external filter is not plugged no water flow If unit fails to start harvest check for open 32 F S or bad 1 minute timer in CB See IV D Float Switch Check and Cleaning and IV B Control Board Check 4 Initial Harvest Cycle LEDs 5 6 and 8 are on WV remains energized the contactor coil energizes to energize Comp and FMR and HGV energizes CB monitors the warming of the evaporator via the thermistor located on the suction line When the thermistor reaches 48 F 9 C CB reads a 3 9 kO signal from the thermistor and turns harvest termination over to the harvest timer 51 dip switch 1
52. g label inside the icemaker 15 Connect the terminals and replace the terminal cover in its correct position On remote air cooled model connect the crankcase heater 16 Replace the panels in their correct positions 17 Turn on the power supply C Removal and Replacement of Expansion Valve Moisture in the refrigeration circuit may exceed drier capacity and freeze up at the expansion valve CAUTION 1 Always install a new drier every time the sealed refrigeration system is opened 2 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 3 When brazing protect the valve body and drier by using wet cloths to prevent the valve body and drier from overheating Do not allow the valve body or drier to exceed 250 F 121 C 1 Turn off the power supply 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 Place the new expansion valve in position 6 Remove the drier then place the new drier in position 7 Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG 8 Use an electronic leak detector or soap bubbles to check for leaks Add a trace of refrigerant to the system if usi
53. gle or double float switch applications In double float switch applications the float switch selector setting determines whether the lower or upper switch is used to initiate refills during the freeze cycle The KMD 450MAH and KMD 450MWH use a single float switch and do not refill S2 Dip Switch Setting Float Switch Refill Initiation Type with Double Float Switch OFF SmgeorDoue Lower Switch Upper Switch i Refill Counter S2 dip switch 3 amp 4 CAUTION Do not adjust These must be left in the factory default position or the unit will not operate correctly Factory set The refill counter determines the number of refills during the freeze cycle The KMD 450MAH and KMD 450MWH do not refill j Factory Use S2 dip switch 5 Must remain off k Anti Slush Control S2 dip switch 6 CAUTION Do not adjust This must be left in the factory default position or the unit will not operate correctly The anti slush control helps prevent slushing during the freeze cycle on some models It is deactivated on the KMD 450MAH and KMD 450MWH When activated the control board monitors the cooling of the evaporator via the thermistor located on the suction line When the thermistor drops to 34 F 1 C the control board reads a 5 8 kO signal from the thermistor and de energizes the pump motor for 10 seconds S2 Dip Switch Setting Anti Slush Ne Conto 23
54. icemaker water supply line drain valve 3 On water cooled model remove the water from the water cooled condenser 1 Make sure the power supply is off then remove the front panel and right side panel 2 Close the condenser water supply line shut off valve If connected to a closed loop system also close the condenser return line shut off valve 67 3 Open the condenser water supply line drain valve If connected to a closed loop system also open the condenser return line drain valve 4 Attach a compressed air or carbon dioxide supply to the condenser water supply line drain valve 5 Open the water regulating valve by using a screwdriver to pry up on the spring retainer underneath the spring While holding the valve open blow out the condenser using the compressed air or carbon dioxide supply until water stops coming out 6 Close the drain valve s 7 Replace the right side panel and front panel in their correct positions 68
55. ining ice and water for 2 or 3 minutes 7 Check the resistance between the orange wires 6 amp 7 of the wire connector Normal reading is within 4 7 to 6 2 kO If outside the normal reading replace the thermistor See V J Removal and Replacement of Thermistor If inside the normal reading continue to the next step 8 Scrape away the old sealant on the thermistor holder and the suction pipe 9 Wipe off any moisture on the suction pipe 10 Smoothly apply recommended sealant KE4560RTV Part Code 60Y000 11 or 4A0683 01 to the thermistor holder concave 11 Attach the thermistor to the suction pipe in the same position as previous Be very careful to prevent damage to the leads Secure it using the thermistor holder and foam insulation 12 Secure the insulation using plastic cable ties 13 Reconnect the wire connector to the control board K1 nine pin connector then replace the control box cover in its correct position 14 Move the control switch to the ICE position 15 16 Once the harvest cycle starts begin timing the harvest cycle 17 The harvest timer should expire and terminate the harvest cycle within 2 to 3 minutes If the harvest timer does not expire and terminate the harvest cycle the harvest timer is bad and the control board should be replaced See V N Removal and Replacement of Control Board Replace the front panel in its correct position then turn on the power supply Cable Tie 2 Ek
56. l Board If the secondary circuit does not have proper voltage check the control transformer primary circuit Check the control switch wire pink on the diagnostic connector to a white neutral wire for 115V For location of the control switch wire see Ill B 2 Diagnostic Connector Always choose a white neutral wire to establish a good neutral connection when checking voltages For additional checks see IV F 1 1 The icemaker will not start 3 The OUTPUT TEST button provides a relay sequence test Move the control switch to the OFF position While pressing the OUTPUT TEST button move the control switch back to the ICE position The correct LED lighting sequence is 5 6 7 8 9 4 Note that the order of the LEDs from the outer edge of the board is 5 6 8 9 4 7 Components e g compressor cycle during the test Each LED stays on for 5 seconds LED 5 stays on while LED 6 is on The POWER OK LED flashes once when the first relay LED turns on twice when the second relay LED turns on and adds one flash for each LED thereafter A beep also sounds as each LED turns on Following the test the icemaker resumes operation If the LEDs do not light as described above the control board is bad and should be replaced See V N Removal and Replacement of Control Board 4 Utilize the diagnostic connector to verify voltage output from the control board to the components For diagnostic connector details see 11 2 Diagnostic
57. lly before the icemaker is serviced or maintenance operations are performed Only qualified service technicians should install service and maintain the icemaker Read the warnings contained in this booklet carefully as they give important information regarding safety Please retain this booklet for any further reference that may be necessary CONTENTS Important Safety Informatio maa dal a 6 l Specifications a UNUM ME 7 A cama ooo o E 7 1 KMD 450MAH air cooled 7 2 KMD 450MWH pu rasan A qaa sca D R edam IRE 8 IL Ge eral Informatio ss mad adada maa ba a a pr GENE 9 9 1 KMD 450MAH E 9 2 KMD 450NIWH waler COOlGtl amal 10 B RS 11 1 Sequence Cycles and Shutdown 11 cm u ipeucte ana 11 B anc Harvest Cycle Mm Rm 11 c Freeze O n qe a 11 d umud aa a acca 12 Ee Normal Harvest CCS A Ra aybaay asas ad 12 t FUEL OW ao d E ay 12 2 Sequence Flow 14 C Control H D EA 15 1 Control Board OU sinsear A R EA EAE AANE 16 2 xcii abad aaa aa E a 17 a Maximum Water Supply Period 6 65 222
58. mance Data If it is not in the proper range verify the refrigerant charge 3 Check that the condenser drain temperature is stable Adjustment Screw CW Higher CCW Lower Top View Fig 10 59 J Removal and Replacement of Thermistor This section covers removal and replacement of the thermistor For a thermistor check procedure see IV E Thermistor Check CAUTION 1 The thermistor is fragile handle very carefully 2 Always use the recommended sealant high thermal conductive type Model KE4560RTV manufactured by SHINETSU SILICONE Part Code 60Y000 11 or Part Code 4A0683 01 or equivalent 3 Always use the recommended foam insulation non absorbent type or equivalent 4 Do not shorten or cut the thermistor leads 1 Turn off the power supply 2 3 4 Disconnect the thermistor orange wires at the 2 pin connector on the control box See Fig 11 5 Remove the plastic cable ties foam insulation thermistor holder and thermistor See Fig 12 Remove the panels Remove the control box cover Thermistor Connector orange wires 6 Scrape away the old sealant on the thermistor holder and the suction pipe 7 Wipe off any moisture on the suction pipe 8 Smoothly apply recommended sealant KE4560RTV Part Code 60Y000 11 Cable Tie Thermistor Lead or 4A0683 01 to the thermistor holder concave 9 Attach the nevv thermistor to the suction pi
59. meplate for the required refrigerant charge For remote air cooled model see the rating label inside the icemaker 13 Replace the removed parts in the reverse order of which they were removed 14 Replace the insulation and the panels in their correct positions 15 Turn on the power supply 55 F Removal and Replacement of Air Cooled Condenser CAUTION 1 Always install a new drier every time the sealed refrigeration system is opened 2 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 3 When brazing protect the drier by using a wet cloth to prevent the drier from overheating Do not allow the drier to exceed 250 F 121 C Turn off the power supply 2 3 Remove the panels Recover the refrigerant and store it in an approved container O A Disconnect the condenser inlet and outlet piping Remove the corner barrier from the condenser O Remove the screws securing the condenser assembly then remove the assembly N Install the new condenser then attach the corner barrier 00 Remove the drier then place the new drier in position 9 Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG Use an electronic leak detector or soap bubbles to check for leaks Add a trace of refrigerant to th
60. moval and Replacement of Water Valves 1 Turn off the power supply 2 If replacing the inlet water valve close the icemaker water supply line shut off valve Open the icemaker water supply line drain valve 3 Remove the panels 4 Disconnect the tubing attached to the valve If replacing the inlet water valve loosen the fitting nut Be careful not to lose the washer 5 Disconnect the terminals from the valve 6 Remove the bracket if applicable and valve from the unit 7 Install the new valve Replace the removed parts in the reverse order of which they were removed If replacing the inlet water valve make sure the washer is in place in the fitting nut 8 If replacing the inlet water valve close the icemaker water supply line drain valve Open the icemaker water supply line shut off valve 9 Turn on the power supply 10 Check for leaks 11 Replace the panels in their correct positions 61 M Removal and Replacement of Pump Motor 1 Turn off the power supply 2 Remove the front panel 3 Disconnect the discharge hose and the drain valve drain hose See Fig 13 4 Disconnect the pump motor connector from the side of the control box 5 Remove the thumbscrew securing the pump motor to the top of the assembly Remove the pump motor from the assembly 6 Wire and install the new pump motor and replace the removed parts in the reverse order of which they were removed Be sure to connect the ground wire 7
61. mp compressor DV drain valve FM fan motor FMR fan motor remote F S float switch HGV hot gas valve HM headmaster C P R LLV liquid line valve PM pump motor TXV thermostatic expansion valve WV inlet water valve 35 B Control Board Check Before replacing a control board that does not show a visible defect and that you suspect is bad always conduct the following check procedure This procedure will help you verify your diagnosis Alarm Reset If the control board is in alarm beeping press the ALARM RESET button on the control board with power on Once reset the unit starts at the 1 minute fill cycle For audible alarm information see II C 2 f LED Lights and Audible Alarm Safeties 1 Check the dip switch settings to assure that S1 dip switch 3 4 7 8 9 amp 10 and S2 dip switch 1 through 6 are in the factory default position S1 dip switch 1 2 5 amp 6 are cleaning adjustments and the settings are flexible For factory default settings see Il C 3 a Default Dip Switch Settings 2 Move the control switch to the ICE position If the POWER OK LED is on or flashing if the bin is full the control voltage is good If the POWER OK LED is off check the control transformer secondary circuit Transformer output is 10 5V at 115V primary input If the secondary circuit has proper voltage and the POWER OK LED is off the control board is bad and should be replaced See V N Removal and Replacement of Contro
62. mperature PM circuit and capacitor PM terminal on the diagnostic connector violet wire for voltage Comp efficiency and if HGV is fully open For a thermistor check including harvest timer check see IV E Thermistor Check For diagnostic connector details see III B 2 Diagnostic Connector 5 Freeze Cycle LEDs 5 and 7 are on Comp and FMR remain energized PM LLV and FM energize WV and HGV de energize CB monitors the cooling of the evaporator via the thermistor located on the suction line When the thermistor drops to 36 F 2 C CB reads a 5 5 signal from the thermistor and starts a 5 minute short cycle protection timer After the 5 minute short cycle protection timer expires CB turns freeze termination over to F S The float switch selector S2 dip switch 2 and the refill counter S2 dip switch 3 amp 4 allow certain models to use a double F S to refill the water tank during the freeze cycle The KMD 450MAH and KMD 450MWH use a single F S and do not refill For details see II C 3 h Float Switch Selector S2 dip switch 2 and II C 3 i Refill Counter 52 dip switch 3 amp 4 CAUTION Do not adjust S2 dip switch 2 3 or 4 out of the factory default position on this model These dip switches must be left in the factory default position or this unit will not operate correctly The anti slush control S2 dip switch 6 helps prevent slushing during the freeze cycle on certain models When activated the control board
63. next freeze cycle starts Freeze Cycle 15 seconds if BC is activated between the beginning of freeze and termination of the 5 minute short cycle protection timer timer starts when the thermistor temperature drops to 36 F 2 C 5 5 kO or more After this time the unit will not shut down until the next harvest cycle is complete For a bin control check procedure see IV C 1 Bin Control Check E Float Switch The float switch is used to determine that there is sufficient water in the tank after the 1 minute fill cycle and after each harvest cycle The float switch is also used to determine that the appropriate volume of water has been converted into ice before switching out of the freeze cycle Finally the float switch is used to determine that the water tank is empty during the drain that occurs as part of a bin control activated shutdown No adjustment is required For a float switch check procedure see IV D 1 Float Switch Check F Thermistor The thermistor is used as a harvest control sensor freeze cycle 5 minute short cycle protection timer sensor and anti slush sensor The thermistor s resistance varies depending on the suction line temperature The control board monitors the resistance to start the harvest timer start the freeze cycle 5 minute short cycle protection timer and momentarily stop the pump motor during the freeze cycle if the anti slush control is activated No adjustment is required For a thermistor check proc
64. ng 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 53 9 Evacuate the system and charge it with refrigerant For air cooled and water cooled models see the nameplate for the required refrigerant charge For remote air cooled model see the rating label inside the icemaker 10 Attach the expansion valve bulb to the suction line in the same location as the previous bulb The bulb should be between the 10 and 2 o clock position on the tube Be sure to secure the bulb with the clamp and holder and to insulate it 11 Place the expansion valve cover in position 12 Replace the panels in their correct positions 13 Turn on the power supply D Removal and Replacement of Hot Gas Valve or Liquid Line Valve CAUTION 1 Always use a copper tube of the same diameter and length when replacing the valve lines otherwise performance may be affected 2 Always replace the strainer when replacing the hot gas valve 3 Always install a new drier every time the sealed refrigeration system is opened 4 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 5 When brazing protect the valve body and drier by using wet cloths to prevent the valve body and drier from overheating Do not allow the valve body or drie
65. nsion Valve el ae ie Junction Box Hot Gas Valve A q Condenser sa d Condenser Fan Motor Inlet Water Valve Control Switch Service Switch Drain Valve Water Tank Drier Compressor N Control Box N Pump Motor Float Switch Bin Control 2 KMD 450MWH water cooled Wash Valve Water Guide i Water Supply Inlet S Guid PU HIS Expansion Valve Spray Tube 2 Junction Box Hot Gas Valve Condenser Inlet Water Water Regulator Valve Control Switch Drain Valve Service Switch Compressor Water Tank Drier Pump Motor N Control Box Bin Control 10 B Sequence of Operation Sequence Cycles and Shutdown The steps in the sequence are as outlined below When power is supplied CB POWER OK LED comes on There is a 5 second delay before startup Note that the order of the component LEDs from the outer edge of CB is 5 6 8 9 4 7 a 1 Minute Fill Cycle LED 8 is on WV energizes and the 1 minute fill cycle begins After 1 minute CB checks for a closed F S If F S is closed the harvest cycle begins If not WV remains energized through additional 1 minute fill cycles until water fills the tank and closes F S This serves as
66. nuity and not start or stops replace operating 2 Coil winding open 2 Replace b Start Capacitor or Run 1 Defective 1 Replace 7 Internal Overload 1 Loose terminal 1 Tighten or replace Protector Open check 1 through 3 to the right 2 Voltage 2 Check and correct d Starter 1 Bad contacts 1 Check and replace 2 Coil winding open 2 Replace e Compressor 1 Power supply not 1 Refer to nameplate and within specifications correct 2 Wiring to compressor 2 Check for loose connection or open and replace 3 Defective 3 Replace 4 Protector tripped 4 Reduce temperature f Control Board 1 No power to contactor 1 See IV B Control Board Check 43 Possible Cause 4 Water continues to a Water Pressure 1 Too high be supplied in freeze b Inlet Water Valve 1 Diaphragm does not 11 Check for water leaks with cycle close icemaker off c Control Board 1 Defective 1 See IV B Control Board Check 5 Pump motor will not a Pump Motor 1 Motor winding open 11 Replace start 2 Bearing worn out 2 Replace 3 Wiring to pump motor 3 Check for loose connection or open and replace 4 Defective capacitor 14 Replace 5 Defective or bound 5 Replace and clean impeller b Control Board 1 Defective 1 See IV B Control Board Check c Control Switch 1 Bad contacts 1 Replace 6 Freeze cycle time is a Drain Valve 1 Leaking by 1 Clean or replace to
67. o short b Float Switch 1 Dirty or erratic 1 See IV D Float Switch operation Check and Cleaning c Control Board 1 Defective 1 See IV B Control Board Check d VVater System 1 VVater leaks 1 Check connections for water leaks and repair 7 Fan motor will a Fan Motor 1 Motor winding open 11 Replace not start or is not 2 Bearing worn out 2 Replace 7 PP 7 3 VViring to fan motor 3 Check for loose connection or open and replace 4 Defective capacitor 14 Replace 5 Fan blade bound 5 Check and replace b Control Board 1 Defective 1 See IV B Control Board Check 8 All components a Refrigerant 1 Low charge 1 Check for leaks Recover run but no ice is repair evacuate and produced recharge 2 Air or moisture 2 Recover replace drier trapped evacuate and recharge b Compressor 1 Defective 1 Replace c Hot Gas Valve 1 Continues to open in 1 Check and replace freeze cycle d Liquid Line Valve 1 Continues to close in 11 Check and replace if applicable freeze cycle e Inlet Water Valve 1 Inlet water valve is 1 Check for water leaks with wide open during icemaker off freeze f Expansion Valve 1 Bulb loose 1 Secure bulb 2 Operating erratically 12 Check and replace 44 Possible Cause 8 All components run but no ice is produced continued g Headmaster C P R remote condenser unit h Water Supply Line water cooled model 1 Not o
68. ol voltage safeties automatically reset when 147Vac 5 or more voltage is corrected Legend Comp compressor DV drain valve FM fan motor FMR fan motor remote F S float switch HGV hot gas valve HM headmaster C P R LLV liquid line valve PM pump motor TXV thermostatic expansion valve WRV water regulating valve WV inlet water valve 18 3 Controls and Adjustments CAUTION Dip switches are factory set Failure to maintain factory settings may adversely affect performance and warranty coverage For more information contact Hoshizaki Technical Support at 1 800 233 1940 a Default Dip Switch Settings The dip switches are factory set to the following positions Sip Sted DpSwenNo 1 2 s s e 7 8 9 DipSutenno Ti 2 3 4 ss ON OFF OFF OFF OFF ov S1 Dip Switch S2 Dip Switch Al kAv Harvest Pump Timer Refill Counter 3 amp 4 Pump Out Frequency 51775 3 amp 4 Control 5 amp 6 Float Switch Selector 2 Pump Out Timer 3 amp 4 Pump Out Drain Harvest Timer 1 amp 2 Selector 1 b Harvest Timer S1 dip switch 1 amp 2 The harvest timer starts when the thermistor reaches 48 F 9 C at the evaporator outlet and the control board reads the thermistor s 3 9 kO signal The harvest timer is factory set and generally no adjustment is required However a setting longer than the factory setting may be advised in cases where the flush provided at harvest needs to be
69. pe in the same position as the previous thermistor Be very careful to prevent damage to the leads Secure it using the thermistor holder and recommended foam a ral AS NINN CR 22 lb sas 5 insulation Thermistor Holder 10 Secure the insulation using the plastic cable ties Fig 12 11 Connect the thermistor orange wires at the 2 pin connector on the control box Note Do not shorten or cut the thermistor leads 12 Replace the control box cover and the panels in their correct positions 13 Turn on the power supply 60 K Removal and Replacement of Fan Motor air cooled and remote air cooled models Note When replacing a fan motor with defective winding it is recommended that a new capacitor be installed 1 Turn off the power supply 2 Remove the panels 3 Remove the junction box cover from the remote condenser unit remote air cooled model 4 Disconnect the fan motor wires and the capacitor wires 5 Remove the fan motor bracket fan motor and capacitor 6 Install the new fan motor and capacitor onto the fan motor bracket Install the assembly into the icemaker and connect the fan motor and capacitor wires Make sure the wires are properly routed in the wire saddles and do not interfere with the fan blade 7 Replace the panels in their correct positions 8 Replace the junction box cover in its correct position remote air cooled model 9 Turn on the power supply L Re
70. pe the exterior occasionally with a clean soft cloth Use a damp cloth containing a neutral cleaner to wipe off oil or dirt buildup 2 Dispenser Unit Storage Bin and Scoop Wash your hands before removing ice Use the plastic scoop provided bin accessory The dispenser unit storage bin is for ice use only Do not store anything else in the dispenser unit storage bin Clean the scoop and the dispenser unit storage bin liner using a neutral cleaner Rinse thoroughly after cleaning 3 Air Filters air cooled model Plastic mesh air filters remove dirt and dust from the air and keep the condenser from getting clogged As the filters get clogged the icemaker s performance will be reduced Check the filters at least twice a month When clogged use warm water and a neutral cleaner to wash the filters 4 Condenser air cooled model Check the condenser once a year and clean the coil if required by using a brush or vacuum cleaner More frequent cleaning may be required depending on location 66 C Preparing the Icemaker for Long Storage CAUTION 1 When storing the icemaker for an extended time or in sub freezing temperatures follow the instructions below to prevent damage 2 To prevent damage to the water pump do not leave the control switch in the SERVICE position for extended periods of time when the water tank is empty When the icemaker is not used for two or three days under normal conditions it is sufficient
71. perating properly 1 Replace headmaster and liquid line temperature too warm Condenser water pressure too low or 1 Check and get recommended pressure off and high pressure control opens and closes frequently i Water Regulating Valve 1 Set too high water cooled model 1 Adjust or replace See V I Adjustment of Water Regulating Valve water cooled model 2 Evaporator is Frozen Up Possible Cause 1 Freeze cycle time is a Inlet Water Valve 1 Diaphragm does not 11 Check for water leaks with close icemaker off too long b Float Switch 1 Float does not move 11 Clean or replace See IV freely or switch D Float Switch Check and defective Cleaning 1 Scaled up 2 Damaged 2 Replace d Spray Tubes 2 Out of position 2 Place in position 1 RPM too slow 1 See chart 1 5 1 Disconnected loose 1 Connect secure check Thermistor and IV E Thermistor Check Check for leaks Recover 1 Bulb loose 1 Secure bulb 2 Operating erratically 2 Check and replace 1 Defective 1 See IV B Control Board 2 Damaged 2 Replace b Ambient and or Water 11 Too cool 1 Increase temperature Temperature c Water Supply Line 1 Water pressure too 1 Check and get low recommended pressure OD line dedicated per machine 2 Water filter clogged or 2 Replace filter or install a flow rate too small higher flow rate filter or defective See V J Removal repair ev
72. r by using a wet cloth to prevent the drier from overheating Do not allow the drier to exceed 250 F 121 C 2 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 nitrogen gas 140 PSIG DO NOT use R 404A as a mixture with pressurized air for leak testing 3 Evacuation and Recharge R 404A 1 Attach a vacuum pump to the system Be sure to connect the charging hoses to both high and low side access valves IMPORTANT The vacuum level and vacuum pump may be the same as 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 Open the gauge manifold valves 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 51 4 Close the low side valve and high side valve on the gauge manifold 5 Disconnect the gauge manifold hose from the vacuum pump and attach it to a refrigerant service cylinder Remember to loosen the connection and purge the air from the hose For air cooled and water cooled models see the nameplate for the required refrigerant charge For remote air cooled model see the rating label inside the icemaker Hoshizaki recommends only virgin refrigerant or
73. r out of spec For a thermistor check see IV E Thermistor Check If the unit remains in freeze with F S removed and the thermistor is properly attached and within spec replace CB See V N Removal and Replacement of Control Board Note Normal freeze cycle will last 20 to 40 minutes depending on model and conditions Cycle times and pressures should follow performance data provided in this manual See III C Performance Data Bin Control Wires black Fig 4 Float Switch Connector black and red wires Thermistor Connector orange wires 6 Pump Out Cycle 10 20 second pump out LEDs 5 6 4 and 7 are on Comp and FMR remain energized HGV energizes LLV and FM de energize DV energizes after a 2 second delay PM de energizes for 2 seconds and then re energizes or de energizes and stays off depending on the pump out drain selector S2 dip switch 1 setting For details see II C 3 g Pump Out Drain Selector S2 dip switch 1 When the pump out drain selector is set to pump out PM takes water from the tank and forces it through DV and down the drain When the pump out drain selector is set to drain water drains by gravity through DV CAUTION Do not adjust S2 dip switch 1 out of the factory default position on this model This dip switch must be left in the factory default position or this unit will not operate correctly Pump out lasts 10 or 20 seconds depending on the pump out tim
74. r replacement has been made Install the new drier with the arrow on the drier in the direction of the refrigerant flow 3 When brazing protect the drier by using a wet cloth to prevent the drier from overheating Do not allow the drier to exceed 250 F 121 C 1 Turn off the power supply 2 Remove the panels 3 Close the condenser water supply line shut off valve If connected to a closed loop water supply also close the condenser return outlet shut off valve 4 Open the condenser water supply line drain valve If connected to a closed loop water supply also open the condenser return outlet drain valve 5 Attach a compressed air or carbon dioxide supply to the condenser water supply line drain valve 6 Open the water regulating valve by using a screwdriver to pry up on the spring retainer underneath the spring While holding the valve open blow out the condenser using the compressed air or carbon dioxide supply until water stops coming out 7 8 9 10 11 12 13 14 Recover the refrigerant and store it in an approved container Disconnect the capillary tube at the condenser outlet Disconnect the flare connections of the valve Remove the screws and the valve from the bracket nstall ihe nevv valve Remove the drier then place the nevv drier in position Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG Use an elect
75. r to exceed 250 F 121 C 1 Turn off the power supply 2 Remove the panels 3 Recover the refrigerant and store it in an approved container 4 Remove the solenoid 6 Place the new valve and strainer if applicable in position 7 Remove the drier then place the new drier in position 8 Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG 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 nitrogen gas 140 PSIG DO NOT use R 404A as a mixture with pressurized air for leak testing 5 Disconnect the valve If replacing the hot gas valve also remove the strainer 10 Evacuate the system and charge it with refrigerant For air cooled and water cooled models see the nameplate for the required refrigerant charge For remote air cooled model see the rating label inside the icemaker 11 Replace the solenoid in its correct position 54 12 Replace the panels in their correct positions 13 Turn on the power supply E Removal and Replacement of Evaporator CAUTION 1 Always install a new drier every time the sealed refrigeration system is opened 2 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
76. reclaimed refrigerant which meets ARI Standard 700 latest edition be used 6 A liquid charge is recommended for charging an R 404A system Invert the service cylinder and place it on scales Open the high side valve on the gauge manifold 7 Allow the system to charge with liquid until the proper charge weight is met 8 If necessary add any remaining charge to the system through the low side Use a throttling valve or liquid dispensing device to add the remaining liquid charge through the low side access valve with the unit running 9 Close the gauge manifold valves and disconnect the gauge manifold hoses 10 Cap the access valves to prevent a possible leak B Removal and Replacement of Compressor CAUTION 1 Always install a new drier every time the sealed refrigeration system is opened 2 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 3 When brazing protect the drier by using a wet cloth to prevent the drier from overheating Do not allow the drier to exceed 250 F 121 C 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
77. rocedure 1 Dilute 0 9 fl oz 27 ml of a 5 25 sodium hypochlorite solution chlorine bleach with 1 8 gal 6 8 1 of warm water 2 Remove insulation panel A 3 Pour the sanitizing solution into the water tank 4 Move the service switch to the WASH position 5 Replace insulation panel A and the front panel in their correct positions 6 Turn on the power supply to start the sanitizing process 7 Turn off the power supply after 15 minutes 8 Remove the front panel 9 Move the service switch to the DRAIN position 10 Replace the front panel in its correct position then turn on the power supply for 2 minutes 11 Turn off the power supply 12 Remove the front panel 13 Repeat steps 18 through 31 in 1 Cleaning Procedure two times to rinse thoroughly 14 Move the control switch to the ICE position 65 15 Replace the front panel in its correct position 16 Clean the dispenser unit storage bin liner using a neutral cleaner Rinse thoroughly after cleaning 17 Turn on the power supply to start the automatic icemaking process B Maintenance This icemaker must be maintained individually referring to the instruction manual and labels provided with the icemaker A WARNING 1 Only qualified service technicians should attempt to service or maintain this icemaker 2 Disconnect power before performing service or maintenance 1 Stainless Steel Exterior To prevent corrosion wi
78. ronic 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 nitrogen gas 140 PSIG DO NOT use R 404A as a mixture with pressurized air for leak testing 15 Evacuate the system and charge it with refrigerant See the nameplate for the required refrigerant charge 16 Connect the flare connections 17 Close the drain valve s Open the condenser water supply line shut off valve If connected to a closed loop water supply also open the condenser return outlet shut off valve 18 Check for water leaks 58 19 Replace the panels in their correct positions 20 Turn on the power supply Adjustment of Water Regulating Valve water cooled model The 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 Prepare a thermometer to check the condenser drain temperature Attach a pressure gauge to the high side line of the system 2 Five minutes after a freeze cycle starts confirm that the thermometer reads 104 F to 115 F 40 C to 46 C If it does not rotate the adjustment screw by using a flat blade screwdriver until the temperature is in the proper range See Fig 10 Next check that the reference pressure is in the range indicated in the Head Pressure table See III C Perfor
79. s problem using 2 beeps every 3 seconds The freeze timer shuts down the icemaker if for two cycles in a row the freeze cycle takes longer than the time specified to complete The control board signals this problem using 3 beeps every 3 seconds The time is factory set using S1 dip switch 9 amp 10 For details see II C 3 f Freeze Timer S1 dip switch 9 amp 10 The ALARM RESET button on the control board must be pressed with power on to reset either of these safeties c High Temperature Safety The temperature of the suction line in the refrigeration circuit is limited by the high temperature safety This protects the unit from excessively high temperatures If the evaporator temperature reaches 127 F 7 F 53 C 4 C the control board reads a 8 kO signal from the thermistor and shuts down the icemaker The control board will 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 float switch at the end of the initial 1 minute fill cycle and at the end of each harvest cycle If the float switch is in the up position electrical circuit closed the control board changes to the next cycle If the float switch is in the down position electrical circuit open the control board changes to additional 1 minute fill cycles until water fills the tank and closes the float switch When the
80. s serviced Make sure that none have fallen into the dispenser unit storage bin Make sure all food zones in the icemaker and dispenser unit storage bin are clean after the unit is serviced For cleaning procedures see VI Cleaning and Maintenance A Diagnostic Procedure The diagnostic procedure is basically a sequence check which can be used at unit startup or for system diagnosis This procedure allows you to diagnose electrical system and component failures Before conducting the diagnostic procedure check for correct installation proper voltage per unit nameplate and adequate water supply Check CB using the steps in IV B Control Board Check Check the dip switch settings to assure that S1 dip switch 3 4 7 8 9 amp 10 and S2 dip switch 1 through 6 are in the factory default position S1 dip switch 1 2 5 amp 6 are cleaning adjustments and the settings are flexible For factory default settings see II C 3 a Default Dip Switch Settings As you go through the procedure check to assure the components energize and de energize correctly If not those components and controls are suspect To check voltages coming from the board a diagnostic connector is provided For details see III B 2 Diagnostic Connector To check voltages going to the compressor a compressor terminal block is provided For details see III B 3 Compressor Terminal Block 1 Turn off the power supply then access the control box Clear any ice
81. s the harvest cycle After 2 consecutive freeze timer terminations the control board shuts down the icemaker In this case see IV F 3 Low Ice Production for possible solutions The freeze timer is factory set and generally no adjustment is required Before changing this setting contact Hoshizaki Technical Support at 1 800 233 1940 for recommendations 1 Dip Switch Setting Time No 10 minutes 50 g Pump Out Drain Selector S2 dip switch 1 CAUTION Factory set for proper operation Do not adjust Adjustment outside of the factory default setting may result in damage to the icemaker The pump out drain selector setting determines whether the pump motor energizes pump out or stays off drain after a 2 second delay at the beginning of the pump out cycle or at shutdown Regardless of the pump out drain selector setting the drain valve energizes after a 2 second delay at the beginning of the pump out cycle or at shutdown When the pump out drain selector is set to pump out the pump motor takes water from the tank and forces it through the drain valve and down the drain When the pump out drain selector is set to drain water drains by gravity through the drain valve S2 Dip Switch Setting Pump Out Noi Drain 22 h Float Switch Selector S2 dip switch 2 CAUTION Do not adjust This must be left in the factory default position or the unit will not operate correctly The float switch selector allows for sin
82. t 20 d Pump Out Frequency Control S1 dip switch 5 amp 6 The pump out frequency control is factory set to drain the water tank every 10 cycles and generally no adjustment is required However if the icemaker needs a pump out more often due to local water conditions the pump out frequency can be adjusted The pump out frequency control can be set to have a pump out occur every cycle or every 2 5 or 10 cycles After startup the first pump out occurs after the 1st freeze cycle S1 Dip Switch Settin n e Harvest Pump Timer S1 dip switch 7 amp 8 CAUTION Factory set for proper operation Do not adjust Adjustment outside of the factory default setting may result in damage to the icemaker Depending on the harvest pump timer setting the pump motor energizes and runs for the last 0 10 30 or 50 seconds of harvest When the pump motor is on water circulates over the evaporator The water valve is energized during harvest for a maximum of 6 minutes or the length of harvest minus O 10 30 or 50 seconds determined by the harvest pump timer setting whichever is shorter S1 Dip Switch Setting Time seconds 21 f Freeze Timer S1 dip switch 9 amp 10 CAUTION Adjust to proper specification or the unit may not operate correctly The freeze timer setting determines the maximum allowed freeze time to prevent possible freeze up issues Upon termination of the freeze timer the control board initiate
83. t Switch Cleaning After cleaning the float switch check it again Replace if necessary 2 Float Switch Cleaning Depending on local water conditions scale may build up on the float switch Scale on the switch can cause the float to stick In this case the float switch should be cleaned 1 If you have not already done so remove the front panel and move the control switch to the SERVICE position Move the service switch to the DRAIN position Allow the water to drain from the tank then move the control switch to the OFF position 2 Turn off the power supply 3 Remove insulation panel A the large insulation panel in front of the evaporator Pump Motor by lifting up the panel slightly and pulling it 4 Connector towards you Float Switch 4 Remove the 2 thumbscrews securing Connector insulation panel B then remove insulation panel B See Fig 6 0 5 Disconnect the discharge hose Thumbscrews the drain valve drain hose and the o overflow drain hose Drain Valve 6 Disconnect the pump motor Discharge Drain Hose Overflow Insulation connector and the float switch Drain Hose pbanel B connector from the side of the control box Fig 6 39 7 Remove the 2 thumbscrews securing the pump motor and float switch assembly See Fig 7 8 Pull out the water tank cube guide and pump motor and float switch assembly together 9 Remove the screw securing the float switch to the top of the
84. ted Clean if necessary See IV C 2 b Mechanical Bin Control Cleaning If the bin control switch still reads closed replace the bin control 7 Reconnect the wire connector to the control board K1 nine pin connector then move the control switch to the ICE position Turn on the power supply 8 Check that the POWER OK LED on the control board is on not flashing 9 During the 1 minute fill cycle press the actuator in and hold it in for 15 seconds Check that the POWER OK LED flashes and after the actuator is held in for 15 seconds the water tank drains After the water tank drains and the float switch opens the unit should shut down If the unit does not shut down after the water tank drains check the float switch See IV D Float Switch Check and Cleaning If the float switch checks out and the unit will not shut down after the water tank drains replace the control board See V N Removal and Replacement of Control Board 2 Bin Control Cleaning Scale may build up on the bin control Scale can cause the actuator paddle to stick In this case the bin control should be cleaned A WARNING CHOKING HAZARD Ensure all components fasteners and thumbscrews are securely in place after the unit is serviced Make sure that none have fallen into the storage bin 1 Turn off the power supply 2 Remove the front panel then move the control switch to the OFF position 3 Clear any ice away from the bin control 37 4
85. the outer edge of the control board is 5 6 8 9 4 7 For details see II B Sequence of Operation i Ti LED Sequence Step LED Energized ime LEDs are On Components Min Avg 1 Minute Fill Cycle Harvest Cycle 5 6 8 Comp FMR HGV WV 2 minutes 20 minutes 3 to 5 minutes Comp FMR HGV PM 10 seconds 50 seconds harvest pump timer setting Freeze Cycle 5 7 Comp FM FMR PM 5 minutes freeze timer 130 to 35 minutes LLV setting Pump Out Cycle 5 6 4 7 Comp FMR HGV DV 110 seconds 120 seconds pump out drain PM selector setting The built in safeties shut down the unit and have alarms as listed below No of Beeps 1 High Evaporator Temp Check for harvest problem stuck HGV or relay hot temperature gt 127 F water entering unit stuck HM or shorted thermistor 53 C 2 Harvest Backup Timer Check for open thermistor HGV not opening TXV or harvest gt 20 min for two cycles LLV leaking by low charge inefficient Comp or WRV in a row leaking by 3 Freeze Timer Check for F S stuck closed up WV leaking by HGV freeze gt freeze timer setting for leaking by PM not pumping TXV not feeding properly two cycles in a row LLV not opening low charge HM not bypassing or inefficient Comp To reset the above safeties press the ALARM RESET button with the power supply on i Low Voltage POWER OK LED turns off if voltage protection 92Vac 5 or less operates High Voltage The contr
86. to move the control switch to the OFF position When storing the icemaker for an extended time or in sub freezing temperatures follow the instructions below 1 Remove the water from the icemaker water supply line 1 Turn off the power supply then remove the front panel 2 Move the control switch on the control box to the OFF position 3 Close the icemaker water supply line shut off valve then open the icemaker water supply line drain valve 4 Allow the line to drain by gravity 5 Attach compressed air or carbon dioxide supply to the icemaker water supply line drain valve 6 Move the control switch to the ICE position 7 Replace the front panel in its correct position then turn on the power supply 8 Blow the icemaker water supply line out using compressed air or carbon dioxide 2 Drain the water tank 1 2 Turn off the power supply then remove the front panel Move the service switch to the DRAIN position then move the control switch to the SERVICE position 3 Replace the front panel in its correct position then turn on the power supply for 2 minutes 4 5 6 7 Turn off the power supply then remove the front panel Move the control switch to the OFF position Replace the front panel in its correct position SFE Remove all ice from the dispenser unit storage bin Clean the dispenser unit storage bin using a neutral cleaner Rinse thoroughly after cleaning 8 Close the

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