Automatic Ice maker
Contents
1. 1 Clean the icemaking section per the instructions below Cleaning should be performed a minimum of every 6 months Local water conditions may require that cleaning be performed more often 2 Check ice bridge thickness Proper thickness should be 1 16 1 8 3 Check water level in trough See troubleshooting for proper water level and adjustment 4 Clean the condenser to insure unobstructed air flow 5 Check for leaks of any kind Water Refrigerant Oil Etc 6 Check the bin switch for proper adjustment 7 Check all electrical connections 8 Oil the fan motor if the motor has an oil fitting Cleaning and Sanitizing Harvest problems may occur if the following procedures are not performed every 6 months 1 Remove the ice machine front panel 2 Make sure that all the ice is off of the evaporator If ice is being made wait for cycle completion then turn the machine OFF at the selector switch 3 Remove or melt all ice in the storage bin 4 Add recommended amount of approved ice machine cleaner to the water trough according to label instructions on the container 5 Initiate the clean cycle at the controller board switch by turning on the machine and activating the switch marked as CLEAN Note This must be done within 3 minutes of turning the machine ON Allow the cleaner to circulate for approximately 15 minutes to remove mineral deposits 6 After 15 minutes or 30 minutes automatically stop the proce2. returning to the trough At the end of freeze cycle and during harvest the water dump valve is opened and the mineral laden remaining water is pumped down the drain Wiring Connection Circuit Diagram EVAP SENSOR Drain valve NAN AS FAN MOTOR Valve ee COND SENSOR WATER PUMP FAN motor ki PUMP O HOT GAS ICE FULL SENSOR o A AAA VALVE E oe C OVERLOAD PCB CEAN Switch socke COMP H kefil ty QS of J I clean Ub COMPRESSOR Ice making I l MODE at RELAY f 1 z F e LJ N e Ice harvest power LED STARTING hi ki LED O CAPACITOR HSVT CONTROL PANEL 60Hz FUSE e POWER SWITCH TRANSFORMER Circuit Description 1 Electrify Status For The First Time As the icemaker is properly installed switch on the water tap let the water trough full reach on the level then turn the Power switch to the ON position on the back panel The icemaker will start working automatically In this status the time is fixed about 3 minutes This function is also helpful to protect the compressor avoiding restart within 3 minutes At this status the White Green Yellow an
3. Code English Description 2 1864802401 Water trough 3 1880001701 Floater valve 4 1864600404 Water curtain 6 1858904400 Water pump 8 1880025700 Evaporator 9 1880002401 Water distributor tube 14 1854000600 Power switch 17 1854201200 Button control panel 19 1854202300 Main control panel 19 1 1854800300 Fuse 19 2 1851700700 Temperature sensor of condenser 19 3 1851700501 Temperature sensor of evaporator 20 1858442400 Transformer 24 1854700800 Drain valve 28 1854601900 Expansive valve 29 1 1854704410 Hot gas valve body 29 2 1854702700 Hot gas valve coil 30 1853107600 Wiring harness 31 1861530802 Water outlet connector 32 1864526600 Water inlet connector 36 1880014001 Condenser 38 1880008300 Drier 41 1 1858421200 Compressor 41 2 1858441400 Srarting device component 41 3 1858451300 Protector 45 1 1858203800 Condenser fan motor 45 2 1858441500 Fan motor capacitor 6uf 49 1871018500 Microswitch 28
4. K Evaporator Gets Hot Installed correctly Gl Is water temp proper Correct installation G2 Is purge valve leaking Replace valve Is Hot Gas Valve OK Are sensors connected to Board Tighten spade connections Is the Controller OK Thermal Expansion Valve Replace oo y O H Machine Does Not Enter Harvest H7 Isthe board defective Replace S I Machine Harvests but returns to Ice Making prematurel Is the manual purge Open B RelayOK Replace J Length of Harvest Excessive Machine installed correctly Is ice formed correctly Low charge recharge valve directions J5 _ Isthe ice bridge correct s Machine Level Does water run over evaporator Clean J11 during harvest J8 Is Purge valve leaking Replc 414 4 J10 IsselectorswitthOK Replace J12 Discharge pressure low during Ambient temp too Replace Hot Gas Valve freeze low K Evaporator Gets Hot Installed correctly replace motor loose connections Is machine charged correctly Is controller operating correctly Replace Hot Gas Replace controller board Valve L The Compressor Does Not Start or Starts Frequent 12 _ Has the fan stopped oris dirty RepaitiClean I3 H controller connections components OK 15 __ Is the controller board OK Is the compressor OK po Replace I M Compressor Runs but no ice produced Step Cheek Ws No CA Tis h
5. adjustment Exploding Drawing oo oo OF JO 30 04 53 Si al 00 29 2452 26 so 24 29 22 ITEM DESCRIPTION NO 1 front panel 2 inner front panel 3 Ice full probe 4 inner foam front panel 5 Ice full sensor 6 evaporator 7 water trough 8 front inner right panel 9 back inner right panel 10 right panel 11 Floater valve 12 support 13 fan motor capacitor 6uf 14 Condenser fan motor 15 fan motor support 16 Water inlet pipe 17 Water outlet pipe screw 18 water outlet pipe screw 19 Water inlet connector 20 foaming PE 21 top panel 22 compressor starting device component 23 compressor 24 discharge pipel 25 suction pipe 26 condenser and filtrate 27 T shape three ways 28 hot gas valve body 29 Cu Three ways 30 Has gas valve coil 31 hot gas pipe 32 Condenser sensor line 33 hot gas pipe 34 discharge pipe2 35 Expansive valve 36 drier 37 protect line cord 38 access cover 39 back panel 40 Power switch 41 Wiring harness 42 Control box 43 15A fuse 13 44 Control box upper support 45 control box lower support 46 left back panel 47 left front panel 48 compressor base 49 left panel 50 knob 51 compressor base support 52 Water distributor tube 53 Water out of pu
6. evaporator If the coil is separated the evaporator must be replaced If the outlet s of the evaporator is not frosted the problem is not with coil separation refer to Troubleshooting Note Permanent discoloration of the evaporator plating is normal and will cause no problems with harvesting the ice or sanitary conditions Before condemning the evaporator for plating problems be certain it is not just discoloration Good evaporators will not be covered under warranty If the spillway plastic evaporator top becomes damaged it can be replaced It is not necessary to replace the entire evaporator As liquid refrigerant leaves the evaporator it changes to a lowpressure gas before returning to the compressor Liquid refrigerant must not return to the compressor or damage will result Frost on the suction line at the inlet of the compressor indicates liquid returning to the compressor Check for frost at the end of the freeze cycle If liquid is returning to the compressor the problem must be located and corrected See Refrigerant Charge Thermostatic Valve and Evaporator Refrigerant Refrigerant in a highpressure liquid form is fed to an expansion valve where the refrigerant is reduced to a lowpressure liquid Under this low pressure the liquid will absorb heat from the evaporator causing the liquid to change to a vapor This vapor is the drawn into the compressor 25 where the temperature and pressure of the vapor are increased The high tem
7. full of ice the splash curtain is held open when ice drops off of the evaporator This releases the pressure of the bin switch actuator arm allowing the switch to open Undercounter and machines without curtains An ice slide at the bottom of the evaporator is used on all undercounter and some modular units The slideway swivels up and down and has a magnetic reed switch which detects its position When ice is sitting on the control the slideway faces down indicating that ice is present and disconnecting the circuit from the reed switch When the ice is removed the slideway swivels up and the connection is completed allowing the machine to begin producing ice again Bin Control Adjustment All Models except those without curtains Check the bin switch for proper adjustment by swinging the bottom of the curtain away from the evaporator Slowly bring the curtain towards the evaporator The switch should close when the bottom edge of the curtain is even with the outer edge of the water trough Adjust the switch by loosening the screws the hold the switch in place Move the switch to the proper position and retighten the screws Recheck the adjustment Adjustments are not ncovered under warranty Undercounter Models or Those Without Curtains There are no adjustments needed for the bin magnetic reed switch 27 Spare parts list Material Item No
8. Automatic Ice maker Service manual MIM452 MIM600 MIM1000 Table of contents Installation Guidelines 3 How the Ice Maker Works 4 Water System 7 Wiring Connections and Controller 9 Exploding Drawing 12 TroubleShooting 14 Before Maintenance 14 Basic Checking 14 TroubleshootingGuide 15 Adjustment and Replacement 20 Advanced component troubleshooting techniques 21 Spare parts list 28 Installation Guidelines Note Installation should be performed by a trained Service Technician For proper operation of the ice machine the following installation guidelines must be followed Failure to do so may result in loss of production capacity premature part failures and may void all warranties Ambient Opera
9. The run capacitor is an electrical storage device used to improve the running characteristics and efficiency of the compressor Before checking a capacitor it should be discharged by shorting across the terminals If a run or start capacitor is cracked leaking or bulging it should be replaced If a capacitor is suspected of being defective it can easily be checked by replacing it with a capacitor of the correct size which is known to be good If the compressor starts and runs properly replace the original capacitor A capacitor tester can also be used Start Relay The start relay breaks the electrical circuit to the start windings when the compressor motor speed increases If the relay is defective the compressor will not start or it may start but will run for a very short time A compressor relay can be checked by removing the relay and checking the relay contacts for damage and check for continuity across the closed relay points Check the relay coil with an ohmmeter If no continuity is read replace the relay Other Components 23 Thermostatic Expansion Valve TXV The thermostatic expansion valve meters the flow of refrigerant into the evaporator changing its state from a highpressure liquid to a lowpressure liquid This drop in pressure causes the refrigerant to cool The cooled refrigerant absorbs heat from the water circulating over the evaporator As the evaporator fills with liquid refrigerant the evaporator becomes colder The
10. all functional parts fasteners thermostat bulbs if used etc are in place 12 After 3 minutes stop the process and drain the sump Refill with clean water run another 5 minutes and drain again Fill the trough with fresh incoming water 13 Place the switch to the ON position and replace or close the panel Discard the first two ice harvests How the Ice Maker Works Refer to the Operation section of the User s Manual pages 12 to 14 for a clear description of how the ice maker makes ice and uses water There are 3 systems the Cooling System the Water System and the Electrical System Cooling System ITEM NO DESCRIPTION 1 Compressor 2 Discharge tube 3 Cu three ways 4 Condenser 5 Drier and filter 6 Capillary tube 7 Connection tube 8 Hot gas valve 9 Hot gas tube 10 Evaporator Ice Mold 11 Fan blade 9 200X28 12 Suction pipe 13 Motor 5W 14 Motor 10W 15 Temperature sensor of the evaporator 16 Temperature sensor of the condenser 17 Controller During the icemaking stage the hot gas solenoid valve is closed The hot refrigerant gas is pumped out of the compressor to the condenser The hot gas is cooled by fanforced air to cool the liquid refrigerant after passing through the condenser The drier and filter reduce possible dirt and moisture in the refrigerant The refrigerant expands in the evaporator cooling it s
11. alled Correctly Check Refrigeration system D3 Condenser Clean Check Refrigeration Clean system E Cubes are Hollow Water leaking from purge Is the evaporator sensor wire tight Tighten spade connection to board Is the controller OK po Replace O F Bridge Thickness is Uneven Is water temp above 100 deg F F2 Water running into bin Ck C D E or examine F3 trough for leak Water leaking from purge Replace Valve F4 Suction pressure High Examine Hot Gas Recharge and or examine Valve TXV G Bridge Thickness Varies with Each Cycle Yes 17 Gl Is water temp proper Correct installation G2 Is purge valve leaking Replace valve Is Hot Gas Valve OK Are sensors connected to Board Tighten spade connections Is the Controller OK Thermal Expansion Valve Replace oo y O H Machine Does Not Enter Harvest H7 Isthe board defective Replace S I Machine Harvests but returns to Ice Making prematurel Is the manual purge Open B RelayOK Replace J Length of Harvest Excessive Machine installed correctly Is ice formed correctly Low charge recharge valve directions J5 _ Isthe ice bridge correct s Machine Level Does water run over evaporator Clean J11 during harvest J8 Is Purge valve leaking Replc 414 4 J10 IsselectorswitthOK Replace J12 Discharge pressure low during Ambient temp too Replace Hot Gas Valve freeze low
12. atus the pump is powered on Compressor motor fan and are powered off The GREEN and YOLLOW LEDs are flashing together To stop the cleaning mode turn the machine OFF at the Power switch or it will turned off automatically after 30 minutes NOTE In order to start the Clean Status the power switch must be on The CLEAN switch must be turned in 3 before the COMPRESSOR starts To clean it is no use turning the CLEAN switch when machine is in ice making status or ice harvest status Controller box Instructions for LEDs and buttons 1 White LED Ice full indicator light When this LED is lit the ice storage bin is full of ice or there is something between the ice full sensor and the evaporator The unit will stop making ice When ice cubes are taken out of the ice storage bin making the ice full probe free the white LED will keep flashing for 3 minutes Then the unit will restart and return to the ice making mode 2 Green LED Ice making indicator light When this LED is lit the unit is working in the ice making mode controlled by a temperature probe on the evaporator When the green LED is flashing the unit is working in the ice making mode controlled by a fixed timer 3 Yellow LED Ice harvest indicator light When this LED is lit the unit is working in the ice harvest mode controlled by ice full probe 10 When green LED and yellow LED is lit it means the unit is working in the cold preservation stage 4 Red LED powe
13. bulb is not making good contact with the suction line the flow of refrigerant into the evaporator will be too great and liquid refrigerant will flood the compressor The suction pressure will remain higher than normal and the machine will remain in an extended freeze cycle Ice will build evenly but will be very thick Symptom Evaporator cold but suction pressure not dropping Compressor has been checked and appears to be good Suction line at compressor may be colder than normal Problem 1 TXV thermal bulb not making good contact with suction line or uninsulated Possible Correction 1 Tighten bulb clamp and or insulate bulb 2 TXV bulb installed incorrect 3 System overcharged 4 TXV stuck open 2 Locate bulb on top of suction line 3 Recharge system 4 Replace TXV Evaporator starved no frost on line s exiting evaporator Suction pressure is low Hot Gas Valve 1 Machine low on charge 1 Recover refrigerant and weigh in proper charge 2TXV restricted or stuck closed 2 Replace TXV and drier When the machine enters harvest the hot gas valve coil is energized opening the hot gas valve Discharge gas is pumped through the hot gas valve directly into the evaporator The evaporator temperature will reach approximately 40 F 4 5 C The suction pressure during harvest should be a minimum of 70 psi 4 8 bar for R404a units or 50psi 3 4 bar for R134a units The discharge pressure will drop during harv
14. d Red LEDs are light together 2 Ice making Status The compressor motor fan and pump are powered on The hot gas solenoid valve is powered off When this green LED is lit the unit is working in the ice making mode controlled by a temperature probe on the evaporator When the green LED is flashing the unit is working in the ice making mode controlled by a fixed timer The fan motor is also controlled by a condenser sensor When the ambient temperature is too lower the motor fan stop working for good condensation to refrigerant 3 Ice Harvest Status The pump is powered off The hot gas solenoid valve compressor and motor fan is powered on The fan motor is also controlled by a condenser sensor When the ambient temperature is too lower the motor fan stop working for good condensation to refrigerant The Yellow LED indicates the ice harvest status 4 Ice Full Status And Cold Preservation Stage If the ice bin is fulfilled with ice the machine stops making ice and turn to cold preservation stage automatically In this status the compressor works regularly to keep the lower temperature for lower ice melting The rest of the electric components are powered off The WHITE LED indicates the ice full status and the GREEN AND YELLOW LEDs together indicates the cold preservation status 5 Cleaning Status Turn the machine CLEAN SWITCH at the CLEAN in 3 minutes after the POWER SWITCH is turned on the machine turn to Cleaning Status At this st
15. d to be replaced Check for continuity from each terminal to the compressor body if continuity is found from any terminal to the compressor body the compressor windings are shorted to ground and the compressor will need to be replaced If the compressor appears to be good at this point it is advisable to use a compressor analyzer to isolate the compressor from the start components while checking for a locked rotor If an analyzer is not available the compressor starting components must be checked If all starting components are good check the amperage draw from the common terminal of the compressor making sure proper voltage is supplied to the compressor and all wiring is properly connected If the compressor does not start and there is excessive amperage draw see locked rotor amps on compressor tag the compressor has a locked rotor and should be replaced Overload External If there is no amperage draw check the compressor overload The compressor overload can be checked for continuity after removing it from the compressor and letting it cool to room temperature If there is no continuity between the two terminals replace the overload If the overload is suspected of opening prematurely it should be replaced with an overload which is known to be good Capacitors The start capacitor is an electrical storage device used to provide starting torque to the compressor If a start capacitor is defective the compressor will not start properly
16. eeondeser diny cm w Is there a leak Add valve recover M5 refrigerant fix and charge replace filter Is the TXV or cap tube operating M6 Add valve recover normally refrigerant fik and charge replace filter M6 Does the ice making mode convert Replace controller board to harvest ene Makes Excessive Noise Step Check Ves TN Ct Resta oe Tiras N2 N3 N4 Is the pump noisy N6 Is there an object in the impeller Replace Pump N6 Is the copper tubing inside the Bend away from each N6 machine rubbing other Is the noise from the compressor Replace compressor 1 Adjustment and Replacement Replace Control box fuse and the sensor of temperature WARNING Disconnect Electrical Power Before l ELECTRICAL SHOCK HAZARD 2 Beginning Removal of Parts Replacing Control Box Fuse and Temperature Sensor Remove the rear cover and the louvered front panel or the side panel on a modular unit Locate the electronic control box in the unit Carefully pull out the temperature sensors one at the evaporator another at the condenser Loosen the screws holding the control box replace with a new one Reverse the foregoing steps to reassemble Jf you need to replace the fuse open the front panel of the control box and you will find this figure If you need to replace a temperature sensor pull out the sensor open the panel of the co
17. est If the hot gas valve does not completely open during harvest there will not be enough hot gas in the evaporator to defrost the ice If there is not enough hot gas entering the evaporator the suction pressure will be lower than the above stated pressures It is important when making this check that the machine has the proper refrigerant charge normal head pressure and the compressor is 24 functioning properly If the hot gas valve leaks during the freeze cycle ice will not form on the top of the evaporator and suction pressure will be higher than normal To check if the hot gas valve is leaking let the machine run in the freeze cycle for approximately 5 minutes Now feel the temperature between the inlet and outlet of the valve A definite temperature difference should be felt If the lines are the same temperature and the suction pressure is higher than normal the valve is leaking and should be replaced Symptom Problem Possible Correction Evaporator remains cold during 1 Refrigerant charge too low 1 Recharge system defrost and suction pressure is 2 Hot Gas Valve does not open 2 Replace Hot Gas Valve low Suction line at compressor completely may be colder than normal Evaporator has ice at the top 1 Compressor failing 1 Check and replace if temperature at inlet and outlet necessary of the valve is the same 2 Hot Gas Valve Leaking 2 Replace Hot Gas Valve Evaporator As water is circulated over the front of the evap
18. flow of refrigerant into the evaporator is controlled by the temperature at the outlet of the evaporator The expansion valve bulb mounted to the top of the suction line senses the evaporator outlet temperature causing the expansion valve to open or close As ice forms on the evaporator the temperature drops and the flow of refrigerant into the evaporator decreases resulting in a drop in suction pressure The evaporator should become completely flooded filled with liquid refrigerant during the freeze cycle A completely flooded evaporator will have a uniform freeze pattern ice formation across the evaporator A starved evaporator not enough liquid refrigerant will have poor or no ice formation at the top of the evaporator and the tube s exiting the evaporator will not frost All tubes should be frosted approximately 5 minutes from the start of the freeze cycle An expansion valve that is restricted or not opening properly will starve the evaporator resulting in lower than normal suction pressure A low refrigerant charge will also starve the evaporator and cause low suction and discharge pressures If not sure of the amount of charge in the system the refrigerant should be recovered and the correct charge be weighed in before a defective valve can be diagnosed If the evaporator is starved but the suction pressure is higher than normal the TXV is not the problem refer to the troubleshooting section If the TXV sticks open or if the thermal
19. h the timer is initiated is adjustable as is outlined below Adjustments Ice size adjust 1 Press and hold the Clean button and the Mode button together for at least 3 seconds The unit will enter the Ice Size Adjustment mode The ICE LED green will be blinking continuously during the ice size adjustment 2 While in the Ice Size Adjustment mode press the Clean button or the Mode button for the desired ice size Smaller ice setting By pressing the Clean button you can decrease the size of the ice cubes The FULL LED red will flash as you lower the ice size and will finally be blinking at the setting of smallest ice size Larger ice setting By pressing the Mode button you can increase the size of the ice cubes The HARVEST LED yellow will flash as the larger size is set and will blink when the setting of largest ice size has been reached After 10 seconds without any operation the unit will automatically memorize the current state and return to the previous mode HL J L Bridge Thickness 26 Bin Control Operation The bin control is used to shut the machine off when the bin fills with ice The bin control must be checked upon installation or initial startup and when performing maintenance Adjustments are notcovered under warranty There is one bin switch for each evaporator The actuator arm of the bin switch comes in contact with the splash curtain When the bin is
20. mp 54 water pump support 55 Water pump 56 Drain pipe 57 Drain pipe connector 58 Drain pipe hex nut 59 Drain pipe stopple 60 Drain pipe screw 6l Evaporator sensor line Troubleshooting WARNING ELECTRICAL SHOCK HAZARD Disconnect Electrical Power Before Beginning Removal of Parts Before Maintenance 1 Be sure the electrical supply is 115 VAC 60Hz 15A and is properly grounded to protect maintenance personnel against electrical shock 2 Are any electrical leads loose Danger of short circuit If so disconnect power Basic Troubleshooting Some problems can be pinpointed through the service technician s senses of hearing sight and touch Examples are listed below Listen Listen to the user s description of how the ice maker was operating especially the depiction of unusual phenomena Ask how the unit was operating before the user called for service and try to deduce the defect from the comments Does the machine sound normal when it is running like a window air conditioner Look Check the cooling system tubing especially the welded joints If some oil can be seen the gas may be leaking resulting in less than the normal amount of ice is being produced Is the cycle of the icemaking and ice harvesting normal Does water run is the fan running and is the evaporator getting cold enough Check the water system especially at the connections Are there any water leaks Check the flow of
21. ntrol box pull out the other end of the sensor replace with a new one Reverse these steps to reassemble Replacing the water pump Disconnect electrical power Remove the front cover Unplug the lines connected with the water pump including the water outlet tube of the pump Loosen the screws Replace the pump with a new one Reverse the above steps to reassemble Replacing the cooling system components To replace the condensing components see the Cooling System figure 1 Replacing the compressor and the compressor kit MORAS hia thermal protect If only the compressor kit needs to be replaced remove the top panel and left panel locate the compressor take off the clip replace the defective components Reverse the above steps to reassemble ELECTRICAL SHOCK HAZARD Disconnect electrical power before beginning removal of parts Condenser AA High Pressure Gas ININ High Pressure Liquid CIN Low Pressure Gas EEE Low Pressure Liquid Filter Drier If the compressor needs to be replaced remove the top cover and locate the compressor Unplug lines and remove ground line open the Process Suction evacuate refrigerant take out compressor replace with a new one join together then recover refrigerant weigh in the charge on the nameplate Reverse the above steps to reassemble 2 Replacing the fan motor and fan blade Remove the top and right panels Locate the fan motor un
22. o ice will form while in the presence of water Low pressure refrigerant gas returns to the compressor from the evaporator where the cycle continues During the ice harvest stage the solenoid valve is open The hot refrigerant gas is pumped out of the compressor to the evaporator through the hot gas valve As the hot gas is not cooled by the condenser the refrigerant warms the evaporator Ice in contact with the evaporator begins to melt on the back side The ice gradually ice slides off of the evaporator and drops to the storage bin Water System When the water inlet is connected with the main water supply water will fill the trough through the ITEM NO DESCRIPTION 1 Water supply pipe 2 Water inlet connector 3 Nut of water inlet tube 4 Supporting tube 5 Water pump inlet tube 6 Nut of water inlet tube 7 Floater valve 8 Water trough 9 Water pump 10 Water pump outlet tube 11 Water distribution tube 12 Evaporator Ice Mold 13 Ice full sensor 14 Drain pipe connector 15 Drain pipe hex nut 16 Drain pipe 17 Drain pipe screw 18 Drain pipe stopple 19 Ice slideway 7 float valve until the water level in the trough closes the valve During the icemaking stage water is pumped from the water trough to the water distribution tube The distributed water flows over the surface of the cold evaporator where the purest water is converted to ice The unfrozen water
23. orator liquid refrigerant is circulated through the tubing attached to the back of the evaporator As the liquid refrigerant in the tubing vaporizes it absorbs heat from the water causing the water to freeze The evaporator should be completely flooded throughout most of the freeze cycle A flooded evaporator will build ice evenly across the evaporator A starved evaporator will have thick ice at the bottom and thin ice at the top Most problems with ice formation or harvesting are not related to a defective evaporator If the evaporator is flooded but not building ice evenly it is possible the evaporator has coil separation Evaporator coil separation is the separation of the refrigerant tubing from the back of the evaporator plate This is very rare but occasionally occurs The symptoms of coil separation are low suction pressure ice not releasing from the evaporator during harvest and hollow cubes or uneven ice bridge on some areas of the evaporator If coil separation is suspected let the machine run in freeze until the timer has energized Check the evaporator for areas where cubes are less developed than cubes in other areas If the cubes are all the same size coil separation is not the problem If there are areas other than the top row with less developed cubes check the refrigerant lines at the inlet s and outlet s of the evaporator if both lines are frosted the coil is separated To confirm coil separation remove and check the back of the
24. perature high pressure vapor flows to the condenser where the heat is removed causing the vapor to return to the liquid form making the refrigerant ready to flow back to the evaporator to pick up more heat ice machine use R134a or R404a refrigerant Always check the serial number data plate for the proper type of refrigerant and the amount used in the machine you are servicing R404a and R134a are both HFC refrigerants which result in no ozone depletion factor R404a cylinders are orange in color R134a cylinders are light blue in color Do not switch refrigerants in the machine Important When discharging refrigerant from an icemaker recover as much of the refrigerant as possible with a recovery device or some other means to prevent the refrigerant from entering the atmosphere Electronics and Sensors Control Board Checks Timer Initiate The timer initiate is a temperature sensor mounted on the liquid line to the evaporator When the sensor detects the correct low temperature the freeze timer is energized and the machine enters the timed portion of the freeze cycle When the freeze timer is energized the machine is in the timed portion of the freeze cycle When the machine enters harvest the temperature rises but the amount of time the machine is in harvest is predetermined and is controlled by the Controller Board Once the time has passed the machine will enter the harvest cycle The timer is not adjustable but the temperature at whic
25. plug the lines connected with the fan motor loosen the screws of the holding bracket and fan motor bracket remove the damaged unit and replace with a new one Reverse the above steps to reassemble 21 3 Replacing the hot gas valve drier and evaporator Remove the top panel Locate the drier and hot gas valve open weld replace the drier and hot gas valve weld recover refrigerant evacuate and weigh in the charge on the nameplate Reverse the above steps to reassemble If needed replace the evaporator Remove the front and top panels locate the evaporator open the Process Suction open the two welds replace with a new evaporator Recover refrigerant evacuate and weigh in the charge on the nameplate Reverse the above steps to reassemble ADVANCED COMPONENT TROUBLESHOOTING TECHNIQUES Refrigeration System Refrigerant Cycle and Components Before diagnosing the refrigeration system it is very important that the refrigeration charge be correct Whenever the refrigeration system has been opened the filterdrier must be replaced and the proper refrigerant charge must be weighed in Refrigerant Pressures The suction pressure at the beginning of the freeze cycle can vary 10 psi 7 bar depending on operating conditions Pressures less than this may indicate an undercharge The discharge pressure on air cooled units will vary with ambient conditions Refrigerant in a gas state is pumped throughout the refrigeration
26. portant to use the troubleshooting charts when diagnosing a problem The air condenser is located in the back of the cabinet Air is pulled through the condenser by a fan motor and discharged through the right hand side panel The Undercounter air intake and discharge is through the front panel Do not block airflow as it will cause premature failure of the machine and will void the warranty 22 Compressor Check Compressor and Start Components The compressor should run during the entire cycle If the machine is in the ON position but the compressor is not running check the compressor contactor to see if it is engaged If the contactor is not engaged the problem is not with the compressor or the compressor start components If the contactor is engaged and there is correct voltage through the contactor there could be a problem with one of the starting components or the compressor It is recommended that the compressor starting components be replaced when replacing a compressor DISCONNECT POWER BEFORE SERVICING If the compressor uses an internal overload be certain that the compressor has cooled and the overload has reset before diagnosing the compressor If the compressor is cool and is still not running check the compressor motor windings by first removing the wires at the compressor terminals With an ohmmeter check for continuity between all three terminals if an open circuit exists between any of the terminals the compressor may nee
27. r indicator light The power is on when the red LED is lit 5 Mode button Mainly for service When this button is pressed it can change from ice making mode to ice harvest mode or from ice harvest mode to ice making mode You can judge the mode from the status of the green and yellow LEDs 6 Ice size adjust 1 Press and hold the Clean button and the Mode button together for at least 3 seconds The unit will enter the Ice Size Adjustment mode The ICE LED green will be blinking continuously during the ice size adjustment 2 While in the Ice Size Adjustment mode press the Clean button or the Mode button for the desired ice size Smaller ice setting By pressing the Clean button you can decrease the size of the ice cubes The FULL LED red will flash as you lower the ice size and will finally be blinking at the setting of smallest ice size Larger ice setting By pressing the Mode button you can increase the size of the ice cubes The HARVEST LED yellow will flash as the larger size is set and will blink when the setting of largest ice size has been reached After 10 seconds without any operation the unit will automatically memorize the current state and return to the previous mode NOTE If during the ice size adjustment the BIN FULL ICE and HARVEST LEDS blink all at once this indicates that the unit is in the default factory setting of the ice size
28. ss and drain the sump Refill with clean water run another 5 minutes and drain again Hill the trough with fresh incoming water 7 Terminate the wash cycle at the switch by placing the switch in the OFF position Remove the splash curtain if available and inspect the evaporator and water spillway the plastic top of the evaporator to assure all mineral residue has been removed 8 If necessary wipe the evaporator spillway and other water transport surfaces with a clean soft cloth to remove any remaining residue If necessary remove the water distribution tube disassemble and clean with a bottlebrush Reassemble all components and repeat steps 4 through 7 as required to remove residue 9 Turn OFF ice machine water supply and clean the water trough thoroughly to remove all scale or slime buildup If necessary remove the water trough to reach all splash areas and float 10 Prepare 1 to 2 gallons 5 7 to 7 5 liters of approved EPA FDA sodium hypochloride food equipment sanitizer to form a solution with 100 to 200 ppm free chlorine yield 11 Add enough sanitizing solution to fill the water trough to overflowing and activate the switch to the CLEAN position and allow circulation to occur for 10 minutes and inspect all disassembled fittings for leaks During this time wipe down all other ice machine splash areas plus the interior surfaces of the bin deflector and door with the remaining sanitizing solution Inspect to insure that
29. system by a hermetic compressor to the condenser Heat is removed from the refrigerant either by forced air movement through an aircooled condenser or transferring heat from the refrigerant to water through a watercooled condenser The refrigerant changes to a liquid when cooled The refrigerant in a liquid state passes through a filter drier The filter drier traps small amounts of moisture and foreign particles from the system The filter drier must be replace whenever the refrigeration system is opened or if the refrigerant has been completely lost Compressor The compressor runs during the entire cycle If the valves in the compressor are damaged the compressor will be unable to pump refrigerant efficiently Damaged valves may be the result of another problem in the refrigeration system such as liquid refrigerant returning to the compressor or high head pressure When a compressor is replaced it is important that the refrigeration charge be weighed in and the system checked for proper operation to prevent a repeat failure An inefficient compressor will usually have a higher than normal suction pressure at the end of the cycle The freeze cycle will be longer than normal and or the harvest cycle may be excessively long Check the compressor amperage draw 5 minutes into the freeze cycle If the amp draw is less than 70 of rated full load amps the compressor may be inefficient These symptoms may also be caused by other problems therefore it is im
30. ting Temperatures Minimum Operating Temperature 50 F 10 C Maximum Operating Temperature 100 F 38 C Note These products are not designed for outdoor installation Incoming Water Supply Minimum incoming water temperature 40 F 5 C Maximum incoming water temperature 90 F 32 C Minimum incoming water pressure 15 psig Maximum incoming water pressure 80 psig Note If water pressure exceeds 80 psig a water pressure regulator must be installed Drains Route bin drain purge drain and water condenser drain individually to a floor drain The use of condensate pumps for draining water on equipment producing over 200 Ibs day is not recommended by Manufactor We assumes no responsibility for improperly installed equipment Water Filtration A water filter system should be installed with the ice machine Clearance Requirements Self contained air cooled ice machines must have a minimum of 6 inches 15cm of clearance at the rear top and sides of the ice machine for proper air circulation Since undercounter machines breathe from the front top and side clearances are minimal Stacking If the ice machines are to be stacked refer to the instructions in the stacking kit We does not endorse stacking aircooled ice machines Dispenser Application A thermostatic bin control kit must be installed if the ice machine is placed on a dispenser A bin top may or may not be required Ice Maker Maintenance Maintenance Procedure
31. water through the water filter and if not replace the water filter Check if the ice maker was installed according to the user s manual level and air space Inspect the ice maker to see if it needs to be cleaned Please note cleaning a dirty ice maker is not a warranty repair Feel Touch the tubing at the evaporation weld feeling the temperature During the icemaking stage it should feel cold During the ice harvest stage it should feel hot If appropriate touch the capillary tube or TXV tubing near the drier It should feel warm during the ice making stage Troubleshooting Guide This troubleshooting guide in the user manual should be read before this guide Be sure only when the trouble shooting in user manual can t help you solve the problem turn to this guide Troubleshooting Guide A Machine Does Not Run AG Isselectorswitchout Replace B Machine Runs Does Not Ice Bas compressor running Bo B Power to SSmpresabr Check for bad contactor or san empeno start components Is switch defective BS Water leaking from trough Repair leak Is refrigerant pressure High Clean condenser Check HGV Is refrigerant pressure Low Check for Leak po Weigh in new ees eee TXV defective C Machine Produces Cloudy Ice or Incomplete Cubes C2 Machine Level Incoming water Level quality poor Water Pump OK Replace Repair pump spillwa D Cube Size Good But Slow Production Inst
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