SCE275 - Scotsman Ice Systems
Contents
1. Problem or Symptom Possible Cause Probable Correction Fan motor s do not turn Open motor windings or seized bearings or blade stuck against shroud Replace fan motor or free fan blade No power to fan motors Fan motor unplugged check for voltage at controller Controller cycles fan motors during freeze If no voltage to the fan motors at controller during freeze replace controller Pump motor does not turn Open motor windings or seized bearings Replace pump No power to pump Check electrical connections Check water level Switch the unit to Clean the pump should then have power to it If not replace the AutolQ Controller Hot Gas Valve does not open Open solenoid coil Replace hot gas valve Stuck valve Replace hot gas valve No power to coil in Harvest Check wire connections if ok replace AutolQ Controller Hot Gas Valve leaks thru warm tube temperatures on both sides of valve during freeze Mechanical problem in valve Replace valve Water Inlet Valve does not open Open solenoid coil Replace valve Stuck valve Replace valve No power to valve early part of harvest Check wire connections if ok replace AutolQ Controller Water Inlet Valve does not flow enough water Restriction in water supply Check water filters and or inlet screen Water Inlet Valve leaks thru Mechanical problem in valve Replac2. A refrigeration error could have been determined by the AutolQ Controller if the water temperature did not drop during the freeze cycle The controller will next check the compressor discharge temperature If the discharge temperature is too low the refrigerant error light will be switched on and the machine will Shut Down Resets Note The machine may be reset and restarted by pushing and releasing the Off push button switch and then pushing and releasing the freeze push button switch Water Cooled If the water to the water cooled condenser circuit is cut off during a freeze cycle the high pressure cut out will stop the operation of the compressor The control is an automatic reset but if the water interruption is prolonged the AutolQ Controller will shut the machine down when maximum freeze time has been exceeded January 2003 Page 13 SCE275 Adjustments How to adjust the water cooled discharge pressure Water cooled models use a water regulating valve to control how much cooling water flows thru the water cooled condenser At the top of that valve located in the bottom rear of the ice machine is an adjustment stem To Adjust 1 Attach a refrigeration manifold gage to the discharge access valve 2 While the unit is in the freeze cycle determine the discharge pressure it should be about 245 PSIG 3 If needed rotate the adjustment stem to increase or decrease the pressure A To increase discharg
3. Torque Stem Cap to into the system E When the proper charge is indicated on the scale shut off the manifold valve s 9 Shut off the valve on the refrigerant drum 10 Re open the manifold valves until all liquid has flowed out of the hoses 11 Shut the low side access valve on the ice machine Torque Core Cap to 7 12 12 Remove hoses from ice machine and replace all ft Ib caps Access Valves Note There are no valve cores in this valve January 2003 Page 36
4. The water system including the water reservoir distributors and evaporator surface the bin controls and the air cooled condenser filter and the condenser itself Water cooled units The water cooled condenser may over time and under certain water conditions become internally restricted by minerals These will have to be dissolved by acid or the condenser replaced Only a qualified service agent should attempt this type of service Air Filter air cooled only The air filter is located in a slot between the condenser fins and the condenser fans 1 Remove the grill on the left front of the unit Grill Screws Grill Removal 2 Locate the filter edge it is between the condenser fins and the fan motors 3 Pull the filter to the left though the slot in the front base of the ice machine fy RAK A XXXIX A y KIRIK arara EAAARRE LLY PXARY eee aaa re OES MA KX XXX Air Filter Removal 4 Wash the surface of the filter off with cold water or if torn or so dirty it can t be cleaned replace with a new filter 5 Return the filter to its installed position 6 Replace the grill Do not operate the unit without the filter in place Note If the unit has been operated without the filter in place the fins of the condenser will become fouled with dirt and must be cleaned If there is any doubt about dirt inside the fins of the condenser the cabinet should b
5. Very long ice repeats not start harvest Blinks twice Lack of water No harvest of and repeats fill ice Blinks three not used High discharge times and temperature repeats Is On all the Water valve Check for low time leaking thru discharge rapidly temperature or long freeze cycle Both On all the time Check for thermistor set unplugged or failed Restarts The controller will attempt to restart the ice machine after the first and second shut downs because of a water or refrigeration error There will be a 50 minute interval between restarts There are two exceptions to this 1 Lack of water The controller will try to refill the reservoir about every 20 minutes after shutting down for lack of water 2 Harvest errors The controller must sense two consecutive harvest errors in order to stop the machine The controller will try to operate the machine two additional times before a manual reset is needed January 2003 Page 19 SCE275 Sanitizing and Water System Cleaning Cleaning Schedule Scrub the door and frame edges once a week with soap and water Sanitize the bin interior once a month Clean the water system and air cooled condenser a minimum of twice per year If in an area of high mineral concentration in the water supply clean water system 4 times a year This ice machine will perform at its best when kept clean There are three areas to keep clean
6. 11 100 lt a HI VOLTAGE IN OUT WATER VALVE WATER PUMP 4 Off Button Pushing and HOT GAS VALVE AIR COOLED FAN MOTOR releasing this button will CONTACTOR COIL switch the machine OFF at the SCOTSMAN end of the next cycle If the button is pushed and HELD for more than 3 seconds the unit will switch off immediately STACKING gt PUSH BUTTON FUTURE USE gt 5 CONTROL SWITCHES To Reset First push and RESERVOIR amp DISCHARGE release the Off button then LINE THERMISIORS gt INDICATOR LIGHTS push and release the Freeze button BIN FULL BIN CONTROL SENSOR gt FREEZE HARVEST CLEAN BIN CONTROL SENSOR gt lt 1 RESERVOIR WATER LEVEL SENSOR S OFF ERROR LIGHTS WATER REFRIGERATION FACTORY USE gt January 2003 Page 15 SCE275 How The Electronic Cuber Works Controller Inputs 5 Time The controller measures and compares how long it takes for various events to happen It 1 Reservoir water temperature This is measured stores that data for future reference by a thermistor located in the water pump outlet 2 Discharge line temperature This is measured by Controller Outputs a thermistor located on the compressor discharge A 24 volt line 1 LEDs 3 Water level This is measured by an infrared 2 Inlet water valve sensor and float The float rises and falls with the 3 Hot Gas Valve water level and switches the sensor on and off as i it moves 4 Contactor C
7. 306 PSIG of Freeze Typical Low Side Pressure peak 130 PSIG 118 PSIG in Harvest Typical Discharge pressure in 270 PSIG 240 PSIG harvest Water Cooled 70 F air and 50 F water 90 F air and 70 F water Typical Freeze Cycle Time 15 minutes 16 minutes Typical Harvest Cycle Time 2 5 minutes 2 minutes Typical Low Side Pressure end of 24 PSIG 26 PSIG freeze Typical Discharge Pressure end 245 PSIG 245 PSIG of Freeze Typical Low Side Pressure peak 90 PSIG 93 PSIG in Harvest Typical Discharge pressure in 175 PSIG 190 PSIG Typical Harvest Ice Weight 2 8 to 3 2 lb Refrigerant Type Charge R 404A 18 ounces air cooled R 404A 12 ounces water cooled Hi Pressure Cut Out Automatic Reset water cooled only 400 PSIG Cut Out or 10 PSIG 300 PSIG Cut In or 10 PSIG Typical Compressor Amp Draw Freeze begins at 6 9 declines to 4 1 Harvest 7 7 3 Superheat 4 6 F 10 minutes into freeze cycle TXV is not adjustable Compressor Tecumseh hermetic capacitor start capacitor run A series January 2003 Page 25 SCE275 service Diagnosis Proper service diagnosis begins with observation comparing the complaint to the operation of the unit Ice machine service diagnosis should proceed from water to electrical and then to refrigeration Problem or Symptom Possible Cause Probable Correction Machine is off Bin is full
8. 4 Pull the hood and door assembly straight out is the ability to remove the cabinet from the ice until it can be lifted up machine without removing the ice machine from its installed position To Remove To remove the cabinet base the hood must be removed first 1 Remove 5 screws and the three grills at the front of the base 5 In the area behind the grills removed in step 1 are two knobs similar to those removed in step 3 2 Push and hold the Off button the AutolQ Controller until the machine has switched OFF Be certain the ice machine has been switched off STEPS Unscrew and remove the two knobs 6 Locate the bin drain Loosen the hose clamp holding the drain tube to its fitting and pull the drain tube off of the fitting 7 Lift up the front of the base and rotate the base up and off of the ice machine Note Controller on side of cabinet on G series and higher 3 Open the bin door and unscrew the knobs at the left and right inside of the ice storage bin Unscrew the knobs all the way out STEP 3 The machine is now exposed for service January 2003 Page 8 SCE275 Component Location The ice machine is designed for front service When the bin is removed the condensing unit is Many components are serviceable from the front visible without removing the cabinet With the cabinet removed nearly all components are serviceable Water Distributors Evaporato
9. a freeze cycle for a few more seconds 0 60 depending upon discharge temperature Note If the freeze cycle exceeds the preset Maximum of 35 minutes the AutolQ Controller will Shut Down on a Refrigeration Error 9 The end of Freeze cycle will see the machine in this state Water level below harvest position Condenser fans will be off Water inlet valve will be off Water pump will be ON Compressor will be ON Hot gas valve will be off At this point Harvest begins and the AutolQ Controller switches the Harvest indicator light ON Note If there is a power interruption the AutolQ Controller will automatically restart the machine with a process that begins with returning the machine back to a normal state water re fills the reservoir the unit freezes for 30 seconds and then goes thru a 4 minute harvest After harvest it returns to a new Freeze cycle While in this electrical restart mode the controllers Freeze light will be blinking even when it is in a Harvest cycle January 2003 Page 18 Technicians Only Harvest Cycle Operational Sequence Harvest The air cooled fans are off The water valve opens and fills the reservoir to the Full level The water pump shuts off it will restart in less than a minute The AutolQ Controller checks how long it takes to fill the reservoir and if it was too much time the machine Shuts Down on Water Error Note The machine will automatically attempt to restart after shutting
10. down thru the slot in the sensor body AutolQ Controller Controls the operation of the ice machine Turns it on and off switches it between cycles shows information via indicator lights and shuts the machine down if there is a problem Evaporators Freezing Compartment Location of the 2 evaporators Ice forms on the evaporators and is released when warmed up during the harvest cycle Cube Deflector The slots in the inclined deflector let the water falling from the evaporators back into the reservoir but when ice falls during harvest the ice slides off into the bin Water Trough Diverts water from the evaporators to the right and left to keep water off the ice Refrigeration Service Access Valves Only to be used by a certified technician Allows access to the refrigeration system for diagnostic information Water Pump Forces the water from the reservoir to the top of the evaporators The motor is separated from the reservoir water to minimize contact with the water Compressor The refrigerant vapor pump it forces the refrigerant to flow thru the refrigeration system tubing Hot Gas Valve Closed during freeze it opens during harvest to divert hot discharge refrigerant gas into the inlet of the evaporators Condenser Either air or water cooled discharges the heat produced in ice making January 2003 Page 10 SCE275 AutolQ Controller Indicator Lights Cycle Definitions Bin Full On when bin is
11. down because of a lack of water The time between restarts is about 20 minutes The inlet water valve will stay on and open for a predetermined fraction of the time it took to fill the reservoir This overflows and rinses the reservoir water During the Harvest Cycle ice will be falling from the evaporators and between the bin control s electric eyes The harvest cycle s length is based on the actual time from the start of the prior harvest cycle until the last cube fell plus an added amount of time as a margin The maximum harvest cycle time allowed is 8 minutes Harvest time is varied by the AutolQ Controller based on the prior harvest cycle s length If no cubes fall or are sensed by the end of Maximum Harvest Time the controller senses a refrigeration error If the next cycle also produces a refrigeration error the machine Shuts Down Note The last Harvest cycle before shutting off on Bin Full will be longer than normal 4 5 minutes During a harvest cycle the water pump will shut off when the bin sensors indicate that the bin is full Note The machine will not restart for 4 minutes after switching off on Bin Full unless the freeze button is pressed Diagnostic Lights SCE275 There are two diagnostic lights one to indicate a water problem and the other to indicate a refrigeration problem If a Diagnostic Light Water Light Refrigeration Light Blinks once and Water pump did
12. full goes on and off as ice falls during a harvest cycle Freeze On when the unit is in the Freeze cycle blinks when a freeze mode is pending Harvest On when the unit is in the Harvest cycle Clean On when the unit is in the Clean cycle blinks when preparing for a clean mode Off On when the unit has been switched off blinks when the machine is preparing to shut off Water Error On when the controller has identified a problem with the water system Refrigeration Error On when the controller has identified a problem with the refrigeration system Freeze The refrigeration system is operating to remove heat from the evaporators The compressor fan motor if air cooled and water pump are ON Harvest The refrigeration and water systems are operating to harvest the ice cubes While the compressor is on for the full cycle the water pump will be off at the beginning and inlet water valve will switch off before the end Clean The Inlet Water Valve opens to fill the reservoir The Water Pump starts The Clean indicator light is switched ON A manually initiated rinse flushes the system PUSH BUTTON CONTROL SWITCHES INDICATOR LIGHTS BIN FULL FREEZE HARVEST CLEAN OFF ERROR LIGHTS WATER REFRIGERATION January 2003 Page 11 SCE275 Initial Start Up 1 Remove two screws and the left grill G series and higher 2 Locate the AutolQ Controller use a flashlight to see the buttons and
13. or 2 25 teaspoons of liquid household bleach or an amount of locally approved sanitizer of sufficient strength to create a sanitizing solution equal to 200 ppm of sodium hypochlorite in 75 gallons 2 8 I into the reservoir water 19 Thoroughly immerse the cube deflector in a container of sanitizing solution 20 After the sanitizing solution has circulated for 10 minutes push and release the Clean button This starts the rinse process 21 Continue the rinsing process for 20 minutes then push the off button to switch the machine off 22 Repeat steps 10 15 23 Return the cube deflector to its original position 24 Push and release the Freeze button 25 Return the front grills to their normal positions and secure to the machine with the original screws November 2004 Page 21 SCE275 Additional Maintenance Water Distributors It may become necessary to remove the water distributors from the top of the evaporator and clean de mineralize them outside of the ice machine 1 Remove right front grill 2 Push and release the OFF button 3 Remove the machine s hood amp door 4 Reach over the water distributors and pull the hose off 5 Push the two water distributors to the right until the left end clears its retaining slot then pull the left end up 6 Repeat for the back one 7 Examine the top of the evaporators The Water Distribution Channels must be free from mineral build up If build up is
14. the 3 Attach the charging hose to the drum manifold valve to flash off the liquid before it enters the ice machine Do this until the 4 Open the valve on the drum and purge the charging proper amount of refrigerant has been 096 weighed into the system 5 Zero out the scale When the system is serviced a special liquid 6 Shut the low side access valve at the ice machine line drier is required It is included with 7 Open the discharge manifold valve full open replacement compressors 8 Watch the scale when the correct charge is shown R 404A is not compatible with mineral oil so shut the manifold valve these ice machines use Polyolester oil Polyolester oil absorbs water very easily When Note If all of the charge will not go in the discharge l side one of these refrigeration systems is opened for service it must be re sealed as soon as A Shut the discharge access valve at the ice f machine possible 15 minutes maximum Special leak detection equipment is required to B Switch the machine on locate small refrigerant leaks Usually a leak C Open the low side access valve at the ice detector capable of detecting a Halongenated machine refrigerant or R 134a will work Check with the D Open the low side manifold valve and observe leak detector manufacturer if in doubt the sight glass to be certain that only gas is flowing Allen Wrench n N Torque Stem to _ lt 6 8 ft Ib
15. 20 minutes then push the off button to switch the machine off Go thru steps 9 23 to sanitize the ice machine water system or go to step 24 to finish the cleaning process 9 Mix 2 gallons of Sanitizer solution Follow local codes for Sanitizer Note A possible sanitizing solution may be made by mixing 1 ounce of liquid household bleach with 2 gallons of warm 95 115 F potable water 10 Locate the two three prong head bolts holding the hood to the bin and remove them 11 Remove the hood from the ice machine 12 Locate the evaporator cover and remove the four thumb screws that hold it to the machine Remove the evaporator cover 13 With rubber gloves and a clean cloth or spray bottle use the sanitizer solution to thoroughly wash or spray all interior surfaces of the ice storage bin hood knobs and bin door with the sanitizing solution Wash the joint between the hood and bin with the sanitizing solution Also wash or spray the evaporator cover the inside back wall of the freezing compartment the top of the water distributors the exterior surface of the reservoir and the troughs with the sanitizing solution 14 Return the evaporator cover to its original position and secure it with the original thumb screws 15 Return the hood to its normal position and secure it to the machine with the original bolts 16 Pull cube deflector out of the reservoir 17 Push and release the Clean button again 18 Pour 11 ml
16. CM but should only be plugged into a circuit dedicated to the ice machine THE NAMEPLATE IS LOCATED HEATER Waris i mance ON THE BACK PANEL MTOM fOLTS RLA FLA WHP LRA A Serial Number Plate is Located sir on the Front Edge of the Base OR HACR TYPE CIRCUIT BREAKER Behind the Right Front Grill Dares 4D ise scorsman AutolQ Controller Controller Location in G Behind Right Series and Higher Grill in A thru F Series Model Number Dimensions Basic Condenser Total Total Unit Refrigerant R 404A w o legs Electrical Type Load Wattage HP62 H x W x D Amps SCE275A 1G 33 x 30 x 30 115 60 1 Air 15 18 ounces SCE275A 32G 33 x 30 x 30 208 230 60 1 Air 8 4 18 ounces SCE275W 1G 33 x 30 x 30 115 60 1 Water 15 12 ounces SCE275A 6G 33 x 30 x 30 230 50 1 Air 7 5 1725 18 ounces SCE275W 6G 33 x 30 x 30 230 50 1 Water 7 5 1725 12 ounces January 2003 Page 2 SCE275 For The Installer Environmental Limitations The ice machine must be installed indoors in a controlled environment Min Max Air Temp 50 F 100 F Water Temp 40 F 100 F Water Pressure 20 PSI 80 PSI Voltage 60 Hz 103 5 126 5 Voltage 50 Hz 207 253 Operating the ice machine outside of the above limitations or outdoors is potentially damaging to the machine and it is misuse of the machine This may void the warranty Scotsman Ice Systems are designed and manufactured w
17. SCE275 Introduction To the owner or user This service manual is The SCE275 automatically maintains the level of intended to provide you and the maintenance or ice by turning on when the ice level falls and service technician with the information needed to switches off when the bin is full install start up clean maintain and repair this This unit is serviceable in place the ice storage bin product and hood may be removed from the chassis to The SCE275 is an ice machine that produces allow service access without removing the ice cubed ice on a vertical freezing surface The cubes machine from its installed position The fall into the ice storage bin where they break up refrigeration system uses R 404A as the into individual cubes refrigerant Table of Contents This manual was printed on recycled paper Parts lists and wiring diagrams are located in the center of this manual January 2003 Page 1 SCE275 Specifications H WATER REGULATOR BACK VIEW 3 8 18 NPT N W C ONLY i S gt POTABLE 4 00 IN 3 68 IN Da _ WATER INLET 10 16 CM 9 35 CM N a 3 8 FLARE E ie MINIMUM UTILITY 4 CLEARANCE 4 59IN 406 IN 11 66 CM 49 31 CM L 3 4 FPT I tt i Ga a DRAIN 6 00 IN ys 15 2 CM 1 68 IN _ ELECTRICAL CORD LI COND DRAIN 4 27 CM 1 2 13 NPT 7 17 IN CONEY 18 21 CM7 9 12 IN 23 16 CM The unit is equipped with an electrical power cord 11 35 IN ae 28 83
18. achine is operating correctly the reservoir water temperature will fall at a standard rate The AutolQ Controller will be checking to see if the water temperature fall matches that rate If not it re checks the discharge line temperature If too low it Shuts Down on a Refrigeration Error If the discharge temperature is acceptable the water system is checked by shutting off the water pump and determining if the water level goes up enough If it does not it is assumed that there is a water pump problem and the machine Shuts Down on a Water Error If the water level does measure up the water pump is restarted and the AutolQ Controller then measures how long it takes to lower the water level If the water level does not fall the machine Shuts Down on a Water Error 6 Once per cycle the machine may shut off the water pump It only does this when the water temperature reaches a preset minimum The pump will only be off for a few seconds After the pump restarts the inlet water valve opens to refill the reservoir 7 When the water level falls to the pre set limit the inlet water valve will open to refill the reservoir This happens 2 times every freeze cycle 8 As the machine makes ice the water level in the reservoir will ultimately fall a third time to the Harvest Level when the top electric eye in the water level sensor is disrupted by the adjustment screw At that point the fan may be shut off and the unit continues in
19. ale off the interior of the bin 3 After the scale has been removed rinse all surfaces inside the bin with clean potable water To Drain Reservoir Completely if desired 1 Remove front panel 2 Push and hold the Off button 3 Remove screw holding reservoir cover pull inlet tube out of reservoir cover lift cover out of machine 4 Unplug water pump connection remove ground screw 5 Remove float from float stem 6 Unplug water level sensor 7 Lift pump and sensor out of the machine 8 Pull up on standpipe to release water 9 Reverse steps 2 8 to reassemble Note Be certain that the float is fully re seated on the stem and the water pump bracket is positioned properly on the base Make sure that the stand pipe is properly seated 10 Push and release Freeze button 11 Replace front panel January 2003 Page 22 SCE275 Additional Maintenance Exterior Cabinet Cleaning To Check the Inlet Water Valve Screen The exterior cabinet may be cleaned by scrubbing 1 Disconnect the electrical power with soap and water Do not use cleaners NAN 2 Shut off the water supply containing petroleum products 3 Remove the hood and bin A nylon type brush may be used to scrub stubborn deposits 4 Unplug the electrical connection of the inlet DN water valve Additional Maintenance Inlet Water Valve Screen 5 Remove the screws holding the inlet water valve ao to the cabinet The inlet water val
20. and will not allow current to flow It must cool down to about 120 F Before current will pas through it again January 2003 Page 29 SCE275 Removal and Replacement AutolQ Controller Begin by disconnecting the electrical power AWARNING Electrical shock hazard Electrical shock can cause personal injury Disconnect power before beginning to service 1 Remove 2 screws and the right front grill 2 If the machine is operating push and hold the Off button until the machine switches off 3 Unplug or disconnect electrical power 4 Remove the one screw at the right end of the AutolQ Controller 5 Pivot the controller up and away from its mounting bracket 6 Unplug all connecting wires 7 Reverse steps 6 1 to replace the controller Electrical Box and Components Below the bin on the left side of the chassis is a sheet metal box containing the transformer compressor contactor compressor relay start capacitor and run capacitor This box may only be accessed by removing the hood and bin After that 1 Remove the cap screw securing the electrical box to the ice machine chassis 2 Pull the electrical box forward to release it from the tab at the back of the box 3 The box may now be placed in a horizontal position for better service access Standpipe The overflow standpipe is located at the back of the reservoir The water pump and water level sensor must be removed to get access to it Th
21. d releasing the Freeze button increases the purge one level up to the maximum then it goes to the minimum 4 The machine will automatically restart after 60 seconds of no switch inputs or restart the machine by pushing in and holding the Off button for more than 3 seconds then releasing it The unit will then be Off From there the machine may be placed ina freeze cycle by pushing and releasing the Freeze button January 2003 Page 14 SCE275 How To Operate The AutolQ Controller The AutolQ Controller is a microprocessor based device that receives input from several sources and switches various components on and off Its manual control is thru the use of the Push Button Control Switches 1 Freeze Button Pushing and releasing this button starts or restarts the machine The AutolQ Controller remembers what cycle it was last in and returns to that cycle 2 Harvest Button Pushing and releasing this button will cause the machine to go directly to a Harvest Cycle Can be done from Freeze or Off The machine will switch Off at the end of the Harvest cycle 3 Clean Button Pushing and releasing this button will cause the machine to only power the water pump for circulation of ice machine cleaner After the ice machine cleaner has circulated for about 10 minutes a second push of this button will switch on the rinsing system to flush out the dissolved scale and ice machine cleaner LOW VOLTAGE IN OUT a 11 1
22. d then repeats check for a reason for high discharge temperatures such as a bad fan motor or very hot ambient Unit does not go into harvest exceeds maximum freeze time Push and release Off button Push and release Freeze button Check operation Push cube size float down and check operation Unit runs and both Error Lights are ON Temperature sensors out of range Replace the temperature sensor set water and discharge Same but 1 light is on Reservoir temp wrong Check water temp and sensor Machine may be reset by pushing and releasing the Off button then pushing and releasing the Freeze button See following pages January 2003 Page 26 Service Diagnosis SCE275 Problem or Symptom Possible Cause Probable Correction Unit is off because of a Harvest Problem Bin controls did not sense ice falling unit stayed in harvest until the maximum harvest time ran out Check bin controls The bin full light should be off If it is on or blinking the bin controls may be dirty Clean if dirty The board and bin controls may also need to be checked Push and release Off button Push and release Freeze button Check machine operation Check if ice is made and harvests Bin controls or AutolQ Controller may have failed See Unit does not shut off below Other components may have failed Check the next page Cubes a
23. e bin controls and brackets Remove Mounting Bolt N 4 HINA PX ATAN LEY ZY fy F4 7 lh 7 Y 4 HY LLL ZA YY LL Ji LEG YY R eg fp Y A A Z tay Zz aie YEE LEY fa A LEB L ey BE z ff LL B EEE 2 D Z LL cams IL R 2 Wy LF Ley Z lt BL TAT MET Z fom ey Bi DD ZN WY re ae Remove the Mounting Bolt First Ly Caa 7 N Vv iM ad ey 8 Remove the thumb screws holding the bin controls to the evaporators Bin Control Bin Controls May Have a Shield Over Them 9 Pull the bin controls up and out of the ice machine 10 Trace the wires back to the connectors and unplug them 11 Reverse steps 10 1 to replace the bin controls Flange of Bin NS f P Trough AN Note They MUST be changed as a set The bin controls must be positioned so that the flange of the bin control is behind the water trough January 2003 Page 33 SCE275 Removal and Replacement Thermistors There is a thermistor to sense reservoir water temperature and another to sense compressor discharge temperatures If the AutolQ Controller senses a fault with the thermistors both diagnostic indicator lights will be glowing continuously AWARNING Electrical shock hazard Electrical shock can Cause personal injury Disconnect power before beginning to
24. e height of the standpipe is very important Measured from the top edge of the reservoir to the very top of the standpipe the distance should be 3 2 0 January 2003 Page 30 SCE275 Removal and Replacement Water Pump Water Level Sensor Water Pump The pump provides the force to move the water from the reservoir to the freezing surface The pump does not need oil but if it becomes noisy overheats or will not pump it should be replaced Be certain to confirm electrical faults with a voltmeter or ohmmeter before replacing the pump The pump should operate with the compressor AWARNING Electrical shock hazard Electrical shock can cause personal injury Disconnect power before beginning to service components 1 Unplug or disconnect the electrical power 2 Open the bin door and unscrew the knobs holding the hood to the bin 3 Pull the hood off the bin 4 Remove ground wire from mounting screw 5 Unplug water pump 6 Unplug water level sensor 7 Remove the 2 screws holding the reservoir covers to the reservoir 8 Pull the water pump and water level sensor assembly up and out of the reservoir 9 Remove the screws holding the water pump to the two reservoir covers and the pump is free to be replaced 10 Reverse steps 9 1 to replace the pump Mounting Plates Water Level Sensor 1 Unplug or disconnect the electrical power 2 Open the bin door and unscrew the knobs holding the h
25. e machine is not designed for outdoor use It must be installed indoors in a controlled environment The air and water temperatures must not exceed rated limits Electrical power is supplied through a cord connected to the unit All local codes must be followed Pre installation 1 Inspect the place where the ice machine is to be installed Check for space for the cabinet water supply drain availability and electrical power supply No extension cords are allowed The building drain inlet must be lower than the drain outlet s at the back of the ice machine The water supply must have a hand shut off valve accessible when the unit is installed 2 Determine the method of installation is the machine to be installed under the counter Is the drain in the floor under the machine Is the water inlet valve accessible Unpack and Assemble 1 Remove legs and scoop from storage bin 2 Remove shipping materials from ice making area Remove Material Located Between Cube Deflector and Troughs 3 Place corner posts from the shipping carton on the floor behind the ice machine Tip the ice machine on its back and remove the shipping skid 4 Screw the legs into the threaded holes in the base of the ice machine 5 Tip the ice machine back to an upright position January 2003 Page 4 Installation SCE275 For The Plumber Begin by planning the installation and obtaining the needed supplies 34 soft copper tub
26. e pressure reduce water flow rotate the stem counter clockwise B To decrease the discharge pressure increase water flow rotate the stem clockwise Remove the manifold when done Note The water outlet temperature should be between 100 110 when the valve is properly set Thermostatic Expansion Valve The TXV is not adjustable do not attempt to adjust it How to Adjust the Amount of Water Purge Adjustment is done by use of the control buttons on the AutolQ Controller Examine the next section to become familiar with the AutolQ Controller before beginning 1 If the machine is on push and hold the OFF button for more than 3 seconds then release it This switches the machine Off 2 Push and hold the OFF button for more than 3 seconds until all LEDs flash on then release it 3 Examine the green LEDs They should have all flashed once then certain ones will have turned on to indicate which purge level the machine is set at There are 5 levels of purge available 1 Maximum Purge is when All 5 lights are ON Note This setting may extend the harvest cycle and reduce capacity 2 Heavy Purge is when these 4 lights are ON Freeze Harvest Clean Off 3 Standard Purge Factory setting is when these 3 lights are ON Harvest Clean Off 4 Moderate Purge is when these 2 lights are ON Clean Off 5 Minimum Purge is when this light is ON Off Adjust by pushing and releasing the Freeze button Pushing an
27. e removed and a qualified service agent should clean the condenser January 2003 Page 20 SCE275 Sanitizing and Cleaning In Place Cleaning of the Ice Machine Water System 1 Remove and discard all ice from the bin If the cleaning was pre planned the ice machine could be switched off the night before to minimize waste 2 Remove the left front grill 3 Push and release the Harvest button this releases any ice that may be on the evaporators and warms them up 4 Wait for the machine finish the Harvest cycle the machine will switch off The Off light will be blinking 5 Push and release the Clean button The Clean indicator light will be blinking and the pump will re start 6 Pour 8 ounces 235 ml of Scotsman Ice Machine Cleaner into the reservoir water below the evaporators 7 After the ice machine cleaner has circulated for 10 minutes push and release the Clean button Ice Machine Cleaner contains acids These compounds may cause burns If swallowed DO NOT induce vomiting Give large amounts of water or milk Call Physician immediately In case of external contact flush with water KEEP OUT OF THE REACH OF CHILDREN A CAUTION Pouring Ice Machine Cleaner into the Reservoir Cube Deflector This starts the rinse process The Clean indicator light will be ON Note The rinse flushes any residual cleaner out of the ice machine s water system 8 Continue the rinsing process for
28. e valve Compressor does not work Unit in Clean cycle Push and release Freeze button Contactor coil open Replace contactor Open starting components Check and replace Open windings Check and replace compressor Internal valve failure Replace compressor January 2003 Page 28 SCE275 PTCR The D series and higher use a PTCR Positive Diagnosis Temperature Coefficient Resistor in place of a 1 Disconnect electrical power conventional start relay and start capacitor 2 Check if the PTCR is cool enough to handle safely Power from the contactor connects to the PTCR and If not wait 5 minutes for it to cool off to the Run Capacitor i 3 Disconnect both leads to the PTCR and measure its resistance with an ohmmeter If the PTCR reads less than 22 ohms or more than 40 ohms replace it A wire connects the other terminal of the PTCR to the compressor s start winding Another wire connects the run capacitor to the start winding A parallel circuit connects power from the contactor to the Run winding of the compressor A PTCR changes resistance sharply when its temperature changes When the PTCR is cold it connects full current to the compressor s start winding After a very short time the PTCR heats up and shuts off the current flow Under normal conditions the PTCR s case is at about 180 F At that temperature the PTCR has very high resistance
29. evident scrub the channels with Scotsman Ice Machine Cleaner and a plastic bristle brush 8 Examine the water distributors Although they are made of a material that is resistant to mineral build up some may be present Soak or scrub the distributors in or with a solution of Scotsman Ice Machine Cleaner and warm potable water 9 Return the water distributors to their normal installed position 9a Snap the two distributors onto the water manifold Place them on the back evaporator right end first Push the distributors far enough to the right until the left end clears the retaining slot then release Check that the distributors are seated properly 9b Place the water hose onto the back water distributors 9c Repeat for the front evaporator 10 Reverse the above steps to reassemble The storage bin must be cleaned regularly to maintain a sanitary environment Once a week cleaning of the door and door frame with soap and water a hot water rinse and an air dry is a basic procedure Scale that may form on the plastic liner can be removed by scrubbing the surface with a mixture of Scotsman Ice Machine Cleaner and hot water Remove any scale prior to cleaning Removal of Water Distributors To Remove Scale From Bin Interior 1 Mix a cleaning solution of 4 ounces of Ice Machine Cleaner to 4 pints of hot 95 F 110 F water 2 Using rubber gloves dip a nylon scouring pad into the cleaning solution and scrub the sc
30. hen falls into Valve the bin The water Water Inlet pump willbe valve off for a short period of time at the beginning of harvest Filter Dryer Compressor Fan Motor S QR f Condenser January 2003 Page 17 SCE275 Technicians Only Freeze Cycle Operational Sequence How The Electronic Cuber Works This section is intended for the technician It is not necessary for the normal operation and maintenance of the machine The AutolQ Controller operates the ice machine by monitoring several input measures and switching various loads on and off Assuming the machine has been operational the Freeze cycle begins with the end of the Harvest Cycle Reservoir is full Condenser fan is OFF Water Inlet Valve is OFF Water Pump is ON Compressor is ON Hot Gas Valve is ON AutolQ Controller Operation Beginning freeze 1 Switches on the Freeze indicator light and shuts off the hot gas valve 2 Measures and stores the discharge temperature 3 Starts the fan motors air cooled only Fan control begins 4 minutes into the freeze cycle When the discharge temperature indicates that cooler ambient conditions exist the fan is cycled on and off every 30 seconds until it is switched of just before harvest If the discharge temperature exceeds the design maximum shuts the machine down ona Refrigeration Error 4 Checks for a bin full signal throughout the cycle 5 Measures the reservoir water temperature If the m
31. ice in cube port Use some ice Power is off check LEDs If all lights are out check power supply restore power if off Transformer is open If all lights are out and there is power check transformer output for 24 vac Unit has been switched off or has finished a Clean cycle Off Light is glowing Push and release Freeze button Unit has Shut Down Check for Refrigeration or Water Error Unit is off on a Water Error Water inlet valve malfunction Check water Light if the Light blinks 2 times and repeats check the water inlet valve for proper water flow Water pump malfunction Check that pump hose is attached and if pump is plugged in and working Water level sensor may have failed Check float stem reset machine If it will not reset or gives another water error and everything else is OK replace the water level sensor Unit is off ona Refrigeration Error Low discharge or long freeze cycle Check refrigeration Light If the Light is glowing there is a probable refrigeration problem or on water cooled a water interruption Harvest problem Check refrigeration Light If the Light blinks once and repeats look for a harvest problem This also indicates that cubes were sensed by the bin controls If the light blinks 2 times and repeats check for a harvest error no cubes sensed High Discharge Temp Check refrigeration Light If the Light blinks 3 times an
32. ing 3 rigid drain tubing 3 FPT fitting for bin reservoir drain connection 12 FPT fitting for condenser drain connection 34 FPT fitting for water cooled condenser inlet connection 1 Connect cold potable water to the 3 male flare at the back of the cabinet A water filter and hand shut off valve is recommended Flush the water line prior to connecting to the ice machine If water cooled connect a separate water inlet line to the water cooled condenser inlet fitting It should also have a hand shut off valve Plumbing Connections Water Cooled Shown Water Cooled Inlet Water Cooled Drain A loop of copper tubing may be used between the ice machine and the water supply This will allow the ice machine to be pulled out from its installed location without disconnecting the water line No back flow preventer should be needed in the inlet potable water line because provision for that is incorporated in this N S F listed product the water valve outlet is above the reservoir wall and cannot siphon 2 Connect a drain tube to each drain connection water cooled drain must be separate 3 Route the drain tubes to the building drain receptacle CONFORM TO ALL LOCAL CODES Reservoir amp Bin Drain Potable Water Inlet Drain Receptacle January 2003 Page 5 SCE275 For The Plumber Drain Configuration Water cooled models must use a separate drain tube from the reservoir bin drain The water co
33. ith the highest regard for safety and performance They meet or exceed the standards of UL NSF and CUL Scotsman assumes no liability or responsibility of any kind for products manufactured by Scotsman that have been altered in any way including the use of any part and or other components not specifically approved by Scotsman Scotsman reserves the right to make design changes and or improvements at any time Specifications and design are subject to change without notice Air Out Airflow on air cooled models is Intake through the left front grill Exhaust through the right front grill Do not install where this air flow is obstructed The SCE275 has a removable cabinet When installed the machine should have some extra clearance on the left and right sides so that the cabinet may be easily removed when the machine is in place January 2003 Page 3 SCE275 Installation Water The water supply for this ice machine has been in contact with many materials since it fell from the sky as rain All rain is slightly acidic and tends to dissolve the materials it comes in contact with During water s journey to the ice machine it has flowed over and through the ground been picked up by a municipal or private pump forced through a series of pipes of differing construction and may have been treated by the municipality providing the water This means that there is no such thing as pure water All water contai
34. lights 3 Plug the machine in or switch on the electrical power Note that the controller s indicator lights all flash on briefly when power is connected 4 Open the water supply valve to the machine 5 Push and release the Freeze cycle push button the Freeze indicator light will blink until the compressor starts The next several operations are automatic Initial Start 30 seconds The Freeze light begins to blink The Hot Gas Solenoid valve will be open The inlet water valve opens to fill the reservoir and shuts off when the reservoir is full Note If the reservoir does not fill the next steps do not happen The water pump starts Note if the pump does not start the next steps do not happen The inlet water valve opens again to refill the reservoir After 30 seconds the hot gas valve closes and the compressor starts Freeze Cycle The Freeze indicator light will come on The machine will stay in a Freeze cycle for many minutes Slush may appear in the reservoir it is temporary and normal Under certain conditions the pump may stop for a few seconds After that the inlet water valve will refill the reservoir The fan motors of air cooled models will begin to turn and soon warm air will be forced out the front of the cabinet After 4 minutes the fan motors may cycle on and off every 30 seconds in cooler ambients As the freeze cycle progresses the water level will fall and the inlet water valve will
35. luation and Warranty Registration Send it to Scotsman 10 Replace the front grill 11 Inform the user of the location and telephone number of the local service company Also inform the user of the required maintenance of the machine August 2000 Page 12 Notes On Operation 1 The electric eyes signal the ice machine to shut off whenever the bin becomes full After the eyes sense that there is ice between them the ice machine will shut off at the end of the next harvest cycle This last harvest cycle will be longer than the rest and will be for the Maximum Harvest Time Note Ice will normally fill up to the bottom of the evaporators before the machine shuts off 2 After the bin has filled the ice machine will not be able to restart for 4 minutes However if needed the Freeze button may be pushed and the unit will restart For example If ice is removed from the bin immediately after the machine has filled up and shut off the machine will not restart for 4 minutes 3 If the bin controls sense a bin full signal before any water is used float stem up the machine will shut off on bin full SCE275 If there was a problem during Initial Start Up If an error light came on check the following 1 Water error A water error could have been determined by the AutolQ Controller if the inlet water valve does not fill the reservoir or if the water pump does not start and lower the water level 2 Refrigeration error
36. n could be sanitized 3 Locate the scoop wash it and have it available for use when needed Final Check List 1 Is the ice maker cabinet in a room where ambient temperatures are within the minimum and maximum temperatures specified 2 Has the water supply been connected 3 Is the water pressure adequate 4 Have the water connections been checked for water leaks 5 Have the drain connections been made 6 Have the drain connections been checked for leaks 7 Is the cabinet level 8 Is the ice machine plugged into an electrical power supply of the proper voltage and is the ice machine the only load on that circuit 9 Has all of the shipping material been removed from the inside of the cabinet Check for materials between the cube deflector and the water troughs see page 4 Be sure the cube deflector is in place 10 Has the bin and cabinet been wiped clean and sanitized 11 Has the Customer Evaluation amp Warranty Registration form been filled out Check for correct model and serial numbers from the nameplate then mail the completed form to Scotsman 12 Has the owner user been given the name and telephone number of the authorized Scotsman Service Agency serving that location 13 To start up machine follow the directions on page 12 For more information on the unit turn to the next page January 2003 Page 7 SCE275 Removal of the Cabinet One of the most useful features of this ice machine
37. nd hold the off button until the machine stops 3 Remove the knobs holding the hood to the bin 4 Remove the hood 5 Remove the thumb screws holding the bin control brackets Removal of Bin Controls ZTN TL CLE JaN LI Q YJ Thumb Screw FA z LEY 9 Ma O N N f 7 ZE LY LY Vie LPL WP oA Le Vid LEU AA ly Fj g A Rj RD A fa VE Le LEZ VE ot LRR IDS RR AT LL TAVA MGA LY OL iy Ss YP LLL EF wy ES era Le ma a Yar VE a W Z2 cv ry 6 Lift the the bin control brackets up and out from between the evaporators Bin Controls Clean Here 7 Examine the bottom of the brackets there are two sensors in each bracket check that they are clear of mineral build up They may be wiped clean with ice machine cleaner to assist in removal of the build up Use a toothbrush if necessary to remove scale Be sure to drain the reservoir or go thru a Clean cycle to remove residual cleaner Note Do NOT use abrasive materials or cleaner on the bin sensor lenses January 2003 Page 24 Technical Characteristics SCE275 harvest Air Cooled 70 F air and 50 F water 90 F air and 70 F water Typical Freeze Cycle Time 15 minutes 18 minutes Typical Harvest Cycle Time 2 minutes 1 5 minutes Typical Low Side Pressure end of 24 PSIG 29 PSIG freeze Typical Discharge Pressure end 235 PSIG
38. ns some level of impurity There are two ways water carries the impurities suspended and dissolved Water filters can remove the suspended solids but cannot remove the dissolved portion Cube ice machines use more water than is made into ice the excess amount is used to dilute the concentration of minerals and rinse out the water system to keep the water scale from clogging up the machine That water rinse combined with water filters prolongs the times between needed water system cleanings The water to the ice machine should be filtered Water filters vary greatly in ability and function Install one that filters out suspended solids to a dimension of 5 microns or less The finer the filter the better but finer filters may plug up sooner than course ones It may be necessary to add a course filter ahead of the fine filter to prolong filter life The SCE275 is factory set for a water purge that will work in most water conditions While the amount of purge is adjustable only change it if necessary Note Water use adjustments are customer convenience adjustments they are not factory defects and are NOT covered by warranty This ice machine may be installed in the open or under a counter No clearance is required at the sides or top beyond what s needed to place the cabinet into position Air cooled models blow air in and out through the grills at the front Space is required for utility connections at the back The ic
39. oil 4 Bin fill level This is determined by a set of Serug Vonage electric eyes between the evaporators Ice 1 Water Pump eventually fills the bin and covers the cube 2 Air cooled Fan Motor deflector to the point that ice is between the bin controls and the evaporators after 20 seconds of blockage the bin controls signal the controller that no more ice is needed When ice is removed for use the ice between the evaporators slides out into the bin and the ice machine automatically restarts Note A few cubes may remain on the cube deflector this is normal If little ice is used the ice level will be high at the back of the bin As ice is used the ice will level out and fill the bin more evenly When The Machines Fills Up To Its Shut Off Point Ice Will Be On The Cube Deflector January 2003 Page 16 SCE275 Water System Water flows into the ice machine during the harvest Refrigeration System cycle thru the inlet water valve The water valve will NOT be open the complete length of the harvest cycle The water pump forces water to the top of the evaporators both in the Freeze and Harvest cycles Un frozen water falls thru the cube deflector and back into the reservoir The refrigeration system is similar to that of most commercial cube ice machines Heat is removed from the water and discharged out the condenser during the freeze cycle The evaporators are in series As liquid refrigerant pas
40. oled condenser drain should not be vented Drain tube material must be rigid and meet local code Traps in the bin drain line without vents ahead of them will cause poor draining The bin drain must be vented if there is a long horizontal run 5 or more All drains are gravity and must have a minimum fall of 14 per foot of horizontal run Maintain the air gap required by local code between the end of the drain tubes and the building drain receptacle Note Drain tubing should be insulated to prevent condensation from forming on the tubing Vented Drain Potable Water Supply Air Cooled Plumbing ae Connections January 2003 Page 6 Installation SCE275 For The Electrician The 115 volt 60 Hz model is a cord connected unit and must be on a separate 115 volt AC 60 cycle single phase power supply The maximum fuse size for this circuit should be 15 amps Per the nameplate use fuses or HACR circuit breakers Connect 50 Hz models to the correct voltage and fuses Follow All Local Codes This Unit Must Be Grounded Do not use extension cords and do not disable or by pass ground prong on electrical plug After Utility Connections 1 Level the cabinet use the leg levelers on the end of the legs to adjust the cabinet height Legs should have been installed when the unit was unpacked Check for levelness at the reservoir 2 Wash out the bin and hood If desired the interior of the bi
41. ood to the bin 3 Pull the hood off the bin 4 Remove ground wire from mounting screw 5 Unplug water pump 6 Unplug water level sensor 7 Remove the 2 screws holding the reservoir covers to the reservoir 8 Pull the water pump and water level sensor assembly up and out of the reservoir 10 Pull the float from the float stem 11 From below the reservoir cover push the mounting tabs together to release the water level sensor from the reservoir cover 12 Reverse steps 11 1 to replace the water level sensor Water Pump S Water Level January 2003 Page 31 SCE275 Removal and Replacement Inlet Valve amp Water Trough Water Inlet Valve The water inlet valve is located in the lower back of the cabinet The hood and bin must be removed to gain access to this part The valve is directly connected to the incoming water supply With the water supply turned off the connection can be removed from the front of the Cover Removed From machine Utility Bracket 1 Go thru the steps on page to remove the hood and bin 2 Locate the inlet water valve Pull the wire harness off the terminals of the valve 3 Remove the cover over the utility connections 4 Use two wrenches and loosen the nut on the male flare holding the water supply to the water inlet connection Remove the water supply line from the water inlet valve 5 Remove the two screws that hold the water inlet valve to the cabinet Inlet Wate
42. open to refill the reservoir This will happen twice every cycle The freeze cycle will continue until the water level in the reservoir has fallen again to its factory set point then the AutolQ Controller may switch the air cooled fans off After a short time the Harvest Cycle will begin Harvest Cycle The Harvest indicator light will be ON The hot gas valve will open The water pump will stop It will restart in less than a minute The Inlet water valve will open The machine will fill the reservoir and overflow it for a specified number of seconds then shut off The harvest cycle may still be in progress The Bin Full indicator light will go on and off as ice falls from the evaporators 6 Machines are shipped from the factory with the purge level set to accommodate average water conditions To achieve optimal machine performance set the purge level to the minimum setting Note While the amount of water purge is adjustable only those installations with a water supply known to be excellent very low TDS or total dissolved solids should adjust to the minimum setting See page 14 for purge adjustment instructions 7 Observe ice harvest Check that the ice slides easily into the bin and does not hang up on any mis positioned part 8 After about 5 minutes the machine will return to a freeze cycle Note The first 1 2 harvest cycles will be very long to establish a typical harvest time 9 Fill out the Customer Eva
43. r 6 Pull the water inlet valve out and remove the Valve discharge hose from the outlet of the valve 7 The valve may now be removed from the ice machine 8 Reverse steps 7 1 to replace the valve Water Trough 1 See the next page and remove the bin controls first steps 1 9 2 Pull out the cube deflector View of Machine Without Bin or Hood 3 Unsnap the trough from the evaporator pins and rotate the front trough out of the machine 4 Unsnap the trough from the evaporator pins and rotate the back trough out of the machine 5 Reverse to reassemble Note The troughs are marked FRONT TROUGH and BACK TROUGH Begin by hanging the troughs on the evaporator s front pins and then rotating the trough until it snaps onto the back set of pins Be certain that all 4 pins are engaged on each trough January 2003 Page 32 SCE275 Removal and Replacement Bin Control Set Bin Controls The bin controls are located in between the two evaporators one on the left and one on the right The hood must be removed to gain access to them 1 Remove the right front grill 2 If the machine is making ice push and release the Harvest button 3 After the ice has fallen off the evaporators push and hold the Off button until the machine stops 4 Unplug the machine or disconnect the electrical power 5 Remove the two knobs holding the hood to the bin 6 Slide the bin forward to remove it from the ice machine 7 Locate th
44. r Cover Reservoir Evaporators Water Trough Cube Deflector Compressor Refrigeration Access Valves Water Inlet Valve AutolQ Controller location shown for A thru F Fan Motors series Component Location These parts are located inside the bin Evaporators Water Reservoir Water Pump Cube Deflector Water Troughs Water Distributors Water Level Sensor Controller Location G series and higher January 2003 Page 9 SCE275 Component Description High Pressure Cut Out Water Cooled Only This is a switch that opens to stop the ice machine when the internal refrigeration pressures become too high over 450 PSIG It is an automatic reset Evaporators Where the ice is formed There are two vertical evaporator plates that form vertical strips of cubes The strips break up into individual cubes as they fall Thermostatic Expansion Valve The thermostatic expansion valve is used to meter liquid refrigerant into the evaporator adjusting the flow of refrigerant as required to make ice Reservoir Contains the water used for ice Water Inlet Valve Opens to allow water into the reservoir Water Level Sensor Controls the size of the ice cube by measuring how much water is used in a cycle It consists of a float stem and electric eye The stem will move slightly when the pump is on this is normal As the machine makes ice the reservoir water level will fall and the visible portion of the stem will slide
45. re too large Cube size control float is sticking Check clean Inlet water valve leaks thru Check inlet water valve Cubes are too small Unit not level Check levelness Not enough water Check for leak in reservoir Low ice capacity Dirty condenser or filter Replace filters clean condenser Blockage of air flow Remove anything from in front of the machine that blocks the free flow of air Low refrigerant charge Check system If there is a low charge find the leak recover the refrigerant repair the leak replace the dryer evacuate and weigh in the nameplate charge Unit does not shut off Bin control system may have failed Check bin controls Check bin full light if off place something between the electric eyes Note Hood must be on Use a piece of duct tape about 4 long and position it by hand between the evaporators The bin full light should begin to blink after 20 seconds of continuous blockage it will glow steadily If not check operation of electric eyes by unplugging 4 and jumping out the two pins on the controller If the bin full light blinks replace the bin controls If it does not blink replace the controller Note Leaving 4 unplugged and jumped for 20 seconds will shut the machine down on a bin full It will restart after 5 minutes or may be reset by pushing the Freeze button January 2003 Page 27 SCE275 Service Diagnosis
46. service Disconnect electrical power before beginning 1 Remove the grills from the front of the cabinet 2 Push and hold the Off button to shut the machine Off 3 Remove the hood 4 Remove the bin 5 Locate the thermistor attached to the discharge line of the compressor Remove the insulation covering the thermistor and un clip it from the discharge line 6 Unplug the thermistor from the wire harness by AutolQ Controller 7 Plug the new set into the AutolQ Controller 8 Route the thermistor to the discharge tube of the compressor and attach it to the discharge line in the same place as the original 9 Re cover the thermistor with insulation 10 At the upper left of the machine un plug the water pump and water level sensor 11 Lift up the water pump mounting plate and pull the water hose off the water pump Remove the water pump and water level sensor and set aside 12 Remove the water thermistor from the discharge hose of the water pump 13 Unplug the thermistor from the wire harness 14 Insert the new thermistor into the discharge hose Do not allow the body of the thermistor to contact the hose opposite of the mounting hole 15 Secure thermistor with cable tie 16 Plug thermistor into wire harness 17 Return water pump and water level sensor to its normal position Reconnect power and ground wires 18 Return bin and hood to their normal positions 19 Reconnect electrical power and pu
47. ses thru the Thermostatic Expansion Valve it enters the bottom of the front evaporator and ice will form there first Refrigerant then flows out the top of the front evaporator and enters at the bottom of the back evaporator finally flowing out the top row Water Level Of the back As water is turned into ice the water level in the reservoir falls to the full cube setting and the Water Level Sensor sends a signal to the AutolQ Controller to open Water SY the inlet water valve to refill the reservoir This happens eg twice per freeze cycle i cA Senge evaporator The third time the water Ale Water and back to J f 0 Pump level falls to the full cube OF a the setting it indicates to the be compressor AutolQ Controller that it is p When cubes time to begin the Harvest cycle The air cooled fans will shut off just before the beginning of the Harvest cycle During the Harvest cycle water again enters the water reservoir and overfills it to rinse the reservoir of accumulated minerals It does NOT overflow for a fixed amount of time but for a time determined by need to be released Harvest the Hot Gas Bypass Valve is opened and hot discharge gas flows directly from the Reservoir COMPressor to the Drain front evaporator inlet This warms up the evaporators and the surface of the ice frozen to the evaporator surface melts Ice the AutolQ Thermostatic Controller Expansion t
48. sh the Freeze button to restart the machine 20 Return the grills to their normal position January 2003 Page 34 SCE275 Water Distributors Water Distributors are a snap fit on the top edge of the evaporators They are interchangeable left to right and front amp back Water Distributors When the water distributor s have been removed the top edge of the evaporator is exposed That edge has small slots in it Those slots must be clear of mineral scale build up to keep the water distribution even Slots January 2003 Page 35 SCE275 Refrigeration System Service R 404A This ice machine uses R 404A refrigerant and Liquid Charging polyolester oil Do NOT use mineral oil in this refrigeration system In preparation for charging the low side hose should have a sight glass and or a restrictor device such as R 404A is a Near Azeotrope so liquid charging a Charge Faster installed in it for metering liquid is required into the low side of the system X Weigh in as liquid as much of the charge as 1 After a thorough evacuation to at least 300 microns possible into the discharge line shut off the manifold valves and switch off the vacuum X Install a sight glass between the manifold PUMP and the suction side hose and carefully 2 Place a drum of R 404A onto an electronic scale meter liquid into the suction side using
49. ve has a screen on its inlet side to keep debris from flowing into the valve In some cases this screen may become clogged or restricted by debris build up Check for the proper water flow Flow rate is 1 25 G P M 1 Remove hood 2 Remove right front grill 3 Obtain a measuring cup and a watch 4 Pull the water discharge tube out of the reservoir Inlet Water and place it in the cup Valve 5 Push and release the Harvest button 6 If working properly the water valve will fill an 8 oz cup in about 3 4 seconds Be prepared to push the Off button If it does not the water valve inlet or other water device is restricted Removal of Inlet Water Valve 6 Remove outlet tube from inlet water valve 7 Rotate inlet water valve from inlet fitting and remove valve from machine 8 Examine the inlet screen if dirty brush off screen Note Screen is not replaceable and may only be removed by taking off the covering bracket The bracket forms part of the inlet water system and must be water tight to the valve body removal is not recommended 9 Reverse to reassemble January 2003 Page 23 SCE275 Additional Maintenance Bin Controls The bin controls use a system of infrared emitting and receiving components to sense the build up of ice in the bin They are located in between the evaporators They must be free of mineral build up to function properly To check 1 Remove the right front grill 2 Push a
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