cu50 service man.vp
Contents
1. 4273 166 1508 218 lt gt 616 l1 60571 63 14179 115 4182 167 gt 1480 219 606 12 7 58732 64 13823 116 4093 168 1453 220 597 13 56995 65 13476 117 4006 169 1427 221 gt 587 14 55296 66 13139 118 gt 3921 170 1401 222 578 15 53053 67 12812 119 3838 K iss 1375 223 569 16 52065 68 12494 120 3757 172 1350 224 gt gt 560 17 50529 69 gt 12185 121 3678 173 gt 1326 225 gt 551 18 49043 70 gt 11884 122 ee 3601 174 1302 226 543 19 47607 71 11392 123 3926 175 gt 1279 227 gt 534 20 46217 72 11308 124 3452 176 gt lt 1256 228 526 21 44872 Jas 11031 125 3381 177 1234 229 518 22 43571 74 10763 126 3311 178 1212 230 gt gt 510 23 42313 75 10502 127 3243 179 1190 231 502 24 41094 76 10247 128 3176 180 1169 232 495 25 39915 77 10000 129 3111 18 1149 233 487 26 38774 78 9760 130 3047 182 1129 234 480 27 gt gt 37669 79 9526 131 2985 183 1109 235 472 28 36600 80 9299 132 2924 184 1090 236 gt gt 465 29 35564 81 9077 133 gt 2865 185 1071 237 458 30 34561 82 8862 134 gt 2807 186 1052 238 451 31 33590 83 8652 1352. 2751 187 1034 239 444 32 gt 32649 84 8448 136 gt gt 2696 188 1016 240 438 33 31738 85 8250 137 2642 189 998 241 431 34 30855 86 8056 138 2589 190 981 242 425 35 30000 HI 7868 139 2537 191 965 243 gt gt 419 36 29171 88 7685 140 2487 192 948 244 412 37 28368 89 7507 141 2438 193 932 245 406 38 27589 90 7333 142 2390 194 916 246 400 39 26835 91 7164 143 2343 195 901 247 gt 394 40 26104 92 6999 144 2297 196 gt 885 246 gt 389 41 25395 93 6839 145 2252 197 871 249 383 42 24707 94 6683 146 2208 198 856 250 377 43 24041 95 6530 147 2165 199 842 44 gt 23394 96 6382 148 2123 200 828 45 22767 07 6238 149 2082 201 814 46 22159 98 6097 150 2042 202 800 47 21569 99 5960 151 2003 203 787 48 20997 100 gt 5826 152 1965 204 774 40 20442 101 5696 153 gt 1927 205 e 761 50 19903 102 5569 154 1890 206 749 4 1938 103 5446 53 1952 207 737 March 2010 Page 23 CU50 Service Manual Service Diagnosis No Ice Problem Likely Cause Probable Solution Check breaker or fuse Reset or No power to unit Power disconnected
3. reservoir Pour Scale Remover Here 5 Operate the machine for about 1 2 hour 6 Push and release the On Off switch The machine will begin to flush out the cleaning solution 7 Operate the machine for another 1 2 hour 8 Push and release the On Off switch The machine will stop the cleaning process March 2010 Page 16 CU50 Service Manual System Information Overall e Refrigerant 8 oz R 134a e Compressor Hermetic 1300 e Condenser Forced draft e Fan blade 5 blade 7 inch Evaporator Inverted 24 cube cells Copper cups attached to continuous serpentine Metering device Cap tube e Defrost method Hot gas bypass with water assist e Spray method 6 water jets e Water charge 40 ounces e Water valve 115 volt solenoid 19 GPM e Water fill time Varies with harvest time amp purge setting e Spray pump Pedestal type e Drain pump Magnetic drive controlled by pressure switch e Purge method Overflow standpipe Control method Electronic e Cycle control Thermistor timers e Freeze cycle timer 10 minutes 4 Harvest cycle timer 20 seconds 40 e Cube size adjustment Freeze timer change Harvest cycle adjustment Harvest timer change e Bin control Thermostat Opens on temperature fall Cut Out 35 degrees F Cut In 45 degrees F Range is adjustable Electrical Components e Compressor e Fan motor e Spray pump motor e Drain
4. Disconnect the incoming water line at the inlet water valve 6 Open the door push and release the on off switch to turn the machine on 7 Blow air through the inlet water valve a tire pump could do the job 8 Drain pump models should have about 1 2 gallon of RV antifreeze propylene glycol poured into the ice storage bin drain Note Automotive antifreeze must NOT be used 9 Switch off and unplug the machine March 2010 Page 15 CU50 Service Manual How to remove scale from the ice making system 1 Scoop out all of the ice either discard itor save 9 Pour a gallon of hot 95 F 115 F water into it in an ice chest or cooler the bin to flush out the drain 2 Press and HOLD the On off button in for 3 10 Clean the bin liner of mineral scale by mixing seconds until the Green light goes out some ice machine scale remover and hot water and using that solution to scrub the scale off of the liner 11 Rinse the liner with hot water 12 Sanitize the bin interior Press and HOLD the both the Clean Reset and 43 Replace the ice removed in step 1 On Off buttons for 5 seconds The Time to Clean light will blink on and off 14 Push and release the On Off button to restart ice making 4 Pour 8 ounces of Scotsman Ice Machine Scale Remover available from a local Scotsman The ice scoop should be washed regularly wash it Distributor or Dealer into the ice machine just like any other food container
5. replace restart and check No power to controller Transformer open Replace transformer Shut down on maximum water fill time water light Water shut off Restore water supply flashing Water leak Check curtain sump Dirty condenser Restricted location intake air too Eliminate restriction have machine hot or blocked moved Evaporator thermistor not sensing Very long freeze cycle Spray jets dirty bie platform and clean Inlet water valve leaks through Check inlet water valve during freeze Low on refrigerant Check cube formation Check for bleed thru from missing Connected to hot water check valve in building water supply Spray pump not pumping Check pump motor Check fan motor check fan blade Fan motor not turning check controller for voltage output Pump hose disconnected Check hose Add access valve add refrigerant Very low on refrigerant as a test If unit makes ice find and correct leak Check compressor start components check PTCR resistance and temperature Check compressor voltage Check compressor windings Hot gas valve leaks through during Check hot gas valve for hot outlet freeze during freeze Check compressor amp draw if low and all else is correct change compressor Cannot make ice Compressor not operating Compressor inefficient March 2010 Page 24 CU50 Service
6. Manual Service Diagnosis Makes excessive noise Likely Cause Probable Solution is bent fan blade Fan blade vibrates Een motor mountis broken motor mount is broken Replace motor mount motor mount Compressor vibrates Mounting loose Check mounting Water pump vibrates Pump bearings worn pump Panels vibrate Mounting screws loose Tightenscrews 0 0 000 Screws Makes ice does not harvest Problem Likely Cause Probable Solution Ice wrong size Environment changed Adjust cube size Check voltage to coil when unit is Hot gas valve does not open in harvest check controller indicator light Little heat to evaporator Water temperature very low Adjust harvest time Fan motor does not stop Check voltage replace controller Makes poor quality ice Problem Likely Cause Probable Solution Spray pattern poor Spray jets dirty Clean jets Runs out of water Water leaking from reservoir Correct leak High TDS water supply Groundwater supply Treat water Makes ice but melts rapidly Problem Likely Cause Probable Solution Restricted drain Gravity drain hose has air block Check for kinks or traps Pump model switch not starting Check replace switch pump Pooled water in bin March 2010 Page 25 CU50 Service Manual Removal and Repair Bin Thermostat 1 Disconnect electrical power AWARNING Electrical Shock Haza
7. as a temporary means of system access After diagnosis and before final repair replace the clamp on type valve with valves that are brazed onto the process tubes of the system Use a low flow of dry nitrogen when brazing on the system Install a new filter drier when replacing a refrigeration component or after a refrigerant leak repair Evacuate the system to at least 300 microns and use a micron gauge to measure the evacuation level Weigh in the nameplate charge The machine is critically charged and a partial ounce mis charge will affect performance March 2010 Page 30
8. pump motor e Drain pump switch e Inlet water solenoid valve e Hot gas valve Transformer e Controller e Water sensor e Thermistor Bin thermostat Electrical Sequence A closed bin thermostat signals to the controller a need for ice The controller checks for water if water is needed the controller opens the inlet water solenoid valve to fill the reservoir The hot gas valve is open to equalize the system When the reservoir is full the compressor fan motor water pump are switched on After 5 seconds the hot gas valve shuts and ice making begins Water is sprayed up into the inverted cup mold As the water is cooled and ice begins to form in the cups the temperature of the evaporator will fall The freeze cycle continues until the temperature of the thermistor attached to the evaporator outlet tube falls to about zero degrees F At that point the controller starts a freeze cycle timer whose default time is 10 minutes At the end of the freeze cycle s timed portion the controller switches to the harvest cycle The harvest cycle begins with the controller stopping the water pump and fan motor At the same time it opens the hot gas valve and the inlet water solenoid valve The ice is released by the combination of discharge refrigerant gas entering the evaporator serpentine and warming up the copper plus the inlet water that flows to the evaporator floods across the plastic platen to warm it up and be pre chilled f
9. shut off immediately push and hold the On Off button in until the machine stops What shouldn t be done Never keep anything in the ice storage bin that is not ice Objects like wine or beer bottles are not only unsanitary but the labels can slip off and plug up the drain Never allow the machine to operate without regular cleaning The machine will last longer if it is kept clean Regular cleaning should happen at least once per year and preferably twice Some water conditions will dictate even more frequent cleaning of the ice making section and some carpets or pets will dictate more frequent cleaning of the condenser Note The Time to Clean light will switch ON after 6 months of use It will remain ON until the ice making system is cleaned using the process on page 13 Noise The ice machine is designed for quiet operation but will make some noise during the ice making cycle During a freezing cycle it is normal to hear the fan moving air and the water pump circulating water Ice hitting the bin or ice in the bin can be heard during harvest Normal cubes are tapered cylinders If the cubes are ragged and mis shaped mineral scale must be removed from the ice making system Maintenance There are 5 things to keep clean 1 The outside cabinet amp door 2 The ice storage bin 3 The condenser 4 The ice making system 5 The ice scoop How to clean the cabinet Wipe off any spills on the surface of
10. the door and handle as they occur If anything spilled on the door or gasket dries onto the surface wash with soap and warm water to remove How to clean the ice storage bin The ice storage bin should be sanitized occasionally It is usually convenient to sanitize the bin after the ice making system has been cleaned and the storage bin is empty A sanitizing solution can be made of 1 ounce of household bleach and two gallons of hot 95 F 115 F water Use a clean cloth and wipe the interior of the ice storage bin with the sanitizing solution pour some of the solution down the drain Allow to air dry March 2010 Page 14 CU50 Service Manual How to clean the condenser and winterize Condenser cleaning The condenser is like the radiator on car it has fins and tubes that can become clogged with dirt and lint To clean 1 Remove the kickplate and front service panel 2 Locate the condenser surface 3 Vacuum the surface removing all dust and lint Caution Do not dent the fins 4 Return the kickplate and front service panel to their original positions Fasten them to the cabinet using the original screws Winterizing 1 Clean the ice making system 2 Open the door and push and release the On Off switch to turn the machine off 3 Turn off the water supply 4 Drain the water reservoir by removing the rubber cap under the reservoir it s near the back wall of the ice storage bin 5
11. the unit each cycle Between 1 and 3 5 pints of that rinses the reservoir and goes down the drain Some impurities will inevitably remain and will stick to the parts in the machine and will cause malformed ice cubes Eventually built up mineral scale can shorten machine life To keep the machine operating properly these impurities or minerals will have to be regularly dissolved by an acid cleaning using Scotsman Ice Machine Scale Remover Directions for this may be found in the section under cleaning Filters and Treatment In general it is always a good idea to filter the water A water filter if it is of the proper type can remove taste and odors as well as particles Some methods of water treatment for dissolved solids include reverse osmosis and polyphosphate feeders RO Water This machine can be supplied with Reverse Osmosis water but the water conductivity must be no less than 10 microSiemens cm A reverse osmosis system should include post treatment to satisfy the R O water s potential aggressiveness Deionized water is not recommended and is too clean to allow the machine to function Because water softeners exchange one mineral for another softened water may not improve water conditions when used with ice machines Where water is very hard softened water could result in white mushy cubes that stick together If in doubt about the water contact a local point of use water specialist for recommendations o
12. 30 31 70 28 29 26 27 60 25 26 24 25 50 19 20 19 20 40 Ice per cycle 1 Ib Water drained cycle Varies by harvest cycle 19 18 19 length and purge setting Typical amounts are 70 50 52 oz 90 70 13 oz Compressor amps 2 6 3 2 March 2010 Page 21 CU50 Service Manual Refrigeration System Suction Pressure PSIG Discharge Pressure 150 40 130 120 100 PSIG 90 80 70 60 50 Time March 2010 Page 22 050 Service Manual Thermistor Values Deg E Ohms Deg E Ohms Deg Ohms Deg F Ohms Deg Ohms 0 85325 52 18873 104 5325 156 1819 208 724 le 82661 S3 18381 105 5208 157 1785 209 gt 713 2 80090 54 17903 106 5093 158 1752 210 701 3 77607 55 17439 107 4981 159 1719 211 690 4 75210 56 16988 108 4872 160 1687 212 679 5 72896 57 16551 109 gt 4766 161 1655 213 gt 668 6 70660 58 16126 110 4663 162 1624 214 657 7 68501 59 15714 111 4562 163 1594 215 646 8 66415 60 15313 112 4463 164 gt 1565 216 636 9 64400 61 14924 113 4367 165 gt 1536 217 gt gt 626 10 62453 62 14546 114
13. CU50 Service Manual Introduction This ice machine is the result of Scotsman s decades of experience as an industry leader in the design and manufacture of both commercial and residential ice machines This manual includes the information needed to install start up maintain and service the ice machine Note any Caution or Warning indicators as they provide notice of potential hazards Keep this manual for future reference Table of Contents Specifications Cabinet Layout Air flow Water Quality Door Door Panel Attachment Custom Door swing change Installation Water amp Drain Gravity Drain Electrical Cube Size Adjustment Harvest Time Adjustment Control Settings Use How to clean the condenser and winterize How to remove scale from the ice making system System Information WaterSystem 0 4 Components Controller Performance Information Refrigeration System Thermistor Service Diagnosis Service Diagnosis Removal and Repair Removal and Repair Removal and Repair Cabinet Removal Refrigeration Service March 2010 Page 1 CU50 Service Manual Specifications This ice machine is designed to be used ina controlled environment It can be used in a wide vari
14. e Water Schematic 1 Inlet Water Solenoid Valve March 2010 Page 18 CU50 Service Manual Components Serial Tag Location 11 T LU O Scoop and Thermostat Bracket Control Panel Bin Light and Curtain Evaporator Platen D 11 ai we uf witty unr DH Te 2 Inlet Water Solenoid Valve Condenser and Bin Thermostat March 2010 Page 19 CU50 Service Manual Controller High Voltage _ Evaporator Thermistor or gS nr A 9 50 Ph ei F Water Bin Thermostat Water Sensor K e 012 ei De Le 1 gea EZ Hot gt gat 15 H d 1 ao Connector The controller is located at the front of the unit under the top panel It is powered by a 12 volt transformer It has 5 indicator lights e Compressor Light is ON if compressor is powered e Water Light is ON if inlet water solenoid valve is powered e Hot Gas Light is ON when Hot Gas Valve is powered Fan Light is ON when Fan motor is powered e Power Light is ON when power is connected to controller eq aes AU oa el d m Control Panel Ribbon Control Safeties No Water If the Water Sensor cannot detect water and
15. e front service panel Securing Front Service Panel 2 Route the tubing through the right hole in the back to the inlet water solenoid valve inlet 3 Install compression fitting on the tubing and connect to the inlet of the solenoid Drains There are two types of ice machine models one that drains by gravity and one that has an internal drain pump Drain Pump Model drain installation 1 Locate the coil of 3 8 ID plastic drain tubing secured to the back of the unit 2 Route the plastic drain tube from the back of the unit to the drain connection point IMPORTANT NOTE Often an air gap is required by local codes between the ice maker drain tube and the drain receptacle Drain Tube Route to building drain Water Inlet Tube field supplied Back View Drain Pump Model March 2010 Page 8 CU50 Service Manual Gravity Drain Caution Restrictions in the drain system to the machine will cause water to back up into the ice storage bin and melt the ice Gravity drain tubing must be vented have no kinks and slope to the building drain Air gaps are typically required by local code 1 Place the ice machine in front of the installation opening Adjust leveling legs to the approximate height 2 Remove the front service access panel and the upper back panel Note If you are connecting a gravity drain model and the drain opening has been located in the floor unde
16. e needed After about a half hour ice will fall into the ice storage bin The machine makes 24 cubes per batch It is normal for the first batches of ice to melt that continues until the bin has cooled It will take 8 to 10 hours of continuous run time to fill the ice bin When the bin is full of ice the ice machine will shut off It will automatically restart when the ice level falls either from use or normal meltage March 2010 Page 10 CU50 Service Manual Cube Size Adjustment The cube size can be adjusted by changing the amount of freeze cycle time This is done by a Side Views of Cubes button press sequence Note There is only one correct cube size See the illustrations To adjust cube size 1 Shut the machine off If it s off on bin full press and release the On Off button once switching the Ice Making light off If the machine is making ice Too Small Adjust Cycle Longer hold the On Off button in until the Ice Making light is 011 2 Press and hold the Clean button for 5 seconds light on then release light out 3 View the lights Compare to the table below Cube Size Change Table On Off Just Right Default Add 1 minute Add 2 minutes Add 3 minutes Add 4 minutes 1 minute 2 minutes 3 minutes 4 minutes Too Large Adjust Cycle Shorter 4 Select the amount of change 5 Push and release the On Off button until the correct light pattern i
17. ety of environmental conditions and under limited conditions See user manual outdoors but there are limits Use outside of the listed limitations is misuse and will void the warranty Air temperature limits The ice machine will operate adequately within the limits but functions best in temperatures between 70 and 80 degrees F e Minimum 50 degrees 10 C e Maximum 100 degrees 38 C Water temperature limits e Minimum 40 degrees E 4 5 C e Maximum 100 degrees 38 C Water pressure limits e Minimum 20 psi 1 4 bar e Maximum 80 psi 5 5 bar Because the ice machine is making a food product the water supply to the ice machine must be potable or fit for human consumption Electrical e 115 volt 60 Hz Plug into dedicated 15 amp circuit e Power consumption 275 400 Watts Varies during Freeze and Harvest cycles Voltage limits e Minimum 104 volts Maximum 126 volts Models There are two models all air cooled e CUS50PA 1 Pump model e CUS50GA 1 Gravity drain model Options Kickplate Extension In some situations the leg levelers will be extended enough to become visible A kit to extend the kickplate over the legs is KKPF Cabinet Stability In some free standing installations it may be prudent to add a bracket that secures the back of the cabinet to a wall That kit number is KATB Drain Conversion A gravity drain model can be conve
18. he reservoir The water fill is timed There is a maximum amount of Lo time allowed from the time the controller turned on the inlet water valve until the water sensor signals Reservoir to the controller That time is 2 1 2 minutes If Drain water is not sensed within 2 1 2 minutes the controller will not proceed with an ice making cycle Instead it will blink the Water light and try filling the reservoir in 20 minutes A gt r Freeze Cycle Water Schematic Reservoir water dilution The process of making ice from circulating water causes the pure water to freeze first because it freezes at the warmest temperature The remaining water will develop an increasing concentration of minerals If that mineral concentration were allowed to continue eventually the ice machine would become coated with mineral scale errr ree e To combat the mineral build up the reservoir water is diluted with fresh water every cycle The controller adds enough water to fill the reservoir and extra water to overfill it The extra water drains out through the standpipe in the reservoir Standpipes Ee EE The controller keeps the inlet water solenoid valve open until the evaporator temperature set point is reached plus some extra time The extra time is either pre set or automatically determined by the controller Harvest Cycl
19. ility or responsibility of any kind for products manufactured by Scotsman that have been altered in any way including the use of any parts 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 designs are subject to change without notice March 2010 Page 4 CU50 Service Manual Water Quality All water including potable water supplied by municipalities contains some impurities or minerals Water absorbs impurities from the air as rain and or as it flows through the ground Some of the impurities are solid particles these are known as suspended solids and a fine particle filter will remove them Other impurities are chemically bonded to the water molecules and cannot be filtered out these are called dissolved solids Ice made by this machine will have a lower mineral content than the water it was made from This is due to the method of making ice Purer water will freeze first in the ice making molds The reason for this is that anything dissolved in water lowers the water s freezing temperature This concentrates most of the impurities in the ice machine water reservoir where they may form hard deposits known as scale The machine dilutes the concentration of minerals by over filling the reservoir during the harvest cycle with the excess water flowing down the drain Between 2 and 4 pints of water flow into
20. move top panel 3 Remove controller box cover 4 Unplug all connections 5 Remove screws holding controller to housing and lift controller from unit Note To avoid damaging the controller touch the metal chassis of the unit prior to touching the replacement controller 6 Reverse to reassemble Control Panel 1 Disconnect electrical power 2 Remove top panel 3 Remove controller box cover 4 Unplug ribbon cable connection 5 Push control panel away from the front of the machine Begin at the ribbon cable attachment point Note Control panel is held on by adhesive and the adhesive is thinnest at the cable point 6 Separate control panel from controller box and remove from the ice machine 7 Reverse to reassemble March 2010 Page 2 CU50 Service Manual Removal and Repair Cabinet Removal Certain components require the removal of the cabinet for repair access 1 If the machine is in a freeze mode perform a manual harvest 2 Remove all ice 3 Drain reservoir 4 Remove service panel and kick plate 5 Remove back panel 6 Disconnect electrical power AWARNING Electrical Shock Hazard Disconnect electrical power before beginning removal 7 Disconnect water and drain tubing 8 Remove door 9 Remove top panel 10 Remove controller box cover 11 Disconnect thermistor from controller pull wire back to suction line Thermistor Connect
21. n water treatment Installation Overview The ice machine must be connected to cold potable water be connected to a drain be connected to the proper power supply be able circulate air through the vents at the front Note Do not build in so that the door is recessed March 2010 Page 5 CU50 Service Manual Door swing change The door can be attached to open with hinges on 6 Remove original bottom hinge the left or right Retain all screws for re use To change 1 Remove top hinge pin from hinge 7 Remove two plugs or screws from upper cabinet bracket 8 Attach bottom hinge to upper cabinet bracket using the original screws 9 Place the door on bottom hinge tip up to slide under top hinge 2 Tilt top of door away from cabinet and lift door off bottom hinge 10 Insert hinge pin into top hinge and door 11 Tighten hinge pin 12 Replace screws or plugs into holes left by hinges 13 Check action and swing of door 3 Remove two screws and top hinge 4 Remove plugs or screws from lower cabinet bracket 5 Attach top hinge to lower cabinet bracket using original screws March 2010 Page 6 CU50 Service Manual Installation Notes Sealing to floor In some cases the base of the ice machine must be sealed to the floor to meet local code Food grade silastic sealant such as Scotsman part number 19 0529 01 is recommended Place the machine in the intended l
22. ocation Turn the leg levelers in until the bottom of the unit is as close to the floor as possible Be sure the unit is level and all four levelers are in contact with the floor Place a bead of the sealant between the floor and the outside edge of the cabinet The bead must fill the space between the cabinet bottom edges and the floor Built In Situations If a finished floor is to be installed in the area after the ice machine has been built in shims the expected thickness of the floor should be installed under the unit to keep the machine level with the planned floor level Installations on a slab Use a pump model and pump the water to the point of drainage Pump models will pump 1 story 10 feet high Installations over a crawl space or basement Either gravity drain or pump model units may be used if there is not enough room behind the machine for a drain waste receptacle the drain will have to be below the floor Note When installed in a corner the door swing may be limited due to handle contact with the wall or cabinet face March 2010 Page CU50 Service Manual Installation Water amp Drain The recommended water supply tubing is 74 inch OD copper Stainless steel flex or reinforced PVC tube may also be used Install an easily accessible shut off valve between the supply and the unit This shut off valve should not be installed behind the unit Note Do not use self piercing type valves 1 Remove th
23. or p o SE Geess 12 Remove curtain amp hanger 13 Locate elbows where water flows onto the evaporator platen Clip 14 Pull clip up Push inner elbow back and rotate it until it points straight up then push it back through the hole in the back of the freezing compartment 15 Pull water inlet elbow out of inner elbow March 2010 Page 28 050 Service Manual 18 Remove two screws holding freezing 23 Lift bin assembly off the base compartment brace to cabinet lift brace up Note Prop evaporator assembly up A 3 length of 3 4 PVC tubing with one end inserted into the cup mold and the other against the base will hold it up The hot gas valve fan motor condenser and compressor are now exposed for service 19 Lift evaporator platen up and tilt back enough for bin assembly to clear the base Ramie OCW te 1004 We bel at i _ geeky D 20 Remove air baffle 21 Unplug 7 wire harness connector at back of bin 22 Remove 1 screw at each corner of the base l Chassis Shown in Front of Bin Assembly March 2010 Page 29 CU50 Service Manual Refrigeration Service This ice machine use R 134a type refrigerant There are specific rules for handling that refrigerant To check for system pressures add a field supplied clamp on type service valve
24. or the next cycle Ice cubes drop individually and harvest continues until the thermistor attached to the suction line warms up to about 50 degrees F At that point a harvest timer starts whose default time is 20 seconds At the end of that time the harvest cycle ends and the freeze cycle restarts Bin control The machine s on and off modes are regulated by a bin thermostat The cap tube for the bin thermostat is in the tube that holds the scoop The machine will only begin ice making when the thermostat s contacts close If the contacts re open before the temperature of the evaporator drops below a preset point the machine will stop If the temperature is below that point when the contact 5 open the machine will continue through a complete cycle and stop at the end of the harvest cycle March 2010 Page 17 CU50 Service Manual Water System The controller uses a Water Sensor to check for the presence of water in the reservoir and to measure the conductivity of the water The water sensor consists of two stainless steel probes located in a holder next to the water pump The probes sense the conductivity of the water The higher the mineral content of the water the better it can conduct electricity The control system Pump is capable of sensing water as clean as 10 microSiemens cm If the controller cannot sense water and the bin thermostat is closed the controller will power the inlet water solenoid valve to fill t
25. ower and ground wires from pump motor 4 Rotate pump body CW and lift up to remove it 5 Reverse to reassemble March 2010 Page 26 CU50 Service Manual Removal and Repair Evaporator Thermistor Note If unit is built in it must be pulled out to change the evaporator thermistor AWARNING Electrical Shock Hazard Disconnect electrical power before beginning removal 1 Shut machine off If unit was making ice manually harvest the ice 2 Disconnect electrical power 3 Remove top panel 4 Remove cover from controller box 5 Disconnect thermistor wire from controller 6 Locate thermistor sensor it is attached to the suction line just above the accumulator and is covered with insulation tape Remove the insulation 7 Disconnect sensor bulb from suction line it s held on with a metal clip 8 Remove thermistor from ice machine 9 Reverse to reassemble It is very important that the bulb be re insulated Transformer Note If unit is built in it must be pulled out to change the transformer 1 Disconnect electrical power 2 Remove top panel 3 Remove controller cover 4 Unplug leads from transformer 5 Remove screws holding transformer to controller box and pull transformer up and out of the ice machine 6 Reverse to reassemble Controller Note If unit is built in it must be pulled out to change the controller 1 Disconnect electrical power 2 Re
26. r the base pan according to the pre install specifications follow steps 3 through 5 to drain the unit through the base If not proceed to step 6b 3 Remove the clamp and barbed elbow and take off the plastic cover in the base pan below the drain hose 4 Connect a straight 5 8 barbed connector to the drain hose securing with the clamp removed in step 4 5 Cut an 8 piece of 5 8 ID 7 8 OD tygon clear plastic tubing Slide one end of the tube onto the outlet of the barbed connector and secure with a clamp Leave the other end of the tube lying on the floor of the base pan until the unit is positioned over the floor drain 6 Route the drain tube Either a Insert the drain tube through the base pan into the floor drain or b Route the drain tube through the left hole in the lower back panel and connect to barbed elbow and secure with a clamp 7 Reinstall the upper back panel 8 Reinstall the service access panel Level the unit Drain Hose Drain Hose Route to building drain Barbed Elbow Water Inlet Tube field supplied Back View Gravity Drain Model March 2010 Page 9 CU50 Service Manual Electrical The ice machine is supplied with a power cord Do not remove the grounding from the cord s plug Do not use extension cords Follow all codes Connect the machine to its own 115 volt 15 amp circuit 1 If the electrical outlet for the ice maker is behind
27. rd Disconnect electrical power before beginning removal 2 Remove service panel 3 Remove back panel Note If unit is built in it must be pulled out to change the bin thermostat 4 Pull cap tube out from the back of the ice storage bin and cap tube holder 5 Remove two screws and the bin thermostat contact section from its mounting bracket 6 Disconnect two wires from the bin thermostat contact section and remove the thermostat from the ice machine 7 Reverse to reinstall Inlet Water Solenoid Valve 1 Disconnect electrical power 2 Remove service panel 3 Shut water supply OFF 4 Disconnect inlet water supply tube from inlet water solenoid valve 5 Unplug wire harness from valve coil 6 Remove two screws holding valve to chassis 7 Squeeze hose clamp larger and push away from solenoid valve outlet 8 Pull hose from outlet of valve 9 Reverse to reassemble Curtain 1 Shut unit off 2 Loosen both thumbscrews holding curtain bracket to freezing chamber 3 Pull out and remove curtain with bracket from ice machine 4 Reverse to reassemble Spray Platform 1 Remove curtain 2 Lift spray platform up until it disconnects from its fitting 3 Pull forward and remove from the ice machine 4 Reverse to reassemble Water Pump 1 Remove spray platform 2 Remove back panel Note If unit is built in it must be pulled out to change the water pump 3 Disconnect p
28. rted to a drain pump model by installing a drain pump kit The drain pump kit consists of a drain pump wiring harness and associated tubing The kit number is A39462 021 Warranty Information Warranty information is supplied separately from this manual Refer to it for coverage In general the warranty covers defects in materials or workmanship and does not cover corrections of installation errors or maintenance March 2010 Page 2 CU50 Service Manual Cabinet Layout 1 7 377 95 ees 14 88 SZ LT FF Pa A e es or Tam 0 1 LEG m E ADJUGENT 25 40 Kap MOED HE DATIV MODED IO EIN OBAE INCE TZOMP wl E OW 77 IER 1 00 ees 2010 3 CU50 Service Manual Air flow The machine takes in room temperature air at the lower right front and forces warm air out the lower left front Restricting the airflow will adversely affe the ability of the ice machine to make ice Warm Air Out Ap Intake Scotsman Ice Systems are designed and manufactured with the highest regard for safety and performance They meet or exceed the standards of agencies like U L ct Control Panel Scotsman Jpm Ice Making Area Scotsman assumes no liab
29. s displayed 6 Push and release the Clean button to select that setting 7 Push and release On Off to return to ice making March 2010 Page 11 CU50 Service Manual Harvest Time Adjustment The harvest time can be adjusted so that all the Harvest Time Table harvests during the cycle plus a few seconds extra This is done by a button press sequence On Off Note Do not set harvest time shorter than the eau off actual time it takes to release all the cubes Add 10 seconds Add 20 seconds off To adjust Harvest Time Add 30 seconds off 1 Shut the machine off by holding the On Off Add 40 seconds on button in until it shuts off Ice Making light off 10 seconds flash 2 Press and hold the On button again for 5 20 seconds off seconds then release ce Making light will switch off 30 seconds off 40 seconds flash 3 View the lights Compare to the table below 4 Select the amount of change 5 Push and release the Clean button until the correct light pattern is displayed 6 Push and release the On button to select that setting 7 Push and release On Off to return to ice making Ice Making Check Water Indicator Light Indicator Light Scotsman CU50 Clean Reset On Time To Button Button Clean Unit Indicator Light Control Panel March 2010 Page 12 CU50 Service Manual Control Settings Automa
30. the inlet water solenoid valve has been on for the maximum fill time the controller will stop all action and wait 20 minutes to re try water fill During this time the Check Water light on the control panel will be blinking Maximum Freeze Time If the freeze cycle should extend to 60 minutes the controller will automatically put the machine into a Harvest cycle Maximum Harvest Time 6 minutes Time between restarts After the machine has operated and then turned off the controller will not restart the machine for four minutes March 2010 Page 20 050 Service Manual Performance Information Freeze Cycle Minutes Air Temperature 80 70 Water Temperature Harvest Cycle Seconds 100 34 35 32 33 90 33 34 31 32 80 30 31 28 29 70 27 28 25 26 60 24 25 22 23 50 18 19 17 18 40 16 17 15 16 Air Temperature 100 90 80 70 60 50 Water Temperature 80 100 55 60 60 0 70 80 80 90 90 100 110 115 70 80 65 5 70 80 75 85 85 95 95 105 115 120 50 70 70 80 75 85 85 95 125 135 140 150 160 170 40 50 Total Cycle Minutes 100 120 115 125 130 140 150 170 Air Temperature 180 200 210 230 80 70 Water Temperature 100 36 37 34 35 90 35 36 33 34 80 31 32
31. the unit plug in the unit 2 Position the unit in the installation opening Turn the water supply Make sure that the ice maker is plugged in and the power is on 4 Slide unit into installation opening paying careful attention to water supply and drain connections Do not kink 5 Pour a couple of quarts of water into the ice storage bin on drain pump equipped machines the drain pump should start and water should pump out Check for leaks 6 Replace the service access panel 7 Level the unit as needed Installation check list 1 Has the unit been connected to the proper water supply 2 Has the water supply be checked for leaks SS Has the unit been connected to a drain gt Has the drain been tested for flow and leaks Has the unit been connected to the proper electrical supply 6 Has the unit been leveled 7 Have all packing materials been removed from the machine 8 Has the door covering been installed Initial Start Up 1 Turn the water supply 2 Switch on the electrical power 3 Push and release the On Off switch to start the machine The Ice Making light next to the On Off switch will glow Green 4 Water will begin to flow into the unit When the reservoir is full water will start to drain from the machine After a few minutes the compressor water pump and fan motor will begin to operate and the first ice making cycle will have begun No adjustments ar
32. tic water purge enable disable The control is set at the factory to automatically select the proper amount of water purge If desired that can be disabled and a typical purge amount used To disable Automatic purge selection 1 Press and hold the On Off button until the unit shuts off No lights should be on 2 Press and hold the ON button for 5 seconds then release 3 Wait between 5 and 20 seconds then repeat step 1 All lights will flash once To return to Automatic purge selection 1 Press and hold the ON button for 5 seconds then release 2 Wait between 5 and 20 seconds then repeat step 1 All lights will flash twice Manual Harvest from the OFF or Standby Mode powered but no lights are on 1 Press and hold the Clean Reset button for 5 seconds and release 2 Wait between 5 and 20 seconds then repeat step 1 All lights will flash once The On Off light will be on until harvest has timed out Reset time to clean indicator light Press and hold the Clean Reset button for 3 seconds March 2010 Page 13 CU50 Service Manual Use No special instructions are needed for use Just take as much ice as you need the machine will replace it A scoop is provided and it can be stored in the machine using the loop of tubing on the right side as a holder The machine can be shut off anytime by just pushing and releasing the On Off button The machine will shut off at the end of the next cycle To
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