Service Manual - SLC300

SLC300IntroductionTo the owner or user: This service manual is When harvested, the cubes fall individually into theintended to provide you, and the maintenance or ice storage bin. The SLC300 automaticallyservice technician, with the information needed to maintains the level of ice by turning on when theinstall, start up, clean, maintain and repair this ice level falls, and switches off when the bin is full.product. The refrigeration system uses R-502 as theThe SLC300 is an ice machine that produces refrigerant.cubed ice on 4 vertical cube freezing surfaces. Table of ContentsSpecifications page 2Limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 3Installation General . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 4 Bin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 5 SLD dispenser . . . . . . . . . . . . . . . . . . . . . . . . . . page 6 RS or IS dispenser . . . . . . . . . . . . . . . . . . . . . . . . page 7Plumbing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 8Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 9Final Check List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 10Component Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 11Initial Start Up page 12Electrical Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 13Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 14Water/ Refrigeration Schematic . . . . . . . . . . . . . . . . . . . . . . . . . page 16Technical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . page 18Service Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 19Removal and Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . page 21Parts lists and wiring diagrams are located in the center of this manual, printed on yellow paper.Note the warning symbol where it appears in thismanual. It is an alert for important safetyinformation on a hazard that might cause seriousinjury.Keep this manual for future reference.This manual was printed on recycled paper. November 1994 Page 1

SLC300 Nameplate Serial Number PlateSpecificationsInformation regarding Model Number, SerialNumber, Ampacity and Maximum Fuse Size arelocated on the nameplate of the ice machine. Themodel number, serial number and refrigerantcharge are also listed onthe serial number platejust behind the frontpanel.If recharging, alwaysuse the charge listed onthe ice machine. SLC300 Cabinet 3 3⁄4\" SLC300 Back View (Air Cooled Model Shown) 1 3⁄8\" Electrical Water 20\" Inlet InletSpecifications: 4 1⁄4\"The SLC300 will stack onto a 7⁄8\"variety of ice storage bins, see 22\"sales literature for proper icestorage bin. DrainThere is an optional stainlesssteel panel kit, SPKSLC, for thismachine.Model Number Dimensions Condenser Basic Minimum Maximum Refrigerant W\" x D\" x H\" Type Electrical Circuit Fuse Size (or Charge. R-502 Ampacity* HACR circuitSLC300AE-1E 22 x 23 x 20 15 ouncesSLC300WE-1E 22 x 23 x 20 breakers) 16 ounces Air 115/60/1 19.7 20 Water 115/60/1 18.2 20* Minimum Circuit Ampacity is used to determinewire size and type per the National Electric Code. January 1993 Page 2

For The Installer: Environmental Limitations SLC300The ice machine must be installed indoors in a SLC300controlled environment. Top View 23\"Air Temp Minimum MaximumWater Temp 550F. 1000F. 400F. 900F.Water Pressure 20 PSI 60 PSIVoltage 103.5 126.5Operating the ice machine outside of the abovelimitations, or outdoors, is potentially damaging tothe machine, and it is misuse of the machine. Thismay void the warranty.Scotsman Ice Systems are designed andmanufactured with the highest regard for safetyand performance. They meet or exceed thestandards of UL, NSF, and CSA.Scotsman assumes no liability or responsibility ofany kind for products manufactured by Scotsmanthat have been altered in any way, including theuse of any part and/or other components notspecifically approved by Scotsman.Scotsman reserves the right to make designchanges and/or improvements at any time.Specifications and design are subject to changewithout notice.Airflow on air cooled models is: •Intake through the right side grill. •Exhaust through the back. Dashed Lines Show 12\" Outline of Ice Drop Area.Bin Control Mounts toRight of Ice Drop Area. 7\" 3\" 6 1⁄2\"Do not install where this air flow is obstructed. 6\" Space Required for Air Flow (Air Cooled Only) and Utility Connections November 1994 Page 3

SLC300 LocationInstallation This ice machine may be installed in the open or under a counter. Clearance may be required at theWater sides or top beyond what’s needed to place the cabinet into position. Air cooled models take air inThe water supply for this ice machine has been in the right side and exhaust out the back. Space iscontact with many materials since it fell from the required for utility connections at the back.sky as rain. All rain is slightly acidic, and tends todissolve the materials it comes in contact with. The ice machine is NOT designed for outdoorDuring water’s journey to the ice machine, it has use. It must be installed indoors, in aflowed over and through the ground, been picked controlled environment. The air and waterup by a municipal or private pump, forced through temperatures must not exceed rated limits.a series of pipes of differing construction and mayhave been treated by the municipality providing Pre-installation:the water. 1. Inspect the place where the ice machine is to be installed. Check for:The water supplied to this ice machine will thencontain a variety of substances that will likely show •space for the cabinet,up as solids during the ice making process. These •water supply,solids are similar to those found when water is •drain availabilityboiled out of a saucepan. Only the water boils •and electrical power supply.away, and the minerals that were in the watersolidify in the pan. During ice making only the No extension cords are allowed. The building drainwater is frozen into ice, the minerals stay behind in inlet must be lower than the drain outlet of the icethe reservoir. This machine drains out some of the bin. The water supply must have a hand shut offthe water in the reservoir every cycle to minimize valve accessible when the unit is installed.the amount of minerals in the water system, butafter time the minerals will appear and have to bedissolved by ice machine cleaner, then flushedaway during the cleaning process.An ice machine is a food manufacturing plant; ittakes a raw material, in this case water, andtransforms it into a food product, ice. The purity ofthe water is very important in obtaining pure iceand in maximizing product life.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 adimension of 5 microns or less. The finer the filterthe better, but finer filters may plug-up sooner thancourse ones. It may be necessary to add a coursefilter ahead of the fine filter to prolong filter life.Polyphosphate feeders are usually effective inmany water conditions.Have the water tested. Acidic water or alkalinewater will both cause corrosion. Dissolved solidscannot be filtered out. Softened water is notrecommended. Never use de-ionized water.Reverse-osmosis water must be treated withbuffering agents before use in the ice machine.Check with a water treatment specialist regardingtesting, treatment and filters.January 1993 Page 4

SLC300Installation: Ice Storage Bin Stacking:Assembly: This machine will stack onto any SLC300 or SLC400. Note: Do not use casters when stacking.1. Attach the legs, or optional casters, onto the icestorage bin. Units that are stacked should only use 1. Remove and discard the left top panel from thelegs, not casters. lower unit.2. Be sure that the top edge of the bin has a good 2. Remove knock out plug from top right panel.gasket on it. 3. Place gasket material around the top of the3. Place the ice machine onto the storage bin. bottom unit’s cabinet & evaporator compartment.4. Line up the ice machine, check that there is a 4. Carefully lift the uncrated top unit onto thegood seal between the ice machine and the bottom unit. Use of a mechanical lift isstorage bin. recommended for this step.5. If on a Scotsman bin, attach the ice machine to 5. Align the two ice maker cabinets.the bin using the straps and bolts shipped with theice machine. Drill two 1/8\" holes in the back of the 6. Secure the top unit to the bottom one with thebin and secure with sheet metal screws provided. hardware and straps shipped with the upperIf on another brand bin, follow the directions machine.included with that bin. 7. Locate and uncoil all of the bin thermostatBin Thermostat Installation: capillary tube.1. Remove thermostat bracket from package. 8. Route the bin thermostat capillary tube from the upper unit, through the hole in the base, through2. Attach the bin thermostat bracket to the bottom the lower unit and into the bin thermostat bracket.of the ice machine using the thumb screws Discard upper unit bracket.provided. There are pre-drilled and tapped holeslocated just to the right of the cube drop area. Stacking Bin Thermostat Installation Routing Hole Bin Thermostat Capillary Tube Bracket Fasten Cabinets Thermostat Together At Back Capillary Tube With Straps &3. Locate and uncoil a portion of the Screws.bin thermostat capillary tube. Routethe end of the capillary tube into the Bin Thermostatplastic tube in the base of the ice Bracketmachine (next to the compressor) andthrough the bin thermostat bracket. November 1994 Page 5 Note: SLB150: Use thermostat bracket packed with that bin.

SLC300Installation: SLD150 Hotel DispenserAssemblyThe ice machine must be placed onto the top ofthe dispenser, and the bin thermostat capillarytube routed into the bracket in the dispenser.1. Check that the dispenser has a gasket allaround the perimeter of the top, 22\" wide by 23\"deep.2. Locate the inlet hole of the thermostat bracket,and make sure that it is open.3. Place a corner post from the ice machine cartonat the front of left and right sides of the hoteldispenser top.4. Use a mechanical lift and place the ice machineonto the dispenser. The cardboard corner postsshould keep the front edge of the ice machine up.5. Remove the front panel of the ice machine.6. Locate the bin thermostat capillary tube and Bin Thermostat Capillaryuncoil about 18\" of tubing. Tube Installation7. Locate plastic tube in base of ice Route Capillary Tube Temporarilymachine, next to compressor and Through Plastic Support Machinepush the end of the capillary tube thru Tube In Base With Corner Poststhe tube, watch the capillary as it To Observe Capcomes out of the base, line it up with Tube Installationthe inlet hole of the thermostatbracket and push it into the hole.Move the cabinet of the ice machineuntil the capillary tube is goingstraight down into the inlet hole.8. Carefully remove the corner posts.9. Push the capillary tube into thethermostat bracket tube until about14\" of capillary tube is in the tube.9 Remove the hardware packagefrom the machine, remove brackets.10. At the back of the dispenser, Bin Thermostatfasten brackets to the ice machine. Bracket Mounted In11. Using brackets for templates, drill Dispenser1/8\" holes into the back of thedispenser.12. Secure brackets to the dispenserwith sheet metal screws from thehardware package.13. Follow other installationinstructions from the SLD150. January 1993 Page 6

SLC300Installation: Scotsman IS or RS DispenserAssembly: 7. From the adapter kit, place the stainless steel adapter onto the top of the dispenser. Follow allThe assembly of the ice machine onto the directions included with the kit.dispenser requires two additional parts: an adapterkit and a thermostat stand off kit. 8. After the ice machine has been placed on the dispenser, remove the front panel and uncoil all of1. Mark two spots on the inside left liner of the the bin thermostat capillary tube.dispenser: 2\" down from the top, 4\" from the back,and 4\" apart. 9. Route the capillary tube thru the front hole in the base of the ice machine, to the left side if the2. At the two marked spots, drill two 1/4\" holes thru dispenser towards the stand offs.the plastic liner only. 10. Route the end of the capillary tube thru the3. From the stand off kit, locate the stand offs and stand offs, bend the tube around the stand offs soplastic anchors. Thread the stand offs partially into that it does not fall off.the plastic anchors. 11. Check that the routing of the capillary tube is4. Push the anchors/stand offs into the holes. away from the ice chute and up high near the base of the ice machine.5. Screw the stand offs all the way into theanchors. Be sure that the holes in the stand offsare horizontal.6. Place a bead of silastic (from the kit) around thestand offs. Installation of Bin Thermostat Capillary Tube Route Capillary Tube Through Front Plastic TubeK1 Kit Adapter RS or IS DispenserStand Offs From Kit K6 Route Capillary Drill 2 Holes For Tube Through Stand-Offs: 2\" From Top Of Stand Offs Dispenser & 4\" From Back & November 1994 4\" Apart Page 7

SLC300Installation For The PlumberSupply: Traps in the bin drain line without vents ahead of them will cause poor draining.Screw the 3/8\" male flare (fitting shipped inpackage inside cabinet) into the 1/4\" FPT fitting at The bin drain must be vented if there is a longthe back of the cabinet (thread tape horizontal run (5’ or more). The reservoir drainrecommended). Connect cold potable water to the must be vented and not connected to the binwater inlet. A hand shut off valve for inlet water drain. All drains are gravity, and must have ashould be installed near the machine. A water filter minimum fall of 1/4\" per foot of horizontal run.is recommended. Flush the water line prior toconnecting to the ice machine. Water Cooled: The water cooled condenser drain is not vented, and is routed separately.If water cooled, connect a separate water inlet lineto the water cooled condenser inlet fitting. It should Maintain the air gap required by local codealso have a hand shut off valve. between the end of the drain tubes and the building drain receptacle.Drains: Note: Drain tubing should be insulated to preventConnect a drain tube to the reservoir drain fitting at condensation from forming on the tubing.the back of the cabinet. The drain tube from thefitting must be run separately from any other drain CONFORM TO ALL LOCAL CODEStube. The reservoir drain is a 3/4\" F.P.T. brassfitting.Drain tube material must be rigid and meet localcode. 3/8 Male Flare 3/8\" FPT Inlet Water Inlet Water Cooled Condenser Plumbing Water Shut Connections Off Valve 1/2\" FPT Reservoir Drain Outlet3/4\" FPT, Must Be Vented. Ice Storage Bin (Typical)Bin Drain. May Be Routed From Water Supply and Drain Connections The Bottom On Some Model Bins. Fitting May Be Plastic. January 1993 Page 8 DO NOT OVERHEAT.

SLC300Installation For The ElectricianThis unit must be on a separate 115 volt AC 60 Follow All Local Codes - This Unit Must Becycle single phase power supply. The maximum Grounded. Usually a licensed electrician will befuse size for this circuit is listed on the nameplate, required to connect the electrical service.and per the nameplate use fuses, or HACR circuitbreakers.To make the electrical connections:1. Remove the right top panel.2. Remove the junction box cover.3. Make the electrical connections to the wires inthe junction box. A ground screw is provided in thejunction box.Hand Disconnect Switch Junction Box November 1994 Page 9

SLC300After Utility Connections1. Level the cabinet, use the leg levelers on theend of the legs to adjust the cabinet height. (Legsshould have been installed when the bin wasunpacked).2. Wash out the bin. If desired, the interior of thebin could be sanitized. Final Check List1. Is the ice maker cabinet in a room whereambient temperatures are within the minimum andmaximum temperatures specified?2. Has the water supply been connected?3. Is the water pressure adequate?4. Have the water connections been checked forwater leaks?5. Have the drain connections been made?6. Have the drain connections been checked forleaks?7. Is the cabinet level?8. Is the ice machine connected to a 115 voltelectrical power supply and is the ice machine theonly load on that circuit?9. Has all of the shipping material been removedfrom the inside of the cabinet?10. Has the bin and cabinet been wiped clean andsanitized?11. Has the Customer Evaluation & WarrantyRegistration form been properly filled out? Checkfor correct model and serial numbers from thenameplate, then mail the completed form toScotsman.12. Has the owner/user been given the name andtelephone number of the authorized ScotsmanService Agency serving that location? January 1993 Page 10

SLC300Component Location Control Box Detail Ice SizeMany components are serviceable from the front Thermostatwithout removing the side panels. HighBehind the front panel: Pressure Cut Out • Water pump • Inlet water valve Compressor Harvest • Reservoir Relay Relay • Evaporators • Water distributor pan Bin • Ice size control adjustment Thermostat • ICE/OFF/WASH switch • Control box Ice/Off/Wash Switch Ice Thickness Control Control Box Water Distributor Bin Thermostat Pan ICE/OFF/WASH SwitchBin Thermostat Water Pump BracketWater Inlet Valve& Strainer Drain Elbow Component Location November 1994 Page 11

SLC300Initial Start UpAfter the final check list has been gone through, Ice Size Adjustmentthe ice machine may be started up. Set1. Open the water shut off valve; the inlet water Screws Cube Size Diagramvalve will open, and water will flow into the Ice Thicknessreservoir.. Probe Adjustment 1 11⁄16\"2. Switch on the electrical power. Plate:3. Remove the front panel. Up for LARGER3. Locate the ICE/OFF/WASH switch, switch Down for SMALLERit to WASH.4. The water pump will begin to pump water over Cubes Toothe evaporators. Thick5. Allow the reservoir to refill. Normal water level is Correct Size &1/8\" below the high point of the lower curve of the Shapesiphon u-tube. Cubes Too6. Switch the ICE/OFF/WASH switch to OFF. Thin7. Check the action of the siphon. The water levelin the reservoir should drop to the bottom curve ofthe U-bend (normal water level) in about 2minutes. If not, check for proper drain tubeconnections.8. Switch the ICE/OFF/WASH switch to ON.9. On air cooled models the fan motor will begin toturn, and warm air will be discharged from theback of the ice machine.On water cooled models warm water will begin toflow from the condenser drain.10. The water temperature in the reservoir willsoon be 320F., and ice should begin to form on theevaporators.11. Allow the ice machine to operate for about15-20 minutes. The ice should be fully formed andshould be harvested within a few minutes.12. After harvest, check the ice cube size.Compare a fresh cube to the diagram on theback of the front panel. If needed, adjust thecube size by loosening the two set screws andmoving the ice thickness probe plate.Move the plate down for smaller cubes and upfor larger. Re-tighten set screws.For proper operation, the ice thickness should beset to the 1 11⁄16\" diameter.The machine is designed to harvest cubes ofonly the correct thickness. January 1993 Page 12

SLC300Initial Start UpNote: If the first batch of cubes are not all uniform Electrical Sequence:discs, some ice machine cleaner should be added This describes the sequence through a completeto the reservoir. cycle. Freeze Cycle: 1. After ice has been harvested, but before new During the first part of the freeze cycle, the ice cubes begin to form, switch the ICE/OFF/WASH machine compressor, fan motor if air cooled, and switch to WASH. water pump are operating. 2. Add 4 oz. of ice machine cleaner to the Assume the bin thermostat is closed. reservoir. Allow unit to operate that way for 10 minutes.3. Switch ICE/OFF/WASH switch to OFF The ice size thermostat contact 2-3 are closed, connecting power to:4. Shut the water supply off. •The fan motor (thru relay)5. Remove the splash guard, and drain the •The pump motor (thru relay and ice/off/washreservoir by removing the drain elbow. switch.7. Replace all parts, turn on the water and moveICE/OFF/WASH switch to ICE. The next batch of The Harvest Termination Thermostat is closed, butice should be uniform. there is no power thru it.13. Check harvest. The machine will have to The ice size thermostat heater is on.harvest all of the cubes before it goes back into the Harvest:freeze cycle. In the harvest cycle, the compressor is operating,14. Check operation of the bin control circuit by and the hot gas valve is energized. The waterholding ice on the bin control tube in the bin. pump is off, and air cooled models switch the fan off.If the ice maker does not stop within 1 minute,while keeping ice on the thermostat, rotate the bin The bin thermostat is still closed.thermostat shaft counter clockwise until the ice When the ice near the ice size thermostat sensingmaker does stop. Remove the ice from the tube grows large enough to force water over thecapillary tube; the ice maker should restart within 2 sensing tube, that tube looses heat, and at 38oF.minutes. If it does not, rotate the adjusting shaft contacts 2-3 open and 2-1 close.clockwise until the machines starts. This removes power from the water pump and fan15. Replace all the panels. The ice machine is now and connects power to the relay coil. When theready for automatic operation. relay coil has power, it connects power to the: Siphon Tube Schematic •Hot gas valve coilU-Tube Adjusted The harvest termination switch is closed, andHere = No Purge power flows thru it to the relay coil. This keeps the Siphon Breaker Hole relay energized, even when the ice size thermostat switches contact position as a result of ice falling U-Tube Here = away from the sensing tube. Maximum Purge The ice size thermostat heater is on. Water Level The unit stays in the harvest cycle until the At Harvest thermodisc on the suction line warms up to 55oF., Water Level With At that time the harvest cycle is terminated, and Pump ON the unit will go back into the freeze cycle. Water Inlet Whenever there is ice on the bin thermostat, it 1/8 - 1/4 opens and stops the ice making process.Drain Outlet Elbow Bottom of Reservoir November 1994 Page 13

SLC300Maintenance, Cleaning and SanitizingCleaning Schedule: Ice Storage Bin •Scrub the outside of the cabinet once a week The interior liner of the bin is in contact with a food product: ice. The storage bin must be cleaned with soap and water. regularly to maintain a sanitary environment. Once a week cleaning with soap and water, a hot •Sanitize the bin interior once a month. water rinse and an air dry is a basic procedure. •Clean the water system and air cooled Every 30 days, the liner should be sanitized with a condenser a minimum of twice per year. If in an commercial ice machine sanitizer, according to the area of high mineral concentration in the water directions of the sanitizer, or with a solution of supply, clean water system 4 times a year. household bleach and water:Inlet Water Valve Screens 1. Mix the bleach and water using the ratio of twoIf a restriction of incoming water is suspected, the ounces of bleach to two gallons of water.screen on the inlet side of the water valve shouldbe inspected & cleaned. There is a strainer in the 2. Wipe all interior surfaces of the ice storage binwater line; the strainer screen should also be with the bleach and water.inspected for restricting minerals. 3. Allow to air dry.Air Cooled condenser (air cooled only): To Remove Scale:Remove the right side panel. 1. Mix a cleaning solution of 4 ounces of ScotsmanThe air flow thru the condenser is from front to Ice Machine Cleaner to 4 pints of warmback, so dust will build up on the fan side of the (950F.-1100F.) water.condenser fins. 2. Using rubber gloves, dip a nylon scouring padThe fan motor, bracket and part of the shroud may into the cleaning solution and scrub the scale offbe removed as an assembly: the liner.1. Unplug the fan motor. 3. After the scale has been removed, rinse all surfaces inside the bin with clean, potable water.2. Remove 3 screws at the right edge of the fanshroud. Stainless Steel Bin Liner3. Pull the assembly out the right side. The The stainless steel liner of the bin will requirecondenser fins are then visible for cleaning. periodic cleaning. Chemicals in the water supply, such as chlorine, cause brown stains to appear onThe fins of the condenser will become fouled with the surface of the stainless steel parts.dirt, and must be cleaned. A vacuum cleaner with asoft brush attachment will extract most loose dust 1. General Cleaning - staining is usually removedstuck to the surface of the condenser fins.. by washing the parts with ordinary cleaning powder such as Bon-Ami or Copper-Glo andWater cooled units: water. After cleaning, rinse with clear water.The water cooled condenser may, over time and 2. Water treatment. The chlorine enters theunder certain water conditions, become internally machine from the municipal water supply. It can berestricted by minerals. These will have to be removed from the water supply by using adissolved by acid or the condenser replaced. Only charcoal or activated carbon water filter to treat thea qualified service agent should attempt this type water to the ice machine. If staining is severe,of service. filters of this type are recommended. Exterior Cabinet Cleaning: The exterior cabinet may be cleaned by scrubbing with soap and water. Do not use cleaners containing petroleum products. A nylon type brush may be used to scrub stubborn deposits.January 1993 Page 14

SLC300Cleaning: Ice Machine Water SystemDissolve and Remove Minerals: 15. Shut the water supply off by pushing the water valve button in.1. Remove front panel. 16. Drain the water from the sump by removing the2. Move the ICE/OFF/WASH switch to OFF. drain elbow.3. Remove the splash guard. Sanitize:4. Shut the water supply off by pushing the water 17. Remove the water distributor pan.valve button in. 18. Mix a sanitizer solution of 1 ounce of5. Drain the water from the sump by removing the household bleach to 2 gallons of warm (95oF. -drain elbow. 115oF.) water6. Disconnect hose from the water distributor pan, 19. Wash the splash guard and the waterand remove the water distributor pan. distributor pan with the solution of sanitizer. Allow to air dry.7. Mix a solution of 5 oz. ice machine cleaner and1 gallon of warm (95oF. - 115oF.) water. 20. With the sanitizer solution, wash the refrigeration tubing, liner, evaporators, supportScotsman Ice Machine brackets and water pump assembly; use the brushCleaner contains acids. and/or a clean cloth.These compounds maycause burns. 21. Replace the water distributor pan and splashIf swallowed, DO NOT guard. Be certain that the hose to the waterinduce vomiting. Give distributor pan is tightly connected to the pan, andlarge amounts of water or that the flow washer in the hose is not in sideways.milk. Call Physicianimmediately. In case of 22. Replace the drain elbow.external contact, flushwith water. 23. Add ice machine sanitizer solution to the sumpKEEP OUT OF THE area until it is full.REACH OF CHILDREN. 24. Move the ICE/OFF/WASH switch to WASH8. Wash the splash guard, drain elbow and water add more sanitizer solution to the sump area untildistributor pan with the ice machine cleaner/water it is full again.solution. 25. After 5 minutes, move the ICE/OFF/WASH9. With the solution of ice machine cleaner and switch to OFF.water, wash the refrigeration tubing, liner,evaporators, support brackets and the water pump 26. Remove the splash guard.assembly. Use the brush and/or a clean cloth. 27. Drain the water from the sump by removing the10. Replace the drain elbow. drain elbow.11. Open the water supply by pushing the water 28. Replace the drain elbow and splash guardvalve button in to the original position and allowthe sump to refill. 29. Open the water supply by pushing the water valve button in (to the original position) and allow12. Add 5 oz. ice machine cleaner to the sump the sump to refill.area. 30. Move the ICE/OFF/WASH switch to ICE.13. Replace the water distributor pan and splashguard. Be certain the hose to water distributor pan 31. Replace the front panel.is connected to pan. 32. Discard first batch of ice and all other batches until all traces of cleaner and sanitizer disappear.14. Move the ICE/OFF/WASH switch to wash andallow the solution to circulate for 15 minutes, thenmove the ICE/OFF/WASH switch to OFF.17. Remove the splash guard. November 1994 Page 15

SLC300 Water Schematic:Refrigeration Schematic: Water flows into the ice machine from its inlet connection at the back of the cabinet, through theFreeze Cycle: inlet water valve and into the reservoir. The water in the reservoir is pumped up and through theFrom the compressor, hot discharge gas is water distributor tube at the top of the evaporators.pumped to the condenser, either air or water From there, the water flows over both sides of thecooled. evaporators and back into the reservoir.At the condenser, heat from the refrigerant flows Melted ice and water spills into the bin flowinto the cooling medium, either air or water, and through a drain in the base of the bin to thethe refrigerant condenses into a liquid. From the exterior drain connection at the back of the cabinet.condenser the liquid refrigerant flows through theliquid line to the metering device - a thermostaticexpansion valve.At the expansion valve, the liquid refrigerantpasses from a high pressure zone to one ofrelatively low pressure, and in the low pressurezone it evaporates. The low pressure zone wherethe refrigerant evaporates is the evaporator. Whenthe refrigerant evaporates, it absorbs heat from themetal parts of the evaporator and the water flowingover it.From the evaporator, the refrigerant flows back tothe compressor through the suction line. Water Distribution System Hot Gas Valve (Closed) Discharge Line Thermostatic Expansion ValveEvaporators Suction Line CondenserInlet Water Compressor Fan Motor Valve & (On) Strainer Water Dryer Float Pump Valve (On) Refrigeration Schematic Water Reservoir Siphon Tube January 1993 Page 16

Harvest Cycle: SLC300The ice maker continures to freeze the water into During the Harvest Cycle, the water level rises,ice unitl the ice next to the ice size thermostat filling the reservoir over the siphon tube andprobe has become thick enough to force water siphoning some of the reservoir water out to theover the probe. After the cold water has reduced drain.the temperature of the probe to 38oF., the ice sizethermotstat will switch the machine into the harvest The harvest cycle continues until the suction linecycle. warms up enough to cause the harvest termination thermostat to switch the machine back into theDuring the harvest cycle, the refrigerant flows from freeze cycle.the condenser, through the discharge line to abranch in the line containing the Hot Gas Valve.This valve is Open during the harvest cycle,allowing the hot discharge gas to bypass thecondenser and enter the evaporator at its inlet.The hot discharge gases warm up the evaporatorenough to allow the surface of the ice frozen to theevaporator to melt. The remaining ice will then falloff into the bin. Water Distribution System Hot Gas Valve (Open) Discharge Line Thermostatic Expansion ValveEvaporators Suction Line Condenser Inlet Compressor Fan MotorWater (Off)Valve Water Dryer Pump Refrigeration Schematic (Off)Water Reservoir Siphon Tube (Draining) November 1994 Page 17

SLC300Technical CharacteristicsTypical Cycle Time •16 minutes @ 90oF. air and 70oF. water; 13 minutes @ 70oF. air and 50oF. waterTypical Harvest Ice Weight •2.4 pounds .Typical Low Side Pressure •18-20 PSIG just before harvestTypical Freeze Cycle Discharge Pressure •190 - 240 PSIG @ 70oF. air and 50oF. water •250 - 290 PSIG @ 90oF. air and 70oF. water •250 for water cooledRefrigerant Charge: •Air cooled = 15 ounces R-502; Water cooled = 16 ounces R-502Harvest Time •Normally 11⁄2 to 2 minutes. Depends upon time required to warm suction line to 55oF.Typical Suction Pressure, In Harvest: •105 -120 PSIG (@75oF. air temp., will be lower in cooler ambients)Typical Discharge Pressure, In Harvest: •120 - 150 PSIGWater Cooled High Pressure Cut Out •Cuts out at 380 PSIG, resets at 315 PSIGTypical Compressor Amp Draw: •6-7 during freeze cycle; 9-10 during harvest cycleCompressor: •Tecumseh AK9466JThermostatic Expansion Valve •Superheat is 3o - 6oF.Bin Thermostat •Cut out at 35oF., cut in at 39oF.. Adjustable warmer.Ice Size Thermostat: • Switches to harvest cycle with temperature fall to 38oF. Resets at 43oF.Ice Size Heater •Adds heat to ice size thermostat to prevent premature harvest. 6,000 ohms resistance.Harvest Termination Thermostat • Opens to switch to freeze cycle with temperature rise to 55oF. Resets at 40oF. January 1993 Page 18

SLC300Service Diagnosis:SYMPTOM POSSIBLE CAUSE PROBABLE FIXNo ice is made, nothing operates Unit off, due to no power Restore powerNo ice, compressor off Unit off, due to ICE/OFF/WASH Switch ICE/OFF/WASH switch toNo ice is made, compressor isoperating switch in OFF position ICE Unit off, due to bin thermostat Check temperature at bin open thermostat bracket, if warmer than 40o F., thermostat should be closed. Adjust/replace thermostat. Water cooled unit off, due to high Lack of water to condenser, pressure cut out open check water supply and water regulating valve. No cooling due to compressor not Check compressor for voltage, operating continuity, and operation. Check starting components. Replace if found to be faulty. Check temperature of compressor, if hot may be lack of refrigerant, defective TXV or compressor No water due to water turned off. Reconnect water supply No water due to water filter Replace water filter plugged. No water due to strainer screen Clean out inlet screen plugged No water due to inlet water valve Replace valve will not open Water in reservoir, but no water Water pump does not work, over evaporators replace pump No cooling at evaporator due to Replace hot gas valve hot gas valve leaking thru No cooling at evaporator due to Check & replace fan motor. fan not turning Fan and pump do not have Coil or relay open, replace relay. power; hot gas valve opens and closes. No cooling at evaporator due to Clean condenser dirty condenser No cooling due to compressor not Check system pressures, replace pumping compressor if not pumping November 1994 Page 19

SLC300Service Diagnosis:SYMPTOM POSSIBLE CAUSE PROBABLE FIXNo ice compressor is operating No cooling due to low refrigerant Locate leak, recover remainingIce is made, but not harvested. charge refrigerant, replace dryer, evacuate and weigh in nameplate charge. Ice size thermostat contacts do Ice not made near thermostat not switch position probe due to water distributor holes restricted. Clean water distributor pan. Thermostat defective, replace it Ice will not slide down ice rack Clean machine with ice machine due to minerals on rack. cleaner. Ice will not slide down ice rack Reposition ice rack due to ice rack out of position Ice will not slide down ice rack Replace ice rack due to bent ice rack Lack of heat during harvest cycle Warm up air or move machine. due to unit in air temp. less than 550F. Lack of heat during harvest due to Replace water regulating valve water flowing thru water cooled condenser Lack of heat during harvest due to Check low side pressure during lack of refrigerant harvest. If low either the charge is low or the hot gas valve does not open fully. If charge is the problem, locate leak, recover remaining refrigerant, repair leak, replace drier, evacuate and weigh in nameplate charge. Lack of heat during harvest due to Check low side pressure during hot gas valve not opening fully. harvest. If low either the charge is low or the hot gas valve does not open fully. Ice does not slide down face of Clean water system with ice evaporator due to minerals on machine cleaner evaporator surface Harvest cycle too short due to Replace harvest termination harvest termination thermostat thermostat opens at too low a temperature. January 1993 Page 20

SLC300Service Diagnosis: POSSIBLE CAUSE PROBABLE FIXSYMPTOM Will not harvest due to hot gas Check for voltage to coil inIce is made, but will not harvest valve not opening. harvest, if there is voltageMakes ice, but very little replace hot gas valveCubes are wrong size/shape Slow/incomplete harvest due to Check low side pressure in hot gas valve not fully open. harvest, replace hot gas valve ifIce fused together in bin too low with correct ref. charge. High discharge pressure, due to Check for causes of high dirty condenser; faulty fan motor; discharge pressure and correct. not enough water thru water cooled condenser, high water temperatures, water reg. valve set too high. Inlet water temperatures and Advise user, suggest additional room ambient very high room cooling. Long freeze cycle due to hot gas Check temperature of tubes to valve leaking thru. and from hot gas valve; there should be a temperature drop across the valve in the freeze cycle. Replace valve if temps are nearly equal. Compressor inefficient Check/replace compressor Ice size thermostat not adjusted Adjust ice size thermostat; use properly gauge shipped with machine Freeze cycle too short due to Check/replace heater on ice size heater open thermostat probe tube. Water system is restricted with Clean water system with minerals Scotsman Ice Machine Cleaner Ice thickness probe tube covered Clean tube with ice machine with minerals cleaner Not enough water Check water supply pressure Check water supply for restrictions Too much superheat Check superheat, replace TXV if too high. Check hot gas valve for leak-thru; replace if leaks thru. Ice in bin too long Advise user to pour water on ice to ease removal Too many minerals in water Suggest water treatment to user. November 1994 Page 21

SLC300 Primary Resistor (Heater)Removal and Replacement 1. Disconnect electrical power.Ice Size Thermostat: 2. Disconnect the primary resistors yellow wireBefore replacing the ice size thermostat, it should from terminal #4 and the white wire from terminalbe positively determined that it is at fault. #1. Pull the two wires out of the control box and thru the insulated wall.1. Disconnect electrical power. 3. Mark location of adjustment bracket. Electrical shock hazard. Electrical shock can 4. Remove two screws and the ice size thermostat cause personal injury. probe tube bracket. Disconnect power before beginning to service 5. Remove the evaporator side plastic sleeve and components. heater from the tube.2. Remove the front panel. 6. Reverse the prior steps to replace. Probe tube3. Remove the control box cover. must be inserted into plastic guide attached to4. Locate the ice size thermostat. evaporator.5. Remove the two screws holding the control tothe control box, and lift the control out. 7. Place adjustment bracket in its original position.6. Pull the three wires off the posts of the ice size Check ice size.thermostat.7. Locate bulb on suction line. Evaporator8. Follow the capillary tube of the ice sizethermostat: the end of the ice size thermostat is Heaterinserted in a tube. Pull it out of the tube.9. Pull the capillary tube of the ice size thermostat Probe Tubethru the grommet in the side of the control box. & Bracket10. Remove the ice size thermostat from thecontrol box. Capillary11. Replace the ice size thermostat with the proper Tubepart number, following the above steps from 10-1. Replacement of Ice Size ThermostatJanuary 1993 Page 22

Removal and Replacement SLC300Water Pump Inlet Water Valve The valve may plug-up from minerals in the water,The pump provides the force to move the water and may be cleaned rather than replaced.from the reservoir to the freezing surface. The 1. Shut off the water supply.pump does not need oil, but if it becomes noisy, 2. Unscrew the fitting at the top of the valve, andoverheats, or will not pump it should be replaced. pull the water inlet tube out of the valve body.Be certain to confirm electrical faults with a 3. Remove the screws holding the valve bracket tovoltmeter or ohmmeter before replacing the pump. the liner.The pump should be operating whenever the 4. Remove the valve from the ice machine.machine is in the freeze cycle. 5. Reverse the above steps to reassemble.1. Unplug or disconnect the electrical power. Electrical shock hazard. Pump Cover Electrical shock can cause personal injury. Thumb Disconnect power before Screws beginning to service components.2. Unplug the pump from its connection.5. Loosen the two fasteners holding the cover tothe wall.6. Remove pump cover from the machine.7. Pull discharge hose from pump discharge port.8. Remove pump from ice machine.9. Reverse above steps to replace. Shut Off Valve Inlet Water Valve & Strainer Float Valve Replacement of WaterSiphon \"U\" Tube PumpNovember 1994 Page 23

SLC300Removal and Replacement: Refrigeration SystemGeneral: equals minimal refrigerant discharged into the air. •Scotsman recommends that any work on the •If hi side pressure must be checked, use a refrigeration system only be done when it is certain that the system needs repair. quick connect at the end of the discharge hose to minimize the release of refrigerant, J/B •Refrigerant should not be added except as a Industries part number A33000 works well. way to determine the proper operation of the •If using recycled refrigerant, it must meet ARI product. If the system was low on refrigerant, there is a leak, and it must be found and spec 700 or have been cleaned by a machine repaired. capable of attaining ARI spec 700. •Refrigerant must not be vented to the If the refrigeration system must be serviced, the quality of service must insure that there will atmosphere. not be a repeat failure, as repeat failures will cause refrigerant to be discharged into the air by •This system has a critical charge, it must be the failure or when the failure is corrected: recharged with the correct amount of refrigerant •If there has been a compressor burn out, check as listed on the nameplate of the ice machine, or performance will suffer. for acid in the oil. If acid is indicated, extra steps must be taken to clean up the system. •Anytime the refrigeration system has been •Never use refrigerant, such as R-11, to clean opened, the dryer should be replaced. up or flush out a refrigeration system. When •When brazing the tubing connections to the hot system clean-up is required, the use of suction line filter-dryers and liquid line filter-dryers are gas or thermostatic expansion valve, the recommended. component must be protected by heat sink material. •Always replace the dryer when repairing a leakSpecifically: or replacing a refrigeration component.Recover, reclaim or recycle refrigerant. The •Evacuate the system with a good vacuummethod chosen is up to the service company.There are various mechanical devices that may be pump to 500 microns or less. If the tripleused to recycle refrigerant at the field level, evacuation method is used, the vacuum shouldhowever, Scotsman requires that any refrigerant be broken each time with dry nitrogen, notplaced into a Scotsman ice machine meet ARI refrigerant. Evacuation must be from both sidesspec 700. Reclaim programs are available through of the system.most refrigerant wholesalers. •Weigh in or measure in the nameplate charge.Use conservation minded service procedures: Recharge into the high side. •Refrain from checking refrigeration •Check for leaks with a high quality, electronic pressures without reason. There are many ways to determine the proper operation of a leak detector. Halide torches will not locate the Scotsman ice machine without using refrigerant very small leaks. gauges. Visual inspection of the water system, observation of the ice formation, amp draw, If an ice machine is to be discarded and still voltage, and other techniques will lead to proper contains refrigerant, Scotsman recommends that diagnosis. Scotsman also recommends that, at the refrigerant be recovered, reclaimed, or the time of initial start up, gauges not be used. recycled so that it is not discharged into the air. •If gauges must be used, do not always check the high side pressure. If the condenser is clean and seems to be operating correctly, it most likely is. The low side pressure is much more important on an ice machine than is the high side. •If gauges must be used, use very short hoses. Minimal refrigerant discharged into the hosesJanuary 1993 Page 24