Double System RLTO THE OWNER OR USER:The service manual you are reading is intended to The is the freezer portion of a commercial iceprovide you, and the maintenance or service machine. It is designed to be connected to thetechnician, with the information needed to install, condensing section of a refrigeration system,start up, clean, maintain and service this ice specifically a supermarket system.system. Table of ContentsFOR THE INSTALLER: Specifications · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 2FOR THE INSTALLER · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 3FOR THE ELECTRICIAN · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 4FOR THE PLUMBER · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 5FOR THE INSTALLER: Final Check List · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 6INITIAL START UP · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 7COMPONENT IDENTIFICATION · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 8COMPONENT DESCRIPTION: Evaporator · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 9CONTROL BOX: Components · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 10ELECTRICAL SEQUENCE · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 11OPERATION · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 12OPERATION: Refrigeration · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 13CLEANING and SANITATION · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 14SENSOR MAINTENANCE · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 15BEARING MAINTENANCE · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 16AUGER MAINTENANCE · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 17SERVICE DIAGNOSIS · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 18SERVICE DIAGNOSIS · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 19CONTROL SYSTEM DIAGNOSTICS · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 20REMOVAL AND REPLACEMENT · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 21REMOVAL AND REPLACEMENT: Bearing And Breaker · · · · · · · · · · · · · · · · · · · · Page 22REMOVAL AND REPLACEMENT · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 23REMOVAL AND REPLACEMENT · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 24REMOVAL AND REPLACEMENT: Evaporator · · · · · · · · · · · · · · · · · · · · · · · · · · Page 25REMOVAL AND REPLACEMENT: Gearmotor · · · · · · · · · · · · · · · · · · · · · · · · · · Page 26This manual was printed on recycled paper, keep itfor future reference.Note the Warning symbol where it appears. Itmarks a potential hazard. November 2000 Page 1
Double System RLFOR THE INSTALLER: Specifications BACK VIEW 15.53\" 3.1\" SUCTION LINE CONNECTION 78\" LIQUID LINE CONNECTION 12\" 20.84\" 9.43\" 5.25\" 3\" 17.8\" ELECTRICAL INLET 18.8\" 21.66\" POTABLE WATER INLET 3/8\" FLAREThe machine is designed to fit a variety of DRAIN 3/4\" FPTScotsman storage bins such as BH800 or SB480. Scotsman Ice Systems are designed andInstallation Limitations: The machine is designed manufactured with the highest regard for safetyfor indoor installations only. and performance. They meet or exceed the standards of U.L., N.S.F., and C.U.L.Air Temp Minimum MaximumWater Temp 50oF 100oF Scotsman assumes no liability or responsibility ofVoltage 40oF 100oF any kind for products manufactured by ScotsmanWater Pressure that have been altered in any way, including the 198 VAC 253 VAC use of any parts and/or other components not specifically approved by Scotsman. 20 psi 80 psi Scotsman reserves the right to make designRO Water Limitation: Water conductivity must be changes and/or improvements at any time.no less than 35 microSiemens/cm. Specifications and designs are subject to change without notice.SPECIFICATIONS:Model Cabinet Size System Refrigerant BTUH required* Voltage Ice Type 208-230 FlakeFME2404RL 42\"w x 27\"h x 24\"d R-404A 12,000 208-230 Nugget 208-230 FlakeNME1854RL same R-404A 12,000 208-230 Nugget 208-230 FlakeFM2402RL-C same R-22 12,500 208-230 NuggetNM1852RL-C same R-22 12,500FME3004RL same R-404A 15,000NME2504RL same R-404A 15,000* Use to determine needed condensing unit capacity. Not an AC load. January 2004 Page 2
Double System RLFOR THE INSTALLERSelect the Location:The unit can only be installed indoors withinthe limitations described on page 2. TYPICAL INSTALLATION: ALLOW ROOM FOR SERVICE ACCESSThe ice machine will have to be connectedto the building’s R-404A refrigerationsystem, check to be sure that the system Ice Machinehas AT LEAST enough extra capacity tohandle the BTUs (from table on page 2) perhour @ 1100F. liquid line temperature(assume a 00F. evaporator temperature).Storage Bin:Scotsman’s B90 will be the presumed bin ofchoice. If using the bin extension BX87,install heavy duty leg kit KLP4 and place thebin into position.Remove the paper tape from the bin edgegasket, and install the bin extension ontothe B90.Remove the paper tape from the binextension top edge, and using a mechanicallift, install the machine onto the top of thestorage bin assembly.Fasten the ice machine to the bin using (4)5/15-18 2.5\" cap screws. BX87 BINLevel the assembly by: EXTENSIONa. Turning the leg levelers in or out on thestandard legs.b. Use shims under the heavy duty legs of B90 STORAGE BINthe KLP4.Locate the Nameplate: The nameplate islocated on the back panel of the machine,and contains the electrical characteristicsparticular to the unit being installed.Refrigeration Installation:The skills of a refrigeration technician arerequired to connect the ice machine to thebuilding’s refrigeration system.Notes: ·A P-trap should be installed where there will be ·Suction Line and Liquid Line Stubs are at the more than 10’ of vertical rise in the suction line. back of the cabinet.·R-404A models: 1.5 ounces of R-404A refrigerant is in the system as a holding charge.·R-22 models: Nitrogen is the holding charge·Be sure there is enough BTU capacity.·Be sure the liquid connection is NOT in series with another liquid line valve.·Local Codes must be observed. November 2000 Page 3
Double System RLFOR THE ELECTRICIANCONFORM TO ALL APPLICABLE CODESElectrical Connections: DETAIL OF JUNCTION BOXLocate the nameplate for the currentrequirements, and then determine the JUNCTIONwire size and type per the National BOXElectric Code. The machine requires asolid chassis to earth ground wire. POWER SUPPLYRefer to the wiring diagram. The icemachine should be connected to it’sown electrical circuit, and beindividually fused.Voltage, when the unit is under fullload, must remain within the limitationslisted on page 2.LOW VOLTAGE CAN CAUSEEQUIPMENT MALFUNCTION AND/ORDAMAGEAll external wiring should conform tothe National, State, and local electricalcodes. Usually the services of alicensed electrician will be required. November 2000 Page 4
Double System RLFOR THE PLUMBER CONFORM TO ALL APPLICABLE CODESWater Supply: Drain System:The recommended water supply line is 3/8\" O.D. All drains are of the gravity type, and must have acopper tubing, with a minimum operation pressure minimum of 1/4\" fall per foot of horizontal run. Theof 20 PSIG, and a maximum of 80 PSIG. Connect drains must be installed to conform to localto cold water using the male flare connection at the plumbing codes. The use of a vent at the machineback of the machine. Install a shut off valve in an and at the bin will allow the system to drainaccessible space between the ice maker and the properly. Use only rigid tubing for drains; insulationwater supply. of the bin drain is recommended. 3/8\" MALE FLARESHUT OFF 3/4\" FPT VALVE VENT THIS DRAINWATER INLET FIELD SUPPLIED BIN DRAIN WATER FILTER FLOOR DRAIN November 2000 Page 5
Double System RLFOR THE INSTALLER: Final Check List1. Is the unit installed where the air and watertemperatures are within and will remain within thelimitations for the unit?2. Is there 6\" clearance at the rear of the machinefor utility connections?3. Has the water supply line be checked forpressures between 20 and 80?4. Has the unit been leveled?5. Has the shipping material been removed frominside the cabinet?6. Have the electrical connections been made?7. Have the drains been installed and checked forleaks?8. Has the refrigeration supply been installed andchecked for leaks?9. Has the bin and cabinet been wiped clean orsanitized?10. Has the warranty registration card beenproperly filled out and mailed to Scotsman?11. Has the owner been given the service manualand been instructed on how to maintain the icemaker?13. Has the owner been given the name andtelephone number of the local Scotsman serviceagency? November 2000 Page 6
INITIAL START UP Double System RL1. Remove the top and front panels. 7. Switch on the other master (mode) switch, observe that:2. Open the water valve, and observe that the twofloat reservoirs fill up with water and shut off. ·The liquid line valve opens ·The gearmotor runs3. Switch on the electrical power. ·Within a short time, that side of the machine4. Open the hand valves (in the liquid lines). begins to make ice.5. Open the ball valves (in the suction lines). ·Water flows from the water reservoir, and the6. Switch on one master (mode) switch, and float drops, letting in more water.observe: 8. With both sides operating, the sight glass should · That liquid line valve opens remain full, and the low side pressure will be about · The gearmotor runs model types 2404 or 1854 (R-404A): · Within a short time, that side of the machine ·30 PSIG, + or - 2 begins to make ice. model types 2402 or 1852 (R-22): · Water flows from the water reservoir, and the ·25 PSIG, + or - 2 float drops, letting in more water. Gearmotor amp draw should not exceed the nameplate rating. 9. Check the system very carefully for any refrigerant leaks, repair as needed.July 2010 Page 7
Double System RLCOMPONENT IDENTIFICATIONLiquid line valve(s) EPR: Evaporator Pressure Regulator Valve This valve maintains a constant pressure on itsThese valves operate to turn the ice making inlet (evaporators) side regardless of the pressureprocess on and off. on the outlet (suction) side. The EPR is factory set, adjust only if needed. After adjusting, re-checkWhen the ice level drops in the ice chute, the ice TXV superheat.level sensor will cause the circuit board to close EPR Settings:the liquid line relay, which energizes the liquid linevalve for that side of the system. The liquid line ·R-22 models (2402/1852): 25 PSIGvalve opens, and liquid refrigerant flows to thethermostatic expansion valve. ·R-404A models (2404/1854, 3004/2504): 36Thermostatic Expansion Valve PSIGThe metering device of each system, the valve(s) Evaporators:sense the temperature of the suction line and vary Where the water is frozen into ice crystals. As thethe amount of liquid refrigerant that passes through water cools, it begins to turn into ice, and thethe valve into the evaporator, thus maintaining a slowly turning auger lifts the ice, as it is beingconstant level of refrigeration. TXV’s are factory made, and forces it up and out of the “breaker” orset. Do not adjust unnecessarily. spout where the extra water is compressed out of the ice. The ice then drops through the chute, intoDO NOT ADJUST THE TXV UNTIL THE EPR HAS the storage bin.BEEN SET.The superheat setting is 4-80F. Measure thetemperature of the evaporator outlet at the TXVbulb, and check the low side pressure at the EPRvalve. Convert the pressure to temperature (usinga temperature pressure chart) and subtract theamount from the outlet temperature. The result isthe superheat. Use an electronic thermometer. EPR VALVE THERMO VALVETHERMO VALVELIQUID LINE EVAPORATOR VALVE November 2000 Page 8
Double System RLCOMPONENT DESCRIPTION: EvaporatorEvaporator: A refrigerated vertical tube filled Divider (only on FM or FME): Where the ice iswater and containing a water seal and auger. compressed and much of the extra water is squeezed out of it before it is discharged into theAuger: A solid stainless steel double spiral auger, bin.it pushes the ice crystals up to the top of theevaporator. Motor: A split phase motor that drives the gear reducer.Water Seal: A two part “face” seal, the top halfrotating with the auger, the bottom half stationary, Bearing: As the ice is pushed up the evaporator,the sealing action being where the two seal “faces” the auger is thrust down, and pressure from themeet. auger thrust is taken up by this bearing.Ice Sweep: A plastic cap with “fingers”. It revolveswith the auger to “sweep” the ice into the ice chute.BEARING ICE SWEEP DIVIDER EVAPORATOR AUGERWATER SEAL MOTOR November 2000 Page 9
Double System RL On/Off (Mode) Switch: Manual control for that side of the machine.CONTROL BOX: ComponentsCircuit Board: Controlling the ice machine usinginput from ice and water sensors. The boardswitches loads on and off through relays. Therelays are for the gear motor (with a built in timedelay to clear the evaporator of ice when the unitturns off) and for the liquid line valve. See photobelow. Control BoardWater OK LightPower Light Service Light Freeze LightBin Full LED3 Auger Light Relay November 2000 LED1 Page 10 Compressor Relay
ELECTRICAL SEQUENCE Double System RLThere are 7 indicator lights on the control board: Shut Down: ·WTR-OK (Water OK). Green. Normal = ·The compressor relay opens, LED1 goes out. Glowing. Glows when there is water in the ·The liquid line valve closes. reservoir. ·The refrigerant flow stops. ·PWR-OK (Power OK). Green. Normal = ·The auger motor stays on for 1 more minute, Glowing. Glows when the control board has power and is functional. clearing out ice in the evaporator, and then ·Service. Red. Normally Off. ·The auger motor relay opens, LED3 goes out ·Freeze. Red. Normally glowing when making and the auger motor stops. The liquid line valve will not re-open until 2 minutes ice. or more have passed after the last shut down. If the path between the ice level sensors remains ·Bin Full. Red. Normally Off when making ice. clear for more than 10 seconds the ice machine will restart. ·LED1. White. Located next to the board’s Control Board Protection Devices Compressor Relay (used to power the liquid line ·When the water level in the reservoir falls valve). Normally Glowing when making ice. below the water level sensor’s tip, the WTR-OK ·LED3. White. Located next to the board’s Auger light goes out and the machine shuts down. When water refills the reservoir the WTR-OK Motor Relay. Normally Glowing when making light glows and the machine starts up again. ice.If the machine is switched off at the mode switch, ·If the auger drive motor current becomesbut is otherwise ready to go, switching the modeswitch to ON does the following: excessive the compressor and auger drive motor will be switched Off and the Service light ·The PWR-OK light glows. will blink. The control board will restart the auger drive motor in 4 minutes. If during the first 60 ·If there is water in the reservoir the WTR-OK seconds after restart the auger motor current stays within limits, the liquid line valve is light glows. reopened and the machine returns to normal operation. If the auger motor’s current is ·After 10 seconds the Freeze, LED1 and LED3 excessive within 60 seconds after the restart, the process will be repeated once more. If lights glow and the machine starts up. during that try the current is still excessive theStart Up: machine shuts down and must be manually reset. The service light will then be glowing ·The compressor relay and auger motor relay continuously. To Reset: Disconnect and reconnect electrical become energized, connecting power to the power to the unit. windings of the auger motor and liquid line valve coil. The mode (on - off) switch is the manual control for the complete machine, but it is not a service ·The liquid line valve opens, refrigerant flows to disconnect. the expansion valve and ice making begins. ·As ice is made it passes between the ice level sensors but because it is not a continuous stream it only interrupts the sensor’s infrared beam momentarily. The bin full light remains off and the machine stays on until ice builds up in the bin and blocks the path between the sensors for 6 seconds or longer. When that occurs the bin full light glows and the machine shuts down.November 2000 Page 11
Double System RLOPERATIONWaterWater enters the machine through the 3/8\" maleflare at the rear of the cabinet, goes to the waterreservoir which it enters through the float valve.The water then goes out the bottom of thereservoir tank to the bottom of the evaporator.Reservoir overflow or evaporator condensation isrouted to the drain.WATER RESERVOIR ICE CHUTE INLET WATER LEVEL EVAPORATOR WATER SCHEMATIC WATER INLET DRIP PAN DRAIN November 2000 Page 12
Double System RLOPERATION: RefrigerationThe remote high side supplies high pressure liquidrefrigerant to the liquid line connection on the icemachine. After the sight glass, there are twoseparate liquid lines, each leading to a liquid linevalve. When the individual ice level sensor causesthe circuit board to energize the liquid line valve,the valve opens, allowing the liquid refrigerant toenter that expansion valve. The thermostaticexpansion valve meters the liquid refrigerant intothe evaporator, where itboils off (evaporates) and LIQUID LINEabsorbs heat. It then SIGHT GLASSmoves through the ballvalve and into theevaporator pressureregulator valve, or EPR.The EPR keeps theevaporator pressureabove a predeterminedpoint, even though thesuction line pressure ofthe remote high side HAND VALVEsystem may vary. Therefrigerant, now a low LIQUID LINE VALVEpressure gas, moves intothe suction line of theremote high side system. THERMO VALVESUCTION LINE EVAPORATORS BALL VALVES EPR VALVE November 2000 Page 13
Double System RLCLEANING and SANITATIONA Scotsman Ice System represents a sizable investment of time and money in any company’s business. Inorder to receive the best return for that investment, it MUST receive periodic maintenance.It is the USER’S RESPONSIBILITY to see that the unit is properly maintained. It is always preferable, andless costly in the long run, to avoid possible down time by keeping it clean; adjusting it as needed; and byreplacing worn parts before they can cause failure. The following is a list of recommended maintenancethat will help keep the machine running with a minimum of problems.Maintenance and Cleaning should be scheduled at a minimum of twice per year.ICEMAKING SYSTEM: In place cleaning 11. After draining the reservoir, as in step 6, wash and rinse the water reservoir.1. Check and clean any water treatment devices, ifany are installed. 12. Go thru steps 13-19 to sanitize the ice machine water system.2. Pull out and remove the front panel. 13. Mix two gallons of sanitizer solution. Use an3. Move the ON-OFF switch to OFF. approved sanitizer.4. Remove all the ice from the storage bin. A possible sanitizer solution may be obtained by mixing two gallons of warm (90-115oF.) potable5. Remove the cover to the water reservoir and water with 1 ounce of household bleach.block the float up. 14. Slowly pout the sanitizer solution into the water6. Drain the water reservoir and freezer assembly reservoir until the float rises, then switch theusing the drain tube attached to the freezer water master switch ON.inlet. Return the drain tube to its normal uprightposition and replace the end cap. 15. As the ice machine uses water from the reservoir, continue to pour the sanitizer solution7. Prepare the cleaning solution: Mix eight ounces into the reservoir.of Scotsman Ice Machine Cleaner with three quartsof hot water. The water should be between 90-115 16. After 12 of the sanitizer solution has been addeddegrees F. to the reservoir, and the reservoir is nearly empty, switch the master switch OFF. Scotsman Ice Machine Cleaner contains acids. 17. Drain the reservoir and thoroughly wash the These compounds may interior of the reservoir and cover with sanitizer cause burns. solution. Be sure the drain hose is upright and capped. If swallowed, DO NOT induce vomiting. Give large 18. Remove the block from the float in the water amounts of water or milk. reservoir. Call Physician immediately. In case of 19. Switch the master switch to ON external contact, flush with water. 20. Continue ice making for at least 15 minutes, to flush out any cleaning solution. Keep out of the reach of children. DO NOT USE any ice produced from the cleaning solution. Be sure no ice remains in the8. Slowly pour the cleaning solution into the water bin.reservoir until it is full. Wait 15 minutes, thenswitch the master switch to ON. 21. Remove all ice from the storage bin.9. As the ice maker begins to use water from the 22. Add warm water to the ice storage bin andreservoir, continue to add more cleaning solution to thoroughly wash and rinse all surfaces within themaintain a full reservoir. bin.10. After all of the cleaning solution has been 23. Sanitize the bin interior by washing the interioradded to the reservoir, and the reservoir is nearly of the bin with the balance of the sanitizer solution.empty, switch the master switch to OFF. 24. Switch the master switch ON.November 2000 Page 14
SENSOR MAINTENANCE Double System RL1. The bin control uses devices that sense light, 2. The ice machine senses water level by a probetherefore they must be kept clean enough so that located in the water reservoir. At least twice a year,they can “see”. At least twice a year, remove the the probe should be removed from the reservoir,bin control sensors from the base of the ice chute, and the tip wiped clean of mineral build-up.and wipe the inside clean, as illustrated. SLIDE ICE LEVEL CONTROLS OUT OF CHUTE CLEAN THE ICELEVEL CONTROL SENSORS Clean the Probe's Tip with ice machine cleaner and a clean, soft cloth. November 2000 Page 15
Double System RL ·unscrewing the auger studBEARING MAINTENANCE Auger StudThe top bearing in the breaker should also bechecked at least two times per year.Check the breaker bearing by: ·removing the ice chute cover Chute Cover Cap Screw·unscrewing the ice sweep Inspect the bearing. There should be plenty of grease in sight. If grease is needed the bearing Ice Sweep and breaker should be removed to check the action of the bearing. It should rotate smoothly. To remove the breaker take out all four allen head cap screws and pull the breaker off the auger and evaporator. If the bearing only needs grease, inject grease into the bearing using Scotsman grease needle pn 02-3559-01 and Scotsman bearing grease cartridge, pn A36808-001. Be sure to inject grease evenly and thoroughly. See Removal and Replacement section to replace bearing or seals. Grease Needle, part number 02-3559-01.·removing the water shed and the breaker cover (left hand thread) Breaker CoverOff Reverse to reassemble. November 2000 Page 16
AUGER MAINTENANCE Double System RLIn some installations the water supply to the ice Switch off electrical power, and shut off the watermaker will be so concentrated with dissolved supply.minerals, (such as calcium carbonate) that as ice is For more information on removal of these parts,made, the evaporator and auger become coated see REMOVAL AND REPLACEMENT.with those minerals, requiring a more frequent 1. To remove the auger, remove front and topcleaning than twice per year. If in doubt about the panel. See Removal And Replacement.condition of the evaporator and auger, the auger 2. Push bail clamp back and remove ice chutecan be removed so the parts can be inspected. cover. 3. Unscrew and remove ice sweep.Note: Water filters can filter out suspended solids, 4. Remove ice chute from evaporator.but not dissolved solids. “Soft” water may not be 5. Remove 4 allen head screws holding breaker tothe complete answer. Check with a water evaporator.treatment specialist regarding water treatment. 6. Pull up on breaker to remove auger. Allow the auger to dry, the stainless steel of the Note: auger and evaporator must be clean and bright. Flaker Components Shown, Nugget Clean the auger and evaporator as required. DO NOT HONE THE EVAPORATOR. Components are Similar 7. Replace the water seal. 8. Reverse to reassemble.DIVIDER, AUGER ALLEN HEAD AND SLOTTED SCREWS COLLAR BREAKER COVER November 2000 Page 17
Double System RLSERVICE DIAGNOSISSymptom Possible Cause Probable CorrectionNo ice is made, nothing Unit off due to no power. Restore poweroperates Unit off due to master switch in Off position Move master switch to ON Unit off due to low water level in reservoir Check water supply, filter andNo ice, auger motor is Unit off due to ice level sensors float valve.turning (photo-electric eyes) blocked Check/clean ice level sensorsUnit makes ice, but very Unit off due to scale on water level sensorslowly Auger motor hums but does not turn Clean water level sensor Auger turning but there is no refrigeration Auger can’t turn. Circuit board effect has not yet shut unit down. Liquid line valve not opening, Unit is shut down check coil, check board relay. No refrigerant to ice machine, Auger not turning check main system. Circuit board has shut ice Low suction pressure machine down due to high auger motor amp draw. Check for No power to circuit board cause of high amp draw, Circuit board gear motor relay will not close including bearings, gear motor Water level or ice level sensor failed condition and scale on auger & Liquid line valve coil is open evaporator. May also be due to Circuit board relay will not close liquid line valve leak thru during High discharge pressure because of dirty the off cycle. Check valve. condenser Due to: motor failure; auger relay Auger and evaporator are coated with failure on circuit board; or gears minerals stripped. Check drive train. Low suction pressure due to low EPR Liquid line valve not opening due setting to coil failure or failure of compressor relay on circuit board EPR setting too low, check/adjust TXV restricted or not metering. Check bulb temperature. Check harness Check / replace board Check / replace sensor Check / replace valve coil Check / replace board Clean condenser. Clean the water system Adjust EPR, check TXV superheat November 2000 Page 18
Double System RLSERVICE DIAGNOSISSymptom Possible Cause Probable CorrectionWater Leak Drain plugged up Clean out drainUses too much waterExcessive ice meltage Tubing cracked Replace tubingMachine makes too much noise Condensation on drain tubing Insulate tubing Hose off Reattach hose Reservoir cover off Return cover to reservoir Reservoir cracked Replace reservoir Evaporator water seal leaks Check base of evaporator & drip pan. If the seal leaks, shut off the water, remove the auger, replace the water seal. Check gear motor for water infiltration. Reservoir float valve leaks thru Replace float valve or seat Bin drain clogged Clean out bin drain. Improper installation of drains, Drains must be separate. they are connected. Poor fit between bin door and door Adjust or replace frame Evaporator coated internally with Clean with Scotsman Ice Machine minerals Cleaner Motor bearings dry Oil or replace motor November 2000 Page 19
Double System RLCONTROL SYSTEM DIAGNOSTICSThe control system consists of: the water. The water OK light should go ON. If it does not, replace the control board. ·Control Board 3. Ice sensor check. Is the Bin Full light Off? If it is ·Water Sensor OFF and the Service light is Off, and the unit is not running, replace the control board. ·Ice Sensors If it is OFF and the auger motor is running but theIf the unit is OFF, check the control board: compressor is not, check the compressor contactor coil.1. Is the Power OK light on? If not check power tothe unit. If it has power, and the Power OK light is If it is on, the ice sensors may be blocked. RemoveNOT on, check the high pressure and low pressure them and check for mineral scale. Scotsman's testcut outs. If they are both closed, replace the board. box can also be used to determine if the ice sensorsIf the Power OK light is ON, go to the next step. or board are defective.2. Is the Water OK light on? If it is, go to the next Using the tester:step. If not, check the water level in the reservoir. Ifthere is water in the reservoir, check that the water A. Disconnect the ice sensors at the connection bysensor is plugged in. To check the water sensor: the ice chute. Connect the LED and PHOTO TRANS wires to the control board's wires.A. Unplug water sensor. B. With the On - Off (mode) switch in either position,B. Pull water sensor from reservoir. move the Bin Full switch on the tester to Bin Full - the tester's light will blink and after a few secondsC. Place one ohmmeter lead on the sensor's plug the bin full light on the control board will come on. Ifand the other on the sensor's tip. The meter should not, replace the board.show nearly zero resistance. If it reads infiniteresistance, check the tip for corrosion. If it is clean Move the Bin switch on the tester to Bin Empty. Theand still reads open, replace the sensor. light on the tester will go out, and after a few seconds the Bin Full light on the board will go out. IfOR connect a copper wire to the wire where the master switch is ON, the unit should start.water sensor plugs into and place the other end inNovember 2000 Page 20
REMOVAL AND REPLACEMENT Double System RLWATER RESERVOIR BIN CONTROLS (Ice Level Sensors) 1. Disconnect electrical power.1. Shut off the water supply to the ice maker. 2. Remove front panel. 3. Remove control box cover.2. Remove front panel and reservoir cover. 4. Locate ice chute, at the base of the chute, in front of and behind it are two plastic bin control3. To remove float only, disconnect water inlet mounts.tube, push in the tab behind the reservoir and pull 5. Slide each bin control to the left, and in thevalve assembly out of the reservoir tank. control box, disconnect the electrical leads connecting the bin control to the circuit board.4. To remove reservoir, disconnect water inlet 6. Reverse to reassemble, be certain that the bincompression fitting at reservoir inlet. controls are aligned so that the ice level sensors are visible (centered) through the holes in the cube5. Remove drain hose from reservoir. chute.6. Remove evaporator inlet hose from reservoir.7. Remove mounting screws from reservoirbracket, and remove reservoir from ice maker.8. Reverse to reassemble. SLIDE BIN CONTROLS IN AND OUTFloat ValveNovember 2000 Page 21
Double System RLREMOVAL AND REPLACEMENT: Bearing And BreakerNote: Removal of the auger, water seal, evaporator d. Lift up, and remove breaker/bearing assemblyand gearmotor must begin at the top of the from auger & evaporator.assembly.To Remove the Breaker Bearing Assembly: 6. Service the bearing. Check for rust, rough spots and damage. Electrical Shock Hazard Electrical shock can cause a. The bearing is pressed into the breaker, to personal injury. Disconnect remove the bearing and replace it an arbor press is electrical power before needed. beginning. b. Replace lower seals before installing new1. Remove panels and disconnect electrical power. bearing in breaker.2. Push back bail clamp, remove insulationretaining strap and insulation, remove ice chute Note: seals must be pressed in with a tool pushingcover. against the outer edge only, they will not install by3. Unscrew and remove ice sweep. hand.4. Lift up and remove ice chute.5. The breaker may be removed from the auger Replace parts as required. Re-grease bearing withand evaporator without disturbing the auger. Scotsman part no. A36808-001 bearing grease.a. Unscrew breaker cover from breaker (left hand Replace top seal, and check the o-rings, replace ifthreads) cut or torn.b. Unscrew auger stud from top of auger.c. Unscrew 4 allen head cap screws holding 7. Reverse to reassemble: specific tools andbreaker to evaporator. materials are required to install properly. a. Add food grade grease such as Scotsman part number 19-0569-01 to the seal area before installing on the auger. b. Check the seal to shaft areas for cuts, or rough spots: none are permitted.Step 5- a Step 5-b Step 5-c and Step 6 ICE SWEEP BEARING SEALS SLOTTED COLLAR AUGER STUD BREAKER COVER DIVIDER November 2000 Page 22
REMOVAL AND REPLACEMENT Double System RLTo Remove the Auger: e. If the auger is stuck use a slide hammer typeTurn off the water to the machine, and unclip the puller to pull on the auger at the threaded hole.evaporator drain hose, pull it down and drain the The size of that hole is 5/8\"-18.evaporator into the bin or a container. Inspect the auger, the critical areas of the auger are: Moving Parts Hazard 1. The auger body. It should be clean and Moving parts can cause shining. Sometimes an auger will appear clean personal injury. Disconnect when wet, but after it is dry it will be seen to be electrical power before stained. Scrub the auger with ice machine cleaner beginning. and hot water.1. The top panel must be removed. Ice machine cleaner is an acid. Handle it with2. Remove ice chute cover. extreme care, keep out of the reach of children.3. Unscrew ice sweep.4. Remove ice chute body. 2. The water seal area. Because the auger has5. The auger and breaker/bearing may now be been removed, the water seal will have to beremoved as an assembly. replaced. Remove the water seal top half from the a. Unscrew 4 allen head cap screws holding auger, and inspect the auger for minerals clean asbreaker to evaporator. required. b. Lift up on breaker and remove auger fromevaporator. DIVIDERAND AUGERASSEMBLY SLIDE HAMMER PULLER THREAD INTO THE AUGER HERENote: If the auger is stuck, the breaker must beremoved from the auger.The breaker may be removed from the auger andevaporator without disturbing the auger. a. Use spanner wrench and unscrew breakercover from breaker (left hand threads)b. Unscrew auger stud from top of auger.c. Unscrew 4 allen head cap screws holdingbreaker to evaporator.d. Lift up and remove breaker from evaporator. November 2000 Page 23
Double System RL To Replace the Water Seal:REMOVAL AND REPLACEMENT 1. Lubricate the water seal with water, and push the water seal into the bottom of the evaporator Moving Parts Hazard. slightly past the grove for the snap ring. Moving parts can cause personal injury. Disconnect 2. Replace the snap ring and pull the water seal electrical power before down against it. beginning. 3. The part of the water seal that rotates with theTo Remove the Water Seal: auger must also be replaced. Remove the old part(Assuming all steps to remove the auger have from the auger and clean the mounting area.been performed.)1. The gearmotor/evaporator assembly will have to 4. Place a small bead of food grade silastic sealantbe exposed. (such as 732 RTV or Scotsman part number2. Remove the 4 hex head cap screws holding the 19-0529-01) on the area of the auger where theevaporator to the gearmotor assembly. Lift the water seal is to be mounted.evaporator up and off of the gearmotor.3. Remove the snap ring or wire retainer from the 5. Carefully push the water seal (rubber sidegrove under the water seal. against the auger shoulder and the silastic.)4. Pull or drive out the lower half of the water seal. CAUTION Do not get any silastic onto the face of the seal. 6. Allow the auger and seal to air dry until the silastic is dry on the surface. 7. If the original water seal was leaking, it would be a good idea to inspect the interior of the gearmotor.WATER PLACE FOOD SEAL GRADE SEALANTRETAINING HERE RING November 2000 Page 24
Double System RLREMOVAL AND REPLACEMENT: EvaporatorTo Replace the Evaporator: To Reassemble the Evaporator and Auger(Assuming all the steps for removal of the thrust 1. After the gearmotor has been inspected, fastenbearing, breaker, auger, and water seal have been the evaporator to the gear motor, torque the boltsperformed.) to 110 inch pounds.1. Shut the hand valves in the liquid and suction 2. Lower the auger into the evaporator barrel,lines to the evaporator being serviced; then slightly turning it to match up with the drive end. Dodischarge the refrigerant. Not Drop Into the Evaporator. 3. Complete the reassembly by reversing the2. Unsweat the refrigerant connections: disassembly for the breaker & thrust bearing assembly.a) At the thermostatic expansion valve outlet. CAUTIONHeat sink the TXV body when unsweating orresweating the adjacent tubing.b) At the suction line at the joint about 3\" from theevaporator.3. Remove theevaporator.4. Unsweat the drier ICE SWEEPfrom the liquid line.5. After installing a AUGERnew water seal in the EVAPORATOR DRIP PANnew evaporator (see“To Replace the WaterSeal”) sweat in thenew evaporator at theold connections.6. Install an new drierin the liquid line.7. Evacuate thesystem untildehydrated, thenweigh in thenameplate charge. BEARINGCheck for leaks.8. Install auger,breaker, breakerbearing assembly, andice discharge chute inreverse order ofdisassembly. See “ToReassembleEvaporator and Auger” DIVIDER/BREAKER November 2000 Page 25
Double System RLREMOVAL AND REPLACEMENT: GearmotorTo Remove and Repair the Gearmotor D) After replacing parts as required, (if any)Assembly: reassemble the gearcase. The two smaller gears and the oil should be in the lower case, the output(Assuming that the procedures through removal of gear will be with the cover. As you lower the coverthe water seal have been performed.) onto the lower case, cover will have to be moved closer to the second gear after the output gear has1. Remove the electrical wires from the gear drive cleared the second gear top bearing. E) After the case is together, and the locating pinsmotor. are secure in both ends, replace all cap screws. 4. Bench test the gearmotor, check for oil leaks,2. Unscrew the 4 cap screws holding the noise, and amp draw.gearmotor to the gearmotor plate. MOTOR3. Remove the gearmotor from the ice maker. SEALTo Inspect the gearmotor.A) Remove the cap screws holding the gearmotorcase halves together and pry the two cases apart.B) To lift off the cover, lift up until you can feelinternal contact, then pull the cover towards theoutput gear end, and thenlift the cover (with drivemotor attached) up andaway from the gear motorcase.Note: The case coveroutput gear, bearings, andshaft are one pressedtogether assembly.Replace as a unit.C) Inspect the oil, gears, GEARCASEand bearings. If the oil level COVERand condition isacceptable, quickly checkthe gears and bearings.They are likely to be fine ifthe oil is.If there is evidence ofwater in the oil (rustybearings and gears; the oil BEARINGhaving a creamy whiteappearance; oil level toohigh) carefully inspect thebearings and gears. If in GASKETdoubt about the conditionof a part, replace it. The oilquantity is 14 fluid ounces,do not overfill.Note: The gears andbearings are available onlyas pressed together sets. November 2000 Page 26
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