Scotsman NDE750 Service Manual

reading is intended to provide you, and the maintenance or service technician with the information needed to install, start up, clean, maintain, and service this ice maker-dispenser. The NDE750 is a combination nugget ice maker and countertop dispenser. A water station is standard. The NDE750 ice making section is equipped with the following features: electronic controls for bin level and low water; thermostatic expansion valve; front service for most components; and R-404a (HP62) refrigerant. The ice dispensing section is a seamless plastic storage bin, with a stainless steel ice agitator at the bottom to sweep the ice into the dispensing chute. Table of Contents FOR THE INSTALLER: Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . 2 FOR THE INSTALLER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 FOR THE PLUMBER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 FOR THE ELECTRICIAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 FOR THE INSTALLER: Final Check List . . . . . . . . . . . . . . . . . . . . . . . . 6 INITIAL START UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 COMPONENT DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 COMPONENT DESCRIPTION: Control Box . . . . . . . . . . . . . . . . . . . . . . . 9 ELECTRICAL SEQUENCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 OPERATION: Water . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 OPERATION: Refrigeration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 OPERATION: Ice Vending . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 CLEANING and SANITIZING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 MAINTENANCE AND CLEANING . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 MAINTENANCE AND CLEANING: Auger . . . . . . . . . . . . . . . . . . . . . . . . 17 SERVICE DIAGNOSIS: Condition - No Ice Being Produced . . . . . . . . . . . . . . 18 SERVICE DIAGNOSIS: Condition - Low Ice Production . . . . . . . . . . . . . . . . 21 SERVICE DIAGNOSIS: Condition - Poor or No Ice Dispensing . . . . . . . . . . . . . 22 REMOVAL AND REPLACEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 REMOVAL AND REPLACEMENT: Bearing And Breaker . . . . . . . . . . . . . . . . 24 REMOVAL AND REPLACEMENT: Water Seal . . . . . . . . . . . . . . . . . . . . . 26 TO REMOVE AND REPAIR THE GEARMOTOR ASSEMBLY . . . . . . . . . . . . . 28 REFRIGERATION SERVICE: HP62 . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 REFRIGERATION SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 This manual was printed on recycled paper. Keep it for future reference. Note this symbol when it appears. It marks a possible hazard. NDE750 December 1993 Page 1

This ice maker-dispenser is designed to be mounted on a machine stand, or a countertop. Before beginning the installation, check that all the materials and kits required are available at the installation location. Scotsman Ice Systems are designed and manufactured with the highest regard for safety and performance. They meet or exceed the standards of U.L., N.S.F., and C.S.A. Scotsman assumes no liability or responsibility of any kind for products manufactured by Scotsman that have been altered in any way, including the use of any 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. Water Limitations: An ice machine is a food manufacturing plant; it takes in a raw material, water, and turns it into a food product, ice. The purity of the water is very important in obtaining pure ice and in maximizing product life. General recommendations are: 1. Filter the water used to produce ice. 2. Check with a water treatment specialist for a water test, and any recommendations regarding filters and treatment. Electrical Junction Box 3/8" Flare Water Inlet 3/8" FPT Cond. Water Inlet (W/C) 1/2" FPT Cond. Drain (W/C) 3/4" FPT Drain .75" 17.59" 5.59" 3/4 FPT Drain 2.63" 12.5" 6.63" 7.93" 4.63" 3.84" BACK VIEW SPECIFICATIONS + Minimum Circuit Ampacity is used to determine wire size and type per National Electric Code. Optional kit: KPC750 adds dispense portion control to units mfg. after 6/97. NDE750AE-1 NDE750WE-1 45.74" x 35.18" x 29.26" same Nugget same Air Water 115/60/1 same 18.1 16.5 25 20 32 ounces 22 ounces Model Number Dimensions (w/o stand) H" x W" X D" Ice Type Condenser Type Basic Electrical Minimum Circuit Ampacity+ Maximum Fuse Size Refrigerant Charge (R-404a) NDE750 May 1997 Page 2

Location This ice system is designed to be installed indoors, in a controlled environment. Minimum Maximum Air Temp 500F. 1000F. Water Temp 400F. 1000F. Water Pressure 20 psi 80 psi Voltage 104 126 Operating the machine outside of the above limitations, or outdoors, is potentially damaging to the machine; also it is misuse of the machine which may void the warranty. Service Limitations Do not install in a location where the top of the machine is within 6" of a fixed ceiling. Air cooled models require a minimum of 6 inches to the left and right of the machine for air circulation. It is important that the machine be installed in a location where it has enough space above and behind it for service. After uncrating and inspection, the unit is ready for installation. Machine Stand Installation Tip the stand on its back and install the legs, return the stand to the upright position. Adjust leg levelers so that the stand does not “rock”. Counter Top or Machine Stand Installation The base of the icemaker-dispenser must be sealed to the object it rests upon. Food grade silastic sealant such as Scotsman part number 19-0529-01 is recommended. Place a bead of the sealant on the machine stand or counter top to match the outside edge of the cabinet base and sink. The icemaker-dispenser is heavy: use of a mechanical hoist is recommended to lift it to the height required to install it. The DMS machine stand has holes in the top that match up with threaded holes in the base of the machine. Secure the machine stand to the base with 4 5/16" bolts. In both counter top and machine stand installations, wipe off and neatly smooth any excess sealant. Level the machine stand and cabinet. Unpack and install the sink brackets. Fit the sink assembly onto the two sink brackets, and press onto the bead of sealant. Wipe off and neatly smooth any excess sealant from under the sink edge. Connect the sink drain to the dispenser drain system. SEAL ICEMAKER- DISPENSER TO THE COUNTER TOP OR MACHINE STAND Airflow NDE750 December 1993 Page 3

CONFORM TO ALL APPLICABLE CODES Water Inlet Air Cooled Models: The recommended water supply is clean, cold water. Use 3/8" O.D. copper tubing, connect to the 3/8" male flare at the back of the cabinet. Install a hand valve near the machine to control the water supply. Water Treatment: In most areas, a water filter of some type will be useful. In areas where the water is highly concentrated with minerals the water should be tested by a water treatment specialist, and the recommendations of the specialist regarding filtration and/or treatment should be followed. Water Cooled Models: A separate 3/8" O.D. copper line is recommended, with a separate hand valve to control it. It is connected to a 3/8" FPT condenser inlet at the back of the cabinet. The water pressure to all lines must always be above 20 psig, and below 120 psig. Drains Air Cooled Models: There is one 3/4" FPT drain at the back of the cabinet, the drain line is of the gravity type, and 1/4 inch per foot fall is an acceptable pitch for the drain tubing. There should be a vent at the highest point of the drain line, and the ideal drain receptacle would be a trapped and vented floor drain. Use only 3/4" rigid tubing. Water Cooled Models: In addition to the above mentioned drain, a separate condenser drain must be installed. Connect it to the 1/2" condenser drain connection at the back of the cabinet. INLET WATER VENTED DRAIN OPTIONAL WATER FILTER SHUT OFF VALVE FLOOR DRAIN WATER COOLED CONDENSER WATER INLET CONDENSER DRAIN NDE750 December 1993 Page 4

CONFORM TO ALL APPLICABLE CODES The electrical power to the unit is supplied through the junction box at the rear of the machine. Check the nameplate (located on the back panel) for the voltage requirements, and for the minimum circuit ampacity. The machine requires a solid chassis to earth ground wire. The ice maker should be connected to its own electrical circuit so it would be individually fused. Voltage variation must remain within design limitations, even under starting conditions. All external wiring must conform to national, state, and local electrical codes. The use of a licensed electrician is required to perform the electrical installation. POWER SUPPLY ELECTRICAL CONNECTION NDE750 December 1993 Page 5

1. Is the icemaker-dispenser installed indoors, in a location where the air and water temperatures are controlled, and where they do not go beyond design limitations? 2. is there an electrical service disconnect within sight of the installed machine? Is the machine on a separate circuit? Has the voltage been checked and compared to nameplate requirements? 3. Have all of the plumbing connections been made and checked for leaks? 4. Has the machine been leveled? 5. Is there a minimum of 6 inches of clearance at the left and right sides of an air cooled machine? 6. Is there a minimum of 6 inches of clearance at the top and back of the machine for service and utility connections? 7. Is there a water shut off valve installed near the machine? 8. Have all of the shipping blocks been removed? ELECTRICAL? LEVELED? WATER INLET? DRAINS? NDE750 December 1993 Page 6

Pre Start Inspection 1. Remove the two front panels. 2. Check that all shipping blocks have been removed. 3. Remove any and all packing tape (check inside the storage bin). 4. Inspect the interior of the machine for loose screws or wires. Check that no refrigerant lines are rubbing each other. Check that the fan blade on air cooled models turns freely. 5. Check that the machine is installed correctly according to the final check list. Start Up 1. Go through the pre start inspection. 2. Open the water hand valve, observe that water enters the water reservoir, fills the tube from the reservoir to the evaporator and then shuts off. Check for leaks. 3. Switch the master switch on. The electrical start up sequence is now on automatic: A. There will be a short (15 second) delay before the gearmotor starts. B. After the gearmotor starts, the compressor will start. 4. On air cooled models, warm air will begin to flow from the condenser. Water cooled models will begin to discharge warm water down the drain. 5. The unit should soon be making ice. If desired, the low side pressure may be checked: it should be 38 PSIG + or - 4 PSIG. The air cooled discharge pressure will depend upon air and water temperatures, but should be between 200 PSIG and 300 PSIG. Water cooled discharge pressure should be about 245 PSIG. If needed, adjust the water regulating valve. The above numbers are for new, clean machines. Field values may be somewhat higher or lower. 6. There are no adjustments to make, so replace the panels. 7. Check ice dispensing by pushing in on the glass filler lever. Ice dispenses are portion controlled; by turning a knob, the length of time the unit dispenses when the glass filler lever is pushed (and the amount of ice dispensed) is adjusted. 8. Switch off the icemaker-dispenser, remove the top panel and the top of the ice storage bin. Sanitize the interior of the ice storage bin by wiping it with a mixture of 1 ounce of household bleach to 2 gallons of water, allow to air dry. Replace all covers and panels. Switch the icemaker-dispenser back on. 9. Give the owner/user the service manual, instruct him/her in the operation and maintenance requirements of the unit. Make sure they know who to call for service. 10. Fill out the Customer Evaluation and warranty Registration form, and mail it in to Scotsman. NDE750 December 1993 Page 7

operate the machine. High Pressure Cut Out Switch: A manual reset switch sensing the high side refrigeration pressure. It is set to shut the machine off if the discharge pressure should ever exceed 450 psig. Evaporator: A vertical stainless steel tube, refrigerated, and water filled. In it there is a stainless steel auger. Reservoir: Float operated, it maintains the water level in the evaporator at a constant level, it also contains the water level sensor. Water Level Sensor: Senses if there is water in the reservoir to make ice out of. Will shut the machine off it there is none. Low Pressure Cut Out Switch: A manual reset control that shuts off the ice machine when the low side pressure drops below a preset point, 0-4 psig. Drain Tube: When uncapped and lowered, drains the evaporator. Condenser: Air or water cooled, where the heat removed in ice making is discharged. Ice Storage Bin Assembly: A plastic lined, insulated cylinder that receives, stores and dispenses the ice. Fresh ice enters at the top, and when the bin is full enough the ice will be between the ice level sensors, and the icemaking will stop. Ice is dispensed through a chute at the bottom front when the agitator assembly sweeps the ice through the chute. Glass Filler Lever: Pushing in on this lever causes the ice dispensing cycle to occur. Portion Control Knob: Turning this knob adjusts the length of time of dispense. Not standard after 6/97. DRAIN TUBE EVAPORATOR ICE STORAGE BIN CONTROL BOX GLASS FILLER CONDENSER HI PRESSURE CUT OUT LOW PRESSURE CUT OUT DRAIN TUBE WATER LEVEL SENSOR ICE LEVEL SENSOR PORTION CONTROL KNOB RESERVOIR Ice Level Sensor: An electronic “eye”, it senses the presence of ice in the bottom of the ice discharge chute. Operates to turn the ice machine on and off automatically as the level of ice in the bin changes. NDE750 May 1997 Page 8

Contactor: A definite purpose contactor connecting the compressor to the power supply. Circuit Board: Controlling the ice machine through sensors and relays. The sensors are for ice level and water level. The relays are for the gear motor (with a built in time delay to clear the evaporator of ice when the unit turns off) and for the compressor. On/Off Switch: Manual control for the machine. Transformer: Supplies low voltage to the circuit board. Potential Relay: The compressor start relay. Portion Control Module: Controls the amount of time the dispensing drive motor is on. The time is varied by adjusting the portion control knob. Note: Portion control not standard on units mfg. after 6/97. May be added on with kit KPC750. PORTION CONTROL POTENTIAL RELAY CONTACTOR TRANSFORMER CIRCUIT BOARD NDE750 May 1997 Page 9

water and containing a water seal and auger. Auger: A solid stainless steel double spiral auger, it pushes the ice crystals up to the top of the evaporator. Water Seal: A two part "face" seal, the top half rotating with the auger, the bottom half stationary, the sealing action being where the two seal "faces" meet. Ice Sweep: A plastic cap with "fingers". It revolves with the auger to "sweep" the ice into the ice chute. Breaker: Where the ice is compressed and much of the extra water is squeezed out of it before it is discharged into the bin. Motor: A split phase motor that drives the gear reducer. Thrust Bearing: As the ice is pushed up the evaporator, the auger is thrust down, and pressure from the auger thrust is taken up by this bearing. ICE SWEEP BEARING EVAPORATOR ICE CHUTE AUGER WATER SEAL WATER INLET GEAR MOTOR BREAKER NDE750 December 1993 Page 10

If the machine is switched off at the master switch, but is otherwise ready to go, switching the master switch to on does the following: ••The bin empty light on the circuit board goes on ••There is a 15 second delay ••If there is enough water in the reservoir, the circuit board will allow the machine to start up. Start up consists of: ••The compressor relay and auger motor relay become energized, connecting power to the windings of the auger motor. ••The auger motor starts, and the centrifugal switch closes, connecting power to the compressor contactor coil. ••The contactor is energized, connecting power to the compressor, and the compressor starts. ••As ice goes past the ice level sensors, the bin empty light will stay on, and the machine will continue to run, unless the ice stays between the sensors for more than 15 seconds (bin full). At that point, the bin empty light goes out, and the machine shuts down. Shut Down consists of: ••The compressor relay opens. ••The compressor contactor opens ••The compressor stops ••The auger motor is run by the circuit board for 2 more minutes, clearing out ice in the evaporator, and then ••The auger motor relay opens, and the auger motor stops. If the ice level sensor is clear (bin empty) for more than 15 seconds, the machine will start up again. Another purpose of the circuit board is to turn the machine off if there is not enough water in the machine. ••When the water level in the reservoir falls below the water level sensor, the machine will “shut down” ••When the water refills the reservoir, the machine will start up again. Separate from the circuit board: ••If the high pressure control (cut out switch) opens, the machine will stop immediately (through the relays on the circuit board). It must be manually reset . ••If the low pressure control (cut out switch) opens, the machine will stop immediately (through the relays on the circuit board). It must be manually reset. ••The master switch is the manual control for the complete machine, but it is not a service disconnect. Ice Vending ••When the glass filler lever is pushed in the vend switch closes. That energizes the ice chute door solenoid, and the portion control module, which, depending upon the setting of the portion control knob, will power the agitator drive motor for a set length of time. ••Holding the glass filler lever in will not cause additional dispensing, unless the portion control is set for continuous dispensing. Releasing and re-pushing the glass filler lever will repeat the dispense cycle. NDE750 December 1993 Page 11

flare at the rear of the cabinet, goes to a strainer and then to the water reservoir which it enters through the float valve. The water then goes out the bottom of the reservoir tank to the bottom of the evaporator. Reservoir overflow, evaporator condensation and water in the sink are all routed to the drain. Water cooled models have a separate water circuit for the cooling water: it enters the fitting at the rear, goes to the water regulating valve, then to the water cooled condenser and down the drain. The water dispensing station adds an additional water circuit. When the water station glass filler lever is pushed, a switch closes a circuit to an electric water valve, and water is dispensed. WATER LEVEL RESERVOIR RESERVOIR OVERFLOW DRAIN SINK DRAIN WATER VALVE BIN DRAIN WATER INLET WATER SCHEMATIC Note: The correct water level is determined when the machine is operating. Check the water level and compare it to the line molded into the side of the reservoir. The water level should be between 1⁄8" above and 1⁄4" below the line. If needed, adjust the water level by bending the float arm. NDE750 December 1993 Page 12

compressed into a high temperature gas. The discharge line directs this gas to the condenser. At the condenser (air or water cooled) the gas is cooled by either air or water and it then condenses into a liquid. This high pressure liquid then goes through the liquid line to the expansion valve. The thermostatic expansion valve meters liquid refrigerant into the evaporator, the volume of liquid refrigerant depending upon the temperature of the evaporator; warmer evaporators get more refrigerant and colder evaporators get less. At the evaporator, the refrigerant enters an area of relatively low pressure, where it can easily “boil off” or evaporate. As it evaporates, it absorbs heat from the evaporator and whatever is in contact with it (such as the water inside it). After the evaporator, the refrigerant, now a low pressure vapor, goes through the suction line back to compressor, where the cycle is repeated. LIQUID LINE SUCTION LINE THERMOSTATIC EXPANSION VALVE EVAPORATOR COMPRESSOR FAN MOTOR CONDENSER REFRIGERATION SCHEMATIC (AIR COOLED SHOWN) DISCHARGE LINE NDE750 December 1993 Page 13

When the ice dispensing glass filler lever is pushed, an electrical circuit is made to the ice chute door solenoid causing the ice chute door to open. At the same time power is connected to the portion control module in the control box. That module will energize the agitator drive motor for a certain length of time, depending upon the setting of the portion control knob. The dispensing takes place when the agitator sweeps the ice through the ice dispensing chute: ice will continue to discharge out this chute as long as the agitator is turning. It stops when the agitator stops. ICE DISCHARGE CHUTE STORAGE BIN AGITATOR AGITATOR DRIVE MOTOR VEND SWITCH GLASS FILLER LEVER SINK DOOR SOLENOID ICE CHUTE DOOR ICE CHUTE NDE750 December 1993 Page 14

A Scotsman Ice System represents a sizable investment of time and money in any company’s business. In order 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, and less costly in the long run, to avoid possible down time by keeping it clean; adjusting it as needed; and by replacing worn parts before they can cause failure. The following is a list of recommended maintenance that will help keep the machine running with a minimum of problems. Cleaning should be scheduled at a minimum of twice per year. Sanitizing of the ice storage bin should be scheduled for a minimum of 4 times a year. Electrical power will be ON when doing in place cleaning. ICEMAKING SYSTEM: In place cleaning 1. Check and clean any water treatment devices, if any are installed. 2. Remove screws and remove the upper front panel. 3. Move the ON-OFF switch to OFF. 4. Remove the cover to the ice storage bin, and remove the ice. 5. Remove the cover to the water reservoir and block the float up. 6. Drain the water reservoir and freezer assembly using the drain tube attached to the freezer water inlet. Return the drain tube to its normal upright position and replace the end cap. 7. Prepare the cleaning solution: Mix eight ounces of Scotsman Ice Machine Cleaner with three quarts of hot water. The water should be between 90-115 degrees F. 8. Slowly pour the cleaning solution into the water reservoir until it is full. Wait 15 minutes, then switch the master switch to ON. 9. As the ice maker begins to use water from the reservoir, continue to add more cleaning solution to maintain a full reservoir. 10. After all of the cleaning solution has been added to the reservoir, and the reservoir is nearly empty, switch the master switch to OFF. 11. After draining the reservoir, as in step 6, wash and rinse the water reservoir. To Sanitize: Repeat steps 8-11, except substitute sanitizer solution for the cleaning solution. A possible sanitizer solution may be made by mixing 1 ounce of household bleach and 2 gallons of warm (95oF. - 115oF.) potable water. 12. Remove the block from the float in the water reservoir. 13. Switch the master switch to ON 14. Continue ice making for at least 15 minutes, to flush out any cleaning solution. Check ice for acid taste - continue icemaking until ice tastes sweet. DO NOT USE any ice produced from the cleaning solution. Be sure no ice remains in the bin. 15. Remove all ice from the storage bin. 16. Add warm water to the ice storage bin and thoroughly wash and rinse all surfaces within the bin. 17. Sanitize the bin interior, cover, door and agitator with an approved sanitizer using the directions for that sanitizer. 18. Replace the ice storage bin cover, and the front panel. Scotsman Ice Machine Cleaner contains acids. These compounds may cause burns. If swallowed, DO NOT induce vomiting. Give large amounts of water or milk. Call Physician immediately. In case of external contact, flush with water. Keep out of the reach of children. NDE750 December 1993 Page 15

1. The ice machine senses water level by a probe located in the water reservoir. At least twice a year, the probe should be removed from the reservoir, and the tip wiped clean of mineral build-up. 2. The bin control uses devices that sense light, therefore they must be kept clean enough so that they can “see”. At least twice a year, remove the bin control sensors from the ice chute, and wipe them clean. 3. The bearing in the breaker should also be checked at least two times per year. A. Check the bearing by: ••removing the ice chute cover ••unscrewing the ice sweep ••removing the water shed ••unscrewing the breaker cover. ••unscrewing the auger stud Inspect the assembly, looking for wear. See Removal and Replacement to replace bearing or seals. Reverse to reassemble. 4. Check and tighten all bolts and screws. CLEAN THE TIP ////////////////////////////// CAUTION: THE TIP IS MADE OF GLASS; ///////////////////////////// ICE SWEEP PROBE RESERVOIR SLIDE SENSORS UP TO REMOVE NDE750 December 1993 Page 16

In some areas, the water supply to the ice maker will contain a high concentration of minerals, and that will result in an evaporator and auger becoming coated with these minerals, requiring a more frequent removal than twice per year. If in doubt about the condition of the evaporator and auger, the auger can be removed so the parts can be inspected. Note: Water filters can filter out suspended solids, but not dissolved solids. “Soft” water may not be the complete answer. Check with a water treatment specialist regarding water treatment. For more information on removal of these parts, see REMOVAL AND REPLACEMENT. Disconnect electrical power, and shut off the water supply. Use care when removing the auger, it has sharp edges. 1. To remove the auger, remove the front and top panels. 2. Drain evaporator using drain hose. 3. Remove bail clamp from over ice chute cover and remove cover. 4. Unscrew and remove ice sweep. 5. Remove ice chute from evaporator. 6. Remove 4 allen screws holding breaker to evaporator. 7. Pull up to remove auger. After the auger has been removed, allow the auger to dry: if the auger is not bright and shiny, it must be cleaned. Clean the auger and evaporator as required. DO NOT HONE THE EVAPORATOR. 8. Replace the water seal. 9. Reverse to reassemble. BREAKER AND AUGER ASSEMBLY Moving Parts Hazard. Disconnect electrical power to the icemaker - dispenser before beginning. Air Cooled Model Clean the air cooled condenser whenever the ice machine water system is cleaned, more frequently if in a dusty or greasy area. 1. Shut off electrical power. 2. Remove right side service panel. 3. Brush off condenser fins, use soft bristle brush or vacuum. 4. Check with light to see if fins are clean all the way through. 5. Use coil cleaner if grease is deep inside fins. 6. Replace service panel and reconnect power. NDE750 December 1993 Page 17

STATUS: ICE MAKER DOES NOT OPERATE A. Check: Voltage to the unit, restore power if there is none. Compare to the nameplate. B. Check: The master switch, switch ON if off. C. Check: The reset switches, (high and low pressure): depress and release each switch. If the machine still does not start, check: the high and the low side pressures. D. Check the low pressure cut out, if closed, go to E; if it is open, it could be due to: ••Low refrigerant charge ••The auger not turning ••Restricted system ••TXV not opening 1. Check the low side pressure, the low pressure cut out opens at pressure below 4 psig. If open, reset and: a. Check if the auger is turning, if it is not, remove the gearbox and: Check for internal damage, repair and replace in the machine. b. Check for low charge, add some refrigerant, if the unit will operate,(normal low side pressure being about 38 psig) stop and look for a leak, repair, replace the drier, evacuate, and weigh in the nameplate charge. If, with added charge, the unit does not operate: Check for a restricted system, replace the drier, evacuate, and weigh in a nameplate charge. Check for a Thermostatic Expansion Valve that does not open, if defective, replace it. Replace the drier, evacuate, and weigh in the nameplate charge. E. Check the high pressure cut out, if closed, go to F; if open: 1. The pressure control opens at 450 psig. Check the high side pressure, reset the control, and observe: on water cooled, that water soon begins to flow from the condenser drain; or, on air cooled, that the fan is forcing air through the condenser. If the unit trips out on pressures below 450 psig, replace the control. If the pressures rise above the trip out point, and the unit shuts down: a. Check for adequate water flow on water cooled, if adequate, clean the interior of the condenser. If the pressures are still too high replace the water regulating valve. b. Check for adequate air flow on air cooled. Clean the condenser and (if used) the filter. If the air flow is poor because of the installation, advise the user that the unit should be moved, or the air around it kept cooler. Check the fan motor for tight bearings and proper rotation. Check that the fan blades are clean, and the fan secure to the fan motor shaft. F. Check the water level in the reservoir. The machine will not run if there is not enough water in the reservoir. 1. Restore/adjust water level. See the next step. NDE750 December 1993 Page 18

STATUS: ICE MAKER DOES NOT OPERATE G. Check: The gear motor, if it will not run, the compressor will not run. If no power to it: Check: The indicator lights on the circuit board, the bin empty light should be ON, the no water light should be OFF . 1. If the bin empty and no water lights are off, check the transformer. a. Transformer “load” side should have 12 to 15 volts. If not, check the “line” side. The line side should have between 110-120 volts. If the line side has the correct voltage and the load side does not, replace the transformer. 2. If the transformer is good, and the bin empty light is OFF, check the ice level sensors. a. Remove sensors by pulling them out of the ice chute grommets. Visually inspect them, clean if needed. b. Look through the ice chute “eye” hole for something blocking the ice chute. c. If the unit still does not run, replace the ice level sensors. d. If the bin empty light is still OFF, check the circuit board. 1. Unplug “opto trans” and “LED” connectors from the circuit board. 2. Plug “opto trans” and “LED” connectors from the Scotsman Electronic Control Tester Model NM1 into the circuit board. a. Move the “bin full” switch on the tester to the full position. The bin full light on the tester should be ON, if not, replace the circuit board. If the bin full light on the tester is ON, move the tester switch to “bin empty” the light on the tester should go OFF and the bin empty light on the circuit board should go ON. If not, replace the circuit board. If it does as above, and the machine still does not run, replace the ice level sensors. 3. If the transformer is fine, and the “no water” light is ON, check the water level sensor. a. Check the water level in the reservoir, restore if low. If the water level is ok: b. Remove the water level sensor from the reservoir and clean the tip if dirty. CAUTION: THE TIP IS MADE OF GLASS c. Replace the water level sensor. If the no water light is still on, check that the "water sen" plug is firmly plugged into the circuit board. d. If the no water light is still on, 1. Unplug the “water sen” connector from the circuit board. 2. Plug “water sen” connector from the Scotsman Electronic Control tester into the circuit board. a. Move the water switch on the tester to “no water” and the no water light on the circuit board should go on. If not, replace the board. b. Move the water switch to the “water” position, the no water light should go off, if not, replace the circuit board. c. If after the above, the machine still will not run, replace the water level sensor MORE INFORMATION ON THE TESTER MAY BE FOUND AT THE BACK OF THE MANUAL. NDE750 December 1993 Page 19

STATUS: GEARMOTOR OPERATES, COMPRESSOR DOES NOT A. Check the compressor relay. The relay is on the circuit board, if it does not supply power to the contactor coil, the compressor will not run. 1. Check for power at the contactor coil, if none: a. Check for power at the compressor relay at the circuit board. If there is power at the relay, but none at the contactor coil, Check for an open wire between the relay and the contactor. 2. Check the contactor coil. If the coil is open, replace the contactor. 3. Check the auger drive motor centrifugal switch. If, when the drive motor is running, contact 4 (black wire removed) has no power, and all of the above switches have been checked, replace the centrifugal switch, or the drive motor. 4. If the compressor relay on the circuit board has power on the NO contact, but not on the COM contact, replace the circuit board. B. Check the compressor 1. Check the compressor start relay. 2. Check the start capacitor. 3. Check the windings of the compressor for open windings or shorts to ground. Replace those items found defective. NDE750 December 1993 Page 20

STATUS: EVERYTHING IS OPERATING A. Check the air cooled condenser for dirt. Clean as required. Check the head pressure on water cooled. Adjust as required. If the head pressure is very high: 1. Air cooled. Check for high air temperatures, or restrictive air flow. Correct as needed. 2. Water cooled. Check for high water temperatures, or low water pressure. Correct as needed. 3. The refrigerant may contain non condensable gases, purge, evacuate, and recharge per nameplate. B. Check the evaporator 1. Clean the evaporator, the mineral build up will adversely affect the ice machines production. 2. Check the evaporator for water leaks, replace the water seal if found to be leaking. 3. Check the low side pressure; normal is about 38 psig. If low, assume a refrigerant leak, locate, repair and recharge. If no leak, the TXV may be restricted, defective or not adjusted properly. If needed, replace the TXV, evacuate, and recharge per nameplate. 4. Check the insulation on the evaporator. It should be dry, with no wet spots or frost. If the insulation has failed: replace the evaporator or add extra insulation in the form of foam tape to the evaporator. C. Check the compressor. 1. The compressor may be inefficient. a. Check the amp draw, if low change the compressor. b. if the amp draw is normal, pinch off the suction line to check the pull down capability of the compressor. The compressor should pull down to 25 inches of vacuum and hold there for three to five minutes. NDE750 December 1993 Page 21

STATUS: There is power to the unit, but no ice is dispensed A. Check for ice in the bin, if no ice, check the ice making system. If the ice making system is normal, the demand for ice may exceed the quantity the icemaker can produce. Check with the user on ice usage: advise the user that another machine may be needed. B. Check for motion in the agitator when the glass filler lever is pushed, if no motion: Check the vend switch, if it does not close when the glass filler lever is pushed, replace the switch. If the vend switch does close, check for voltage at the agitator drive motor. If there is voltage, and the agitator motor output shaft does not turn, replace the agitator gear motor assembly. C. Check that the ice dispensing door opens when the glass filler lever is pushed. If not, check the vend switch. If the vend switch is good, check the door solenoid. If the agitator moves when it is supposed to, and there is ice, the dispensing cycle should be fine. is dispensed, check for an obstruction in the ice chute. D. No portion control. 1. Continuous dispensing when the glass filler lever is pushed in: Check for an open potentiometer (portion control). If open, replace it. If it is not open, replace the portion control module in the control box. 2. Very short dispensing: Check for a shorted potentiometer (portion control). If shorted, replace it. If it is not shorted, replace the portion control module in the control box. NDE750 December 1993 Page 22

WATER RESERVOIR 1. Shut off the water supply to the icemaker. 2. Remove front panel and reservoir cover. 3. To remove float only, pry the mounting flanges apart enough to lift one float pivot pin out of the flange hole, and pull float up and out of the reservoir. 4. To remove reservoir, disconnect water inlet compression fitting at reservoir inlet. 5. Remove drain hose from reservoir. 6. Remove evaporator inlet hose from reservoir. 7. Remove water level sensor probe. 8. Remove mounting screws from reservoir bracket, and remove reservoir from icemaker. 9. Reverse to reassemble. BIN CONTROLS (Ice Level Sensors) 1. Disconnect electrical power. 2. Remove front panel. 3. Remove control box cover. 4. Locate bin top, in front of and behind it are two rubber bin control grommets. 5. Pull each bin control out, and in the control box, disconnect the electrical leads connecting the bin control to the circuit board. 6. Reverse to reassemble, be certain that the bin controls are aligned so that the ice level sensors are visible (centered) through the holes in the ice chute. FLOAT VALVE LOCKING TAB VALVE PLUNGER NDE750 December 1993 Page 23

Note: Removal of the auger, water seal, evaporator and gearmotor must begin at the top of the assembly. To Remove the Breaker Bearing Assembly: 1. Remove panels and disconnect electrical power. 2. Unscrew three studs and remove ice chute cover. 3. Unscrew and remove ice sweep. 4. Remove insulation halves from outside of ice chute, lift up and remove ice chute. 5. The breaker may be removed from the auger and evaporator without disturbing the auger. a. Unscrew breaker cover from breaker (left hand threads) b. Unscrew auger stud from top of auger. c. Unscrew 4 allen head cap screws holding breaker to evaporator. d. Lift up, and remove breaker/bearing assembly from auger & evaporator. 6. Service the bearing. Check for rust, rough spots and damage. a. The bearing is pressed into the breaker, to remove the bearing and replace it an arbor press is needed. b. Replace lower seals before installing new bearing in breaker. Note: seals must be pressed in with a tool pushing against the outer edge only, they will not install by hand. Replace parts as required. Re-grease bearing with Scotsman part no. 19-0609-01 bearing grease. Replace top seal, and check the o-rings, replace if cut or torn. 7. Reverse to reassemble: specific tools and 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. ICE SWEEP BREAKER BEARING STEP 5-A STEP 5-B STEPS 5-C AND 6 Moving Parts Hazard. Disconnect electrical power to the icemaker - dispenser before beginning. NDE750 December 1993 Page 24

To Remove the Auger: Turn off the water to the machine, and unclip the evaporator drain hose, pull it down and drain the evaporator into the bin or a container. 1. The top panel must be removed. 2. Remove ice chute cover. 3. Unscrew ice sweep. 4. Remove ice chute body. 5. The auger and breaker/bearing may now be removed as an assembly. a. Unscrew 4 allen head cap screws holding breaker to evaporator. b. Lift up on breaker and remove auger from evaporator. Note: If the auger is stuck, the breaker must be removed from the auger. The breaker may be removed from the auger and evaporator without disturbing the auger. a. Unscrew breaker cover from breaker (left hand threads) b. Unscrew auger stud from top of auger. c. Unscrew 4 allen head cap screws holding breaker to evaporator. d. Lift up & remove breaker from evaporator. e. If the auger is stuck use a slide hammer type puller to pull on the auger at the threaded hole. The size of that hole is 5/8"-18. Inspect the auger, the critical areas of the auger are: 1. The auger body. It should be clean and shining. Sometimes an auger will appear clean when wet, but after it is dry it will be seen to be stained. Scrub the auger with ice machine cleaner and hot water. Ice machine cleaner is an acid. Handle it with extreme care, keep out of the reach of children. 2. The water seal area. Because the auger has been removed, the water seal will have to be replaced. Remove the water seal top half from the auger, and inspect the auger for minerals clean as required. SHARP EDGES! BREAKER/ BEARING/ AUGER ASSEMBLY SLIDE HAMMER PULLER THREAD INTO AUGER Moving Parts Hazard. Disconnect electrical power to the icemaker - dispenser before beginning. NDE750 December 1993 Page 25

To Remove the Water Seal: (Assuming all steps to remove the auger have been performed.) 1. The gearmotor/evaporator assembly will have to be exposed. (See illustration - next page) 2. Remove the 4 hex head cap screws holding the evaporator to the gearmotor assembly. Lift the evaporator up and off of the gearmotor. 3. Remove the snap ring or wire retainer from the grove under the water seal. 4. Pull or drive out the lower half of the water seal. To Replace the Water Seal: 1. Lubricate the water seal with water, and push the water seal into the bottom of the evaporator slightly past the grove for the snap ring. 2. Replace the snap ring and pull the water seal down against it. 3. The part of the water seal that rotates with the auger must also be replaced. Remove the old part from the auger and clean the mounting area. 4. Place a small bead of food grade silastic sealant (such as 732 RTV or Scotsman part number 19-0529-01) on the area of the auger where the water seal is to be mounted. 5. Carefully push the water seal (rubber side against the auger shoulder and the silastic.) /////////////////////////////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 SEAL RETAINING RING FOOD GRADE SEALANT HERE NDE750 December 1993 Page 26

To Replace the Evaporator: (Assuming all the steps for removal of the thrust bearing, breaker, auger, and water seal have been performed.) 1. Recover the refrigerant from the ice maker. 2. Unsweat the refrigerant connections: a) At the thermostatic expansion valve outlet. //////////////////////////////CAUTION/////////////////////////////// Heat sink the TXV body when unsweating or resweating the adjacent tubing. ////////////////////////////////////////////////////////////////////////////// b) At the suction line at the joint about 3" from the evaporator. 3. Remove the evaporator. 4. Unsweat the drier from the liquid line. 5. After installing a new water seal in the new evaporator (see “To Replace the Water Seal”) sweat in the new evaporator at the old tubing connections. 6. Install an new drier in the liquid line. 7. Evacuate the system until dehydrated, then weigh in the nameplate charge. Check for leaks. 8. Install auger, breaker, breaker bearing assembly, and ice discharge chute in reverse order of disassembly. To Reassemble the Evaporator and Auger 1. After the gearmotor has been inspected, fasten the evaporator to the gear motor, be sure that the number of shims indicated on the gear case cover is in place between the gearcase cover and the drip pan gasket. Torque the bolts to 110 inch pounds. 2. Lower the auger into the evaporator barrel, slightly turning it to match up with the drive end. Do Not Drop Into the Evaporator. 3. Complete the reassembly by reversing the disassembly for the breaker & thrust bearing assembly. EVAPORATOR WATER SEAL RETAINING RING DRIP PAN AUGER BEARING BREAKER ICE SWEEP BREAKER NDE750 December 1993 Page 27

(Assuming that the procedures through removal of the water seal have been performed.) 1. Remove the electrical wires from the gear drive motor. 2. Unscrew the 4 cap screws holding the gearmotor to the gearmotor plate. 3. Remove the gearmotor from the icemaker. To Inspect the gearmotor. A) Remove the cap screws holding the gearmotor case halves together and pry the two cases apart. B) To lift off the cover, lift up until you can feel internal contact, then pull the cover towards the output gear end, and then lift the cover (with drive motor attached) up and away from the gear motor case. Note: The case cover output gear, bearings, and shaft are one pressed together assembly. Replace as a unit. C) Inspect the oil, gears, and bearings. If the oil level and condition is acceptable, quickly check the gears and bearings. They are likely to be fine if the oil is. If there is evidence of water in the oil (rusty bearings and gears; the oil having a creamy white appearance; oil level too high) carefully inspect the bearings and gears. If in doubt about the condition of a part, replace it. The oil quantity is 14 fluid ounces, do not overfill. Note: The gears and bearings are available only as pressed together sets. D) After replacing parts as required, (if any) reassemble the gearcase. The two smaller gears and the oil should be in the lower case, the output gear will be with the cover. As you lower the cover onto the lower case, cover will have to be moved closer to the second gear after the output gear has cleared the second gear top bearing. E) After the case is together, and the locating pins are secure in both ends, replace all cap screws. 4. Bench test the gearmotor, check for oil leaks, noise, and amp draw. WATER SHED MOTOR SWITCH BEARING ROTOR SEAL GEAR & BEARINGS GEAR & BEARINGS GASKET GEAR CASE GEARCASE COVER Electrical Shock Hazard. Disconnect electrical power to the icemaker - dispenser before beginning. NDE750 December 1993 Page 28

THIS ICE MACHINE USES HP62 REFRIGERANT AND POLYOLESTER COMPRESSOR OIL. DO NOT USE MINERAL OIL IN THIS REFRIGERATION SYSTEM. ••HP62 is a "Near Azeotrope", and therefore liquid charging is required. Weigh into the discharge side as much as possible of the charge as liquid refrigerant. Install a sight glass between the manifold and ths suction side hose. Carefully meter liquid refrigerant into the suction side, using the manifold valve to "flash off" the liquid before it enters the ice machine. Do this until the proper charge has been weighed into the system. ••When the system is serviced, a special liquid line dryer is required. ••Polyolester oil absorbs water very easily, and therefore when the system is opened for service, it must be re-sealed as soon as possible (15 minutes maximum). ••Special leak detection equipment is required to locate small refrigerant leaks. Usually a leak detector capable of detecting a Halogenated refrigerant or HFC-134A will work. Check with the leak detector manufacturer if in doubt. ••As with any other refrigerant, do NOT mix HP62 with pressurized air when leak testing. ••The vacuum pump or recovery unit should use polyolester oil. VAPOR VAPOR TEMP. PRESSURE TEMP. PRESSURE (DEG F) (PSIG) (DEG F) (PSIG) -20 17 70 146 -18 18 72 150 -16 20 74 155 -14 21 76 161 -12 23 78 166 -10 24 80 171 -8 26 82 177 -6 28 84 182 -4 29 86 188 -2 31 88 194 0 33 90 200 2 35 92 206 4 37 94 212 6 39 96 219 8 41 98 225 10 43 100 232 12 46 102 239 14 48 104 246 16 50 106 253 18 53 108 260 20 55 110 268 22 58 112 275 24 60 114 283 26 63 116 291 28 66 118 299 30 69 120 307 32 72 122 316 34 75 124 324 36 78 126 333 38 81 128 342 40 85 130 351 42 88 132 360 44 91 134 370 46 95 136 379 48 99 138 389 50 102 140 399 52 106 142 409 54 110 144 420 56 114 146 430 58 118 148 441 Pressure-Temperature Chart for HP62 NDE750 December 1993 Page 29

done when it is certain that the system needs repair. ••Refrain from checking refrigeration pressures without reason. Visual inspection of the water system, observation of the ice formation, amp draw, voltage, and other techniques will lead to proper diagnosis. Scotsman also recommends that, at the time of initial start up, gauges not be used. ••If gauges must be used, don’t 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 more important on an ice machine than the high side. ••If gauges must be used, use very short hoses to minimize refrigerant discharged into the air. ••Refrigerant should not be added except as a way to determine the proper operation of the product. If the system was low on refrigerant, there is a leak, and it must be found and repaired. ••This system has a critical charge, it must be recharged with the correct amount of refrigerant as listed on the nameplate of the ice machine, or performance will suffer. ••Anytime the refrigeration system has been opened, the dryer should be replaced. Note: Only a HFC type dryer should be used. ••When brazing the tubing connections to components such as the TXV, the component must be protected by heat sink material. Recover, reclaim or recycle refrigerant. The method chosen is up to the service company. Any refrigerant placed into a Scotsman ice machine must meet ARI spec 700-88. Reclaim programs are available through most refrigerant wholesalers. Access Valves: To use the access valves: Remove the cap from the stem, use a 3/16" allen wrench to check that the valve is CLOSED. The remove the core cap. Close the valve and replace the caps when the job is finished. The valve must be closed and the caps must be on or the valve will leak. Torque Stem Cap to 8-12 ft. lb. Torque Stem to 6-8 ft. lb. Torque Core Cap to 7-12 ft. lb. Access Valves Note: There are no valve cores in this valve. Allen Wrench NDE750 December 1993 Page 30

INSTRUCTIONS FOR USING TESTER, (Optional, order part no. A33942-001) (These instructions assume that the unit will not run, and prior investigation of electric power, controls, and mechanical parts indicates that the electronic circuit may be at fault.) If the "NO WATER" indicator is lit, but inspection shows that the water level in the reservoir is above the top of the water level sensor, OR the "BIN EMPTY" indicator is off while inspection shows that the ice level sensors are properly aligned, clean and not obstructed, use the tester as follows: Bin Control Note: All testing is done with the electrical power on, the master switch on, and all reset switches “reset”. 1. Unplug “photo trans” and “LED” connectors from the circuit board. 2. Plug “photo trans” and “LED” connectors from the tester into the circuit board. a. Move the “bin full” switch on the tester to Full. The light on the tester should be ON. If the light on the tester is not on, the circuit board should be replaced. b. If the light on the tester IS on, move the “bin full” switch to Bin Empty. The light on the tester should go OFF, and the Bin Empty light on the circuit board should go ON. If the Bin Empty light is ON, wait 10-20 seconds for the machine to start, if the machine starts, replace the ice level sensors. If the Bin Empty light does not come ON, the circuit board should be replaced. LED PHOTO TRANS SWITCH TO “FULL” LIGHT GOES ON LIGHT GOES ON LIGHT OFF SWITCH TO “BIN EMPTY” Electrical Shock Hazard. Disconnect electrical power to the icemaker - dispenser before beginning. NDE750 December 1993 Page 31

Water Level 1. Unplug “water sen” connector from control board. 2. Plug “water sen” connector from Scotsman tester into circuit board. a. Move “water” switch on tester to No Water position. The No Water light on the circuit board should go ON. If not, replace the circuit board. b. Move the “water” switch on the tester to the Water position. The No Water light on the board should go OFF. If not replace the circuit board. If the light does go off, replace the water level sensor. If the Bin Empty light is ON, wait 10-20 seconds for the machine to start. The machine should start. LIGHT ON SWITCH TO “NO WATER” WATER SENS SWITCH TO “WATER” LIGHT OFF NDE750 December 1993 Page 32