Service Manual - Scotsman Ice Systems
Contents
1. CIRCUIT BOARD TESTING Water Level 1 Unplug water sen connector from control board 2 Plug water sen connector from Scotsman tester into circuit board LIGHT ON 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 LIGHT OFF WATER SENS MG FRY SWITCH TO SWITCH TO d NO WATER WATER 20 T qU SL e December 1995 Page 362. b Check the water level sensor clean if dirty see maintenance c Check the circuit board see next page If the machine does not start see the next page December 1995 Page 24 NME950R amp FME1200R SERVICE DIAGNOSIS Condition No Ice Being Produced STATUS NOTHING OPERATES F 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 208 230 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 sliding them sideways out of the ice chute 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 bi
3. po o a 8 December 1995 Page 34 CIRCUIT BOARD TESTING Moving Parts Hazard Disconnect electrical power before beginning Bin Control Note Testing is done with the electrical power on the master switch on and all the 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 PHOTO TRANS LED LIGHT GOES ON SWITCH TO FULL NME950R amp FME1200R 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 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 LIGHT GOES ON SWITCH TO BIN EMPTY December 1995 Page 35 NME950R amp FME1200R
4. 4 turn is made 5 After all connections are made and after the king valve has been opened check the couplings for leaks 3 8 LIQUID LINE 1 2 DISCHARGE December 1995 Page 6 NME950R amp FME1200R FOR THE INSTALLER Location TWO UNITS ON ONE CONDENSER REMOTE e CONDENSER ROOF EXCESS precriancen YG ACCESS BUILDING Ne ICE MAKERS SERVICE ACCESS 2 ND SIDE AND BACK WALL CUTAWAY December 1995 Page 7 NME950R amp FME1200R FOR THE PLUMBER FIELD SUPPLIED WATER FILTER HAND SHUT OFF VALVE CONNECT TO COLD WATER VENT BIN DRAIN 3 4 FPT FLOOR DRAIN WATER INLET T 3 8 MALE FLARE Pa SE SI VENT ICE MAKER DRAIN 3 4 FPT December 1995 Page 8 CONFORM TO ALL APPLICABLE CODES Water Inlet The recommended water supply is 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 Drains The cabinet has a 3 4 FPT drain connection The drain is 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
5. FME1200R MAINTENANCE AND CLEANING Moving Parts Hazard Disconnect electrical power before beginning 1 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 base of the ice chute and wipe the inside clean as illustrated 2 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 SLIDE UP TO RESERVOIR WATER LEVEL SENSOR THT TTY CAUTION THE TIP IS MADE OF GLASS MT 3 The top bearing in the breaker should also be checked at least two times per year Check the breaker bearing by eremoving the ice chute cover eunscrewing the ice sweep eremoving the water shed eunscrewing the breaker cover left hand thread eunscrewing the auger stud ICE CHUTE ICE LEVEL SENSORS SLIDE LEFT TO REMOVE Inspect the assembly looking for wear 4 Clean the remote condenser Use a vacuum cleaner or coil cleaner if needed Do NOT use a wire brush 5 Check and tighten all bolts and screws ICE SWEEP BREAKER COVER December 1995 Page 22 MAINTENANCE AND CLEANING In some areas the water supply to the ice maker will have a great deal of minerals in it and that will result in an evaporator and auger becoming coat
6. HERE Head Pressure Control Valve 1 Purge system of refrigerant 2 Break off process tube on the top of the OLD head pressure control valve 3 Unsweat old valve from tubing 4 Unsweat old dryer from tubing 5 Install new valve in place check for correct connections and be sure the number on the side of the valve is 180 6 Wrap the new valve body in wet cloths to heat sink the valve body 7 Sweat in the new valve and the new dryer 8 Evacuate the system and weigh the nameplate charge into the receiver December 1995 Page 33 NME950R amp FME1200R REMOVAL AND REPLACEMENT Gear motor Assembl Moving Parts Hazard Disconnect electrical power before beginning To Remove and Repair the Gear motor Assembly 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 gear motor to the gear motor plate 3 Remove the gear motor from the ice maker To Inspect the gear motor A Remove the cap screws holding the gear motor 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 Charging Procedures Extra care must be taken when recharging this remote system No liquid refriger
7. View Allow 6 above machine for service Liquid Line Connection Discharge Line Connection Remote Condenser Junction Box Electrical Inlet Water Inlet 3 8 Flare Drain 3 4 FPT SPECIFICATIONS ICE MAKER Model Number Dimensions Basic Ice Type Cond HXWXD 208 ounces of R 404A FME1200RE 32A 27 x21 x24 208 230 60 1 Always go by the nameplate FME1200RE 3A same 208 230 60 3 charge NME950RE 32A same 208 230 60 1 NME950RE 3A same 208 230 60 3 The Standard Finish is Enamel Gray There is an optional stainless steel panel kit SPKFM21 available to convert the unit to Stainless Steel It is field installed December 1995 Page 2 NME950R amp FME1200R REMOTE CONDENSER SPECIFICATIONS Model Use with Basic Electrical RCE501 32 1 FME1200R OR 1 NME950R 208 230 60 1 ERC151 32 SAME SAME RCE502 32 1 or 2 FME1200Rs NME950Rs SAME ERC302 32 SAME SAME y ERC DIMENSIONS i A B F G rt 33 36 10 94 16 3 11 5g 87 38 yc CONNECT FITTING ATEK CNet FITTING r 23 1346 z 215 AIR DISCHARGE 1 2 i Z Z AIR TE 14 53 i 5 5 2 2 14 i A C ETIN Emm 1 84 L ARCET 2 07 wm 78 z
8. and or other components not specifically approved by Scotsman Scotsman reserves the right to make design changes and or improvements at any time Specifications and design are subject to change without notice Location After uncrating and inspection the unit is ready for installation It is important that the machine be installed in a location where it has enough space around it to be accessible for service usually a minimum of 6 inches Try to avoid hot dirty and crowded locations Be sure that the location for the machine is within the limitations described on page 3 Storage Bin Tip the storage bin on its back using parts of the carton to protect the exterior finish Install the legs into the threaded holes in the bottom of the bin Turn the leg levelers all the way in preparation for leveling later Return the bin to the upright position remove paper covering the bin gasket Install the bin top according to the directions with the bin top Note Do not push bin into position but lift it there Pushing a bin especially one with ice in it can cause damage to the legs and the leg mounts Ice Maker The machine is heavy so the use of a mechanical lift is recommended for lifting the machine high enough to install on top of the bin After the unit is placed on the bin line it up so it is even with the back side Secure the machine to the bin with the hardware provided with the machine Remove the front panel and remove
9. any shipping blocks Note Be sure to allow a 6 minimum space above the top of the machine for service December 1995 Page 4 NME950R amp FME1200R FOR THE INSTALLER Remote Condenser Location Limited to a 40 foot or a 25 foot length of precharged refrigerant tubing connecting the ice maker to the remote condenser The condenser must be above or level with the ice maker Select the best available location protecting the condenser from extremes of dirt dust and sun Meet all applicable building codes Usually the services of a licensed electrician are required Roof Attachment 1 Install and attach the remote condenser to the roof of the building using the methods and practices of construction that conform to the local building codes including having a roofing contractor secure the condenser to the roof 2 Have an electrician connect the remote condenser fan motor to the ice maker using the junction box at the back of the ice maker PRECHARGED LINE ROUTING CAUTION Do not connect precharged tubing until all routing and forming of the tubing is complete See the coupling instructions page for connecting instructions 1 Each set of precharged refrigerant lines either 25 foot or 40 foot consists of a 3 8 inch diameter liquid line and a 1 2 inch diameter discharge line Both ends of each line have quick connect couplings one end has a schrader valve connection that end goes to the condenser Note The openings in th
10. rigid tubing Storage Bin A separate gravity type drain needs to be run Insulation of this drain line is recommended FOR THE ELECTRICIAN NME950R amp FME1200R 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 TERMINAL STRIP Dy 8 FOR REMOTE CONDENSER a JUNCTION BOX GROUND THE CHASSIS Electrically the remote condenser fan motor is connected to the ice maker at the contactor terminals for the compressor and the fan motor operates whenever the compressor operates Electrical connections are made at the junction box at the back of the ice maker and at the junction box on the remote condenser The remote condenser must be wired to the ice maker in accordance with local and national electrical codes with a minimum of 18 Awg wire with an ground bonding wire connected to the ground screws provided in both the condenser and machine field wiring boxes All outdoor wiring must be in rain proof conduit All external wiring must conform to natio
11. sealing when installed properly Carefully follow the instructions Initial Connections 1 Remove the protector caps and plugs Wipe the seats and threaded surfaces with a clean cloth to be certain that no foreign matter remains on them 2 Lubricate the inside of the couplings especially the O Rings with refrigerant oil eThe 1 2 inch discharge line Schrader valve end goes to the remote condenser fitting marked discharge line eThe 3 8 inch liquid line schrader valve end goes to the remote condenser fitting marked liquid line eThe 1 2 inch discharge line goes to the ice maker fitting marked discharge line eThe 3 8 inch liquid line goes to the ice maker fitting marked liquid line Final Connections 3 Begin tightening the couplings together by hand then using two wrenches it is important that ONLY the nut on the precharged lines be turned the other parts of the couplings must NOT be allowed to turn or the process will tear out the diaphragms and they will be loose in the refrigeration system tighten the coupling until it bottoms out or a definite increase in resistance is felt SCHRADER NO SCHRADER VALVE VALVE B f f a il TO REMOTE TO ICE MAKER CONDENSER P Y m SERVICE PORTS 0 REMOTE CONDENSER 4 Using a marker or pen mark a line lengthwise from the coupling union nut to the bulkhead Then tighten the coupling and additional 1 4 turn As the nut turns the line will show when 1
12. step 6 wash and rinse the water reservoir 12 Go thru steps 13 19 to sanitize the ice machine water system 13 Mix two gallons of sanitizer solution Use an approved sanitizer A possible sanitizer solution may be obtained by mixing two gallons of warm 90 115 F potable water with 1 ounce of household bleach 14 Slowly pout the sanitizer solution into the water reservoir until the float rises then switch the master switch ON 15 As the ice machine uses water from the reservoir continue to pour the sanitizer solution into the reservoir 16 After 1 2 of the sanitizer solution has been added to the reservoir and the reservoir is nearly empty switch the master switch OFF 17 Drain the reservoir and thoroughly wash the interior of the reservoir and cover with sanitizer solution Be sure the drain hose is upright and capped 18 Remove the block from the float in the water reservoir 19 Switch the master switch to ON 20 Continue ice making for at least 15 minutes to flush out any cleaning solution DO NOT USE any ice produced from the cleaning solution Be sure no ice remains in the bin 21 Remove all ice from the storage bin 22 Add warm water to the ice storage bin and thoroughly wash and rinse all surfaces within the bin 23 Sanitize the bin interior by washing the interior of the bin with the balance of the sanitizer solution 24 Switch the master switch ON January 1996 Page 21 NME950R amp
13. E DIAGNOSIS Condition No Ice Being Produced STATUS GEAR MOTOR OPERATES COMPRESSOR DOES NOT A Check the pump down control switch 1 This pressure switch opens at 15 psig and closes at 30 psig If open check the low side pressure if after running the machine the switch opens at a pressure higher than 18 psig replace the switch The pump down control switch could remain open for any of the following reasons Low refrigerant charge auger not turning restricted system TXV not opening liquid line valve not opening 2 Check the low side pressure after starting the pump down switch should remain closed at any pressure higher than 15 psig If less than that 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 begins to operate normal low side pressure being about 30 psig stop and look for a leak recover 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 Recover replace the drier evacuate and weigh in the nameplate charge c Check the liquid line solenoid valve it should have power to it if not Check the connections on the circuit board The liquid l
14. HE INSTALLER Completed Installation A typical installation should generally appear as illustrated below The remote condenser must be located above the ice maker and the precharged lines installed per the instructions on page 6 ROOF CUT AWAY gt INSULATED PRECHARGED REFRIGERANT 2 2d TUBING 12 8 8 MODEL NUMBER SERIAL NUMBER NS A C SUPPLY VOLTAGE MINIMUM CIRCUIT AMPACITY WIRES MAXIMUM FUSE SIZE HERTZ QNA HEATER WATTS PHASE REFRIGERANT CHARGE 02 MOTORS VOLTS RLA FLA W HP LRA COMPRESSOR FAN DRIVE OTHER DESIGN PRESSURE LOW HIGH OF HACR TYPE CIRCUIT BREAKER SCOTSMAN FAIRFAX OPERATION FAIRFAX SOUTH CAROLINA U S A 15 204 ed December 1995 Page 12 NME950R amp FME1200R FOR THE INSTALLER Final Check List 1 Is the ice system installed indoors in a location where the air and water temperatures are controlled and where they do not exceed the design limitations 2 Is there an electrical service disconnect within sight of the installed machine Has the voltage been checked and compared to nameplate requirements 3 Have all the plumbing connections been made and checked for leaks 4 Has the machine and bin been leveled 5 Is there a minimum of 6 clearance at the rear left and right of the machine for proper service access and air circulation 6 Is the water pressure a minimum of 20 p
15. INTRODUCTION To the owner or user The service manual you are 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 system NME950R amp FME1200R The ice machines covered in this manual are a remote condenser type modular ice system that fits a variety of Scotsman storage bins They feature front service for the freezer gear motor control box water reservoir and bin control an electronic circuit for monitoring ice and water level a thermostatic expansion valve and R 404A as the refrigerant TABLE OF CONTENTS Do After Start Up Parts Lists and Wiring Diagrams are located in the center of this manual printed on yellow paper This Manual Was Printed On Recycled Paper February 1995 Page 1 NME950R amp FME1200R FOR THE INSTALLER Either the FME1200R or the NME950R is When installing a new system check to be sure designed to fit the following Scotsman storage bins that you have everything you need before B90 and extensions with bin top KBT18 beginning 800 using bin top KBT15 one unit Correct Bin 800 if using two units no bin top needed Correct Ice Machine BH900 using bin top KBT24 one unit Bin Top BH900 with bin top KBT25 two units side by e All kits legs and information required for the side specific job 550 or HTB500 using bin top KBT 14 Back
16. amp FME1200R OPERATION Water Water enters the machine through the 3 8 male Reservoir overflow or evaporator condensation is flare at the rear of the cabinet goes to the water routed to the drain reservoir which it enters through the float valve The water them goes out the bottom of the reservoir tank to the bottom of the evaporator RESERVOIR DRAIN TUBE WATER LEVEL WATER INLET December 1995 Page 18 NME950R amp FME1200R OPERATION Refrigeration Beginning at the compressor the refrigerant is compressed into a high temperature gas The discharge line directs this gas to the condenser Atthe remote condenser the gas is cooled by air and it then condenses into a liquid This high pressure liquid then goes through the liquid line to the head pressure control valve into the receiver through the liquid line valve and then through 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 Refrigeration Schematic LIQUID LINE 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 evapora
17. ant may be placed in the system at the compressor DO NOT 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 gear motor check for oil leaks noise and amp draw use the access valves at the front of the unit for weighing in the charge All liquid refrigerant must be weighed into the receiver through the front seated king valve FRONT SEATED KING VALVE RECEIVER SERVICE PORT CHARGING 0 CYLINDER umm
18. crews holding breaker to evaporator d Lift up and remove breaker bearing assembly from auger amp 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 A29123 001 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 Note Flaker Components Shown Nugget Similar but Without Slotted Collar Step 5 a Step 5 b ICE Q SWEEP Step 5 c and Step 6 SLOTTED COLLAR December 1995 Page 29 NME950R amp FME1200R HEMOVAL AND REPLACEMENT Auger 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 or if that is not possible the gear motor and freezer assembly must be pulled part of the way out
19. ctions 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 resweat the 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 See To Reassemble Evaporator and Auger To Reassemble the Evaporator and Auger 1 After the gear motor 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 amp thrust bearing assembly DO NOT use the access valves at the front of the unit for weighing in the charge All liquid refrigerant must be weighed into the receiver through the front seated king valve PLACE A BEAD OF FOOD GRADE SEALANT
20. e checked as incorrect phasing will result in a failure of the kit relay December 1995 Page 10 NME950R amp FME1200R FOR THE ELECTRICIAN Fan Relay Kit Phasing Do After Start Up Below is an illustration of the KCMR230 terminal strip Note that each terminal is marked 1 2 3 4 5 6 For proper phasing Terminals 1 and 3 must be connected to the same side of the line such as L1 Terminals 2 and 4 must be connected to the same side of the line such as L2 B Make a test with a volt meter as follows 1 Switch on ice maker 1 first then switch on ice maker 2 The compressors must be operating for this test Do this after start up 2 Test with a volt meter between terminals 2 and 4 then between terminals 1 and 83 Compare the readings obtained to the ones in the following list C Test terminals 1 2 Full Voltage 208 230 Test terminals 1 3 No voltage Test terminals 2 3 Full Voltage Test terminals 2 4 No voltage Test terminals 3 4 Full voltage Test terminals 1 4 Full voltage D If there is full voltage where there should be no voltage turn off ice maker 2 both switches Then turn off ice maker 1 both switches The connections at the KCMR230 terminal strip marked ice maker 1 must be reversed put the wire that was on 1 on 2 and the wire that was on 2 on 1 WARNING Do all wiring with the electrical power disconnected December 1995 Page 11 NME950R amp FME1200R FOR T
21. e building ceiling or wall listed in the next step are the minimum sizes recommended for passing the refrigerant lines through 2 Have the roofing contractor cut a minimum hole for the refrigerant lines of 1 3 4 inch Check local codes a separate hole may be required for the electrical power to the condenser CAUTION DO NOT KINK OR CRIMP REFRIGERANT TUBING WHEN INSTALLING IT 3 Route the refrigerant lines through the roof opening Follow straight line routing whenever possible Any excess tubing MUST be retained within the building ABOVE ICE MAKER 4 Spiral the excess length of pre charged tubing inside the building Use a horizontal spiral as illustrated to avoid any traps in the lines 5 Have the roofing contractor seal the holes in the roof per local codes Note Precharged tubing contains a R 404A holding charge The entire refrigerant charge required for the system is contained in the ice machine Tubing illustration shows tight spiral a spiral in the field depends on tubing limitations Tight spiral not required Traps in tubing not required they are included as part of the Scotsman condenser and ice machine REMOTE CONDENSER SPIRAL EXCESS TUBING INSIDE BUILDING LOCATE REMOTE CONDENSER December 1995 Page 5 NME950R amp FME1200R FOR THE INSTALLER Precharged Lines COUPLING INSTRUCTIONS CAUTION The couplings on the sets of precharged lines are self
22. ed 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 ALLEN SCREWS amp BEARING amp AUGER ASSEMBLY NME950R amp FME1200R 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 and replacement of these parts see REMOVAL AND REPLACEMENT 1 To remove the auger remove the front and top panels 2 Push back bail clamp holding ice chute cover to ice chute and remove cover 3 Unscrew and remove ice sweep 4 Loosen band clamp under ice chute and remove ice chute from evaporator 5 Remove 4 allen screws holding breaker to evaporator 6 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 7 Replace the water seal 8 Reverse to reassemble December 1995 Page 23 NME950R amp FME1200R SERVICE DIAGNOSIS Condition No Ice Being Produced STATUS NOTHING OPERATES A Check Voltage to the unit restore it if there is none Compare to the nameplate B Check The master switch switch ON if off C Check The reset switch high pres
23. from the cabinet To do that a Unclip the electrical wires from the hanger near the drive motor b Remove the bolt holding the gear motor plate c Pull the assembly out 2 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 breaker and BEARING remove auger ASSEMBLY 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 on breaker to remove from auger 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 December 1995 Inspect the auger the critical areas of the auger are a 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 b 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 inspec
24. he power supply Circuit Board Controlling the ice machine through sensors and relays The sensors are 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 liquid line valve ON OFF SWITCH PUMP DOWN CONTROL POTENTIAL RELAY TRANSFORMER CIRCUIT BOARD DA HT 23 SE S Transformer Supplies low voltage to the circuit board Pump Down Control An automatic reset pressure switch connected to the low side of the refrigeration system Controls the compressor Potential Relay The compressor start relay On Off Switch Manual control for the machine CONTACTOR December 1995 Page 16 ELECTRICAL SEQUENCE Refer the wiring diagram as needed 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 eThere is a 15 second delay e f there is enough water in the reservoir the circuit board will allow the machine to start up Start up consists of eThe liquid line relay and auger motor relay become energized connecting power to the liquid line solenoid coil and to the windings of the auger motor eThe liquid line solenoid opens raising the low side pressure eThe pump down control closes eThe auger motor starts and the centrifugal switch closes connec
25. ine or compressor relay on the circuit board may have failed If so replace the circuit board If there is power to the valve the coil may be open or the valve jammed replace the valve Note The pump down control setting changed beginning with May 1995 production CO was 2 CI was 17 December 1995 Page 26 NME950R amp FME1200R SERVICE DIAGNOSIS Condition Low Ice Production STATUS EVERYTHING IS OPERATING A Check the condenser for dirt Clean as required Check the head pressure If the head pressure is very high 1 Check for high air temperatures or restrictive air flow Correct as needed 2 The refrigerant may contain non condensable gases recover evacuate and recharge per nameplate 3 Check the interconnecting refrigerant tubing for kinks or twists Check that the discharge and liquid lines are insulated and do not touch each other where not insulated 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 30 psig If low assume a refrigerant leak locate recover 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 in
26. m ice maker 8 Reverse to reassemble Locking Tabs ICE CHUTE SLIDE BIN CONTROLS IN AND OUT BIN CONTROLS Ice Level Sensors 1 Disconnect electrical power 2 Remove front panel 3 Remove control box cover 4 Locate ice chute at the base of the chute in front of and behind it are two plastic bin control mounts 5 Slide each bin control to the left 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 December 1995 Page 28 NME950R amp FME1200R REMOVAL AND REPLACEMENT Bearing And Breaker Note Removal of the auger water seal evaporator and gear motor must begin at the top of the assembly To Remove the Breaker Bearing Assembly AWARNING Moving Parts Hazard Disconnect electrical power before beginning 1 Remove panels and disconnect electrical power 2 Push back bail clamp and remove ice chute cover 3 Unscrew and remove ice sweep 4 Remove insulation halves from outside of ice chute loosen band clamp under 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 the breaker cover from breaker left hand threads b Unscrew auger stud from top of auger c Unscrew 4 allen head cap s
27. move the cap from the stem use a 3 16 allen wrench to check EERE 92 206 that the valve is CLOSED The remove the core cap A vac gf 94 212 eClose the valve and replace the caps when the job is finished CENE b d e The valve must be closed and the caps must be on or the 10 43 100 1 232 valve will leak 12 oe 46 102 1 239 14 48 104 246 18 5 22350 106 253 18 5 22359 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 Torque Stem Torque Cap 32 72 122 316 to 6 8 ft Ib to 8 12 ft Ib 34 75 124 324 36 78 126 333 38 81 128 342 55 40 85 130 351 p VALVE 42 88 132 360 44 91 134 370 b 50 102 140 399 52 106 142 409 54 110 144 420 56 114 146 430 58 118 148 441 60 123 150 452 62 127 152 464 64 132 154 475 66 136 156 487 68 141 158 499 December 1995 Page 32 NME950R amp FME1200R REMOVAL AND REPLACEMENT Evaporator Charging Procedures Extra care must be taken when recharging this remote system No liquid refrigerant may be placed in the system at the compressor To Replace the Evaporator Assuming all the steps for removal of the thrust bearing breaker auger and water seal have been performed 1 Discharge the refrigerant from the ice maker 2 Unsweat the refrigerant conne
28. n 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 WAIT TTL CAUTION THE TIP IS MADE OF GLASS AUT 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 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 END OF THE MANUAL December 1995 Page 25 NME950R amp FME1200R SERVIC
29. nal state and local electrical codes The use of a licensed electrician is required to perform the electrical installation RAIN PROOF CONDUIT December 1995 Page 9 NME950R amp FME1200R FOR THE ELECTRICIAN Fan Relay Kit WARNING Do all wiring with the electrical power disconnected To install the KCMR230 fan relay kit when using 2 230 VOLT ice makers and one 230 volt two circuit remote condenser See the remote condenser nameplate for current requirements to determine wire size to be used for electrical hookup Refer to wiring diagram All external wiring should conform to the national state and local electrical codes Usually an electrical permit and services of a licensed electrician will be required 1 Mount the control box in a convenient location 2 Attach a solid earth ground wire to the ground screw POSSIBLE LOCATION FOR KCMR230 CONTROL BOX 3 Route connecting wires from the first ice maker junction box marked condenser fan and connect it to the KCMR230 terminal strip marked NO 1 ICE MACHINE 4 Route connecting wires from the second machine junction box marked condenser fan and connect it to the KCMR230 terminal strip marked NO 2 ICE MACHINE 5 Route connecting wires from KCMR230 terminal strip marked TO REMOTE FAN and connect at the remote condenser junction box 6 Check phasing of the electrical circuit as follows A The phasing of the wiring MUST now b
30. nstalled correctly according to the final check list on page 13 Start Up 1 Go through the pre start inspection 2 Open the 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 Open the King Valve 4 Turn the master switch on The electrical start up sequence is now on automatic A There should be a short 15 second delay before the gear motor starts B After the gear motor starts the liquid line valve will open the low pressure control will close and the compressor will start 5 The remote condenser fan turns and the condenser begins to discharge warm air 6 The unit should soon be making ice if desired the low side pressure may be checked it should be 32 psig or 2 psig The discharge pressure will depend upon air and water temperatures but should be between 200 psig and 280 psig 7 THERE ARE NO ADJUSTMENTS TO MAKE so replace the panels 8 Clean and or sanitize the storage bin interior wipe off the exterior with a clean damp cloth 9 Give the owner user the service manual instruct him her in the operation of the unit and make sure they know who to call for service 10 Fill out the warranty registration and mail it to the Scotsman Factory December 1995 Page 14 COMPONENT DESCRIPTION Control Box Contains the electrical controls that operate the machine High Pressure Cut Out A man
31. ntenance and Cleaning should be scheduled at a minimum of twice per year _ ICE MAKING SYSTEM In place cleaning 1 Check and clean any water treatment devices if any are installed 2 Remove screws and front and top panels 3 Move the ON OFF switch to OFF 4 Remove all the ice from the storage bin 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 solution should be between 90 and 115 degrees F Scotsman Ice Machine Cleaner contains acids These compounds may cause burns If swallowed DO NOT induce vomiting Give large amounts of of water or milk Call Physician immediately In case of external contact flush with water Keep out of the reach of children AWARNING 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
32. seal was leaking it would be a good idea to inspect the interior of the gear motor NME950R amp FME1200R Water Seal REMOVAL OF THE WATER SEAL WATER SEAL RETAINING gt RNG TAL December 1995 Page 31 NME950R amp FME1200R REFRIGERATION SYSTEM SERVICE Pressure Temperature Chart for HP62 This ice machine uses R 404A HP62 refrigerant and polyolester oil Do VAPOR VAPOR NOT use mineral oil in this refrigeration system TEMP PRESS TEMP PRESS e R 404A is a Near Azeotrope so liquid charging is required DEG F PSIG DEG F PSIG eWhen the system is serviced a special liquid line drier is required Itis 20 17 70 146 included with replacement compressors 18 18 72 150 HP62 is not compatible with mineral oil so these ice machines use 216 3x D 74 155 Polyolester oil Polyolester oil absorbs water very easily When of 14 21 76 161 these refrigeration systems is opened for service it must be re sealed 12 23 78 166 as soon as possible 15 minutes maximum 10 24 80 171 e Special leak detection equipment is required to locate small refrigerant 8 26 82 177 leaks Usually a leak detector capable of detecting a Halongenated 6 28 84 182 refrigerant or HFC 134a will work Check with the leak detector 4 29 86 188 manufacturer if in doubt 3s ee sud 88 194 Access Valves To use the access valves 0 33 90 200 e Re
33. sig 7 Has the machine been secured to the bin 8 If two units on one condenser has the relay kit been installed 9 Is there a water shut off valve installed near the machine 10 Is the remote condenser installed per local building codes and in a place where it has adequate ventilation and minimal solar heat gain 11 Has all shipping material and literature inside the front panel been removed from the units 12 Have the remote condenser and precharged lines been properly installed 13 Has the electrical connection between the ice maker and the condenser been made REMOTE CONDENSER SECURED 14 Verify that the master switch is in the OFF position ROOF HOLES SEALED SUPPLY LEVELED PLUMBING 15 Switch on the electrical power 16 Refer to Pre Start instructions the next page December 1995 Page 13 NME950R amp FME1200R START UP Pre Start Inspection 1 Remove the front left and right side service panels 2 Check that any styrofoam shipping blocks have been removed 3 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 turns freely remote condenser 4 Check that the refrigerant lines are properly installed 5 Check that the electrical power has been on for at least 4 hours and that the compressor dome is warm 6 Check that the unit is i
34. ssure the valve opens up the liquid line from the condenser to the receiver SCHEMATIC OF DISCHARGE PRESSURE CONTROL VALVE Low Temperature 14414 Compressor gt To Receiver From Condenser OPERATION Refrigeration PUMP DOWN During the pump down cycle usually initiated by the circuit board de energizing the liquid line valve the discharge gases flow through their normal path to the remote condenser through the head pressure control and into the receiver At this point the refrigerant flow is stopped by the closed liquid line valve This action forces the refrigerant into the receiver and keeps it out of the compressor The pump down continues until the low pressure control turns the compressor off December 1995 Page 20 NME950R amp FME1200R MAINTENANCE AND CLEANING 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 Mai
35. sulation 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 D Refrigerant charge On this model the refrigerant charge is adequate whenever the receiver has enough liquid refrigerant to maintain liquid refrigerant at the TXV HOWEVER the condensing temperature will have a definite bearing on this A unit with a marginal charge in summer will be undercharged when the outside air temperature drops The only correct way to charge this unit is to weigh in the nameplate charge December 1995 Page 27 NME950R amp FME1200R REMOVAL AND REPLACEMENT Water Reservoir amp Bin Controls WATER RESERVOIR 1 Shut off the water supply to the ice maker 2 Remove front panel and reservoir cover 3 To remove float only disconnect water inlet compression fitting at reservoir inlet 4 Push in the tab behind the reservoir and pull the valve assembly up and out of the reservoir tank FLOAT 5 To remove reservoir remove drain hose from ASSEMBLY reservoir 6 Remove evaporator inlet hose from reservoir D 7 Remove mounting screws from reservoir bracket and remove reservoir fro
36. sure depress and release the switch If the unit still does not start check the spout for too much ice or high side pressure D Check the high pressure cut out switch 1 This pressure switch opens at 400 psig Check the high side pressure reset the switch and observe that the fan is forcing air through the condenser If the switch opens at pressures below 400 psig replace the switch If the pressures rise above the trip out point and the unit shuts down a Check for adequate air flow Clean the condenser 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 b Check the head pressure control valve it should be maintaining a head pressure above 220 psig If the unit has the correct charge and the condenser is clean and the refrigerant lines are not kinked or twisted and the condenser is not overheated by external heat loads the head pressure should be under the trip out point of the head pressure control switch If all of the above are found to be good and the machine trips out on high head pressure replace the head pressure control valve E Check the water level If there is not enough water in the reservoir the water level sensor will keep the machine from starting a Check the water level restore adjust if low
37. t the auger for minerals clean as required STOP JI 7 SLIDE HAMMER PULLER REMOVING i AUGER THREAD INTO AUGER DRIVE SLIDE UP AGAINST STOP TO LOOSEN AUGER Page 30 REMOVAL AND REPLACEMENT To Remove the Water Seal Assuming all steps to remove the auger have been performed 1 The gear motor evaporator assembly will have to be pulled away from the machine if not yet done 2 Remove the 4 hex head cap screws holding the evaporator to the gear motor assembly Lift the evaporator up and off of the gear motor 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 6 Allow the auger and seal to air dry until the silastic is dry on the surface 7 If the original water
38. ting power to the compressor contactor coil eThe 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 NME950R amp FME1200R Shut Down consists of eThe liquid line solenoid closes lowering the suction pressure eThe pump down control opens eThe compressor contactor opens eThe compressor stops eThe auger motor is run by the circuit board for 2 more minutes clearing out ice in the evaporator and then eThe 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 e When the water level in the reservoir falls below the water level sensor the machine will shut down e When the water refills the reservoir the machine will start up again Separate from the circuit board eThe high pressure control will stop the machine immediately if it opens It is manually reset at the control eThe master switch is the manual control for the complete machine but it is not a service disconnect December 1995 Page 17 NME950R
39. tor the refrigerant now a low pressure vapor goes through the suction line back to compressor where the cycle is repeated System Information 90 F air and 70 F water eSuction pressure 35 PSIG e Discharge pressure 255 PSIG eMinimum Discharge pressure low temp 180 PSIG Compressor Amps 93 Phase 2 8 eSingle Phase 4 3 REMOTE CONDENSER pee DETAIL OF HEAD PRESSURE CONTROL m VALVE THERMOSTATIC LIQUID LINE EXPANSION VALVE VALVE Pee dn HEAD PRESSURE CONTROL VALVE ie a E qr VERLA N RECEIVER PLLA 822522 E MET A T au 222 LEZ EVAPORATOR COMPRESSOR December 1995 Page 19 NME950R amp FME1200R OPERATION Refrigeration Low Condensing Temperature The refrigeration system under low condenser air temperatures is much the same as it is under higher temperatures with the exception that the resulting low head pressures cause the head pressure control to close off the liquid line between the condenser and the receiver This forces more SCHEMATIC OF DISCHARGE PRESSURE CONTROL VALVE Normal Temperature Valve Disk From Compressor To Receiver From Condenser refrigerant into the condenser with a small amount of discharge gas going into the receiver to maintain pressure until the head pressure is built back up to the rated gauge pressure of 180 psig At that pre
40. ual reset switch sensing the high side refrigeration pressure It is set to shut the machine off at 400 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 CONTROL BOX HIGH PRESSURE CUT OUT COMPRESSOR NME950R amp FME1200R Ice Discharge Chute Directs the ice produced by the evaporator into the storage bin 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 Gear Motor An oil filled speed reduction gearbox driving the auger Cleaning Drain Tube When uncapped and lowered drains the evaporator Compressor The refrigerant vapor pump Expansion valve The refrigerant metering device EXPANSION VALVE ICE CHUTE WATER LEVEL SENSOR RESERVOIR CLEANING DRAIN TUBE EVAPORATOR GEAR MOTOR ICE LEVEL SENSOR December 1995 Page 15 NME950R amp FME1200R COMPONENT DESCRIPTION Control Box Contactor A definite purpose contactor connecting the compressor and the remote condenser fan motor to t
41. w MET ANTE Other Required Items RTE25 Precharged line set 25 R 404A or RTE40 Precharged line set 40 R 404A 1 35 KCMR230 Fan Relay Kit used when two 230 volt 32 ice makers are on one 230 volt 32 two circuit condenser MODEL NUMBER SERIAL NUMBER A C SUPPLY VOLTAGE MINIMUM CIRCUIT AMPACITY WIRES MAXIMUM FUSE SIZE HERTZ HEATER WATTS PHASE REFRIGERANT CHARGE 02 MOTORS VOLTS RLA FLA W HP LRA COMPRESSOR FAN DRIVE OTHER DESIGN PRESSURE LOW HIGH OF TYPE CIRCUIT BREAKER SCOTSMAN FAIRFAX OPERATION FAIRFAX SOUTH CAROLINA U S A ICE MAKER NAMEPLATE LOCATED ON BACK PANEL SERIAL PLATE LOCATED BEHIND FRONT PANEL December 1995 Page 3 NME950R amp FME1200R FOR THE INSTALLER Installation Limitations This ice system is designed to be installed indoors in a controlled environment Min Max Air Temperature 50 F 100 F Not including the remote condenser Water Temperature 40 F 100 F Water Pressure 20 PSIG 80 PSIG Voltage 5 10 Compared to the nameplate Operating the machine outside of the limitations is misuse and can void the warranty Scotsman Ice Systems are designed and manufactured with the highest regard for safety and performance They meet or exceed the standards of UL NSF and CUL Scotsman assumes no liability or responsibility of any kind for products manufactured by Scotsman that have been altered in any way including the use of any part
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