FM2400RH - Scotsman Ice Systems
Contents
1. and remove ice chute 5 The breaker may be removed from the auger and evaporator without disturbing the auger a Use spanner wrench and 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 amp evaporator 6 Service the bearing Check for rust rough spots and damage Step 5 a Step 5 b ICE SWEEP SPANNER WRENCH use on units built before 1991 ZT BREAKER COVER 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 Step 5 c and Step 6 BEARING __ C3 SEALS es cy f lar SLOTTED Fret I COLLAR Gi Ra amp Va DIV2. circuit board with the ELECTRICAL POWER OFF checked out Make all connections to the ITT INSTRUCTIONS FOR USING TESTER model FC1 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 Reset indicator located in the reset switch is off and 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 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 PHOTO TRANS LIGHT GOES tester as follows 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
3. 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 OFF ON SWITCH TO BIN EMPTY SWITCH TO FULL August 1994 Page 26 CIRCUIT BOARD TESTING 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 August 1994 Page 27 FM2400RH
4. running with a minimum of problems Maintenance and Cleaning should be scheduled at a minimum of twice per year LLL MTT TTNN AARNING I HT Electrical power will be ON when doing in place cleaning Switch it OFF before completing the cleaning procedures LLL ICEMAKING SYSTEM In place cleaning 1 Check and clean any water treatment devices if any are installed 2 Pull out and remove the front panel 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 ITA TTINNARNING I THT Scotsman Ice Machine Cleaner contains Phosphoric and Hydroxyacetic acids These compounds are corrosive and 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 A 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 m
5. the bin extension BX87 install heavy duty leg kit KLP4 and place the bin into position Remove the paper tape from the bin edge gasket and install the bin extension onto the B90 Remove the paper tape from the bin extension top edge and using a mechanical lift install the FM2400RH onto the top of the storage bin assembly Fasten the ice machine to the bin using 4 5 15 18 2 5 cap screws Level the assembly by a Turning the leg levelers in or out on the standard legs b Use shims under the heavy duty legs of the KLP4 Locate the Nameplate The nameplate is located on the back panel of the machine and contains the electrical characteristics particular to the unit being installed BX87 BIN EXTENSION 2 7 B90 STORAGE BIN Refrigeration Installation MUM AUTON The skills of a refrigeration technician are required The FM2400RH 32B comes with a dry nitrogen to connect the ice machine to the buildings holding charge Purge and evacuate before refrigeration system connecting to a refrigeration system TULL Local Codes must be observed A P trap should be installed where there will be more than 10 of vertical rise in the suction line FOR THE ELECTRICIAN CONFORM TO ALL APPLICABLE CODES August 1994 Page 3 FM2400RH Electrical Connections Locate the nameplate for the current requirements and then determine the wire size and type per the National Electric Code The ma
6. the master switch but is otherwise ready to go switching the master switch to on and pressing the start reset switch does the following The bin empty light on the circuit board goes on There 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 The liquid line 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 liquid line valve coil The liquid line valve opens and the refrigerant flows to the thermostatic expansion valve and into the evpaorator 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 FM2400RH Shut Down consists of The liquid line relay opens The liquid line valve closes ice making stops The auger motor is run by the circuit board for 2 5 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
7. 8 FM2400RH A Check the liquid line valve relay The relay is on the circuit board if it does not supply power to the liquid line valve the valve will not open 1 Check for power at the valve coil if none a Check for power at the liquid line valve relay at the circuit board If there is power at the relay but none at the liquid line valve coil Check for an open wire between the relay and the valve 2 Check the valve coil If the coil is open replace the liquid line valve 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 liquid line valve relay on the circuit board has power on the NO contact but not on the COM contact replace the circuit board August 1994 Page 19 FM2400RH REMOVAL AND REPLACEMENT WATER RESERVOIR 1 Shut off the water supply to the icemaker 2 Remove front panel and reservoir cover 3 To remove float only A models 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 B models disconnect water inlet tube push in the tab behind the reservoir and pull valve assembly out of the reservoir tank 4 To remove reservoir disconnect water inlet compression fitting at reservoir inlet 5 Remove drain hose from reservoir 6 Remove
8. ADJUST THE TXV UNTIL THE EPR HAS BEEN SET The superheat setting is 4 8 F Measure the temperature of the evaporator outlet at the TXV bulb and check the low side pressure at the EPR valve Convert the pressure to temperature using a temperature pressure chart and subtract the amount from the outlet temperature The result is the superheat Use an electronic thermometer EPR Evaporator Pressure Regulator Valve This valve maintains a constant pressure on it s inlet evaporators side regardless of the pressure on the outlet suction side The EPR is factory set adjust only if needed After adjusting check TXV superheat Evaporators Where the water is frozen into ice crystals As the water cools it begins to turn into ice and the slowly turning auger lifts the ice as it is being made and forces it up and out of the breaker or spout where the extra water is compressed out of the ice The ice then drops through the chute into the storage bin EPR VALVE 5 THERMO THERMO VALVE LIQUID LINE VALVE EVAPORATOR August 1994 Page 8 FM2400RH COMPONENT DESCRIPTION Control Box 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 Transformer Supplies low voltage to the circuit
9. D SUPPLIED WATER FILTER WATER INLET BIN DRAIN A FLOOR DRAIN Eer August 1994 Page 5 FM2400RH FOR THE INSTALLER Final Check List 1 Is the unit installed where the air and water temperatures are within and will remain within the limitations for the unit 2 Is there 6 clearance at the rear of the machine for utility connections 3 Has the water supply line be checked for pressures between 20 and 120 4 Has the unit been leveled 5 Has the shipping material been removed from inside the cabinet 6 Have the electrical connections been made 7 Have the drains been installed and checked for leaks 8 Has the refrigeration supply been installed and checked for leaks 9 Has the bin and cabinet been wiped clean or sanitized 10 Has the warranty registration card been properly filled out and mailed to Scotsman 11 Has the owner been given the service manual and been instructed on how to maintain the icemaker 13 Has the owner been given the name and telephone number of the local Scotsman service agency August 1994 Page 6 FM2400RH INITIAL START UP 1 Remove the top and front panels 7 Switch on the other master switch observe that The liquid line valve opens 2 Open the water valve and observe that the two The gearmotor runs float reservoirs fill up with water and shut off Within a short time that side of the machine begins to make ice 3 Switch on the electrical po
10. FM2400RH TO THE OWNER OR USER The service manual you are reading is intended to gearmotors two liquid line valves two control provide you and the maintenance or service boxes two thermostatic expansion valves and an technician with the information needed to install EPR valve start up clean maintain and service this ice system The FM2400RH remote high side is the freezer portion of a commercial ice machine It is designed to be connected to the condensing section of a refrigeration system specifically a supermarket R 502 system It consists of two evaporators two Parts lists and wiring diagrams are in the center of this manual printed on yellow paper August 1994 Page 1 FM2400RH FOR THE INSTALLER Specifications The FM2400RH is designed to fit the Scotsman storage bins BH800 or B90 Leg kit KLP4 is recommended when using both the B90 bin and an extension Installation Limitations The FM2400RH is BACK VIEW lt 15 53 _ 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 sie LINE CONNECTION 7 LIQUID LINE CONNECTION 12 o O he 21 66 designed for indoor installations only The machine must also be in a controlle
11. IDER August 1994 Page 21 FM2400RH REMOVAL AND REPLACEMENT TTT INNEXRNUNG IT TT Disconnect electrical power Handle the auger with care it has sharp edges MTT 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 Loosen band clamp and 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 DIVIDER evaporator without disturbing the auger a Use spanner wrench and 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 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 ma
12. 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 f the spout switch opens the machine will stop immediately through the relays on the circuit board and cause the reset switch on the circuit board to light up It must be manually reset at the reset switch on the circuit board The master switch is the manual control for each system but it is not a service disconnect August 1994 Page 11 FM2400RH OPERATION Water Reservoir overflow or evaporator condensation is Water enters the machine through the 3 8 male routed to the drain flare at the rear of the cabinet goes to the water Water cooled models have a separate water reservoir which it enters through the float valve circuit for the cooling water it enters the fitting The water then goes out the bottom of the at the rear goes to the water regulating valve reservoir tank to the bottom of the evaporator then to the water cooled condenser and then down the drain WATER SCHEMATIC WATER INLET EVAPORATOR WATER INLET DRIP PAN DRAIN August 1994 Page 12 OPERATION Refrigeration The remote high side LIQUID supplies high pressure LINE liquid R502 to the liquid a aioe eee line connection on the Pe ae ice machine After the Sohal sight glass there are two separate liquid lines each
13. a FM2400RH 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 MMMM GAO TIONM TLL Do not get any silastic onto the face of the seal LLL 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 FOOD EALANT RE August 1994 Page 23 FM2400RH REMOVAL AND REPLACEMENT Evaporator To Replace the Evaporator Assuming all the steps for removal of the thrust bearing breaker auger and water seal have been performed 1 Shut the hand valves in the liquid and suction lines to the evaporator being serviced then discharge the refrigerant 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 connections 6 Install an new drier in the liquid line 7 Evacuate the system until de
14. board On Off Switch Manual control for that side of the machine Reset Switch Manual reset Glows when the unit shuts off from the ice discharge chute being overftilled pressure of the ice opening the microswitch at the top of the chute Not used on FM2400RH 32B ON OFF SWITCH TRANSFORMER CIRCUIT BOARD TERMINAL STRIP RESET SWITCH Early Models Only August 1994 Page 9 FM2400RH COMPONENT DESCRIPTION Evaporator Evaporator A refrigerated vertical tube filled Motor A permanent split capacitor motor that water and containing a water seal and auger drives the gear reducer Auger A solid stainless steel double spiral auger Bearing As the ice is pushed up the evaporator it pushes the ice crystals up to the top of the the auger is thrust down and pressure from the evaporator auger thrust is taken up by this bearing 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 Divider Where the ice is compressed and much of the extra water is squeezed out of it before it is BEARING ICE SWEEP DIVIDER EVAPORATOR WATER SEAL discharged into the bin August 1994 Page 10 ELECTRICAL SEQUENCE Refer the wiring diagram as needed Each system is separate If the machine is switched off at
15. chine cleaner and hot water MLINNARNINGITT LTT Ice machine cleaner is an acid Handle it with extreme care keep out of the reach of children MTT 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 SLIDE HAMMER PULLER THREAD INTO THE AUGER HERE August 1994 Page 22 REMOVAL AND REPLACEMENT MATT TLNN ARNUING T THT Disconnect the electrical power to the machine at the building source BEFORE proceeding with any repair IAT 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 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 al res RETAINING s RING 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 are
16. chine requires a solid chassis to earth ground wire Refer to the wiring diagram The ice machine should be connected to it s own electrical circuit and be individually fused Voltage when the unit is under full load must remain within the limitations listed on page 2 LOW VOLTAGE CAN CAUSE EQUIPMENT MALFUNCTION AND OR DAMAGE All external wiring should conform to the National State and local electrical codes Usually the services of a licensed electrician will be required DETAIL OF JUNCTION BOX JUNCTION BOX POWER SUPPLY SO ve l on Sa AN a ap August 1994 Page 4 FM2400RH FOR THE PLUMBER CONFORM TO ALL APPLICABLE CODES Drain System All drains are of the gravity type and must have a minimum of 1 4 fall per foot of horizontal run The drains must be installed to conform to local plumbing codes The use of a vent at the machine and at the bin will allow the system to drain properly Use only rigid tubing for drains insulation of the bin drain is recommended SHUT OFF Se Pa Water Supply The recommended water supply line is 3 8 O D copper tubing with a minimum operation pressure of 20 PSIG and a maximum of 120 PSIG Connect to cold water using the male flare connection at the back of the machine Install a shut off valve in an accessible space between the ice maker and the water supply 3 8 MALE FLARE 3 4 FPT VALVE SB SS e 4 VENT THIS DRAIN FIEL
17. d environment where the air temperature does not fall below 50 F or go above 100 F The water temperature must be between 40 F and 100 F The electrical power supply must not drop below 5 of the lowest nameplate voltage or go above 10 of the highest nameplate voltage SPECIFICATIONS Scotsman Ice Systems are designed and manufactured with the highest regard for safety o ELECTRICAL INLET POTABLE WATER INLET 3 8 FLARE DRAIN 3 4 FPT 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 Model Number Dimensions w o Bin Ice Basic Minimum Maximum BTU s H x W D Type Electrical Circuit Fuse Required Ampacity Size FM2400RH 32B 27 X 42 X 24 Flake 208 230 60 1 2 7 15 16 000 August 1994 Page 2 FM2400RH FOR THE INSTALLER Select the Location The unit can only be installed indoors TYPICAL INSTALLATION ALLOW ROOM FOR SERVICE ACCESS within the limitations described on page 2 The ice machine will have to be connected to the buildings R502 FM2400RH refrigeration system check to be sure that the system has enough extra capacity to handle a minimum of additional 16 000 BTU s per hour 110 F liquid line temperature assume a oF evaporator temperature Storage Bin Scotsman s B90 will be the presumed bin of choice If using
18. evaporator inlet hose from reservoir 7 Remove mounting screws from reservoir bracket and remove reservoir from icemaker 8 Reverse to reassemble FLOAT 2 ASSEMBLY FLOAT MOUNTING 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 cube chute CHUTE SLIDE BIN CONTROLS IN AND OUT FLANGES A Model Internal Plunger Float Valve B Model A se August 1994 Page 20 FM2400RH REMOVAL AND REPLACEMENT Bearing And Breaker Note Removal of the auger water seal evaporator and gearmotor must begin at the top of the assembly To Remove the Breaker Bearing Assembly MTT HINNAARNUING T HT Disconnect the electrical power to the machine at the building source BEFORE proceeding with any repair I 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 loosen band clamp under ice chute lift up
19. formation on removal of these parts see REMOVAL AND REPLACEMENT 1 To remove the auger remove front and top panel If top panel cannot be removed or if there is less than 6 clearance over the top of the machine the gearmotor evaporator may be slid out for service access See Removal And Replacement 2 Remove 3 hex studs 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 head screws holding breaker to evaporator 6 Pull up on breaker to remove auger Allow the auger to dry the stainless steel of the auger and evaporator must be clean and bright Clean the auger and evaporator as required DO NOT HONE THE EVAPORATOR 7 Replace the water seal 8 Reverse to reassemble August 1994 Page 16 FM2400RH 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 on the circuit board depress and release the switch If the still does not start check the spout switch D Check the spout switch It opens from excess pressure of ice inside the ice chute this should only happen when the machine does not shut off when the ice storage bin is full This switch will reset when the ice melts but the machine will not resa
20. 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 STATUS GEARMOTOR OPERATES BUT NO ICE IS MADE August 1994 Page 1
21. hydrated 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 BEARING To Reassemble the Evaporator and Auger 1 After the gearmotor has been inspected fasten the evaporator to the gear motor 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 AUGER EVAPORATOR DRIP PAN DIVDER BREAKER August 1994 Page 24 FM2400RH REMOVAL AND REPLACEMENT Gearmotor To Remove and Repair the Gearmotor D After replacing parts as required if any Assembly reassemble the gearcase The two smaller gears Assuming that the procedures through removal of and the oil should be in the lower case the output the water seal have been performed gear will be with the cover As you lower the cover 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 ice maker 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 in
22. leading to a liquid line valve When the individual ice level sensor causes the circuit E board to energize the m HAND VALV liquid line valve the valve opens allowing S D the liquid refrigerant to LIQUID LINE P VALVE AD enter that expansion THERMO VALVE valve The thermostatic expansion valve meters the liquid refrigerant into SUCTION LINE EPR VALVE August 1994 Page 13 FM2400RH the evaporator where it boils off evaporates and absorbs heat It then moves through the ball valve and into the evaporator pressure regulator valve or EPR The EPR keeps the evaporator pressure above a predetermined point even though the suction line pressure of the remote high side system may vary The refrigerant now a low pressure gas moves into the suction line of the remote high side system FM2400RH MAINTENANCE AND CLEANING ITT 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
23. ore 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 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 UHN ARNINGITTT IH DO NOT USE any ice produced from the cleaning solution Be sure no ice remains in the bin LLL 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 with an approved sanitizer using the directions for that sanitizer 18 Replace the front panel August 1994 Page 14 FM2400RH MAINTENANCE MM TLINNARNINGITL TIL Disconnect electrical power before beginning MT 1 The bin control uses devices that sense light PEEL z therefore they must be kept clean enough so that CONTROLS OUT they can see At least twice a year remove the OF CHUTE bin control sensors from the base of the ice chute Pa 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
24. rt until the reset switch on the circuit board is pressed E 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 August 1994 Page 17 FM2400RH SERVICE DIAGNOSIS Condition No Ice Being Produced STATUS NOTHING OPERATES F Check The gear motor if it will not run the liquid line valve will not open 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 Ifthe 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 Testor Model NM1 into the circiut board a Move the bin
25. ternal 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 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 DS _ BEARING August 1994 Page 25 FM2400RH CIRCUIT BOARD TESTING MTT TTNNERNNGI LLII These procedures require the machine to be connected to the power supply The voltages of the electronic circuit are very low but HIGHER VOLTAGES ARE PRESENT IN THE UNIT Do not touch anything but the tester while the unit is being
26. the CLEAN THE ICE LEVEL CONTROL SENSORS 4 Check and tighten all bolts and screws CLEAN THE WATER LEVEL SENSOR MATTE CAUTION THE TIMP IS MADE OF GLASS ICE SWEEP MTT SPANNER WRENCH only needed on units mfg before reservoir and the tip wiped clean of mineral 1991 buildup 3 The bearing in the breaker should also be checked at least two times per year Check the bearing by removing the ice chute cover unscrewing the ice sweep removing the water shed using a spanner wrench and 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 August 1994 Page 15 FM2400RH CLEANING In some installations the water supply to the icemaker will be so concentrated with dissolved minerals such as calcium carbonate that as ice is made the evaporator and auger become coated with the minerals requiring a more frequent cleaning 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 ALLEN HEAD DIVIDER AUGER SCREWS AND SLOTED COLLAR Switch off electrical power and shut off the water suplly For more in
27. wer Waiter flows from the water reservoir and the float drops letting in more water 4 Open the hand valves in the liquid lines 8 With both sides operating the sight glass should remain full and the low side pressure will be about 30 psig or 4 psig Gearmotor amp draw should not exceed the nameplate rating 5 Open the ball valves in the suction lines 6 Switch on one master switch and observe The liquid line valve opens 9 Check the system very carefully for any The gearmotor runs refrigerant leaks repair as needed Within a short time that side of the machine begins to make ice Water flows from the water reservoir and the float drops letting in more water August 1994 Page 7 FM2400RH COMPONENT IDENTIFICATION Liquid line valve s These valves operate to turn the ice making process on and off When the ice level drops in the ice chute the ice level sensor will cause the circuit board to close the liquid line relay which energizes the liquid line valve for that side of the system The liquid line valve opens and liquid refrigerant flows to the thermostatic expansion valve Thermostatic Expansion Valve The metering device of each system the valve s sense the temperature of the suction line and vary the amount of liquid refrigerant that passes through the valve into the evaporator thus maintaining a constant level of refrigeration TXV s are factory set Do not adjust unnecessarily DO NOT
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