MV 12 MV 21 MV 32 MV 50
Contents
1. Page 20 NOTE in case of failure of ice level sensor the P C Board turns on automatically the unit into the defrost cycle when the freezing cycle reaches 40 minutes At this point the unit initiates the defrost cycle The hot gas circulating into the evaporator serpentine causes a slight melting of ice cubes which get released from their molds Once entirely released the ice cubes drop simultaneously into the ice storage bin below by doing so they move apart from the evaporator bottom end the plastic deflector This plastic deflector has on its side a magnetic switch that on account of the deflector swinging motion caused by the ice while dropping in the bin opens and closes their contacts This will in turn disactivate the relay contacts that controls the hot gas and water drain valve which get deenergized allowing the unit to start a new freezing cycle When the ice bin is full of ice the last batch of ice cubes released from the evaporator accumulates to keep the bottom end of the plastic deflector in open position with the magnetic switch contacts open for longer than 30 the entire unit stops On model MV 50 in case one or both the ice slabs released from the evaporator are maintaining in open position their corresponding deflector for longer than 30 seconds with the consequent opening of the magnetic switch for the same extension of time the P C Board cause the stopping of the unit operation This normall2. Hot Gas Solenoid Valve The Hot Gas Solenoid Valve functions only during the Harvest Cycle to divert the hot discharge gas from the Compressor bypassing the Condenden ser and thermostatic expansion valve for direct flow to the Evaporator Platen Assembly to release ice cubes from the ice cube molds The Hot Gas Solenoid Valve is comprised of two parts the Body amp Plunger andthe Coilassembles Installed in the discharge line of the Compressor the energized solenoid coil lifts the valve stem within the valve body to cause the hot discarge gas to be diverted when the ice Thickness sensor has signalled to the P C Board to start the Harvest Cycle 7 Condenser temperature sensor The condenser temperature sensor probe located in contact with the condenser tube coil detects the condenser temperature variations and signals them by supplying current at low voltage to the P C BOARD In the air cooled versions in relation to the different current received the micro processor of the P C BOARD supplies through a TRIAC the power at high voltage to the fan motor so to cool the condenser and to reduce its temperature In case the condenser temperature rises and reaches 65 C 150 F the current arriving to the micro processor is such to cause an immediate and total stop of the machine operation with the blinking of the Red LED 8 High Pressure Control The high Pressure Control a safety control is factory set to cut out a
3. O CORD SET Accessoires KSC 25 Cube stacking kit Dimensions HEIGHT 680 mm 26 3 4 WIDTH 800 mm 31 1 2 DEPTH 600 mm 23 5 8 WEIGHT 100 Kgs MV 32 MACHINE SPECIFICATIONS oem lr Gm R Model Cond unit Finish Comp HP 11 24 HR MV 32 AS Air 470 MV 32 AS 9 0 49 1600 38 4 lt Cubes per harvest 289 Full 578 Half With water at 15 C Page 9 SPECIFICATIONS MODULAR CUBER MV 50 wn al Be iil rua T thu i PE J Ean Ke erz d 11 N Y m eee N N la L Be Du l d Di W iit l Kal S tz mi j EL pitt UU es Lt jt NA 4 TTT HE i EE THT IILL 7 KELLIL SIII Waha ice making capacity AIR COOLED MODELS WATER COOLED MODELS Kg C Kg 550 525 10 2 cc 2 Se I 500 D I 500 21 kay es lt E CN lt A lt x X oc cr Lu 450 UI OI 475 UI A D a D Q Q 32 O 400 d 450 D H D 38 Q Z Q Z 2 350 Z 4 LU m m SS S dr S O lt O lt 300 400 32 27 21 15 10 C WATER TEMPERATURE WATER TEMPERATURE NOTE To keep your Modular cuber performing at its maximum capacity it is necessary to perform periodic maintenance as outlined on page 29 of this manual Model MV 50 AS MV 50 WS Model MV 50 AS MV 50 WS F Page 10 SPECIFICATIONS CONT D amp 606 CG 20 mm WATER OUTLET 20 mm WATER OUTLET WATER COOLED ONL
4. Outlet Solenoid Valve functions in conjunction with the water pump to flush out the sump assembly at the beginning first 20 of every harvest cycle This action cleans up and rinses the sump during each harvest cycle pre venting dangerous water minerales concentration 12 Thermostatic Expansion Valve TXV 2 on model MV 50 The Thermostatic Expansion Valve regulates the flow of refrigerant to the evaporator and reduces pressure of liquid refrigerant from condensing pressure to evaporating pressure 13 Water pump The water pump primes the water from the sump to the water distributor tube s and through the distributing holes it cascades down onto the evaporator cells by gravity so to be frozen into clear ice cubes The water pump remains off during the first minute of the freezing cycle to avoid any cavitation problem while it s kept running during the first 20 of defrost harvest cycle to drain out purge the remaining water from the sump reach in mineral salts Page 24 REMOVAL AND REPLACEMENT PROCEDURES WARNING Disconnect electric power supply to icemaker whenever replacement procedure are performed WATER PUMP 1 Remove front panel 2 Remove the control box cover 3 Unplug pump from P C Board 4 Remove screws holding pump bracket to the right side of freezing compartment 5 Pull pump forward and lift up 6 Remove discharge hose from pump outlet Reverse to replace RESERVOIR 1 Close wa
5. in proper charge of R 404 A in liquid phase 6 on motor shaft and hub position To replace fan motor also remove it from bracket Reverse to reassemble NOTE When replacing a refrigeration component the exact refrigerant charge must be weighed or metered into a completely evacuated system because the MV is a critically charged system Page 26 MV 12 21 32 50 WIRING DIAGRAM 220 V 50 Hz 1 ph brown light blue yellow green white black red lt 0 m b g b n r O QOO CC Eat LINDA d Se 21013 Zo LL D C ion lt loto i i ln i o N i t i b rh ee 105 a W S E k D BL nim _ VERTILATON DISPLAY I 1 OOO AE COMPRESS SERINANENTO ER ERI GHIA CIE PONPA POD HIPDD MICRO SENSORE QG off a oo SCC em Aen t eh kee gt m n Air em zm rem mm px mm pm Ae 7X N A Input terminal board K Water pump B Compressor contactor L Water dischargue electrovalve C Compressor M Gas electrovalve D Ice sensor N Max pressure switch E End defrosting switch two on MV 50 O Max pressure switch signal F Led card P Condenser temperature probe G Electronic card Q Heating resistance of carter compr H Fan motor one on MV 12 and MV 50 where used Page 27 SERVICE DIAGNOSIS The table below is intended as a quick reference Reference to other portions of this manual to aid
6. is allowed directly into the evaporator The high pressure gas is cooled by the cold evaporator so it condenses into a liquid giving up its heat as it does so This heat warms the evaporator and the ice frozen onto the evaporator surface melts releasing the frozen cubes Ice then falls by gravity into the storage bin The liquid refrigerant goes through the suction line into the heat exchanger where it boils off so that only refrigerant vapor is drawn into the suction tube of the compressor WATER SYSTEM During the harvest cycle the electric water drain valve is energized thereby opening the drain line All water remained in the reservoir at the end of freezing cycle is pumped out to the waste through the water solenoid and drain line during the first 20 seconds ofthe defrost cycle eliminating any possible build up and accumulation of minerals concentration and impurities in the water reservoir As the pump stops the incoming water passing through the float valve has still sufficient time before the beginning of the next start up of the water pump to properly fill up the sump reservoir sothatthere would not be any cavitation problem when the water pump will resume its operation This grants a better ice formation inside the cooling cells When the released ice cubes drop into the bin they open up for a fraction of a seconds the bottom end of plastic deflector This deflector swinging motion is enough to reset the con
7. keep your Modular cuber performing at its maximum capacity it is necessary to perform periodic maintenance as outlined on page 29 of this manual Page 6 SPECIFICATIONS CONT D 600 800 530 20 mm WATER OUTLET 20 mm WATER OUTLET WATER COOLED ONLY 3 4 GAS WATER INLET 6 CORD SET Accessoires KSC 18 Cube stacking kit Dimensions HEIGHT 530 mm 20 7 8 WIDTH 800 mm 31 1 2 DEPTH 600 mm 25 3 8 WEIGHT 77 Kgs MV 21 MACHINE SPECIFICATIONS aa nn comme TRS Model Cond unit Finish Comp HP 11 24 HR MV 21 AS Air 380 MV 21 WS Water Stainless Steel 1 1 4 1800 MV 21 AS 6 30 1100 26 4 E 1 2 Cubes per harvest 204 Full 408 Half With water at 15 C Page 7 SPECIFICATIONS MODULAR CUBER MV 32 ice making capacity AIR COOLED MODELS WATER COOLED MODELS Kg 330 10 O L O LL CC LL E 300 21 gt E E lt N oc Cr oc Cr LI 270 LU Lu Lu A A o o O a O TT E 240 32 E D D Q Z Q Z E 210 Q LU an 38 a Lu Lu O lt O lt 180 32 27 21 15 10 C WATER TEMPERATURE WATER TEMPERATURE NOTE To keep your Modular cuber performing at its maximum capacity it is necessary to perform periodic maintenance as outlined on page 29 of this manual Page 8 SPECIFICATIONS CONT D 600 800 680 75 20 mm WATER OUTLET 20 mm WATER OUTLET WATER COOLED ONLY 3 4 GAS WATER INLET
8. remove condenser from unit re ar side Reverse to reassemble CONDENSER WATER COOLED 1 Shut off water 2 Remove front and left side panels 3 Store most of refrigerant charge in liquid receiver 4 Isolate parts to be opened from the rest of the system 5 Unsweat water and refrigerant lines 6 Unbolt and remove condenser Reverse to reassemble HOT GAS VALVE 1 Remove front right side panel and right fan motor shroud Unplug hot gas valve Purge system of refrigerant Cutorunsweat valve remove from machine To replace heat sinking the valve is CRITI CAL Wrap the replacement valve in wet rags and sweat into place Leave rags on until joints cool Reverse steps 3 1 to reassemble 01 5 O N WARNING Be sure the electrical power supply circuit breaker and the inlet water supply are OFF BEFORE starting any of the folloving REMOVAL AND REPLACE MENT procedures as a precaution to prevent possible personal injury or damage to eguipment REMOVAL AND REPLACEMENT OF THE DRIER To remove the drier 1 Remove front and left side panel 2 Remove screws and remove left side fan motor shroud 3 Store most ofthe refrigerant charge into liquid receiver 4 Unsolder refrigeration lines at both ends of the drier and remove the drier To replace the drier Page 25 WATER REGULATING VALVE WATER COOLED Shut off water Remove front and right side panel CAUTION If the factory s
9. K ON THE MV 32 KIT STACKING KCS 50 TO STACK 2 MV 50 s Page 15 START UP 1 START UP 1 If not yet done remove screws and pull the Front Panel out 2 Open the water supply line shut off valve NOTE Observe that the inlet water can be seen flowing into the Sump Assembly Allow water to fill the Sump about three minutes until the water is at level The float should cause the water flow to stop few mm from reservoir overflow When the float has been risen from the water filling the Sump Assy the water has forced all trapped air out of Water Pump and pump tube thus preventing the pumping of water filled with air bubbles 3 Putunitunder power by moving power line switch to ON position Immediately the fourth LED will glow and four five seconds later the third one too together with the compressor Check operation of the freezing cycle a Compressor is operating b Fan motor in air cooled version controlled by the condensing temperature sensor located in contact with the condenser copper tube c Water pump is operating as seen by water moving through the tygon tube up to the water distributor at the top of evaporator plate where water is uniformly distributed and cascades down over the egg crate evaporator back into the Sump for recirculation NOTE The Water pump will start up after a minute delay time controlled by the PC Board so to avoid any possibility to such air cavitation NOTE Do not remo
10. LS Besides the above drain a separate condenser drain must be run Connect it to the 3 4 gas condenser drain connection at the back of the cabinet STORAGE BIN A separate gravity type drain needs to be run similar to the air cooled sump drain Insulation of this drain line is recom mended FOR THE ELECTRICIAN ELECTRICAL CONNECTIONS The unit come equipped with an electrical cord for power supply The lead wires must be connected to an electrical plug that corresponds to the local electrical codes and requirements or to a separate two poles disconnect box with opening to the contacts of about 3 millimeters The disconnect box shoulds be placed close to the selected ice maker location to be easily and prompt reached Undersized wiring or unproperly installed electrical circuit will result in major problems and malfunctions Voltage variations shoud not exceedten percent IMPORTANT All plumbing and electrical connections must be made by licensed plumbers and electricians this one must follow the electrical specifications printed on the ice maker nameplate NOTE All SCOTSMAN Cubers require a neutral wire and a solid earth ground wire to prevent possible severe Electrical Shock Injury to individuals or extensive damage to equipments FINAL CHECK LIST 1 Is the cabinet bin level 2 Is the cuber in a location where ambient temperatures are a minimum of 10 C 50 de grees F all year around and to not exceed a
11. P C Board Located in the control box this board is the brain of the system as it governs the ice machine cyclematic through sensors relays and switch lt consists of two separated printed circuits one at high and the other at low voltage integrated with a fuse 4 A of four connectors for the sensors switches condenser sensor BLACK two magnetic switches BLUE ice thickness sensor RED of two jumpers one J1 for the selection between models MV 21 32 one magnetic switch and the model MV 50 two magnetic switches and the second J2 for the selection between manual or automatic reset mode of one outlet connector front LED display black and of five Page 22 MV SERIES CONSOLE PANE gau mapas o Str o Jan m i L B rai UH MV SERIES PC BOARD plug in terminals for input and output power With the two upper pins of the P C Board jumped the same is set up in automatic reset mode while when disconnected is in manual reset mode With the bottom ones jumped the P C Board is set up to operate with one magnetic switch MV 21 and MV 32 when disconnected is set up for two magnetic switches MV 50 The P C Board is eguipped by an electronic safety timer that turns on automatically the unit to defrost cycle when freezing cycle is longer then 40 minutes and trip off complete unit when defrost cycle is longer then 3 minutes Red LED ON Page 23 3 Compressor Contactor Located
12. SERVICE MANUAL MV 12 MV 21 MV 32 MV 50 R 404 A VERSION Electronic modular cubers SCOTSMAN TABLE OF CONTENTS Page 2 Table of contents 2 Specifications 3 4 5 6 7 8 9 10 FOR THE INSTALLER Introduction Storage bin Standard legs Important operating reauirements Select location Storage bin Ice machine Stacking instructions Final check list FOR THE PLUMBER Conform to all applicable codes Water inlet Drains For the electrician Electrical connections START UP Start up 15 16 OPERATION Refrigeration during freeze Water system ech GO IN Refrigeration system during harvest Water system Control sequence Ne B A O O O SERVICE SPECIFICATIONS Component 21 Operating characteristics 21 COMPONENT DESCRIPTION Component description 22 23 REMOVAL AND REPLACEMENT PROCEDURES 24 25 WIRING DIAGRAM MV 12 21 32 50 air water cooled 26 SERVICE DIAGNOSIS Service diagnosis 27 28 MAINTENANCE amp CLEANING INSTRUCTION Ilcemaker Ice storage bin Cabinet erxterior Cleaning lcemaker Page 3 SPECIFICATIONS MODULAR CUBER MV12 yan MPU Aa ice making capacity AIR COOLED MODELS WATER COOLED MODELS O Wa LU o ce oc gt S gt ii E E E 7 Se a a S S E S z S m T e A m A OO Lu S LU O lt O lt 32 27 21 15 10 C WATER TEMPERATURE WATER TEMPERATURE NOTE To keep your Modular cuber performing at its maximum ca
13. Y 3 4 GAS WATER INLET CORD SET WATER INLET WATER COOLED ONLY Accessoires KSC 50 Cube stacking kit Dimensions HEIGHT 745 mm 29 5 8 WIDTH 1078 mm 42 1 2 DEPTH 564 mm 22 1 4 WEIGHT 128 Kgs MV 50 MACHINE SPECIFICATIONS mamu lz comme Cond unit Finish Comp HP 1 04 HR Air 720 cn 60 220 s Cubes per harvest 578 Full 1156 Half With water at 15 C Page 11 FOR THE INSTALLER INTRODUCTION These instructions provide the specifications and the step by step procedures for the installation start up and operation for the SCOTSMAN Model MV 12 21 32 50 Modular Cubers The Models MV 12 21 32 50 Modular Cubers are quality designed engineering and constructed and are thoroughly tested icemaking systems providing the utmost in flexibility to fit the needs of a particular user L i VIII JA IN AA L 4 INSTALLATION NOTE Allow 15 cm minimum space at sides and back for ventilation and utility connections STORAGE BIN The MV 12 stack on top of Scotsman bin model B 190 the MV 21 32 stack onto SCOTSMAN bin model B 390 while the model MV 50 onto bin B 550 Refrigerant R 404 A Charge per nameplate rating STANDARD LEGS Furnished with storage bin Four legs screw into mounting sockets on cabinet base Provide 16 cm 6 minimum height including adjustable leveling foot Optional Kit Casters for B 190 390 KRB 390 and for B 550 KRB 550 are available on requ
14. achine and of the bottom machine so to avoid any possible leak of water through the clearence in between FOR THE PLUMBER CONFORM TO ALL APPLICABLE CODES WATER INLET AIR COOLED MODELS The recommended water supply is cold water 3 8 O D copper tubing connected a 3 4 gas male fitting at the back of the cabinet Install a hand valve near the machine to control the water supply Switch Plug receptacle Electrical plug Water inlet Shut off valve Water filter Water outlet line Bin water outlet line Open vented water drain Water outlet from the condenser water cooled version only 32231 es i When choosing the water supply for the MV Cuber consideration should be given to A Length of run B Water clarity and purity C Adeguate water supply pressures Since water is the mostimportant single ingredient In producing ice you cannot over emphasize the three items listed above Low water pressure below 1 bar may cause malfunction of the icemaker unit Water containing excessive minerals will tend to produce cloudy colored ice cubes plus scale build up on parts in the water system Heavily chlorinated water can be controlled using charcoal or carbon filters DRAINS AIR COOLED MODELS There is one 20 mm dia sump drain fitting at the back of the cabinet Insulations in high humidity areas is recom mended The ideal drain receptacle would be a trapped and vented floor drain WATER COOLED MODE
15. cooled If air cooled the discharge pressure will change with the heat load and the ambient air temperature If water cooled the discharge pressure is controlled by the amount of water flowing through the condenser which is determined by the water regulating valve After the gas is cooled in the condenser giving up much of its heat the gas condenses into a high pressure liquid This liquid travels through the liquid line to the metering device a thermostatic expansion valve on models MV 12 21 32 and two thermostatic expansion valves on model MV 50 The thermostatic expansion valve meters how much liquid refrigerant is to be allowed into the evaporator section of the refrigeration system This is determined by the temperature of the TXV sensing bulb located on the suction line manifold at the outlet of the evaporator If the bulb senses a warm suction line more refrigerantis allowed into the evaporator common at the beginning of the freeze cycle and when the temperature begins to fall less refrigerantis allowed through This is why the suction side gauge pressure will decline throughout the freeze cycle At the evaporator the liquid refrigerant released from high pressure boils off in the low pressure environment and absorbs heat thus cooling the evaporator surface and anything near it such as water The low pressure refrigerant vapor then is forced through the heat exchanger where any excess liquid refrigerant boi
16. eal is broken on the replacement drier exposing it to the atmosphere more than a few minutes the 1 drier will absorb moisture from the 2 atmosphere and lose substantial ability for moisture removal Unscrew water inlet fitting connection at the water regulator valve to condenser bracket 4 Purge system of refrigerant 1 Remove the factory seals from the 5 Unscrew fitting connection at outlet of valve replacement drier and install the drier in the 6 Unsweat valve connection from T joint on refrigerant lines with the arrow positioned in the direction of the refrigerant flow Solder the drier into the lines two places taking precautions to NOT OVERHEAT the drier body during installation soldering system liquid line Remove valve from machine Reverse to reassemble THERMOSTATIC EXPANSION VALVE 3 Purge the system and check for leaks i 4 Throughly evacuate the system to remove 1 Remove front and top and right side panels moisture and non condensables 2 Purge system of refrigerant 5 Charge the system with refrigerant by weight 3 Unsweat valve at inlet equalizer and outlet SEE NAMEPLATE 4 Remove insulation from valve bulb remove 6 Replace and attach front and left side panel mouting straps and valve trom cabinet NOTE Always install a replacement drier anytime the sealed refrigeration system is opened Do not replace the drier until all other repair or replacement has been co
17. est IMPORTANT OPERATING REQUIREMENTS MINIMUM MAXIMUM Air Temperature 10 C 50 F 40 C 100 F Water Temperature 5 C 40 F 35 C 90 F Water Pressures 1 bar gauge 5 bar gauge Electrical Voltage Variations Voltage rating specified on nameplate 10 10 Extended periods of operation exceeding these limitations constitues misuse under the terms of Manufacturer s Limited Warranty resulting in a loss of warranty coverage SELECT LOCATION The first step in installing the equipment is to select the location The purchaser of the unit will have a desired spot in mind check out that spot to insure that it is indoors inan environment that does not exceed the air and water temperature limitations for the eguipment thatthe necessary utilities are available including the correct voltage electrical power thatthere be space around the installed machine for service 15cm minimum left right and rear for air cooled models STORAGE BIN The SCOTSMAN bins for these units are the B 190 B 390 and B 550 Other bins may be available with bin tops to vary the storage capacity Lay the bin on its back using cardboard from the carton to support it screw in the legs Stand the bin upright and correct any possible small tears in the machine mounting gasket with food grade silicone sealant ICE MACHINE The use of a mechanical lift is recommended for lifting the uncrated icemaker onto the bin Remove front top and s
18. he following is a list of recommended maintenance that will help keep your machine running with a minimum of problems Maintenance and Cleaning should be scheduled at a MINIMUM of twice per year while sanitation once per month ICEMAKER THE FOLLOWING MAINTENANCE SHOULD BE SCHEDULED AT LEAST TWO TIMES PER YEAR ON THIS ICEMAKER CALL YOUR AUTHORIZED SCOTSMAN SERVICE AGENCY 1 Check and clean or service any optional water treatment devices if any installed 2 Clean water strainer 3 Check that the cabinet is level in the side to side and front to back directions 4 Clean Sanitise the water system evaporator plate and sump assembly using a solution ot Ice Machine Cleaner Sanitiser Refer to CLEANING Icemaker NOTE Cleaning Sanitising requirements vary according to local water conditions and individual user operation Continuous check of the clarity of ice cubes and visual inspection of the water system parts evaporator plates and the sump assembly before and after cleaning will indi cate frequency and procedure to be followed in local areas 5 Check and tighten all bolts and screws 6 Checkforwater leaks and make corrections 7 Check the bin control to test shut off Holding the evaporator deflector in open Position for more that 30 shold cause the ice maker to shut off Once the evaporator deflector is released in its closed position the ice maker will restart 8 Check cube size adjust if requi
19. ides panels Place the unit directly onto the bin align it with the back of the bin Locate the hardware package take out two mounting screws and use them to secure the Icemaker to the two sides of the bin See illustration below Remove all shipping material as well as the masking tapes from the ice deflector evaporator cover Page 12 Remove first the ice deflector evaporator cover then the masking tape from the ice thickness sensor MV 12 AIR SEPARATOR Install on the rear right side of the machine the air separator as per instruction provided with it STACKING INSTALLATION To stack a second MV onto the present one first remove the top panel from the lower machine Add a bead of food grade silicone sealant to the top edges of the lower units freezing compart ment Lift the top machine onto the bottom Page 13 machine the use of a mechanical lift is recommended for this step Align the two machines cabinets and using the 2 screw from the top units hardware package fasten the two units together atthe side cabinets Then make use of the Stacking Kit KSC 12 KSC 21 KSC 32 or KSC 50 to be mounted as per fitting instructions included in their package respectively on MV 12 MV 21 on MV 32 and MV 50 located inthe bottom for proper conveying of the ice cubes made by the top unit into the storage bin With food grade silicone perfectly seal the edge between the freezing compartment of the upper m
20. in the control box the compressor contactor functions to carry the compressor line current The contactor is wired to receive power from the P C Board 4 Ice Thickness Sensor Located in the front upper right side off the evaporator the sensor is made with two metal reeds in which passes power at low voltage The two metal reeds which are individually insulated are set through a setting screw to maintain a minimum clearence from the evaporator 5 7 m m Once ice is formed into each mold and is thick enough to fill up that minimum clearance existing between the two sensor reeds and the evaporator the water that cascades over the ice has gradually approached to make contact between the two sensor reeds It is enough that this contact remains there for about 10 seconds that the P C Board receives the signals to put the ice machine on defrost 5 Magnetic Switch Located in the front of the evaporator front plastic deflector one for each one on model MV 50 this switch sends a pulse to the P C Board which switches the machine back in the freezing cycle On model MV 50 after the pulse sent by the second magnetic switch signalling the dropping into the bin of the second slab of ice the P C Board restarts a new freezing cycle NOTE In case the P C Board does not receive the pulse from the second microswitch after 40 second from the first pulse it will switch in any case the unit from defrost to freezing cycle 6
21. ll keep the machine in Cleaning mode for 30 minutes In case too long the cleaning mode can be stopped by pushing again the RESET BUTTON D After 20 minutes push the RESET BUTTON for a while The P C Board put the machine in automatic rinsing mode with the special blinking blink twice and repeat of the Yellow LED Page 30 7 Pushing the RESET BUTTON for 6 8 NOTE RINSING mode consists of seconds the machine restarts in the freezing a energize the water drain valve and the cycle water pump for 30 seconds to empty the melaa S e 8 Replace the evaporator cover deflector and b deenergize the water drain valve and the front panel Wa 100 ae 9 Check the next batch of cubes to be sure all c energize the water pump for 3 minutes the cleaner is gone no sour taste The above sequence is repeted 7 times so to be sure to have removed any possible trace of Ice Machine Cleaner CAUTION DO NOT use ice cubes produced from the cleaning solution Be sure none remains in the bin 6 Atthe end of the 7th Rinsing cycle the P C Board stops the operation of the machine with the blinking slow of the Yellow LED cubes and to also clean the bin drain 10 Pour hot water into the storage bin melt the B190 B390 B550 BIN B LEFT SIDE VIEW K L 110 1005 430 65 65 560 110 110 110 1010 100 100 620 o 80 980 877 97 97 582 96 96 DIMENSIONS ARE IN MILLIMETERS
22. ls off allowing only refrigerant vapor to enter the compressor suction tube where it is recompressed into high pressure high temperature gas again and the cycle repeats Page 18 FREEZE CYCLE WATER SYSTEM A mechanical float valve is used to control the level of the water into the reservoir sump A pump running continuously after the first minute of freezing cycle forces the water to the top of the evaporators where it is distributed through a water tube and then cascades down EVAPORATOR WATER DRAIN VALVE WATER OUTLET gt WATER INLET gt s the evaporator surface by gravity As it flows accross the refrigerated evaporator some of the water will be chilled enough to change form turn to ice and stay frozen onto the evaporator cells Most of the water returns to the reservoir to be sucked back into the pump and repumped over the evaporator WATER DISTRIBUTOR TUBE DEFLECTOR PUMP RESERVOIR 4 ICE STORAGE BIN Page 19 HARVEST DEFROST CYCLE EVAPORATOR COMPRESSOR if HEAT ai EXCHANGER CONDENSER LIQUID RECEIVER PRESSURE SWITCH FAN CONTROL REFRIGERATION SYSTEM SCHEMATIC REFRIGERATION SYSTEM DURING HARVEST The refrigeration system performs the harvest of ice by use of a hot gas bypass valve When the time comes to de ice the evaporators the hot gas valve is energized and the high temperatu re high pressure gas bypasses the condenser and
23. maximum of 40 C 100 F 3 Is there at least a 15 cm clearance behind and around the cabinet for all connections and for proper air circulation 4 Have all electrical and piping connections been made 5 Has the electrical power supply wiring been properly connected and the voltage tested and checked against the nameplate rating Has the unit properly grounded 6 Isthe water supply line shutoff valve installed and opened and has the inlet water supply pressure been checked to insure a minimum of 1 bar without exceeding a maximum of 5 bar Page 14 7 Have the compressor holddown bolts been checked to be sure the compressor is snug on the mounting pads 8 Check all refrigerant lines and conduit lines to gard against vibration and possible failure 9 Has the cuber and the bin been wiped clean with clean damp cloths 10 Has the owner user been given the User Manual and instructed on how to operate the icemaker and the importance of periodic maintenance 11 Has the owner user been given the name and telephone number of the Authorized SCOTSMAN Distributor or Service Agency serving him 12 Has the Manufacturer s Registration Card been properly filled out Check for correct Model and Serial Numbers from nameplate then mail the completed card to the Manufactured TYPICAL STACKING INSTALLATION KIT STACKING KCS 12 TO STACK 2 MV 12 s KIT STACKING KCS 21 TO STACK ON THE MV 21 KIT STACKING KCS 32 TO STAC
24. mpleted REMOVAL AND REPLACEMENT OF THE EVAPORATOR PLATE ASSEMBLY 1 2 Remove front and top panels Store refrigerant charge in liquid receiver and isolate parts to be opened from the rest of the systems Disconnect water distributor tube above the evaporator plate and remove it 5 Place new valve bulb in same place as old valve secure with straps and reinsulate Reverse to reassemble NOTE Always install a replacement drier anytime the sealed refrigeration system is opened Do not replace the drier until all other repair or replacement has been completed Throughly evacuate the system to remove moisture and non condensables FAN MOTOR OR BLADE LEFT AND RIGHT SIDE 1 2 3 4 Remove top and left or right side service panels Remove screws and fan motor shroud Unplug fan motor to be removed 4 Unsnap and remove evaporator cover Remove fan motor bracket from upper tie rod deflector of unit chassis 5 Unloose and remove all screws securing the 5 Remove fan blade from motor Note location evaporator frame to the chassis Unsolder and remove the refrigerant lines at the top of the evaporator plate to be replaced Remove nuts at top and left and right side of the evaporator to remove top and side trimming that make the frame of the evaporator plate The evaporator plate is now free To replace the evaporator plate reverse the removal procedures See nameplate Weight
25. pacity it is necessary to perform periodic maintenance as outlined on page 29 of this manual Page 4 SPECIFICATIONS CONT D H m S SS SS gt SC Cl SS lt Se ml o Va men RSS E E J NR E E SS E SNS E A SS en Ka LI LN S SES 3 4 GAS ken v m i A 58 mm 2 2 7 108 mm 4 1 4 161 5 mm 6 1 3 3 4 GAS 225 5 mm 87 8 3 4 GAS 471 5 mm 18 4 7 20 mm 25 32 D 20 mm WATER OUTLET 20 mm WATER OUTLET WATER COOLED ONLY 3 3 4 GAS WATER INLET CORD SET Accessoires KSC 12 Cube stacking kit Dimensions HEIGHT 530 mm 20 6 7 WIDTH 560 mm 22 DEPTH 600 mm 23 5 8 WEIGHT 52 Kgs MV 12 MACHINE SPECIFICATIONS MV 12 AS Air 190 MV 12 AS N 4 0 20 750 18 5 Cubes per harvest 132 Full With water at 15 C Page 5 SPECIFICATIONS MODULAR CUBER MV 21 E d d Z d e S 4 7064 Ce FETT T SZ Ee C D S Fer d GE Ge L Laad e i Jr d GA D d d E ice making capacity AIR COOLED MODELS WATER COOLED MODELS Kg C 220 N LU g 10 a or fr n E I I 200 x lt N Ee or D ui D e S a S a a O 5 160 L 3 H A Q Z S 8 1 i n o z ONE O lt O lt 120 32 27 21 15 10 C WATER TEMPERATURE WATER TEMPERATURE NOTE To
26. red through setting screw of ice thickness control sensor 9 With unit out of operation clean the condenser using vacuum cleaner wisk broom or brush Instruct customer to clean condenser frequently DO NOT USE A WIRE BRUSH ICE STORAGE BIN The interior liner of the bin is in contact with a food product ice and should be cleaned and sanitised regularly Once a week sanitise it with a commercial food grade sanitiser compling with the manufacturer dilution CABINET EXTERIOR Wipe clean unit and bin cabinet exterior with a clean cloth or disposable paper wipers soaked in warm water with mild detergent solution CLEANING Ice maker WARNING Ice Machine Cleaner contains Phosphoric and Hydroxyacetic acids These compounds are corrosive and may cause burns If swallowed DO NOT indu ce vomiting Give large amounts of water or milk Call physician immediately In case of sxternal contact flush with water KEEP OUT OF THE REACH OF CHILDREN 1 Empty bin of ice 2 Remove front panel 3 Wait till the end of the defrost harvest cycle then push the RESET BUTTON for 6 8 seconds The machine should stop with the blinking of the Yellow LED slow blink 4 Pour100ccon MV 12 200 cc on MV 21 32 and 400 cc on MV 50 of Scotsman Ice Machine Cleaner directly into the reservoir then push again the RESET BUTTON for a while The water pump starts to operate with the fast blinking of the Yellow LED NOTE The P C Board wi
27. t 28 bar and cut in at 22 bar The control functions as a precautionary device to shut OFF electrical power to Icemaker should a loss of water occur to the water cooled Condenser or a burnt out of one of both the fan motors on air cooled versions The high Pressure Control is manual reset with reset button located on the rear side of the machine and a monitoring light on the Front Console Panel 9 Water Regulator Valve Water Cooled Models The Water Regulator Valve functions maintain a constant Compressor head pressure by regulating the amount of incoming water flow through the Condenser on water cooled models The valve operate through the refrigerant system high side pressure Rotating the adjusting screw located on top of the valve can INCREASE or DECREASE the water flow through the water cooled Condenser which in turn will DECREASE or INREASE the Compressor operating head pressure 10 Water Distribution System The Water Distribution System function to eventy supply water to all cells of the evaporator plate The water pump pumps water from the sump to the tee From there water is channeled through the vertical tygon tube to the water distributors above the evaporator plate and from the holes in the distributor tube water flows to the cells on one side of the evaporator plate Gravity flow returns the unfrozen excess portion of water to the sump reservoir for recirculation 11 Water Drain Solenoid Valve The Water
28. tact of the magnetic switch which via electronic control board deenergizes the water drain valve allowing the unit to initiate a new freezing cycle On model MV 50 the release of the ice plate from the second evaporator will cause the restart of the machine in the freezing cycle NOTE In case the P C Board does not receive the pulse from the second magnetic switch after 40 second from the first pulse it will switch the unit from defrost to freezing cycle The harvest cycle lasts about 1 5 2 minutes CONTROL SEQUENCE At the start of the freezing cycle the contacts of the magnetic switch mechanically operated by the actuator plate of the deflector cover are closed thereby via electronic control board closing the circuit to the main contactor coil and consequently to the compressor and fan motors and to the water pump motors Then as the ice thickness reaches the value that corresponds to the full cube size the film of water that constantly cascades over the slab of ice formed on the evaporator arrives to establish a contact between the two fingers energised at low voltage of the ice sensor control located on the front upper right side of the evaporator If the contact between the two fingers of the ice sensor remains established by the film of water for more than 10 seconds a small relay of the electronic board get energized controlling simultaneously both the hot gas valve and the water drain valve
29. ter valve on water supply line 2 Remove front panel 3 Remove evaporator front cover 4 Remove reservoir drain plug and flush reservoir out 5 Remove screws securing reservoir 6 Lift up and pull forward to remove reservoir Reverse to replace DISTRIBUTOR WATER TUBE 1 Remove front panel 2 Remove evaporator front cover 3 Locate water distributor at the top of the evaporator 4 Pull distributor forward to unsnap it from its holdind clamps 5 Remove hose clamp and water hose Reverse to replace OUTLET WATER VALVE 1 Remove front and right side panel Remove fan motor shroud Unplug water valve Remove clamp securing outlet tube to valve Remove hose clamp and hose from inlet fitting 6 Remove two screws and nuts securing valve to its metal bracket and remove valve Reverse to replace 01 5 O N COMPRESSOR 1 Remove top panel if possible front panel an J service panel and left fan motor shroud 2 Store refrigerant charge in liguid receiver 3 Disconnect electrical lines from compressor 4 Isolate parts to be opened from rest of the system 5 Remove compressor mounting bolts Reverse to reassemble CONDENSER AIR COOLED 1 Removeboth side panels and remove screws of condenser bracket 2 Store most of refrigerant charge in liguid receiver 3 Isolate parts to be opened from the rest of the system 4 Cut or unsweat liquid and discharge lines 5 Unbolt and
30. the Service Agent in determining the cause Inclusing wiring diagrams installation and of a particular type of malfunction as well as the operation are recommended to better determine recommended repair It is not intended to be can the cause of a problem exclusive list Machine does not run Defrost or harvest cycle too long Check for hot gas valve failure for Warning Red LED ON more then 3 malfunction of water pump for shortage of water for malfaction of magnetic switch for proper operation of compressor contactor and for compressor operation Warning Red LED BLINKS Too high condensing temperature Check for correct operation of fan motor s and condenser sensor Warning Red LIGHT ON Too high condensing pressure Check for correct operation of fan motor s No warning LED LIGHT ON P C Board inoperative Remove board and check No power to unit Check electrical source Bin full Yellow LED ON Bin Full of ice Nome Magnetic switch inoperative Check and replace Machine runs compressor P C Board compressor Test and replace does not relay open Compressor contactor open Test and replace Compressor relay open Test and replace Compressor winding open Test and replace Machine runs makes ice Ice thickness control open Check sensor fingers does not try to harvest if are not covered with scale sediment Too soft water Water electrical conductivity must be higher then 20
31. till decline as the machine freezes ice Disch pressure freeze max 16 bar 17 bar 15 5 bar 17 bar 16 5 bar 17 bar 17 5 bar 17 bar Disch pressure freeze min 14 bar 17 bar 13 5 bar 17 bar 14 5 bar 17 bar 15 5 bar 17 bar Refrigerant charge R 404 A Model MV1 MV21 MV32 MV50 Air cooled 700 gr 1200gr 1700gr 2000 gr Water cooled 650gr 650gr 700gr 1200gr Refrigerant metering device Thermostatic expansion valve 2 on MV 50 Hi press Cut Out Safety Suction pressure Beginning freeze Suction pressure End freeze Freezing time Amp compr Beginning freeze Amp compr End freeze NOTE Always check nameplate on individual icemachine for special refrigerant charge before charging the refrigeration system Such refrigerant charge is the average charge for the MV Modular Cubers However it is important to check nameplate for each machine COMPONENT DESCRIPTION 1 Front Console Panel Equipped with four LED plus a warning light that when glow or blink are monitoring LED N 1 RED GLOW Machine off Too long defrost cycle BLINK Too high condensing temperature To restart the machine press the reset button LED N 2 GREEN GLOW Bin is full of ice BLINK Cleaning mode LED N 3 GREEN GLOW Compressor is under power BLINK 3 delay waiting time LED N 4 GREEN Power ON RED LIGHT Too high condensing pressure WATER ORAIN VALVES 2
32. ts longer then 40 NOTE To assure a correct operation of the machine the water must have a minimum electrical conductivity of 20 us 9 Check operation of magnetic switch controlling it by keeping open the bottom end of plastic deflector for more than 30 seconds The machine must switch off at storage bin full Release the plastic deflector The machine should restart in the freezing cycle mode within few Page 16 seconds going through a 3 delay time green LED blinking 10 Place again all cabinet panels and screws previously removed 11 Thoroughly explain to owner user the significant specifications of the ice maker start up reset and operation going through the procedures in the operating instructions Answer all questions about the ice maker by the owner and inform the owner himseft of the name and telephone number of the authorized service agency serving him Page 17 OPERATION FREEZE CYCLE HEAT EXCHANGER THERMOSTATIC EXP VALVE HOT GAS VALVE COMPRESSOR CLOSED LIQUID CONDENSER al RECEIVER PRESSURE SWITCH FAN CONTROL REFRIGERATION SYSTEM SCHEMATIC REFRIGERATION DURING FREEZE This ice machine employes either air or water as acondensing media the refrigeration system for either one is a follows At the hermetic compressor Refrigerant is compressed into a high temperature high pressure gas The gas moves through the discharge line into the condenser air or water
33. uS Machine can t run with demineralized water Built in relay on Check and replace P C Board PE C Board open Check system for correct refr charge Check for leak weight in charge Machine runs makes and harvests ice but very slowly Low refrigerant charge Page 28 SERVICE DIAGNOSIS SYMPTOM Low ice capacity Machine makes irregular ice High discharge pressure due to not condensable or overcharge Inefficient compressor Condenser dirty Low water flow Water cooled High air temperature air cooled Low water supply Plugged water distributor TXV supertheat wrong Refrigerant charge low POSSIBLE CAUSE CORRECTION Evacuate and weigh in charge Replace Clean Check and repair Check temperature of air entering condenser Check Float valve not mantaining proper water level in reservoir Clean water distributor Adjust or replace Adjust check for leak recharge Page 29 MAINTENANCE amp CLEANING amp SANITATION INSTRUCTIONS A SCOTSMAN Ice System represent a sizable investment of time and money in any company s business In order to receive the best return for that investment in MUST receive periodic maintenance It is the USER S RESPONSIBILITY to see that 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 T
34. ve the evaporator deflector cover as it will cause the switching off of the machine at STORAGE BIN FULL 4 First freezing time will range between 19 and 22 minutes Longer time for temperature above 25 C and shorter time required when temperature are below 25 C Average complete cycle time is about 22 min 5 Make sure of correct operation of float valve and water pump 6 Check for any irregular noise source and if any eliminate it 7 Observe first ice cube harvest and check size of ice cubes if an adjustment is required thread down or out screw N 1 as shown on below illustration This screw position determines the distance between the sensor reeds and the egg crate evaporator thus keeping the ice cube at a proper thickness NOTE This type of machine produce an ICE PLATE that breaks when falls down into the storage bin Setting the ice thickness sensor in order to have single ice cubes may cause malfunction of the machine 8 Observe second and third cube harvest Check if size and shape combination is correct In areas where extreme problem water conditions exist filtering or purifyng equipment is recommended NOTE If water used is too soft demineralized the ice thickness sensor might not be able to sense the water on its reeds there by it will not switch the unit on harvest cycle A safety system built in the P C Board switches the unit on harvest cycle whenever the freezing period ge
35. y occures in the full ice storage bin situation which are signalled by the simoultaneous glowing of the corresponding LED The machine will restart when the ice deflector will be back in its normal vertical position both for model MV50 provided that 3 are elapsed from unit stop If not the machine will delay its restart till 3 are elapsed with the blinking of the green LED Page 21 SERVICE SPECIFICATION In servicing a machine it is often useful to compare that individual units operating characteristics to those of a normally operating machine The data that follows gives those characteristics however be aware that these values are for NEW CLEAN machine operating at 21 C ambient and 15 C water USE THESE NUMBERS AS A GUIDELINE ONLY COMPONENT Reservoir level szc 30 35 mm Cube Size Control Ice Sensor distance from ENEE eege 27 7 mm High Pressure Safety Switch C IN 20 bar C OUT 28 bar OPERATING CHARACTERISTICS On air cooled models during the freezing cycle the discharge pressure is maintained between two preset values by means of fan control condenser sensor and at the same time the suction pressure will also decline reaching it s lowest point just before harvest Compressor amps experience a similar drop On water cooled the discharge pressure is constantly maintained during the freeze cycle by the water regulating valve However suction pressure and compressor amps will s
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