Home

AC 105 - Ice Systems

image

Contents

1. STAND BY The unit remain under electrical power but OUT of operation It canbe used by the service engineer in order to stop the unit during the service and inspection operations IN OPERATION The unit is running through the freezing and defrost cycles stopping automatically only at full bin situation RE SET HI TEMPERATURE To be selected to resume the unit operation when the ice maker shuts off due to the intervention of the condenser temperature sensor too high condensing tem perature or evaporator temperature sensor too high after 15 minutes from the beginning of the freezing cycle The five LEDS placed in a row in the front of the P C BOARD monitor the following situations GREEN LIGHT Unit under electrical power YELLOW LIGHT Unit shut off at full storage bin Se NN RED LIGHT Unit shut off due to hi condensing temperature RED LIGHT BLINKING Unit shut off due to hi evaporating temperature t YELLOW LIGHT Unit in freezing cycle mode lt YELLOW LIGHT Unit in cleaning rinsing mode not appearing in the front panel By means of one small jumper located on the back side of the P C Board can be modified the cut OUT condensing temperature safety temperature from 70 C 160 F for air cooled versions to 62 145 F for water cooled versions E DIP SWITCH The P C BOARD which controls the entire operation of the ice maker
2. has a DIP SWITCH with ten switching keys which allow to set up the micro processor program in order to extend or to shorten the length of freezing cycle in relation to the different model and versions of ice machines The DIP SWITCH first four keys setting determines the length of the 2nd phase of Page 19 freezing cycle controlled by the electronic timer as detailed in the table B TAB B 1 2 3 4 ON 7 1 OFF m em TN ON 2 OF mm m 20 TiN 3 on a mm 2 Tin el s 5 N See a ON 6 OF mmm mum om 15 min 7 of a 13 min LENGTH OF TIMED PORTION OF FREEZING CYCLE ACCORDING TO THE DIP SWITCH SETTING COMBINATIONS 1 2 3 4 e A m ain oe a E Omi 10 OO u a hn 1 o m e O E Sm 2 2 oe ee G 13 oN seers arom A in The DIP SWITCH keys 5 amp 6 setting determines the length of the defrost cycle according to the size of the cubes Large or Medium It is not possible to modify the length of the defrost cycle factory setting The 7th D S key is not used in this release of the P C BOARD The 8th DIP SWITCH key allows to make a rapid check up of the P C BOARD output connections compressor water pump fan motor water inlet and hot gas solenoid valves energizing them in rapid sequence 2 seconds one by one DURING THE AUTOMATIC OPERATION OF THE ICE MAKER THIS KEY MUST BE SET IN OFF POSITION ATTENTION The check up of the P C BOARD output must be perform
3. Te S VA eo 2 e WATERIN VALVE A O Q 3 coos O n CZ O D ois HOT GAS VALVE fa ao e O heel CONTACTOR COIL Rx Tx OSs O as 2 ey OF hell FAN MOTOR TOF D WATER PUMP Lu a a O oO ELECTRONIC CARD E Check to see through the ice discharge interior of the inverted mold cups also make sure opening that the spray system is correctly seated thatthe plastic curtain is hanging ake and there and that the water jets uniformely reach the is not excessive water spilling through it BIN TEMPERATURE SENSORS co O wn 7p uw oc oa Q oO WATER DRAIN VALVE O Q WATER IN VALVE ELECTRONIC CARD Page 10 F Theice making process takes place thereby with the water sprayed into the molds that gets gradually refrigerated by the heat exchange with the refrigerant flowing into the evaporator serpentine During the freezing process when the evaporator temperature falls below an established value the evaporator temperature sensor supplies alow voltage power signal to the electronic control device P C BOARD in order to activate an electronic timer This one takes over the control of the freezing cycle up to the complete formation of the ice cubes Fig 4 NOTE The lenght of the entire freezing cycle is governed by the evaporator temperature sensor which has its probe placed in contact with the evaporator serpentine Non adjustable incombination with the electronic timer Adjustable incorporated i
4. air cooled version TAB A A DIP SWITCH FACTORY SETTING COMBINATIONS PER MODEL AND VERSION Peale hace Pee oo ria KWD DIP SWITCH 10 ACM 105A amp W ON OFF OFF OFF ACL 105A amp W OFF OFF OFF ON ON ON ON OFF OFF ON OFF Page 13 EIG D Page 14 and between 9 5 and 10 5 bar 135 150 psig in the water cooled version being controlled by the temperature sensor probe located within the condenser fins air cooled version or on the condenser tube coil water cooled version On the air cooled version the condenser tempe rature sensor when senses a rising of the condenser temperature beyond the pre fixed limit changes its electrical resistance and transmits a low voltage power flow to the Micro Processor of P C BOARD which in turn energizes through a TRIAC the FAN MOTOR When the opposite situation occures i e the condenser temperature gets below the pre fixed limit the temperature sensor changes again its electrical resistance reducing therefore the current flow to the P C BOARD to cause the fan motor temporary cut off NOTE In case the condenser temperature probe senses that the condenser temperatu re has rised to 70 C 160 F on air cooled versions or 62 C 145 F on water cooled versions for one of the following reasons CLOGGED CONDENSER Air cooled version INSUFFICIENT FLOW OF COOLING WATER Water cool
5. at the supply to the building If low contact the power company Clean or replace Purge the system Check for loose wires in starting device Replace compressor Cubes too small Freezing cycle too short Capillary tube partially restricted Moisture in the system Shortage of water Shortage of refrigerant Inoperative evaporator sensor Review setting of DIP SWITCH keys Blow charge add new gas amp drier after evacuating systemwithvacuum pump Same as above See remedies for shortage of water Check for leaks amp recharge Replace sensor Cloudy cubes Shortage of water Dirty water supply Accumulated impurities See remedies for shortage of water Use water softner or water filter Use SCOTSMAN Ice Machine cleaner Page 24 SERVICE DIAGNOSIS SYMPTON POSSIBLE CAUSE SUGGESTED CORRECTION Shortage of water Water spilling out through curtain Water solenoid valve not opening Water leak in sump area Water flow control plugged Leak of water drain valve Check or replace curtain Replace valve Locate and repair Replace water inlet valve Replace valve Irregular cubes size amp some cloudy Some jets plugged Shortage of water Unit not level Remove jet cover and clean See shortage of water Level as required Cubes too large Freezing cycle too long Review setting of DIP SWITCH keys Decreased ice capacity Inefficient compressor Leaky wa
6. completion NOTE The change of the electric potential of the evaporator sensor with the consequent activation ofthe timer Time mode is signalled by the glowing up of the RED LED located in the front of the P C BOARD ATTENTION In case after 15 minutes from the beginning of the freezing cycle the temperature of the evaporator sensor probe is higher then 0 C 32 F shortage of refrigerant inoperative hot gas valve etc the P C BOARD switch OFF immediately the unit with the simultaneous blinking of the WARNING RED LED The length of this second portion of the freezing cycle is pre fixed and related to the setting of the first four DIP SWITCH keys The DIP SWITCH keys setting is made in consideration of the type of condenser used In Table B are indicated the various lengths of the second portion of freezing cycle Time mode in relation to the different combinations of the DIP SWITCH KEYS In Table A herebelow are illustrated the DIP SWITCH keys combinations for the three different models and versions as they are set in the factory The electrical components in operation during the freezing cycle are COMPRESSOR FAN MOTOR in air cooled version WATER PUMP CONTACTOR COIL and during the second phase of freezing cycle Time mode they are joined by the ELECTRONIC TIMER The refrigerant head pressure in the course of the freezing cycle ranges between 8 5 and 9 5 bars 110 130 psig in the
7. diagram for a reference BEGINNING FREEZE Electrical components Loads ON OFF COMPIeSSOL eececcesceseeeteeeereeetereeees bd Fan Motor Air cooled only and TRIAC kg Hot Gas Valve c ccccccccsseesscsseessesseeeeees e Water Inlet Valve cccccccsecseesecteeeeees e Water Drain Valve ccccccscesesseeseeneees bd P C Board Relay 1 Coil ceeeee y P C Board Relay 2 amp 3 Coil 00 e Water P MP ascitis iutan na ee Contactor Coils ines e PCB TIMEN n s Elctronic Controls amp Sensors ON OFF Evaporator Sensor ecceceeeereeeeeees Condenser Sensor cecerereeeeees e Ice Level Control cccccceeeseseseseeeees TIMED FREEZE Electrical components Loads ON COMPIESSOM ceeeeeeeceeeeeeeeeeeneeeeeeeneeeeas Fan Motor Air cooled only and TRIAC X Hot Gas Valve eeeceececeeeeeseeeessteeeseeees Water Inlet Valve ccceeeeeeeeeteeeees Water Drain Valve cceeeeeeeeeees P C Board Relay 1 Coil naases P C Board Relay 2 amp 3 Coil 00 7 Water PUMP cecceceeeeeeeeeseeeeeeeseeeeees a Contactor Coil inni meg e PGB TIMON sueina enet s Electronic Controls amp Sensors ON Evaporator Sensor seceseereereeeee e Condenser Sensor ccescccscceseeeseeeees jo e Ice Level Control ccecsesseeeeeerees HARVEST Drain portion first 15 sec Electrical components
8. its mounting pads 8 Use clean damp cloth to wipe the surfaces inside the storage bin and the outside of the cabinet 9 See data plate on the rear side of the unit and check that local main voltage corresponds with the voltage specified on it CAUTION Incorrect voltage supplied to the icemaker will void your parts replacement program 10 Remove the manufacturers registration card from the inside of the User Manual and fill in all parts including Model and Serial Number taken from the data plate Forward the completed self addressed registration card to the SCOTSMAN Europe Frimont factory 11 If necessary fit the four legs into their seats on the machine base and adjust them to the desired level C LOCATION AND LEVELING WARNING This Ice Cuber is designed for indoor installation only Extended periods of operation at temperature exceeding the following limitations will constitute misuse under the terms of the SCOTSMAN Manufacturer s Limited Warranty resulting in LOSS or warranty coverage 1 Position the unit in the selected permanent location Criteria for selection of location include a Minimum room temperature 10 C 50 F and maximum room temperature 40 C 100 F b Water inlet temperatures minimum 5 C 40 F and maximum 40 C 100 F c Well ventilated location for air cooled models Clean the air cooled condenser at frequent intervals d Service access adequat
9. line flexible hose 3 4 male fitting Vented drain Open trapped vented drain Drain fitting Main switch Power line CONOARWN gt WARNING This icemaker is not designed for outdoor installation and will not function in ambient temperatures below 10 C 50 F or above 40 C 100 F This icemaker will malfunction with water temperatures below 5 C 40 F or above 40 C 100 F Page 7 OPERATING INSTRUCTIONS START UP After having correctly installed the ice maker and completed the plumbing and electrical connections perform the following Start up procedure A Give power to the unit to start it up by switching ON the power line main disconnect switch sump reservoir to fill it up and also that the incoming surplus of water flows out through the overflow pipe into the drain line During the water filling phase the components energized are THE WATER INLET SOLENOID VALVE THE HOT GAS SOLENOID VALVE THE WATER DRAIN SOLENOID VALVE NOTE Every time the unit returns under power after having been switched off the water inlet valve the hot gas valve and the water drain valve get energized for a period of 5 minutes thus to admit new water to the machine sump reservoir to fill it up and eventually to wash off any dirt that can have deposited in it during the unit off period Fig 1 B During the water filling operation check to see that the incomin
10. E SHAPE LITTLE OR NO ICE IN CENTER OF CUBES SHALLOW SIZE THICK BULGE SOLID ICE OVER SIZE Page 22 WIRING DIAGRAM AC 105 AIR AND WATER COOLED 230 50 1 SERVICE DIAGNOSIS Page 23 SYMPTOM POSSIBLE CAUSE SUGGESTED CORRECTION Unit will not run No warning LEDS glows Green LED Power ON glows Bin full LED glows Red alarm LED glows Red alarm LED blinks Blown power in fuse in P C Board Main switch in OFF position Inoperative P C Board Loose electrical connections P C Board selector in STAND BY Blown power out fuse in P C Board Inoperative ice level control Inoperative P C Board High head pressure High evaporating temperature after 10 mins beginning freeze Replace fuse amp check for cause of blown fuse Turn switch to ON position Replace P C Board Check wiring Move to OPERATING position Replace fuse amp check for cause of blown fuse Clean or replace ice level control Replace P C Board Dirty condenser Clean Inoperative fan motor Replace Shortage of water WC Hot gas valve leak Replace it Water inlet valve leak Replace it Evap sensor inoperative Replace it Short of refrigerant Compressor cycles intermittently Low voltage Contactor with burnt contacts Non condensable gas in system Compressor starting device with loose wires Mechanical problem Check circuit for overloading Check voltage
11. Loads ON COMPIESSOM cceeeceeeceeeeeeeeteesneeeeeeeneeeees Fan Motor Air cooled only and TRIAC Hot Gas Valve eecceeeeceeeeeseeesesteeeeseees Water Inlet Valve ccceeeeeeeeeneeeees Water Drain valve c cceceeteeeeeeees P C Board Relay 1 amp 2 Coil P C Board Relay 3 Coil oes Water PUMP 0 00 eeeeeeeeeeeneeeeeneeeeeneeeeeees Contactor Coil eeceeeeeeeeeeeeeteeeneeeees P GiB TIM Fieve tienen siete Electronic Controls amp Sensors ON Evaporator Sensor cceecceeeeeeeeeeneees Condenser Sensor ccccccesssseeeeeeees Ice Level Control cccccccssceceesssseeeee HARVEST Water filling portion Electrical components Loads ON COMPIESSOM ceeeeceseceeeeeeeeeeeteeeeeeeeneeees Fan Motor Air cooled only and TRIAC Hot Gas Valve eeccecesceeeeseeesesteeesseees Water Inlet Valve cceeeeeeeeeeeeeeees Water Drain valve c cecceeteeeeeeeeees P C Board Relay 1 amp 2 Coil P C Board Relay 3 Coil se Water PUMP 0 0 eeeeeeeseeeeeneeeesneeeeeneeeees Contactor Coil ccccscccesseeeeesteeeeees P C Board Timer cccccccsccsccsseeseeseeeees ig Electronic Controls amp Sensors ON Evaporator Sensor seses Condenser Sensor ccccccesssseeeeeeees Ice Level Control ccccccccssceceesssseeees OFF OFF OFF OFF OFF OFF OPERATING CHARACTERISTICS AC 105 Free
12. RATURE SENSOR The condenser temperature sensor probe located within the condenser fins air cooled version or in contact with the tube coil water cooled version detects the condenser tempe rature 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 70 C 160 F on air cooled models or 62 C 145 F on water cooled models the current arriving to the micro processor is such to cause an immediate and total stop of the machine operation C ICE BIN LEVEL LIGHT CONTROL The electronic ice bin level control located into the storage bin has the function to stop the operation of the ice machine when the light beam between the light source and the sensor is interrupted by the ice cubes stored into the bin Page 18 When the light beam is interrupted the RED LED located in the front of the P C BOARD goes off in case the light beam is constantly interrupted for more than 60 seconds the ice machine stops with the glowing up of the 2nd YELLOW LED to monitor the situation of ice bin full The 60 seconds of delay prevent that an ice scoop movement or the ice dropping through the ice chute interrupting for a whi
13. SERVICE MANUAL AC 105 Electronic cubers with storage SCOTSMAN TABLE OF CONTENTS Page Table of contents page Specifications AC 105 GENERAL INFORMATION AND INSTALLATION Introduction Unpacking and Inspection Location and levelling Electrical connections Water supply and drain connections Final check list Installation practice OPERATING INSTRUCTIONS Start up Operational checks OPERATING PRINCIPLES How it works Freezing cycle Harvest cycle Control sequence Component description ADJUSTMENT REMOVAL AND REPLACEMENT PROCEDURES Adjustment of the cube size Wiring diagram Service diagnosis MAINTENANCE AND CLEANING INSTRUCTIONS General Icemaker Cleaning instructions of water system po oannar A 12 15 16 17 21 22 23 26 26 27 Page 2 SPECIFICATIONS ELECTRONIC CUBER MODEL AC 105 L Important operating requirements MIN MAX Air temperature 10 C 50 F 40 C 100 F Water temperature 5 C 40 F 40 C 100 F Water pressure 1 bar 14 psi 5 bar 70 psi Electr voltage variations from voltage rating specified on nameplate 10 10 AIR COOLED MODELS WATER COOLED MODELS Kg C Kg C 50 10 50 10 48 24 48 21 46 46 g 44 Ww g 44 a WW ae D 42 wi 42 T N N x 32 o oc w Lu w Wu D 40 A a 40 faii a a fe 38 38 H ro 38 H a D H a Z a zZ O 36 m O 36 m c
14. Wait till the end of defrost cycle then with the help of anormal screwdriver turnthe program selector head on STAND BY position to temporaly stop the operation Fig 8 Cleaning 3 Prepare the cleaning solution by diluting in a plastic container two liters of warm water 45 50 C with a 0 2 liters of SCOTSMAN Ice Machine Cleaner WARNING The 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 4 Scoop out all the ice cubes stored into the bin in order to prevent them from being contaminated with the cleaning solution then flush out the water from the sump reservoir by removing the overflow stand pipe e EVAPORATOR O Z 2L a on 2 CONDENSER Lo ee ee ELECTR lt TIMER Lu S Lu wn Nu wn O88 m a COMPRESSOR WATER DRAIN VALVE HOT GAS VALVE CLT OQO ef CONTACTOR COIL dn ae ELECTRONIC CARD Page 28 5 Remove the evaporator cover then slowly pour onto the evaporator platen the cleaning solution With the help of a brush dissolve the most resistant and remote scale deposits in the platen 6 Set the program selector head on CLEANING RINSING The 5th YELLOW LED lights up Fig 9 Sanita
15. c hi pressure control activates the second coil of the water inlet solenoid valve so to supply a metered amount of water to the condenser and drop down its temperature and pressure l HOT GAS SOLENOID VALVE The hot gas solenoid valve consists basically in two parts the valve body and the valve coil Located on the hot gas line this valve is energized through the micro processor of P C BOARD during the defrost cycle as well as during the water filling phase During the defrost cycle the hot gas valve coil is activated so to attract the hot gas valve piston in order to give way to the hot gas discharged from compressor to flow directly into the evaporator serpentine to defrost the formed ice cubes J FAN MOTOR Air cooled version The fan motor is controlled through the P C BOARD and the TRIAC by the condenser tempe rature sensor Normally it operates only during the freezing cycle to draw cooling air through the Page 20 condenser fins In the second part of the freezing cycle the fan motor can run at intermittance as the condenser pressure must be kept between two corresponding head pressure values K COMPRESSOR The hermetic compressor is the heart of the refrigerant system and it is used to circulate and retrieve the refrigerant throughout the entire system It compresses the low pressure refrigerant vapor causing its temperature to rise and become high pressure hot vapor which is then released through the discharge
16. e and clearness of the ice cubes and that they do not have any acid taste ATTENTION In case the ice cubes are cloudy white and have an acid taste melt them immediately by pouring on them some warm water This to prevent that somebody could use them NOTE By setting the selector on RE SET first and then to FREEZING OPERATION the ice maker will perform the 5 minutes WATER FILLING phase i e the water inlet solenoid valve opens to allow the incoming water to rinse again the water system and to properly fill up the sump reservoir for the next freezing cycle 15 Wipe clean and rinse the inner surfaces of the storage bin REMEMBER To prevent the accumulation of undesirable bacteria it is necessary to sanitize the interior of the storage bin with an anti algae disinfectant solution every week
17. e beginning of the freezing cycle it has not yet reached the evaporator tem perature of 15 C 5 F the machine goes straight into the defrost cycle omitting the timed portion of the freezing cycle relied to the setting of the first four DIP SWITCHES NOTE The length of the defrost cycle not adjustable is related to the length of the second phase of freezing cycle T2 Time to drop the evaporating temperature from 0 C 32 F to 13 C 8 5 F The electrical components in operation during this phase are COMPRESSOR WATER INLET VALVE HOT GAS VALVE WATER DRAIN VALVE and the WATER PUMP on the first 15 seconds The incoming water passing through the water inlet valve and the flow control runs over the evaporator platen and then flows by gravity through the dribbler holes down into the sump reservoir Fig F and H The water filling the sump reservoir forces part of the surplus water from the previous freezing cycle to go out to the waste through the overflow pipe This overflow limits the level of the sump water which will be used to produce the next batch of ice cubes Meanwhile the refrigerant as hot gas discharged from the compressor flows through the hot gas valve directly into the evaporator serpentine by passing the condenser The hot gas circulating into the serpentine of the evaporator warms up the copper molds causing the defrost of the ice cubes The ice cubes released from the cups dr
18. e space must be left for all service connections through the rear of the ice maker A minimum clearance of 15 cm 6 must be left at the sides of the unit for routing cooling air drawn into and exhausted out of the compartment to maintain proper condensing operation of air cooled models 2 Level the unit in both the left to right and front to rear directions D ELECTRICAL CONNECTIONS See data plate for current requirements to determine wire size to be used for electrical connections All SCOTSMAN icemakers require a solid earth wire All SCOTSMAN ice machines are supplied from the factory completely pre wired and require only electrical power connections to wire cord provided at the rear of the unit Make sure that the ice machine is connected to its own circuit and individually fused see data plate for fuse size The maximum allowable voltage variation should not exceed 10 and 10 of the data plate rating Low voltage can cause faulty functioning and may be responsible for serious damage to the overload switch and motor windings NOTE All external wiring should conform to national state and local standards and regulations Check voltage on the line and the ice maker s data plate before connecting the unit E WATER SUPPLY AND DRAIN CONNECTIONS GENERAL When choosing the water supply for the ice cuber consideration should be given to a Length of run b Water clarity and purity c Adequate wat
19. ed in avery short time in order to avoid frequent start and stop every few seconds of the electrical components which may damage them specially the compressor The 9th key allows the operation of the water pump even during the defrost cycle as required when it is necessary to drain out the remaining water from the sump The 10th key is used to supply power to the water pump for the first 15 seconds of the defrost cycle position OFF and for the first 30 seconds position ON F WATER SPRAY SYSTEM Through its nozzles the water pumped is sprayed in each individual cup to be frozen into ice It consists of one spray tube wheve are located several spray nozzles G WATER PUMP The water pump operates continually throughout the freezing cycle and on the first 15 or 30 seconds of the defrost cycle so to such the remaining water from the sump tank reach in mineral salts and drain it out During the freezing cycle the pump primes the water from the sump to the spray system and through the spray nozzles sprays it into the inverted cup molds to be frozen into crystal clear ice cubes Itis recommended that the pump motor bearings be checked at least every six months H WATER INLET SOLENOID VALVE 3 4 MALE FITTING Water cooled version A special water inlet solenoid valve with one inlet and two outles one for condenser and the second for the production of ice is used on water cooled version An automati
20. ed version FAN MOTOR OUT OF OPERATION Air cooled version AMBIENT TEMPERATURE HIGHER THEN 40 C 100 F itcauses the total and immediate SHUT OFF of the machine in order to prevent the unit from operating in abnormal and dangerous conditions When the ice maker stops on account of this protective device there is a simultaneous glowing of the RED LED warning the user of the Hi Temperature situation After having eliminated the source of the condenser hi temperature to restart the machine it is necessary first to rotate for a while the program selector on RE SET position then again on OPERATION position or to unplug wait few seconds and plug in again the unit The ice machine resumes its normal operation by going through the 5 minutes water filling phase At the start of the freezing cycle the refrigerant suction or lo pressure lowers rapidly to 1 bar 14 psig then it declines gradually in relation with the growing of the ice thickness to reach at the end of the cycle approx 0 bar 0 psig with the cubes fully formed in the cup molds The total length of the freezing cycle ranges from 20 to 25 minutes Page 15 DEFROST OR HARVEST CYCLE Fig E and G As the electronic timer has carried the system throughout the second phase of freezing cycle the defrost cycle starts ATTENTION In case the unit is able to reach 0 C 32 F evaporating temperatu re within 15 minutes but after 45 minutes from th
21. er or not the cube size problem exists l Ifthe cubes are shallow size Indentation is too deep probably the length of the second phase of the freezing cycle is too short so to extend such length you have to 1 Locate the DIP SWITCH on the front of the P C Board 2 Take note ofthe combination of the first four DIP SWITCH KEYS and check the corrisponding length of freezing cycle 2nd phase on Table B 3 Set the same DIP SWITCH KEYS to correspond to the prior combination shown on Table B which allow an extention of two more minutes of the length of the freezing cycle 4 Observe the ice cubes in the next two harvests and eventually repeat steps 2 and 3 above until proper ice cubes size is achieved See figure Il Ifthe cubes are oversize size Indentation is too full probably the length of the second phase of the freezing cycle is too long To shorten such length you have to 1 Locate the DIP SWITCH on the front of the P C Board 2 Take note ofthe combination of the first four DIP SWITCH KEYS and check the corrisponding length of freezing cycle 2nd phase on Table B 3 Set the same DIP SWITCH KEYS to correspond to the next combination shown on Table B which allow a reduction of two minutes of the length of the freezing cycle 4 Observe the ice cubes in the next two harvests and eventually repeat steps 2 and 3 above until proper ice cubes size is achieved See figure SMALL IDENTATION NORMAL SIZ
22. er supply pressure Since water is the most important single ingredient in producting ice you cannot emphasize too much the three items listed above Low water pressure below 1 bar may cause malfunction of the ice maker unit Water containing excessive minerals will tend to produce cloudy coloured ice cubes plus scale build up on parts of the water system WATER SUPPLY Connect the 3 4 male fitting of the solenoid water inlet valve using the flexible tube supplied tothe cold water supply line with regular plumbing fitting and a shut off valve installed in an accessible position between the water supply line and the unit If water contains a high level of impurities it is advisable to consider the installation of an appropriate water filter or conditioner Page 5 On Water Cooled version the water inlet solenoid valve has two separate outlets one for the condenser and the second for the production of ice WATER DRAIN The recommended drain tube is a plastic or flexible tube with 18 mm 3 4 I D which runs to an open trapped and vented drain When the drain is a long run allow 3 cm pitch per meter 1 4 pitch per foot Avent atthe unit drain connection is also required for proper sump drainage WATER DRAIN WATER COOLED MODELS Connect the 3 4 male fitting of the condenser water drain utilizing a second flexible tubing to the open trapped and vented drain NOTE The water supply and the water drain must be in
23. g water dribbles through the evaporator platen dribbler holes down into the NOTE If in the 5 minutes lenght of the water filling phase the machine sump reservoir does not get filled with water up to the rim of the overflow pipe it is advisable to check 1 The water pressure of the water supply line that must be atleast 1 bar 14 psig Minimum Max 5 bar 70 psig 2 The filtering device installed in the water line that may reduce the water pressure below the Minimum value of 1 bar 14 psig 3 Any clogging situation in the water circuit like the inlet water strainer and or the flow control a EVAPORATOR SA wn 6 O n i CONDENSER BA ELECTR q TIMER LUI S yah Jo z Rx aS i mO co O wn ta am Qa 5 oO WATER DRAIN VALVE HOT GAS VALVE ae CONTACTOR COIL ELECTRONIC CARD Page 8 C At completion of the water filling phase 5 minutes the unit passes automatically into the freezing cycle with the start up of COMPRESSOR WATER PUMP FAN MOTOR in air cooled version controlled by the condensing temperature sensor located within the condenser fins Fig 2 OPERATIONAL CHECKS D Install if required the refrigerant service gauges on both the high side and low side Scraeder valves to check the compressor head and suction pressures NOTE On air cooled models the condenser temperature sensor which is located within the co
24. ic brush taking care to do not damage both the condenser and ambient temperature sensors 5 Check for water leaks and tighten drain line connections Pour water down bin drain line to be sure that drain line is open and clear 6 Check size condition and texture of ice cubes Perform adjustment of DIP SWITCH keys as required 7 Check the ice level control sensor to test shut off Put your hand between the light source and the receiver so to cut off the light beam for at least one minutes This should cause the ice maker to shut off and the light up of the 2nd LED yellow light BIN TEMPERATURE SENSORS COMPRESSOR WATER DRAIN VALVE HOT GAS VALVE a ae CONTACTOR COIL ELECTRONIC CARD IMPORTANT Perform the above check only at the end of harvest cycle or at the beginning of freezing cycle in order to do not cause to the unit to make a double freezing cycle NOTE Within few seconds after the removal ofthe hand from the Infrared sensing light the icemaker restarts in freezing cycle The ice level control uses devices that sense light therefore they must be kept clean enough so they can see Every month clean wipe the sensing eyes with a clean soft cloth A 9 Check for refrigerant leaks Page 27 C CLEANING INSTRUCTIONS OF WATER SYSTEM 1 Remove the front and the top panels to gain access either to the control box and to the evaporator 2
25. le the light beam can stop the operation of the unit As soon as the ice is scooped out with the resumption of the light beam between the two infrared sensor of ice level control the RED LED is lighted up and after 6 seconds the ice machine restarts again with the extinguishing the 2nd YELLOW LED D P C BOARD Data processor The P C BOARD fitted in its plastic box located in the front of the unit consists of two separated printed circuits one at high and the other at low voltage integrated with a program selector of two fuses one on power in 100mA and one on power out 16 A of five aligned LEDS monitoring the operation of the machine of two extra monitoring RED LEDS of one DIP SWITCH with ten keys of one small jumper located on its back side of input terminals for the leads of the sensor probes and input and output terminals for the leads of the ice maker electrical wires The P C BOARD is the brain of the system and it elaborates through its micro processor the signals received from the four sensors in order to control the operation of the different electrical components of the ice maker compressor water pump solenoid valves etc By turning the program selector it is possible to put the unit in the following different situations CLEANING RINSING The water pump is the only electrical component in operation and it must be used during the cleaning or the rinsing procedure of the water system of ice machine
26. lter then it goes all the way through the capillary tube where due to the heat exchanging action it looses some of its heat contentso that its pressure and temperature are lowered as well Next the refrigerant enters into the evaporator serpentine which has a larger D then the capillary and starts to boil off this reaction is emphasized by the heat transferred by the sprayed water The refrigerant then increases in volume and changes entirely into vapor The vapor refrigerant then passes through the suction accumulator used to prevent that any small amount of liquid refrigerant may reach the compressor and through the suction line In both the accumulator and the suction line it exchanges heat with the refrigerant flowing into the capillary tube warmer before to be sucked in the compressor and to be recirculated as hot compressed refrigerant gas The freezing cycle is controlled by the evaporator temperature sensor which has its probe in contact with the evaporator serpentine that determines the length of its first portion of the cycle When the temperature of the evaporator serpentine drops to a pre set value the evaporator sensor probe changes its electrical resistance allowing a low voltage current 15 volts to flow to the P C BOARD which in turn activates an electronic timer The timer which is built in the P C BOARD takes over from the evaporator temperature sensor the control of the freezing cycle up to its
27. n the P C BOARD The timer adjustment is factory set in consideration of the ice maker type cooling version and ice cube size Small Medium Large It is possible however to modify the timed lenght of the freezing cycle by changing the DIP SWITCH keys setting In Table B of PRINCIPLE OF OPERATION are shown the various time extensions of the freezing cycle second phase in relation with the different DIP SWITCH keys setting G After about 17 20 minutes from the begin ning of the freezing cycle in an hypothetic ambient temperature of 21 C the defrost cycle takes place with the hot gas the water inlet and the water drain valves simoultaneously activated Fig 5 The electrical components in operation on models are COMPRESSOR WATER INLET VALVE HOT GAS VALVE WATER DRAIN VALVE and the WATER PUMP on the first 15 seconds NOTE The lenght of the defrost cycle not adjustable is automatically determinated by the micro processor of the P C BOARD in relation of the time necessary for the unit to reduce the evaporator temperature from 0 C 32 F to 13 C 8 5 F TIME T2 H Check during the defrost cycle that the incoming water flows correctly into the sump reservoir in order to refill it and that the surplus overflows through the overflow drain tube CONDENSER PA BIN TEMPERATURE SENSORS COMPRESSOR WATER DRAIN VALVE ELECTRONIC CARD I Check the text
28. ndenser fins keep the head condensing pressure between 8 5 and 9 5 bar 110 130 psig Incase of condenser clogging such to prevent the proper flow of the cooling air or in case the fan motor is out of operation or shortage of water in the water cooled condenser the condenser temperature rises and when it reaches 70 C 160 F for air cooled version of 62 C 145 F for water cooled version the condenser temperature sensor shuts off the ice maker with the consequent light up of the RED WARNING LIGHT Fig 3 After having diagnosed the reason of the rise of temperature and removed its cause it is necessary to turn the head of the selector always using an appropriate scewariver first on the RE SET position then return it on previous OPERATION position or unplug wait few seconds and plug in again the unit thus to put the machine in condition to initiate a new freezing cycle The machine restarts with the usual 5 minutes water filling phase in order to provide enough water into the sump tank CONDENSER BIN TEMPERATURE SENSORS COMPRESSOR EVAPORATOR W 0000 Swit a O a HOT GAS VALVE S42 Qo O i w WATER DRAIN VALVE O Q OO B CONTACTOR COIL Fy FAN MOTOR a CO C ae ae WATER PUMP ao ELECTRONIC CARD Page 9 WATER DRAIN VALVE cn EVAPORATOR
29. neered and manufactured Their ice making systems are thoroughly tested providing the utmost in flexibility to fit the needs of a particular user NOTE To retain the safety and performance built into this icemaker it is important that installation and maintenance be conducted in the manner outlined in this manual B UNPACKING AND INSPECTION 1 Callyourauthorized SCOTSMAN Distributor or Dealer for proper installation 2 Visually inspect the exterior of the packing and skid Any severe damage noted should be reported to the delivering carrier and a concealed damage claim form filled in subjet to inspection of the contents with the carriers representative present 3 a Cutandremove the plastic strip securing the carton box to the skid b Remove the packing nails securing the carton box to the skid c Cutopen the top of the carton and remove the polystyre protection sheet d Pulloutthe polystyre postfrom the corners and then remove the carton 4 Remove the front and if any the rear panels of the unit and inspect for any concealed damage Notify carrier of your claim for the concealed damage as steted in step 2 above 5 Remove all internal support packing and masking tape Leg package is located in the storage bin compartment 6 Check that refrigerant lines do not rub against or tuch other lines or surfaces and that the fan blade moves freely 7 Check that the compressor fits snugly onto all
30. o oO o 34 lt x E 34 lt x 32 32 30 30 32 27 21 15 10 C 32 27 21 15 10 C WATER TEMPERATURE WATER TEMPERATURE NOTE With the unit in built in conditions the ice production is gradually reduced in respect to the levels shown in the graf up to a maximum of 10 at room temperatures higher than 32 C The daily ice making capacity is directly related to the condenser air inlet temperature water temperature and age of the machine To keep your SCOTSMAN CUBER at peak performance levels periodic maintenance checks must be carried out as indicated on page 26 of this manual Page 3 SPECIFICATIONS CONT D FRONT VIEW HEIGHT without legs HEIGHT with legs WIDTH DEPTH WEIGH T AC 105 CUBER MACHINE SPECIFICATION 813 mm 950 mm 535 mm 534 mm 44 Kgs Model Cond Finish Comp HP ico aN Weler ee AC 105 AS Air S Steel 180 3 8 18 AC 105 WS Water S Steel 530 Electr power cons Basic electr Amps Start Amps Watts Kwh per 24 Hrs No of Wires Amp Fuse 230 50 1 3 5 18 550 10 3x1 m m 10 Cubes per harvest 32 medium At 15 C 60 F water temperature Page 4 GENERAL INFORMATION AND INSTALLATION A INTRODUCTION This manual provides the specifications and the step by step procedures for the installation start up and operation maintenance and cleaning for the SCOTSMAN AC 105 icemakers The Electronic Cubers are quality designed engi
31. op by gravity onto a slanted cube chute then through a curtained opening they fall into the storage bin NOTE The length of the defrost cycle factory set changes in accordance with the duration of the second portion of the freezing cycle Time T2 that is related to the ambient temperature At the end of the defrost cycle the hot gas valve the water inlet valve and the water drain valve close andthe machine starts again anew freezing cycle Page 16 OPERATION CONTROL SEQUENCE At the start of freezing cycle the evaporator temperature sensor controls the length of the first part of the freezing cycle As it reaches a predetermined temperature it supplies a low voltage current to the P C BOARD in order to activate the electronic timer which takes over the control of the freezing cycle for a pre fixed time according to the DIP SWITCH keys setting see Tab B NOTE The evaporator temperature sensor factory pre set is the same for all the models and is not adjustable in the field Once completed the freezing cycle 2nd phase the system goes automatically into the defrost cycle which has also a pre fixed length At completion of the defrost cycle the P C BOARD command the unit to start again a new freezing cycle OPERATION ELECTRICAL SEQUENCE The following charts illustrate which switches and which components are ON or OFF during a particular phase of the icemaking cycle Refer to the wiring
32. receiver To prevent any possible ice maker malfunction due to negative affection of the light detector it is advisable to locate the unit where it is not reached by any direct light beam or light radiation also it is recommended to keep the bin door constantly closed and to follow the instructions for the periodical cleaning of the light sensor elements as detailed in the MAINTENANCE AND CLEANING PROCEDURES K Remove iffitted the refrigerant service gauges and re fit the unit service panels previously removed L Instruct the owner user on the general operation of the ice machine and about the cleaning and care it requires COMPRESSOR FIG 6 Nesey Q Z a o CONDENSER Lu co gt z c a Lu e a WATER DRAIN VALVE ELECTRONIC CARD Page 12 PRINCIPLE OF OPERATION How it works In the SCOTSMAN cube ice makers the water used to make the ice is kept constantly in circulation by an electric water pump which primes it to the spray system nozzles from where it is diverted into the inverted mold cups of the evaporator A small quantity of the sprayed water freezes into ice the rest of it cascades by gravity into the sump assembly below for recirculation FREEZING CYCLE The hot gas refrigerant discharged out from the compressor reaches the condenser where being cooled down condenses into liquid Flowing into the liquid line it passes through the drier fi
33. stalled to conform with the local code In some case a licensed plumber and or a plumbing permit is required F FINAL CHECK LIST 1 Is the unit level IMPORTANT 2 Have all the electrical and plumbing connections been made and is the water supply shut off valve open 3 Has the voltage been tested and checked against the data plate rating 4 Have the bin liner and cabinet been wiped clean 5 _Havethe bolts holding the compressor down been checked to ensure that the compressor is snugly fitted onto the mounting pads 6 Has the owner user been given the User Manual and been instructed on the importance of periodic maintenance checks 7 Has the Manufacturers registration card been filled in properly Check for correct model and serial number against the serial plate and mail the registration card to the factory 8 Check all refrigerant lines and conduit lines to guard against vibrations and possible failure 9 Is the unit in a room where ambient temperatures are within a minimum of 10 C 50 F even in winter months 10 Is there at least a 15 cm 6 clearance around the unit for proper air circulation Page 6 11 Has the water supply pressure been 12 Hasthe owner been given the name and the checked to ensure a water pressure of at least 1 phone number of the authorized SCOTSMAN bar 14 psi Service Agency serving him G INSTALLATION PRACTICE Hand shut off valve Water filter Water supply
34. t its setting stem Excessive water in unit base Water tubing leaking Check Tighten or replace Page 26 MAINTENANCE AND CLEANING INSTRUCTIONS A GENERAL The periods and the procedures for maintenance and cleaning are given as guides and are not to be construed as absolute or invariable Cleaning especially will vary depending upon local water and ambient conditions and the ice volume produced and each icemaker must be maintened individually in accordance with its particular location requirements B ICEMAKER The following maintenance should be scheduled at least two times per year on these icemakers 1 Check and clean the water line strainer 2 Check that the icemaker is levelled in side to side and in front to rear directions 3 Clean the water system evaporator bin and spray jets using a solution of SCOTSMAN Ice Machine Cleaner Refer to procedure C cleaning instructions and after cleaning will indicate frequency and proce dure to be followed in local areas NOTE Cleaning requirements vary according to the local water conditions and individual user operation Continuous check of the clarity of ice cubes and visual inspection of the water spraying parts before and after cleaning will indicate frequency and proce dure to be followed in local areas 4 With the ice machine and fan motor OFF on air cooled models clean condenser using vacuum cleaner whisk broom or non metall
35. ter valve Non condensable gas in system Poor air circulation or excessive hot location Red alarm LED glows Overcharge of refrigerant Capillary tube partially restricted Hot gas solenoid valve leaking Undercharge of refrigerant Discharge head pressure too high Replace Repair or replace Purge the system Relocate the unit or provide for more ventilation Correct the charge Purge off slowly Blow charge add new gas amp drier after evacuating system with vacuum pump Replace valve Charge to data plate indication See incorrect discharge pressure Poor harvest Restriction in incoming water line Water inlet valve not opening Hot gas valve orifice restricted Air vented holes in mold cups Discharge head pressure too low Check water valve strainer and flow control If necessary enlarge the flow control orifice Valve coil with open winding Replace valve Replace hot gas valve assy Clean out holes plugged See incorrect discharge pressure Page 25 SERVICE DIAGNOSIS SYMPTON POSSIBLE CAUSE SUGGESTED CORRECTION Unit won t harvest Inoperative P C Board Replace P C Board Hot gas valve not opening Valve coil with open winding Replace valve Water solenoid valve not opening Valve coil with open winding Replace valve Incorrect discharge pressure Inoperative condenser sensor Replace sensor Inoperative P C Board Replace P C Board Water regulating valve misadjusted Adjus
36. tion NOTE Sanitation of the water system is recommended to be done once a month NOTE With the system in CLEANING RINSING mode the water pump is the only component in operation to circulate the cleaning solution in the entire water system 11 Prepare ina plastic container the sanitation solution as per manufacturer dilution using warm water 45 50 C NOTE Never mix the cleaning with the sanitising solution 7 Let the unit to remain in the CLEANING RINSING mode for about 20 minutes then turn the program selector on STAND BY again 8 Flush out the cleaning solution from the sump reservoir then pour onto the evaporator cavity two or three liters of clean potable water to rinse the mold cups and the platen If necessary remove the water spray bar and spray jets to clean them separately 9 Turn again the program selector on CLEANING RINSING The water pump is again in operation to circulate the water in order to rinse the entire water system 10 Flush out the rinsing water from the sump reservoir then turn the program selector on RE SET HI TEMPERATURE position and immediately afterward to FREEZING OPERATION 12 Follow the procedures as per cleaning from item 4 to item 10 just shorting the operation of the water pump to 10 minutes 13 Place again the evaporator cover and the unit service panels 14 At completion of the freezing and harvest cycle make sure of proper textur
37. ure of ice cubes just released They have to be in the right shape with a small depression of about 5 6 mm in their crown If not wait for the completion of the second cycle before performing any adjustment If the ice cubes are shallow and cloudy it is possible that the ice maker runs short of water during the freezing cycle second phase or the quality of the supplied water requires the use of an appropriate water filter or conditioner J To be sure of the correct operation of ice level control device place one hand between its sensing eyes to interrupt the light beam The RED LIGHT located in the front of the P C BOARD goes immediately OFF and after 60 seconds the unit stops with the simultaneous glowing of the 2nd YELLOW LIGHT to monitor the BIN FULL situation Fig 6 Take the hand out from the ice level control sensors to allow the resumption of the light beam the RED LIGHT located in the front of the P C BOARD will glow immediately After approximately 6 seconds the ice maker resume its operation with the immediate glowing Page 11 ofthe FOURTH YELLOW LIGHT indicating UNIT IN OPERATION and the extinguishing of the BIN FULL YELLOW LIGHT NOTE The ICE LEVEL CONTROL INFRARED SYSTEM is independent of the temperature however the reliability of its detection can be affected by external light radiations or by any sort of dirt and scale sediment which may deposit directly on the light source and on the
38. valve L HI PRESSURE CONTROL Water cooled version Used only onthe water cooled versions it operates to keep between 9 5 and 10 5 bars 135 150 psig the hi side or discharge pressure of the refrigerant system by energizing the coil of the water inlet solenoid valve that control the cooling water flow to the condenser M WATER DRAIN SOLENOID VALVE The water drain solenoid valve electrically connected in parallel to the water inlet and to the hot gas solenoid valves is energized for all the length of the defrost cycle By means of the water pump that remains energized for 15 seconds at the beginning of the defrost cycle it allows the drain out of all remaining water rich of minerals deposited during the previous freezing cycle from the sump tank By doing so it allows to the ice maker to make every new freezing cycle with new fresh water avoiding thereby the accumulation of sediments and scales which soon or later will cause the partial or total clogging of the water system on the unit Page 21 ADJUSTMENT PROCEDURES A ADJUSTMENT OF THE CUBE SIZE CAUTION Before performing actual adjustment of the cube size check other possible causes for cube size problems refer to the Service Diagnosis Section for problem review and analysis Do not perform any adjustment till the icemaking system has progressed through several complete freezing and harvest cycle to observe size and quality of ice cubes and wheth
39. ze Cycle Average Discharge Pressure A C 9 5 8 5 bar 130 110 psig Average Discharge Pressure W C 10 5 9 5 bar 150 135 psig Suction Pressure End Freeze Cycle 0 0 1 bar 0 1 psig REFRIGERANT CHARGE R 134 A Air cooled 320 gr 11 oz Water cooled AC 105 250 gr 9 0z Page 17 COMPONENTS DESCRIPTION A EVAPORATOR TEMPERATURE SENSOR The evaporator temperature sensor probe located in contact with the evaporator serpentine detects the dropping of the evaporator tempera ture during the freezing cycle and signals it by supplying a current flow to the micro processor of P C BOARD According to the current received the micro processor supplies power to the electronic timer built into the P C BOARD so that it takes control of the length of the 2nd phase of freezing cycle The length of the timed phase is pre fixed by the setting of the keys 1 2 3 and 4 of the DIP SWITCH The activation of the electronic timer is indicated by the lighting up of the RED LED placed in the front of the P C BOARD This lighting up occures usually in the mid period of the freezing cycle and signals the switching from the first to the second phase of the freezing cycle NOTE Whenever after 15 minutes from the beginning of the freezing cycle the evaporating temperature have not yet reached the value of 0 C 32 F the P C Board switches OFF the machine with the BLINKING of RED LED B CONDENSER TEMPE

Download Pdf Manuals

image

Related Search

Related Contents

AVR 142 - Harman Kardon  Sony AC V17 User's Manual  XGB Positioning  Modine® Effinity 93® Model PTC Installation & Service Manual  MB-Resize - User Manual  東京ゲームショウ2007 ブース内容一覧 第二弾  Manuales Manual de instalación  Toshiba RAS-3M26YAV-E User Guide Manual AIR CONDITIONER  Lexmark 2I1 Printer User Manual  

Copyright © All rights reserved.
Failed to retrieve file