Related Manuals for Scotsman MXG Series
Summary of Contents for Scotsman MXG Series
- Page 1 MXG SERIES MXG SERIES CUBERS TECHNICAL SERVICE TRAINING Welcome to another Scotsman technical service presentation This one will cover the electronic MXG series Ice Cube Machines...
- Page 2 NEW MXG SERIES MXG 328 A/W Max. Ice Production = 150 Kg/24h* 10/10°C= Air & Water Inlet Temperature...
- Page 3 NEW MXG SERIES MXG 428 A/W Max. Ice Production = 195 Kg/24h* 10/10°C= Air & Water Inlet Temperature...
- Page 4 NEW MXG SERIES MXG 438 A/W Max. Ice Production = 195 Kg/24h 10/10°C = Air & Water Inlet Temperature...
- Page 5 NEW MXG SERIES MXG 638 A/W Max. Ice Production = 340 Kg/24h 10/10°C = Air & Water Inlet Temperature...
- Page 6 NEW MXG SERIES MXG 938 A/W Max. Ice Production = 400 Kg/24h 10/10°C = Air & Water Inlet Temperature...
- Page 7 NEW MXG SERIES TOPICS On the next slides are shown the following steps by steps procedures: • UNPACKING • INSTALLATION • START UP AND OPERATIONAL CHECKS • OPERATING PRINCIPLES and COMPONENTS • MAINTENANCE • SERVICE ANALYSIS...
- Page 8 NEW MXG SERIES UNPACKING...
- Page 9 NEW MXG SERIES UNPACKING The machines are supplied in a carton box secured by two plastic strips to a wooden base. Check first the outside conditions of carton box and wooden base then cut the two plastic strips, remove the tape and...
- Page 10 NEW MXG SERIES UNPACKING Slip away – remove plastic strip...
- Page 11 NEW MXG SERIES UNPACKING Remove front panel air filter (AC version only)
- Page 12 NEW MXG SERIES UNPACKING Remove front panel screws and the panel...
- Page 13 NEW MXG SERIES UNPACKING Remove top panel screws and the panel...
- Page 14 NEW MXG SERIES UNPACKING Remove I/R bracket installation instruction and water inlet and outlet hoses...
- Page 15 NEW MXG SERIES UNPACKING Remove side panels screws and the panels...
- Page 16 NEW MXG SERIES UNPACKING …..unscrew the unit frame from the wooden base….
- Page 17 NEW MXG SERIES UNPACKING The Modular Cuber machines require for the installation the use of a companion storage bin to store the ice produced. Perfect “matching” storage been are: SB 193 – 322 for MXG 328-428 SB 393 – 530 for MXG 438-638-938...
- Page 18 NEW MXG SERIES UNPACKING Due to design reason MXG series can not be stacked: • Ice chutes not aligned • Not enough space for Service over the bottom unit top evaporator • Not possible to remove bottom unit front panel...
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Page 19: Installation
NEW MXG SERIES INSTALLATION... - Page 20 NEW MXG SERIES INSTALLATION After having installed the ice maker on top of chosen bin, remove polystyrene block form ice chute top and remove the ice chute. locate I/R and its bracket, release the same from clamps...
- Page 21 NEW MXG SERIES INSTALLATION Cut the unit base gasket , pass the I/R sensor through the same reaching the inner bin area.
- Page 22 NEW MXG SERIES INSTALLATION Fix the IR supplied screws to related bracket...
- Page 23 NEW MXG SERIES INSTALLATION Fix IR bracket at ice chute discharge area by stainless steel screw...
- Page 24 NEW MXG SERIES INSTALLATION Once installed optical level sensor, re-install ice chute previously removed paying attention to hang the same to its hook rim point.
- Page 25 NEW MXG SERIES INSTALLATION MXG 328-428-438-938 Note different location according to MXG models MXG 638...
- Page 26 NEW MXG SERIES INSTALLATION Check the data plate of the machine located on the rear panel for correct voltage as well as for the proper wiring/fuse size. Remember that all machines require a solid earth wire.
- Page 27 NEW MXG SERIES INSTALLATION Check for the correct water and ambient conditions that should be: • Min. ambient temperature 10ºC (50F) • Max. ambient temperature 40ºC (100F) • Min. water temperature 5ºC (40F) • Max. water temperature 35ºC (90F) • Min. water pressure 1 bar (14 PSI) •...
- Page 28 NEW MXG SERIES INSTALLATION Min. space 15 cm Adequate space must be left for proper water and electrical connections on the rear side of the machine. A minimum clearance of 15 cm on both sides for best routing air.
- Page 29 NEW MXG SERIES INSTALLATION 328 – 428 - 438 air flow filter filter...
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Page 30: Air Flow
NEW MXG SERIES INSTALLATION 638 air flow filter filter... - Page 31 NEW MXG SERIES INSTALLATION 938 air flow filter filter...
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Page 32: Stacking Installation
NEW MXG SERIES STACKING INSTALLATION Level the unit on both directions front to rear and right to left side using the adjustable legs. -
Page 33: Installation - Electrical
NEW MXG SERIES INSTALLATION - ELECTRICAL Install, on the cable supply with the machine, an adequate electrical plug according to the local standards and regulations. Maximum voltage variation should be ±10%. Machine must be individually fuse protected. - Page 34 NEW MXG SERIES INSTALLATION – WATER PIPING Connect the water inlet 3/4” male threat of the water inlet solenoid valve to the water supply line by means of the rubber hose provided with machine.Install on water supply line closed to the machine a water valve (tap).
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Page 35: Typical Installation
NEW MXG SERIES TYPICAL INSTALLATION AIR COOLED VERSION POWER HAND DISCONNECT SWITCH WATER VALVE WATER INLET WATER FILTER WATER DRAIN WATER DRAIN... - Page 36 NEW MXG SERIES INSTALLATION On the water cooled version there are two separate 3/4” male thread water inlet fittings…..
- Page 37 NEW MXG SERIES INSTALLATION …..a second separate drain hose must be connected to the outlet 3/4” male fitting located on the upper side of the water regulating valve.
- Page 38 NEW MXG SERIES TYPICAL INSTALLATION WATER COOLED VERSION POWER HAND DISCONNECT SWITCH WATER WATER INLET VALVE WATER FILTER WATER DRAIN WATER DRAIN...
- Page 39 NEW MXG SERIES START UP AND OPERATIONAL CHECKS...
- Page 40 NEW MXG SERIES START UP AND OPERATIONAL CHECKS Open the water tap/valve and Switch ON the power on the electrical supply line.
- Page 41 NEW MXG SERIES START UP AND OPERATIONAL CHECKS Green Lighted Master Push Switch located in the front panel. By pushing it is possible to Switch ON and OFF the machine.
- Page 42 NEW MXG SERIES START UP AND OPERATIONAL CHECKS Push the Green Push Button Switch to Start Up the machine...
- Page 43 NEW MXG SERIES START UP AND OPERATIONAL CHECKS A start-up delay is PUSH FREEZING CYCLE factory set at 60’ on the TOO HI COND TEMP TOO HI EVAP TEMP models MXG 638 - 938 BIN FULL with the Yellow LED POWER blinking.
- Page 44 NEW MXG SERIES START UP AND OPERATIONAL CHECKS Once the start delay is elapsed the Ice Machine will start up automatically through the 5 minutes of “Water Filling Phase”.
- Page 45 NEW MXG SERIES START UP AND OPERATIONAL CHECKS The components energized during this period are: • PC Board...
- Page 46 NEW MXG SERIES START UP AND OPERATIONAL CHECKS • Water Inlet Solenoid Valve...
- Page 47 NEW MXG SERIES START UP AND OPERATIONAL CHECKS • Water drain valve...
- Page 48 NEW MXG SERIES START UP AND OPERATIONAL CHECKS • Hot Gas Solenoid Valve...
- Page 49 NEW MXG SERIES START UP AND OPERATIONAL CHECKS ….flows into the small During the first 5’ the water orifice of the “Flow Control” goes through the Water Inlet located on the outlet port of Valve then… the same.
- Page 50 NEW MXG SERIES START UP AND OPERATIONAL CHECKS ..where it flows onto the Following the plastic inlet plastic evaporator platen hose the incoming water dribbling down through the arrive on the upper side of holes located on the corners.
- Page 51 NEW MXG SERIES START UP AND OPERATIONAL CHECKS Dribbled water is collected down into the water sump where is located the overflow that assures the proper water level and quantity for the next freezing cycle.
- Page 52 NEW MXGSERIES START UP AND OPERATIONAL CHECKS Once the start delay is elapsed the Ice Machine will start up automatically through the 5 minutes of “Water Filling Phase”.
- Page 53 NEW MXG SERIES START UP AND OPERATIONAL CHECKS After the first 5’ of water filling phase the machine start up automatically on freezing cycle with the following electrical components in operation: • Compressor...
- Page 54 NEW MXG SERIES START UP AND OPERATIONAL CHECKS • Water Pump...
- Page 55 NEW MXG SERIES START UP AND OPERATIONAL CHECKS • Fan Motor (on air cooled version only)
- Page 56 NEW MXG SERIES START UP AND OPERATIONAL CHECKS • Contactor...
- Page 57 NEW MXG SERIES START UP AND OPERATIONAL CHECKS The operation of the fan motor is controlled by a condenser temperature sensor located within the fins of condenser that transmit a signal to the PC Board to activate in ON-OFF mode the fan motor...
- Page 58 NEW MXG SERIES START UP AND OPERATIONAL CHECKS On PC Board the LED energized are: • Power PUSH FREEZING CYCLE TOO HI COND TEMP TOO HI EVAP TEMP BIN FULL POWER...
- Page 59 NEW MXG SERIES START UP AND OPERATIONAL CHECKS On PC Board the LED energized are: • Power • Freezing PUSH FREEZING CYCLE TOO HI COND TEMP TOO HI EVAP TEMP BIN FULL POWER...
- Page 60 NEW MXG SERIES START UP AND OPERATIONAL CHECKS Water is circulating by the water pump into the inverted tin plated copper molds of the evaporator….
- Page 61 NEW MXG SERIES START UP AND OPERATIONAL CHECKS ….while the refrigerant is flowing into the serpentine welded on the upper side of the tin plated copper molds.
- Page 62 NEW MXG SERIES • EVAPORATOR SENSOR...
- Page 63 NEW MXG SERIES START UP AND OPERATIONAL CHECKS After approximately 5 minutes since the start up of the 0ºC freezing cycle, the temperature of the evaporator serpentine drops down to 0ºC….
- Page 64 NEW MXG SERIES START UP AND OPERATIONAL CHECKS ….with the blinking of the small RED LED located in the center of PC Board.
- Page 65 NEW MXG SERIES START UP AND OPERATIONAL CHECKS After approximately 10 minutes from the start up of the freezing cycle, the -15ºC temperature of the evaporator serpentine drops down to - 15ºC….
- Page 66 NEW MXG SERIES START UP AND OPERATIONAL CHECKS ….with the light ON steady of the small RED LED located in the center of PC Board.
- Page 67 NEW MXG SERIES START UP AND OPERATIONAL CHECKS The machine remains in the freezing cycle till its completion for an additional time according to the set up of the first four DIP SWITCH of the PC Board.
- Page 68 NEW MXG SERIES START UP AND OPERATIONAL CHECKS...
- Page 69 NEW MXG SERIES START UP AND OPERATIONAL CHECKS Once completed the freezing cycle the machine enters into the defrost or harvest cycle with the following electrical components in operation: • Compressor...
- Page 70 NEW MXG SERIES START UP AND OPERATIONAL CHECKS • Water Inlet Solenoid valve...
- Page 71 NEW MXG SERIES START UP AND OPERATIONAL CHECKS • Water Drain Solenoid Valve...
- Page 72 NEW MXG SERIES START UP AND OPERATIONAL CHECKS • Hot Gas Valve...
- Page 73 NEW MXG SERIES START UP AND OPERATIONAL CHECKS SWITCH 5 AND 6 The length of the defrost or harvest cycle is controlled by the PC Board according to the setting of the DIP LENGTH OF HARVEST CYCLE ACCORDING TO THE TIME TO DROP THE SWITCH 5 and 6 and it is EVAP.
- Page 74 NEW MXG SERIES START UP AND OPERATIONAL CHECKS It’s possible to extend the length of the defrost cycle by means of the DIP SWITCH 7 and 8 as per below chart. DIP SWITCH ADDITIONAL DEFROST TIME 30" 60" 90" WATER PUMP OFF...
- Page 75 NEW MXG SERIES START UP AND OPERATIONAL CHECKS During the defrost or harvest cycle the combined action of refrigerant in Hot Gas state and incoming Water are going to partially melt the ice cubes in contact with the tin plated copper...
- Page 76 NEW MXG SERIES START UP AND OPERATIONAL CHECKS Ice maker turns OFF just when bin is full by ice and cubes cut the I/R beam. It is possible to test I/R operation by keeping some ice cubes between lenses during...
- Page 77 NEW MXG SERIES START UP AND OPERATIONAL CHECKS The Bin Full YELLOW LED starts to blink slow. PUSH FREEZING CYCLE TOO HI COND TEMP TOO HI EVAP TEMP BIN FULL POWER...
- Page 78 NEW MXG SERIES START UP AND OPERATIONAL CHECKS ..till defrost cycle is elapsed thus to release all ice cubes from inverted mold cups; after that the machine will stop at bin full condition with the yellow LED steady ON PUSH...
- Page 79 NEW MXG SERIES START UP AND OPERATIONAL CHECKS As soon as the ice is removed between transmitter and received the infrared beam is resumed immediately with fast a blinking of the Yellow LED, then the machine restart with 45” of recharging...
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Page 80: Operating Principles
NEW MXG SERIES OPERATING PRINCIPLES COMPONENTS... - Page 81 NEW MXG SERIES OPERATING PRINCIPLES - FREEZE Evaporator Compressor Air cooled valve condenser...
- Page 82 NEW MXG SERIES OPERATING PRINCIPLES - HARVEST Evaporator Compressor Air cooled valve condenser...
- Page 83 NEW MXG SERIES OPERATING PRINCIPLES 938 Liquid valves Liquid valves hot gas valves...
- Page 84 NEW MXG SERIES OPERATING PRINCIPLES 938 valves factory setting, full opening (countercl ockwise then 1 turn clockwise...
- Page 85 NEW MXG SERIES OPERATING PRINCIPLES 938 Evaporator sensor location...
- Page 86 NEW MXG SERIES OPERATING PRINCIPLES 938 Condenser sensor location air cooled version...
- Page 87 NEW MXG SERIES OPERATING PRINCIPLES 938 - FREEZE Condenser SWEP sensor water location cooled water condenser cooled version...
- Page 88 NEW MXG SERIES OPERATING PRINCIPLES 938 DANFOS S water regulating valve set at 17 bar...
- Page 89 NEW MXG SERIES WATER SYSTEM – FREEZING CYCLE...
- Page 90 NEW MXG SERIES WATER SYSTEM – HARVEST CYCLE FIRST PORTION 30”...
- Page 91 NEW MXG SERIES WATER SYSTEM – HARVEST CYCLE SECOND PORTION...
- Page 92 NEW MXG SERIES OPERATING PRINCIPLES – PC BOARD...
- Page 93 NEW MXG SERIES OPERATING PRINCIPLES – DIP SWITCHES SWITCH 9 SWITCH 7 AND 8 SWITCH 5 AND 6 OPERATING TIME EXTENTION TIME OF LENGTH OF THE OF WATER PUMP HARVEST CYCLE BY 0”, 30”, HARVEST CYCLE DURING HARVEST 60” OR WATER PUMP OFF ACCORDING TO THE OFF = 15”...
- Page 94 NEW MXG SERIES OPERATING PRINCIPLES – JUMPERS...
- Page 95 NEW MXG SERIES OPERATING PRINCIPLES – PC BOARD Time T From start up of freezing cycle till the blinking of 0°C Red...
- Page 96 NEW MXG SERIES OPERATING PRINCIPLES – PC BOARD Time T From blinking of Red LED till the light ON steady of -15°C Red LED...
- Page 97 NEW MXG SERIES OPERATING PRINCIPLES – PC BOARD LENGTH OF TIMED PORTION OF FREEZING Time T CYCLE – FIRST 4 SWITCHES Added time controlled by the PC Board 25’ 23’ 21’ according to the setting 17’ 19’ of the DIP SWITCH 15’...
- Page 98 NEW MXG SERIES OPERATING PRINCIPLES – PC BOARD Time T Harvest Time T LENGTH OF HARVEST CYCLE ACCORDING TO THE TIME TO DROP THE EVAP. TEMPERATURE FROM 0ºC TO -13ºC controlled by the PC Board and it is inversely LENGTH...
- Page 99 NEW MXG SERIES OPERATING PRINCIPLES – PC BOARD It’s possible to extend the length of the harvest cycle (T by means of the DIP SWITCH 7 and 8 as per below chart. DIP SWITCH ADDITIONAL DEFROST TIME 30" 60" 90"...
- Page 100 NEW MXG SERIES OPERATING PRINCIPLES – PC BOARD 0°C -15°C Time Time T Time T Freezing = T Defrost/Harvest = T...
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Page 101: Alarm Led
NEW MXG SERIES OPERATING PRINCIPLES – PC BOARD ALARMS TOO HI COND. TEMPERATURE Whenever the >70ºC condensing temperature rise up to 70ºC (air cooled FREEZING CYCLE version) or 60ºC TOO HI COND TEMP TOO HI EVAP TEMP (water cooled version) - Page 102 NEW MXG SERIES OPERATING PRINCIPLES – PC BOARD ALARMS TOO HI EVAPORATOR TEMPERATURE In case the evaporating temperature remains higher then 0ºC after 15 FREEZING CYCLE minutes from the TOO HI COND TEMP beginning of the freezing TOO HI EVAP TEMP...
- Page 103 NEW MXG SERIES OPERATING PRINCIPLES – PC BOARD ALARMS CONDENSER SENSOR OUT OF ORDER In case both the Red and Yellow LED are light ON FREEZING CYCLE steady TOO HI COND TEMP condenser TOO HI EVAP TEMP sensor is out of...
- Page 104 NEW MXG SERIES OPERATING PRINCIPLES – PC BOARD ALARMS EVAPORATOR SENSOR OUT OF ORDER In case both the Red and Yellow LED are blinking FREEZING CYCLE the evaporator sensor is out of TOO HI COND TEMP TOO HI EVAP TEMP...
- Page 105 NEW MXG SERIES OPERATING PRINCIPLES – PC BOARD ALARMS ICE LEVEL CONTROL OUT OF ORDER Whenever red and FREEZING CYCLE yellow LEDs blinks TOO HI COND TEMP TOO HI EVAP TEMP alternatively ice level BIN FULL POWER control is our of order...
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Page 106: Ice Level Control
NEW MXG SERIES OPERATING PRINCIPLES – PC BOARD ALARMS ICE LEVEL CONTROL CALIBRATION Three LED flash : FREEZING CYCLE ice level control – TOO HI COND TEMP PCB balance / TOO HI EVAP TEMP BIN FULL calibration done POWER... - Page 107 NEW MXG SERIES OPERATING PRINCIPLES – PC BOARD ALARMS CLEANING – MISSING TEST JUMPER Three LEDs blinking: unit in FREEZING CYCLE cleaning cycle or missing TOO HI COND TEMP TOO HI EVAP TEMP BIN FULL test jumper removal POWER...
- Page 108 NEW MXG SERIES OPERATING PRINCIPLES – PC BOARD ALARMS START UP DELAY Yellow LED blinking at unit start up with ice PUSH maker OFF: FREEZING CYCLE 60’ delay – Jumper J3 TOO HI COND TEMP TOO HI EVAP TEMP OPEN...
- Page 109 NEW MXG SERIES COMPONENTS - REFRIGERANT SYSTEM The components of the refrigerant system of the MC Series are composed by: • COMPRESSOR...
- Page 110 NEW MXG SERIES COMPONENTS - REFRIGERANT SYSTEM • AIR COOLED CONDENSER...
- Page 111 NEW MXG SERIES COMPONENTS - REFRIGERANT SYSTEM • EVAPORATOR...
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Page 112: Capillary Tube
NEW MXG SERIES COMPONENTS - REFRIGERANT SYSTEM • SUCTION LINE AND CAPILLARY TUBE... - Page 113 NEW MXG SERIES COMPONENTS - REFRIGERANT SYSTEM • DRIER...
- Page 114 NEW MXG SERIES COMPONENTS - REFRIGERANT SYSTEM • HOT GAS VALVE...
- Page 115 NEW MXG SERIES COMPONENTS - WATER SYSTEM The components of the water system of the MC Series are composed by: • WATER INLET VALVE...
- Page 116 NEW MXG SERIES COMPONENTS - WATER SYSTEM • WATER SUMP...
- Page 117 NEW MXG SERIES COMPONENTS - WATER SYSTEM • WATER PUMP...
- Page 118 NEW MXG SERIES COMPONENTS - WATER SYSTEM • SPRAY BAR...
- Page 119 NEW MXG SERIES COMPONENTS - WATER SYSTEM • OVERFLOW...
- Page 120 NEW MXG SERIES COMPONENTS - WATER SYSTEM • WATER DRAIN VALVE...
- Page 121 NEW MXG SERIES COMPONENTS - ELECTRICAL CONTROLS The components of the Electric System of the MXG Series are composed by: • MASTER SWICH...
- Page 122 NEW MXG SERIES COMPONENTS - ELECTRICAL CONTROLS • PC BOARD...
- Page 123 NEW MXG SERIES COMPONENTS - ELECTRICAL CONTROLS • EVAPORATOR SENSOR...
- Page 124 NEW MXG SERIES COMPONENTS - ELECTRICAL CONTROLS • CONDENSER SENSOR...
- Page 125 NEW MXG SERIES COMPONENTS - ELECTRICAL CONTROLS • OPTICAL ICE LEVEL CONTROL...
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Page 126: Maintenance
NEW MXG SERIES MAINTENANCE... - Page 127 NEW MXG SERIES MAINTENANCE MXG series are equipped by a special built in countdown timer which advise about elapsed time which remind for cleaning. The time between cleaning/de-scaling can be changed according with the setting of the FIRST Jumper on the...
- Page 128 NEW MXG SERIES MAINTENANCE The most important program on the maintenance of the cubers is the cleaning/sanitizing to be done on regular base, as detailed here below: • Sanitizing: Every month • Cleaning: Every six or when cleaning remind board signals it.
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Page 129: Tools Required
NEW MXG SERIES MAINTENANCE TOOLS REQUIRED • Medium Phillips Screwdriver • Medium Flat Screwdriver • Pair of safety gloves • Bucket • Different types of brush • Approved Cleaner/Sanitizer... - Page 130 NEW MXG SERIES MAINTENANCE Wait till the end of the defrost/harvest cycle then Switch OFF the machine Remove all frame panels...
- Page 131 NEW MXG SERIES MAINTENANCE Scoop out all ice cubes ….flush out the water from the stored into the bin so to sump reservoir by bending prevent its contamination down the drain tube. then...
- Page 132 NEW MXG SERIES MAINTENANCE Prepare the cleaning solution by diluting in a plastic bucket three liters of lukewarm water (max 40ºC) with 300 ml of SCOTSMAN Ice Machine Cleaner.
- Page 133 NEW MXG SERIES MAINTENANCE Remove the evaporator ….slowly pour onto the cover then…. evaporator the cleaning solution.
- Page 134 NEW MXG SERIES MAINTENANCE With the help of a brush dissolve the most resistant and remote scale deposits in the plastic platen.
- Page 135 NEW MXG SERIES MAINTENANCE Switch ON the machine at Master Switch.
- Page 136 NEW MXG SERIES MAINTENANCE During the Water FREEZING CYCLE Filling Phase push TOO HI COND TEMP the Re-Set button TOO HI EVAP TEMP BIN FULL between 2 and 5”. POWER...
- Page 137 NEW MXG SERIES MAINTENANCE The machine FREEZING CYCLE enter in Cleaning TOO HI COND TEMP Mode with the first TOO HI EVAP TEMP BIN FULL three LED POWER blinking.
- Page 138 NEW MXG SERIES MAINTENANCE With the water pump in operation the cleaning solution in kept in circulation through the entire water system.
- Page 139 NEW MXG SERIES MAINTENANCE Let the unit remain in the cleaning mode FREEZING CYCLE for about 20 minutes then push again the TOO HI COND TEMP TOO HI EVAP TEMP Re-Set button BIN FULL between 2 and 5”, to POWER...
- Page 140 NEW MXG SERIES MAINTENANCE Switch OFF the ice maker...
- Page 141 NEW MXG SERIES MAINTENANCE Flush out the cleaning … pour onto the evaporator solution from the sump by cavity three liters of fresh water bending down the drain tube to rinse the molds and the …. platen.
- Page 142 NEW MXG SERIES MAINTENANCE Switch ON again Do it twice the machine and so to be sure no more push the PC trace of Board Push descaling/ Button between 2 cleaning & 5”. solution The water pump is remains into again in operation the sump.
- Page 143 NEW MXG SERIES MAINTENANCE Pour on the upper side of …. turn again the machine in the evaporator 2 liters of cleaning mode for 10 minutes fresh water with 10-15 drops so to sanitize all the water of Scotsman Antialgae system.
- Page 144 NEW MXG SERIES MAINTENANCE Place again the At completion of the freezing and evaporator cover harvest cycle make sure of proper and the service texture and clearness of the ice cubes panels previously and that they do not have any acid removed.
- Page 145 NEW MXG SERIES MAINTENANCE Wipe clean and rinse the inner surface of the storage bin. REMEMBER. To prevent the accumulation of undesirable bacteria it is necessary to sanitize the interior of the storage bin with a sanitizing solution every week.
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Page 146: Service Analysis
NEW MXG SERIES SERVICE ANALYSIS... - Page 147 NEW MXG SERIES SERVICE ANALYSIS All the machines of the AC Series are now supplied with a label showing the different meanings of the LEDs so to help the Service Technician in the right diagnosis of the possible malfunction of the machine.
- Page 148 NEW MXG SERIES SERVICE ANALYSIS This is a Scotsman Ice Cube. It must be clear, solid with a small depression on its bottom rim of about 3-4 mm.
- Page 149 NEW MXG SERIES SERVICE ANALYSIS This ice cube is clear, solid but it has a deep depression on its bottom rim due to a too short freezing cycle. It is necessary to extend the length of the freezing cycle by changing the setting of DIP SWITCH 1, 2, 3 and 4.
- Page 150 NEW MXG SERIES SERVICE ANALYSIS Check first the combination of the DIP SWICH 1, 2, 3 and 4. Check on the chart the relating length of the Ta min. freezing cycle controlled by the PC Board Timer.
- Page 151 NEW MXG SERIES SERVICE ANALYSIS For a longer freezing Ta min. cycle change the combination of the DIP SWITCH from 9 to 11 minutes. New combination for 11 minutes Time Ta is: OFF-ON-OFF-ON...
- Page 152 NEW MXG SERIES SERVICE ANALYSIS This ice cube is clear, solid but it is very thin with a very big depression on its bottom rim due to a very short freezing cycle. In this situation may be the PC Board by-passed the first two...
- Page 153 NEW MXG SERIES SERVICE ANALYSIS Looking the PC Board the Red LEDs -15ºC is probably lighted ON immediately at start up of freezing cycle. solution is to replace evaporator sensor with a new one.
- Page 154 NEW MXG SERIES SERVICE ANALYSIS This is a typical ice cube clear on its upper left side and white and corroded on its bottom right side. The reason is that the water doesn’t reach in correctly the inside of some of the tin cooper...
- Page 155 NEW MXG SERIES SERVICE ANALYSIS Probably one or more of the spray jets of the spray bar are partially looked by scale/dirt and the water is no longer sprayed as a complete inverted water cone.
- Page 156 NEW MXG SERIES SERVICE ANALYSIS To overcame the problem it is necessary first to remove from the inside of the evaporator chamber/sump the spray bar and its S.S. trust washer….
- Page 157 NEW MXG SERIES SERVICE ANALYSIS ….then dump into a cleaning/de- scaling solution to remove any possible scale formation from the inside…...
- Page 158 NEW MXG SERIES SERVICE ANALYSIS Re-fit first the trust washer and the spray bar paying attention that the jet holes face up.
- Page 159 NEW MXG SERIES SERVICE ANALYSIS This is a typical ice cube; clear on its upper side and white and corroded on its bottom side. The water is sprayed in the correct way and under the right pressure only during the first...
- Page 160 NEW MXG SERIES SERVICE ANALYSIS...
- Page 161 NEW MXG SERIES SERVICE ANALYSIS The reason is the too low water level into the sump during the harvest cycle that could be related to: • Too low water inlet pressure...
- Page 162 NEW MXG SERIES SERVICE ANALYSIS • Clogged water filter...
- Page 163 NEW MXG SERIES SERVICE ANALYSIS • Clogged water inlet strainer...
- Page 164 NEW MXG SERIES SERVICE ANALYSIS • Clogged water flow control...
- Page 165 NEW MXG SERIES SERVICE ANALYSIS • Water leak through the water drain valve...
- Page 166 NEW MXG SERIES SERVICE ANALYSIS This ice cube is clear, solid but it is oversized. It is necessary to reduce the length of the freezing cycle by changing the setting of DIP SWITCH 1, 2, 3 and 4.
- Page 167 NEW MXG SERIES SERVICE ANALYSIS Check first the combination of the DIP SWICH 1, 2, 3 and 4. Check on the chart the relating length of the freezing cycle Ta min. controlled by the PC Board Timer.
- Page 168 NEW MXG SERIES SERVICE ANALYSIS For a shorter freezing Ta min. cycle change the combination of the DIP SWITCH from 13 to 9 minutes. New combination for 9 minutes Time Ta is: ON-ON-OFF-ON...
- Page 169 NEW MXG SERIES SERVICE ANALYSIS These ice cubes are both clear, solid but some are oversized and some other are undersized. If so the possible reason is an incorrect charge of refrigerant in the system (too low).
- Page 170 NEW MXG SERIES SERVICE ANALYSIS Looking the upper side of the evaporator after 15- 20 minutes in the freeze the serpentine is properly frosted mainly on the first portion of the same (inlet of refrigerant) while on the second portion...
- Page 171 NEW MXG SERIES SERVICE ANALYSIS...
- Page 172 NEW MXG SERIES SERVICE ANALYSIS ICE LEVEL SENSOR OUT OF ORDER Whenever yellow and red FREEZING CYCLE LED blink alternately ice TOO HI COND TEMP TOO HI EVAP TEMP BIN FULL level control is out of order POWER and must be replaced...
- Page 173 NEW MXG SERIES SERVICE ANALYSIS ICE LEVEL SENSOR OUT OF ORDER This new Electronic PC Board is no longer equipped with the trimmer used to adjust the I/R beam. The PC Board can now perform the I/R calibration/adjustment through the following...
- Page 174 NEW MXG SERIES SERVICE ANALYSIS ICE LEVEL SENSOR OUT OF ORDER • Be assured that either ice level sensor lenses tx & rx are cleaned without any scale • Turn the unit OFF by main switch.
- Page 175 NEW MXG SERIES SERVICE ANALYSIS ICE LEVEL SENSOR OUT OF ORDER • Push and keep on pushing reset button. • While keeping reset button pushing turn the unit ON by green switch...
- Page 176 NEW MXG SERIES SERVICE ANALYSIS ICE LEVEL SENSOR OUT OF ORDER • Wait few second then all thise LEDs will flash at once FREEZING CYCLE TOO HI COND TEMP TOO HI EVAP TEMP • Release reset BIN FULL button, calibration is...
- Page 177 NEW MXG SERIES SERVICE ANALYSIS ICE LEVEL SENSOR OUT OF ORDER This calibration should take place whenever needed or required anyhow MUST be followed anytime pcb and / or ice level sensor is replaced...
- Page 178 NEW MXG SERIES SERVICE ANALYSIS The unit is OFF with the Red LED of PC Board steady. FREEZING CYCLE The reason is a TOO HI COND TEMP too high TOO HI EVAP TEMP condensing BIN FULL temperature (>70ºC on air...
- Page 179 NEW MXG SERIES SERVICE ANALYSIS • Fan Motor (air cooled version) inoperative...
- Page 180 NEW MXG SERIES SERVICE ANALYSIS • Dirty condenser...
- Page 181 NEW MXG SERIES SERVICE ANALYSIS •Too high room temperature...
- Page 182 NEW MXG SERIES SERVICE ANALYSIS • No water to water cooled condenser CLOSED...
- Page 183 NEW MXG SERIES SERVICE ANALYSIS • Condenser sensor inoperative...
- Page 184 NEW MXG SERIES SERVICE ANALYSIS Fan motor (air cooled version) inoperative Check during freezing cycle for: • Overheating of the fan motor during its operation...
- Page 185 NEW MXG SERIES SERVICE ANALYSIS No water to the water cooled condenser (water cooled version) Check during freezing cycle for: Correct operation of the water regulating valve Set-up at 17 bar...
- Page 186 NEW MXG SERIES SERVICE ANALYSIS The unit is OFF with the Red LED of PC Board blinking. FREEZING CYCLE The reason is a TOO HI COND TEMP TOO HI EVAP TEMP too high evaporating BIN FULL temperature POWER after 15 minutes...
- Page 187 NEW MXG SERIES SERVICE ANALYSIS The possible reasons are: • No power out from the PC Board to electrical components • No power out to compressor • Compressor not working • Compressor looses its efficiency • Short or no refrigerant in the system •...
- Page 188 NEW MXG SERIES SERVICE ANALYSIS Compressor looses its efficiency: Check during freezing cycle for: • Too low Discharge pressure of refrigerant system...
- Page 189 NEW MXG SERIES SERVICE ANALYSIS Compressor looses its efficiency: Check during freezing cycle for: •Too hi Suction pressure of refrigerant system...
- Page 190 NEW MXG SERIES SERVICE ANALYSIS Short or no refrigerant in the system Check during freezing cycle for: • Too low Discharge pressure of refrigerant system...
- Page 191 NEW MXG SERIES SERVICE ANALYSIS Short or no refrigerant in the system Check during freezing cycle for: •Too low Suction pressure of refrigerant system...
- Page 192 NEW MXG SERIES SERVICE ANALYSIS Short or no refrigerant in the system Check during freezing cycle for: • Proper frost of the evaporator serpentine...
- Page 193 NEW MXG SERIES SERVICE ANALYSIS Leaking of refrigerant through the hot gas valve Check during freezing cycle for: • Too hi temperature of evaporator serpentine...
- Page 194 NEW MXG SERIES SERVICE ANALYSIS Leaking of refrigerant through the hot gas valve Check during freezing cycle for: • Very poor frost of the evaporator serpentine...
- Page 195 NEW MXG SERIES SERVICE ANALYSIS Leaking of refrigerant through the hot gas valve Check during freezing cycle for: •Too high Suction pressure...
- Page 196 NEW MXG SERIES SERVICE ANALYSIS Leaking of water through the water inlet valve Check during freezing cycle for: • Water flowing through the water inlet tube...
- Page 197 NEW MXG SERIES SERVICE ANALYSIS The unit is OFF with both the Red and Yellow LEDs of FREEZING CYCLE PC Board TOO HI COND TEMP TOO HI EVAP TEMP steady. BIN FULL The reason is the Condenser Sensor POWER OUT OF ORDER.
- Page 198 NEW MXG SERIES SERVICE ANALYSIS The unit is OFF with both the Red and Yellow LEDs of FREEZING CYCLE PC Board TOO HI COND TEMP TOO HI EVAP TEMP blinking. BIN FULL The reason is the Evaporator Sensor POWER OUT OF ORDER.
- Page 199 NEW MXG SERIES...