Scotsman MXG 328 A/W Technical Service Training Download Page 32

Page: 32 / 199

Level the unit on

both directions front

to rear and right to

left side using the

adjustable legs.

STACKING INSTALLATION

NEW MXG SERIES

Summary of Contents for MXG 328 A/W

Page 1: ...TECHNICAL SERVICE TRAINING Welcome to another Scotsman technical service presentation This one will cover the electronic MXG series Ice Cube Machines MXG SERIES CUBERS MXG SERIES...

Page 2: ...MXG 328 A W Max Ice Production 150 Kg 24h 10 10 C Air Water Inlet Temperature NEW MXG SERIES...

Page 3: ...MXG 428 A W Max Ice Production 195 Kg 24h 10 10 C Air Water Inlet Temperature NEW MXG SERIES...

Page 4: ...MXG 438 A W Max Ice Production 195 Kg 24h 10 10 C Air Water Inlet Temperature NEW MXG SERIES...

Page 5: ...MXG 638 A W Max Ice Production 340 Kg 24h 10 10 C Air Water Inlet Temperature NEW MXG SERIES...

Page 6: ...MXG 938 A W Max Ice Production 400 Kg 24h 10 10 C Air Water Inlet Temperature NEW MXG SERIES...

Page 7: ...S 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 NEW MXG S...

Page 8: ...UNPACKING NEW MXG SERIES...

Page 9: ...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 then the carton box...

Page 10: ...Slip away remove plastic strip UNPACKING NEW MXG SERIES...

Page 11: ...Remove front panel air filter AC version only UNPACKING NEW MXG SERIES...

Page 12: ...Remove front panel screws and the panel UNPACKING NEW MXG SERIES...

Page 13: ...Remove top panel screws and the panel UNPACKING NEW MXG SERIES...

Page 14: ...Remove I R bracket installation instruction and water inlet and outlet hoses UNPACKING NEW MXG SERIES...

Page 15: ...Remove side panels screws and the panels UNPACKING NEW MXG SERIES...

Page 16: ...UNPACKING NEW MXG SERIES unscrew the unit frame from the wooden base...

Page 17: ...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 UNPACKIN...

Page 18: ...o 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 UNPACKING NEW MXG S...

Page 19: ...INSTALLATION NEW MXG SERIES...

Page 20: ...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 INSTALLATION NEW MXG S...

Page 21: ...Cut the unit base gasket pass the I R sensor through the same reaching the inner bin area INSTALLATION NEW MXG SERIES...

Page 22: ...Fix the IR by supplied screws to related bracket INSTALLATION NEW MXG SERIES...

Page 23: ...Fix IR bracket at ice chute discharge area by stainless steel screw INSTALLATION NEW MXG SERIES...

Page 24: ...Once installed optical level sensor re install ice chute previously removed paying attention to hang the same to its hook rim point INSTALLATION NEW MXG SERIES...

Page 25: ...Note different location according to MXG models INSTALLATION NEW MXG SERIES MXG 328 428 438 938 MXG 638...

Page 26: ...ck 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 INSTALLATION NEW MXG SER...

Page 27: ...ditions that should be Min ambient temperature 10 C 50F Max ambient temperature 40 C 100F Min water temperature 5 C 40F Max water temperature 35 C 90F Min water pressure 1 bar 14 PSI Max water pressur...

Page 28: ...te 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 INSTALLATION NEW MXG SERIES Min space...

Page 29: ...NEW MXG SERIES Air filter Air filter INSTALLATION 328 428 438 air flow...

Page 30: ...NEW MXG SERIES Air filter INSTALLATION 638 air flow Air filter...

Page 31: ...NEW MXG SERIES Air filter Air filter INSTALLATION 938 air flow...

Page 32: ...Level the unit on both directions front to rear and right to left side using the adjustable legs STACKING INSTALLATION NEW MXG SERIES...

Page 33: ...upply 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 INSTALLATION ELEC...

Page 34: ...upply line by means of the rubber hose provided with machine Install on water supply line closed to the machine a water valve tap Connect the 20 mm O D fitting of the water drain with the flexible hos...

Page 35: ...AIR COOLED VERSION TYPICAL INSTALLATION NEW MXG SERIES POWER WATER INLET WATER DRAIN HAND DISCONNECT SWITCH WATER FILTER WATER VALVE WATER DRAIN...

Page 36: ...On the water cooled version there are two separate 3 4 male thread water inlet fittings INSTALLATION NEW MXG SERIES...

Page 37: ...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 INSTALLATION NEW MXG SERIES...

Page 38: ...WATER COOLED VERSION TYPICAL INSTALLATION NEW MXG SERIES POWER WATER INLET WATER DRAIN HAND DISCONNECT SWITCH WATER FILTER WATER VALVE WATER DRAIN...

Page 39: ...START UP AND OPERATIONAL CHECKS NEW MXG SERIES...

Page 40: ...Open the water tap valve and Switch ON the power on the electrical supply line START UP AND OPERATIONAL CHECKS NEW MXG SERIES...

Page 41: ...Green Lighted Master Push Switch located in the front panel By pushing it is possible to Switch ON and OFF the machine NEW MXG SERIES START UP AND OPERATIONAL CHECKS...

Page 42: ...Push the Green Push Button Switch to Start Up the machine START UP AND OPERATIONAL CHECKS NEW MXG SERIES...

Page 43: ...on the models MXG 638 938 with the Yellow LED blinking This delay can be set up with the Jumper n 3 Jump IN 0 Jump OUT 60 FREEZING CYCLE BIN FULL POWER TOO HI EVAP TEMP TOO HI COND TEMP PUSH START UP...

Page 44: ...START UP AND OPERATIONAL CHECKS NEW MXG SERIES Once the start delay is elapsed the Ice Machine will start up automatically through the 5 minutes of Water Filling Phase...

Page 45: ...The components energized during this period are PC Board START UP AND OPERATIONAL CHECKS NEW MXG SERIES...

Page 46: ...Water Inlet Solenoid Valve START UP AND OPERATIONAL CHECKS NEW MXG SERIES...

Page 47: ...Water drain valve START UP AND OPERATIONAL CHECKS NEW MXG SERIES...

Page 48: ...Hot Gas Solenoid Valve START UP AND OPERATIONAL CHECKS NEW MXG SERIES...

Page 49: ...ring the first 5 the water goes through the Water Inlet Valve then flows into the small orifice of the Flow Control located on the outlet port of the same START UP AND OPERATIONAL CHECKS NEW MXG SERIE...

Page 50: ...let hose the incoming water arrive on the upper side of the evaporator where it flows onto the plastic evaporator platen dribbling down through the holes located on the corners START UP AND OPERATIONA...

Page 51: ...bbled 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 START UP AND OPERATIONAL CHECKS NEW MXG SER...

Page 52: ...START UP AND OPERATIONAL CHECKS NEW MXGSERIES Once the start delay is elapsed the Ice Machine will start up automatically through the 5 minutes of Water Filling Phase...

Page 53: ...er the first 5 of water filling phase the machine start up automatically on freezing cycle with the following electrical components in operation Compressor START UP AND OPERATIONAL CHECKS NEW MXG SERI...

Page 54: ...Water Pump START UP AND OPERATIONAL CHECKS NEW MXG SERIES...

Page 55: ...Fan Motor on air cooled version only START UP AND OPERATIONAL CHECKS NEW MXG SERIES...

Page 56: ...Contactor START UP AND OPERATIONAL CHECKS NEW MXG SERIES...

Page 57: ...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 so to keep between two pre set values the condenser temperature...

Page 58: ...On PC Board the LED energized are Power FREEZING CYCLE BIN FULL POWER TOO HI EVAP TEMP TOO HI COND TEMP PUSH START UP AND OPERATIONAL CHECKS NEW MXG SERIES...

Page 59: ...On PC Board the LED energized are Power Freezing FREEZING CYCLE BIN FULL POWER TOO HI EVAP TEMP TOO HI COND TEMP PUSH START UP AND OPERATIONAL CHECKS NEW MXG SERIES...

Page 60: ...Water is circulating by the water pump into the inverted tin plated copper molds of the evaporator START UP AND OPERATIONAL CHECKS NEW MXG SERIES...

Page 61: ...while the refrigerant is flowing into the serpentine welded on the upper side of the tin plated copper molds START UP AND OPERATIONAL CHECKS NEW MXG SERIES...

Page 62: ...EVAPORATOR SENSOR NEW MXG SERIES...

Page 63: ...After approximately 5 minutes since the start up of the freezing cycle the temperature of the evaporator serpentine drops down to 0 C START UP AND OPERATIONAL CHECKS NEW MXG SERIES 0 C...

Page 64: ...with the blinking of the small RED LED located in the center of PC Board START UP AND OPERATIONAL CHECKS NEW MXG SERIES...

Page 65: ...After approximately 10 minutes from the start up of the freezing cycle the temperature of the evaporator serpentine drops down to 15 C START UP AND OPERATIONAL CHECKS NEW MXG SERIES 15 C...

Page 66: ...with the light ON steady of the small RED LED located in the center of PC Board START UP AND OPERATIONAL CHECKS NEW MXG SERIES...

Page 67: ...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 START UP AND OPERATIONAL CHECKS NEW MXG SERIES...

Page 68: ...START UP AND OPERATIONAL CHECKS NEW MXG SERIES...

Page 69: ...Once completed the freezing cycle the machine enters into the defrost or harvest cycle with the following electrical components in operation Compressor START UP AND OPERATIONAL CHECKS NEW MXG SERIES...

Page 70: ...Water Inlet Solenoid valve START UP AND OPERATIONAL CHECKS NEW MXG SERIES...

Page 71: ...Water Drain Solenoid Valve START UP AND OPERATIONAL CHECKS NEW MXG SERIES...

Page 72: ...Hot Gas Valve START UP AND OPERATIONAL CHECKS NEW MXG SERIES...

Page 73: ...ure from 0 C to 15 C time T2 as shown on the table A SWITCH 5 AND 6 D B C START UP AND OPERATIONAL CHECKS NEW MXG SERIES LENGTH OF HARVEST CYCLE ACCORDING TO THE TIME TO DROP THE EVAP TEMPERATURE FROM...

Page 74: ...he length of the defrost cycle by means of the DIP SWITCH 7 and 8 as per below chart ADDITIONAL DEFROST TIME 7 8 ON ON 0 OFF ON 30 ON OFF 60 OFF OFF 90 DIP SWITCH START UP AND OPERATIONAL CHECKS WATER...

Page 75: ...d 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 molts with the dropping down of the same through the curtain...

Page 76: ...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 a defrost START UP AND OPERATIONAL CHECKS NEW MX...

Page 77: ...The Bin Full YELLOW LED starts to blink slow FREEZING CYCLE BIN FULL POWER TOO HI EVAP TEMP TOO HI COND TEMP PUSH START UP AND OPERATIONAL CHECKS NEW MXG SERIES...

Page 78: ...ase all ice cubes from inverted mold cups after that the machine will stop at bin full condition with the yellow LED steady ON FREEZING CYCLE BIN FULL POWER TOO HI EVAP TEMP TOO HI COND TEMP PUSH STAR...

Page 79: ...ceived the infrared beam is resumed immediately with fast a blinking of the Yellow LED then the machine restart with 45 of recharging water FREEZING CYCLE BIN FULL POWER TOO HI EVAP TEMP TOO HI COND T...

Page 80: ...OPERATING PRINCIPLES and COMPONENTS NEW MXG SERIES...

Page 81: ...Compressor Evaporator Air cooled condenser Hot gas valve OPERATING PRINCIPLES FREEZE NEW MXG SERIES...

Page 82: ...Compressor Evaporator Air cooled condenser Hot gas valve OPERATING PRINCIPLES HARVEST NEW MXG SERIES...

Page 83: ...OPERATING PRINCIPLES 938 NEW MXG SERIES Liquid valves Liquid valves hot gas valves...

Page 84: ...TXV valves factory setting full opening countercl ockwise then 1 turn clockwise OPERATING PRINCIPLES 938 NEW MXG SERIES...

Page 85: ...OPERATING PRINCIPLES 938 NEW MXG SERIES Evaporator sensor location...

Page 86: ...OPERATING PRINCIPLES 938 NEW MXG SERIES Condenser sensor location air cooled version...

Page 87: ...OPERATING PRINCIPLES 938 FREEZE NEW MXG SERIES Condenser sensor location water cooled version SWEP water cooled condenser...

Page 88: ...OPERATING PRINCIPLES 938 NEW MXG SERIES DANFOS S water regulating valve set at 17 bar...

Page 89: ...WATER SYSTEM FREEZING CYCLE NEW MXG SERIES...

Page 90: ...WATER SYSTEM HARVEST CYCLE FIRST PORTION 30 NEW MXG SERIES...

Page 91: ...WATER SYSTEM HARVEST CYCLE SECOND PORTION NEW MXG SERIES...

Page 92: ...OPERATING PRINCIPLES PC BOARD NEW MXG SERIES...

Page 93: ...RVEST CYCLE BY 0 30 60 OR WATER PUMP OFF SWITCH 5 AND 6 LENGTH OF THE HARVEST CYCLE ACCORDING TO THE TIME T2 SWITCH 1 2 3 AND 4 SETTING OF THE TIMED PORTION OF FREEZING CYCLE SWITCH 10 CONDENSER SAFET...

Page 94: ...OPERATING PRINCIPLES JUMPERS NEW MXG SERIES...

Page 95: ...Time T1 From start up of freezing cycle till the blinking of 0 C Red LED OPERATING PRINCIPLES PC BOARD NEW MXG SERIES...

Page 96: ...Time T2 From blinking of Red LED till the light ON steady of 15 C Red LED OPERATING PRINCIPLES PC BOARD NEW MXG SERIES...

Page 97: ...controlled by the PC Board according to the setting of the DIP SWITCH 1 2 3 and 4 LENGTH OF TIMED PORTION OF FREEZING CYCLE FIRST 4 SWITCHES 25 13 19 11 17 3 9 15 21 23 7 5 OPERATING PRINCIPLES PC BO...

Page 98: ...he Table Time TS is NOT adjustable LENGTH OF HARVEST CYCLE ACCORDING TO THE TIME TO DROP THE EVAP TEMPERATURE FROM 0 C TO 13 C LENGTH PROGRAMS HARVEST CYCLE A B C D 180 Up to 6 Up to 9 165 6 7 Up to 3...

Page 99: ...he length of the harvest cycle Te by means of the DIP SWITCH 7 and 8 as per below chart ADDITIONAL DEFROST TIME 7 8 ON ON 0 OFF ON 30 ON OFF 60 OFF OFF 90 DIP SWITCH OPERATING PRINCIPLES PC BOARD WATE...

Page 100: ...Time Ta Time T1 T2 Time Ts Freezing T1 T2 Ta Defrost Harvest Ts Te 0 C 15 C Te OPERATING PRINCIPLES PC BOARD NEW MXG SERIES...

Page 101: ...r 60 C water cooled version the PC Board will switch OFF immediately the entire machine with the light ON of the Red ALARM LED TOO HI COND TEMPERATURE FREEZING CYCLE BIN FULL POWER TOO HI EVAP TEMP TO...

Page 102: ...the beginning of the freezing cycle the PC Board will switch OFF immediately the entire machine with the blinking of the Red ALARM LED FREEZING CYCLE BIN FULL POWER TOO HI EVAP TEMP TOO HI COND TEMP...

Page 103: ...LED are light ON steady the condenser sensor is out of order and need to be replaced CONDENSER SENSOR OUT OF ORDER OPERATING PRINCIPLES PC BOARD ALARMS FREEZING CYCLE BIN FULL POWER TOO HI EVAP TEMP...

Page 104: ...ow LED are blinking the evaporator sensor is out of order and need to be replaced EVAPORATOR SENSOR OUT OF ORDER OPERATING PRINCIPLES PC BOARD ALARMS FREEZING CYCLE BIN FULL POWER TOO HI EVAP TEMP TOO...

Page 105: ...control is our of order then have to be replaced FREEZING CYCLE BIN FULL POWER TOO HI EVAP TEMP TOO HI COND TEMP FREEZING CYCLE BIN FULL POWER TOO HI EVAP TEMP TOO HI COND TEMP ICE LEVEL CONTROL OUT O...

Page 106: ...e LED flash ice level control PCB balance calibration done FREEZING CYCLE BIN FULL POWER TOO HI EVAP TEMP TOO HI COND TEMP ICE LEVEL CONTROL CALIBRATION OPERATING PRINCIPLES PC BOARD ALARMS NEW MXG SE...

Page 107: ...s blinking unit in cleaning cycle or missing test jumper removal FREEZING CYCLE BIN FULL POWER TOO HI EVAP TEMP TOO HI COND TEMP CLEANING MISSING TEST JUMPER OPERATING PRINCIPLES PC BOARD ALARMS NEW M...

Page 108: ...ED blinking at unit start up with ice maker OFF 60 delay Jumper J3 OPEN FREEZING CYCLE BIN FULL POWER TOO HI EVAP TEMP TOO HI COND TEMP PUSH OPERATING PRINCIPLES PC BOARD ALARMS START UP DELAY NEW MXG...

Page 109: ...COMPONENTS REFRIGERANT SYSTEM The components of the refrigerant system of the MC Series are composed by COMPRESSOR NEW MXG SERIES...

Page 110: ...AIR COOLED CONDENSER COMPONENTS REFRIGERANT SYSTEM NEW MXG SERIES...

Page 111: ...EVAPORATOR COMPONENTS REFRIGERANT SYSTEM NEW MXG SERIES...

Page 112: ...SUCTION LINE AND CAPILLARY TUBE COMPONENTS REFRIGERANT SYSTEM NEW MXG SERIES...

Page 113: ...DRIER COMPONENTS REFRIGERANT SYSTEM NEW MXG SERIES...

Page 114: ...HOT GAS VALVE COMPONENTS REFRIGERANT SYSTEM NEW MXG SERIES...

Page 115: ...The components of the water system of the MC Series are composed by WATER INLET VALVE COMPONENTS WATER SYSTEM NEW MXG SERIES...

Page 116: ...WATER SUMP COMPONENTS WATER SYSTEM NEW MXG SERIES...

Page 117: ...WATER PUMP COMPONENTS WATER SYSTEM NEW MXG SERIES...

Page 118: ...SPRAY BAR COMPONENTS WATER SYSTEM NEW MXG SERIES...

Page 119: ...OVERFLOW COMPONENTS WATER SYSTEM NEW MXG SERIES...

Page 120: ...WATER DRAIN VALVE COMPONENTS WATER SYSTEM NEW MXG SERIES...

Page 121: ...COMPONENTS ELECTRICAL CONTROLS The components of the Electric System of the MXG Series are composed by MASTER SWICH NEW MXG SERIES...

Page 122: ...PC BOARD COMPONENTS ELECTRICAL CONTROLS NEW MXG SERIES...

Page 123: ...EVAPORATOR SENSOR COMPONENTS ELECTRICAL CONTROLS NEW MXG SERIES...

Page 124: ...CONDENSER SENSOR COMPONENTS ELECTRICAL CONTROLS NEW MXG SERIES...

Page 125: ...OPTICAL ICE LEVEL CONTROL COMPONENTS ELECTRICAL CONTROLS NEW MXG SERIES...

Page 126: ...NEW MXG SERIES MAINTENANCE...

Page 127: ...ACT OUVERTE 12 MOIS RICHIAMO PULIZIA SISTEMA IDRICO CONTATTO CHIUSO 6 MESI CONTATTO APERTO 12 MESI AC EC MODELS JUMP IN AC SERIES JUMP OUT EC SERIES MODELES AC EC CONTACT FERME SERIES AC CONTACT OUVER...

Page 128: ...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 On next slides will be shown the proced...

Page 129: ...TOOLS REQUIRED Medium Phillips Screwdriver Medium Flat Screwdriver Pair of safety gloves Bucket Different types of brush Approved Cleaner Sanitizer NEW MXG SERIES MAINTENANCE...

Page 130: ...Wait till the end of the defrost harvest cycle then Switch OFF the machine Remove all frame panels NEW MXG SERIES MAINTENANCE OFF...

Page 131: ...Scoop out all ice cubes stored into the bin so to prevent its contamination then flush out the water from the sump reservoir by bending down the drain tube NEW MXG SERIES MAINTENANCE...

Page 132: ...Prepare the cleaning solution by diluting in a plastic bucket three liters of lukewarm water max 40 C with 300 ml of SCOTSMAN Ice Machine Cleaner NEW MXG SERIES MAINTENANCE...

Page 133: ...Remove the evaporator cover then slowly pour onto the evaporator the cleaning solution NEW MXG SERIES MAINTENANCE...

Page 134: ...With the help of a brush dissolve the most resistant and remote scale deposits in the plastic platen NEW MXG SERIES MAINTENANCE...

Page 135: ...Switch ON the machine at Master Switch NEW MXG SERIES MAINTENANCE ON...

Page 136: ...During the Water Filling Phase push the Re Set button between 2 and 5 FREEZING CYCLE BIN FULL POWER TOO HI EVAP TEMP TOO HI COND TEMP NEW MXG SERIES MAINTENANCE...

Page 137: ...The machine enter in Cleaning Mode with the first three LED blinking FREEZING CYCLE BIN FULL POWER TOO HI EVAP TEMP TOO HI COND TEMP NEW MXG SERIES MAINTENANCE...

Page 138: ...NEW MXG SERIES With the water pump in operation the cleaning solution in kept in circulation through the entire water system MAINTENANCE...

Page 139: ...cleaning mode for about 20 minutes then push again the Re Set button between 2 and 5 to move back the machine in the Water Filling Phase FREEZING CYCLE BIN FULL POWER TOO HI EVAP TEMP TOO HI COND TEMP...

Page 140: ...Switch OFF the ice maker NEW MXG SERIES MAINTENANCE OFF...

Page 141: ...Flush out the cleaning solution from the sump by bending down the drain tube pour onto the evaporator cavity three liters of fresh water to rinse the molds and the platen NEW MXG SERIES MAINTENANCE...

Page 142: ...PC Board Push Button between 2 5 The water pump is again in operation to circulate the water so to rinse the water system Do it twice so to be sure no more trace of descaling cleaning solution remains...

Page 143: ...th 10 15 drops of Scotsman Antialgae Solution then turn again the machine in cleaning mode for 10 minutes so to sanitize all the water system NOTE Do not mix delimer with sanitizing solution to avoid...

Page 144: ...harvest cycle make sure of proper texture 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 acid taste melt them immedi...

Page 145: ...he 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 NEW M...

Page 146: ...NEW MXG SERIES SERVICE ANALYSIS...

Page 147: ...s 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 The labe...

Page 148: ...This is a Scotsman Ice Cube It must be clear solid with a small depression on its bottom rim of about 3 4 mm NEW MXG SERIES SERVICE ANALYSIS...

Page 149: ...lid 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 NEW MX...

Page 150: ...the DIP SWICH 1 2 3 and 4 1 2 3 4 Ta min OFF OFF ON ON 7 ON ON OFF ON 9 OFF ON OFF ON 11 ON OFF OFF ON 13 Check on the chart the relating length of the freezing cycle controlled by the PC Board Timer...

Page 151: ...hange the combination of the DIP SWITCH from 9 to 11 minutes New combination for 11 minutes Time Ta is OFF ON OFF ON 1 2 3 4 Ta min OFF OFF ON ON 7 ON ON OFF ON 9 OFF ON OFF ON 11 ON OFF OFF ON 13 NEW...

Page 152: ...h 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 portions of the freezing cycle Time T1 T2 due to a inoperativ...

Page 153: ...Looking the PC Board the Red LEDs 15 C is probably lighted ON immediately at start up of freezing cycle The solution is to replace the evaporator sensor with a new one NEW MXG SERIES SERVICE ANALYSIS...

Page 154: ...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 molds NEW MXG SERIES...

Page 155: ...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 NEW MXG SERIES SERVICE ANALYSIS...

Page 156: ...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 NEW MXG SERIES SERVICE ANALYSIS...

Page 157: ...then dump into a cleaning de scaling solution to remove any possible scale formation from the inside NEW MXG SERIES SERVICE ANALYSIS...

Page 158: ...Re fit first the trust washer and the spray bar paying attention that the jet holes face up NEW MXG SERIES SERVICE ANALYSIS...

Page 159: ...side The water is sprayed in the correct way and under the right pressure only during the first portion of the freezing cycle while on the second half the level of the water in the sump is not enough...

Page 160: ...NEW MXG SERIES SERVICE ANALYSIS...

Page 161: ...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 NEW MXG SERIES SERVICE ANALYSIS...

Page 162: ...Clogged water filter NEW MXG SERIES SERVICE ANALYSIS...

Page 163: ...Clogged water inlet strainer NEW MXG SERIES SERVICE ANALYSIS...

Page 164: ...Clogged water flow control NEW MXG SERIES SERVICE ANALYSIS...

Page 165: ...Water leak through the water drain valve NEW MXG SERIES SERVICE ANALYSIS...

Page 166: ...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 NEW MXG SERIES SERVICE ANALYSIS...

Page 167: ...the DIP SWICH 1 2 3 and 4 Check on the chart the relating length of the freezing cycle controlled by the PC Board Timer 1 2 3 4 Ta min OFF OFF ON ON 7 ON ON OFF ON 9 OFF ON OFF ON 11 ON OFF OFF ON 13...

Page 168: ...change the combination of the DIP SWITCH from 13 to 9 minutes New combination for 9 minutes Time Ta is ON ON OFF ON 1 2 3 4 Ta min OFF OFF ON ON 7 ON ON OFF ON 9 OFF ON OFF ON 11 ON OFF OFF ON 13 NEW...

Page 169: ...e 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 NEW MXG SERIES SERVICE ANALY...

Page 170: ...eze the serpentine is properly frosted mainly on the first portion of the same inlet of refrigerant while on the second portion outlet the frost is very thin no exchange of heat between refrigerant al...

Page 171: ...NEW MXG SERIES SERVICE ANALYSIS...

Page 172: ...ice level control is out of order and must be replaced FREEZING CYCLE BIN FULL POWER TOO HI EVAP TEMP TOO HI COND TEMP FREEZING CYCLE BIN FULL POWER TOO HI EVAP TEMP TOO HI COND TEMP ICE LEVEL SENSOR...

Page 173: ...ard 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 procedure NEW MXG SERIES SERVICE ANALYSIS ICE L...

Page 174: ...Be assured that either ice level sensor lenses tx rx are cleaned without any scale Turn the unit OFF by main switch NEW MXG SERIES SERVICE ANALYSIS ICE LEVEL SENSOR OUT OF ORDER OFF...

Page 175: ...Push and keep on pushing reset button While keeping reset button pushing turn the unit ON by green switch NEW MXG SERIES SERVICE ANALYSIS ICE LEVEL SENSOR OUT OF ORDER ON...

Page 176: ...econd then all thise LEDs will flash at once Release reset button calibration is done FREEZING CYCLE BIN FULL POWER TOO HI EVAP TEMP TOO HI COND TEMP NEW MXG SERIES SERVICE ANALYSIS ICE LEVEL SENSOR O...

Page 177: ...This calibration should take place whenever needed or required anyhow MUST be followed anytime pcb and or ice level sensor is replaced NEW MXG SERIES SERVICE ANALYSIS ICE LEVEL SENSOR OUT OF ORDER...

Page 178: ...f PC Board ON steady The reason is a too high condensing temperature 70 C on air cooled version or 60 C on water cooled version caused by FREEZING CYCLE BIN FULL POWER TOO HI EVAP TEMP TOO HI COND TEM...

Page 179: ...Fan Motor air cooled version inoperative NEW MXG SERIES SERVICE ANALYSIS KO...

Page 180: ...Dirty condenser NEW MXG SERIES SERVICE ANALYSIS...

Page 181: ...Too high room temperature NEW MXG SERIES SERVICE ANALYSIS 0 10 70 40 30 20 80 60 50...

Page 182: ...No water to water cooled condenser NEW MXG SERIES SERVICE ANALYSIS CLOSED...

Page 183: ...Condenser sensor inoperative KO NEW MXG SERIES SERVICE ANALYSIS...

Page 184: ...Fan motor air cooled version inoperative Check during freezing cycle for Overheating of the fan motor during its operation 0 10 70 40 30 20 80 60 50 NEW MXG SERIES SERVICE ANALYSIS...

Page 185: ...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 NEW MXG SERIES SERVICE ANALYSIS...

Page 186: ...LED of PC Board blinking The reason is a too high evaporating temperature after 15 minutes from the beginning of the freezing cycle FREEZING CYCLE BIN FULL POWER TOO HI EVAP TEMP TOO HI COND TEMP NEW...

Page 187: ...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 Leaking of refrigerant through...

Page 188: ...Check during freezing cycle for Too low Discharge pressure of refrigerant system NEW MXG SERIES SERVICE ANALYSIS Compressor looses its efficiency...

Page 189: ...Check during freezing cycle for Too hi Suction pressure of refrigerant system NEW MXG SERIES SERVICE ANALYSIS Compressor looses its efficiency...

Page 190: ...Short or no refrigerant in the system Check during freezing cycle for Too low Discharge pressure of refrigerant system NEW MXG SERIES SERVICE ANALYSIS...

Page 191: ...Short or no refrigerant in the system Check during freezing cycle for Too low Suction pressure of refrigerant system NEW MXG SERIES SERVICE ANALYSIS...

Page 192: ...Short or no refrigerant in the system Check during freezing cycle for Proper frost of the evaporator serpentine NEW MXG SERIES SERVICE ANALYSIS...

Page 193: ...Leaking of refrigerant through the hot gas valve Check during freezing cycle for Too hi temperature of evaporator serpentine NEW MXG SERIES SERVICE ANALYSIS 0 10 70 40 30 20 80 60 50 10 20...

Page 194: ...Leaking of refrigerant through the hot gas valve Check during freezing cycle for Very poor frost of the evaporator serpentine NEW MXG SERIES SERVICE ANALYSIS...

Page 195: ...Leaking of refrigerant through the hot gas valve Check during freezing cycle for Too high Suction pressure NEW MXG SERIES SERVICE ANALYSIS...

Page 196: ...Leaking of water through the water inlet valve Check during freezing cycle for Water flowing through the water inlet tube NEW MXG SERIES SERVICE ANALYSIS...

Page 197: ...is OFF with both the Red and Yellow LEDs of PC Board ON steady The reason is the Condenser Sensor OUT OF ORDER FREEZING CYCLE BIN FULL POWER TOO HI EVAP TEMP TOO HI COND TEMP KO NEW MXG SERIES SERVICE...

Page 198: ...is OFF with both the Red and Yellow LEDs of PC Board blinking The reason is the Evaporator Sensor OUT OF ORDER FREEZING CYCLE BIN FULL POWER TOO HI EVAP TEMP TOO HI COND TEMP KO NEW MXG SERIES SERVICE...

Page 199: ...NEW MXG SERIES...

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Summary of Contents for MXG 328 A/W

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