LB 4712
MAINTENANCE MANUAL
FOR TECHNICAL ASSISTANCE
M
anual code
10066846 / R
el
. 0.00 / M
aRch
2012
Page 1: ...LB 4712 MAINTENANCE MANUAL FOR TECHNICAL ASSISTANCE Manual code 10066846 Rel 0 00 MaRch 2012 ...
Page 2: ...LB 4712 Machine code 10080586 Manual code 10066846 Rel 0 00 edition 03 2012 copyright laVaZZa S p a Tel 0039 011 2348429 Fax 0039 011 23480466 technicalservice lavazza it ...
Page 3: ...5 INSTALLATION AND START UP 9 5 1 unpacking 9 5 2 Positioning 9 5 3 Water connection 10 5 4 electric connection 11 5 5 Machine start up 11 6 CONFIGURATION 11 6 1 Programming 11 6 1 1 Programming of coffee doses 11 6 1 2 Programming autosteamer hot milk temperature 12 6 1 3 Programming autosteamer hot frothed milk temperature 12 6 1 4 loading of default data 12 6 2 Preparing hot drinks 12 6 2 1 dis...
Page 4: ...older 21 8 3 2 Body 22 8 3 3 Steam and autosteamer pipe 22 8 3 4 Brewing unit 22 9 TROUBLESHOOTING 23 9 1 Signalling and solutions to the most common problems 23 Maintenance manual for technical assistance Manual code 10066846 Rel 0 00 March 2012 IV ...
Page 5: ...edu res that if not observed could cause damage to the machine Environment ENVIRONMENT messages are displayed before pro cedures that if not observed could cause damage to the environment NOTE Messages show further information useful for the maintenance technician 1 1 3 Users This manual is designed for technicians qualified to maintain the machine lavazza is not responsible for damage derived fro...
Page 6: ...n 3700 W Boiler capacity 10 5 litres Boiler pressure 0 8 1 2 bar Max Safety valve calibration 1 9 bar Supply water pressure 1 5 5 bar Max coffee brewing pressure 8 9 bar net weight 76 Kg 1 3 5 External components 1 cup support grid 2 Water knob 3 Manual dispensing switch 4 Keyboard 5 Pressure gauge 6 Steam knob 7 Boiler level check window 8 Steam pipe 9 Filter holder 10 hot water pipe 11 autosteam...
Page 7: ...it is coffee dispensing In this system the brewing unit 1 is heated by a ther mosiphon circuit 2 connected to the heat exchanger 3 The same water is used for coffee brewing this en sure the same temperature for all coffees activation of the solenoid valve and the pump allows cold water to enter the exchanger 3 via the injector 4 heated water is carried to the unit 1 for brewing from the exchanger ...
Page 8: ...the boiler by means of the level check window located on the front of the machine 1 3 6 4 Flowmeter The flowmeter measures the quantity of water sent to the brewing unit for espresso brewing The flowmeter generates some electric impulses which are sent to the electronic control unit These impulses are read by the control unit and memorized during the programming of the dose The flashing of the led...
Page 9: ...nd therefore void any guarantee 1 3 6 8 Electronic control unit This unit electronically controls the coffee dose via the water flow in the flowmeter and the boi ler water filling It also manages the operation of the autosteamer pipe 1 3 7 List of accessories Booklet instructions for using the machine accessories a Rifle type brush B Brush with bristles c detergent for cappuccinatore d Puly caf e ...
Page 10: ...edure than that in dicated in the manual please contact lavazza technical service before starting Structural damage modifications tampering alterations or improper repairs could compromise the safety of the machine 2 1 Stop functions To stop the machine turn the main switch to 0 oFF 2 2 Safety devices The machine s described in this publication are desi gned in compliance with the specific standar...
Page 11: ... in this manual should be strictly followed and comply with the safety rules in force including the use of provided protection devices both integrated in the machine and individual This chapter illustrates the risks that the user may incur if he does not comply with the specific safety rules as described in this booklet The machine must be connected to an earthed instal lation If it is not done th...
Page 12: ...tan ces in electrical and electronic equipment and disposal of waste electrical and electronic equipment The crossed out wheeled bin symbol displayed on the appliance and or the packaging indicates that at the end of its life the product should not be treated as a generic household waste but should be delivered to an authorised local recycling centre of Weee collecting the components of the machin...
Page 13: ...uld not be exposed to weather Warning The presence of magnetic fields or proximity of elec tric machines which generate disturbances may cause malfunctions in the electronic control of the machine Warning With temperatures approaching 0 C there is the risk of freezing internal parts of the machine which con tain water Do not use the machine under these con ditions Attention Sufficient space must b...
Page 14: ...ncli nation for water to flow out of the drain The drain must be connected to a siphon that can be periodically inspect and cleaned in order to avoid the backflow of unpleasant odours To avoid oxidation and damage to the machine over time do not use iron fittings for the hydraulic con nection even if they are zinc plated Attention The hydraulic connection must be made in com pliance with local nat...
Page 15: ... and wait for the machine to warm up completely Attention During the machine s warm up phase about 20 mi nutes the safety valve will release steam for a few seconds until the valve itself closes Before using the machine carry out some dry cy cles with the capsule holders attached for a few se conds to release any air which may be in the circuit so that the brewing units are completely heated Befor...
Page 16: ...he keys 2 and 3 light up to confirm the set temperature The key 2 indicates the tens and the key 3 indicates the units To increase or decrease the temperature of 1 c use the keys 2 and 3 respectively To confirm the new set value pres the SToP PRoG 6 key for at least 3 seconds 6 1 3 Programming autosteamer hot frothed milk temperature Switch the machine on keeping the key 2 pressed for at least 3 s...
Page 17: ... Press the hot milk key 3 again to stop milk heating in advance When the set temperature is reached it is possible to enable steam dispensing again by keeping the hot milk key 3 pressed Attention The autosteamer ensures accuracy of 3 C on milk temperature between set and actual temperature only if the temperature of milk used is 4 C 6 3 2 Heating and frothing milk Since steam dispensing stops auto...
Page 18: ...not keep the nozzle immersed in the milk for a long time but only during milk frothing The system has a maximum time out of the auto steamer operation of 4 minutes 6 3 3 Setting of milk frothing To modify milk frothing through the autosteamer proceed as follows remove the left side panel of the machine a by means of the screw of the valve B turn clockwise to decrease the froth turn anticlockwise t...
Page 19: ... way valve c is mixed with the steam in the autosteamer interface l the steam comes out from the nozzle h the probe I connected to the electronic control unit detects the milk temperature during heating when the set temperature of milk is reached the elec tronic system stops air and steam dispensing A B L C I H D E F G ...
Page 20: ...Maintenance manual for technical assistance Manual code 10066846 Rel 0 00 March 2012 16 7 DIAGRAMS 7 1 Electrical mains connection wiring diagram ...
Page 21: ...Maintenance manual for technical assistance 17 Manual code 10066846 Rel 0 00 March 2012 7 2 Machine power supply wiring diagram ...
Page 22: ...Maintenance manual for technical assistance Manual code 10066846 Rel 0 00 March 2012 18 7 3 Wiring diagram of the electronic central unit ...
Page 23: ...Maintenance manual for technical assistance 19 Manual code 10066846 Rel 0 00 March 2012 7 4 Hydraulic diagram ...
Page 24: ...p on the heating element and boiler every year check the efficiency of the solenoid valve of the brewing unit every year check for possible water leaks on the bench and the condition of the discharge devices 8 2 Routine and supplementary maintenance 8 2 1 Brewing unit To replace the brewing unit components proceed as fol lows loosen the screw a remove the spring B replace the perforator c if damag...
Page 25: ...nit and check the pressure increase via the pressure gauge 4 check the pressure increase due to the expansion ef fect of the heated water until approximately 12 bar when this value is reached there is the confirmation of the correct operation of the valve and the sealing of the gaskets and solenoid valves disable the dispensing repeat the same test on the other brewing unit 8 3 Cleaning For perfec...
Page 26: ... pipe after each use dispense steam shortly and clean the steam and autosteamer pipes using a cloth dampened in lukewarm water check and clean the ends of the pipe clearing out the exit holes with a small needle weekly 8 3 4 Brewing unit Wash the brewing units weekly as described below use the blind filter holder pour the detergent see spare parts on the blind filter and attach the capsule holder ...
Page 27: ...r blocked check the power pump The water inlet solenoid valve is damaged Replace the water inlet solenoid valve The filter of the water inlet solenoid valve is clogged clean or replace the solenoid valve filter Too much water in the boiler The solenoid valve of the automatic level device is damaged Replace the solenoid valve of the au tomatic level device The heat exchanger is perforated Replace t...
Page 28: ...s clogged clean or replace the injector The brewing unit solenoid valve is clogged or dirty clean or replace the solenoid valve The flowmeter is jammed check replace the flowmeter Water leaks from the machine The drain tray does not discharge check the sewer drain The drain pipe is broken or detached or clogged check and restore the connection of the drain pipe to the drain tray Water leaks in the...
Page 29: ...lace the keyboard unacceptable coffee dispensing The coffee dose is not met The led of the dose key flashes The connection of the flowmeter is de fective check for proper connection of the flowmeter The connection of the electronic control unit is defective check for proper connection of the 8 pin connector of the electronic control unit The connector of the flowmeter has hu midity on it Remove th...
Page 30: ...e flowmeter has a contact between the positive pole and the earth check the connection of the flowmeter The pump leaks water Poor mechanical seal of the shaft or the o Ring check the pump and take any cor rective actions The inlet and outlet connections are loose Tighten the connectors The hexagonal nut of the pressure relief valve or the filter are loose Tighten the hex connection of the pressure...
Page 31: ...t aligned Install the pump motor joint The gasket or the o Ring of the pressure adjusting screw or the filter is defective Replace the gasket and the o Ring take care not to change the calibra tion of the valve The joint the coupling screw or the V shaped clamp are loose align and tighten the components which are loose The inlet is clogged even partially clean the filter holder The hex nut of the ...
