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vgl04.350 d vgl04.440 d operating instructions for the authorized specialist dual fuel burners 2-16 en fr ru es 4200 1018 5800 4200 1018 5700 01/2010 art nr 4200 1028 0500a

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general information contents guarantee safety contents general information guarantee safety 2 main statutory instruments 3 burner characteristics packaging 3 technical data see technical data nr 4200 1018 5700 installation assembly 4 gas connection 4 electrical connection 4 propane connection 5 fuel oil connection 5 start up preliminary checks/sealing 6 air pressure switch settings 6 settings 7 to 10 control and safety unit program 11 gas firing 12 setting and checking the safeties 12 fuel oil firing 13 maintenance 14 gas maintenance 15 fuel oil maintenance 16 guarantee installation and start up must be carried out in accordance with currently accepted practices by a qualified technician current regulations as well as the instructions in this documentation must be complied with the manufacturer will decline all responsibility in the event even of partial failure to comply with these requirements refer also to the guarantee certificate enclosed with the burner the general terms of sale safety the burner is designed to be installed on a generator connected to exhaust pipes in serviceable condition used for combustion products it should be used in locations where an adequate supply of combustion air is available and from which any waste products can be discharged the size and design of the flue must be appropriate for the fuel in accordance with current regulations and standards the control and safety unit and the cutoff devices used require a 230 vac+10 -15 50hz±1 power supply with an earthed neutral wire failing that power supply to the burner must include an isolating transformer and the appropriate safety devices 30 ma circuit breaker and fuse the burner must be able to be isolated from the system using a single-pole switch complying with the standards in force operating personnel should act with extreme caution in all cases and in particular should avoid any direct contact with areas that are not heatinsulated and electrical circuits water should not be splashed on to the burner s electrical components in the event of flooding fire fuel leakage or any abnormal operating odour suspicious noises etc stop the burner shut off the main power supply and the fuel supply and call in an approved specialist it is compulsory for all furnaces and their accessories flues and connection pipes to be maintained cleaned and swept at least once a year and prior to burner start up consult the regulations in force 1 2 3 4 5 6 7 8 9 10 11 12 13 fan motor and pump air pressure switch servomotor flexible hoses tc control panel air box blast tube electrical connection measuring bridge control and safety unit pump ignition transformer cover 2 01/2010 art nr 4200 1028 0500a

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general information technical data fr main statutory instruments dwellings order of 2 august 1977 and orders applying amendments and additional orders since then technical and safety regulations applicable to combustible gas and liquefied hydrocarbon installations located inside dwellings and associated outbuildings dtu standard p 45-204 gas installations formerly dtu no 61-1 gas installations april 1982 plus addenda since then dtu standard 65.4 technical instructions concerning boiler houses type of gas french standard nf c15-100 low-voltage electrical installations regulations departmental health regulations public buildings safety regulations in respect of fire and panic prevention in public buildings general provisions sections gz combustible gas and liquefied hydrocarbon installations sections ch heating ventilation refrigeration air conditioning and the production of steam and domestic hot water provisions specific to each type of public building non fr regulatory texts comply with local regulations and practices en group distribution pressure pn mbar pmin mbar 17 240 20 240 25 100 pmax mbar 25 hi at 0°c and 1,013mbar min kwh/m3 9,5 max kwh/m3 11,5 calibrating gas natural gas natural gas 20 2h 300 25 2l 300 37 3p 148 g20 360 30 8,5 360 45 24,5 180 26,5 g31 9,5 g25 propane burner characteristics monobloc dual-fuel oil vgl04.350 d and vgl04.440 d burners are blast-air units they use in turn liquid or gas fuels by acting manually when shut down on the switches tc front panel liquid fuel fuel oil with a viscosity between 1.6 and 6 mm2/s at 20°c cst with a calorific value hi of 11.86 kwh/kg they operate using two speeds gas fuels the gases listed in the table herein subject to appropriate adjustments to the gas and the pressure distributed taking into account contractual variations in the hi of natural gases they operate using two speeds they are suitable for generators which comply with standard en 303.1 they come with two fixed combustion head lengths kn-kl control and safety unit lgb22.230 is designed for intermittent operation limited to twenty-four hours in continuous operation mode packaging the burner is delivered in a package weighing approximately 48kg which includes the combustion head the boiler front seal a packet of nuts and bolts the boiler body the documentation folder with operating instructions electrical and hydraulics diagrams the boiler-house plate certificate of guarantee hydraulic fuel connection two l1.50m hoses with connections fitted the gas train valves and collector assembly 01/2010 art nr 4200 1028 0500a 3

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installation assembly assembly the burner is fastened to the boiler in a standardised manner if there are no holes the flange seal can be used as a template · fit the flange and its seal onto the boiler the burner is mounted with the volute pointing upwards if need be it can be mounted with the volute pointing downwards see turning the burner upside down below Øa 140 Øb 165 220 c m10 · place the burner s blast tube in the flange · hook up the burner using the bayonet system · tighten the three screws when the generator has a chamber access door line the space between the hole and the blast tube with refractory material not provided bold text recommended Ø gas connection the connection between the gas distribution system and the manifold must be hooked up by qualified personnel the pipes sections must be calculated so that load losses do not exceed 5 of the distribution pressure · mount the manifold on the burner making sure that the o-ring seal is properly positioned a ball valve not provided must be fitted upstream from the manifold the tapped connections used must be compliant with current standards tapered external thread and parallel electrical connection the electrical installation and connections must comply with the standards in force the earth must be connected and tested refer to the electrical diagram for connecting the burner and the regulator the burner is supplied for single-phase voltage of 230v 50 hz with neutral and earth for other voltages fit suitable protective devices not provided the connection is hooked up using a 7pole male plug provided with the burner as per the diagram opposite and a 4pole plug for the regulating thermostat vgl04.440 d volute upwards 1st stage vgl04.440 d volute downwards electrodes support internal thread providing a proper seal this type of assembly cannot be disassembled allow enough space for access to set the pressure switch the supply pipe must be properly blown down connections performed in situ must be leak-tested using foam designed for this purpose no leak should be found the burner and the gas train are connected by plugging in the connectors provided for that purpose option external connection of an alarm between s3 and n of time meters between b4 and n to count up the hours spent in operation and in-between b5 and n to count up the hours spent in operation at the nominal flow rate turning the burner upside down · turn the fastening head 180° 2x m8 screws a front plate is available on request for the vgl04.440 d burner the electrodes must be placed in the top vertical position if the burner body is mounted with the volute at the bottom carry out the following procedure · remove 3 screws the combustion components line-nozzle assembly · remove the turbulator and turn it 180° · remove the electrodes bloc · remove the electrodes support and place it in the upper position · fit the electrodes bloc back onto the support opposite the 1st stage nozzle diagram · fit the combustion components back on line-nozzle assembly 1st stage 4 01/2010 art nr 4200 1028 0500a

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installation operating on propane fuel oil connection vgl04.350 d propane gas vgl04.350 d propane gas conversion from natural gas propane gas make sure that the manifold is compatible with the change in the type of gas then · remove the deflector the six Ø5 injectors on the end of the nozzle the shutters on the nozzles · stop up the six plugs ref 2 on the end of the nozzle shutters ref 1 in accordance with the setting diagram stabiliser ref 3 on the nozzles line solely for the vgl04.440 d all the accessories are stored on the burner en l m corrected h m 4 3 2 1 +0,5 0 -0,5 -1 -2 -3 dual tube pump 60 l/h max fuel oil connection for connecting hoses to the pipes take the need to remove the burner into account dual tube connection the graphic opposite allows the diameter Ø to be determined along with pipe length l depending on the suction height h or the load height h for fuel oil with a density of 0.84 at a temperature of 10°c in an installation that at most has one valve a check valve and four elbow pieces single tube connection for a tank in load mode only remove the return hose the connection and the bypass plug stop it up using a cylindrical plug and a seal important · fill the suction pipes between the spray pump and the submerged pipe in the tank completely with fuel oil Ø 6/8 mm 17 14 12 10 9 8 7 6 4 Ø18/10 mm 54 47 40 34 31 27 24 21 14 8 altitude correction suction h or loading h pump altitude m 0-500 501-800 801-1300 1301-1800 1801-2200 dummy h m 0 0,5 1,0 1,5 2,0 for example altitude of 1,100 m dummy h 1 m actual h 2 m suction corrected h 2+1 =3m load corrected h 2-1 =1m choose the pipe Ø from the table depending on the length between the tank and the pump if suction corrected h exceeds 4 m fit a transfer pump max pressure of 2 bar 01/2010 art nr 4200 1028 0500a 5

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start up preliminary and leakage checks setting the air pressure switch burner start up involves installation by the fitter or his representative only they can guarantee boiler house compliance with currently accepted practices and regulations in force the fitter must first have a certificate of gas fuel conformity issued either by the approved body or network distributor and must also have leak-tested and drained the pipes upstream from the ball valve preliminary checks · check the following the nominal available voltage and electrical frequency and compare them with values indicated on the identification plate the polarity between phase and neutral the previously tested earth wire connection the lack of potential between neutral and earth the motor s direction of rotation · shut off the power supply · make sure there is no current · close the liquid fuel and gas valves · read the boiler and regulator manufacturers servicing instructions · check that the boiler is full of pressurized water the circulators works the mixing valves is/are open the burner combustion air supply and the combustion product exhaust pipe are working correctly and are compatible with burner s nominal power and the fuels the presence calibration and adjustment of electrical safeties outside the burner adjustment of the boiler s regulation circuit for fuel oil the tank fuel oil level the suction pipe is full the position of the suction and return hoses the feeding pressure of the fuel oil if the booster pump runs at 2 bar max the control and prefilter valves positions for gas that the gas type and distribution pressure are suited to the burner setting the air pressure switch · check the hose s connection to the plate at the pressure gauge s terminal · remove the transparent cover · the unit includes a index and a graduated mobile disk · provisionally set the value shown on the graduated disk to the minimum setting leakage test fuel oil · fit a pressure gauge and a vacuum meter onto the pump readings are taken when the burner is operating gas · connect a pressure gauge to the pressure take-off located upstream from the manifold · open the ball valve · check the supply pressure · use a purpose-designed product to check for leaks of the gas train s connections including the external filter no leak should be detected · drain the pipe downstream from the ball valve · reclose the drain valve remove the pressure gauge and close the pressure take-off 6 01/2010 art nr 4200 1028 0500a

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start up type burner power kw 170 200 250 350 220 250 350 440 y dimension mm 21 26 31 36 21 26 31 36 vgl04.350 d vgl04.440 d settings combustion components the burner is delivered set for natural gas to access the combustion components · disconnect the two ignition cables from the transformer and the ionisation cable from the measuring bridge · undo the three screws on the cover and remove the assembly · check the ignition electrodes and the ionisation probe · set the diffusors and the injectors in accordance with the instructions in the table below · upon reassembly check that the o-ring is fitted and in position · check the cover s seal with the burner operating combustion head the y dimension determines the secondary air between the mobile turbulator and the fixed blast tube by rotating gas line control button a readings in mm are performed using the vernier in accordance with the enclosed table upon rotation to the left the y dimension decreases and the co2 increases and vice versa en 01/2010 art nr 4200 1028 0500a 7

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start up type burner pow er kw 120/170 140/200 fuel oil danfoss nozzle us gal/h flow 45°b or 60°b rate kg/h 1st stage 2d stage 14 17 20 25 28 18,5 21 25 30 33,5 37 2,50 3,00 3,75 4,50 5,00 2,50 2,50 3,00 3,00 4,00 4,50 2,00 2,50 3,00 3,75 4,00 4,50 vgl04 350 d 175/250 210/300 240/350 150/220 165/250 180/300 210/350 240/400 265/440 fuel selection on delivery the burner is fitted to use in turn fuel oil or gas switching from one fuel to the other is done by hand upon shut down by means of a three-position switch on the right-hand side of the burner standard version using the switch during operation results in the control unit locking out to safety position while in operation you must leave the circuit for the 2 fuels open when the burner is using gas however during starting up or when in operation if fuel oil is unavailable it is mandatory to remove the pump coupling which is to be stored in a visible place before being put back when using liquid fuel important when two fuels are available apply settings in the following order 1 domestic liquid fuel oil natural gas or propane without modifying the air flow rate cams setting defined for fuel oil for 1st and 2d stages check and adjust the cleanness of the combustion at these two points by actuating the valve this procedure allows optimal use of the boiler/burner assembly 2 gas natural gas or propane fuels without modifying the setting of the air flow rate cams for fuel oil for 1st and 2d stages check and adjust the combustion cleanness at these two points by actuating the valve this procedure allows optimal use of the boiler/burner assembly vgl04 440 d 1kg fuel oil at 10°c 11.86 kw vgl04.350 d burners 1 nozzle brand danfoss monarch type b s plp angle 45° 60° 45° vgl04.440 d burners 2 nozzles brand danfoss monarch type stage 1 s b plp 45° 60° stage 2 45° or 60° 8 01/2010 art nr 4200 1028 0500a

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start up 2 4 5 6 four adjustable cams graduated disk air flap positioning index connection terminal board sqn 75.224a26 servomotor subject to the control and safety unit s program or depending on the equipment in association with a regulator pi or pid the servomotor brings about the opening or closing of the burner s combustion air intake device it features adjustable cams 2 the functions of which enable the generator s power to be attained when the servomotor is in operation the whole cams drum rotates an graduated disk 4 indicates the angular position optional feature possibility of adapting a transcription potentiometer en burner power ignit kw 110 120 vgl04.350 150 d 180 210 250 165 vgl04.440 180 d 210 240 270 type nom kw 170 200 250 300 350 220 250 300 350 400 440 air setting in ° cam iii ignition 13 15 20 23 27 15 18 20 23 27 30 cam i nom 22 25 35 47 55 25 27 28 43 55 55 setting · remove the cover · preset the cams depending on the power of the boiler and the values indicated in the table to do this · turn endless screws with a screwdriver or use adjust holes s the angular position is obtained in relation to the index on each cam · respect the cams angular proportionalities functions of the cams cam function ii blue closing upon shut-down at 0° iii orange ignition flow rate and regulation min i red nominal flow rate opening iv black slaving of the gas and fuel valve 2d stage cami v must be set in-between the value read off cams iii and i sqn 75.224a26 01/2010 art nr 4200 1028 0500a 9

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start up settings description gas valve valve mb zrdle b01s a compact assembly including a filter an adjustable pressure switch a nonadjustable safety valve fast opening and closing an adjustable pressure regulator two valves 1st and 2d stage of which the flow stage is incrementally adjustable on opening upon delivery the valve is preset for the power values indicated in the table the incremental advance is set to a two-turn opening the stage two valve is opened to the maximum extent the pressure switch is set to the minimum value pressure regulator setting the regulator output pressure is done in pbr the pressure set provides the desired flow rate general settings procedure setting stage-2 is done solely by actuating the pressure regulator the stage-2 valve button c is opened to the maximum extent setting the incremental advance upon ignition and the stage change is done by pressing button b setting stage-1 is done by actuating crown d incremental advance setting main flow rate setting 1st stage setting pressure switch coil access to the filter connection flange pbr pressure regulator setting s 20 40 to 200 dapa s 50 40 to 500 dapa incremental advance setting this hydraulic brake function acts the incremental advance and stage change · unscrew plastic plug b · turn it upside down and use it as a spanner · turn it arrow the incremental advance is increased arrow the incremental advance is decreased special case nominal flow rate setting this is necessary only if the flow rate read with a pressure at the regulator of 40dapa is too high do as follows · loosen the locking screw without touching the painted screw opposite plug c has a 4.5-turn travel length · rotate the arrow clockwise the flow rate will decrease and vice versa it might be necessary to adjust the pressure · retighten the locking screw painted screw locking screw setting the stage one flow rate · loosen the locking screw without touching the painted screw opposite · rotate crown d clockwise by hand without using a tool the flow rate will decrease and vice versa · retighten the locking screw 10 01/2010 art nr 4200 1028 0500a

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start up control signals from the unit necessary input signals 01/2010 art nr 4200 1028 0500a 0 5 6 7 8 regulation shut-off switching on the transformer switching on the fuel valve flame control function tw t1 t2 t3 t4 t10 t11 t12 wait time 9 s pre-ventilation time 20 s safety time 3 s max pre-ignition time 3 s time between ignition and regulation start 8 s pre-set time for air pressure signal 3 s programmed servomotor opening time programmed servomotor closing time 1 2 3 4 switching on the unit switching on the servomotor switching on the motor air pressure control 11 en

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start up gas operating cycle test · open and immediately reclose the ball valve · power up the burner · select the fuel and the 1st stage position on the tc control panel · close the regulator circuit · release the control and safety unit and check that it is working correctly · the program sequence should be as follows controlled pre-ventilation time 20s the total pre-ventilation time can exceed 20 s electrode ignition 3s the valves open the valves close no more than 3s after opening burner stops due to either lack of gas pressure or control and safety unit lockout due to the flame disappearing firing is only possible after this very important operation of checking the ignition cycle has been carried out gas firing warning firing may take place only once all the conditions listed in the preceding sections are fulfilled · connect a 0-500 µa dc microammeter in place of the measuringbridge check the polarity · check that the fuel oil line is closed · open the ball valve · place the switch in gas and 1 small flame 1st stage position · close the thermostat circuit · unlock the control and safety unit the burner is in operation · place the switch in 2 large flame 2d stage position · check the combustion co and co2 · take an ionisation current reading ranging from 200 to 500µa · measure the gas flow rate at the meter · adjust the gas flow rate by adjusting the pressure regulator · adjust the air flow rate by adjusting servomotor cam i adhere to the co2 values and smoke temperatures recommended by the boiler manufacturer so that the effective output required may be obtained · reduce the power to 1st stage · check the combustion · take an ionisation current reading · measure the gas flow rate at the meter · adjust the gas flow rate by actuating crown d · adjust the air flow rate by actuating servomotor cam iii · raise the power to the nominal flow rate and check the stage shifts increase and decrease · make fine adjustments to the settings y dimension · retighten the valve s locking screw · check for leaks of the manifold connections with the burner in operation by using a suitable foam no leak should be found setting and checking gas safeties with the burner in operation · set the gas pressure switch to the minimum distribution pressure · slowly close the ball valve the burner should stop operating due to a lack of gas pressure · open the ball valve again when the burner is once again ignited and running at a low flow rate · find the air pressure switch cut-off point locking · multiply the value read by 0.9 to obtain the setting point · restart the burner · gradually close off the burner air intake · check to see that the co rate remains below 1 before locking out to safety · otherwise increase the setting value for the air pressure switch and restart the test · disconnect the gas measuring instruments · close the pressure taps · restart the burner at a low flow rate · check for leaks gas and fuel oil with the burner in operation · simultaneously disconnect both microammeter cables the burner should immediately lock out to safety with tight locking · replace the ionization bridge · burner running on gas or fuel oil both fuels are available · switch on the fuel oil or the gas the burner should immediately lock out to safety with tight locking · put the covers back on · check for leaks between the flange and the boiler front · check the combustion parameters under actual operating conditions doors closed etc and perform general tests and tests on the seals in the various circuits · record the results in the relevant documents · programme the burner for automatic operating mode · provide all the data required for proper operation 12 01/2010 art nr 4200 1028 0500a

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start up fuel oil firing warning firing may take place only once all the conditions listed in the preceding sections are fulfilled · connect a 0-500 µa dc microammeter in place of the measuring bridge check the polarity · check that the gas fuel line is closed · check that the fuel oil hydraulic circuit valves are open · place the switch in fuel oil and 1 small flame 1st stage position · close the thermostat circuit · unlock the control and safety unit the burner is in operation during the pre-ventilation period · drain the pump by opening a pressure tap · check and adjust the atomization pressure see the table as soon as the flame appears · check combustion opacity and co2 · take a flame current reading value between 200 and 500 µa · toggle the switch to the 2 large flame 2d stage position to obtain the nominal flow rate · check and adjust the atomization pressure see the table · check the combustion · adhere to the co2 values and smoke temperatures recommended by the boiler manufacturer so that the effective output required may be obtained · take a flame current reading value between 200 and 500 µa · reduce the power to the minimum flow rate and check the combustion parameters · check the quality of ignition and stage changes increase and decrease · optimise this quality by adjusting the y dimension · raise the power to the nominal flow rate and check the combustion parameters · check for leaks on the fuel circuit while the burner is in operation · maximum low pressure of 400mbar or 305 mm hg the adjustments and safety checks are the same as in the gas and fuel oil paragraph when the fuel oil combustion tests have been validated return to gas mode perform combustion tests which must be the same as for the initial adjustment en vgl04.350 d 1 2 3 4 5 6 7 8 9 suction return nozzle outlet pressure take off vacuum gauge take off pressure setting bleed plug low pressure setting high pressure setting fuel pressure setting 1st stage at 11 bar 2d stage at 22 bar · turn clockwise screws 8 for first stage and 9 for second stage to increase pressure and vice versa · check for leaks g 1/8 g 1/8 vgl04.440 d valve open closed hydraulically type pump pressure bar valve stage 1 nc oooo 2 nc offo 3 nc oooo vgl04.350 d 1 nozzle vgl04.440 d 2 nozzles al 65c at2 45d bp 11 hp 22 13,5 1 2 1 2 nc valve notmally closed no valve normally opened 01/2010 art nr 4200 1028 0500a 13

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maintenance important ensure maintenance operations are performed regularly at least once a year by qualified personnel · shut off the power supply at the single-pole switch · check that there is no current · close the fuels intake · actuate the ball valve several times to test it is working full opening and closing without leaks · remove the burner s cover settings values are found in the start up section only use manufacturer s spare parts combustion components check · disconnect the two ignition cables on the transformer · remove the cell from its seating in the cover · remove the fuel connection tubes · undo the three cover screws · slightly rotate the cover and remove the combustion head · check the settings and condition of the electrodes ignition cables deflector nozzles diffusors and injectors · upon reassembly check that the o-ring is in place and is in the correct position · wipe the cell clean with a clean dry rag · place the cell back onto its seating · check for leaks by using a suitable foam cleaning the fan · undo the five screws on the motor plate · hang the plate up on the case by its hook · clean the air flow circuit and the turbine · reassemble cleaning the air box · remove the two screws from the gas train on the casing · undo the three nuts on the boiler attachment flange · take out the burner bayonet fastening · undo the four screws fastening the air box to the casing · remove all dust from the air box and the sound insulation foam · refit the air box and then the burner · fasten the gas train · check for leaks removing the blast tube · remove the two manifold screws on the housing · undo the three screws on the fastening flange on the boiler · take out the burner bayonet fastening · undo the three blast tube screws · change the blast tube · refit the burner and then the gas train · if necessary fit refractory material in the space between the hole and the blast tube · check for leaks motor-driven pump · check the atomization pressures the circuit tightness the pump/motor coupling the state of the hoses cleaning the fuel oil pump filter the filter is inside the pump it must be cleaned each time maintenance is performed · close the fuel oil intake valve · place a container under the pump to catch any fuel oil · remove the screws and cover · remove the filter and clean or replace it · refit the filter and the cover with a new gasket · open the fuel oil valve · check for leaks gas filter check the multibloc s filter should be checked at least once a year and changed if dirty · remove the screws from the cover of the filter upstream or the multibloc s filter · remove the filter element be careful not to leave any dirt in its housing · do not use pressurised fluid · replace with an identical new element · put the cover and the screws back on · open the ball valve · check for leaks · perform a combustion check gas and fuel oil valves gas and fuel oil valves do not require any special maintenance no repairs are allowed defective valves must be replaced by a competent technician who will then perform new seal operating and combustion checks cleaning the cover · clean the cover with water containing detergent · fit the cover back on remarks after every maintenance operation · check the combustion parameters under actual working conditions doors closed cover in place etc · perform the safety checks · record the results in the relevant documents 14 01/2010 art nr 4200 1028 0500a

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gas maintenance · when there is a breakdown check the unit is powered up power and control there is a supply of fuel pressure and opening of the valves the regulation fittings the position of the switches on the control panel if the problem persists · check the various symbols on the control and safety unit for the programme described · the safety components should not be repaired but should instead be replaced with items that have the same product references only use manufacture spare parts remarks after any work · check the combustion as well as the sealing of the various circuits · carry out safety checks · record the results in the relevant documents en symbol fault burner stops nothing happening gas pressure normal thermostatic chain causes insufficient gas pressure gas pressure switch misadjusted or defective corrective action adjust distribution pressure clean the filter check and/or replace the gas pressure switch foreign body in pressure take-off channel clean the pressure take-off tubes do not use a pressurized fluid thermostats defective or misadjusted replace the thermostats air pressure switch contact welded defective unit flame relay parasitic flame signal air pressure switch incorrect gas flow defective flame monitoring circuit replace the pressure switch clean and change the uv cell change the control and safety unit adjust or change the pressure switch adjust the gas flow check the condition and position of the cell and the uv module check the condition and connections for the flame check circuit cable and measuring nipple no ignition arc ignition electrodes short-circuiting ignition cables damaged or defective ignition transformer defective control and safety unit adjust clean or replace the electrodes connect or replace the cables replace the ignition transformer change the control unit check cables between control unit servomotor and valves safety unit cycling iii safety lockout during pre-ventilation p safety lockout safety lockout 1 2 safety lockout ou safety lockout electromagnetic valves not opening mechanical blockage in valves parasitic flame on thermostatic cut-off no flame signal when running check change the coil replace the valve check for leaks on the gas valves fit a post-ventilation device check the cell s circuit check or change the control and safety unit 01/2010 art nr 4200 1028 0500a 15

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