Viessmann VIESMANN VITOLIGNO 300-H Page 49 Technical Manual Download

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Pellet silo type 12 to 21

□ 150

□ 500

Max. load on the central support plate
Type 12: 1200 kg
Type 17: 3000 kg
Type 21: 3000 kg

Max. load per support plate
Type 12: 600 kg
Type 17: 1500 kg
Type 21: 1500 kg

Pellet silo

Type 12

Type 17

Type 21

600

850

1050

1200

1700

2100

Pellet silo type 25 and 29

□ 150

□ 500

□ 150

Max. load on the central support plate
Type 25: 3000 kg
Type 29: 6000 kg

Max. load per support plate: 1500 kg

Pellet silo

Type 25

Type 29

1250

1450

2500

2900

Fuel storage

(cont.)

VITOLIGNO 300-H

VIESMANN

5672 507 GB

Summary of Contents for VIESMANN VITOLIGNO 300-H

Page 1: ...VIESMANN VITOLIGNO 300 H Boiler for pellets and woodchips 80 to 101 kW VITOLIGNO 300 H Boiler for automatic charging with pellets and woodchips 5672 507 GB 9 2014 Technical guide ...

Page 2: ... Vitoligno 300 H dimensions 14 3 Ecotronic control unit for Vitoligno 300 H 3 1 Ecotronic specification 21 Design and function 21 Ecotronic specification 21 3 2 Ecotronic accessories 21 Information on Vitotrol 200A and 300A 21 Vitotrol 200A 21 Vitotrol 300A 22 Information on room temperature hook up RS function for remote control units 23 Vitotrol 350 23 Room temperature sensor 25 Temperature sens...

Page 3: ...1 Minimum clearances 52 7 4 Water connection 54 Heating connections 54 Boiler circuit and shunt pumps 54 Safety equipment to EN 12828 54 7 5 Electrical installation 54 7 6 Safety equipment 54 Expansion 54 Extinguishing devices 54 Prevention of combustion chamber overfilling 55 Fuel supply burn back protection RSE 55 Shut off gate valve 55 Rotary lock valve 55 Low water indicator 55 Minimum pressur...

Page 4: ...trollability at partial load and the emissions from the system Determining the water content The water content is generally determined with reference to the so called drying cabinet procedure on which the CEN standard is also based As part of this a fuel sample is weighed when wet dried in a drying cabinet at approx 105 C for several hours and then weighed again The proportion of water in the fuel...

Page 5: ...isture level The water content in is relative to the moist fuel mass or the fresh substance FS the fuel moisture level is relative to the absolutely dry fuel mass TS The specifications for Köb products use the water content w Example If 100 kg of fuel contain 50 kg water the fuel has a water content of 50 w50 and a fuel moisture level of 100 u 100 0 20 40 60 80 100 120 140 160 180 200 0 10 20 30 4...

Page 6: ...ssing indus try in large amounts through planing or sawing Wood remnants are compressed under high pressure and formed into pellets i e they are pressed into a cylindrical shape The raw material is stored and transported under completely dry con ditions System users should also ensure completely dry storage con ditions This is the only way to guarantee optimum and effective com bustion Pellet requ...

Page 7: ... Float in water Types of pellet delivery In their loose form pellets are transported by silo tanker and pumped into the storage room via a hose system Careful handling of pellets ensures a low proportion of dust trouble free boiler charging and a constant heating output by the solid fuel boiler 1 3 Principles of woodchip combustion for generating heat What are woodchips Woodchips are made from 100...

Page 8: ...odchips from wood remnants S 200 w20 G30 G50 P45 P63 Soft natural woodchips S 200 w20 to w35 G30 G50 P45 P63 Natural sawdust S 250 w15 G30 G50 P45 P63 Dry mixed shavings woodchips from wood remnants S 250 w20 to w35 G30 G50 P45 P63 Soft natural woodchips S 300 w20 to w35 G30 G50 P45 P63 Soft hard natural woodchips S 350 w20 to w35 G30 G50 P45 P63 Hard natural woodchips Note With coarse content lim...

Page 9: ...g the above limits will shorten the service life of the combus tion chamber and the solid fuel boiler This also means that the amount of maintenance work increases and shorter service intervals The proportion of dust like and fine grained materials should also be minimised in accordance with ÖNORM M 7133 Max percentage of finest woodchips dust wood particles 1 0 mm as per ÖNORM M 7133 10 0 of tota...

Page 10: ...ubular heat exchanger The tubular heat exchanger is automatically and regularly cleaned by turbulators At the same time the turbulators optimise boiler efficiency Ash in the heat exchanger is also conveyed to the ash box via an ash removal screw conveyor automatic ash removal from the heat exchanger This pro vides for long cleaning intervals and a permanently good heat trans fer The boiler is full...

Page 11: ...t barrier for level monitoring barrier layer feed screw conveyor Pt1000 contact temperature sensor on the feed screw conveyor Infrared light barriers for level monitoring of the fuel in the combus tion chamber Lambda probe Pt1000 flue gas temperature sensor Pt1000 return temperature sensor Pt1000 boiler water temperature sensor High limit safety cut out Pt1000 outside temperature sensor Temperatur...

Page 12: ...ory to EN 303 5 5 5 5 Boiler dimensions Total length incl ash box mm 1721 1721 1721 Overall width without light barrier mm 865 865 865 Total width with feed screw conveyor mm 1765 1765 1765 Total height mm 1912 1912 1912 Minimum boiler transport dimensions Length mm 1590 1590 1590 Width mm 840 840 840 Height mm 1860 1860 1860 Minimum room height mm 2300 2300 2300 Pellet hopper capacity l kg 200 13...

Page 13: ... 0 06 QN w30 O2 8 m3 s 0 06 0 08 0 08 Flue outlet 7 mm 200 200 200 Required draught At rated heating output mbar Pa 0 05 5 0 05 5 0 05 5 At partial load mbar Pa 0 03 3 0 03 3 0 03 3 Max permiss draught mbar Pa 0 15 15 0 15 15 0 15 15 Efficiency At full load 94 9 94 2 94 2 At partial load 92 7 92 7 92 7 4 Actual flue gas temperature as average gross value per EN 304 at 20 C combustion air temperatu...

Page 14: ...ons Rated heating output kW 80 99 101 Dimensions a mm 1912 1912 1912 b mm 1856 1856 1856 c mm 506 506 506 d mm 470 470 470 e mm 735 735 735 f mm 590 590 590 g mm 364 364 364 h mm 865 865 865 k mm 1579 1579 1579 l mm 1765 1765 1765 m mm 1883 1883 1883 Product information cont 14 VIESMANN VITOLIGNO 300 H 2 5672 507 GB ...

Page 15: ...ng output kW 80 99 101 Dimensions a mm 1912 1912 1912 b mm 1856 1856 1856 c mm 506 506 506 d mm 470 470 470 e mm 364 364 364 f mm 708 708 708 g mm 865 865 865 h mm 1579 1579 1579 k mm 1765 1765 1765 l mm 1883 1883 1883 Product information cont VITOLIGNO 300 H VIESMANN 15 5672 507 GB 2 ...

Page 16: ...ng output kW 80 99 101 Dimensions a mm 180 180 180 b mm 80 80 80 c mm 70 70 70 d mm 848 848 848 e mm 677 677 677 f mm 403 403 403 g mm 187 187 187 h mm 1780 1780 1780 k mm 1662 1662 1662 l mm 1076 1076 1076 m mm 74 74 74 Product information cont 16 VIESMANN VITOLIGNO 300 H 2 5672 507 GB ...

Page 17: ... d a Dimensions Rated heating output kW 80 99 101 Dimensions a mm 90 90 90 b mm 1065 1065 1065 c mm 596 596 596 d mm 1662 1662 1662 e mm 460 460 460 f mm 1473 1473 1473 g mm 248 248 248 Product information cont VITOLIGNO 300 H VIESMANN 17 5672 507 GB 2 ...

Page 18: ... c e d b a Dimensions Rated heating output kW 80 99 101 Dimensions a mm 52 52 52 b mm 1257 1257 1257 c mm 1044 1044 1044 d mm 1663 1663 1663 e mm 1656 1656 1656 f mm 487 487 487 Product information cont 18 VIESMANN VITOLIGNO 300 H 2 5672 507 GB ...

Page 19: ...ns pellet version a b c d Dimensions Rated heating output kW 80 99 101 Dimensions a mm 7 800 7 800 7 800 b mm 87 87 87 c mm 1983 1983 1983 d mm 1926 1926 1926 Product information cont VITOLIGNO 300 H VIESMANN 19 5672 507 GB 2 ...

Page 20: ...sions pellet version d c b a Dimensions Rated heating output kW 80 99 101 Dimensions a mm 800 800 800 b mm 1721 1721 1721 c mm 839 839 839 d mm 249 249 249 Product information cont 20 VIESMANN VITOLIGNO 300 H 2 5672 507 GB ...

Page 21: ...atification in the heating water buffer cylinder Use of the residual boiler heat after burnout Supporting auxiliary and service functions Enabling a second heat generator Protection against overheating through heat transfer to the heating water buffer cylinder shutting down the flue gas fan and closing the primary air damper Activation of cylinder priority control if required The requirements of E...

Page 22: ...Settings Set room temperature for standard mode normal room tempera ture and reduced mode reduced room temperature Set DHW temperature Operating program switching times for heating circuits plus fur ther settings via plain text menu on the display Party and economy mode can be enabled via the menu Integrated room temperature sensor for room temperature hook up Installation site Weather compensated...

Page 23: ... for wall mounting Extensions and sensors that can be used by expanding the system with Vitotrol together with controller modules Vitotrol with 1 con troller module Vitotrol with 2 con troller modules Vitotrol with 3 con troller modules Vitotrol with 4 con troller modules Vitotrol with 5 con troller modules Max number of extensions 4 8 12 16 20 Max number of sensors 8 16 24 32 40 Accessories for V...

Page 24: ...ong distance heat line sub distributor A Sub distributor B Bypass C Contact temperature sensor D Pump E Control valve Via a long distance heat line a building is supplied with separate heat distribution The long distance line is controlled upstream according to the demand of the heating circuits The heating circuits of the separate heat distribution must be controlled via the Vitotrol 350 Note The...

Page 25: ...rmissible ambient temperature Operation 0 to 40 C Storage and transport 20 to 65 C Temperature sensor Immersion temperature sensor for DHW heating as a cylinder tem perature sensor to plug 17 of the extension kit The contact temper ature sensor which is part of the standard delivery of the extension kit is used as a return temperature sensor to plug 2 of the extension kit The sensor well is not in...

Page 26: ...re sensor Immersion temperature sensor as cylinder temperature sensor with connecting lead In systems with DHW cylinders from Viessmann the cylinder temper ature sensor is installed directly into the sensor well of the threaded elbow in the heating water return Lead length 5 m fully wired IP rating IP 32 to EN 60529 ensure through design installation Sensor type Viessmann Pt1000 Permissible ambien...

Page 27: ... 0 180 Specification Rated voltage 230 V Rated frequency 50 Hz Power consumption 4 W IP rating IP 42 to EN 60529 Ensure through design instal lation Safety category II Permissible ambient temperature During operation 0 to 40 C During storage and transport 20 to 65 C Torque 3 Nm Runtime for 90 120 s Flow temperature sensor contact temperature sensor 42 66 60 Secured with a tie Specification Cable l...

Page 28: ...tion of a separate mixer motor Components Mixer PCB for the connection of a separate mixer motor Flow temperature sensor contact temperature sensor Plug for connecting the heating circuit pump and the mixer motor Power cable 3 0 m long with plug BUS cable 3 0 m long with plug Mixer PCB 58 180 140 Specification Rated voltage 230 V Rated frequency 50 Hz Rated current 2 A Power consumption 1 5 W IP r...

Page 29: ...m temperature limiter for underfloor heating systems only in conjunction with metal pipes The temperature limiter is installed into the heating flow and switches the heating circuit pump OFF if the flow temperature is too high 72 130 95 Specification Cable length 4 2 m fully wired Setting range 30 to 80 C Switching differential max 14 K Breaking capacity 6 1 5 A 250 V Setting scale inside the casi...

Page 30: ... HE circulation pump Check valve Automatic extinguishing device Part no 7583 145 A B C a D A Fill level monitor B Extinguishing water tank 25 l C Material supply D Combustion Dimensions a mm min 500 Note Pipe to tank to valve 1 2 as short as possible Valve adjustment Danfoss AVTA 15 50 90 C 3 corresponds to approx 80 C Ash box reserve Part no ZK01 533 Mobile ash box 45 l capacity Product informati...

Page 31: ...rature approx 100 C connec tion R Standard delivery Thermally activated safety valve incl sensor well Note We recommend using the thermally activated safety valve even if it is not required by local safety regulations Safety valve 3 bar Part no 7143 783 Product information cont VITOLIGNO 300 H VIESMANN 31 5672 507 GB 4 ...

Page 32: ...ischarge system Page Fuel pellets or woodchips Pellets G 30 G 50 G 100 P 16 P 45 P 63 5 P 63 Flexible agitator discharge AF From p 33 X X X X X Vacuum system From p 36 X 5 With coarse content limitation 1 to 125 mm Fuel discharge 32 VIESMANN VITOLIGNO 300 H 5 5672 507 GB ...

Page 33: ...crew conveyor motor 3 x 400 V Switching by the boiler control unit enabled by the following con veyor device Speed output Project related and subject to boiler output and fuel Light barrier for monitoring the fill level at the end of the sealed screw conveyor channel Outlet with inspection cover and safety limit switch To be carried out by the customer Installation of an intermediate floor require...

Page 34: ...F 3 5 m AF 4 5 m a Max discharge radius m 1 75 2 25 b Open area of the discharge screw conveyer c Max discharge screw conveyor length m 3 75 4 25 Note 1 Installation preferably in concrete with recess for screw conveyor and gearbox of agitator centre 2 Suitable for woodchips up to G 30 G 50 3 Not suitable for wood briquettes and shredded matter from used or residual wood 4 Speed output Project rel...

Page 35: ...s B Remnants pellets Note 1 An inclined installation position reduces the discharge rate and the level of emptying For each degree of inclination the discharge rate is reduces by approx 2 3 2 Speed output Project related and subject to boiler output and fuel Sizing by Köb AF discharge screw conveyor to flexible agitator discharge For part no see pricelist The fuel is moved by the flexible agitator...

Page 36: ...up to a distance of 15 m and to a height differential of 5 m The flexible positioning of the vacuum system enables installation even in tight spaces G A B C D E F H A Return air connector B Fill connector C Deflector D Pressure hose E Suction hose F External suction turbine G Vitoligno 300 H with pellet hopper H Discharge screw conveyor 4 3 2 5 4 1140 1140 500 640 1140 1 4 4 1140 1140 A B C D E G ...

Page 37: ... long 5 D 3 42 m 1 pellet supply and return air hose 15 m long 1 1 wall module vacuum system 0 64 m long 2 1 screw conveyor module 0 5 m long 3 1 screw conveyor module 1 14 m long 4 1 screw conveyor terminal module 1 14 m long 5 E 4 06 m 1 pellet supply and return air hose 15 m long 1 1 wall module vacuum system 0 64 m long 2 2 screw conveyor modules 1 14 m long 4 1 screw conveyor terminal module ...

Page 38: ...y adjacent to the instal lation room Pellets can be transported up to a distance of 15 m and to a height differential of 5 m A B C D E F H K G A Pellet silo B Return air connector C Fill connector D Pressure hose E Suction hose F External suction turbine G Vitoligno 300 H H Suction hose K Pressure hose Fuel discharge cont 38 VIESMANN VITOLIGNO 300 H 5 5672 507 GB ...

Page 39: ...ithout lid must be ordered separately DN100 Pellet filling system 45 for pellet silo Part no 7527 540 For type 29 17 29 and 21 29 see Vitoset pricelist With flared flange on both sides 2 fill connectors 2 pipe bends 45 2 Storz A couplings with clamping ring Without lid must be ordered separately Cover for pellet filling system Part no 7527 541 2 pce Without venting function Cover for pellet fillin...

Page 40: ...100 45 Pipe bend 90 with flared flange Part no 7513 063 7 100 mm 252 252 R 2 0 0 Clamping ring with gasket Part no 7501 906 7 100 mm For connecting pipes and pipe bends with flared flange D N 1 0 0 Fixing clamp Part no 7284 826 7 100 mm For fixing pipes to a wall or ceiling D N 1 0 0 Fuel discharge cont 40 VIESMANN VITOLIGNO 300 H 5 5672 507 GB ...

Page 41: ...ounting bracket C Cover panel a mm 415 b mm 326 c mm up to 340 d mm 280 e if floorstanding mm 45 f if wall mounted mm 25 Information regarding fire regulations in the pellet storage room according to Muster Feuerungsverordnung M FeuVO in Ger many issue June 2005 and TRVB H118 in Austria The manual changeover unit can be fitted inside a fire sector No addi tional fire protection measures are requir...

Page 42: ...uirements for the ventilation of pellet stores according to VDI Directive 3464 Vents should be closed during filling so that the vacuum fan can create a slight negative pressure in the storage room According to static requirements the following wall thicknesses have proven to be useful e g bricks 17 cm rendered on both sides hollow breeze blocks 12 cm rendered on both sides concrete 10 cm plaster ...

Page 43: ...ld be sufficiently vented before anyone enters Room discharge with screw conveyor system B D H G K A C F E4060 6340 55 55 235 314 L M L 1 6 1 9 L L 295 174 217 6 6800 200 A Protective boards at the entrance to the storage room B Discharge area screw conveyor system C Deflector D Discharge to the vacuum system E Min max length of discharge area F Max storage room length G Return air connector H Fil...

Page 44: ...oses For information on the hoses see page 45 a mm 100 b mm approx 3000 Information on storage room accessories Protective boards with Z brackets A B A C A Z bracket length 2000 mm B Protective board 30 mm thick on site C Door to the storage room Z brackets are available as accessories for installation of the protective boards Never install Z brackets up to the ceiling to facilitate the removal or...

Page 45: ...he return air hose can be made up of several pieces The connection piece should be made of metal to ensure continuous earthing Never expose the hoses to temperatures above 60 C i e never route them near heating pipes or flue pipes that are not thermally insulated Never route outdoors risk of becoming brittle due to UV radiation Fill connector and return air connector Arrange the connectors so that...

Page 46: ...room clad them with a material compliant with fire resistance category F 90 rock wool or similar Earth each extension pipe using pipe clips Plastic pipes should not be used as extension pipes A B C D A Connector B Fire resistant cladding F 90 C Extension pipe D Pipe clip Connector installation options Setting into brickwork The connector is set into the outlet with mortar without thermal insulatio...

Page 47: ...a 4 0 mm thick pressed rubber mat with fibre reinforcement for high strength Install deflector B at least 100 mm from the wall opposite the fill con nector This deflector protects the pellets the brickwork and the plas ter render Pieces of plaster render or wall that have been prised off can hinder the pellet supply and ash removal from the boiler Standard delivery Deflector 1 0 x 1 2 m Section an...

Page 48: ...0 1800 2500 500 2 8 4 7 7419 157 25 2500 2500 1800 2500 900 4 8 6 7 7419 158 29 2900 2900 1900 2500 900 6 0 9 0 7419 159 17 29 1700 2900 1900 2500 500 900 3 6 5 4 7419 161 21 29 2100 2900 1900 2500 500 900 3 8 6 1 7419 162 Silo types 17 29 and 21 29 can be filled from the long side connector clearance d 900 mm as well as from the narrow side connector clearance d 500 mm Note Filling from the narro...

Page 49: ...pe 17 1500 kg Type 21 1500 kg Pellet silo Type 12 Type 17 Type 21 a mm 600 850 1050 b mm 1200 1700 2100 Pellet silo type 25 and 29 150 500 A B b a b 150 a A Max load on the central support plate Type 25 3000 kg Type 29 6000 kg B Max load per support plate 1500 kg Pellet silo Type 25 Type 29 a mm 1250 1450 b mm 2500 2900 Fuel storage cont VITOLIGNO 300 H VIESMANN 49 5672 507 GB 6 ...

Page 50: ... wall and is installed in a separate room The ceiling and walls of the fuel storage room must have a fire rating of F90 Doors between boiler room and flue store as well as doors and windows to the outside must meet standards T30 or G30 In legal terms fire safety in Austria is regulated by the various national building regulations of the individual states the foundation for these regulations is TRV...

Page 51: ...m from the boiler The temperature in the boiler room when operating the system must not fall below 10 C point of capture inside of exterior wall Avoid air contamination by halogenated hydrocarbons e g as in sprays paints solvents and cleaning agents Prevent very dusty conditions Prevent high levels of humidity Prevent frost and ensure good ventilation In rooms where air contamination by halogenate...

Page 52: ...e from combustible materials and fitted furniture or be shielded from them to ensure the temperature on such materials furniture does not exceed 85 C when the combustion equipment is delivering the rated heating output Alternatively maintain a distance of at least 40 cm Minimum clearances Minimum room height 2300 mm Note The specified wall clearances are required for installation and main tenance ...

Page 53: ...400 1400 1400 d mm 400 400 400 e mm 1400 1400 1400 Wall clearances for boiler with pellet hopper b a c d Dimensions Rated heating output kW 80 99 101 Wall clearances a mm 400 400 400 b mm 600 600 600 c mm 400 400 400 d mm 1400 1400 1400 Design information cont VITOLIGNO 300 H VIESMANN 53 5672 507 GB 7 ...

Page 54: ...afety equipment for the heating system must be installed by the authorised heating contractor EN 12828 applies to the design of hot water heating systems with safety temperatures up to 110 C This standard contains safety requirements for heat generators and their systems Sealed expansion vessel A safety valve at the highest point of the boiler or on a pipe connected to this point It must not be po...

Page 55: ...or prDIN EN 12828 specifies that boilers must be equipped with a low water indicator Up to a rated heating output of 300 kW the low water indicator should be provided by means of a water level limiter or a suitable device see prDIN EN 12828 point 4 6 2 3 Minimum pressure limiter Recommended for flow temperatures in excess of 100 C Safety valve Equip the boilers to EN 12828 with a type tested safet...

Page 56: ...ox 0 1 bar 0 01 MPa higher than the pre charge pressure of the sealed expansion vessel However it must not exceed a maximum of 3 bar 0 3 MPa 7 9 Fuels This boiler has been developed for processing dry fuels This includes conditioned fuels high grade homogeneous quality fuels The com bustion system is suitable for the combustion of pellets and wood chips Suitable fuels This boiler is approved for t...

Page 57: ...points being observed However take additional precautions where there is a risk of oxygen ingress for example by adding oxygen binder sodium sulphite 5 10 mg litre into the excess The heating water should have a pH value between 9 0 and 10 5 Different conditions apply to systems that contain aluminium compo nents Where chemicals are used as part of the corrosion protection we rec ommend that the m...

Page 58: ...eating systems EN 13384 Chimneys Thermal and fluid dynamic calculation meth ods TRD 702 Equipment for steam boiler systems with class II hot water boilers Also observe EN 12953 in the case of Low pressure hot water boilers with safety temperatures 110 to 120 C EN 12953 1 Shell boilers General EN 12953 6 Shell boilers Requirements for equipment for the boiler EN 12953 7 Shell boilers Requirements f...

Page 59: ...ence to Building Regulations and any general recog nised technical rules to be observed The State Building Regulations their implementation orders and the combustion equipment ordinances as well as the general building inspectorate approvals and permits of the higher supervisory authority in individual cases are part of the Building Regulations require ments Appendix cont VITOLIGNO 300 H VIESMANN ...

Page 60: ...plication options 32 Overview 32 With agitators 33 With vacuum system 36 Fuel storage Pellet silo 48 Pellet storage room 42 H Halogenated hydrocarbons 51 Heating connections 54 Heating system Charging 56 I Immersion temperature controller 28 Installation Electrical 54 L Long distance heat line 24 Low water indicator 55 M Minimum clearances 52 Minimum pressure limiter 55 Minimum wood fuel requireme...

Page 61: ...or 25 Touchscreen 23 V Vacuum system 36 Vitotrol 200A 21 300 A 22 350 23 Vitotrol 350 23 W Water treatment 57 Woodchips 7 Classification to EN 14961 8 Classification to ÖNORM M 7133 7 Classification to QM Holzheizwerke 8 Quality characteristics 8 Requirements 8 Size classification 7 Keyword index VITOLIGNO 300 H VIESMANN 61 5672 507 GB ...

Page 62: ...62 VIESMANN VITOLIGNO 300 H ...

Page 63: ...VITOLIGNO 300 H VIESMANN 63 5672 507 GB ...

Page 64: ...cal modifications Viessmann Limited Hortonwood 30 Telford Shropshire TF1 7YP GB Telephone 44 1952 675000 Fax 44 1952 675040 E mail info uk viessmann com Viessmann Werke GmbH Co KG D 35107 Allendorf Telephone 49 6452 70 0 Fax 49 6452 70 2780 www viessmann com ...

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