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Product Manual

Gas Condensing Boiler

Ökotec 25

Aufstellungs- und

Bedienungsanleitung

Produktinformation

Summary of Contents for K4G1H24PX

Page 1: ...Product Manual Gas Condensing Boiler K4 Ökotec 25 Aufstellungs und Bedienungsanleitung Produktinformation ...

Page 2: ......

Page 3: ...ate Administration in the Energy Sectors and amending certain acts the Energy Act and ČSN 38 6405 change 1 5 99 EN 1775 to inspect the gas boiler on a regular basis once a year The inspections can be performed only by a contacted servicing organisation authorized by the manufacturer i e by STREBEL Ltd This firm is obliged to record and document on the implemented warranty and after warranty repair...

Page 4: ...eople with physical or mental impairments who are not able to safely operate the boiler should be supervised in order to ensure that they do not interact with the appliance In winter if leaving for a holiday for instance it is necessary to ensure the inspection of functionality of the boiler and the entire heating system in order to avoid possible water freezing as this may result in equipment dam...

Page 5: ... 6 2 Modes Of Operation 25 6 3 Lockout Condition Codes 27 6 4 Blocking Codes 29 6 5 Additional Functions 6 6 Open Therm Communication 31 6 7 Installer Mode 32 7 Maintenance 34 8 Installation 35 8 1 Possible Placement 8 2 Boiler Installation 36 8 3 Connection To The Heating System And Water Filling 8 4 Gas Connection 38 8 5 Electric Power Supply Connection 8 6 Condensate Discharge 38 8 7 Flue Gas D...

Page 6: ...egulation and safety components Low weight Equithermal boiler regulation Automatic anti freezing protection when connected to power supply 2 Boiler Versions In your order specify the order specification code K4 Name of boiler series Added specifics X1 Heat exchanger G stainless Steel X2 Water heating 1 without installed three way valve with a pump 2 three way valve pump HSW exchanger 3 with a thre...

Page 7: ... mm 80 60 Working water over pressure bar 3 Testing water overpres sure bar 5 Pressure loss See diagram 1 Maximum permitted working temperature C 85 Heating water setting range C 25 85 Hot water setting range C 35 60 35 60 Fuel connection pres sure mbar 20 37 20 37 20 37 Noise level dB 50 3 2 Boiler connection K4 24 kW Heating flow return Inch 3 4 Hot water flow Inch 1 2 1 2 Hot water return Inch ...

Page 8: ... nom heat input kW Q 22 8 Min nom heat input kW Q 4 6 DHW flow with ΔT l min See diagram 2 Boiler efficiency at nominal output 80 60 C Up to 98 Boiler efficiency at nominal output 50 30 C Up to 105 Volume flow rate of fuel m3 h 0 5 2 4 0 2 0 9 0 5 2 4 0 2 0 9 0 5 2 4 0 2 0 9 Mass flow rate of flue gas kg h 8 45 NOx class 5 Flue gas temp max C 85 3 3 Thermal Parameters K4 24 kW comparison condition...

Page 9: ...gas socket mm 80 60 Working water over pressure bar 3 Testing water overpres sure bar 5 Pressure loss See diagram 1 Maximum permitted working temperature C 85 Heating water setting range C 25 85 Hot water setting range C 35 60 35 60 Fuel connection pres sure mbar 20 37 20 37 20 37 Noise level dB 50 3 5 Boiler connection K4 33 kW Heating flow return Inch 3 4 Hot water flow Inch 1 2 1 2 Hot water re...

Page 10: ...m heat input kW Q 31 4 Min nom heat input kW Q 46 3 DHW flow with ΔT l min See diagram 3 Boiler efficiency at nominal output 80 60 C Up to 98 Boiler efficiency at nominal output 50 30 C Up to 105 Volume flow rate of fuel m3 h 0 68 3 3 0 28 1 28 0 68 3 3 0 28 1 28 0 68 3 3 0 28 1 28 Mass flow rate of flue gas kg h 11 62 NOx class 5 Flue gas temp max C 85 3 6 Thermal Parameters K4 33 kW comparison c...

Page 11: ...W Průtok TV l min K4G2H24 Ohřev TV T 30 C 7 00 9 00 11 00 13 00 15 00 17 00 19 00 21 00 23 00 2 50 3 50 4 50 5 50 6 50 7 50 8 50 9 50 Výkon kotle kW Průtok TV l min K4G2H24 Ohřev TV T 35 C Graph No 2 Dependence of boiler power on flow rate of heated hot water version VIADRUS K4G2H24XX K4G2H24 Hot water heating ΔT 25 C K4G2H24 Hot water heating ΔT 30 C K4G2H24 Hot water heating ΔT 35 C Boiler power...

Page 12: ...otle kW Průtok TV l min K4G2H33 Ohřev TV T 30 C 4 00 9 00 14 00 19 00 24 00 29 00 34 00 3 00 5 00 7 00 9 00 11 00 13 00 Výkon kotle kW Průtok TV l min K4G2H33 Ohřev TV T 35 C Graph No 3 Dependence of boiler power on flow rate of heated hot water version VIADRUS K4G2H33XX K4G2H33 Hot water heating ΔT 25 C K4G2H33 Hot water heating ΔT 30 C K4G2H33 Hot water heating ΔT 35 C Boiler power kW Boiler pow...

Page 13: ...emperature regime P4 24 kW At rated heat output and high temperature regime ƞ4 97 53 At 30 of rated heat output and low temperature regime P1 4 kW At 30 of rated heat output and low temperature regime ƞ1 105 72 Auxiliary electricity consumption Other items At full load elmax 0 02 kW Standby heat loss Pstby 0 045 kW At part load elmin 0 011 kW Ignition burner power consumption Pign kW In standby mo...

Page 14: ...t 30 of rated heat output and low temperature regime P1 4 kW At 30 of rated heat output and low temperature regime ƞ1 105 72 Auxiliary electricity consumption Other items At full load elmax 0 02 kW Standby heat loss Pstby 0 045 kW At part load elmin 0 011 kW Ignition burner power consumption Pign kW In standby mode PSB 0 003 kW Emissions of nitrogen oxides NOx 25 mg kWh For combination heaters Dec...

Page 15: ...t 30 of rated heat output and low temperature regime P1 4 kW At 30 of rated heat output and low temperature regime ƞ1 105 72 Auxiliary electricity consumption Other items At full load elmax 0 02 kW Standby heat loss Pstby 0 045 kW At part load elmin 0 011 kW Ignition burner power consumption Pign kW In standby mode PSB 0 003 kW Emissions of nitrogen oxides NOx 25 mg kWh For combination heaters Dec...

Page 16: ...temperature regime P4 30 3 kW At rated heat output and high temperature regime ƞ4 98 4 At 30 of rated heat output and low temperature regime P1 6 kW At 30 of rated heat output and low temperature regime ƞ1 104 8 Auxiliary electricity consumption Other items At full load elmax 0 11 kW Standby heat loss Pstby 0 044 kW At part load elmin 0 04 kW Ignition burner power consumption Pign kW In standby mo...

Page 17: ... At 30 of rated heat output and low temperature regime P1 6 kW At 30 of rated heat output and low temperature regime ƞ1 104 8 Auxiliary electricity consumption Other items At full load elmax 0 11 kW Standby heat loss Pstby 0 044 kW At part load elmin 0 04 kW Ignition burner power consumption Pign kW In standby mode PSB 0 003 kW Emissions of nitrogen oxides NOx 26 mg kWh For combination heaters Dec...

Page 18: ...heat output and low temperature regime P1 6 kW At 30 of rated heat output and low temperature regime ƞ1 104 8 Auxiliary electricity consumption Other items At full load elmax 0 11 kW Standby heat loss Pstby 0 044 kW At part load elmin 0 04 kW Ignition burner power consumption Pign kW In standby mode PSB 0 003 kW Emissions of nitrogen oxides NOx 26 mg kWh For combination heaters Declared load profi...

Page 19: ... PVC Servicing 10 2 Possible Placement The installation and operation of the boiler shall comply with all requirements of ČSN The boiler placement shall comply with the project documentation The flue gas exhau individual pipes for supply of combustion air and discharge of flue gases shall be located with a side of 50cm by the boiler The boiler can be placed on a wall with ensured loading ca At lea...

Page 20: ...lation pump 8 gas supply pipe 9 bleeder valve 10 boiler electronics 11 burner plate 12 heating water temperature sensor 13 mixer 14 safety thermostat 15 combination electrode 16 boiler frame 17 exchanger 18 fan 19 expansion tank 20 pressure gauge 21 boiler front cover Legend 1 Three way valve only for models K4G2H and K4G3H 2 HWS temperature sensor only for models K4G2H 3 HWS plate heat exchanger ...

Page 21: ...water heater 10 input of water to the flow type water heater 11 output of water from the flow type water heater 12 pressure relief valve Fig 6 VIADRUS K4G2HXXXX with a flow type heater hydraulic diagram of the version and the sketch of the hydro block 1 condensing exchanger 2 input of return water to the exchanger 3 pump 4 input of return water to the pump 5 heating system radiators 6 output of ho...

Page 22: ...ice 4 6 Instructions before Putting into Operation The boiler can only be commissioned by organizations that are authorized and trained for this purpose by the manufacturer The installation shall comply with the regulations that are applicable for this equipment The boiler shall be compatible with the local connecting conditions checking the parameters of the boiler with the information on the nam...

Page 23: ...difficult 18 Fig 8 A diagram showing flue gas flow in the exchanger 4 5 Delivery and Accessory The VIADRUS K4 boiler is delivered as assembled on a pallet packed in a carton cover Flue gas ducting is delivered in accordance with the customer requirements based on the actual connection of air inlet and flue gas outlet see chapter 11 Standard accessory for all boiler versions Mounting bracket 1 pc D...

Page 24: ...eration in DHW or CH mode and no error conditions it is always possible to enter the test mode as the higher priority mode of operation This implies that there are no error conditions present If there was an error condition test mode can be entered after normal operating conditions are present again OFF mode This is mode is selected by mean of the K5 push button When selected LCD is indicating K1 ...

Page 25: ...n Presetting CH supply temperature Operate K2 decrease and K1 increase pushbuttons to select CH supply temperature within 20 C and CH user set point maximum value This value is called CH user set point When K2 or K1 is pressed the displays the temperature setting in 1 C steps in flashing mode 5 sec since last acting on K2 or K1 has been made LCD come back to the previous display condition Presetti...

Page 26: ...losure of Room Thermostat contact generates an heat demand in CH mode Supply pump is switched on Flame indication is showing HD Flame ON power 30 HD Flame ON power 30 75 HD Flame ON power 75 If a higher priority operating demand is received the function in progress is stopped to meet this demand ON OFF control OTC no OpenTherm room unit Outdoor temperature sensor must be connected to the controlle...

Page 27: ...mand the temperature value read by the supply sensor is continuously moni tored 6 3 Lockout Condition Codes Lockout condition is given with the capital E error on the status display and error code on the temperature display Symbols or are being shown only in case of lockout condition which needs to be solved by Service people Error code Description E01 Ignition Lockout indication E02 False flame i...

Page 28: ... test executed at runtime fail that detect a major fault on electronic components E33 Return sensor out of normal operating range short circuit or open circuit If NTC sensor goes exceeds the range 00 125 C this error will be displayed In case sensor is back to normal operating range the lockout can be cleared by manual remote reset In error mode heat demands will be disabled In case two or more se...

Page 29: ...n is too high F41 Water filling auto is running F42 Water filling auto not completed F43 Low water pressure after auto water filling attempts F47 Water pressure sensor not connected F50 DHW solar storage tank BOTTOM sensor error only when DHW configuration is 2 or 4 F51 PT1000 temperature sensor error only when DHW configuration is 2 or 4 F52 DHW water temperature sensor error F53 Flue gas tempera...

Page 30: ...er filling automatic Auto water filling functionality is disabled if boiler is set in OFF mode F47 Water pressure sensor not connected In error mode the heat demand and the pumps are switched off Resolving this error situation can be achieved only if the sensor is connected again F50 DHW sensor out of normal operating range short circuit or open circuit If NTC sensor goes outside the range 5 125 C...

Page 31: ...a manual reset to reset to dismiss fault E03 High limit temperature protection 3 When the central heating water pressure is built up to the normal level after the fault F37 or fault F40 4 After a manual reset to dismiss fault F43 Nominal water pressure not reached within the defined time after a manual or automatic filling If there is no heat demand afterwards the controller will switch to standby...

Page 32: ...P After selecting tS the display starts with showing P00 By means of the K6 and K7 push buttons it is possible to select the parameters between P00 and P36 Selecting one of these parameters by means of the K1 and K2 push buttons it is possible to adjust its value not flashing A list of supported TSP is defined in to the System Parameters List and the default settings table see chapt 12 4 In case o...

Page 33: ...is mode after 2 minutes Inquiry mode can be activated also by holding i K3 for 10 sec 6 7 3 Hi As History Mode After selecting Hi the display shows H01 Using the buttons K6 and K7 it is possible to select the parameters After selecting one of these parameters use the buttons K1 and K2 to see its value not flashing i00 Supply sensor Temperature C 00 125 i01 Return sensor Temperature C 00 125 i02 DH...

Page 34: ...loth or by a cloth dipped in a detergent lotion Never use solvents or abrasive agents for cleaning of the boiler surface While checking the tightness of the gas distribution and the valve connection it is neces sary to be careful not to wet the coil of the gas valve All maintenance can be performed only by the contracted servicing organisation trained by the manufacturer The user is obliged to ens...

Page 35: ...ections and burning the gas oil and solid fuels EN 60445 ed 4 Basic and safety principles for man machine interface marking and identification Identification of equipment terminals conductor terminations and conductors EN 1775 Gas supply Gas pipework for buildings Maximum operating pressure less than or equal to 5 bar Functional recommendations EN 12007 1 Gas supply systems Pipelines for maximum o...

Page 36: ...o 400 mm The safe distance should be doubled also where the grade of material s reaction to fire has not been proven 8 2 Boiler Installation Using the installation stencil printed at the bottom of the carton packaging of the boiler attach the enclosed bracket to the wall using 3 pieces of dowels with diameter of 8 mm and bolts Mount the K4 boiler on the bracket and using the marked outlets the boi...

Page 37: ...Ø 25 3 hot water outlet 1 2 4 safety valve outlet Ø 21 2 5 filling valve 6 gas inlet 3 4 7 system water filling inlet hot water heating inlet 1 2 8 heating water inlet 3 4 1 heating water outlet 3 4 2 condensate outlet Ø 25 3 safety valve outlet Ø 21 2 4 gas inlet 3 4 5 filling valve 7 system water filling inlet 1 2 8 heating water inlet 3 4 1 heating water outlet 3 4 2 water inlet to the heater 3...

Page 38: ...recommend using a filter on the inlet to the heating system for water filling The heating system must have a sufficient number of venting points The lowest point of the heating system must be equipped with a drain valve 8 4 Gas Connection Prior to connecting the gas pipeline to the boiler the piping must be tested and subjected to revision inspection After connecting the boiler to the gas supply a...

Page 39: ...iler electrical equipment Fig 15 10 9 2 Connection of the higher level regulation and external boiler sensors Fig 16 Terminal for a boiler Outside sensor 10 kΩ THERMOSTAT Opentherm thermostat sensor TV 10 kΩ option K4G 3 flue gas temperature sensor exchanger sensor emergency thermostat output water sensor NORDGAS TPO1BH1REV fan FIME PX 118 K4GXH24XX PX 128 K4GXH33XX Hydroblock OTMA options combina...

Page 40: ...nection Parent control connection controller with communication OPENTHERM X201 2 X201 2 X201 2 Fig 17 VIADRUS K4G2HXXXX with through flow heater Connection of the connection terminal of the boiler without a parent control boiler standard supply Room thermostat connection Parent control connection controller with communication OPENTHERM X201 2 X201 2 X201 2 Fig 18 VIADRUS K4G3HXXXX in the boiler op...

Page 41: ...TAT BT1 EXCHANGER THERMAL FUSE BTr ROOM THERMOSTAT MV1 FAN PS1 WATER PRESSURE SENSOR P2 HW FLOW SENSOR Q1 PUMP Y100 GAS VALVE LEGEND A1 CONTROL BOARD WITH LCD SCREEN A6 ROOM INSTRUMENT OPENTHERM B2 HEATING WATER SENSOR B3 HOT WATER SENSOR B7 RETURN WATER SENSOR B8 FLUE GAS SENSOR B9 EXTERNAL SENSOR Boiler Wiring Diagram Extra Low Voltage 41 ...

Page 42: ...gas sensor 12 Safety thermostat 13 Return water sensor 14 Heating water sensor 15 DHW sensor 16 Water pressure sensor 17 Water flow sensor 18 Gas valve 22 Upper storage tank sensor 28 Connector for connecting the boiler 8 poles 29 Internal bonding connector 6 poles 30 Internal bonding connector 2 poles Fig 21 Boiler electrical equipment wiring diagram extra low voltage bk black bu blue bn brown rd...

Page 43: ... wiring diagram low voltage bk black bu blue bn brown gnye green yellow LEGEND A1 CONTROL BOARD WITH LCD SCREEN IOP IGNITION AND IONIZATION ELECTRODE MV1 FAN Q1 PUMP Y100 GAS VALVE Y3 THREE WAY VALVE X60 MV1 fan power connector X61 Q1 pump power connector X101 Euro connector the boiler power supply X110 bonding connector 43 ...

Page 44: ...CD screen 3 Fan 4 Pump 5 Three way valve 6 Ignition and Ionization electrode 7 External sensor 18 Gas valve 24 Euro connector the boiler power supply bk black bu blue bn brown gnye green yellow Fig 23 Boiler electrical equipment wiring diagram low voltage Boiler Electrical Equipment Wiring Diagram Low Voltage 44 ...

Page 45: ... the application and positioning of the built in fan in the boiler VIADRUS K4 is a boiler with a fan that is built in before the combustion chamber heat exchanger boiler body and is marked with 3 the second digit in the index Version C1 A boiler in version C whose ducting is connected to the protection inlet installed horizontally either on the outside peripheral wall or on the roof of the buildin...

Page 46: ...tion equipment on the ducts must not be placed on the opposite walls of the buil ding Version C8 A boiler in version C whose ducting or adapter is connected on the air supply side to the protection inlet and on the flue gas removal side to a separate or joint chimney The flue must be equipped with a special lining designed for condensing boilers and a condensate outlet from the chimney For the K4 ...

Page 47: ...ue gas ducting examples of incorrect connection of flue duct and air supply Fig 26 11 3 STARR D80 and FLEX 80 system connection Fig 27 1 reducing insert 2 transition piece 3 flue gas exhaust measuring piece 4 air intake pipe In case of using the flue gas exhaust with the diameter of 60 100 mm it is necessary to use reducing insert of the exchanger In case of using the flue gas exhaust with the dia...

Page 48: ...erminal pipe without socket Universal distance clamp Pipe with socket Inspection T piece Inspection door Pipe with socket Foot elbow starr 87 with anchoring LIB pipe piece with flange Inspection T piece Pipe with socket Inspection T piece with drainage Elbow 45 Inspection T piece with change of direction Inspection elbow 87 Boiler reducing piece centric Inspection T piece with drainage and change ...

Page 49: ...pipe without socket Terminal pipe flex Plastic chimney capital flex complete set Plastic chimney capital starr complete set Universal distance clamp Inspection door Ventilation grill Inspection T piece flex starr Inspection T piece flex flex Flexible pipe Adapter starr flex Foot elbow starr 87 with anchoring Inspection T piece with drainage and change of direction flex Long John siphon for overpre...

Page 50: ...of the exchanger In case that a fume pipe with the diameter of 80 125 mm is used it is necessary to demount this adapter Servicing 42 11 4 LIK 60 100 80 125 system connection For connection of the LIK 80 125 system it is necessary to use a 60 1 reducer piece 4 measuring piece 5 blinding plug D80 8 exchanger reducer piece Preparation of connection of the terminal part of the LIK system for c to the...

Page 51: ...shall be made by the designer in the technical documentation Note The quantity of the components for the individual version types depends on the placement of the boiler Plastic chimney capital starr complete set LIK pipe piece with flange Adjustable LIK pipe piece with clamp LIL wall clamp LIK inspection T piece with measuring opening LIK inspection T piece with drainage LIK elbow 45 LIK inspectio...

Page 52: ...80 Angle piece 87 1 2 1 9 PPRM18 80 Tube 1 m 2 5 3 6 Concentric Chimney Flue K4GXH24XX K4GXH33XX Code DN Name Loss in Pa LPBK45 60 100 Angle piece 45 5 3 7 8 LPBK95 60 100 Angle piece 87 7 5 11 1 LPRK15 60 100 Tube 1 m 21 9 32 8 LPZTK5 60 100 LIK T piece for air inlet 5 7 5 LPASK5 60 100 LIK tube piece for façade chimney flue 10 5 17 1 DPDS45 60 100 Roof extension a set 29 8 45 1 LPBK48 80 125 Ang...

Page 53: ... 8 bar It is necessary to open all closing valves and make sure that no gas is leaking Connect the boiler to the electric power supply Check the gas distribution line after the gas valve the safety valve function and pump operation During the operation of the boiler it is necessary to check removal of the condensate from the boiler and also from the chimney lining if applicable During the first st...

Page 54: ... silicon hose of ø 6 and a small container to protect boiler electronics from water leakage Loosen a screw at the valve If the system is being breathed air starts coming out from the exchanger At the moment when water starts coming out the exchanger is deaerated So the screw might be retightenend Repeat this procedure several times until the system is completely deaerated Automatic pump bleeder va...

Page 55: ...lve Adjusting Screw Servicing 12 2 Boiler Setting Boiler emissions Natural gas CO2 minimum boiler output CO2 value 8 5 nominal boiler output CO2 value 8 5 Propane CO2 minimum boiler output CO2 value 9 5 nominal boiler output CO2 value 9 5 When the set parameters do not correspond with the values shown above follow the instructions in the Servicing Manual Activation of the chimney sweeper function ...

Page 56: ...i tube 2 Clamp 3 Diaphragm 4 Ring 5 Gas supply 6 Gas valve Depending on the fuel type the connection between the gas supply 5 and the Venturi tube 1 is equipped with a diaphragm 3 Natural gas diaphragm diameter 6 7 mm Propane diaphragm diameter 4 3 mm Note 3 Sealing Note 5 Gas valve Software for propane fuel must be downloaded 12 4 Boiler Electronics Setting Setting parameters The product meets th...

Page 57: ...x x x x x x P18 Solar limit temperature 100 150 C x x x x x x P19 Solar storage tank limit temperature 50 100 C x x x x x x P20 Solar mode functionality 0 solar priority num x x x x x x 1 parallel P21 Heat demand delay after Solar pump activation 0 60 sec x x x x x x P22 Delta for virtual DHW user set point 0 30 C x x x x x x P23 CH user set point maximum 20 90 C 80 80 80 80 80 80 P24 CH maximum f...

Page 58: ...mit temperature 100 150 C x x x x x x P19 Solar storage tank limit temperature 50 100 C x x x x x x P20 Solar mode functionality 0 solar priority num x x x x x x 1 parallel P21 Heat demand delay after Solar pump activation 0 60 sec x x x x x x P22 Delta for virtual DHW user set point 0 30 C x x x x x x P23 CH user set point maximum 20 90 C 80 80 80 80 80 80 P24 CH maximum fan speed 150 635 rpm x 1...

Page 59: ...ney flue Attention Before you remove the boiler casing disconnect the boiler from the electric supply Servicing 13 Servicing Inspection of the Boiler The user is obliged ensure regular annual servicing inspections of the boiler When these conditions are not observed the owner cannot clam warranty repairs The instructions for the servicing inspection procedure is available for servicing organizatio...

Page 60: ...ional packaging unit EN 13429 NO 3 1 Recovery by material recycling ensure recyclability in all terms of the standard for the functional packaging unit EN 13430 YES 3 2 Recovery in the form of energy ensure that calorific gain is achievable for the functional packaging unit EN 13431 YES Iron NO 3 3 Recovery by composting ensure compost ability in all terms of the standard for the functional packag...

Page 61: ...d to Act No 477 2001 Coll and 185 2001 Coll as amended We recommend disposing the individual boiler parts as follows exchanger use the Scrap Materials pipe distributions use the Scrap Materials other metal parts use the Scrap Materials for the boiler frame insulation material use a contractor dealing with waste collection and disposal Upon losing the utility value of the product it is possible to ...

Page 62: ...ex to the Warranty Certificate for the Customer User A record of warranty and after warranty repairs and regular annual product inspections performed Date of entry Activity performed Contracted service organization signature stamp Customer s signature Annex 62 ...

Page 63: ...K4 Changes in models reserved Dimensions not binding Notes 63 ...

Page 64: ...NAK 1117 Strebel Ltd Unit 10 Invincible Road Farnborough Hampshire GU14 7QU UNITED KINGDOM Phone 44 0 1276 685 422 Fax 44 0 1276 685 405 Mail info strebel co uk Read more on www strebel co uk ...

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