Viessmann Vitocrossal CRU 1000 Service Instructions For Contractors Download Page 48 | Manualshive

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Parts lists

Casing assembly

5833296

Components

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Summary of Contents for Vitocrossal CRU 1000

Page 1: ...uctions for contractors VIESMANN Vitocrossal Type CRU 800 and 1000 kW Gas condensing boiler For open flue and room sealed operation Permissible operating pressure 6 bar VITOCROSSAL 5833296 GB 6 2018 Please keep safe ...

Page 2: ...cable standards a ÖNORM EN ÖVGW G K directives ÖVGW TRF and ÖVE c SEV SUVA SVGW SVTI SWKI VKF and EKAS guideline 1942 LPG part 2 Safety instructions for working on the system Working on the system Where gas is used as the fuel close the main gas shut off valve and safeguard it against unintentional reopening Isolate the system from the power supply e g by removing the separate fuse or by means of ...

Page 3: ...c distribution board Danger If water escapes from the appliance there is a risk of scalding Never touch hot heating water Condensate Danger Contact with condensate can be harmful to health Never let condensate touch your skin or eyes and do not swallow it Flue systems and combustion air Ensure that flue systems are clear and cannot be sealed for instance due to accumulation of conden sate or other...

Page 4: ...ss errors Displayed fault codes 39 Internal system faults Displayed fault codes and detailed fault codes 42 Faults without fault display 43 5 Parts lists Overview of assemblies 45 Boiler assembly 46 Casing assembly 48 MatriX Disk burner assembly 50 Burner control unit assembly 52 Vitotronic control unit assembly 54 6 Component overview Overview of burner components 56 7 Function description Air pr...

Page 5: ...on Not required during inspection Steps required during maintenance Not required during maintenance Intended use The appliance is only intended to be installed and operated in sealed unvented heating systems that comply with EN 12828 with due attention paid to the associated installation service and operating instruc tions as well as the details in the datasheet It is only designed for the heating...

Page 6: ...g output with modulating MatriX Disk burner for natural gas E and natural gas LL Permissible operating pressure for the heating sys tem 6 bar 0 6 MPa System examples For available system examples see www viessmann schemes com Information Product information 5833296 Information ...

Page 7: ... and heating surfaces 20 19 Cleaning the burner 22 20 Checking the burner door 22 21 Checking the burner gauze assembly 23 22 Checking the ignition electrodes and ionisation electrode 24 23 Fitting the burner 24 24 Closing the combustion chamber 24 25 Checking the gas train valves for tightness 25 26 Checking the gas train filter element 26 27 Checking the filter element in the gas line 26 28 Chec...

Page 8: ...ps Page 39 Checking the flue system for unrestricted flow and tightness 30 40 Checking the installation room ventilation air apertures 30 41 Instructing the system user 30 Commissioning inspection maintenance Steps commissioning inspection and cont 5833296 ...

Page 9: ...A B Fig 1 A Trap lower section B Condensate drain hose 1 Undo lower section of trap Fill the lower section with water Danger If the trap is not full flue gas can escape Escaping flue gas can cause life threatening carbon monoxide poisoning Always fill the trap with water before com missioning 2 Check that the condensate can drain freely 3 Refit lower trap section Commissioning inspection maintenan...

Page 10: ...imiter R D Safety connection safety valve R 2 E Boiler return 2 PN 6 DN 100 F Boiler return 1 PN 6 DN 100 G Drain outlet R 1 H Condensate drain R Check the connection for the sensor well and the mini mum pressure switch low water indicator for tight ness Commissioning inspection maintenance Checking the sensor well and all connections on the heating water side for tightness 5833296 ...

Page 11: ...e operated in the following Wobbe index ranges With natural gas E Wobbe index range 12 0 to 16 1 kWh m3 43 2 to 58 0 MJ m3 With natural gas LL Wobbe index range 10 0 to 13 1 kWh m3 36 0 to 47 2 MJ m3 2 In the delivered condition the burner is set up for natural gas E If required change the gas type set ting to natural gas LL See chapter Setting the gas type page 12 3 Record the gas type in the rep...

Page 12: ... CO2 content in the flue gas and adjust See page 16 Rated heating output Natural gas LL Natural gas E 800 kW 5 turns 4 turns 1000 kW 7 turns 6 turns Commissioning the system Danger CO build up as a result of incorrect burner adjustment or flue gas system leakage can have serious health implications Always carry out a CO test before and after work on gas appliances Vitotronic control unit operating...

Page 13: ... 1000 kW 4 mbar 0 4 kPa 6 Switch ON the mains isolator outside the installa tion room 7 Switch on the ON OFF switch at the programming unit of the control unit Vitotronic operating instructions Note During commissioning the appliance may enter a fault state due to remaining airlocks in the gas line Burner fault and are shown on the display Purge the gas line again Reset burner to acknowledge the f...

Page 14: ... under Service 4 S to confirm 1 is shown under Status The cur rent value for the maximum heating output in is shown under Service 5 Use or to select the required maximum heating output 6 S to confirm If adopted successfully 1 is shown under Service if it failed 0 will appear 7 S to change to the operating display 8 R the system will be restarted Checking the static pressure and supply pressure A F...

Page 15: ...s train is set to 15 mbar 1 5 kPa i e the burner cannot be operated at a gas sup ply pressure below 15 mbar 1 5 kPa Note Use a suitable measuring device with a resolution of at least 0 1 mbar 0 01 kPa to check the supply pressure 3 Record the actual value in the report 4 Switch off the ON OFF switch at the programming unit of the Vitotronic control unit 5 Close the gas shut off valve 6 Remove pres...

Page 16: ...he connecting points 02 Open the gas shut off valve 03 Activate emissions test mode Vitotronic control unit operating instructions 04 On the burner control unit hold down S simulta neously for longer than 2 s P is displayed under Status controlled stop The current modulation level in is shown under Service 05 To measure the CO2 set the upper and lower heating output in turn Upper heating output Pr...

Page 17: ... 1 Lower heating output 0 7 9 0 1 Natural gas LL Wobbe index Ws 10 0 to 13 1 kWh m3 0 C 1013 25 mbar Upper heating output 100 8 8 0 1 Lower heating output 0 7 8 0 1 Measuring the CO content Enter the actual value in the service report Measuring the flue gas temperature Enter the actual value in the service report Checking the ionisation current Note The ionisation current can only be called up via...

Page 18: ...erating display Shutting down the system 1 Isolate the system from the power supply e g by removing the separate fuse or by means of a mains isolator and check that it is no longer live Safeguard the system against reconnection Danger An electric shock can be life threatening Before opening the boiler disconnect it from the mains voltage e g at the fuse or mains isolator 2 Close the gas shut off v...

Page 19: ...19 1 2 4 3 2x Fig 10 Commissioning inspection maintenance Opening the boiler 5833296 ...

Page 20: ...tion chamber Cleaning the combustion chamber and heating surfaces Please note Scratches inside the combustion chamber or on components that come into contact with flue gas can lead to corrosion damage Only clean with synthetic brushes never use wire brushes or sharp objects Never place tools or other objects inside the combustion chamber To clean thoroughly flush the heating surfaces with a jet of...

Page 21: ...uch 600 Remove coatings and surface discolouration yellow brown with slightly acidic chloride free cleaning agents based on phosphoric acid e g Antox 75 E Remove loose deposits from the boiler thoroughly flush the heating surfaces and the flue gas collector with a water jet Cleaning agent manufacturer s instructions Recommendation Fauch 600 and Antox 75 E Manufacturer Hebro Chemie GmbH Rostocker S...

Page 22: ...lly clean the fitting with swirl plate A Carefully vacuum burner gauze assembly B from inside Remove any dirt with compressed air Do not damage the mesh of the burner gauze assembly Checking the burner door 1 Check the gaskets and packing cords in the burner door for damage 2 Check the thermal insulation components on the burner door for damage Commissioning inspection maintenance Cleaning the bur...

Page 23: ...the burner gauze assembly A B Fig 13 1 Check burner gauze assembly A and thermal insulation block B for damage 2 If a component is visibly damaged replace the component Installation instructions Replacing burner components Commissioning inspection maintenance Checking the burner door cont 5833296 ...

Page 24: ...Danger Leaks can result in poisoning through escaping gas Ensure that all gaskets are seated correctly Please note Mechanically loaded connections lead to leaks and appliance damage Ensure the intake extension and gas connection are kept free of load and torque stress Danger Escaping gas leads to a risk of explosion Check the fittings and the gasket between the fan casing and the burner door for g...

Page 25: ...r tightness B A Fig 16 1 Close the gas shut off valve 2 Undo screw in test connector B Do not remove the screw 3 Connect the pressure gauge at test connector B 4 Using the pressure gauge carefully build a test pressure of approx 50 mbar 5 kPa 5 Wait approx 5 min for the temperature to level out Then observe the display on the pressure tester The gas train is gas tight if the displayed pressure doe...

Page 26: ... train in reverse order using new gaskets 4 Check for gas tightness Danger Escaping gas leads to a risk of explosion Check the gas train for gas tightness Please note The use of leak detection spray can result in faulty operation Leak detection spray must not come into contact with electrical contacts Note Only use suitable and approved leak detection agents EN 14291 and devices for the tightness ...

Page 27: ...s of the leak detection agent after test ing Cleaning the condensate drain pipe and trap Note Clean the condensate drain pipe and trap at least once a year A B Fig 17 1 Disconnect neutralising system condensate drain hose B from trap A 2 Connect the cleaning hose to the trap and route it to the drainage system 3 Clean the inside of the condensate drain pipe hose pipes and trap A 4 Fill the lower s...

Page 28: ...nsion vessel and reduce the pressure in the expansion vessel 2 If the expansion vessel pre charge pressure is lower than the static system pressure top up with nitrogen Top up with nitrogen until the pre charge pressure is 0 1 to 0 2 bar 10 to 20 kPa higher 3 Top up with water The charge pressure of the cooled system must be 0 1 to 0 2 bar 10 to 20 kPa higher than the pre charge pressure of the ex...

Page 29: ...nsor and plug in connection B for correct seating 3 Check gasket C with the boiler flue connection for tightness If necessary replace the gasket Performing final checks Enter the actual values into the report Checking the safety valve function Checking the mixer for ease of operation and leaks 1 Remove the motorised lever from the mixer han dle 2 Check the mixer for ease of operation 3 Check the m...

Page 30: ...es Check that the vent is unobstructed and free from con tamination in the case of open flue operation Instructing the system user The system installer should hand the operating instruc tions to the system user and instruct the user in oper ating the system This includes all components installed as accessories e g remote control units In addition the system instal ler must make the user aware of t...

Page 31: ...l unit operating instructions Operating display The operating display indicates the operating status start and test functions during burner start both dur ing standard operation and after pressing reset button R following fault rectification Only adjust settings and carry out scans on the burner control unit when in standby Fault indication See fault codes from page 39 onwards The operating displa...

Page 32: ...ce See table below 3 S to confirm the number of the selected menu is shown under Status 4 repeatedly until the required sub menu is shown under Service See following chapter 5 S to confirm the number of the selected sub menu is shown under Status and the value relating to the scan or configuration appears under Service If no other key is pressed within 20 s the setting or scan is automatically ter...

Page 33: ...is shown under Service if it failed 0 is shown 7 S to change to the operating display Changing the configuration The following configurations can be carried out Menu 5 Temporarily display an item of process information in the operating display Note Pressing reset button R or switching the power con nection off and on again will return the operating dis play to the default display showing the start...

Page 34: ...o not adjust 7 Motorised flue gas damper 0 without flue gas damper 1 with flue gas damper 0 8 Characteristics of burner control units when gas pressure is too low 0 interlocked 1 blocked 1 9 Burner start temperature differential ef fective during minimum pause 0 to 20 K 6 K A Burner stop temperature differential ef fective during minimum pause 0 to 20 K 6 K 0 Reset all operating parameters to thei...

Page 35: ...o change to the operating display Setting the modulation level for manual operation The modulation level can be temporarily adjusted for carrying out tests and settings on the gas train e g setting the max heating output range During this manual operation the demands from the Vitotronic control unit have no effect To call up the service display the burner must be run ning Press the following keys ...

Page 36: ... 6 8 U System start Relay test Start up Operation Shutdown Fault states 9 7 C Waiting Standby F6 10 11 Code Enable plug 152 T2 P Operation with flue gas damper Demand CAN bus Enable plug 152 T2 Operation without flue gas damper Plug 100 Blocking fan output plug 152 S3 Gas pressure switch1 Outputs L Signal change Assessed subject to output Output active L Subject to heat demand Fuel valve BV1 Fig 2...

Page 37: ...me signal amplifier test max 50 s Gas fan and air pressure switch test max 20 s 2 Fan ramp up max 15 min 3 Pre purge 30 s Adjust start up load WD 1 test 25 s 4 Pre ignition 1 s 5 Safety time max 2 6 s Operation 6 Flame stabilising time 15 s 7 Start up partial load 12 s Modulating operation 0 to 24 h Adjust shutdown load 10 s Shutdown 8 Reheating WD 2 test 1 s max 30 s Fan ramp up post purge max 20...

Page 38: ...m ory may give an indication of the cause Calling up the fault memory Press the following buttons 1 S longer than 2 s flashes 2 until 4 is shown under Service 3 S to confirm 4 is shown under Status 1 is shown under Service 4 for the required fault memory See the table below 5 S to confirm the selected fault memory is shown under Status 6 to scroll through the fault codes 7 S to change to the opera...

Page 39: ...5B dual sensor Replace sensor if re quired F 88 Burner control unit in a fault state Lead break boiler water temperature sensor Check connecting cable and boiler water temperature sensor 3A 3B dual sensor Replace sensor if re quired F 89 Burner control unit in a fault state Flue gas temperature sen sor disconnection Check connecting cable and flue gas temperature sensor 15A 15B dual sensor Replace...

Page 40: ...nce with the rated boiler heating output See Specification for connected values F F2 Burner control unit in a fault state system cools down Boiler water temperature limiter has responded Boiler water temperature too high Wait until temperature falls below the permissible boiler water tem perature Reset burner control unit F F3 Ionisation flame monitor re ports faulty flame signal dur ing start up ...

Page 41: ...ondensate Reset the burner control unit Re place hose F F6 Gas pressure switch reports no gas pressure Gas shut off valve closed gas pressure switch faulty multiple problems with gas supply Open the gas shut off valve Check gas flow pressure Replace gas fil ter if required Reset the burner control unit Replace gas train F F7 Fan pressure is created dur ing the idle state check of air pressure swit...

Page 42: ...ck motorised flue gas damp er operating parameters Internal system faults Displayed fault codes and detailed fault codes Internal system faults will be shown if the correct pro gram sequence can no longer be guaranteed Displayed fault code System characteristics Cause Measures F E5 F EC F ED F FF Fault in burner control unit area Internal system fault and EMC Reset burner control unit Replace the ...

Page 43: ... module 3B Air pressure switch 2 For type CM3C only High switching se quence switch flutters External voltage Check flue gas path and reheating surfaces Check air pressure switch 2 setting 60 Hall signal fan feed back RM N Fan speed too high In correct fan or incorrect coding card Check the fan Check coding card Faults without fault display Fault Cause of fault Measure Combustion faults due to pul...

Page 44: ... Remove flange Clean strainer See page 26 Flue gas temperature too high Excessive gas throughput Adjust gas throughput in accordance with the rated boiler heating output Checking the condition of the heating surfaces Clean if necessary Troubleshooting Faults without fault display cont 5833296 Diagnosis ...

Page 45: ...from this parts list Position number of the individual part within the assembly from this parts list 0001 0003 0004 0002 A Fig 23 0001 Boiler assembly 0002 Casing assembly 0003 MatriX Disk burner assembly 0004 Vitotronic control unit assembly Parts lists Overview of assemblies 5833296 Components ...

Page 46: ...46 0001 0002 0003 0005 0007 0006 0005 0008 0001 0001 0004 Fig 24 Parts lists Boiler assembly 5833296 Components ...

Page 47: ...asket DN 100 PN 6 0002 Sensor well with clip 0003 Packing cord 0004 Gasket set 0005 Sealant 0006 Flue gas collector with gasket 0007 Flue system collar 0008 Stench trap Parts lists Boiler assembly cont 5833296 Components ...

Page 48: ...10 0028 0027 0013 0013 0013 0009 0004 0001 0012 0030 0029 0017 0038 0039 0022 0018 0019 0011 0008 0008 0007 0007 0006 0006 0005 0005 0002 0037 0036 0035 0023 0026 0032 0033 0034 0039 0038 0016 0040 Fig 25 Parts lists Casing assembly 5833296 Components ...

Page 49: ...ension bottom right 0017 Rail bottom left 0018 Rail bottom right 0019 Side panel front left 0020 Centre side panel 1 left 0021 Centre side panel 2 left 0022 Side panel back left 0023 Side panel front right 0024 Centre side panel 1 right 0025 Centre side panel 2 right 0026 Side panel back right 0027 Front panel 0028 Control unit panel 0029 Top panel front 0030 Top panel left 0031 Top panel right 00...

Page 50: ...0022 0008 0018 0023 0019 0016 0023 0012 0010 0004 0008 0010 0015 0005 0015 0002 0011 0014 0013 0006 0016 0007 0017 0021 0020 0003 0009 0001 Fig 26 Parts lists MatriX Disk burner assembly 5833296 Components ...

Page 51: ...ector 0009 Gasket gas fan 0010 O ring gasket 0011 Ignition cable 0012 Additional cover 0013 2 2 way solenoid valve 0014 Ignition module 0015 Gasket 0016 Clip 0017 Hose set 0018 Coding card 0019 Intake extension 0020 Small parts burner 0021 Fixing parts 0022 Connection piece gas train 0023 Fixing parts intake extension Parts lists MatriX Disk burner assembly cont 5833296 Components ...

Page 52: ...52 0019 0017 0018 0016 0015 0014 0013 0012 0011 0010 0009 0006 0005 0004 0003 0002 0001 Fig 27 Parts lists Burner control unit assembly 5833296 Components ...

Page 53: ...witch with connecting cable 131 0010 Air pressure switch with connecting cable 131A 0011 Sensor lead 0012 Cable control unit programming unit 0013 Cable flue gas temperature sensor 15 0014 Connecting cable control unit GFA 0015 Cable CAN bus 72 0016 Cable flue gas damper 53 0017 Dual temperature sensor 0018 Cable harness CAN bus programming unit 0019 Fan motor connecting cables Parts lists Burner ...

Page 54: ...54 0017 0019 0009 0014 0016 0012 0010 0002 0001 0003 0003 0004 0011 0013 0007 0018 0006 0008 0003 0002 Fig 28 Parts lists Vitotronic control unit assembly 5833296 Components ...

Page 55: ...e 0008 Vitocrossal junction box 0009 Coding card 0010 Cover cable entry 2 pce 0011 Control board CU404 0012 Power board MB205 0013 PCB CU103 controller board extension 0014 Strapping plug X6 0016 Fuse 6 3 A slow 250 V 10 pce 0017 PCB IU100 B10 0018 LON connecting cable length 7 m 0019 LON terminator 2 pce Parts lists Vitotronic control unit assembly cont 5833296 Components ...

Page 56: ...s pressure switch 2 G Gas supply pipe H Intake extension K Fan L Supply air collector M Thermal insulation block N Ignition electrodes O Burner gauze assembly MatriX Disk P Ionisation electrode R Ignition unit S Air pressure switch LDW2 T Air pressure switch LDW1 U 2 2 way solenoid valve Component overview Overview of burner components 5833296 Functions ...

Page 57: ...nitoring function LDW2 To monitor the combustion chamber pressure the switching threshold of air pressure switch 2 plug aCAA is monitored in all operating phases except dur ing safety and stabilising time If the combustion chamber pressure lies outside the permissible range air pressure switch 2 triggers a fault shutdown on the burner control unit The combustion chamber pressure lies outside the p...

Page 58: ...y solenoid valve G Flue gas damper H Ignition unit K Fuel valve BV1 L Fuel valve BV2 M Display and programming unit N Gas pressure switch GDW2 O Air pressure switch 1 P Gas pressure switch GDW1 R Air pressure switch 2 S Flue gas temperature sensor 2 T Flue gas temperature sensor 1 U Boiler water temperature sensor 2 V Boiler water temperature sensor 1 W Fan motor with PWM switching and feedback Co...

Page 59: ...fill water and the water hardness into the boiler maintenance checklists For systems with a specific system volume greater than 20 l kW heating output apply the requirements of the next higher category of total heating output in accordance with the table In multi boiler systems apply the output of the smallest boiler In the case of severe overshoot 50 l kW soften the water down to a total of alkal...

Page 60: ...d systems operating at the correct pressure e g systems with expansion ves sel offer good protection against the ingress of air borne oxygen Under all operating conditions and at all points in the heating system including the intake side of the pump the pressure must be higher than atmos pheric pressure Check the pre charge pressure of the expansion vessel at least during the annual service Avoid ...

Page 61: ...61 Fill water report Fill water Top up water Meter reading Total water volume Date m3 m3 m3 m3 Max fill volume m3 Reports Reports 5833296 ...

Page 62: ... kPa Supply pressure flow pressure Natural gas E mbar kPa Natural gas LL mbar kPa Tick gas type Carbon dioxide content CO2 At the upper rated heat ing output Actual by vol Set by vol At the lower rated heat ing output Actual by vol Set by vol Oxygen content O2 At the upper rated heat ing output Actual by vol Set by vol At the lower rated heat ing output Actual by vol Set by vol Carbon monoxide con...

Page 63: ...ng Maintenance Service Flue gas temperature gross Actual C Set C Ionisation current At the upper rated heat ing output μA At the lower rated heat ing output μA Draught Actual hPa Set hPa Reports Reports cont 5833296 ...

Page 64: ...ength of the heat exchanger module mm 1272 1272 Width mm 960 960 Height mm 1676 1676 Total dimensions incl casing Length mm 3187 3389 Width mm 1060 1060 Height mm 1676 1676 Foundation dimensions Length mm 2500 2700 Height mm 1200 1200 Weight Combustion chamber module kg 535 585 Heat exchanger module kg 615 615 Burner kg 120 120 Total weight dry kg 1435 1492 Water capacity l 1150 1180 Connections B...

Page 65: ... h 1273 1592 At partial load kg h 237 297 Flue gas connection 7 mm 300 300 Draught at the flue outlet Pa 70 70 mbar 0 7 0 7 Flue gas volume m3 0 45 0 50 Efficiency Hs at TF TR 80 60 C full load 100 88 88 Hs at TF TR 50 30 C full load 100 96 95 Hs at TF TR 50 30 C partial load 30 98 97 Standard seasonal efficiency to DIN Hs at 40 30 C 99 98 Hs at 75 60 C 96 96 Idle losses via ambient temperature 50...

Page 66: ...up to mean sea level MSL 1500 m kW 127 to 762 159 to 952 Burner type MDI Burner product ID CE 0085CS0412 Voltage 3 N PE V 400 400 Frequency Hz 50 50 Current max A 16 16 Power consumption At rated heating output W 1500 2000 At partial load W 100 100 Gas supply pressure Natural gas E and natural gas LL mbar kPa 18 to 25 1 8 to 2 5 Sound power level to EN 15036 dB A 83 85 Specification Specification ...

Page 67: ...re not part of ordi nary household waste For decommissioning the system isolate the system from the power supply and allow components to cool down where appropriate All components must be disposed of correctly Final decommissioning Final decommissioning and disposal 5833296 Appendix ...

Page 68: ...e following website www viessmann co uk eu conformity Manufacturer s certificate according to the 1st BImSchV Germany We Viessmann Werke GmbH Co KG D 35107 Allendorf confirm that the product Vitocrossal type CRU complies with the following conditions stipulated by the 1st German Immissions Order BImSchV NOx limits in accordance with paragraph 6 1 Flue gas loss up to 9 in accordance with paragraph ...

Page 69: ...ustion chamber cleaning 20 Combustion chamber opening 20 Combustion chamber pressure monitoring 57 Combustion operation service display 35 Component overview burner 56 Condensate drain checking 28 Condensate drain pipe cleaning 27 Configuration changing 33 Connection diagram 58 D Decommissioning 67 Delivered condition resetting 35 Description of state 36 Diagnostics table 39 Displayed fault codes ...

Page 70: ...n 6 R Report Fill water 61 Settings and measurement values 62 Water quality 62 S Safety valves checking 29 Spare parts 45 Specification 64 Start and test functions during burner start 31 36 Static pressure checking 14 Supply pressure checking 14 Symbols 5 System Commissioning 12 Filling and venting 9 Shutting down 18 System examples 6 System pressure checking 28 System user instruction 30 T Therma...

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Page 72: ... 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 5833296 Subject to technical modifications ...

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