Viessmann VITODENS 200 WB2A Installation & Servicing Instructions Manual
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Viessmann VITODENS 200 WB2A Installation & Servicing Instructions Manual

Fully automatic fan assisted balanced flue condensing combination & system boiler for use with natural gas or propane.
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VITODENS 200
WB2A
INSTALLATION & SERVICING INSTRUCTIONS
Fully automatic fan assisted balanced flue condensing
Combination & System boiler for use with Natural Gas or Propane.

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  • Page 1 VITODENS 200 WB2A INSTALLATION & SERVICING INSTRUCTIONS Fully automatic fan assisted balanced flue condensing Combination & System boiler for use with Natural Gas or Propane.

  • Page 2: Table Of Contents

    Contents Section 1 General Information ........3-4 Section 2 Technical Specifications .

  • Page 3: General Information

    1 General Information 1.1 Appliance Description Appliance gas council numbers: 47-819-06 Vitodens 200 WB2A 26kW Combi 41-819-11 Vitodens 200 WB2A 26kW System The Vitodens 200 is a fully automatic, wall hung, fan assisted balanced flue condensing system and combination boiler for use with Natural Gas (G20) or Propane (G31). The appliance incorporates a microprocessor based fully modulating gas control system with direct burner ignition.

  • Page 4: Technical Specifications

    1 General Information 1.2 Certification Details The Vitodens 200 is certified to comply with the requirements of EN 483 and EN 625 for use in GB and IE (Great Britain and Ireland) using gas category 2H (G20 with a governed gas supply at 20 mbar (8 in.wg) inlet pressure) or 3P (G31 with a supply pressure of 37mb(14.5in wg)).

  • Page 5: General Specifications

    2 Technical Specifications 2.2 General Specifications Boiler Model Combi System Main burner gas restrictor 6.2mm 6.2mm Total water capacity (Including expansion Vessel) 11litres 10.5litres Minimum CH system pressure (static head) – Cold 0.8 bar (11.6psi) 0.8 bar (11.6psi) Maximum CH system pressure (static head) – Hot 3 bar (43psi) 3 bar (43psi) Empty weight...

  • Page 6: Minimum Installation Clearances

    2 Technical Specifications Connection Sizes Combi System Rc 1/2 (Female) Rc 1/2 (Female Central heating flow Rc 3/4 (Female) Rc 3/4 (Female) Central heating return Rc 3/4 (Female) Rc 3/4 (Female) Domestic water inlet Rc 1/2 (Female) Domestic water outlet Rc 1/2 (Female) Pressure relief valve outlet Rc 3/4 (Female)
  • Page 7 2 Technical Specifications 2.5.2 Concentric Vertical Flue Systems The vertical flue kit (optional extra) with extensions may be used to provide a straight length of up to10 m (393 in) and include two 87° elbows or three 45° elbows. An extra 87° elbow can be used but this reduces the maximum permissible length by 1 m (40 in).
  • Page 8 2 Technical Specifications 2.6 Hydraulic Circuit Figure 2/B: Hydraulic Circuit...
  • Page 9 2 Technical Specifications 2.7 Sectional Diagram Figure 2/C: Sectional Diagram (Combi Boiler Illustrated)

  • Page 10: Installation Requirements

    3 Installation Requirements 3.1 Statutory Requirements GAS SAFETY (INSTALLATION AND USE) REGULATIONS (CURRENT ISSUE) It is the law that all gas appliances are installed by a registered person, in accordance with the above regulations. Failure to install appliances correctly could lead to prosecution. It is in your own interest and that of safety, to ensure that the law is complied with.
  • Page 11 3 Installation Requirements 3.2 Boiler Position The following limitations MUST be observed when siting the boiler: If the boiler is to be fitted in a timber framed building it should be fitted in accordance with the institute of gas engineers publication IGE/UP/7 "Gas installations in Timber Framed Buildings".
  • Page 12 3 Installation Requirements Position Minimum Spacing Horizontally from a terminal on same wall 300mm 12in Adjacent to opening 300mm 12in Below carport 200mm From adjacent wall 300mm 12in From adjacent opening window 1000mm 40in From another terminal 600mm 24in Minimum height 300mm 12in Figure 3/A: Flue Termination Position...

  • Page 13: Flue Terminal Location

    3 Installation Requirements 3.3 Flue Terminal Location Detailed recommendations for flue installation are given in BS 5440:1. The following notes are for general guidance. The boiler MUST be installed so that the terminal is exposed to external air. It is important that the position of the terminal allows free passage of air across it at all times.

  • Page 14: Ventilation Requirements

    3 Installation Requirements 3.4 Ventilation Requirements Detailed recommendations for air supply are given in BS 5440:2. The following notes are for general guidance. It is not necessary to have a purpose provided air vent in the room or internal space in which the appliance is installed. If the boiler is to be installed in a cupboard or compartment, no permanent air vents are required for cooling purposes in the cupboard or compartment, however, it is essential to ensure that the minimum...
  • Page 15 3 Installation Requirements Figure 3/C: Typical System Design (System Boiler - 4 Pipes) Note: The boiler incorporates an internal bypass to ensure adequate water flow, however one radiator (preferably in the bathroom) should be permanently open (fitted with two lockshield valves) to dissipate any excess heat.
  • Page 16 3 Installation Requirements Figure 3/D: Typical System Design (System Boiler - 2 Pipes) As shown above as a fully pumped system for heating and hot water using only 2 pipes from • boiler, the boiler will require the hot water pipes capping off and a permanent live feed via plug 40 with the system demand being connected to the boiler via plug 96.

  • Page 17: Central Heating System

    3 Installation Requirements Figure 3/E: Typical System Design (System Boiler - CH Only) 3.5 Central Heating System These appliances are designed for connection to sealed central heating water systems. Refer to Figure 3/B - 3/E for typical system designs. A sealed system must only be filled by a competent person. A filling loop is supplied as part of the installation kit, therefore no special connections are needed within the system.
  • Page 18 3 Installation Requirements 3.5 Central Heating System PUMP The available head shown in figure 3/F is that in excess of the appliance hydraulic resistance, i.e that available for the system. EXPANSION VESSEL The table below shows the maximum system volume that the integral expansion vessel can sustain under different charge pressure conditions.

  • Page 19: Gas Supply

    3 Installation Requirements 3.6 Domestic Hot Water System (Combi Boiler Only) Check that the mains water pressure is sufficient to produce the required DHW flow rate, but does not exceed the maximum DHW pressure (10 bar). If necessary, a pressure reducing valve must be fitted to the mains supply before the DHW inlet connection.

  • Page 20: Electricity Supply

    3 Installation Requirements 3.7 Gas Supply The governor at the meter must give a constant outlet pressure of 20 mbar (8 in.wg) when the appliance is running. Alternatively for LPG appliances the supply pressure should maintain 37 mb (14in wg) The gas supply line should be purged.

  • Page 21: Installation Procedure

    4 Installation Procedure 4.1 Unpacking the Appliance The appliance is supplied as standard in 2 separate packages. Any optional extras are supplied individually. Check the availability and contents of each package before commencing the installation. Boiler package: Boiler (assembled) Wall mounted template (paper) Wall mounted pipework connections Installation package: Flue duct comprising standard horizontal terminal assembly.
  • Page 22 4 Installation Procedure Figure 4/A: Determining the position of the flue duct hole corner of wall 239mm wall template position of side flue corner of wall Figure 4/B: Wall template connections (detail)
  • Page 23 4 Installation Procedure Figure 4/B: Full Wall template...

  • Page 24: Fitting The Boiler

    4 Installation Procedure 4.2.2 Fitting the Flue Support Bracket Fix the flue support bracket to the wall using the screws provided as shown in Figure 4/C. 4.2.3 Fitting the Connection Adapters Assuming that the service connections are to be completed using copper pipework, fit the threaded connectors (supplied) to the pipe connections as appropriate.
  • Page 25 4 Installation Procedure Figure 4/D Ensure that the two outermost compression coupling nuts on the piping frame are slackened but in position with their olives aligned. Lift the boiler in a vertical attitude (two persons will be needed for this task) and offer the boiler against the wall mounting frame entering the two 22 mm vertical flow and return pipes into the compression couplings on the piping frame before lowering the boiler onto the two supporting lugs...

  • Page 26: Making The Water Connections

    4 Installation Procedure 4.3 Fitting the Boiler Open the lower hinged controls cover. Disconnect the fixing clips at the side of the control pod and hinge the pod forwards. Tighten the CH compression couplings. Connect the DHW inlet and outlet couplings by inserting a sealing washer (supplied) and lifting the nut to engage with the thread, tighten both nuts to make a watertight seal.

  • Page 27: Connecting The Gas Supply

    4 Installation Procedure Figure 4/E: Key - Boiler Service Connections Combi System Central heating flow Central heating flow Hot water outlet (Combi only) DHW cylinder flow (if required) Gas connection Gas connection D Cold water inlet (Combi only) D DHW cylinder return (if required) Central heating return Central heating return Drain valve connection...
  • Page 28 4 Installation Procedure 4.7 Flue System Preparation 4.7.1 Horizontal Flues (Rear and Side Flues). Note: Cut both inner and outer ducts flush and square, remove any burrs or sharp edges. Cut only the opposite end to the discharge terminal. If the flue requires extending where L > 640mm then L – 560 – 80 + 40 will equal the minimum total length of extension duct required.
  • Page 29 4 Installation Procedure 4.7.2 Vertical Flue Systems Accurately measure the required flue length ‘H’ as shown, ensuring that a minimum of 400 mm is maintained above the roof line. If this distance is 1207mm or less, no further extensions will be required. Refer to Figure 4/G. Where an extension is required the total length of the flue can be calculated H –...

  • Page 30: Fitting The Flue System

    4 Installation Procedure 4.8 Fitting the Flue System 4.8.1 Horizontal Flue Systems Refer to Figure 4/H. Note that the flue can be installed prior to the boiler (if desired) because the flue support bracket if used will hold the flue system in place. Install the flue system as follows: Step 1: Push the adaptor into the top half of the spigot at the top of the boiler as shown.
  • Page 31 4 Installation Procedure 4.8.2 Vertical Flue Systems Refer to Figure 4/I. Note that the flue can be installed prior to the boiler (if desired) because the flue support bracket supplied as an optional extra will hold the flue system in place. Install the flue system as follows: Figure 4/I: Installing a vertical flue system Step 1: Push the adaptor into the top half of the spigot at the top of the boiler as shown...

  • Page 32: Wiring Instructions

    4 Installation Procedure 4.8.3 Flue Systems with Additional Elbows If the flue system incorporates additional 90° or 45° elbows the procedure for adding the elbows into the system is exactly the same as for extension ducts. Measurements to be used for such purposes are given in Figure 4/J. Dimension (mm) Figure 4/J: Dimensions of Additional elbows for use in Flue Systems 4.9 Wiring Instructions...

  • Page 33: External Controls

    4 Installation Procedure 4.9.1 Electrical Connections It is important that the Live (L) and Neutral (N) are not interchanged. A two pole shut off switch with a contact separation of at least 3 mm MUST be fitted in the mains supply to the boiler with a maximum fuse value of 3A Route the main cable through one of the cable glands at the rear of the controls pod to the mains connection terminal (40) the brown wire being connected to terminal (L), the blue wire to (N) and the green / yellow to (E) ensuring that the earth (green / yellow) is longer that the live...
  • Page 34 4 Installation Procedure 4.10 External Controls Alternatively connect programmer /room thermostat terminal (96) in accordance with Fig 4/M after removing link between L and 1 routing wiring through one of the strain relief clamps. Figure 4/M: Other Accessories (Room Thermostat and / or Time Clocks) External controls should be connected to the appliance as follows: Volt free switching contacts (e.g across clock switch) should be connected between ‘L and 1’...

  • Page 35: Condensate Drain Connection

    4 Installation Procedure 4.11 Condensate Drain Connection Route the condensate drain via a tundish or other suitable vented pipework to a suitable drain. Ensure that the drainage pipework has a minimum fall of 1 in 20 away from the boiler. All pipework must be of plastic and must not be reduced in diameter throughout its length.

  • Page 36: Commissioning And Testing

    5 Commissioning and Testing Before commissioning the appliance, the whole gas installation including the meter MUST be purged and tested for gas soundness in accordance with BS 6891: 1988. IMPORTANT: Open all doors and windows; extinguish naked lights and DO NOT SMOKE whilst purging the gas line. Before commencing the commissioning procedure, ensure that the gas service cock is turned on, the electricity supply is isolated and that the DHW and CH pipework is complete.

  • Page 37: Venting The Boiler

    5 Commissioning and Testing 5.1 Filling the Central Heating Circuit NOTE: To prevent air being trapped in the top of the heat exchanger it is recommended to flush the heat exchanger with the 12mm tubing (B) – see Fig 5/A. – connected to the flow pipe within the combustion chamber after completion of the above steps.
  • Page 38 5 Commissioning and Testing 5.2 Venting the Boiler Fig 5/B Open valves (A) and (B) and vent at mains pressure, until the sound of escaping air cannot be heard. Close valves (A) and (B), and open the primary isolation flow valve.

  • Page 39: Venting The Heating System

    5 Commissioning and Testing 5.3 Venting the Heating System Close the gas shut off valve and start the control unit simultaneously to activate code 1 and use activate the venting program via coding address 2F:1(See fig 5/A). Under this coding the diverter valve is opened and closed for 20 minutes to assist venting and the display will show EL in Constant temperature mode.

  • Page 40: Filling The Siphon With Water

    5 Commissioning and Testing 5.4 Filling the Domestic Hot Water Circuit (Combi Boiler Only) Open the DHW inlet valve. Open all DHW taps in turn to vent any air from the DHW pipework. 5.5 Filling the Siphon with Water Fig 5/C a) Remove the retaining clip and siphon (A) b) Fill the siphon with water.
  • Page 41 5 Commissioning and Testing 5.6 Commissioning the Boiler Remove the pressure gauge. Tighten the inlet pressure test point screw. Restart the appliance and check for leakage of gas from the pressure test nipple. Fig 5/D: Gas Control Figure 5/E: Flue Gas Sampling Vitodens 200 is set up in the factory for natural gas and can be converted to LPG Propane using a conversion kit.

  • Page 42: Adjusting The Boiler Water Temperature

    5 Commissioning and Testing 5.7 Domestic Hot Water Flow Rate and Temperature (Combi Boiler Only) A flow regulator is fitted to ensure that no adjustment of maximum flow is necessary. The domestic hot water outlet temperature is regulated between the temperatures 32° and 57°C.This temperature can be changed on the controller by the following: Change the temperature of the DHW to the desired level by pressing the control button and the currently set value will be displayed.

  • Page 43: User's Instructions

    5 Commissioning and Testing 5.9 Final Checks Figure 5/F 5.10 User’s Instructions Upon completion of commissioning and testing, hand the appliance over to the User, with reference to the following. Give the Users instructions to the householder and emphasise their responsibilities under the current edition of the Gas Safety (Installation and Use) Regulations.

  • Page 44: Routine Servicing Instructions

    6 Routine Servicing To ensure continued efficient operation of the appliance, it is recommended that it is checked and serviced as necessary at regular intervals. The frequency of servicing will depend upon the particular installation conditions and usage but in general once a year should be adequate. It is the law that any service work must be carried out by a competent person such as a British Gas engineer or other CORGI registered personnel.

  • Page 45: Routine Servicing

    6 Routine Servicing 6.1 Routine Servicing Remove the outer casing as follows: Open the lower hinged controls cover. Remove the two screws securing the bottom of the upper decorative cabinet and remove this by pulling forward and place in a safe position. Disconnect the fixing clips at the side of the control pod and hinge the pod forwards.
  • Page 46 6 Routine Servicing 6.2 Ignition and Detection Electrodes Figure 6/B: Electrode Alignment 6.3 Burner Remove the electrodes (See Figure 6/B above & Figure 6/C below). Release the three Torx screws, and remove the thermal insulating ring (B). Release the four Torx screws, and remove the burner assembly with its gasket. Inspect the burner for blocked ports, cracks or slits.

  • Page 47: Combustion Chamber Cleaning

    6 Routine Servicing 6.4 Combustion Chamber Cleaning If required, clean combustion chamber (A) and heating surfaces within with a soft brush, or flush with water. Important. Scratches on parts which are in contact with flue gases can lead to corrosion. Only use plastic brushes rather than wire brushes.
  • Page 48 6 Routine Servicing 6.6 Checking the Condensate Drain and Cleaning the Siphon Check at the siphon, that the condensate can drain freely. Remove the retaining clip and the siphon. Clean the siphon. Fill the siphon with water, fit it to the boiler and secure with the retaining clip. 6.7 Domestic Hot Water Flow Limiter (Combi Boiler only) Shut of the cold water supply.

  • Page 49: Sealed Water System

    6 Routine Servicing 6.8 Re-commissioning Replace the sealed chamber front panel as reverse of removal. Switch on the electricity and gas supply and light the boiler. Check the operation of the appliance in both central heating and DHW modes. Check the combustion performance at maximum rate as in section 5.6. 6.9 Sealed Water System Check the operation of the pressure relief valve as described in section 5.1.

  • Page 50: Internal Wiring

    7 Internal Wiring Diagram KEY: Main PCB Boiler temperature sensor Step motor (Diverter valve)(Combi only) Ignition unit Air Pressure switch Flow switch (Combi only) DHW outlet sensor (Combi only) Comfort sensor (Combi only) Temperature limiter Fan motor Ionisation electrode Flue gas temperature sensor...

  • Page 51: Fault Finding

    8 Fault Finding It is the law that any service work must be carried out by a competent person such as a British gas engineer or other CORGI registered personnel 8.1 General Before looking for a fault condition, check that: The mains electrical supply is turned on.
  • Page 52 8 Fault Finding Diagnosis and correction. See the following table of error messages: Error System Cause of fault Action Message Behaviour Boiler cools down Boiler temperature sensor Check boiler temperature sensor shorted out Boiler cools down Boiler temperature sensor Check boiler temperature sensor open circuit Boiler cools down Flue gas temperature...

  • Page 53: Replacement Of Parts

    9 Replacement of Parts Before commencing any service operation, ISOLATE the mains supply and TURN OFF the gas supply at the appliance service cock. It is the law that any service work must be carried out by a registered person. 9.1 Heat Exchanger Close the isolation valves between the boiler and the central heating system.

  • Page 54: Fan Assembly

    9 Replacement of Parts 9.1 Heat Exchanger Remove the siphon connecting pipe from the bottom of the heat exchanger together with its bulkhead seal. Remove the retaining clips from the return connection of the heat exchanger and above the lower right hand bulkhead and remove the return pipe. Support the flue system above the flue connection collar.

  • Page 55: Ignition Electrodes

    9 Replacement of Parts 9.3 Burner Gain access by removing the burner assembly as described in section 9.1, steps (b) to (g). Remove the ignition and detection electrodes. Release the three Torx screws and remove the thermal insulating ring (B). Release the four Torx screws and remove the burner assembly (C) with its gasket.

  • Page 56: Gas Control

    9 Replacement of Parts 9.5 Detection Electrode Gain access by removing the burner assembly as described in section 9.1, steps (b) to (g). Remove the detection electrode by releasing the 5mm socket head screw and withdrawing the electrode. Fit a new electrode assembly using a new gasket and check all clearances. If the gaps are not as specified align the electrode.

  • Page 57: Air Pressure Switch

    9 Replacement of Parts 9.7 Air Pressure Switch Gain access to the relevant components by following steps (b) and (c) in section 9.1. Pull the electrical cable connector from the pressure switch (B). Disconnect the plastic sensing pipes from the pressure switch Release the two screws securing the pressure switch to the gas/air supply duct and remove the pressure switch.

  • Page 58: Limit Thermostat

    9 Replacement of Parts 9.9 P.C.B Release the seven plastic tabs securing the lid of the control pod and lift off the lid. Unplug all leads from the board to the boiler controls. Unplug all leads from the board to the boiler controls. Remove the two screws securing the plastic ventilated cover, unclip the four plastic securing clips and remove the cover/P.C.B assembly complete.
  • Page 59 9 Replacement of Parts 9.10 Limit Thermostat Gain access by following step 9.1(b). Locate the limit thermostats (Figure 9/A). Disconnect the electrical connections to the faulty thermostat. Unscrew the two screws securing the faulty thermostat to the flow pipe and remove the thermostat.
  • Page 60 9 Replacement of Parts 9.11 DHW Thermistor (A) (Combi only) Gain access by following step 9.1(b). Isolate the DHW circuit closing the DHW inlet valve. Drain the DHW circuit by opening any DHW tap below the level of the boiler. The DHW thermistor is situated over the domestic hot water outlet above the piping frame.

  • Page 61: Ch Thermistor

    9 Replacement of Parts 9.13 CH Thermistor Gain access by following step 9.1(b). Remove the sealed chamber front panel by removing the two socket head fixing screws at the bottom and hinge upwards unhooking from the top fixing lugs. Place the cover in a safe position. Isolate the central heating circuit by closing the flow and return valves.

  • Page 62: Flue Gas Temperature Sensor

    9 Replacement of Parts 9.14 Flue Gas Temperature Sensor Pull the leads from the flue gas temperature sensor. Pull the sensor together with its mounting bush from its aperture in the boiler flue. Replace as reverse of removal and reconnect leads. Check for correct functioning 9.15 Diverter Valve Mechanism (Combi Only) Gain access by following step 9.1(b).
  • Page 63 9 Replacement of Parts 9.16 DHW Heat Exchanger (Combi Only) Close the isolation valves between the boiler and the central heating system. Attach a suitable hose to the drain point on the lower right hand side of the boiler and drain the boiler. Gain access by following step 9.1(b).
  • Page 64 9 Replacement of Parts Figure 9/B: DHW Heat Exchanger 9.17 DHW Flow Regulator (to replace or clean) Gain access by following step 9.1(b). Remove the plate heat exchanger as in 9.16 above. Refer to section 6.7. Uncouple the pipe couplings immediately below the flow switch body and above the DHW inlet isolation valve.

  • Page 65: Dhw Flow Switch Sensor

    9 Replacement of Parts 9.17 DHW Flow Regulator (to replace or clean) Connect the filling loop, open the CH flow and return valves and re-pressurise the system to design pressure using the filling loop valves and venting as necessary. Open the DHW inlet valve. Check all connections for soundness, and then disconnect the filling loop.

  • Page 66: Pressure Relief Valve

    9 Replacement of Parts 9.19 Pump Head Unscrew the four recessed hexagon screws and withdraw the pump head. Remove the single screw securing the electrical connection cover. Remove and transfer electrical connections to the new pump and reassemble in reverse order ensuring that the pump is adjusted to maximum speed (II).

  • Page 67: Pressure Gauge

    9 Replacement of Parts 9.21 Pressure Gauge Gain access by following step 9.1(b). Isolate the central circuit by closing the flow and return valves. Drain the appliance using the drain point situated underneath the appliance at the bottom right hand side. Slide out the clip securing the pressure gauge connecter to the casing above the flow connection and pull out the connector.

  • Page 68: Auto Air Vent

    9 Replacement of Parts 9.22 Auto Air Vent Isolate the central circuit by closing the flow and return valves. Drain the appliance using the drain point situated underneath the appliance at the bottom right hand side. Unscrew the automatic air vent situated at the top of the boiler behind the flue connector.
  • Page 69 9 Replacement of Parts 9.23 Expansion Vessel NOTE: There may be a small discharge of water hence precautions should be taken. If a rear flue is fitted it is necessary to temporarily disconnect the flue system. Unscrew the automatic air vent situated at the top of the boiler behind the flue connector.

  • Page 70: Replacement Parts

    10 Replacement Parts Casing Seal Air Pressure Switch Front Cover Control Tubes Fixing Clip Mixture Damper Inner Front Cover Gas Supply pipe Venturi Top Burner Plate Gasket Gas Combination Valve Insulating Ring Burner Door Burner Gauze Assembly Ignition Unit Burner Gauze Assembly Gasket Conversion Kit Ignition Electrode with Gasket Conversion Kit...
  • Page 71 10 Replacement Parts Quick Acting Air Vent Valve Condensate Hose Connecting Pipe (with item 041) Flue Sampling Plugs (2 off) Thermostat Boiler Adaptor (with 019, 035 and 036) Temperature Sensor Pipe Retaining Clip Boiler Adaptor Grommets Hook–in Lock Securing Clip Return Pipe (with gasket 041) Flue Gas Temperature Sensor Combustion Air Gasket...
  • Page 72 10 Replacement Parts Pressure Gauge LON Communication module Vitodens Control Unit Connection adaptor Rear Cover Coding card Support Fuses (10 off) Door User interface (Constant temp operation) Pressure gauge Retainer User Interface (Compensated operation) Clip Locking clips (10 off) Hinge Outside Temperature Sensor Internal Extension Indicates Short Parts List Items...
  • Page 73 10 Replacement Parts Temperature Sensor Plate Heat Exchanger Comfort Sensor Flow Switch Thermal Insulation Water Flow Limiter Fixing Clip Linear Step Motor Pump Motor Expansion Vessel DHW Valve Connection Line Heat Exchanger Gasket Set Indicates Short Parts List items Indicates Combi boiler only...

  • Page 74: Index

    11 Index ............General Information .

  • Page 75: Benchmark Booklet

    11 Index 6 ..........Routine Servicing Instructions .
  • Page 80 Hortonwood 30 Telford Shropshire TF1 7YP United Kingdom Tel: +44 (0)1952 675060 Fax: +44 (0)1952 675040 www.viessmann.co.uk...

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