Viessmann Vitodens 222-F B2TH Installation And Service Instructions Manual
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Viessmann Vitodens 222-F B2TH Installation And Service Instructions Manual

Viessmann Vitodens 222-F B2TH Installation And Service Instructions Manual

1.9 to 32 kw gas condensing storage combi boiler with 7 inch colour touchscreen natural gas and lpg version
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VIESMANN
Installation and service instructions
for contractors
Vitodens 222-F
Type B2TH, 1.9 to 32 kW
Gas condensing storage combi boiler with 7 inch colour touchscreen
Natural gas and LPG version
VITODENS 222-F
Please keep safe.
6219766 GB
2/2025

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Summary of Contents for Viessmann Vitodens 222-F B2TH

  • Page 1 VIESMANN Installation and service instructions for contractors Vitodens 222-F Type B2TH, 1.9 to 32 kW Gas condensing storage combi boiler with 7 inch colour touchscreen Natural gas and LPG version VITODENS 222-F Please keep safe. 6219766 GB 2/2025...

  • Page 2: Target Group

    Safety instructions Safety instructions Please follow these safety instruc- tions closely to prevent accidents and material losses. Safety instructions explained Danger Note This symbol warns against the risk Details identified by the word "Note" of injury. contain additional information. Please note This symbol warns against the risk of material losses and environmen- tal pollution.

  • Page 3: Safety Instructions

    Safety instructions Safety instructions (cont.) Danger Auxiliary components, spare and Hot surfaces and fluids can lead to wearing parts burns or scalding. Please note Before maintenance and service ■ Auxiliary components, spare parts work, switch OFF the appliance and wearing parts that have not and let it cool down.

  • Page 4: If You Smell Flue Gas

    Safety instructions Safety instructions (cont.) Safety instructions for operating the system If you smell gas Condensate Danger Danger Escaping gas can lead to explo- Contact with condensate can be sions which may result in serious harmful to health. injury. Never let condensate touch your Do not smoke.
  • Page 5 Safety instructions Safety instructions (cont.) Danger The simultaneous operation of the boiler and appliances that exhausts air to the outside can result in life threatening poisoning due to a reverse flow of flue gas. Fit an interlock circuit or take suita- ble steps to ensure an adequate supply of combustion air.

  • Page 6: Table Of Contents

    ■ System examples .................. 14 Maintenance parts and spare parts ............14 Viessmann Partnershop ..............14 ■ Viessmann spare part app ..............15 ■ 2. Preparing for installation Manoeuvring ..................16 Siting in recesses ................... 16 Moving the ON/OFF switch (if necessary) ..........16 Preparing for boiler installation ..............
  • Page 7 Index Index 1139.0 Outside temperature limit for cancelling reduced set room tem- perature ....................74 1139.1 Outside temperature limit for raising the reduced set room tem- perature to the standard set room temperature ........74 1504.0 Source for date and time ............74 7.
  • Page 8 Index Index 1195.1 Maximum flow temperature limit, heating circuit 4 ..... 85 1395.1 Heating limit: Economy function, outside temperature, heating circuit 1 ....................85 1396.1 Heating limit: Economy function, outside temperature, heating circuit 2 ....................85 1397.1 Heating limit: Economy function, outside temperature, heating circuit 3 ....................
  • Page 9 Index Index 13. Diagnostics and service Service menu ..................93 checks Service menu ..................93 ■ Changing the service password ............. 93 Resetting all passwords to delivered condition ........94 Diagnosis ....................94 Checking operating data ..............94 ■ Calling up messages (message history) ..........94 Checking outputs (actuator test) ............
  • Page 10 Index Index F.183 ....................110 ■ F.184 ....................110 ■ F.185 ....................111 ■ F.299 ....................111 ■ F.342 ....................111 ■ F.345 ....................112 ■ F.346 ....................112 ■ F.348 ....................112 ■ F.349 ....................113 ■ F.350 ....................113 ■...
  • Page 11 Index Index F.447 ....................124 ■ F.448 ....................124 ■ F.449 ....................124 ■ F.450 ....................125 ■ F.451 ....................125 ■ F.452 ....................125 ■ F.453 ....................125 ■ F.454 ....................125 ■ F.455 ....................126 ■ F.456 ....................126 ■...
  • Page 12 Index Index (cont.) F.765 ....................137 ■ F.797 ....................137 ■ F.799 ....................137 ■ F.875 ....................138 ■ F.980 ....................138 ■ F.981 ....................138 ■ F.982 ....................139 ■ F.1312 ....................139 ■ Further fault without F.xxx; no communication with TCU....139 ■...

  • Page 13: Information Disposal Of Packaging

    Information Disposal of packaging Please dispose of packaging waste in line with statu- tory regulations. Symbols The steps in connection with commissioning, inspec- Symbol Meaning tion and maintenance are found in the "Commission- Reference to other document containing ing, inspection and maintenance" section and identified further information as follows: Step in a diagram:...

  • Page 14: Product Information

    Detailed information regarding system examples: tion diagrams and function descriptions are available www.viessmann-schemes.com to help setting up the heating system. Maintenance parts and spare parts You can identify and order maintenance parts and spare parts directly online. Viessmann Partnershop Login: shop.viessmann-climatesolutions.com...

  • Page 15: Viessmann Spare Part App

    Information Maintenance parts and spare parts (cont.) Viessmann spare part app Web application www.viessmann.com/etapp ViParts app...

  • Page 16: Preparing For Installation Manoeuvring

    Preparing for installation Manoeuvring Please note Prevent damage to the appliance during han- dling. Never set the appliance down on its front or sides, or apply any load to these surfaces. If possible, leave the boiler on the pallet while manoeuvring it.

  • Page 17: Preparing For Boiler Installation

    Preparing for installation Moving the ON/OFF switch (if necessary) (cont.) Open the electrical wiring chamber of the HMU. Dis- 3. Clip the ON/OFF switch into the corresponding connect the cable of the ON/OFF switch and remove. opening at the top or on the right-hand side. See electrical connections.
  • Page 18 Preparing for installation Preparing for boiler installation (cont.) Ø 100 Ø 60 Fig. 2 Heating flow R Condensate drain to the side ¾ DHW R Area for electrical cables (on-site junction box) ½ Gas connection R ½ Cold water R Note ½...
  • Page 19 Preparing for installation Preparing for boiler installation (cont.) 1. Prepare the connections on the heating water side. Thoroughly flush the heating system. Note Should an additional expansion vessel be required on site, connect this vessel in the heating return. 2. Prepare the connections on the DHW side. Install the safety assembly (accessories or on-site provi- sion) in accordance with EN 806 [or local regula- tions] in the cold water supply.

  • Page 20: Safety Assembly To Din 1988 And En 806

    Preparing for installation Preparing for boiler installation (cont.) 4. Prepare gas connection to TRGI [or local regula- tions]. 5. Prepare the electrical connections. ■ The appliance is delivered fitted with a power cable (approx. 1.5 m long). Power supply: 230 V, 50 Hz, fuse rating ■...

  • Page 21: Installation Sequence Siting The Boiler

    Installation sequence Siting the boiler Fig. 5 Type plate Note Attaching the additional type plate The type plate is attached to cover panel in the appliance. See page 48. 1. Take the additional type plate from the documenta- Additional type plate with access code (QR code) tion supplied with the boiler.

  • Page 22: Removing The Front Panel

    Installation sequence Siting the boiler (cont.) 2. In consultation with the system user, affix the addi- tional type plate to the outside of the appliance. The additional type plate must be visible to the flue gas inspector. Affix another QR code to the installation and serv- ice instructions.

  • Page 23: Connections On The Heating Water And Dhw Sides

    Installation sequence Connections on the heating water and DHW sides Fig. 7 Shown with connection sets for surface mounting (accessories) Heating flow R Cold water R ¾ ½ DHW R Heating return R ½ ¾ DHW circulation R (separate accessory) ½...

  • Page 24: Flue Gas Connection

    Installation sequence Flue gas connection Connect the balanced flue pipe. Note The "System certification" and "Skoberne GmbH flue Installation instructions for the flue system system" labels enclosed with the technical documenta- tion may only be used in conjunction with the Viess- mann flue system made by Skoberne.

  • Page 25: Gas Connection

    Installation sequence Gas connection Fig. 9 1. If the gas connection has not been fitted previ- 3. Purge the gas line. ously, seal gas shut-off valve to the gas con- nection. When carrying out any work on gas connection fit- tings, counterhold with a suitable tool.

  • Page 26: Electrical Connections

    Installation sequence Electrical connections Opening the HMU wiring chamber Please note Electronic assemblies can be damaged by elec- trostatic discharge. Prior to commencing any work, touch earthed objects, such as heating or water pipes to dis- charge static loads. Fig. 10 Note For further information on the connections, see the fol- lowing chapters.

  • Page 27: On-Site Connections On The Heat Management Unit

    Installation sequence Electrical connections (cont.) P2 230 V parametrisable output: Connections to extra low voltage (ELV) plugs DHW circulation pump or heating circuit pump for Outside temperature sensor heating circuit without mixer (for a system with Terminals 1 and 2 on plug low loss header) or heating circuit pump for heat- Cylinder temperature sensor (connected in the ing circuit without mixer A1, without low loss...

  • Page 28: Outside Temperature Sensor

    Installation sequence Electrical connections (cont.) Plugs for the electrical connections in the appli- ance 6 5 4 3 2 1 6 5 4 3 2 1 Fig. 13 Route the plug with power cable (required plugs are supplied in separate packaging) through the cable guide on the back of the appliance.

  • Page 29: Connecting The Circulation Pump To P2

    Installation sequence Electrical connections (cont.) Connecting the circulation pump to P2 Information on priority of connection options: If heating circuit pump for heating circuit without ■ mixer A1 is installed: Then connect DHW circulation pump to an EM-P1 extension (accessories). ■...

  • Page 30: Terminator For External Can Bus System

    Installation sequence Electrical connections (cont.) The max. total length of the PlusBus lead is 50 m. With an unscreened lead, 2-core, 0.34 mm Terminator for external CAN bus system When integrating into an external CAN bus system, a Other CAN bus subscribers distinction is made as to whether a CAN bus sub- Connection of external CAN bus without terminator scriber is the first, last or central subscriber.
  • Page 31 Installation sequence Electrical connections (cont.) Power supply and PlusBus connection of accessories Power supply of all accessories at the HMU heat management unit Fig. 19 Some accessories with direct power supply Fig. 20 HMU heat management unit, heat generator ON/OFF switch Mixer extension kit (ADIO electronics module) Mains input fÖ...

  • Page 32: Power Supply Fö

    Installation sequence Electrical connections (cont.) Power supply fÖ Danger If the power supply to the appliance is connected ■ Incorrectly executed electrical installations can with a flexible power cable, ensure that the live con- result in injuries from electrical current and dam- ductors are pulled taut before the earth conductor in age to the appliance.

  • Page 33: Routing Connecting Cables

    Installation sequence Electrical connections (cont.) Wireless signals are isolated by service ducts and Ideal angle of penetration ■ lift shafts. ■ Wireless signals are disrupted by devices that also operate with high frequency signals. Distance to such appliances: Min. 2 m. Examples of devices with high frequency signals: Computers –...

  • Page 34: Closing The Wiring Chamber

    Installation sequence Closing the wiring chamber Fig. 23 Fitting the front panel and programming unit Fig. 24 Lightguide at the bottom...

  • Page 35: Commissioning, Inspec-Steps - Commissioning, Inspection And Maintenance

    Commissioning, inspection, maintenance Steps - commissioning, inspection and maintenance Commissioning steps Inspection steps Maintenance steps Page • • • 1. Filling the trap with water....................37 • • 2. Removing the front panels....................37 • 3. Moving the programming unit to the maintenance position.......... 37 •...
  • Page 36 Commissioning, inspection, maintenance Steps - commissioning, inspection and… (cont.) Commissioning steps Inspection steps Maintenance steps Page • • • 40. Checking the external LPG safety valve (if installed) • 41. Matching the control unit to the heating system............69 • 42.

  • Page 37: Filling The Trap With Water

    Commissioning, inspection, maintenance Filling the trap with water Please note Only commission the appliance with a fully filled trap. Check that the trap has been filled with water. Pour at least 0.3 l of water into the flue gas connection. Please note During commissioning, flue gas may escape from the condensate drain.

  • Page 38: Commissioning The System With The Commissioning Assistant

    Commissioning, inspection, maintenance Moving the programming unit to the maintenance… (cont.) Fig. 26 Commissioning the system with the commissioning assistant Commissioning assistant 1. Open the gas shut-off valve. Commissioning via software tool 2. If the appliance has not been switched on yet: Turn Note on the ON/OFF switch.
  • Page 39 Commissioning, inspection, maintenance Commissioning the system with the commissioning… (cont.) 8. Follow the instructions in the app. Commissioning assistant Explanations and references sequence Commissioning Language With programming unit If commissioning is to be carried out at the programming unit of the heat generator.
  • Page 40 Commissioning, inspection, maintenance Commissioning the system with the commissioning… (cont.) Commissioning assistant Explanations and references sequence Settings for DHW heating according to the system components Not available System without DHW heating ■ Cylinder with one sensor System with DHW cylinder with 1 cylinder temperature sensor ■...
  • Page 41 Commissioning, inspection, maintenance Commissioning the system with the commissioning… (cont.) Commissioning assistant Explanations and references sequence Floating contact: Function If a contact has been connected to plug 96 of the HMU heat management selection plug 96 unit. No function ■ External demand, DHW Pushbutton function, DHW circulation pump runs for 5 min.

  • Page 42: Commissioning The System In A System Network

    Commissioning the system in a system network Commissioning Vitodens and the heat pump with Viessmann One Base All Viessmann appliances with One Base in a system Commissioning the heat pump in a system net- network (gas condensing system boiler + OneBase...
  • Page 43 Heat pump installation and service instruc- tions. Note 1. Where one or more of the other Viessmann appli- During commissioning of the main appliance (heat ances have already been operational as a stand- pump), a lock screen appears on the programming...

  • Page 44: Filling The Heating System

    Commissioning, inspection, maintenance Commissioning the system in a system network (cont.) 5. Further settings via the ViCare app: The heat pump must be connected to the Viess- mann server via the internet in order to perform settings via the ViCare app. This internet connec- tion is established via the home WiFi.

  • Page 45: Venting The Boiler

    Commissioning, inspection, maintenance Filling the heating system (cont.) Activating the filling function Tap the following buttons: 5. "Service functions" 6. "Filling" 2. "Service" 7. Activate the filling function with The display shows the system pressure. 3. Enter password "viservice". The filling function ends automatically after 20 min or when you tap 4.

  • Page 46: Venting The Heating System

    Commissioning, inspection, maintenance Venting the boiler (cont.) 5. Remove drain hose from air vent valve keep safe. Venting the heating system Fig. 29 1. Check whether the air vent screw in quick-action 3. Activate venting function (see following steps). air vent valve of the heating circuit pump is open.

  • Page 47: Filling The Dhw Cylinder On The Dhw Side

    Commissioning, inspection, maintenance Filling the DHW cylinder on the DHW side 1. The lever on the valve must be in position 2. Open the on-site DHW supply and a DHW draw-off point. 3. Once air stops coming out of the DHW draw-off point, the DHW cylinder is completely filled.

  • Page 48: Converting The Gas Type (Only For Operation With Lpg)

    Commissioning, inspection, maintenance Checking the gas type (cont.) 1. Determine the gas type and Wobbe index by ask- 2. Record the gas type in the service report. ing your local gas supply utility or LPG supplier. Converting the gas type (only for operation with LPG) 1.

  • Page 49: Function Sequence And Possible Faults

    Commissioning, inspection, maintenance Checking the static pressure and supply pressure (cont.) 06. Start the boiler. 09. Shut down the boiler. Close the gas shut-off valve. Note 10. Remove the pressure gauge. Tighten the screw in During commissioning, the appliance can enter a test connector fault state if there are airlocks in the gas line.

  • Page 50: Setting The Max. Heating Output

    Commissioning, inspection, maintenance Function sequence and possible faults (cont.) Gas train opens Fault F.357 Check the gas supply pres- sure. Ionisation current builds Fault F.369, F.380 Check distance of ionisation electrode on burner gauze assembly. Purge the gas line. Burner in operation Shuts down below the set Check the flue system for boiler water temperature and...

  • Page 51: Activating Screed Drying

    Commissioning, inspection, maintenance Setting the max. heating output (cont.) 10. Set required value as a % of the rated heating out- 11. End service functions. put and confirm with . Factory setting 100 %. Activating screed drying Screed drying 6 different temperature profiles can be set for screed Note drying: Screed drying applies to all connected heating circuits...
  • Page 52 Commissioning, inspection, maintenance Adjusting pump rate of integral circulation pump (cont.) Residual head of integral circulation pump 650 65 550 55 500 50 450 45 350 35 250 25 150 15 1000 1100 1200 1300 1400 Flow rate in l/h Fig.

  • Page 53: Checking The Balanced Flue System For Leaks (Annular Gap Check)

    Commissioning, inspection, maintenance Checking the balanced flue system for leaks (annular gap check) Fig. 35 Combustion air aperture (ventilation air) For balanced flue systems tested together with the If actual CO values are greater or O values are lower, heat generator, there is no requirement for a tightness then pressure test the flue pipe with a static pressure test (overpressure test) during commissioning by the of 200 Pa.

  • Page 54: Removing The Burner

    Commissioning, inspection, maintenance Removing the burner Fig. 36 1. Turn off the ON/OFF switch. 5. Undo gas supply pipe fitting 2. Close the gas shut-off valve and safeguard against 6. Detach Venturi extension from fan unit. reopening. 7. Undo 4 screws and remove the burner.

  • Page 55: Checking The Burner Gasket And Burner Gauze Assembly

    Commissioning, inspection, maintenance Checking the burner gasket and burner gauze assembly Fig. 37 Check burner gauze assembly , electrodes , ther- 05. Install new burner gasket . Observe correct installation position. Align the tab as per the dia- mal insulation ring and gasket for damage.
  • Page 56 Commissioning, inspection, maintenance Checking the burner gasket and burner gauze… (cont.) 07. Align the hole in burner gauze assembly 08. Check thermal insulation ring with for firm seating. burner door pin 09. Fit electrodes . Check clearances, see following Please note chapter.
  • Page 57 Commissioning, inspection, maintenance Checking the burner gasket and burner gauze… (cont.) Fig. 39...

  • Page 58: Checking And Adjusting The Ignition And Ionisation Electrodes

    Commissioning, inspection, maintenance Checking and adjusting the ignition and ionisation electrodes 6.5 +1/-0.5 ±0.5 Fig. 40 Ignition electrodes Ionisation electrode 1. Check the electrodes for wear and contamination. 3. Check the electrode gaps. If the gaps are outside the tolerance range or the electrodes are dam- 2.

  • Page 59: Cleaning The Heating Surfaces

    Commissioning, inspection, maintenance Checking the back draught safety devices (cont.) Back draught safety device in the flue gas connec- 1. Remove the balanced flue system. tion Note If the balanced flue system cannot be removed, clean and check the back draught safety device via the inspection cover.
  • Page 60 Commissioning, inspection, maintenance Checking the condensate drain and cleaning the… (cont.) Fig. 44 1. Pivot the HMU heat management unit forwards. 8. Check that connections on the trap and the heat exchanger are seated correctly. 2. Undo the hose retainer. Remove the supply hose. Note Please note Route the drain hose without any bends and with a...

  • Page 61: Installing The Burner

    Commissioning, inspection, maintenance Installing the burner Fig. 45 1. If necessary, move the programming unit. 5. Check the gas connections for leaks. 2. Insert the burner and tighten screws diagonally. Danger Escaping gas leads to a risk of explosion. Tighten the screws as much as necessary to ensure that the components are not damaged and Check the fitting for gas tightness.

  • Page 62: Checking Anode Connection And Anode Earth Current With Anode Tester

    Commissioning, inspection, maintenance Checking anode connection and anode earth current with anode tester Check that the earth cable is connected to the protec- tive magnesium anode. Note We recommend checking the function of the protective magnesium anode annually. This function test can be carried out without interrupting operation, by measur- ing the earth current with an anode tester.

  • Page 63: Cleaning The Loading Cylinder

    Commissioning, inspection, maintenance Draining the boiler on the DHW side (cont.) 2. Connect the hose to the drain valve and route it into a suitable container or drain outlet. Note Ensure adequate ventilation in the DHW pipework. 3. Turn the drain valve from lever position (opera- tional) to lever position as required.

  • Page 64: Checking And Replacing The Protective Magnesium Anode (If Necessary)

    Commissioning, inspection, maintenance Cleaning the loading cylinder (cont.) Fig. 48 1. Drain the loading cylinder. 5. Thoroughly flush the loading cylinder after clean- ing. 2. Remove flange cover 3. Disconnect the loading cylinder from the pipework to prevent contamination from entering the pipe- work.

  • Page 65: Re-Assembling And Filling The Loading Cylinder

    Commissioning, inspection, maintenance Re-assembling and filling the loading cylinder Fig. 49 1. Reconnect the loading cylinder to the pipework. 4. Push earth cable onto the tab. 2. Insert a new gasket underneath the flange 5. Fit the cover (two-part design up to 26 kW). cover 6.

  • Page 66: Checking The Diaphragm Expansion Vessel And System Pressure

    Commissioning, inspection, maintenance Checking the diaphragm expansion vessel and system pressure Fig. 50 Diaphragm expansion vessel valve Note 3. Top up with water until the charge pressure of the The expansion vessel can lose some of its charge cooled system is at least 1.0 bar (0.1 MPa), and is pressure over time.

  • Page 67: Checking Pre-Charge Pressure And Dhw Expansion Vessel (If Installed)

    Commissioning, inspection, maintenance Checking pre-charge pressure and DHW expansion vessel (if installed) 1. Check the static pressure of the DHW line down- stream of the pressure reducer and adjust if required. Set value: Max. 3.0 bar (0.3 MPa) 2. Close the on-site shut-off valve in the cold water line.
  • Page 68 Commissioning, inspection, maintenance Checking the combustion quality (cont.) Permissible CO or O content Operation with natural gas Rated heating out- content (%) content (%) put (kW) Upper heating out- Lower heating out- Upper heating out- Lower heating out- 7.3 to 10.5 7.5 to 10.5 2.1 to 7.9 2.1 to 7.6...

  • Page 69: Checking The Flue System For Unrestricted Flow And Leaks

    Commissioning, inspection, maintenance Checking the combustion quality (cont.) 07. Select "Burner modulation, set value". 09. Set the upper heating output: The boiler circuit pump operates automatically at Select "Maximum heating output". 100 %. The burner now operates at the upper heating out- put.

  • Page 70: Fitting The Front Panel

    Commissioning, inspection, maintenance Calling up and resetting the maintenance display (cont.) 7. Select parameter 1411.0 "Clear maintenance messages" and "ON". Note The selected service parameters for hours run and time intervals restart at 0. Fitting the front panel Fig. 53 Instructing the system user The system installer should hand the operating instruc- tions to the system user and explain to the user how to...

  • Page 71: System Configuration Calling Up Parameters

    System configuration (parameters) Calling up parameters Parameters are split into the following groups: Tap the following buttons: ■ – "General" – "Boiler" 01. " " – "DHW" – "Heating circuit ..." 02. "Service" "Solar" – Heating systems with one heating circuit without 03.

  • Page 72: Parameter Group - General Parameter Value

    Parameter group – general Parameter value Note Parameter values in bold are factory settings. 508.0 UTC time zone Setting of the UTC time zone in which the appliance is Value Meaning located. The factory setting is UTC +1 h 24 to Time difference adjustable from 12 h to –...

  • Page 73: 912.0 Automatic Summer/Wintertime Changeover

    Parameter group – general 912.0 Automatic summer/wintertime changeover Value Meaning No automatic summer/wintertime changeover Automatic summer/wintertime changeover ac- tive 912.1 Earliest day of changeover from winter to summertime Value Meaning Changeover from 02:00 to 03:00 occurs on the Sunday after or on this set date. 1 to 31 Day of changeover adjustable from 1st to 31st of the month 912.2 Month of changeover from winter to summertime...

  • Page 74: 1098.5 Condensing

    Parameter group – general 1098.5 Condensing Value is provided on the gas supplier's bill. Value Meaning Used for energy consumption data. Standard for natural gas. Data in kWh/m If gas type is switched to LPG, the standard value switches to 10.45 5 to 40 Calorific value adjustable from 5 to 40 kWh/m in increments of 0.0001...

  • Page 75: Parameter Value

    Parameter group for boiler Parameter value Note Parameter values in bold are factory settings. 521.0 Interval in burner hours run until next maintenance Number of burner hours to run until next service Value Meaning Delivered condition 0 to Burner hours until next service adjustable 25500 from 0 to 25500 522.3 Interval until next maintenance...

  • Page 76: 1240.0 Operating Mode Of The Primary Circuit Pump

    Parameter group for boiler 1240.0 Operating mode of the primary circuit pump Value Meaning "Automatic system" Switched on regardless of current tempera- ture level Shutdown in reduced mode (in conjunction with continuous operation or when no de- mand via room thermostat) 1411.0 Clear maintenance messages Clear maintenance messages if maintenance has Value...

  • Page 77: 1606.4 Burner Integral Threshold

    Parameter group for boiler 1606.0 Minimum burner pause time (cont.) Value Meaning Fixed setting for minimum burner pause time Delivered condition, integral method (see pa- rameter 1606.4) 1606.4 Burner integral threshold Only effective if parameter 1606.0 is set to 1. Value Meaning Factory setting 50 K x min...

  • Page 78: Parameter Value

    Parameter group for DHW Parameter value Note Parameter values in bold are factory settings. 497.0 Operating mode of DHW circulation pump DHW circulation pump Value Meaning The DHW circulation pump runs continuously within the time program during the set time phases.

  • Page 79: 503.0 Scald Protection

    Parameter group for DHW 497.3 Number of cycles DHW circulation pump (cont.) Value Meaning 1 cycle per h 2 cycles per h 3 cycles per h 4 cycles per h 5 cycles per h 6 cycles per h 503.0 Scald protection Scald protection limits the cylinder temperature to max.

  • Page 80: Parameter Value

    Parameter group for heating circuit 1, heating circuit 2, heating circuit 3, heating circuit 4 Parameter value Note Parameter values in bold are factory settings. 424.3 Set flow temperature increase, heating circuit 1 Set flow temperature increased when changing from Value Meaning operation at reduced room temperature to operation at...

  • Page 81: Set Flow Temperature Increase, Heating Circuit 4

    Parameter group for heating circuit 1, heating circuit 2, heating circuit 3, heating circuit 4 430.3 Set flow temperature increase, heating circuit 4 Set flow temperature increased when changing from Value Meaning operation at reduced room temperature to operation at Delivered condition increase 0 K standard room temperature or comfort room tempera- 0 to 20 Temperature increase adjustable from 0 to...

  • Page 82: Room Influence Factor, Heating Circuit 2

    Parameter group for heating circuit 1, heating circuit 2, heating circuit 3, heating circuit 4 934.6 Operating mode, heating circuit 2 (cont.) Value Meaning Weather-compensated without room temper- ature influence Weather-compensated with room tempera- ture influence (see also parameter 934.7). Note Parameter 2427.2 is switched on automatical- 934.7 Room influence factor, heating circuit 2...

  • Page 83: Differential Temperature, Heating Circuit 4

    Parameter group for heating circuit 1, heating circuit 2, heating circuit 3, heating circuit 4 935.7 Room influence factor, heating circuit 3 (cont.) For a sample calculation, see chapter "Heating curve" Value Meaning in the "Function description" Room influence factor 0 to 64 Room influence adjustable from 0 to 64 Necessary conditions for room temperature influence: ■...

  • Page 84: 1102.1 Max. Speed Of The Variable Speed Primary Circuit/Heating Circuit Pump In Standard Mode, Heating Circuit 1

    Parameter group for heating circuit 1, heating circuit 2, heating circuit 3, heating circuit 4 1102.1 Max. speed of the variable speed primary circuit/heating circuit pump in standard mode, heating circuit 1 Maximum speed of the internal circulation pump in Value Meaning heating mode with standard room temperature...

  • Page 85: 1195.0 Minimum Flow Temperature Limit, Heating Circuit 4

    Parameter group for heating circuit 1, heating circuit 2, heating circuit 3, heating circuit 4 1194.1 Maximum flow temperature limit, heating… (cont.) Value Meaning Max. flow temperature 82 °C 20 to Setting range limited by parameters, depend- ing on appliance version 1195.0 Minimum flow temperature limit, heating circuit 4 Limiting of set flow temperature for heating operation Value...

  • Page 86: 1398.1 Heating Limit: Economy Function, Outside Temperature, Heating Circuit 4

    Parameter group for heating circuit 1, heating circuit 2, heating circuit 3, heating circuit 4 1398.1 Heating limit: Economy function, outside temperature, heating circuit 4 The heating limit influences the start and stop behav- Value Meaning iour of the heating circuit pump (economy control) Heating limit at outside temperature 25 °C ■...

  • Page 87: 1791.0 3-Way Valve Target Position

    Energy saving functions (setting only via software tool) 1791.0 3-way valve target position The 3-way valve assumes the set position when there Value Meaning is no demand for heating operation or DHW heating. Heating Central position 2426.0 Enable economy function, outside temperature, heating circuit 1 Energy saving function for the heating circuit pump of Value Meaning...

  • Page 88: 2427.0 Enable Economy Function, Outside Temperature, Heating Cir- Cuit 2

    Energy saving functions (setting only via software tool) 2427.0 Enable economy function, outside temperature, heating circuit 2 Energy saving function for the heating circuit pump of Value Meaning heating circuit 2 for weather-compensated room heat- Energy saving function off ing. Energy saving function on Energy saving function on: If the outside temperature exceeds the set room tem-...

  • Page 89: Cuit 3

    Energy saving functions (setting only via software tool) 2428.0 Enable economy function, outside temperature, heating circuit 3 Energy saving function on: Value Meaning ■ If the outside temperature exceeds the set room Energy saving function off temperature plus the value in parameter 2428.1, the Energy saving function on circulation pump switches off.

  • Page 90: 2429.1 Weather-Compensated Heating Circuit Pump Logic For Heating Circuit 4

    Energy saving functions (setting only via software tool) 2429.1 Weather-compensated heating circuit pump logic for heating circuit 4 Value Meaning Setting If the adjusted outside temperature ex- ■ range -9 ceeds the set room temperature plus the to +5 K value in parameter 2429.1, the circula- tion pump switches off.

  • Page 91: 2855.1 Additional (Passive) Frost Protection Configuration, Heating Cir- Cuit 1

    Frost protection configuration (setting only via software tool) 2855.1 Additional (passive) frost protection configuration, heating circuit 1 If the outside temperature falls below the set outside Setting Meaning temperature limit, the corresponding heating circuit = 1 °C pump switches on (applies only to weather-compensa- Setting range: -9 °C to +3 °C ted operation).

  • Page 92: Subscriber Numbers Of Connected Extensions

    Setting the subscriber numbers Subscriber numbers of connected extensions All extensions connected to the heat generator (except Rotary switch S1 settings: the SDIO/SM1A electronics module) must have a sub- ■ EM-S1 extension (system with solar collectors): 0 scriber number. The subscriber number is set on rotary ■...

  • Page 93: Diagnostics And Service Service Menu

    Diagnostics and service checks Service menu Service menu Calling up the service menu Service menu overview Tap the following buttons: Service Diagnosis 1. " " General 2. "Service" Burner Heating circuit 1 3. Enter password "viservice". Heating circuit 2 4. Confirm with Heating circuit 3 Heating circuit 4 5.

  • Page 94: Resetting All Passwords To Delivered Condition

    10. Confirm twice with 09. Enter new password. Resetting all passwords to delivered condition Tap the following buttons: 5. Confirm with 1. Request the master password from Viessmann 6. "Change passwords" Technical Service. 7. "Reset all passwords" 2. " "...

  • Page 95: Checking Outputs (Actuator Test)

    Diagnostics and service checks Calling up messages (message history) (cont.) 5. "Message history" "Faults" to call up saved fault messages. For ■ further details, see the following chapter "Fault The following is displayed in the message lists: messages". ■ Date and time of the occurrence of the notifica- ■...
  • Page 96 Diagnostics and service checks Checking outputs (actuator test) (cont.) The following actuator functions can be controlled subject to the system equipment level: Display Explanation Gas condensing boiler group Fan speed Set value Burner fan speed in rpm (rotations/minute) Burner modulation, set Modulation level (in accordance with specific heat generator settings) ■...
  • Page 97 Diagnostics and service checks Checking outputs (actuator test) (cont.) Display Explanation Solar circuit pump, set Set value Speed, solar circuit pump in % speed Circulation pump hy- giene function Circulation pump, solar 3-way valve, solar Open Target position Close Stop...

  • Page 98: Troubleshooting Fault Display On The Programming Unit

    Troubleshooting Fault display on the programming unit If there is a fault, the display shows the fault message The following is displayed: plus ■ Date and time of the occurrence of the fault ■ Fault code Note ■ Description of the fault If a central fault message facility is connected, this is ■...

  • Page 99: Overview Of Electronics Modules

    Troubleshooting Overview of electronics modules Fig. 55 HMI programming unit BCU burner control unit HMU heat management unit Fault messages Note Diagnostics and troubleshooting: See chapter "Repairs". Fault messages dependent on appliance equipment level System characteristics Measures Flow rate not being monitored. System continues oper- Check plug 33/X6 and cable between BCU burner con- ating in normal mode with replacement value.
  • Page 100 Troubleshooting Fault messages (cont.) System characteristics Measures No DHW heating. ■ Check DHW setting in the commissioning assistant and correct if necessary. Cause ■ Check cylinder temperature sensor (plug 5, wires 3 and 4). Lead break, cylinder temperature sensor. Measure voltage at sensor input on electronics mod- ■...
  • Page 101 Troubleshooting Fault messages (cont.) F.14 System characteristics Note Depending on appliance version, on floorstanding Regulates as if the outside temperature were 0 °C. compact appliances the plug is located inside the appliance. Cause Short circuit, outside temperature sensor. Measures Check outside temperature sensor and connection to sensor (external plug and contacts 1 and 2).
  • Page 102 Troubleshooting Fault messages (cont.) F.30 System characteristics Measures Regulates without flow temperature sensor for low loss Check flow temperature sensor, low loss header. header. Measure voltage at sensor input on electronics mod- ule. Set value: 3.3 V with sensor disconnected Cause Short circuit, low loss header sensor.
  • Page 103 Troubleshooting Fault messages (cont.) Measures Check the external room temperature sensor for ■ NTC 10 kΩ resistance at the disconnected terminal ■ Check on the Vitotrol whether a setting has been 13c / 9. Replace sensor if necessary. made for an external sensor. If necessary, carry out ■...
  • Page 104 Troubleshooting Fault messages (cont.) Reset the appliance. F.63 System characteristics ■ Check whether flow rate is sufficient (flow sensor and circulation pump). Burner in a fault state. ■ Check 3-way diverter valve function in actuator test. Vent the system. Cause Reset the appliance once the flue system has cooled down.
  • Page 105 Troubleshooting Fault messages (cont.) If specified measures do not help, replace fan unit. Reset the appliance. F.68 System characteristics Measures Burner in a fault state. Close the gas shut-off valve. Remove connecting cable of the ionisation electrode. Reset the appliance. Cause If the fault persists, replace the BCU burner control unit.
  • Page 106 Troubleshooting Fault messages (cont.) F.72 System characteristics Measures Burner in a fault state. Reset the appliance. If the fault recurs, replace the fan unit. Cause Fan idle state not reached. F.73 System characteristics Measures Burner in a fault state. Reset the appliance. If the fault recurs, replace the BCU burner control unit.
  • Page 107 Troubleshooting Fault messages (cont.) F.78 System characteristics Measures Normal operation Check cables and plug-in connections between heat management unit and programming unit. Check cables Cause for correct routing and positioning. Communication between heat management unit and programming unit faulty. F.80 System characteristics Measures Normal operation...
  • Page 108 Troubleshooting Fault messages (cont.) F.92 System characteristics Measures Function of the relevant electronics module in emer- ■ Check setting in the commissioning assistant and gency mode. correct if required. ■ Check connections and leads to the ADIO electron- Cause ics module. Check PlusBus voltage level (24 to 28 V).
  • Page 109 Troubleshooting Fault messages (cont.) Cause Measures External fault message input active. Check connected external appliance. F.142 System characteristics ■ If fault F.142 is still present, check the CAN bus cable (internal CAN bus) and plug-in connection Burner in a fault state. between HMU X4 and BCU X4 as well as BCU X1 (100A) and fan unit 100A for correct seating, contact Cause...
  • Page 110 Troubleshooting Fault messages (cont.) F.180 System characteristics Measures Burner in a fault state. Check gas pressure. Inform the gas supplier if neces- sary. Cause If the fault recurs: Replace the gas pressure switch. Replace the gas solenoid valve if necessary. Gas pressure too low.
  • Page 111 Troubleshooting Fault messages (cont.) F.185 System characteristics Replace the BCU electronics module. ■ Reset the appliance. ■ Burner in a fault state. Cause Lead break, flow temperature sensor/high limit safety cut-out. Measures ■ Check the connections and plug-in connection X1 (plugs 3 and 3A) on the BCU electronics module for correct seating, contact corrosion and mechanical damage.
  • Page 112 Troubleshooting Fault messages (cont.) F.345 System characteristics Check whether the primary pump is running. Discon- ■ nect the PWM plug from the pump. Pump is running Burner locked out, automatic enabling after appliance at full load (with Vitodens 3xx, the flow rate can be cooldown.
  • Page 113 Troubleshooting Fault messages (cont.) F.349 System characteristics Check whether the function of the heat exchanger is ■ restricted by increased soiling. If necessary, clean Burner in a fault state. the heat exchanger to remove any dirt. ■ Check whether the burner gauze assembly is restric- Cause ted by increased soiling.
  • Page 114 Troubleshooting Fault messages (cont.) Measures Replace gas fan unit. F.355 System characteristics Note Remove the fan unit before opening the burner. Pro- Burner in a fault state. tect the PCB from water damage. Cause Replace the BCU burner control unit. Check ignition transformer and ignition cable.
  • Page 115 Troubleshooting Fault messages (cont.) F.361 System characteristics Note Deposits on the electrodes indicate foreign bodies in Burner in a fault state. the combustion air. Check the installation room and flue system for causes of the deposits. For example, Cause laundry detergents, cleaning agents, toiletries, depos- its in the ventilation air supply (chimney).
  • Page 116 Troubleshooting Fault messages (cont.) F.368 System characteristics Measures Burner in a fault state. Check gas supply (gas pressure). Check gas pressure switch (if installed). If necessary, Cause disconnect the gas pressure switch connector and check whether the burner starts. Gas pressure switch fault. Forced ventilation time Reset the appliance.
  • Page 117 Troubleshooting Fault messages (cont.) Check system for condensate backup. Check the installation room and flue system for causes ■ ■ Visually check gas solenoid valve inlet and inlet of the deposits. For example, laundry detergents, strainer for contamination. cleaning agents, toiletries, deposits in the ventilation air supply (chimney).
  • Page 118 Troubleshooting Fault messages (cont.) Check the ionisation electrode and burner gauze Check balanced flue system for flue gas recircula- ■ ■ assembly for soiling. tion. ■ Check that the ignition electrode is correctly installed ■ Check the condensate drain and trap for damage, and whether the gasket is damaged.
  • Page 119 Troubleshooting Fault messages (cont.) Check that the ignition electrode is correctly installed Check balanced flue system for flue gas recircula- ■ ■ and whether the gasket is damaged. tion. If necessary, replace the ignition electrode and gas- ■ Check the condensate drain and trap for damage, ket.
  • Page 120 Troubleshooting Fault messages (cont.) F.387 System characteristics Measures Burner in a fault state. Check ionisation electrode and connecting cable. If the fault persists, replace the BCU burner control unit. Cause Reset the appliance. Earth fault, ionisation current. BCU burner control unit faulty.
  • Page 121 Troubleshooting Fault messages (cont.) Measures Reset the appliance. Replace the BCU burner control unit. F.401 System characteristics Measures Burner in a fault state. Check IO electrode for earth fault. If the fault persists, replace the BCU burner control unit. Cause Reset the appliance.
  • Page 122 Troubleshooting Fault messages (cont.) F.406 System characteristics Measures Burner in a fault state. Replace the BCU burner control unit. Reset the appliance. Cause BCU burner control unit faulty. F.408 System characteristics Measures Burner in a fault state. Replace the BCU burner control unit. Reset the appliance.
  • Page 123 Troubleshooting Fault messages (cont.) F.417 System characteristics Measures Burner in a fault state. Replace the BCU burner control unit. Reset the appliance. Cause BCU burner control unit faulty. F.418 System characteristics Measures Burner in a fault state. Replace the BCU burner control unit. Reset the appliance.
  • Page 124 Troubleshooting Fault messages (cont.) F.436 System characteristics Measures Normal operation Check flow sensor. Cause Short circuit, flow sensor. F.446 System characteristics Check the flow temperature sensor; see chapter ■ "Flow temperature sensor". Burner in a fault state. ■ If the fault message recurs, replace the sensor. ■...
  • Page 125 Troubleshooting Fault messages (cont.) Measures Reset the appliance. If the fault recurs, replace the BCU burner control unit. F.450 System characteristics Measures Burner in a fault state. Reset the appliance. If the fault recurs, replace the BCU burner control unit. Cause Error in scheduled program run monitoring.
  • Page 126 Troubleshooting Fault messages (cont.) F.455 System characteristics Measures Burner in a fault state. Reset the appliance. If the fault recurs, replace the BCU burner control unit. Cause Error in program run monitoring. F.456 System characteristics Measures Burner in a fault state. Reset the appliance.
  • Page 127 Troubleshooting Fault messages (cont.) F.464 System characteristics Reset the appliance. Burner in a fault state. Note To prevent water damage, detach fan unit before Cause removing the burner. Ionisation current too low during calibration. Differential If the fault is permanently present, replace the compared to previous value not plausible.
  • Page 128 Troubleshooting Fault messages (cont.) F.471 System characteristics Measures No heat demand. ■ Check system pressure sensor (plug ■ Check lead and plug-in connection. Cause ■ Check whether the supply voltage to the sensor is 5 V . System pressure sensor not available, lead break or short circuit.
  • Page 129 Troubleshooting Fault messages (cont.) Measures Note To measure the collector temperature more accurately, ■ Check the following: the solar circuit pump can be periodically started for a – No flow or low flow rate in the solar circuit. short duration. If necessary, activate the interval func- –...
  • Page 130 Troubleshooting Fault messages (cont.) F.530 System characteristics Measures Solar function limited. Check sensor(s), or connect missing sensor(s) to SDIO electronics module. Cause Sensor value not available or lead break of one or more sensors/missing sensor(s). F.538 System characteristics Measures No solar central heating backup with SDIO. Check sensor or connect missing sensor on the SDIO electronics module.
  • Page 131 Troubleshooting Fault messages (cont.) Measures Check commissioning assistant setting. ■ ■ Check setting of ADIO rotary switch. ■ Check flow temperature sensor, mixer 2. ■ Measure voltage at sensor input on electronics mod- ule. Set value: 3.3 V with sensor disconnected F.545 System characteristics Measures...
  • Page 132 Troubleshooting Fault messages (cont.) Measures Measure voltage at sensor input on electronics mod- ule. Set value: 3.3 V with sensor disconnected Check flow temperature sensor, mixer 4. F.574 System characteristics Measures Normal operation without room influence. Check external room temperature sensor in heating circuit or room temperature sensor for remote control Cause unit.
  • Page 133 Troubleshooting Fault messages (cont.) Measures Check external room temperature sensor in heating circuit or room temperature sensor for remote control unit. F.579 System characteristics Measures Normal operation without room influence. Check external room temperature sensor in heating circuit or room temperature sensor for remote control Cause unit.
  • Page 134 Troubleshooting Fault messages (cont.) Measures Check setting of parameter 936.6. Check external room temperature sensor in heating circuit or room temperature sensor for remote control unit. F.584 System characteristics Measures Normal operation without room influence. Check external room temperature sensor in heating circuit or room temperature sensor for remote control Cause unit.
  • Page 135 Troubleshooting Fault messages (cont.) Measures Check temperature sensor TS4. F.669 System characteristics Measures No solar function with preheating active. 2nd cylinder Check temperature sensor TS4. and solar transfer pump not working. Cause Short circuit, DHW preheating sensor TS4. F.670 System characteristics Measures No solar central heating backup.
  • Page 136 Troubleshooting Fault messages (cont.) F.682 System characteristics Measures Burner in a fault state. Check air mass flow rate sensor. Cause Air mass flow rate sensor not available. F.683 System characteristics Measures Burner in a fault state. Check air mass flow rate sensor. Cause Air mass flow rate sensor faulty.
  • Page 137 Troubleshooting Fault messages (cont.) Measures If the fault occurs repeatedly: Check the diaphragm expansion vessel. Top up with water. Vent the system. F.764 System characteristics Measures System in a fault state. As there is a fault code in the auxiliary appliance, this ■...
  • Page 138 Troubleshooting Fault messages (cont.) F.875 System characteristics Check wires and plugs for correct seating. ■ Check connections for contact corrosion. ■ Limited operation of the appliance cascade ■ Check cables for mechanical damage, e.g. crushing, kinking, chafing or breakage. Cause ■...
  • Page 139 Troubleshooting Fault messages (cont.) Ensure that the system is fully vented. If necessary, Check the quick-action air vent valves for leaks and ■ ■ restart the venting program of the heating circuit replace if necessary. (select via service menu). ■ Check the set system pressure (this fault is more ■...

  • Page 140: Status Messages

    Troubleshooting Further messages (cont.) Status messages Message on the display Meaning Fan pre-purge for heating mode S.29 Standard mode for heating S.36 Comfort mode for DHW draw-off S.59 Flue gas temperature sensor test active S.60 Summer mode active (outside temperature economy function) S.74 Heating suppression, heating S.75...

  • Page 141: Shutting Down The Boiler

    Troubleshooting Further messages (cont.) Message on the display Meaning I.93 Can occur along with fault messages F.89, F.797, F.799. F.982, see chapter "Fault messages" I.137 No control restriction: Read out the information message from the Vitodens fault memory. ■ Measures: See installation and service instructions. ■...
  • Page 142 Troubleshooting Repairs (cont.) Draining the boiler on the heating water side Fig. 56 1. Close the shut-off valves on the heating water side. 4. Open air vent valve and drain the boiler as much as required. 2. Connect hose to air vent valve and route it into a suitable container or drain outlet.
  • Page 143 Troubleshooting Repairs (cont.) ■ LED constant green: No communication (pump is running without external control from the boiler controller). ■ LED flashing green: Pump is running with external control (PWM signal) from the boiler controller ■ LED constant red: Pump failure Note The pump is controlled by a PWM signal.

  • Page 144: Checking The Temperature Sensors

    Troubleshooting Repairs (cont.) Checking the temperature sensors 6 5 4 3 2 1 6 5 4 3 2 1 6 5 4 3 2 1 Fig. 58 Heat generator circuit flow temperature sensor 3. Check the sensor resistance. Note position of (dual sensor) guide lug ■...
  • Page 145 Troubleshooting Repairs (cont.) Cylinder temperature sensor/outlet temperature Flue gas temperature sensor sensor 1. Check the lead and plug of flue gas temperature 1. Check lead and plug of cylinder temperature sen- sensor or outlet temperature sensor 2. Disconnect leads, flue gas temperature sensor 2.
  • Page 146 Troubleshooting Repairs (cont.) Flue gas temperature sensor Outside temperature sensor ■ ■ Flow temperature sensor ■ Cylinder temperature sensor ■ Outlet temperature sensor ■ Temperature sensor, low loss header ■ -20 -10 0 10 20 Temperature in °C Sensor type: NTC 10 k Ω...

  • Page 147: Checking The Plate Heat Exchanger

    Troubleshooting Repairs (cont.) Checking the plate heat exchanger 8. 3. Fig. 59 1. Drain the boiler: 5. Check the connections on the heating water and On the heating water side, see page 142 DHW sides for contamination and scaling; replace ■...
  • Page 148 Troubleshooting Repairs (cont.) Removing the hydraulic unit and return pipe If components of the hydraulic unit have to be replaced. 2. 3x Fig. 60...

  • Page 149: Replacing The Power Cable

    Repairs (cont.) Remove the return pipe: Fig. 61 Note After replacing the return pipe, use a new cable tie. Replacing the power cable When replacing the power cable, only use the power cable available as a spare part from Viessmann.
  • Page 150 Troubleshooting Repairs (cont.) Checking the fuse Fig. 62 1. Turn off the ON/OFF switch. 5. Check fuse F1 (see connection and wiring dia- gram). 2. Depending on the configuration: Move program- ming unit together with bracket to service position. Danger Incorrect or improperly fitted fuses can lead 3.

  • Page 151: Control Functions

    Function description Control functions Heating mode The control unit determines a set flow temperature for If a heating circuit without mixer is connected down- the heat generator, subject to the outside temperature stream of the low loss header, the circulation pump or the room temperature and the slope/level of the can be connected to output P2.
  • Page 152 Function description Control functions (cont.) Slope -5 -10 -15 -20 Outside temperature in °C Fig. 63 Slope setting ranges: Reduced room temperature ■ Underfloor heating systems: 0.2 to 0.8 ■ Low temperature heating systems: 0.8 to 1.6 Set room temperature Standard room temperature or comfort room tem- perature Individually adjustable for each heating circuit.
  • Page 153 Function description Control functions (cont.) Room influence factor parameter Heating circuit Parameter 1 (without mixer) 933.7 (only set if just one heating circuit is installed) 2 (with mixer) 934.7 3 (with mixer) 935.7 4 (with mixer) 936.7 Example for determining the increase in the flow tem- perature using the value of the heating curve when the actual room temperature deviates from the set room temperature:...
  • Page 154 Function description Control functions (cont.) Parameter 897.0 "Screed drying": Temperature profile A (EN 1264-4) Days Fig. 67 Temperature profile B (ZV parquet and flooring technology) Days Fig. 68 Temperature profile C Days Fig. 69 Temperature profile D Days Fig. 70 Temperature profile E Days Fig.

  • Page 155: Raising The Reduced Room Temperature

    Function description Control functions (cont.) Temperature profile F Days Fig. 72 Ends after 21 days. Raising the reduced room temperature During operation at reduced room temperature, the The outside temperature limits for the start and end of reduced set room temperature can be automatically temperature raising can be set in parameters 1139.0 raised subject to the outside temperature.

  • Page 156: Dhw Heating

    Function description Control functions (cont.) Reducing the heat-up time The value and duration of the additional increase in the set flow temperature is adjusted in parameters 424.3 During the transition from operation at reduced room and 424.4. temperature to operation at standard room tempera- ture or comfort room temperature, the flow tempera- ture will be raised in accordance with the selected heating curve.
  • Page 157 Function description DHW heating (cont.) After the draw-off process has ended, the loading cyl- inder continues to be heated up until the set DHW tem- perature is reached at the cylinder temperature sensor. Increased DHW hygiene The DHW can be heated to a specified (higher) set Danger DHW temperature (approx.
  • Page 158 Connection and wiring diagram HMU heat management unit Fig. 75 A1 HMU heat management unit Outside temperature sensor A2 HMI programming unit with communication mod- Cylinder temperature sensor ule (TCU 200) Power supply fÖ A3 Power supply unit PlusBus X... Electrical interfaces CAN bus...

  • Page 159: Connection And Wiring Diagram

    Connection and wiring diagram HMU heat management unit (cont.) 230 V floating input, 230 V output. For connecting To BCU burner control unit a floating switching contact, see page 29 To BCU burner control unit Mains voltage output P1 230 V output: Circulation pump for cylinder heat- ing (plug P2 230 V parametrisable output for: ■...
  • Page 160 Connection and wiring diagram BCU burner control unit Fig. 76 PWM Control signal Power supply fÖ X... Electrical interfaces Ignition unit § A/B Flow temperature sensors 1 and 2 Fan motor a-Ö Outlet temperature sensor A Fan motor control a-Ö Ionisation electrode Water pressure sensor Flue gas temperature sensor...

  • Page 161: Commissioning/Service Reports

    Commissioning/service reports Commissioning/service reports Report Settings and test values Set value Commission- Maintenance/ Maintenance/ service service Date Signature Static pressure mbar 57.5 ≤ 5.75 ≤ Supply pressure (flow pres- sure) For natural gas ..mbar See table "Supply pressure" For LPG ..mbar (Commis- sioning ...)
  • Page 162 Specification Specification Gas condensing storage combi boiler Use with single connection Gas boiler, type B and C, category II 2N3P Type B2TH Rated heating output range (to EN 15502) = 50/30 °C (P(50/30)) Natural gas 1.9 to 19 1.9 to 25 1.9 to 32 2.5 to 19 2.5 to 25...

  • Page 163: Specification

    Specification Specification (cont.) Use with single connection Gas boiler, type B and C, category II 2N3P Type B2TH Rated heating output range (to EN 15502) = 50/30 °C (P(50/30)) Natural gas 1.9 to 19 1.9 to 25 1.9 to 32 2.5 to 19 2.5 to 25 2.5 to 32...
  • Page 164 Specification Specification (cont.) Use with single connection Gas boiler, type B and C, category II 2N3P Type B2TH Rated heating output range (to EN 15502) = 50/30 °C (P(50/30)) Natural gas 1.9 to 19 1.9 to 25 1.9 to 32 2.5 to 19 2.5 to 25 2.5 to 32...
  • Page 165 Specification Specification (cont.) Use with single connection Gas boiler, type B and C, category II 2N3P Type B2TH Rated heating output range (to EN 15502) = 50/30 °C (P(50/30)) Natural gas 1.9 to 19 1.9 to 25 1.9 to 32 2.5 to 19 2.5 to 25 2.5 to 32...
  • Page 166 Specification Specification (cont.) Use with multiple connection Gas boiler, type B and C, category II 2N3P Type B2TH Rated heating output range (to EN 15502) = 50/30 °C (P(50/30)) Natural gas 5.6 to 19 5.6 to 25 5.6 to 32 = 80/60 °C (Pn(80/60)) Natural gas 5.1 to 17.5...

  • Page 167: Electronic Combustion Control Unit

    Specification (cont.) Available in the following countries Gas categories 2EK3P 2N3P 2ELw3P The gas condensing boiler is suitable for operation with natural gas containing a hydrogen blend of up to 20 % by volume. Electronic combustion control unit The electronic combustion controller utilises the physi- To achieve optimum combustion control, the system cal correlation between the level of the ionisation cur- regularly carries out an automatic self-calibration;...
  • Page 168 Disposal Final decommissioning and disposal This product can be recycled. Components and fluids For decommissioning, isolate the system from the from the system do not belong in ordinary domestic power supply, secure against reconnection and allow waste. components to cool down where appropriate. All components must be disposed of correctly.

  • Page 169: Ordering Individual Parts For Accessories

    Ordering individual parts Ordering individual parts for accessories Please affix accessory labels with part numbers here. Please specify the relevant part no. when ordering individual parts.

  • Page 170: Manufacturer's Certificate According To The 1St Bimschv [Germany]

    2014/53/EU. Manufacturer's certificate according to the 1st BImSchV [Germany] We, Viessmann Climate Solutions SE, D-35108 Allendorf, confirm that the product Vitodens 222-F complies with the NO limits specified by the 1st BImSchV paragraph 6.
  • Page 171 Keyword index Keyword index Function descriptions..........151 Angle of penetration........... 33 Fuse................. 150 Back draught safety device........58 Gas supply pressure..........49 Boiler, draining on the DHW side....... 62 Gas train ..............48 Boiler temperature sensor........144 Gas type..............47 Burner control unit............160 Gas type conversion..........
  • Page 172 WiFi router..............32 Seal rings, replacing...........47 Wiring diagram............158 Security parameters........... 32 Service menu – Calling up..............93 Viessmann Climate Solutions SE Viessmann Limited 35108 Allendorf / Germany A Carrier Company A Carrier Company Hortonwood 30, Telford Telephone: +49 6452 70-0...

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