Need help?Do you have a question about the Vaillant VR 66 and is the answer not in the manual?
Explains symbols used in the manual for clarity and guidance.
Highlights the need to follow all enclosed operating and installation instructions.
Instructs to pass documents to the user for future reference.
States that instructions apply exclusively to the specified product.
Provides crucial safety advice for installation and operation of the equipment.
Warns about severe injury or death from touching live connections.
Alerts to risks of leakage and explosion from incorrect gas line installation.
Warns about flue gas escape through openings in the flue pipe.
Highlights risks associated with missing or faulty safety devices.
Warns about scalding risks from hot water, especially for vulnerable users.
Cautions against non-professional work causing damage or injury.
Warns about damage from unsuitable additives in heating water.
Alerts to damage risks from using improper tools or methods.
Warns about leakages and potential structural damage from incorrect installation.
Details legal and regulatory requirements for installation in various regions.
Specifies regulations for domestic hot water circuits and connections.
Outlines requirements for earthing, wiring, and power supply connections.
Introduces the control unit and its system compatibility.
Details the internal components and modes of operation.
Describes compatibility and functionality of the monozone mode.
Explains priority levels for heating and hot water operations in boilers.
Details wiring and setup for monozone mode with a 3-port valve.
Illustrates setup for monozone mode with two 2-port valves.
Explains compatibility and limitations of the multizone operation mode.
Shows wiring for multizone mode with DHW cylinder.
Details multizone mode configuration for combi boilers.
Identifies product type and serial number via the data plate.
Explains the information contained on the product's data plate.
Guides on choosing a suitable location and taking precautions for installation.
Advises on selecting an appropriate site for the appliance.
Provides instructions on how to physically mount the control unit.
Details the steps for opening the control unit housing.
Explains the process and considerations for wall-mounting the control unit.
Covers essential safety and procedural aspects of electrical connections.
Details the wiring points and circuit board connectors on the unit.
Shows the layout and connectors of the main electronic board.
Outlines procedures for filling the boiler and heating circuit.
Refers to boiler commissioning instructions.
Details manual steps for opening heating circuit valves.
Explains how to purge air from the heating circuit.
Guides on purging air after opening circuit valves.
Specifies the correct order for switching on connected appliances.
Describes pairing room thermostats with the control unit in multizone mode.
Details final checks and operational tests after commissioning.
Lists installer responsibilities for informing the end-user.
Provides guidance on diagnosing and resolving common faults.
Lists initial checks before proceeding with specific diagnostics for faults.
Warns about replacing the main supply cable by qualified personnel.
Instructs on sorting and recycling product packaging materials.
Explains procedures for recycling electrical and electronic equipment.
Outlines conditions for Vaillant manufacturer warranty.
Recommends regular servicing and how to arrange it.
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General