Vaillant VR 40 - additional electric module (eBUS), 2 of 7 additional functions
Code: 0020017744Product detailed description
Vaillant VR 40 - additional electrical module (eBUS), 2 of 7 additional functions
The Vaillant VR 40 is a universal multifunctional electrical module that, when connected to the eBUS, extends the standard equipment of a Vaillant boiler or system controller with two additional optional functions from a total range of seven possible additional functions. It is one of the most versatile add-on modules in the Vaillant control technology portfolio precisely because its specific use is adapted to the needs of a given installation - during commissioning, the installer or designer selects which two of the offered functions the module will provide in a given configuration.
Typical functions the VR 40 module can provide include, for example, controlling the domestic hot water circulation pump (based on a time program or demand), controlling the system circulation pump in the heating circuit, controlling the charging pump of the hot water cylinder, operating a flue gas damper when several appliances share a common flue, or controlling an external gas valve in specific safety configurations. It is precisely this flexibility that makes the VR 40 a popular choice for more complex installations where the standard equipment of the boiler or system controller is not sufficient to cover all required additional functions.
Main technical features
- Multifunctional electrical module connected to the eBUS of a Vaillant boiler or system controller.
- Allows simultaneous activation of two of seven available additional functions according to the needs of a specific installation.
- Available functions include, for example: control of the DHW circulation pump, control of the system/charging pump, operation of the flue gas damper, control of an external gas valve, and other additional outputs according to current manufacturer documentation.
- Configuration of the specific two functions is carried out in the system controller menu or directly on the module during commissioning.
- Compatible with a wide range of Vaillant boilers with an eBUS interface, including the latest ioniDETECT generation.
- Compact design for installation in the boiler's control cabinet or in its immediate vicinity.
Overview of possible module functions
| Function | Typical use |
|---|---|
| DHW circulation pump control | Instant availability of hot water at draw-off points far from the cylinder |
| System circulation pump control | Separate heating circuit independent of the boiler's internal pump |
| DHW cylinder charging pump control | External hot water cylinder connected outside the boiler body |
| Flue gas damper control | Shared chimney/flue for several appliances |
| External gas valve control | Additional safety shut-off of the gas supply |
| Operating/fault status signalling | Connection to external signalling or a building management system |
| Other additional outputs | According to current technical documentation and firmware version |
The exact list of available functions and their combinability may vary slightly depending on the specific boiler model and system controller version, so we recommend checking with our technical team before ordering which two functions you need for your specific project, to ensure correct configuration already at the first installation.
How module configuration works
After physically connecting the VR 40 module to the eBUS of the boiler or system controller, a menu of available functions appears in the controller's service menu, from which the installer selects exactly the two required for the given installation. This configuration is carried out once during system commissioning, and if the installation's functional requirements change later (for example, additionally adding a circulation pump), the module's configuration can be reconfigured at any time without the need to replace the hardware itself.
This flexibility is the main added value of the VR 40 module - instead of having to order and stock several different specialised modules for each individual function, one universal module is sufficient, which is configured exactly according to the current project needs, which also simplifies spare parts logistics for service organisations.
Compatibility and related components
The VR 40 is compatible with Vaillant boilers equipped with an eBUS interface, including the latest generation of condensing boilers with the ioniDETECT control board. For installation of the module directly under the ioniDETECT boiler body, a specialised plastic mounting bracket is available (a separate product), as is an alternative bracket designed for the eloBLOCK series of electric boilers. The module can also be combined with other add-on modules on the eBUS (for example, VR 32 for cascade wiring or VR 34 for connection to a building management system), if required by the specific installation topology.
Installation
Installation of the VR 40 module consists of mounting it in the boiler's control cabinet (possibly using a specialised mounting bracket for newer ioniDETECT or eloBLOCK models), connecting the power supply, connecting to the eBUS, and wiring the relevant output/input circuits according to the two selected functions (for example, the power cable to the circulation pump or the signal cable to the flue gas damper). After the physical connection, the required functions are configured in the controller's service menu and their correct operation is verified. Given the variety of possible wiring configurations (both power and signal circuits, different types of connected peripheral devices), we always recommend entrusting the installation to a qualified service technician.
Typical usage scenarios
The VR 40 module is most often used in more complex installations exceeding the standard equipment of an ordinary family house - for example, in larger houses or apartment units with a hot water circulation circuit for instant availability of hot water at more distant draw-off points, in installations with a separate system pump independent of the boiler's internal pump, in configurations with a shared chimney requiring a controlled flue gas damper, or with external hot water cylinders requiring a separate charging pump controlled by the boiler.
Due to its versatility, the VR 40 is often part of the design documentation for larger installations, where the designer defines in advance the exact two functions needed for the given building based on a complete hydraulic and electrical design of the heating system.
Why choose this module
The main advantage of the VR 40 module is its versatility and flexibility - a single hardware module can cover a wide range of additional functions according to the current project needs, which simplifies design, reduces the number of different stock items for installation and service companies, and allows the configuration to be changed later without replacing the hardware if installation requirements change (for example, when additionally adding a hot water circulation circuit to an already functioning installation).
Maintenance
The VR 40 module does not require special maintenance. If any discrepancies occur in the operation of one of the configured functions (for example, the circulation pump does not switch on as expected), we recommend first checking the correctness of the function's configuration in the controller's service menu and the physical wiring of the relevant conductors, or contacting a service technician for further diagnostics.
Frequently Asked Questions (FAQ)
Can I later change which two functions the VR 40 module provides?
Yes, the function configuration is set via software in the controller's service menu and can be changed at any time without replacing the module itself, provided the relevant physical wiring required for the new function is in place.
Do I need two VR 40 modules if I want three additional functions?
Yes, since one VR 40 module always covers only two functions at a time, a further VR 40 module or another suitable add-on module is required for a third and any additional function, depending on the specific requirement - we recommend consulting our technical team.
Is the VR 40 module compatible with ioniDETECT boilers?
Yes, the VR 40 is fully compatible with the latest generation of Vaillant boilers with the ioniDETECT control board, for which a specialised module mounting bracket is also available.
Which functions are most commonly chosen by customers?
In practice, the most commonly chosen functions are control of the domestic hot water circulation pump and control of a separate system or charging pump, as these needs occur in a large proportion of larger family houses as well as apartment installations.
Economic and design perspective
From the investor's and designer's point of view, the universal VR 40 module is more advantageous than several specialised single-purpose modules, as it reduces the number of different items that need to be stocked by the service organisation, while also allowing flexible response to changing requirements during project implementation without the need for additional hardware procurement. This versatility is particularly appreciated in larger or more complex projects, where the exact requirements for additional functions may only be finalised at a later stage of implementation.
Hot water circulation - the most common function in practice
One of the most frequently chosen functions of the VR 40 module is control of the domestic hot water circulation pump. In larger houses or apartment units with draw-off points far from the hot water source (for example, a bathroom at the opposite end of the layout from the boiler or cylinder), without circulation users would have to wait each time they open a tap for the cooled water in the pipe to drain and be replaced by genuinely hot water from the source. The circulation pump controlled by the VR 40 module keeps hot water continuously circulating in the pipework (usually according to a set time program reflecting typical usage hours), so hot water is available almost instantly at every draw-off point.
Although this function slightly increases energy consumption (circulating water loses heat to its surroundings while passing through the pipework), it significantly increases comfort of use and reduces the waste of water that would otherwise have to run into the drain while waiting for hot water. Modern systems therefore allow precise time programming of circulation only for periods of actual use (for example, morning and evening peaks), minimising energy loss while maintaining a high level of comfort.
Control of a separate system pump
The second commonly chosen function is control of a separate system (circulation) pump in the heating circuit, independent of the internal pump built directly into the boiler. This configuration is used, for example, in large heating systems with high hydraulic resistance (long pipe runs, several heating circuits), where the boiler's internal pump may not have sufficient flow capacity to overcome the pressure loss of the entire system. An external, more powerful system pump controlled by the VR 40 module then ensures reliable circulation of heating water throughout the entire system, independent of the limitations of the boiler's internal pump.
Flue gas damper control with a shared chimney
In installations with a shared flue gas outlet for several appliances (for example, several boilers sharing a single chimney), it is necessary for safety reasons to ensure that flue gases from an inactive appliance do not flow back into the room through its own outlet. In this configuration, the VR 40 module can control a motorised flue gas damper that only opens during actual operation of the given boiler and otherwise remains closed, preventing unwanted flow of flue gases or air in the opposite direction in the shared chimney system.
Additional frequently asked questions
Does hot water circulation significantly increase energy consumption?
There is a slight increase, however with correct time programming of circulation only for periods of actual use (instead of continuous operation), this loss is significantly limited, while the comfort and water savings from avoided cold water drainage are considerable.
Is external power supply needed for the controlled peripherals (pump, damper)?
Most controlled peripherals (pumps, dampers) require their own 230 V power supply, which the VR 40 module only switches/controls - the exact wiring depends on the specific type of peripheral and should be part of the electrical design documentation.
Ordering recommendation
When ordering the VR 40 module, we recommend defining in advance exactly which two functions the module will provide in the given installation, and checking the availability of the required peripherals (pump, damper, valve) in the project. If you are not sure of the exact configuration suitable for your specific boiler type and intended function, our technical team will be happy to help you choose the right combination of functions before ordering, to avoid any complications during installation.
Summary
The Vaillant VR 40 is a universal multifunctional module enabling the activation of two of seven available additional functions of a Vaillant boiler or system controller - from controlling the circulation or system pump to operating a flue gas damper or an external gas valve. Thanks to its software-configurable functionality, it represents a flexible and cost-effective solution for more complex heating installations that go beyond the standard equipment of an ordinary family house.
Additional parameters
| Category: | Vaillant Controls |
|---|---|
| Warranty: | 2 years |
| Device type: | Multifunctional electrical module (eBUS) |
| Number of active functions: | 2 of 7 available |
| Example functions: | DHW circulation pump, system/charging pump, flue gas damper, external gas valve |
| Compatibility: | Vaillant boilers with eBUS interface, including ioniDETECT |
| Configuration: | Via software in the controller's service menu, changeable at any time |
| Installation: | In the boiler's control cabinet, optionally on a mounting bracket (ioniDETECT/eloBLOCK) |
| Country of origin: | Germany |
| Manufacturer: | Vaillant |
| Warranty: | 2 years |
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O spoločnosti
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Do bohatého portfólia Vaillant Group patria moderné technológie vykurovania, ktoré sú energeticky úsporné, efektívne a prispievajú k ochrane životného prostredia. Vďaka širokému spektru produktov a modelov si tu každý zákazník nájde presne to, čo potrebuje. Sortiment zahŕňa závesné a stacionárne kotly, zásobníky teplej vody či elektrické spotrebiče. Na trhu závesných kotlov je spoločnosť s 26 percentným podielom dokonca číslom jedna v Európe. Vaillant Group sa nešpecializuje len na vývoj a výrobu kotlov, do jej produktového portfólia patria aj technológie využívajúce obnoviteľné zdroje energie, ako sú solárne systémy či najmodernejšie tepelné čerpadlá a klimatizácie. Užívateľom ponúka tiež rekuperačné alebo kogeneračné jednotky či zeolitové tepelné čerpadlá.
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