Vaillant VR 91f - wireless remote control for multiMATIC 700f, with room thermostat and hygrometer

Product detailed description

Vaillant VR 91f - wireless remote control for multiMATIC 700f, with room thermostat and hygrometer

Vaillant VR 91f is a wireless remote control designed as an additional or replacement control element for the multiMATIC 700f system controller. The device combines the function of a room thermostat (measuring and setting the desired temperature in the reference room), a hygrometer (measuring the relative humidity of the air at the installation location) and a backlit display for comfortable operation even in reduced visibility, for example in the evening. Thanks to wireless radio communication with the multiMATIC 700f controller, there is no need to run a cable connection between the control panel and the controller itself, which significantly simplifies installation, especially in cases where the reference room (typically the living room) is not in the immediate vicinity of the boiler room or utility room where the boiler and system controller are located.

The VR 91f is used in two main scenarios: either as the main control element of a wireless multiMATIC 700f installation from the very beginning, or as a replacement part in case of damage to or loss of the original remote control of an existing installation. In both cases, it provides the user with convenient access to setting the desired temperature, the heating time program, and an overview of the current conditions in the reference room directly from the place where they normally stay, without having to walk to the boiler or the main control panel.

Main technical features

• Wireless (radio) remote control designed for the multiMATIC 700f system controller.
• Integrated room thermostat measuring and displaying the current and desired temperature in the reference room.
• Integrated hygrometer measuring the relative humidity of the air at the installation location - a useful indicator for preventing mould growth and for indoor comfort.
• Backlit display for comfortable reading of data and control even in reduced lighting.
• Battery-powered (wireless design), allowing flexible placement without the need for an electrical connection at the installation site.
• Possibility of free placement on the wall or on a table stand (depending on the specific package) in the reference room.

How the remote control works with the multiMATIC 700f controller

The multiMATIC 700f system controller is a weather-compensating controller with a weekly time program for the direct heating circuit, communicating with the boiler via the eBUS bus. The VR 91f serves as a wireless remote control panel of this controller located directly in the reference room - it measures the current room temperature and humidity there and wirelessly sends this data to the main controller, which, together with the weather compensation curve (the dependence of the desired heating water temperature on the outdoor temperature), uses it to precisely control the boiler's output. The user can directly on the VR 91f display change the desired temperature, view and adjust the weekly time program, or switch operating modes (for example comfort, setback or frost protection mode), with all changes immediately transmitted to the main controller via wireless signal.

Humidity measurement also allows the controller (in combination with other system functions, if available) to warn of the risk of condensation or unsuitable humidity conditions in the room, which helps prevent mould growth, especially in new buildings or well-sealed buildings with low air infiltration.

Compatibility and related components

The VR 91f is designed specifically for the multiMATIC 700f system controller. For the older, wired version of the controller (multiMATIC 700 without "f"), a different, wired remote control VR 91 (without "f") is used, which is not interchangeable with the wireless VR 91f. For the sensoCOMFORT 720f controller, the analogous wireless control element VR 92f is intended. In larger wireless installations, the range of the radio signal can be extended using the VR 52 signal booster (a separate product) if the reference room is too far away or there is significant signal attenuation between it and the controller (for example thick concrete walls).

Installation

Installation of the VR 91f consists of pairing it with the main multiMATIC 700f system controller according to the procedure described in the installation manual - this process usually involves activating the pairing mode on both devices and confirming a successful connection. After successful pairing, the device is placed at the chosen location in the reference room (on the wall or as a free-standing element) so as to best represent the average temperature of the living space - it is recommended to avoid direct sunlight, proximity to heat sources (radiator, fireplace, electrical appliances) or drafts from doors and windows, which could distort the measured temperature.

The batteries need to be replaced when their discharge is indicated on the device's display - this replacement is simple and does not require professional intervention, as it does not involve intervention in the boiler's electrical wiring.

Typical use scenarios

The VR 91f is suitable primarily for family houses and apartments with a multiMATIC 700f controller, where the reference room (typically the living room) is far from the boiler room, or where running a cable connection would be structurally complicated or costly (for example during a renovation without the possibility of chasing new wiring). It is also a practical solution when replacing a damaged or lost original control panel of an existing installation, as wireless pairing with an existing controller is easier than additionally running new cables.

Why choose the VR 91f

The main advantage of the VR 91f is the combination of the convenience of wireless installation with the full functionality of a room thermostat, including humidity measurement and a backlit display. The user thus gains a complete overview and control of heating directly from the living space without having to walk to the boiler, while wireless communication eliminates the need for additional wiring during installation as well as in case of a future change in the location of the control panel.

Maintenance

The VR 91f does not require special maintenance apart from occasional battery replacement when discharged. We recommend keeping the display clean with a dry cloth and avoiding placement in an environment with excessive humidity or direct contact with water.

Frequently Asked Questions (FAQ)

Air humidity and living comfort - why it matters

Relative air humidity in living spaces significantly affects the subjective feeling of thermal comfort, indoor air quality, and the risk of mould growth in cooler parts of the structure (for example room corners, areas around windows). The recommended relative humidity for living spaces is generally in the range of approximately 40 to 60%, and values significantly outside this range may indicate either insufficient ventilation (high humidity, risk of mould) or, conversely, excessive drying of the air (for example during intensive heating without adequate humidification), which can cause irritation of the respiratory tract or dry skin. The integrated hygrometer in the VR 91f provides the user with a continuous overview of this value directly on the remote control display, without the need for a separate measuring device.

Wireless vs. wired control - when to choose which

Remote control via the myVAILLANT app

The multiMATIC 700f system can also be supplemented with an internet gateway (for example the sensoNET VR 920/VR 921 module), which allows the entire heating system to be connected to the myVAILLANT app on a smartphone. In such a combined setup, the VR 91f serves as a local control panel directly in the reference room for everyday temperature and time program settings, while the myVAILLANT app offers remote access to the system from anywhere with an internet connection - for example to turn on the heating before arriving home, or to check the heating status while on holiday. Both control methods (local via VR 91f and remote via the app) work simultaneously and change the same settings shared by the entire system.

Placement in the reference room - practical recommendations

The accuracy of temperature measurement, and thus the overall quality of heating control, largely depends on the correct placement of the VR 91f remote control in the reference room. We recommend choosing a centrally located living room (most often the living room), where household members normally spend the most time, and avoiding placement near exterior doors, windows, radiators, fireplaces, TVs or other heat sources that could locally distort the measured temperature compared to the actual room average. The recommended wall mounting height is approximately 1.2 to 1.5 metres above the floor, i.e. at normal seating level, where the temperature is representative of the residents' thermal comfort.

When choosing between wall mounting and free-standing placement on a table or shelf, also consider the practicality of daily operation - wall mounting is more stable and less prone to accidental relocation, while free-standing placement allows for easier repositioning as needed.

Operating modes and their use

The VR 91f, in conjunction with the multiMATIC 700f controller, offers several operating modes adapted to various situations in the household - comfort mode maintains the set temperature according to the time program, setback (economy) mode reduces the temperature, for example during absence or at night, and frost protection mode protects the building from freezing during longer absences (for example during a winter holiday) with minimal energy consumption. Switching between these modes can be done directly from the VR 91f display without the need to access the main controller at the boiler.

Additional frequently asked questions

Summary

Vaillant VR 91f is a wireless remote control with a room thermostat and hygrometer, designed as a convenient control element for the multiMATIC 700f system controller. Thanks to wireless communication, a backlit display and humidity measurement, it provides the user with a complete overview and control of heating directly from the reference room, without the need for complex wiring during installation. It is a suitable solution both for new installations and for replacing a damaged control panel of an existing system.