Controlling MVHR-units with a controller

Healthy and clean indoor air is very important for your health. The correct setting of your MVHR unit is a major contributor to this. Too low a setting means that the house is not properly ventilated, which means that pollutants stay in the house longer. Too high a setting means that the MVHR unit has to work extra hard, using energy unnecessarily. It is therefore very important to set an MVHR unit to the correct setting. Read on to find out how you can use an MVHR to always ventilate at the right setting.

Jessie Claessens

September 28, 2023

What should I consider when choosing an MVHR controller?

Choosing the right controller can be very difficult due to the many choices available. The most important thing when choosing the right switch or controller is that it is compatible with the specific MVHR unit in the house. Each controller is unique and will only work with the MVHR unit for which it is designed.

When choosing the right controller, it is important to consider the presence of any moisture or CO2 sensor.

Does the MVHR system have a humidity or CO2 sensor?

Select a controller suitable for a sensor. These have an automatic setting where the ventilation unit will always operate on the sensor unless you manually set it to a different setting.

Does the MVHR system not have a humidity or CO2 sensor?

Then select a controller suitable for a unit without a sensor. This will give you complete manual control of the setting at which the MVHR unit operates.

If the MVHR unit is equipped with an RF receiver, you can operate the MVHR unit with a Radio controlled controller. The completely wireless technology allows you to use the controller anywhere in the house. Couple the control easily and quickly to the appropriate MVHR unit.

At what setting should I set the MVHR unit?

Each controller is unique and has different modes at which the MVHR unit can operate. View all controllers for MVHR units directly here.

Sensor operated MVHR-system

If you have a controller that is compatible with a sensor, it is best to set the control to automatic or sensor mode. This way, you allow the sensor do its job and, based on the humidity levels, it determines which setting is best for the MVHR unit to operate on.

2-step switch

When using a 2-position switch, the MVHR unit should always operate in the correct position.

Position 1: When people are present in the house, the MVHR unit should operate atsetting 1.
Position 2: When showering or cooking, the MVHR unit should operate at setting 2 to filter and ventilate the humidity in the house as quickly as possible.

3-step switch

When using a 3-position switch, the MVHR unit should always operate in the correct position.

Position 1: When nobody is at home, the MVHR unit should operate at the lowest setting (step1) to ensure a permanently ventilated house.
Position 2: When people are present in the house, the MVHR unit should operate at setting 2.
Position 3: When showering or cooking, the MVHR unit should operate at setting 3 to filter and ventilate the humidity in the house as quickly as possible.

Tip: run the ventilation system at the highest setting for at least 20 minutes after showering or cooking so that all moist air and fabrics are fully ventilated.

Never turn off the MVHR unit, even when you are on holiday! This will cause moisture to build-up and create harmful humidity problems in your home. Want to know more about leaving mechanical ventilation on when you are on holiday or away? Read the blog here