Measurement module


for iZZi 302 ERV ventilation unit

Measurement module for reQnet iZZi 302 ERV, measuring the level of carbon dioxide concentration and humidity in the building, allows the automatic operation of the ventilation unit based on the air quality in the home. Designed for self-installation inside the central unit.

The module is not compatible with the older version of the iZZi 300 ERV ventilation unit.

What does automatic performance control give us?

Energy savings

Thanks to the optimal operation of the device adjusted to the current conditions prevailing in the house.

Autonomous operation

Without the need for user involvement in the daily operation of the recuperation

Higher air quality in the home

means improving the comfort and health of the family

Why ventilation control is necessary?

The main task of ventilation is to maintain the best possible air quality inside the building. In the case of mechanical ventilation, this is achieved by exchanging air in the home – removing used air from inside and supplying fresh outdoor air. However, the demand for fresh air varies, depending on many factors and constantly changes throughout the day. Therefore, to ensure that ventilation fulfills its basic task, it is necessary to control its efficiency accordingly.

Improper ventilation control and its consequences?

If the recuperator exchanges too little air – compared to the demand, then the concentration of carbon dioxide and other pollutants will increase. This will ultimately lead to a significant deterioration in air quality, negatively affecting the well-being and health of residents.

So why not ventilate more intensively all the time?

Because too much ventilation of the rooms will lead to a rapid decrease in air humidity in winter, which will have a very negative impact on the comfort of residents’ lives. In addition, higher efficiency means higher electricity consumption, increased noise from the installation, and greater heat loss.

Greater than required air exchange primarily results in:

  • Excessively dry air in winter,
  • Increased heat loss,
  • Faster filter fouling,
  • Higher power consumption by fans,
  • Increased installation noise.

How to ventilate properly?

In household ventilation systems, standard practice involves controllers that allow manual adjustment of ventilation efficiency or the setting of a weekly schedule in which airflow rates are specified for certain times of the day. In practice, however, many people only use the manual mode and adjust the efficiency as needed because it’s often difficult to predict in advance, for example, during which hours and how many people will be in the home. However, the human nose isn’t very sensitive, and we can’t determine, for example, the carbon dioxide concentration in the air.

And it depends on it how we feel, our concentration, and how we sleep at night. That’s why manual control is so imperfect.

The solution is automatic control based on what is currently happening in the building. And sensors provide us with such information. Installing a CO2/humidity measurement module in iZZi series units allows for very precise and, above all, automatic control of fan operation without additional user involvement.

How does automatic control work in iZZi?

Breathing, humans consume oxygen and produce carbon dioxide. Based on this, through a specially developed algorithm, the system analyzes the behavior of the occupants. When their activity increases or there are more people in the house, the automation recognizes the increase in CO2 levels and smoothly adjusts the operation of the fans accordingly. The automation can also recognize activities such as cooking or taking a shower. This is all possible because the system measures the average humidity value from a few hours ago and can react even to minimal changes in humidity in the home – and it works at any time throughout the year.

One sensor in the central unit, or several in the house?

Can you control the efficiency of the ventilation system knowing only the averaged air quality in the house? Of course, yes! It is much more difficult, but thanks to our specially developed algorithm, reQnet ventilation systems can do it – independently and more accurately than ever before. High-quality self-calibrating CO2/humidity sensors are very expensive, so installing them in every room is economically unjustified. Moreover, we always ventilate the entire building anyway.

How does the recuperator know that the CO2 concentration is higher in one room and lower in another?

The reQnet algorithm recognizes the upward and downward trends in the CO2 level in the building, and since we always ventilate the entire house, the ventilation aims to equalize and thus reduce its level. Therefore, the automation always adjusts the operating parameters to achieve the best conditions in all rooms.