FAQ

Please review our FAQs below and don't hesitate to contact us if you have any additional questions.

Can the ERV/HRV system be use in both retrofits and new construction applications?

Yes, Zehnder’s Comfosystems are ideal for both applications to provide optimal indoor air quality.

How easy is the ERV/HRV system to install?

Because Zehnder designs whole-house ventilation systems, components easily fit together. This integrated functionality allows for a more rapid system installation saving both time and money for both the installer and the end user.

Why should I install a ventilation system?

A user-independent supply of fresh air is necessary as buildings become increasingly air-tight. Today’s new builds and refurbishments demand ventilation concepts for protection against moisture, which prevents mildew formation and helps retain the value of the property. Advantages include energy savings of up to 50%, pollen-free air for allergy sufferers and generally improved comfort.

Does a ventilation system increase energy consumption?

A ventilation system with heat recovery considerably reduces your energy consumption. The energy won from the extract air is approximately 15 – 20 times greater than the energy consumed by the highly efficient DC motors of the ventilation device.

Can the air in a ventilation system become too dry in winter?

When cold outside air is heated to room temperature its relative humidity drops and the air feels dry. The same applies to window ventilation. Zehnder has the enthalpy heat exchanger for this application. It provides heat recovery and recovers moisture from the extract air.

Can I hear noises from neighboring rooms through my ventilation system?

Zehnder air distributors are designed such that there is no direct connection between rooms. All air ducts lead directly from the manifold to the respective rooms. Noise transmission via the air distribution network does not occur.

How can dust in the air pipes be prevented?

Dirt particles in the outside air are removed by the filter in the ventilation device. In addition, extract air filters and the special, smooth internal walls in the air ducts prevent dirt deposits. The distribution system is designed to allow easy cleaning of the air ducts.

Can the HRV/ERV unit be tied into a central HVAC ducting system?

No, it will cause an extreme imbalance between the fresh and extract air. The unit will not be able to function as designed and will greatly decrease transfer efficiency. Novus units are an exception, but still not recommended. It will only provide adequate ventilation to all rooms when the large central HVAC fan is running which is generally only a portion of the year.

Can the system with Geothermal Heat Exchanger (comfofond) be used to heat and cool my home?

No, it will preheat or precool the incoming air keeping the core from freezing and making the unit more efficient. For a 2000 sf house, the amount of cooling it can provide is usually less than 2000 BTUs (for humid climates this will slightly dehumidify the air). It will however help redistribute the conditioned air for a more even household temperature.

How do I connect the wireless boost switch to my HRV?

1) Install the battery being careful to not bend the prongs (that go up the side of the battery and wrap to the top side, not bent down under the battery). 2) Unplug the HRV unit from the outlet and then plug it back in. This action now gives you a 10 minute window where the HRV is open to switch synchronization. 3) Simultaneously press the “1” button and the clock button on the boost switch. You will need to hold these for 10-15 seconds. During this time you will see the indicator lights on the switch blink on and off in random seeming patterns. Once the switch is synched both indicator lights will come on green for about a second and then you can release the buttons. 4) Test the switch to insure that the synchronization worked. 5) If you need to synch another switch, do these steps again for the second switch (and third, fourth, however many you need).