January 22, 2013

No Freezing Means No Defrost Mode for Lunos e² High-Efficiency Ventilation

Today’s high efficiency heat exchange ventilation systems conserve energy while providing exceptional indoor air quality and comfort.

Yet the performance can be adversely effected in cold climates when temperatures dive below freezing for extended periods of time and the ventilation units go into “defrost mode”.   Defrost mode is really a freeze-prevention mode where the air flow is significantly slowed or stopped altogether, and/or a supply-stream pre-heating element is activated.   These defrost mode precautions decrease the quality and/or efficiency of the ventilation provided.

cross section of Lunos e2

Lunos e2 does not require and does not have a defrost mode, because the ceramic heat-exchange core never freezes.  The units have been tested down to a temperature of  -31°F with relative humidity of 80% without any problems.   The units are successfully operating through the winter without freezing in Norway, Estonia, Kazakhstan and Russia.

With this inherent anti-freeze capability, no matter how inhospitable the winter outside, the Lunos e2 provides truly continuous ventilation while conserving  energy – ensuring a comfortable, sustainable and healthy interior environment.  Find our more here.

Related Posts:



, , , ,

Tweet about this on TwitterShare on FacebookShare on LinkedInPin on PinterestEmail to someone

6 Responses to No Freezing Means No Defrost Mode for Lunos e² High-Efficiency Ventilation

  1. Martin Holladay January 24, 2013 at 3:46 pm #

    I’m not quite sure what you mean when you write, “the ceramic heat-exchange core never freezes.” Surely the ceramic core gets colder than 32 degrees F — doesn’t it? If the indoor temperature is 70 degrees F, and the outdoor temperature is -30 degrees F, then the temperature of the ceramic core is probably something like 20 degrees F. Right?

    Perhaps you mean something like, “Even when the core freezes, it doesn’t cause any problems.”

  2. Ken Levenson January 24, 2013 at 4:13 pm #

    Hi Martin,
    We went back and forth with the factory a fair amount of times and the word is that the core material doesn’t freeze – while the air within the core can reach freezing temps, it’s not enough to cause problems. I’ll triple check though – and get back to you.

  3. robert haverlock January 21, 2015 at 10:08 pm #

    So, what has happened since?

  4. robert haverlock January 21, 2015 at 10:29 pm #

    Also, I believe that it really it acts like a thermal insulator! Heat transfer is higher on ceramic then transferring to cooling mode..so…?

  5. ben May 2, 2018 at 10:10 am #

    any problems with how they work at -30 F with 100% humidity! lunos e2

    • John May 2, 2018 at 1:17 pm #

      At very low temperatures air is not capable of holding much water, it’s very dry. So although relative humidity may be high, exterior freezing is not an issue. If you are generating a lot of interior humidity, we have seen icicles form on the outside in the dead of winter, but they are pencil thin. We haven’t seen any icicles cause issues even for those operating in Alaska or Maine.

Leave a Reply