Greetings.  This is my first post/question - many more to follow, I'm sure. 

I live in a rental house that has radiant floor heat and a heat recovery ventilator that pulls warm, moist air out of the baths, kitchen, and laundry room and blows outdoor air warmed through the heat exchanger into the living spaces of the house. 

The  fan started making a high pitched noise this week, so I called and they sent out a service guy (plumber).  The air exchange unit is located in the attic against a south facing wall.  The attic is not heated, but the attic is included within the building envelope (insulation against the roof). 

The plumber, after a bit of effort, pulled out the central core of the exchanger - it looks like a pentagon or hexagon prism with zig-zag filter around the perimeter (not the fan or fan motor).  It was frozen - obviously moisture had gotten in and then the cold make up air froze it.  It's been well under freezing here for several weeks.  The plumber said the ice was restricting the airflow causing the fan motor to work harder.

The plumber changed two small rectangular air filters where the ductwork enters the HRV, put everything back together, turned the fan on, and the sound was gone.  He said the system would be fine. After he left, I checked the air blowing into the house, and it felt like air conditioning - which I really don't need in the dead of winter.

My concern:  When the ice melts, and the water sits within the HRV, will I have a mold problem?

The system looks like it has a light to show that it is frosted up and might auto shut off, but obviously that didn't work. 

Thoughts?  Should I pull the ice core out and let it thaw and dry and reinsert it?  I can live without the air circulation for a couple of days.

Many thanks.

Views: 4101

Reply to This

Replies to This Discussion

It really becomes a what house, what occupancy, what climate question. I like ERVs, but it really depends. What do you want to do with latent heat, expell, keep out, or keep in? You might want both cores, switching between summer and winter.

I'm not sure it makes à huge difference unless the house is crazy tight. The issue is how yoh want/need to manage moisture.

RSS

Videos

  • Add Videos
  • View All

Twitter

Latest Activity

Profile IconBarbara Smith and Carl Johnson joined Tom White's group
Thumbnail

Weatherization

Share your concerns and successes as a weatherization professional, or information for this…See More
1 hour ago
Carl Johnson replied to Joel Greenberg's discussion The Truth About Windows? in the group Weatherization
"I think the appeal of replacing windows is largely on the aesthetics for most homeowners. Nobody…"
1 hour ago
Carl Johnson commented on Amber Vignieri's blog post Chicago Winter No Match for Retrofitted Logan Square Building
"Beautiful home! Did Josh replace the windows as well or no? Living in Chicago myself, I know about…"
1 hour ago
Carl Johnson commented on Diane Jackson's blog post Two Addison Projects Win Housing Innovation Awards
"These homes look great! Congrats!"
1 hour ago
Carl Johnson is now a member of Home Energy Pros
2 hours ago
Paul Scheckel posted a blog post

Renewable Rant: Traditional Energy!

Why, when I open up a newsletter or market evaluation report about “traditional energy” markets, do…See More
yesterday
Rob Madden, Solar Home Broker's discussion was featured

Indoor Air Quality Monitors and Meters

I'm considering purchasing the AirAdvice for Homes indoor air quality monitor but it seems to have…See More
yesterday
Luis Hernandez's discussion was featured

ERV Configuration

Greetings everyone,     I did an energy audit on this new home that is too tight and needs…See More
yesterday

© 2016   Created by Lawrence Berkeley National Laboratory.   Powered by

Badges  |  Report an Issue  |  Terms of Service