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: 1903

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

Home Energy Pros

Home Energy Pros was founded by the developers of Home Energy Saver Pro (sponsored by the U.S. Department of Energy,) and brought to you in partnership with Home Energy magazine.

Latest Activity

Jan Green replied to George Kopf's discussion Real Estate Professionals need our support - but how?
"Craig, I like your thinking!  With my new broker, I've been able to communicate more…"
8 minutes ago
Craig Foley replied to George Kopf's discussion Real Estate Professionals need our support - but how?
"Thanks Jan, your insight, as always, is invaluable. Your suggestions regarding a top down approach…"
23 minutes ago
Hal Skinner replied to Hal Skinner's discussion An example of what an RCC can do with no R- insulation in the walls.
"Brett, you just asked the million dollar question when it comes to OUR coating. Now I will let the…"
35 minutes ago
Melissa Ulbricht commented on Melissa Ulbricht's blog post When windows aren't the culprit of a leaky building, solve the mystery with an energy audit.
"Well said, Don! Now is the time to invest in energy efficiency to help keep homes and buildings…"
1 hour ago
Bret Curry replied to Hal Skinner's discussion An example of what an RCC can do with no R- insulation in the walls.
"Thanks for the prompt reply Hal. Do you have any third party infrared white papers (including…"
1 hour ago
Don Fitchett commented on Melissa Ulbricht's blog post When windows aren't the culprit of a leaky building, solve the mystery with an energy audit.
"Yep, winter is coming and there are not many out there trained to do IR Infrared Thermography…"
2 hours ago
William B. Ramsey commented on Chris Laumer-Giddens's blog post Mini-Split Heat Pumps are Quirky, Especially their Capacity
"Excellent post, thank you!I live in a humid climate and the mini-split heat pump I have will not…"
2 hours ago
Hal Skinner replied to Hal Skinner's discussion An example of what an RCC can do with no R- insulation in the walls.
"Good morning Bret. Solar Reflectivity -    0.83 Thermal…"
3 hours ago

© 2014   Created by Lawrence Berkeley National Laboratory.

Badges  |  Report an Issue  |  Terms of Service