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: 4006

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

Dan McKee posted a blog post

Innovations for Heating and Cooling

Heating and cooling of indoor spaces is one of the major operations of modern households and…See More
1 hour ago
Amber Vignieri posted a status
"In the market for a #solar home? We're bringing you improved solar #MLS listings. http://bit.ly/2auldQ8"
19 hours ago
Tom White's video was featured

CalCERTS Plenum Pressure Matching

This video describes how to perform plenum pressure matching to measure system airflow.
20 hours ago
Rob Madden, Solar Home Broker replied to Rob Madden, Solar Home Broker's discussion Indoor Air Quality Monitors and Meters
"Awesome respnose...thanks for your insight!"
yesterday
Zane Goff replied to Rob Madden, Solar Home Broker's discussion Indoor Air Quality Monitors and Meters
"We use the air advice quick test device and I'd recommend it for the depth of home…"
yesterday
Amber Vignieri posted a status
"#Solar does WHAT?! #SunShot busts myths aboutt #SolarRealEstate http://energy.gov/eere/articles/5-common-myths-about-residential-solar"
yesterday
Profile Iconnaryking, Rob Hoehn, Hannah Wood and 2 more joined Home Energy Pros
yesterday
Chris Laumer-Giddens posted a blog post

Building with Rocks, Rocks. Check out the Drying Potential

Building with Rocks, Rocks! Check out the Drying Potential.Check this out! This 24" x 48" x 2"…See More
Tuesday

© 2016   Created by Lawrence Berkeley National Laboratory.   Powered by

Badges  |  Report an Issue  |  Terms of Service