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: 3831

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

Jan Green posted a discussion

Retrofitting a 1979 Home to NAHB Silver or Gold - Pending Cert

I'm excited to be the lone speaker for the last in a series of lectures for the Scottsdale Green…See More
3 hours ago
Crosbey Archery liked Crosbey Archery's blog post How to improve the air quality in your home ?
yesterday
Crosbey Archery replied to Don Hynek's discussion Testing "Magic Pak" units?? in the group Multifamily Buildings
"second-floor (and higher) units without humping a ladder all the way around the building is a very…"
yesterday
Colin Genge posted events
Friday
Profile IconJon Turnbaugh, Lights N More and John Kamas joined Home Energy Pros
Friday
Amber Vignieri posted a blog post

Relay Network Targets Multifamily Housing Upgrades Nationwide

Affordable apartment buildings are home to more than 10 million American households, making them a…See More
Friday
Tom White's video was featured

Robby Schwarz on Builder Collaboration

Hear Robby Schwarz, of EnergyLogic discuss the value Owens Corning brings to Thrive Home Builders.
Friday
Crosbey Archery liked Don Hynek's discussion Testing "Magic Pak" units??
Friday

© 2016   Created by Lawrence Berkeley National Laboratory.   Powered by

Badges  |  Report an Issue  |  Terms of Service