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: 3379

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

Photos

Loading…
  • Add Photos
  • View All

Latest Activity

JC NATALE posted photos
15 hours ago
Mike Burton replied to Amos Dunham's discussion ISO blower door or other equipment
"Are you still looking?  I have rarely used Minneapolis Blower Door and Duct Blaster Systems I…"
22 hours ago
Jonny Fisher posted a discussion

Used energy equipment for sale (blower door, duct blaster

I've got some used equipment that I need to sell. Let me know if you are interested in any of the…See More
yesterday
Joe Quiroz Jr. liked Don Hynek's discussion Superinsulation retrofit is Complete!
yesterday
Mick Lane replied to Rob Buchanan's discussion High-use headscratcher
"The geothermal heat pump is the most likely culprit.  The heat pump doesn't make heat it…"
yesterday
Mick Lane is now a member of Home Energy Pros
yesterday
Empower Efficiency added 2 discussions to the group Job Board
yesterday
Tom White's video was featured

A net-zero builders formula for insulating a super energy efficient home

Here is Peter Amerongen's formula for insulating a super energy efficient home.
Friday

© 2016   Created by Lawrence Berkeley National Laboratory.   Powered by

Badges  |  Report an Issue  |  Terms of Service