ERV croaked – Part 2

In winter time, our ERV makes a big difference with its heat transfer – given that it is running.

And it has been running for a couple of weeks after we got it repaired. Right into November. But suddenly the ERV started to blow cold air into the garden apartment! No more heat transfer! Running the ERV or opening windows had the same effect. Cold fresh air. Yikes!

What was going on?

I opened up the ERV and noticed right away that the enthalpy wheel was not turning. The filter pies in the enthalpy wheel are responsible for the heat transfer. No turning wheel, no heat transfer.

ERV-05 ERV-06

I was back on the phone with the UltimateAir tech support. They suspected that the motor turning the enthalpy wheel gave out, or that the circuit board that controls that motor stopped functioning.

We went back into troubleshooting mode. I called Percy, our electrician, who arrived with his multimeter. We checked the voltage at the critical points of the circuit board. No voltage!

UltimateAir put a new board in the mail right away, and included a new motor too, just in case.
I installed the new board – et voilà, the enthalpy wheel was turning again. Because I didn’t need the new motor, I put it back in the mail to UltimateAir.

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About Marcus de la fleur

Marcus and his wife Cathy purchased a 100+ year old masonry two-flat in the City of Chicago to start a new pilot project – a deep energy retrofit. He is a Registered Landscape Architect with a horticultural degree from the School of Horticulture at the Royal Botanic Gardens, Kew, and a Masters in Landscape Architecture from the University of Sheffield, UK. Marcus developed his first landscape based sustainable pilot project at 168 Elm Ave. in 2002, and has also worked on a number of LEED certified projects. In that process he expanded his expertise from landscape architecture to building science, which continues to grow and which he applies to his own home.

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