Quickest way to Field-check you Model 3 Flow Sensor!

I think the question I get asked the most is, well I dunno know, it happens a lot, enough that I would remark on it – a lot of people come up to me and they say “How do I know if my flow sensor is positioned within spec?“

My answer’s always the same, I say: “Listen. Luckily we don’t have to go all the way back to the Civil War to answer this…” ¹

The truth is, most never check, but here’s a quick easy way to ensure your Minneapolis fan’s flow sensor’s positioned properly in the field. So easy in fact that you’ll do it every time!

The spec for a Model 3 fan is between 3/16″ (4.7mm) and 5/16″ (7.9mm). See page 58 and 59 of the Operation Manual.

Lay the fan flat so flow sensor hub is up. Using the fan frame’s cross bar, use a measuring tape, simply measure the gap!

http://www.bluegreengroup.ca/site/wp-content/uploads/2013/09/P1050209-e1380550228677.jpg

Easy as pie: slap your cross bar on the back face of the fan carcass so it spans the fan housing and measure the gap. I used my grandfather’s T-square for the picture above, but you can use your measuring tape!

http://www.bluegreengroup.ca/site/wp-content/uploads/2013/09/P1050211-e1380551422921.jpg

And the reading is 2/8″ AKA 4/16″ or 1/4″! We’re in the house!

If your fan is not in spec, the fix is super easy, you’ll have to loosen a bolt and move the motor in the mounting bracket till its within. You can learn more about it in this article I wrote a while back for Homer Energy magazine called Pimp My Blower Door: A blower door make-over.

Foot note:

¹ Sorry for the cheesy homage to Tom Waits.

Views: 87

Comment

You need to be a member of Home Energy Pros to add comments!

Join Home Energy Pros

Videos

  • Add Videos
  • View All

Twitter

Latest Activity

Chris Heenan replied to Dale Hoffmeyer's discussion Friends and Family Referral Marketing
"I wish this forum had thumbs up buttons."
3 hours ago
Russ Eisenberg replied to Dale Hoffmeyer's discussion Friends and Family Referral Marketing
"I like a 2 prong approach.  Refer someone and the referrer gets $X and the referral gets $x…"
4 hours ago
Brian Toll replied to Dale Hoffmeyer's discussion Friends and Family Referral Marketing
"We get a handful of audit referrals each month by offering a $25 bounty to our customers through…"
4 hours ago
Tom White's video was featured

Hayward Healthy Home Principles and Products

Bill Hayward discusses the principles that were used to build the first Hayward Healthy Home and how the products were evaluated for toxicity before they wer...
5 hours ago
jackie harsha is now a member of Home Energy Pros
5 hours ago
Diane Chojnowski replied to Jan Green's discussion Retrofitting a 1979 Home to NAHB Silver or Gold - Pending Cert
"Jan, please post your slide deck or presentation here. We'd love to see it!"
5 hours ago
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
Sunday
Crosbey Archery liked Crosbey Archery's blog post How to improve the air quality in your home ?
Saturday

© 2016   Created by Lawrence Berkeley National Laboratory.   Powered by

Badges  |  Report an Issue  |  Terms of Service