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: 70

Comment

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

Join Home Energy Pros

Home Energy Pros

Home Energy Pros was founded by the developers of Home Energy Saver Pro (sponsored by the U.S. Department of Energy,) and brought to you in partnership with Home Energy magazine.

Latest Activity

Tom Conlon commented on Kurt Shafer's blog post What is your opinion about members promoting products here?
"I just checked the site Guidelines Kurt, and any true "promotions" should be posted in…"
15 hours ago
Tom Conlon posted a discussion

Whole House Fans - Love 'Em or Not?

I just searched this forum for "Whole House Fan", but I didn't find much about them (except …See More
16 hours ago
Richard Beyer replied to Mike Kandel's discussion Our Homes Suck – And That's Why Our Kids Have Sinus Problems
"Don, Thank you for the praise! I only wish that some of these profiteers could answer my questions…"
18 hours ago
Richard Beyer replied to Mike Kandel's discussion Our Homes Suck – And That's Why Our Kids Have Sinus Problems
"Todd, This report (attached link) below on poor people living in subsidized housing show's…"
19 hours ago
Mike Kandel added 4 discussions to the group Building Performance Institute (BPI)
20 hours ago
Mike Kandel posted discussions
20 hours ago
Nate Adams commented on Jim Gunshinan's blog post My Energy Upgrade California—The Numbers Are In
"Jim, Glad to help! OK, a touch of soap box. So long as we don't tell people EE is free and…"
21 hours ago
Kurt Shafer commented on Kurt Shafer's blog post What is your opinion about members promoting products here?
"Bob, Good idea. I see that you are a window energy reduction expert. You might consider adding…"
22 hours ago
Robert (Bob) Bacon commented on Kurt Shafer's blog post What is your opinion about members promoting products here?
"Kurt, I would explain what energy/efficiency problem this device solves and explain the science the…"
22 hours ago
Ben Jacobs replied to Mike Kandel's discussion Our Homes Suck – And That's Why Our Kids Have Sinus Problems
"I agree that in many homes the indoor air sucks.  However, a lot of this problem is caused…"
yesterday
Kurt Shafer commented on Kurt Shafer's blog post What is your opinion about members promoting products here?
"Tom, thank you for your odd reference to a leaky duck. It is a bit off topic since I was not asking…"
yesterday
Tom Delconte commented on Kurt Shafer's blog post What is your opinion about members promoting products here?
"Shameless self promotion here sucks like a leaky duck!"
yesterday

© 2014   Created by Lawrence Berkeley National Laboratory.

Badges  |  Report an Issue  |  Terms of Service