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: 92

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

Rob Madden, Solar Home Broker's discussion was featured

Indoor Air Quality Monitors and Meters

I'm considering purchasing the AirAdvice for Homes indoor air quality monitor but it seems to have…See More
16 minutes ago
Luis Hernandez's discussion was featured

ERV Configuration

Greetings everyone,     I did an energy audit on this new home that is too tight and needs…See More
16 minutes ago
Kim Tanner's discussion was featured
18 minutes ago
John Nicholas's discussion was featured

Slab Edge Insulation - A Side Thread to Melissa's Question

Melissa Baldridge inquired about installing slab edge insulation on a potential E-Star certified…See More
19 minutes ago
Melissa Baldridge's discussion was featured

ENERGY STAR - Slab Insulation

Folks,Let's say I have a client who's building slab on grade and intending to certify E-STAR.  I'm…See More
40 minutes ago
Sean Maxwell's discussion was featured

Blower Door Databases: ATTMA and Retrotec rCloud

Hi guys,We're pushing for blower door testing in the building code here in Australia and we think…See More
41 minutes ago
Bob Blanchette's discussion was featured

Real World Ceiling Fan CFM

Has anybody done testing on delivered CFM of ceiling fans? Energy star has a test room where the…See More
43 minutes ago
Tom White posted videos
1 hour ago

© 2016   Created by Lawrence Berkeley National Laboratory.   Powered by

Badges  |  Report an Issue  |  Terms of Service