Greetings everyone, 

    I was wondering if anyone could help me with this error, TREAT is saying that the primary heating system capacity adjusted by distribution and heating safety factor exceeds its assigned share of building load by more than 50%.

   The heating information came from the energy audit, so I am not sure how I can correct this error. Any help will be greatly appreciated, 

   Luis

Tags: factor, heating, safety, treat

Views: 166

Replies to This Discussion

Luis, Good Evening, John of NY Construction Pros here.

I don't think you need to worry about this warning from TREAT too much.  All it means (as I understand it) is that the primary heating appliance is too large in its Btu capacity for the house.  I get this warning often.  We ignore it.  If you receive the other warning; that the capacity is TOO SMALL, this matters but if it is to big, it doesn't matter.  Check with PSD Consulting for the definitive answer but I say, don't worry.  I hope this helps.

John WL, Yorktown heights NY.

It is very common to find equipment grossly oversized. I mean 1.5 - 2x Manual J and 2-3x the size the house needs. 

It's our experience that TREAT load calc is very close to Manual J - which tends to oversize equipment by 15-40% depending upon how well you intend to fix the home.

(Just one of many examples - I have a client with a 6500 sf 1920's brick mansion that the load calc is 140,000 btu, and the house carries 70° to 5° f outdoor with roughly 60,000 btu. We can prove this through Ecobee logging: http://bit.ly/4ecobeethermostats - And this house still has leakage in excess of 5000cfm50.)

We have realized tremendous comfort and energy savings from aggressively downsizing. Our process is to downsize equipment until we get an undersized warning, then we know we are in the ballpark. If you don't get an undersized warning you are probably too big.

We don't have outdoor ductwork in our area. I would be very careful doing this with outdoor duct unless you are sealing and insulating on levels similar to these guys: http://bit.ly/ring4club

RSS

Discussion Forum

Basic Heat loss information

Started by Luis Hernandez. Last reply by tedkidd Oct 30, 2014. 1 Reply

How to model a skylight

Started by Luis Hernandez. Last reply by Luis Hernandez Oct 16, 2014. 2 Replies

Modeling the apartment upstairs

Started by Luis Hernandez. Last reply by Ethan MacCormick Sep 26, 2014. 2 Replies

Modeling a Townhouse

Started by Luis Hernandez. Last reply by Luis Hernandez Jul 7, 2013. 4 Replies

Modeling attics slopes for foam.

Started by Paul Lasicki. Last reply by tedkidd Aug 23, 2012. 4 Replies

Improvement Question

Started by Paul Lasicki. Last reply by randy tolowski Mar 21, 2012. 5 Replies

line volt(age) thermostats

Started by Jan E. Graveamker. Last reply by Amber Harris Feb 27, 2012. 1 Reply

Treat descriptions

Started by Paul Lasicki. Last reply by Amber Harris Feb 27, 2012. 1 Reply

Truing up

Started by Paul Lasicki. Last reply by Paul Lasicki Feb 16, 2012. 4 Replies

Latest Activity

David Butler replied to Don Fugler's discussion Depressurization/make-up air issues in the group Kitchen Ventilation
"Thanks for your thoughtful reply, Brennan. My point about the load impact on tight homes with…"
2 hours ago
Brennan Less replied to Don Fugler's discussion Depressurization/make-up air issues in the group Kitchen Ventilation
"David, I know the pressure reaches static levels quickly. I meant, how quickly then does radon…"
5 hours ago
David Butler replied to Don Fugler's discussion Depressurization/make-up air issues in the group Kitchen Ventilation
"@Brennan, there's virtually no lag. When an exhaust fan comes on, the pressure differential…"
7 hours ago
David Butler joined Don Fugler's group
Thumbnail

Kitchen Ventilation

In many homes, cooking is the largest indoor source of air pollutants. Exposures can be higher in…See More
7 hours ago
Tom Phillips replied to Don Fugler's discussion Depressurization/make-up air issues in the group Kitchen Ventilation
"Hi Don:  good questions, as usual. Would be great to routinely get depressurization data…"
10 hours ago
Glen Gallo replied to Rob Madden's discussion Determining Duct Leakage based solely on blower door and pressure pan testing
"delta q works cool graph does return a supply leakage sometimes it has a hard time reaching smooth…"
10 hours ago
Tom Phillips liked Don Fugler's discussion Depressurization/make-up air issues
11 hours ago
Brennan Less replied to Don Fugler's discussion Depressurization/make-up air issues in the group Kitchen Ventilation
"Hi Don, great sequence of questions, and a couple of thoughts. Overall, I just don't see…"
12 hours ago

© 2019   Created by Home Performance Coalition (HPC)   Powered by

Badges  |  Report an Issue  |  Terms of Service