Tray Biasiolli
  • Charlottesville, VA
  • United States
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Tray Biasiolli's Discussions

Two-stage furnace, control at furnace or thermostat?

Started this discussion. Last reply by Rob Jan 23. 11 Replies

Got called in recently to address thermostat and comfort issues for a local builder we work with. In reconfiguring the thermostat (…Continue

 

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Rob replied to Tray Biasiolli's discussion Two-stage furnace, control at furnace or thermostat?
"I installed/configured a couple Honeywell VisionPro 8k models recently in a commercial facility. It has governing ability for 4 stages of heat and 2 of cool. It triggers out from 1st stage when sensing 90% capacity of the furnace.  "
Jan 23
Mick Lane replied to Tray Biasiolli's discussion Two-stage furnace, control at furnace or thermostat?
"I was playing with a 2 stage carrier furnace last week.  The staging is not bad on the condensing boilers.  They camp out at low fire until the return air temp drops or they get past 5 minutes of run time.  I am fine with them doing…"
Jan 23
John Proctor replied to Tray Biasiolli's discussion Two-stage furnace, control at furnace or thermostat?
"Ted -- The startup losses on modern furnaces are much smaller than the old days. I would suggest a modification to your statement to: "if the ducts are normal and in unconditioned space then the losses exceed the gains from long run…"
Jan 22
Robert Zockoff liked Tray Biasiolli's discussion Two-stage furnace, control at furnace or thermostat?
Jan 18
tedkidd replied to Tray Biasiolli's discussion Two-stage furnace, control at furnace or thermostat?
"We use reverse staging on ecobee. Generally, the best comfort, energy savings, iaq, etc are achieved by doing what you can to avoid having the equipment ever shut off. We suspect among other things, start/stop losses are significant. If the…"
Jan 11
Tray Biasiolli replied to Tray Biasiolli's discussion Two-stage furnace, control at furnace or thermostat?
"Thanks, John. The HVAC installers have actually responded to incentives and moved ducts within the building envelope on the vast majority of the furnaces we see, so losses to unconditioned space are less of a concern for us. Thanks for bringing up…"
Jan 5
David Butler replied to Tray Biasiolli's discussion Two-stage furnace, control at furnace or thermostat?
"@Tray, the staging logic is described on pg 85 of the furnace installation manual. In particular, here's what it says: "This furnace can operate as a two--stage furnace with a single-stage thermostat because the furnace control CPU…"
Jan 5
Eric Kjelshus replied to Tray Biasiolli's discussion Two-stage furnace, control at furnace or thermostat?
"Set up for 1st stage to run at highest eff.   With my set up will run on 1st stage 93% of time.   Use a high end flue gas meter and set up for max eff.   "
Jan 5
Tray Biasiolli replied to Tray Biasiolli's discussion Two-stage furnace, control at furnace or thermostat?
"Thanks for the quick feedback, David. I did find the furnace install manual earlier; there's no detail (that I was able to find) on staging logic or adjusting staging timing. Glad to understand the typical thermostat staging in a bit more…"
Jan 4
John Proctor replied to Tray Biasiolli's discussion Two-stage furnace, control at furnace or thermostat?
"I hate to be the one to bring this up, but two stage furnaces are quite capable of having lower installed efficiency than single stage furnaces with the same max input. This comes from two sources: 1) the fuel air mixture on low fire often has too…"
Jan 4
Kent Browning replied to Tray Biasiolli's discussion Two-stage furnace, control at furnace or thermostat?
"David's comment is spot on. I would always prefer thermostat staging control over furnace staging control. (I am assuming the thermostat is making and breaking the control call for heating - not communicating the temperature back to the furnace…"
Jan 4
Diane Chojnowski left a comment for Tray Biasiolli
"Hi Tray, Welcome to Home Energy Pros Forum. Feel free to join the conversation in the Forum and Groups. And share your energy efficiency photos, videos and upcoming events. If you're blogging about home performance, this is the place for…"
Jan 4
David Butler replied to Tray Biasiolli's discussion Two-stage furnace, control at furnace or thermostat?
"I'm not sure about the Ecobee Smart Si (I couldn't immediately find the install manual) but this FAQ (http://bit.ly/2Cf2UsR) describes Ecobee's staging logic -- it's selectable based on either elapsed time or temperature…"
Jan 2
Tray Biasiolli posted a discussion

Two-stage furnace, control at furnace or thermostat?

Got called in recently to address thermostat and comfort issues for a local builder we work with. In reconfiguring the thermostat (Ecobee Smart Si), I noticed that it was wired up as a single stage for heating, although the furnace (Carrier 59TP6) is a two-stage model - that is, furnace staging decisions…See More
Jan 2
Tray Biasiolli is now a member of Home Energy Pros Forum
Jan 2

Profile Information

Company
Think Little
Role in Home Performance Marketplace
Building energy modeler, Energy auditor / assessor / analyst
Professional Certification
BPI, HERS Rater
Website URL
http://www.think-little.com

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At 8:56am on January 4, 2018, Diane Chojnowski said…

Hi Tray,

Welcome to Home Energy Pros Forum. Feel free to join the conversation in the Forum and Groups. And share your energy efficiency photos, videos and upcoming events. If you're blogging about home performance, this is the place for you!

Don't forget to upload your profile photo.

Thanks!
Diane, HEP Forum Moderator

 
 
 

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