Discuss Upgrade From Honneywell to Ecobee Smart Thermostat Premium in the Electrical Forum area at ElectriciansForums.net

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Hello everyone. Budding DIY enthusiast fascinated with how things work - and, to a lesser degree, fixing things that are not working. I suppose my newfound interest in DIY coincided with becoming a first-time homeowner.

One of my first projects was replacing our new home's existing Honneywell TH8320U1008 thermostat with an Ecobee Smart Thermostat Premium. After I removed the Honneywell from the wall, I took a picture of the wiring diagram. Regrettably, I do not see an option to post that picture, but I will do my best to describe it as follows:

Red wire ---------> R terminal
* There was a jumper wire connected between Rc and R terminal
White wire -------> W terminal
Green wire -------> G terminal
Blue wire ---------> C terminal
Orange wire ------> E terminal
Brown wire -------> W2 terminal

Admittedly, I am still a little perplexed by the HVAC system. In the garage, I located a semi-ancient, 2005 American Standard/Trane air handler (TWE-P, something ish). The air handler was installed with downflow moving down, in the direction of the gigantic "crawl space" - all the labeling is upside down. The access panel is uncovered and accessible, but the immediate area before and after is wrapped in duct wrap insulation. I opened the door and headed into the single story "crawl space" to inspect. There is a dizzying series of similarly duct wrapped duct-work going every which way. I did not locate a furnace, however, there is a seriously wrapped, cylinder-shaped item in the middle of the jumble.

We do not have an AC unit nor heat pump, as evidence by no outside condensers or units. I should point out that I have yet to venture into the attic though I am itching to, especially since there is a large, wrapped "duct" heading out from the air handler into the attic.

Determined, I removed the Honneywell wiring harness and installed the Ecobee. For the wiring, I did the following:

Red wire --------> Rc terminal
White wire ------> W1 terminal
Brown wire ------> W2 terminal
Green wire ------> G terminal
Blue wire --------> C terminal
* orange wire not connected

After some initial disagreements with the Ecobee unit, we reached an uneasy alliance and things are working okayish.

Recently, I developed an itch that I cannot successfully scratch. I do not enjoy asking for help, or, admitting that I am stumped. However, after hours and hours of research and reading, I cannot figure out three things:

(1) Why was the Honneywell wired as indicated above? I came close to matching that wiring, but it was not quite the same;
(2) Where the hell is the furnace?!; and
(3) Is the Ecobee thermostat wired correctly?

As far as I could glean no one in their right mind - even up here in Washington State - would have an HVAC system consisting of only an air handler. If that is true, and I pray it is, is the furnace that large, wrapped cylinder-shaped shape at the center of the duct-work in the "crawl space", or it up in the attic? I have doubts that it is in the "crawl space" since there is no break in the insulation wrap and no access to any panels.

I really appreciate any advice/answers anyone is willing and able to provide. Apologies for the lengthy post. I tried to be as specific as possible.

Thank you.
 

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