http://www.kodinfo.com/mith/tstat2

Other terminals

http://www.kodinfo.com/mith/tstat3

Whole tstat

http://www.kodinfo.com/mith/tstat2.jpg

Other side

http://www.kodinfo.com/mith/tstat3.jpg

Whole thing

And yeah you are right, it is some gummy adhesive leftover residue, if I scratch the wire with my fingernail, it comes clean.

Quote:

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Originally Posted by KeepItSimpleStupid

You said gas, so it should not have O or B terminals.

R -
W - Heat
Y - Cool
G - Fan

Mark the tstat wires, take them off completely, and make the connections with power off and try the following:


R to G; Only the fan should come on
R to Y; Only the outside unit should come on
R to W; the fan and heater should come on

(C) if present, is optional (tape up)

The terminals should not be burnt. If it passes the above tests, then the tstat is bad.

DO you have any additional terminals besides R,G,Y,W, optional C.

R can be R&Rc or Rc/Rh

If you haven't figured it out, R (Red), W (White), Y (Yellow), G (Green)

C - often blue

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Done exactly as you posted, everything came on properly, and normally, so now I just need to replace the tstat?

Does it matter what kind of tstat I buy?

No. It looks like you have a common wire the so you can install just about any kind you like.

I fixed the above post, so it makes sense.

Furnace Filters, Air Conditioner Filters, Air Quality - iaqsource has a nicely arranged website.

You need a thermostat that will support a 1 stage heat/1 stage cool conventional system. Some stats are configurable, some are not.

Honeywell's Focus Pro series is "homeowner friendly"
The "Vision Pro" has lots of options and is contractor friendly.

Stay away from the Hunter brand.

I'd take a look at some of the instructions to figure out which might be best.

Now is the time to get a programmable stat. One option that I find that I'm using a lot is the override for a certain length of time and, of course, programmability. My system "burps" in the winter just to get the temperature up, so it's easier to get out of bed.

You want a stat that uses batteries for backup purposes only.

White Rodgers and Honeywell are solid brands.

The only issue you should run into is the addition of Rc/Rh. More than 1 stage stats can usually be reduced to 1 by programming.