Do I wire my thermostat correctly? (Weathertron bay28x139 Honeywell rth7500)? Today, the thermostat (or bay28x139 bay28x141) died at home, I'm renting a room in. I just put a new thermostat, a Honeywell rth7500. Bay stat, the color of the wiring was as follows r-red, blue for T, O orange, green G, yellow to Y, X2 brown, black B and white W. I wired Honeywell corresponding to the colors in the book as follows:
Bridge between RC and R-Red wire
O/B- Orange wire
Y-yellow wire
Wireless G-Green
C-black wire
The Blue-Wireless
Wireless E-Brown
For the white wire
Nowhere in the manual does it say anything about "t". I'm not journyman HVAC, and do not know what the heck to do about it. We also replaced the fuses on the outside by the unit. Thus, a / c still not working. Any suggestions on what I could do to solve this problem? Thank you!
T is common.
What you should look
O / B - orange (make sure you set the thermostat to energize the reverse cooling or W)
Y - Yellow
G - Green
C - BLUE
L - is a terminal diagnosis with the sophisticated equipment used for relaying a fault with themostat equipment, do not bother with that, if the old themostat had not that your hardware is not smart enough to do that
E - White
For - both black and brown
Your old thermostat had the heat emergency because if the heat pump fails, and two stages of the auxiliary heat, which was the B and X2. Your new thermostat is also the heat emergency, but only one stage of auxiliary heat, thats why the two go together son there. White, black and brown all seprately a strip of thermal control of all three are interchangeable, buts its hard to say for sure without looking inside your heat bands. But it should work.
Do this with the power turned off the air handling, touch blue and red together, or burn the transformer or fuse in front of the transformer. If you can not turn the fan manually from the same thermsstat how its wired now that I can tell you that you already fried one of the two, I hope there is a fuse there, not all have them.
Posted on June 8, 2010.