I was looking at the wiring of my current thermostat and I want to know why it's wired the way it is...The yellow wire was wrapped around the white terminal and the yellow terminal. And the white wire was wrapped the around the Orange terminal. The red and green wires were each wrapped around their respective terminals. And the blue wire wasn't connected to anything. Why would the electrician have wrapped the yellow wire around 2 terminals? Is that normal? Also, I tried installing a new thermostat but the heating is not working. The fan works but it just blows room temperature air. The new thermostat only had 4 terminals for R, Y, W, G. I connected the wires I had to their respective terminals. However, I think it may not be working because I have a probably have a heat pump. Any Ideas why else it might not be working? Thanks a lot!
If you have a heat pump, then the thermostat that you currently have will not work. Otherwise, green wire to G, (fan circuit) white wire to W (heat circuit) Yellow or Blue to Y (cooling circuit) but don't hook up both. Just one or the other. Finally, Red to RC/RH (24V circuit). Make sure on your furnace control board that it is wired the same as your T-stat. Good luck.
The 24 gauge cord is slightly easy. considering you will need in basic terms 2 conductors and the telephone cord is 4 conductor, basically double up the wires. Tie the two ends of two conductors collectively for each conductor mandatory.
You should take sketches of the thermostats and wires to your favorite plumbing heating store, and talk to a service person, if you feel competent enough to do the proper connections yourself. Also, include details of the thermostat wiring connections to your heating unit. Otherwise, get such a person to come over to your house to do the work.
Yeah it sounds like you have a heat pump and it is wired VERY basically. Your new thermostat will not work because it has no O terminal. You will have to buy a heat pump t-stat then wire it the same way your old one was and it should work fine. In other words Red to R and Rh if it has one, Green to G, Yellow to Y *AND* W, and White to O. Basically what's being done the way your old t-stat was wired is the compressor is being brought on in heat or cool and the white wire on O is switching your reversing valve for cooling mode. The way you have the new one wired is just going to switch the reversing valve and turn the fan on and won't bring the compressor on when the heat is called to run. If your system has backup heat, that extra blue wire could be used to bring the backup heat on if it is re-wired to do so. If your going to have it re-wired I would change the wiring so blue was the reversing valve and white was the backup heat. This would require re-wiring both indoor and outdoor units if it is a split system or re-wiring the package unit if it is that type. Or if you really want it done right have new thermostat wiring run and have it wired properly for a heat pump. If you don't want to go through all of that just buy a heat pump stat and wire it like your old stat.
