i bought a programmable thermostat, and the wiring i see doesn't make any sense. it's for central air, heating and cooling. there are no tags or labels on the wires, and it was probably installed in the seventies.there are four wires coming out of the wall, and they're screwed into four of six slots:Y = blue wireG = red wireW = green wireR = white wireB = emptyO = emptythe new thermostat has the following slots: G, Rc, Rh, Y/O, W/B, Y1. how should the old labels correspond to the new ones?
Here is the schematic you will need. First off I will explain what each terminal is for. Y is for cooling. G is for fan operation. W is for heating operation. R is for your 24 volt transformer. A typical wiring color is as follows. R= red wire. G= green wire. Y=yellow. W=white. B and O are for a heat pump. Do not use them. Now what you will have to do is make sure the wires at the furnace are set the way described above. Make sure if you have to switch wires around on the furnace that the power is off. You WILL blow the low voltage fuse on the control board. If your furnace has a C terminal that is the COMMON That is used to power your thermostat. (so you don't have to use batteries). You will need a 5th wire for that. For the life of me I cant figure out why they did not put the proper color wires on the right terminals. It's a supper easy thing to change. Just remember to turn off the power before removing any wires. If you use this diagram, then it will be simple for anyone else to work on the system . I hope this helps. If you need any further information feel free to let me know and I will do my best to answer your questions. Good luck.
two wires go to the cooling and two to the heat . Rc is for red wire cooling , Rh is for red heating , i would think the white goes to the W/B ,i would guess the blue wire goes to Y . but you can call the 800 number for tech help
First of all from what you are saying on how the old thermostat is wired,your furnace is wired up wrong...On the old thermostat the red wire should go to R... The white wire should go to W... The green wire should go to G... And the blue wire should go to Y... On the new thermostat the red wire should go to Rc and a jumper wire from Rc to Rh... The white wire goes to W/B... The green wire goes to G... and the blue wire goes to Y1... But if your sure that your old thermostat was wired the way you say it was then the red wire goes to G...the white wire goes to Rc with a jumper wire to Rh... the green wire goes to W/B... and the blue wire goes to Y1...
