I am putting in a new furnace and thermostat. The connections on the furnace are C G R W1 W2. The connections for the thermostat are B O Y G W RC RH. There is a jumper wire on RC and RH. The thermostat instructions say to run the hot wire to RH and the neutral wires to W and G. I am using 3 wire and the colors are green, red and black. How do I properly wire the set up.

Is your new system heat only?

If it is just a furnace, you need to hook red to Rh either green or black to W on the thermostat, hook the same colors at the furnace, make sure you install a jumper between W1 and W2 at the furnace.

Red to RH on the thermostat and to where on furnace? Black to W on thermostat and where on furnace?

Red to R on the furnace and Black to W on the furnace, also install a jumper wire between W1 and W2 on the furnace. Make sense?

Also if you want to be able to run the fan manually, hook the green wire to "G" on the thermostat and "G" on the furnace

Ya that makes sense. If I hook the green wire to the G on both units , will I be able too opperate the fan from thermostat?

Thanks I am a little slow on the key board

No problem, post back and let me know if it works.This is an electric furnace I assume?

You bet.

If you don't mind, rate my answer if I helped you.

When I turn on the power the heat turns on , even with the temp set below room temp and the thermostat in the off position.

Sounds like you may have something crossed, What is wired where?

I have red to RH which has a jumper to RC,black to W and green to G on thermostat.I have red to R,black to W1 which has a jumper to W2 and green to G on furnace.

Remove all of the wires off the terminals on the furnace, turn the furnace on, Does it still come on?

No it does not turn on.I'll explain a little more.I had someone who helped me install the furnace and wire it by trial and erro.It seemed to run fine,started in low and then jumped up to high, turned on & off when supposed to.He had the red to W on thermo & W2 on furnace and black on RH & W1.I wanted to be able to operate fan from thermo so I hooked up green wire to G on both.Nothing happened.

Is this a 2 stage furnace? If so you are going to need a multi stage thermostat, but the way I told you to wire it with the jumper between W1 and W2 should turn it on and off. I really don't see how it would have ever ran with the way you are saying your friend had it wired. All you need is a wire suppling power from the "R" terminal on the furnace to "RH" on the thermostat, then you need a wire from "W1 and W2" to "W" on the thermostat and green to "G" on the thermostat and furnace.

This is a single phase furnace. If I disconnect the jumper between W1 & W2 the fan switch operates the fan fine.When I turn the thermo temp above room temp the fan turns on immediately on high.If I disconnect the green wire the furnace starts in low then up to medium with a pause at beginning,when thermo is turned up.