digital thermostat

[swimmer_spe]

I have a 20 year old trailer that has an old manual thermostat for the furnace. Can I just switch it out for a digital thermostat? I know I need to make sure it'll work with the number of wires currently at it.

[opnspaces]

If it only controls the heater then you probably have only two wires to deal with. There is no high or low fan to worry about.

Make sure the thermostat you buy can use batteries like two AA or something.
Once you purchase your new thermostat pull the old one off the wall and count the wires. If there are only two wires this will work for you.

• Disconnect the two wires from the old T-Stat
• Drill the mounting holes for the new T-Stat
• On your new T-Stat the RC and RH wires will probably have a small jumper wire connecting them together
• Leave jumper alone and add one of the wires from your RV to either the RC or RH, It doesn't matter which wire just pick one
• Hook the other wire from the RV to the W terminal on the new T-Stat
• Mount T-Stat on the wall, put batteries in and test it.

It really is that simple. It will probably take you more time to drill the two holes and hang it on the wall than it takes to wire it up.

Edit: just realized I didn't specify where to actually hook the first wire. It should go to either the RH or RC terminal and also keep the jumper in place.

[rhagfo]

You will love the conversion as your temps will be more even.

[Lwiddis]

Then it will be easy to do, swimmer.

[naturist]

Piece of cake.

[swimmer_spe]

ScottG wrote:
Yes, it's pretty straight forward but does that stat also control the AC?
If so you will lose the two speed fan function and will need to add a simple switch to get it back. Or just wire it so the fan is always on high speed.

You will like the new stat. They keep the temps much closer to the set-point than the old ones ever did.

Mine only controls the furnace.

[BarneyS]

Yes, it has been done by many of our members. See this post, with pictures to guide you, from our Do It Yourself Forum archives .
Honeywell digital thermostat conversion
Even if yours is not a Honeywell, most of the stats available, Hunter, Lux, Honeywell, etc all wire up pretty much the same way.
Hope this helps you out. 🙂
Barney

[ScottG]

Yes, it's pretty straight forward but does that stat also control the AC?
If so you will lose the two speed fan function and will need to add a simple switch to get it back. Or just wire it so the fan is always on high speed.

You will like the new stat. They keep the temps much closer to the set-point than the old ones ever did.

[2oldman]

yes