Good Sam Club Open Roads Forum: digital thermostat
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swimmer_spe

Sudbury, Ontario, Canada

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Posted: 11/29/19 10:19am Link  |  Quote  |  Print  |  Notify Moderator

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.

2oldman

Ca

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Posted: 11/29/19 10:40am Link  |  Quote  |  Print  |  Notify Moderator

yes

ScottG

Bothell Wa.

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Posted: 11/29/19 11:13am Link  |  Quote  |  Print  |  Notify Moderator

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.


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BarneyS

S.E. Lower Michigan

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Posted: 11/29/19 12:01pm Link  |  Quote  |  Print  |  Notify Moderator

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. [emoticon]
Barney

* This post was edited 11/29/19 12:18pm by BarneyS *


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swimmer_spe

Sudbury, Ontario, Canada

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Posted: 11/29/19 01:52pm Link  |  Quote  |  Print  |  Notify Moderator

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.

naturist

Lynchburg, VA

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Posted: 11/29/19 02:26pm Link  |  Quote  |  Print  |  Notify Moderator

Piece of cake.





Lwiddis

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Posted: 11/29/19 02:59pm Link  |  Quote  |  Print  |  Notify Moderator

Then it will be easy to do, swimmer.


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rhagfo

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Posted: 11/29/19 03:49pm Link  |  Quote  |  Print  |  Notify Moderator

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


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opnspaces

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Posted: 11/29/19 08:16pm Link  |  Quote  |  Print  |  Notify Moderator

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.

* This post was edited 11/30/19 10:51am by opnspaces *


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Dusty R

Charlotte Michigan 48813

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Posted: 11/30/19 07:50am Link  |  Quote  |  Print  |  Notify Moderator

opnspaces wrote:

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, 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.


This is because home thermostat's operate on 24 volt AC and RV ones are 12 volt DC or battery.

Dusty

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