Thermostat replacement - Fiberglass RV


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Old 09-03-2018, 10:25 AM   #1
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Name: Bob
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Thumbs down Thermostat replacement

I have a 1994 Bigfoot 17' Gaucho trailer with the original thermostat for the heater and would like to switch out that thermostat for a digital thermostat. Most thermostat wiring I've worked with in the past consists of several thin wires that attach to color coded terminals. The existing wiring in the Bigfoot consists of 2 fairly thick red wires. Can anyone tell me where to connect those two wires to the new thermostat?
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Old 09-03-2018, 10:55 AM   #2
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I installed a Honeywell digital thermostat and there was a piece like that red wire. Its purpose was to connect those two contacts for my type of application.

The black and white wires from the furnace also have to be connected to the thermostat.

You should find installation instructions with the thermostat you purchase.
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Old 09-03-2018, 11:29 AM   #3
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Thanks for the input. There is already a furnace installed and there are only two red wires attached to the existing manual thermostat works well which leads me to believe that those are the only wires that actually need to be connected to the thermostat.

I am hopeful that connecting those two red wires to some combination of the "C", "W", "Y", "G", "B", or "O" terminals on the new thermostat will lead to similar function. I just have no idea which of those six terminals might work.
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Old 09-03-2018, 11:32 AM   #4
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You need to read the instructions for the new thermostat. It tells you what to connect to what.
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Old 09-03-2018, 11:43 AM   #5
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The new thermostat has minimal instructions; basically just a diagram with the following labels -

"C" = 24-v operation
"W" = heat relay
"Y" = cool relay
"G" = fan relay
"B" & "O" = changeover valve
"RC" & "RH" = power supply

The existing manual thermostat is connected to two red wires coming out of the wall of the trailer behind the thermostat. The existing furnace (no AC) works fine with just those two wires connected to it.
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Old 09-03-2018, 11:57 AM   #6
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Had a look at my instruction manual and it say to label the wires before removing them from the old thermostat. To my recollection, I used that jumper ( the red wire you have shown ) between the contacts.

Then I connected the thin wires from the furnace to the same points as on the old one. I don't have any air or heat strips, so mine was just a simple swap.


Go here:
https://www.wikihow.com/Install-a-Digital-Thermostat
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Old 09-06-2018, 08:54 AM   #7
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If I read the web site correctly:
T21STK-2_SASWELL


You have a thermostat designed for home use. It requires 20VAC to 30VAC. You probably can't use this in your trailer.
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Old 09-06-2018, 08:59 AM   #8
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Trailer: 2008 Casita 17 SD
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Quote:
Originally Posted by bobblangley View Post
The new thermostat has minimal instructions; basically just a diagram with the following labels -

"C" = 24-v operation
"W" = heat relay
"Y" = cool relay
"G" = fan relay
"B" & "O" = changeover valve
"RC" & "RH" = power supply

The existing manual thermostat is connected to two red wires coming out of the wall of the trailer behind the thermostat. The existing furnace (no AC) works fine with just those two wires connected to it.

You need a 12 VDC T-stat. A 24 VDC one won't work for your trailer.

EDIT: Sorry, didn't read Dave's post before I replied. His basically says the same thing...
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Old 09-06-2018, 09:24 PM   #9
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Does the new thermostat have a battery to power the display?
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Old 09-06-2018, 09:38 PM   #10
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Name: Steve
Trailer: Scamp 13
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My white rodgers thermostat,
jumpers short red wire rh to rc.

Control leads from heater, white wire on rc with the red jumper and the other control lead red wire from heater on w

My lcd display power comes from 2 AAA batteries.
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Old 09-06-2018, 09:38 PM   #11
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Powered by a battery.
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