Replacing the Old Analog with this Honeywell

Welcome to the forums!
Click here for an easy way to post pictures on the forums. :)
Barney

Now that was easy. Thanks Barney S...

I'll give it a shot- though that one is a bit odd.
Red- not used
Yellow- Y
White -W
Blue and Brown- G
Green - R

Reasoning- the DuoTherm grounds the relays to activate, plus needs both fan wires grounded for Hi fan.

Honestly, that stat isn't much of an upgrade so it may not perform any better than what you had.

Just needed something for the summer. Having to put a whole new system in for next year. May do the Ac and Heat system.

Chris Bryant wrote:
I'll give it a shot- though that one is a bit odd.
Red- not used
Yellow- Y
White -W
Blue and Brown- G
Green - R

Reasoning- the DuoTherm grounds the relays to activate, plus needs both fan wires grounded for Hi fan.

:H

Isn't that just another analog t-stat?

I recommend you google 'wiring code for thermostat'. Lots of info.

Old-Biscuit... Yes it is another analog t-stat. The Duo Therm t-stat bit the dust and this was recommended to get me through the summer. The whole unit will be replaced this fall. I was looking for something to get me through a few more weekends. Thanks

RV Digital Thermostat Installation Guide - This is how we did ours.


.

From the way your current thermostat is wired, this is what you'll need:

Red wire from +7.5 - R on the new stat
Yellow wire from cool - Y on the new stat
White wire from furn - W on the new stat
Blue wire from hi fan - G on the new stat
(if you want to put low on there, it would be the orange wire on the G instead)
Tape off the green wire, it's not needed.

A few things to look out for when you do replace your thermostat:

Make sure to get a battery powered stat if you're using a homeowner version. They run off of 24V AC, not DC like the MH stat does. This one will work fine because it doesn't need power to work, but the nicer stats will need either batteries or 24V AC to work properly.

Also, most homeowner stats do not have a hi/lo fan switch, so that may need to be wired in to a separate switch and mounted somewhere close to the stat. If you know you're never going to use one speed or another, no need for the switch, just make sure you're putting the correct wire on the 'G' terminal.

I just purchased two of these for our MH, they're battery powered and work perfectly but do not have the hi/lo fan:

https://www.acwholesalers.com/Honeywell/TH5110D1022-1H-1C-FocusPro-Non-Programmable-Lg-Display-Thermostat/32359.ac?question=focuspro