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Author Topic: Duo Therm wiring for new digital thermostat  (Read 727 times)

dezbull

  • Posts: 1
Duo Therm wiring for new digital thermostat
« on: December 06, 2017, 10:20:39 PM »
I am wanting to upgrade this Duo Therm rsv420k62 thermostat to a digital Honeywell RTH8580WF.

The basic thermostat color codes pic may define all of my wires in the Duo Therm pic except for the black wire labeled as H.

I came across the manual for this thermostat, and I believe the H black wire is for high fan or is it?

The RH and W are for the furnace.

How do I hook all of my wires to a Honeywell RTH8580WF thermostat?
« Last Edit: December 07, 2017, 08:33:09 PM by dezbull »

Isaac-1

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  • Posts: 1008
Re: Duo Therm wiring for new digital thermostat
« Reply #1 on: December 07, 2017, 04:16:34 AM »
Don't expect the Duo-Therm to use conventional wire color codes, I wish I could help more, I upgraded my DuoTherm analog thermostat to a modern Honeywell battery powered unit last year.  Unfortunately yours appears to be even older than my old DuoTherm analog and may use different voltages.  As I recall mine used a 7.5V electrical system, not 24V like traditional home units.

p.s. the extra wire may be the hi/low fan speed control
« Last Edit: December 07, 2017, 04:29:13 AM by Isaac-1 »
2002 Safari Trek 2830

Super8mm

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  • Posts: 113
Re: Duo Therm wiring for new digital thermostat
« Reply #2 on: December 28, 2017, 03:55:31 PM »
I am wanting to upgrade this Duo Therm rsv420k62 thermostat to a digital Honeywell RTH8580WF.
The basic thermostat color codes pic may define all of my wires in the Duo Therm pic except for the black wire labeled as H.
I came across the manual for this thermostat, and I believe the H black wire is for high fan or is it?
The RH and W are for the furnace.
How do I hook all of my wires to a Honeywell RTH8580WF thermostat?

See if  this might help?
http://www.atwoodmobile.com/manuals/furnaces/MPD%2032046%20E%2011.27.06.pdf
1997 Foretravel 36' U270
2011 LML Duramax/Allison 4x4
2013 Palomino Puma 356-QLB