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Old 08-12-2009, 02:20 PM   #1
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Upgrade RV analog with Honeywell Thermostat


I want to upgrade my analog thermostat to a Honeywell RTH230B in My travel trailer This is the wiring for the Honeywell...
RH...heating power supply
RC...cooling power supply
W....heating power supply (I assume W= white)
Y....cooling signal (I assume Y = yellow)
G...fan (I assume G = green)

This is the wiring for the Duo-Therm...
Green....GND
Blue...hi fan
Brown...fan
Red... 7.5 (I assume this is voltage)
White...heat
Yellow...cool

I don't need low fan capability. I keep mine in the auto setting.

Could you please tell me how to wire the Honeywell. I am not very keen on electrical stuff like this and would sure appreciate some help.

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Old 08-12-2009, 07:09 PM   #2
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Upgrade RV analog with Honeywell Thermostat


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Originally Posted by Ray Wallace View Post
I want to upgrade my analog thermostat to a Honeywell RTH230B in My travel trailer This is the wiring for the Honeywell...
RH...heating power supply
RC...cooling power supply
W....heating power supply (I assume W= white)
Y....cooling signal (I assume Y = yellow)
G...fan (I assume G = green)

This is the wiring for the Duo-Therm...
Green....GND
Blue...hi fan
Brown...fan
Red... 7.5 (I assume this is voltage)
White...heat
Yellow...cool

I don't need low fan capability. I keep mine in the auto setting.

Could you please tell me how to wire the Honeywell. I am not very keen on electrical stuff like this and would sure appreciate some help.

I'll take a stab at it

Jump RH/RC and pur the red wire there
White wire to W
Yellow wire to Y
Blue wire to G


Tape off green and brown wire.

Again I am guessing here. Never worked on a travel trailer

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Last edited by Plumber101; 08-12-2009 at 08:15 PM.
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Old 08-12-2009, 08:12 PM   #3
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Upgrade RV analog with Honeywell Thermostat


plumbers got it.....only thing i will add is see if the subbase on the new stat calls for a C wire connection.that would be the other side of the transformer within the furnace,the newer electronic stats need a solid 24Vs constant at the subbase to support the board on the stat(if you see no C your good to go just check the fan cycle thru the heat call so you know its there come FALL
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Old 08-13-2009, 12:34 PM   #4
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Upgrade RV analog with Honeywell Thermostat


Appreciate the help. I will try installing it tomorrow and let you know how it works.

I don't understand this comment...".only thing i will add is see if the subbase on the new stat calls for a C wire connection.that would be the other side of the transformer within the furnace,the newer electronic stats need a solid 24Vs constant at the subbase to support the board on the stat(if you see no C your good to go"

The Honeywell board is power by two aa batteries. I don't see a C anywhere on the thermostat.

Again thanks a million for you kind help.
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