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Open Roads Forum  >  Do It Yourself Modifications and Upgrades (DIY)

 > Therostat upgrade to digital Honeywell RTH111 /RTH221

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Katt1

Many Mansions RV Park

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Posted: 03/04/12 08:37am Link  |  Print  |  Notify Moderator

I am upgrading from existing 1992 Prowler/Regal(5th wheel)thermostat to a Honeywell model RTH111 /RTH221. I have labeled existing wiring,they are as follows.
Existing wiring

R = RH / RC jumpered
B = ? Instructions say do not hook this wire up.
Y = Y
W = W
GH = ? Fan wire I believe (heat)
GI = ? Fan wire I believe (AC)

New thermostat hook up

Y
G
RH
RC
W

How to arrange old wiring to new thermostat?

help please it's getting hot in here.
Thanks ahead of time for everyones input

Katt


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rhochnadel

Colorado

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Posted: 03/04/12 09:43am Link  |  Print  |  Notify Moderator

Normally wires are hooked up as followws: RH/RC for power source, W for heat, Y for cool, and G for fan. If you do not have any instructions with your new thermostat, start with these connectctions and test. Wish I could help you further.


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donn0128

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Posted: 03/04/12 10:02am Link  |  Print  |  Notify Moderator

Katt1 wrote:

I am upgrading from existing 1992 Prowler/Regal(5th wheel)thermostat to a Honeywell model RTH111 /RTH221. I have labeled existing wiring,they are as follows.
Existing wiring

R = RH / RC jumpered
B = ? Instructions say do not hook this wire up.
Y = Y
W = W
GH = ? Fan wire I believe (heat)Fan high speed (AC)
GI = ? Fan wire I believe (AC)Fan low speed (AC)

New thermostat hook up

Y
G
RH
RC
W

How to arrange old wiring to new thermostat?

help please it's getting hot in here.
Thanks ahead of time for everyones input

Katt

You need to buy a mini SPST switch also. Do a search for wiring schematics and instructions for wiring the T-stat using the function above and print them off. It is a simple job if you follow the instructions.

Go here for instructions.
http://www.rverscorner.com/hunterstat.htm

* This post was edited 03/04/12 11:53am by donn0128 *


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Chris Bryant

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Posted: 03/04/12 10:47am Link  |  Print  |  Notify Moderator

A lot depends on whether you are working with a Coleman or DuoTherm unit. They work differently.


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alageezer

seale, al

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Posted: 03/04/12 04:13pm Link  |  Print  |  Notify Moderator

When we installed our Honeywell thermo, we checked the difference in the fan speeds from high to low. Seeing as how there was very little difference, we just hooked the high speed up, and didn't bother with the low speed or installing a seperate switch.

No complaints so far.


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rtaylor0830

davidsonville md

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Posted: 03/04/12 10:01am Link  |  Print  |  Notify Moderator

gl is low fan gh is high fan

Wiscampsin

Wisconsin USA

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Posted: 03/04/12 07:30pm Link  |  Print  |  Notify Moderator

Chris Bryant wrote:

A lot depends on whether you are working with a Coleman or DuoTherm unit. They work differently.


I'm curious, what's the difference?


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LAdams

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Posted: 03/04/12 07:49pm Link  |  Print  |  Notify Moderator

Wiscampsin wrote:

I'm curious, what's the difference?


IIRC, Coleman switches hot leads for activation, Dometic switches ground leads for activation... Most Atwood Furnaces function by switching ground leads...

Chris will correct me if I'm wrong...

Les


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HUNTER THERMOSTAT INSTALL

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Chris Bryant

DeLand, Florida, USA

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Posted: 03/05/12 05:06am Link  |  Print  |  Notify Moderator

Les is right, plus Dometic (DuoTherm) has to have both high and low fan grounded for high fan operation.

Wiscampsin

Wisconsin USA

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Posted: 03/05/12 07:06am Link  |  Print  |  Notify Moderator

Thanks Les and Chris. Les, it was your link that I used to install my previous thermostats. We ordered a new Forest River 5er. Delivery is 6 weeks out. When I looked at one at the dealer I noticed it said 'Dometic' on the Tstat. It's digital, not programmable, but I want to install a Hunter programmable one. If it's alot different than the Coleman directions any other tips on how I would wire it?

Thanks

* This post was edited 03/05/12 10:01am by Wiscampsin *

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