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Posted by Tony Hwang on May 31, 2006, 10:44 pm
To0w1r3d@gmail.com wrote:
> Just bought a home with a bonus room upstairs - split unit AC.
> Thermostat on the first floor was a 2 stage totaline P474-0100 and
> upstairs was a single stage manual robertshaw CM200.
>
> I bought two Honeywell 5-2 Day Programmable Thermostat's to replace
> both. Replacing the bonus room went well. When I replaced the
> totaline the unit would not engage (nor the fan). All contacts were
> solid
>
> The bonus room was a four wire (no Rc, just Rh). The first floor had a
> five wire and the totaline marked it "C" - matching it up to Rc on the
> honeywell (I also removed the Rh/Rc jumper). Everything appeared to be
> wired up correctly.
>
> First - the Honeywell YRTH230B1009 stated - "For single stage heating
> and cooling or millivolt systems" - so from what I read I took a step
> back from the 2 stage totaline moving to the single stage honeywell.
>
> Second - was there a reason why there was a 4wire single stage in the
> bonus room vs the 5 wire 2 stage on the first floor - would it cause
> the problems when I installed the second honeywell?
>
> TIA.
>
Hi,
Honeywell 'stat model no.? You may have picekd up wrong one for 2 state.
Any how, I like 7 day programmer which gives more flexiility.
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