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Thermostat Question To0w1r3d 05-31-2006
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Posted by on May 31, 2006, 10:06 pm
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.


Posted by RBM on May 31, 2006, 10:21 pm
Terminals RH and W are for heating and not used for air only. The four wire
system should work fine with that stat, but it sounds like doesn't have two
stage capability, so it's the wrong stat for the other unit



> 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.
>



Posted by on May 31, 2006, 10:41 pm

RBM (remove this) wrote:
> Terminals RH and W are for heating and not used for air only. The four wire
> system should work fine with that stat, but it sounds like doesn't have two
> stage capability, so it's the wrong stat for the other unit
>

Four wire originally wired - RH, W, Y & G and I matched it on the
honeywell (RH/RC had a jumper)
Five wire - RH, W, Y, G & C - matched it on the honeywill except I
moved C to RC on the honeywell (removing the RH/RC jumper)

So the totaline is the wrong one for my system? It's a single unit -
how can I tell?

TIA.


Posted by Tony Hwang on June 1, 2006, 12:23 am
To0w1r3d@gmail.com wrote:
> RBM (remove this) wrote:
>
>>Terminals RH and W are for heating and not used for air only. The four wire
>>system should work fine with that stat, but it sounds like doesn't have two
>>stage capability, so it's the wrong stat for the other unit
>>
>
>
> Four wire originally wired - RH, W, Y & G and I matched it on the
> honeywell (RH/RC had a jumper)
> Five wire - RH, W, Y, G & C - matched it on the honeywill except I
> moved C to RC on the honeywell (removing the RH/RC jumper)
>
> So the totaline is the wrong one for my system? It's a single unit -
> how can I tell?
>
> TIA.
>
Hi,
Read the spec sheet of the 'stat you picked up. IMO, Honeywell VisionPro
8000 will be good choice for you. I have two which I like. One at home,
one at my daughter's condo.

Posted by RBM on June 1, 2006, 7:09 am
If all the listed terminals had wires on them, it would appear that this
unit does heat as well, correct? It has one transformer that powers both
heat and cool, hence the rh-rc jumpers. I'm not seeing two stages though.
The five wire, you need the rh-rc jumper reinstalled, but may not need the
"c" for the new stat


>
> RBM (remove this) wrote:
>> Terminals RH and W are for heating and not used for air only. The four
>> wire
>> system should work fine with that stat, but it sounds like doesn't have
>> two
>> stage capability, so it's the wrong stat for the other unit
>>
>
> Four wire originally wired - RH, W, Y & G and I matched it on the
> honeywell (RH/RC had a jumper)
> Five wire - RH, W, Y, G & C - matched it on the honeywill except I
> moved C to RC on the honeywell (removing the RH/RC jumper)
>
> So the totaline is the wrong one for my system? It's a single unit -
> how can I tell?
>
> TIA.
>



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