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Posted by Bud on August 1, 2005, 10:36 am
John wrote:
>
>
>>
>>>I have a dual transformer system - one for heat, one for cool. The
>>>thermostat I'm replacing has an Rc and an Rh connection. The new
>>>thermostat has a single R connection. The transformers are in phase
>>>with each other, however, the heat one puts out 24vac, while the
>>>cooling one is at 26.7vac. Can I connect them both to the R connector
>>>on the new thermostat, or will that not work?
>>>
>>>Thanks
>>>
>>>John
>>
>>Wrong thermostat sub-base.
>>It will not work, altho, you COULD make it work as you have now, with more
>>re-wiring that is needed.
>>
>>Get a thermostat with the proper sub-base. Honeywell for example is
>>including the RC and RH terminals on almost every one they offer in the new
>>Vision line, with a jumper that you remove to allow for the sep systems to
>>work properly.
>>Robershaw also does this, and depending on the needs and wants of you, in
>>what you want out of your stat, Robertshaw may be the way to go....its
>>cheaper, altho normally you cant buy them over the counter.
>>
>
>
> Thanks for the information.
>
> Here's what I'm trying to do: I'm replacing a White-Rodgers thermostat
> with a wireless one from Carrier. We recently had AC retrofitted to
> our house. The house is a small two story cape, and because of the
> size and space constraints, the AC is a single zone. The thermostat is
> on the ground floor, and my wife, who is handicapped, would like to be
> able to adjust the temperature while upstairs. It's very difficult for
> her to make the trip down the stairs too many times.
>
> If need to re-wire, I will - what would have to be down? Is it a
> matter of installing a single transformer with enough power to run
> both circuits? Alternatively, do you know of a different wireless
> system or other setup that would fit our needs.
>
> Thanks again.
>
> John
>
If wired right using a single R base should work. It is actually a code
violation since you are combining 2 limited power sources which could
produce a source that exceeds the maximum. (Because it is a limited
power source you can use small thermostat cable instead of #14 Romex,
for example. The whole system could probably be wired to run off of one
transformer. Or the heating side could be connected to the sub-base and
relay could be used to separate the cooling side; this is pretty easy to do.
Bud--
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