Thermostat S1 & S2 leads

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  #1  
Old 10-28-07, 04:31 PM
L
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Thermostat S1 & S2 leads

Trying to get some details on the S1 & S2 leads on a
thermostat I am replacing.

Unit is a Bryant Heat Pump with what appears to
be a Totaline Signature P374 thermostat. I couldnt
find an installation manual to look for more detail
just the user guide.

S1 & S2 were new to me but I realize they are for
an outside temp sensor. The S1 & S2 leads do attach
to the thermostat and run outside to the unit. I checked
them with an ohmmeter to make sure that there was
actually something attached and there is. My question
is, does this external sensor do anything in relation to
the operation of the heat pump or is it just there in case
your thermostat can display outside temperatures. Thats
the odd thing.. this thermostat does not display outside
temps, but sure has an input for the sensor. I didnt want
to just replace it and not use those leads if they were
of some 'functional' value. Seems that the average
thermostat does not have these leads, just the high
end ones.


Thanks...
Les F
 
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Old 10-28-07, 05:16 PM
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I am going to need more numbers after the P374-xxxxx.

I just pulled one out of the hat, and just says reading out door temps.

I know on the Honeywell line t-stat, they use the outdoor sensor for their heat pump lock out.

I'll wait till you post back rest of your model #.
 
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Old 10-28-07, 06:06 PM
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More details

Okay...

This is about the best I can do right now as I am not
home. It is a very simple model. Looks to be a
P374- (could be 000,0100, 0200 or 0300)
Users guide for it was found here. Its a VERY
BASIC basic thermostat which surprised me when I found
the S1/S2 leads on it. Hope this helps
http://www.xpedio.carrier.com/idc/gr...7-980350-6.pdf
 
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Old 10-28-07, 06:24 PM
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I think the sensor is for nothing.. but I'll wait till you post your model #.
 
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Old 10-28-07, 07:04 PM
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p274-0300

My bad... its a p274-0300. Looks like you are right.
I found users manual online... Hit the up / down temp
buttons at same time to display outside temp.
Doesn't seem to actually be used for any kind of lockout
from what I can see. That was my main concern
 
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Old 10-28-07, 07:42 PM
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What do you have for back up heat on your system?

If you want to control when to and not to use the heat pump, I'd look into the Honeywell VisionPro t-stat.
 
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Old 10-29-07, 08:58 AM
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backup heat

Other than emergency heat on the heat pump. Nothing
extra. Yeah I was looking at the Vision Pro which looks
pretty interesting. Thought it may be overkill as I don't need
all the programming that it offers. Was leaning towards
the Honeywell Focus PRO TH5000 series as I am looking
for just simple control. (In the case of my Totaline
I am only replacing it as it has become unreliable.... It
switches modes on its own... It will jump out of heat mode
and into cool for no reason).
 
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Old 10-29-07, 09:11 AM
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The FocusPro are good t-stat as well, just won't have the "Lock out"/outdoor sensor.

I'd go with a non-programble mode, set it and forget it.
 
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