| Location for Honeywell outdoor temperature sensor Hello folks,
I got a new HVAC system installed and along with it a nice Honeywell VisionPro 8000 thermostat. This thermostat has the option to install a remote temperature sensor. I pulled new thermostat wire for this for the new system, however the older wire is still in the wall abandoned. I was toying around with the idea of using the old wire and connecting it to the S1 and S2 terminals and enabling outdoor temperature sensor in the installer menu.
I could pull the cable up to the attic and install the sensor in a gable vent. However I'm wondering if additional airflow through the gable vents would make the reading off in the summer. I realize the attic can get very hot in the summer... however I would likely try to position the sensor in the louvers on the outside portion of the gable vent screen.
Do you think this is an OK place for the temperature sensor?
My other option is extending the already run cable down and out through the garage trying to push and squeeze the wiring through an existing grommet where cable TV wiring comes in. I can do this as well but it just involves extending the wire.
Here's the sensor I'm thinking of purchasing:
»www.pexsupply.com/Honeywell-C708···955000-p
Here's the thermostat capable of integrating with it.
»yourhome.honeywell.com/home/prod···8000.htm
Is this something I need? No... but it's a fun project that adds a little neat factor of seeing the outdoor temperature in the lower right corner of the thermostat screen. I may or may not do it. |
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 nunyaWho is John Galt?Premium,MVM
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O Fallon, MO
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| The attic gable would be a terrible location. In or out.
It should be 4-6 feet above the ground and out of direct sunlight. Normally, they are on a standoff to keep them away from the building surface (radiant and reflected energy). Stay away from bathroom, furnace, and dryer exhaust vents. Stay away from the A/C condenser.
Typical direction is the north side of a building.
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 SandSharkLong may you runPremium,MVM
join:2000-05-23
Santa Fe, TX
kudos:3 | reply to cypherstream
I don't know, but one of these seems like a lot less hassle if you just want to know the outdoor temperature. Plus, you don't have to get up and go to the thermostat.
»www.lacrossetechnology.com/9245/index.php |
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 tschmidtPremium,MVM
join:2000-11-12
Milford, NH
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| reply to cypherstream
To expand on nunya  here is an app note about optimum temperature placement.
»www.davisnet.com/product_documen···noaa.pdf
I have a home weather station and have the temp season on the north side of our deck mounted on a wood post protected by a radiation shield.
The trick it to keep it out of the sun and away from surfaces heated by the sun and as much as possible in free air so it measures air temp.
/tom |
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| reply to SandShark
Yeah I was thinking the attic gable might not be the best location. I was just up there and it does feel cool, but hey it's November. I bet the heat from the attic might radiate to the sensor in the summer even if its on the outside portion of the screen.
If I extend the wire and run it downstairs and out the garage through an existing gromet where CATV runs, that would be 4-6 feet above ground, out of direct sunlight on the south west side of the building.
SandShark, you make an excellent point. Also we have iphones and an iPad, plus the DirecTV weather app on our TV set to our zip code. There's a lot of ways to get outside temperature. Like I said, I may not even do this... it's just an interesting project I thought I'd tackle for fun. We'll see what kind of time I have and if I'm looking for a small project for my amusement. |
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| reply to cypherstream
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 Jack_in_VAPremium
join:2007-11-26
Mathews, VA
kudos:1
1 edit | reply to cypherstream
I am the NOAA Coperative Observer Network (COOP) for my county. Here is the digital temperature sensor they installed for the official high/low readings. As you can see it's right in the middle of the yard and exposed to full sun away from any obstructions.
I also helped install a station at the local Coast Guard Station and it's set up and placed exactly the same. |
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| Jack, is that solar powered with RF communication back to a receiver, or did you have to bury a cable back to a computer or base station?
Pretty cool looking! |
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Jack_in_VAPremium
join:2007-11-26
Mathews, VA
kudos:1 | said by cypherstream:Jack, is that solar powered with RF communication back to a receiver, or did you have to bury a cable back to a computer or base station?
Pretty cool looking!
It's hardwired with a special cable looks like RTD shielded cable. |
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| reply to nunya
said by nunya:The attic gable would be a terrible location. In or out.
It should be 4-6 feet above the ground and out of direct sunlight. Normally, they are on a standoff to keep them away from the building surface (radiant and reflected energy). Stay away from bathroom, furnace, and dryer exhaust vents. Stay away from the A/C condenser.
Typical direction is the north side of a building.
+100
..... make sure it is always shaded .... you want it to only read air temperature.... Consider sun angles summer & winter when coosing the installation location. |
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Parneli
join:2004-12-28
Naperville, IL Reviews:
·VOIPo
| reply to SandShark
Depending on the OP's HVAC setup, the outdoor temp on the Honeywell IAQ thermostat is to a)help modulate the gas valve and b)adjust humidifier settings. |
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 Bink63Namedrop THISPremium
join:2002-10-06
Everywhere | reply to cypherstream
I think the best place for an Outdoor Temperature Sensor is outdoors. |
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 MrMoodyFree range slavePremium
join:2002-09-03
Smithfield, NC | reply to Parneli
said by Parneli:Depending on the OP's HVAC setup, the outdoor temp on the Honeywell IAQ thermostat is to a)help modulate the gas valve and b)adjust humidifier settings.
If he has a heat pump, it can also lock out the compressor or auxiliary depending on temperature. That's how mine is set up.
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"When all you have in the country is people pulling coffees, flipping burgers and manufacturing financial scams, your nation is doomed."-Karl Denninger,market-ticker.org |
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Jack_in_VAPremium
join:2007-11-26
Mathews, VA
kudos:1 | reply to MaynardKrebs
said by MaynardKrebs:+100
..... make sure it is always shaded .... you want it to only read air temperature.... Consider sun angles summer & winter when coosing the installation location.
»Re: Location for Honeywell outdoor temperature sensor
Really? Then the NOAA installers that put my instruments in were wrong? They installed the thermometer in the middle of the yard in direct sunlight See link above for pictures of their installation. |
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id09542
join:2002-04-25
Bloomington, IL | I understand what you are saying, but remove the enclosed white cover and see if it works the same? The sensor for the thermostat is just a rubber coated "stick", I hang mine next to the AC cutoff switch outside --- in the shade. If I hung it against my house on the sun facing side, the temps would be very extreme when the sun was shining. The sensor is not to just report the outside temp, it is utilized by the thermostat for humidification reasons to keep from having the windows having condensation on them. |
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tschmidtPremium,MVM
join:2000-11-12
Milford, NH
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| reply to Jack_in_VA
said by Jack_in_VA:I am the NOAA Coperative Observer Network (COOP) for my county. As you can see it's right in the middle of the yard and exposed to full sun away from any obstructions. Neat setup. I should have been clearer in my post that one either 1) needs to keep the sensor out of the sun, or 2) use a radiation shield.
Is that a passive shield or is there a ventilation fan. I though about getting a ventilated shield but it was too expensive for what I wanted to do.
/tom |
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Jack_in_VAPremium
join:2007-11-26
Mathews, VA
kudos:1 | reply to id09542
said by id09542: The sensor is not to just report the outside temp, it is utilized by the thermostat for humidification reasons to keep from having the windows having condensation on them.
This is interesting. I'd like more details so that I can utilize the outside temperature to control the inside humidity in my house. Would you mind providing this information? I'm sure others here are interested also. |
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Jack_in_VAPremium
join:2007-11-26
Mathews, VA
kudos:1 | reply to tschmidt
said by tschmidt:Neat setup. I should have been clearer in my post that one either 1) needs to keep the sensor out of the sun, or 2) use a radiation shield.
Is that a passive shield or is there a ventilation fan. I though about getting a ventilated shield but it was too expensive for what I wanted to do.
/tom
Tom my instrument is passive. The only connection is the cable for the temperature sensor. |
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Parneli
join:2004-12-28
Naperville, IL Reviews:
·VOIPo
| reply to Jack_in_VA
said by Jack_in_VA:said by id09542: The sensor is not to just report the outside temp, it is utilized by the thermostat for humidification reasons to keep from having the windows having condensation on them.
This is interesting. I'd like more details so that I can utilize the outside temperature to control the inside humidity in my house. Would you mind providing this information? I'm sure others here are interested also. He didn't say that he was using "the outside temperature to control the inside humidity in [his] house".
What he did say is both correct and true.
From the Honeywell IAQ thermostat manual:
Control Humidification Level
The VisionPRO® IAQ Touchscreen Thermostat reads the
inside humidity level and allows for a humidification setting with
or without frost protection.
WITH FROST PROTECTION
Controlling humidification with frost protection requires an
outdoor temperature sensor. The Frost Index (scale 1–10) will
limit the amount of humidity added to the air based on outdoor
temperature, with 1=most dry and 10=most humid. This
prevents frost from accumulating on windows.
Heck even my old circa 1970 Aprilaire furnace humidifier even had a knob that you would adjust based on the outside temperature. |
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Reviews:
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| reply to cypherstream
The manual of the sensor suggests placing it on the siding or under the gutters.
Keep in mind this isn't a precision sensor for a weather station, it is an "informational" sensor of lesser accuracy.
»s3.pexsupply.com/manuals/1277918···FILE.pdf |
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