distance between outdoor sensor and concentric vent?

Plumbob

I finally looked at the outdoor part of our new Munchkin installation. The temp sensor is 10" (center to center) from, and almost directly above, the concentric vent. From the top of the vent to the bottom of the sensor is about 7".

Now I don't know whether to make an issue of this with the contractor. On the one hand, heat rises and so the exhaust should affect the reading. On the other hand, the intake is right behind the exhaust, much closer than the temp sensor...

There is nothing in the Vision I manual about this, so I can't refer him to the rule book (so to speak). All advice is appreciated---what is usual and customary?

Mike T., Swampeast MO

The ideal location is on the North side well above the snow line. On a two-three story house, put about mid way up the 2nd floor (North side of course). That's where I've had the sensor for my outside thermometer for years and it's highly accurate.

Due to distance limitations, the ideal may not always be possible. The West is probably the worst unless you can place the sensor where it will be shaded the vast majority of the time. My current outdoor reset (mechanical) sensor is on the West side, shaded by the electric meter base. It seems reasonably accurate, but I suspect it thinks the outside temp is a bit warmer than actual for about an hour in the late afternoon.

S Ebels

I don't have much doubt

That location will affect the accuracy of the sensor. When the burner/draft inducer idles down there is not much velocity in the exhaust gas stream. I'd move it.