Slab sensors

Lynne

Where would it go, in the sunny side of the slab, or in the non sunny part.

Lynne

Slab Sensors

Do you guys use slab sensors on overpours, 1st floor, all one zone, south facing glass? Or simply a thermostat? If you use a sensor, where would you put it, and what does it do that air sensing thermostat doesn't. Thanks

Ron Huber

slab sensor

Tekmar 512 thermostat, measures air and slab temps. You can set a min. and max. slab temperature. That south facing room can heat up from the sun durring the day, allowing the slab to cool off, when the sun goes down it can take a while before it gets back up to temperature. This thermostat will keep the slab comfortably warm in these conditions without overheating the room. In wood floor applications you can set a max temp to protect the wood floor from potential overheating damage.

hr

A dual stat

with air/slab sensing ability would be a good idea on a slab install with lots of solar gain. I agree with Ron, that new tekmar 510 would be an excellent choice, lots of adjustment and programs loaded on it. www.tekmarcontrols.com

I highly recommend putting the sensor in a "well" or condiut for removal if or when it fails someday :0

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Ron Huber

sensor

The non sunny spot. The area with sun will warm up on its' own, you want to make sure the back shaded areas keep warm as well.

hr

Depending on end result desired

I would put the sensor in the sunny spot with a not to exceed temperature set. Consider this "setpoint" would turn off the heat source but keep the pump running if their is still a heat call at the wall stat location, for that zone. This could move the solar gain to the parts of the zone that are not seeing the passive solar gain.

Better yet install two sensor wells, one in the sunny spot and a second in a spot that never see the sun. This would let you experiment a little to get optimum results. That tekmar will accept two sensors, and the two stage model could probably be configured to handle this logic with some thought put into it. Maybe

I'll bet it could be done with a solar differental control also. One sensor in the sunny spot, the second in the shadey spot. The pump would control based on the delta T between the two points.

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