Remote sensor for thermostat - averaging?..............(Starch)

John Starcher_4

...to install a thermostat to control air conditioning for a commercial application. I would like to have a remote sensor, and install the stat in a closet.

Does anyone make a stat that can have three sensors wired to 'average' the temperature that the stat sees?

Starch

John Starcher_4

Yes.

Just talked to the Honeywell rep.

It can be done with the focus pro 8000, but needs 4 sensors to work properly.

Jack

You could use the

Braeburn 5300/5400. You can use 1, 4 or 9 sensors, not 3. I'm not sure of the electronics on this but it has to do with the power wave signal. Check them out at www.braeburnonline.com

Kal Row

as the sensors are most likely thermistors...

you can series-parallel as many of them as you like as long at the total resistance remains the same - it goes like this

1 alone
2 rows of 2 sensors in each row
3 rows of 3
4 rows of 4
5 rows of 5 "eh-tzet-te-rah..eh-tzet-te-rah.." (Yule Brenner in "the king and i")

when you put two in parallel you half the resistance so you have to double up each in series - with that method you can fill a whole house with sensors and get the avg temp - it a best input to a modern boiler controller's "room sensor" input

However don’t forget the resistance of all that connecting wire, with so many sensors it could have a effect on the temp sensed

if you really need an intelligent demand, I would go with the InnovexTechnologies iWorx, a simple 2 wire LON networked controller and temp sensors and boiler controls – and you can operate it all from the internet, and you can bias every sensor +-255, so you bias a sensor on or off completely or adjust for a bad sensor location with a small bias, for course there are the Honeywell and the tekmar tn4 systems as well – but the Innovex comes out a lot cheaper per node – I put it and new boiler into a school and they saved 18,000 on fuel last year, and with the price increase, this year was an even bigger saving – I even have their window air conditioners on the iWorx – via a lighting control module and relays that runs with both a schedule and a schedule override to off via the iWrox alarm module when the outside temp hits 65 – it’s a nice, easy, and inexpensive system to know about, as you can no longer get a non-“Green” school or municipality contract

www.InnovexTechnologies.com – a really great company to do business with – and since you can put the controller on the net with the built in Ethernet port – they can help you troubleshoot by remote control