HVAC interfacing

[darryl]

Hey all,

I'm gettin ready to put my first order into hobby boards!

I know that x10 etc can interface with HVAC thermostats, however, i was wondering if there were any 1-wire methods?

I know there is a kit at hobby boards to monitor the hvac system, but how about driving it?


TIA!

 

[Spanky]

Aprilaire, HAI, and RCS are widely used. Each one may have one or more of the following interfaces : RS-232, RS-485, Zwave, or X10.

Never seen a 1 wire Thermostat.


Careful!!!

 

[pete]

depends on what type of system you have . . . most HVAC control is 24vac and controlled via relays . . . but most fans/pumps need more than the 3amp rating of the hobby-boards 4 Channel Relay module . . . you could you this module to drive higher rated relays to switch the fans/pumps in your set-up though . . .

. . . but this leaves you no 'easy control point' other than via the computer . . .

Pete C

I love my country, but fear my government.

 

[darryl]

The HAI omnistat rc-122 two stage programmable thermostat looks like the way to go. Its not 1-wire but does program over a rs-232 port and can interface with misterhouse (i think).

After googling around I found some documentation on building your own, but that's perhaps a little risky...