If you’re interested in a for real way of integrating an HVAC system pressure alert/trigger into SmartThings, this is for you.
I came up with this idea a few weeks ago, after being unable to make any factual use of Keens built in pressure sensors while developing the Keenect vent control smartApp.
You can build this bad boy for $50 bucks.
What you need:
–an adjustable HVAC differential (dual ported) pressure switch, such as:
–an ST compatible contact sensor with internal aux trigger contacts, such as:
–Some pressure probes (the LEFOO unit comes with them, and some hose), or you can get the real deal units like these (you’ll need two)
OK, now what…
- Connect the pressure switches NO contacts to the contact sensor aux contact inputs.
- Install the probes in your HVAC ductwork.
- Connect the probes to the sensor with some bits of hose, (+ sensor port goes in the main supply plenum, just after the furnace, the - port goes into the return plenum between the furnace and the return air filter.
- Set the pressure setting, and you’re done.
This will be the supported pressure management system in the next version of Keenect, the vent control smartApp.