My house has a RangeRelief device. It is a powered device installed at the duct over the kitchen exhaust hood that I think senses pressure or airflow. When the exhaust hood is turned on, this device senses that, and sends a signal, via low voltage wiring to a doorbell type transformer, which is wired to a powered damper, and the damper opens, letting fresh air in through a duct. When the kitchen range hood is turned off, the damper closes.
This is the device; my installation is option #2 in the diagram. Per the diagram, both the switch and the damper operate off of 24 v.
I would like to maintain this "dumb" low voltage standalone operation (so the damper will also open for a future owner when they turn the kitchen exhaust hood on, even if they don't have HE). HOWEVER, I would also like to add a z-wave or zigbee device to open and close the damper at other times.
Does anyone know if this is possible and if so how?
I would take a look at the EDIT: Zooz Zen 16 relay. Tap into the the damper (blue and red?) wires to energise the damper when the relay is energised. This way either the rangerelief device can power the damper, or the zooz relay via hubitat. I believe you could also power the Zooz device from your 24 volt AC transformer as per the specs. I'm using a USB C wall wart.
This is the same scenario as a garage door where either your door switch, or the relay can open the door. I would check voltages at the damper with the system operating (before installing the Zen17) to make sure you tap into the correct wires.
I had a quick look at the range relief web site, so yes, you'd tap into the blue and red wires at the damper, or at the range relief (blue and red) and connect them to the SW1 terminals on a Zen16
You'll want the Zen 16, not the Zen 17. Your 24 V AC transformer can also power the relay via the + - terminals on the relay so it's a plug and play solution for your application
@denwood
I've acquired the Zen16. The below is my interpretation of how you posted the Zen16 would work to control the damper in parallel with the RangeRelief. Do I have this correct?
Edited to add: The above wiring may be incorrect. The Zen16 instructions state no voltage at all can go to any of the switches, so maybe the connections going to Sw1 need to go to R1?
@calinatl ,you don't need SW1 connected to anything if you just want to maintain "dumb" automation, but also control the damper.
Your Hubitat can control the R1 relay on/off, so no input to SW1 is required. If you connect your RED and BLUE lines to R1 terminals, then you can control the damper.
Connect the 24 V AC power from the transformer to the + - terminals on the Zooz Zen16 to power it. Highly advise you check first with voltmeter before connecting to the +- to make sure it is 24V. AC or DC will work to power the Zen16.
