Green House Woes

you can use a relay that is controlled by the second stage stat. Hook the 1st stage that you have running to the damper now through a set of normally closed contacts on the relay. Hook the fan to a set of normally open contacts. When the 2nd stage kicks in, it will activate the relay which will close the damper and start the fan. I hope this helps. If you have any further questions my email is BRM8250@gmail.com.

Thanks,

Ben

Tx Ben

I think I got it. Great stuff.

Gregg

Just lemme know how things work out. I hope i was able to help a little.

Thanks,

Ben

Hey Ben and Energygod tx for the info

I did install a relay and it works great, next problem was I was using a two stage cooling stat and never realized that the window was too short, only a few degrees before 2nd stage kicks in, so I went to two stats, one set at 65 opens the roof vents and 2nd stat set at 80 turns on fan. When fan kicks on the relay closes the roof vents. Just awsome, had so much fun with that, I installed another relay, and a shutter vent at the other end of the green house and connected it to an actuator motor and wired it into the 1st stat so when the roof vents open, it opens the shutter vent and by passes the first relay so when the fan kicks on and closes the roof vents the shutter vent stays open to supply outside air to the fan. When the fan meets its demand, it shuts off opening the roof vents again and when it goes below 65 it closes everything.

Bam works great, now I have to just wire in my solinoids and timer for the watering and I do not have to even go into the green house except to harvest. haha

tx again

Gregg

Looks like someone has truly found their "Green Acres".

Enjoy the growing season and the results.

You can also change the fan discharge so you are pushing air into the greenhouse- install a baffle twice the area of the fan at 1 fan diameter downstream- to eliminate any possibility of short circuit.