I know this is not Rachio related but there are experts here so I thought I should ask.
I moved in this house in the spring so this is my first “winterization”. The guy came with the air-compressor and blew out the system and removed the backflow device. My question is how do I drain the pipe from the supply line to the backflow device? My irrigation system supply line tee’s of the main supply from the basement and there are no “drain screws” (or similar things to drain). I can also see that before leaving the inside of the basement the pipe has a L connector and goes down 6 inches then outside of the house (where are the more pipes that I cant see beyond that). Even if there was a drain screw, it would only drain right where the pipe leaves the inside where there is a 6 inch drop as the water isn’t going to travel up to drain. Has anyone seen something like this? Can there be another way to drain this? I am afraid that the pipe from backflow until it hits the house (and is air conditioned after that) still has water in there. From what I can tell the system was installed less than 5 years ago. Let me know if anyone has any ideas.