Originally Posted by Mikegyver
To the best of my knowledge unless you are with a fire sprinkler company you cannot touch a backflow device on a fire line. I can only test irrigation and commercial (medical, foodservice, etc) backflow devices.
It probably is within local codes and depending on the region There are a huge liabilities when it comes to fire sprinkler systems. We also have our speciality back flow licenses which allow us to repair them.