I recently bought a home which has a rainbird RC-1260Bi automatic sprinkler system. I know the system works because when I did the walk through everything was fine with the system. The bad thing is, I didn't bother to learn how the system works. I have a manual now and everything seems to be in order except......I don't know how to turn the water on to the system. Is there a value I need to look for? I did find what looks to be a off/on valve in the front yard. Also close by was what looks like ...