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This post has been edited 1 times, last edit by "jonjonbear" (Dec 21st 2009, 1:08pm)
I've only installed one Add A Zone. That was many years ago and it's still working. Running a new wire for me is always a better option if possible. I did read the PDF. It does say it'll run a master valve. I can't figure out how though. You can't run two valves at the same time with the add a zone that I'm aware of. What I would do if i was you is, use the add a zone to run two sprinkler valves independently then use the extra hot wire from one of the valves to run the master valve.
http://sprinklertalk.com/manuals/add_a_zone/Add-A-Zone_manual.pdf
I've only installed one Add A Zone. That was many years ago and it's still working. Running a new wire for me is always a better option if possible. I did read the PDF. It does say it'll run a master valve. I can't figure out how though. You can't run two valves at the same time with the add a zone that I'm aware of. What I would do if i was you is, use the add a zone to run two sprinkler valves independently then use the extra hot wire from one of the valves to run the master valve.
http://sprinklertalk.com/manuals/add_a_zone/Add-A-Zone_manual.pdf