On May 7, 2:13*pm, "pipedown" wrote:
"I would gladly follow the wire...if I could. *The best that I can
determine, somebody was drunk as a skunk when they laid out this
system. *The systems overlap and the control valves are as far from
their systems as possible. *It is the craziest thing I have seen."

Sounds like under a New York City Street.

Personally I prefer a system where all the control valves are in one or two
locations near the main water source then run underground heads as needed
with no valves. *i.e Point of Source switching. *Point of Use switching whre
the valve is near the zone to be served has the problem that it is hard to
clear the line ahead of the valves for winter or if there is a leak.

For leaks, just cap off all the heads and turn on the water, the leak should
surface under pressure if you are lucky.

I designed and installed the system at my prior residence. Did just
what you suggested and had all of the control valves in one spot
directly where the water connection was. Only had to run about 15 of
wire from the timer. All systems ran out from that central point
which was in the middle of the overall system. Never had a problem
with any of the system in almost 20 years of use which is more than I
can say for most of the professional installed systems. But what the
heck do I know, I was just another dumb homeowner.