On Sat, 29 Jun 2013 04:11:37 +0000 (UTC), "Danny D."
wrote:

On Fri, 28 Jun 2013 13:56:58 -0700, Oren wrote:

Is the pump only for the irrigation lines?

Nope. There are two systems, separated by a huge backflow preventer
valve which pops up out of the ground in a reverse-U shape.

The first branch of well water feeds the irrigation and fire suppression
system; and then the second branch feeds the house.

Your system is unique.

I suspect you want to keep high pressure on the line for fire
suppression. Adjust the irrigation lines at the valve control box.