Question
Hello...we just installed an undergound sprinkler system. We are using a Rainbird Timer. Our source of water is a canal via a 1.5 hp pump which puts out around 50 psi's. We want to install a pressure switch that will shut pump off if intake or filters get clogged and the p.s.i. goes down. The problem is - even though the pump holds it's 'prime', the pipes have zero pressure and the low-pressure cut off on pressure switch won't allow pump to run. It only takes from 5 - 10 seconds for our system to get pressurized. I was told that we could bypass the pressure switch for the 5 - 10 seconds with some type of delay timer, so that pump has opportunity to run and put the water pressure well within the perimeters of the press. switch.

What type of a delay timer do we need (240v) and how do we rig it up? THNX!

Answer
Sorry for the delay of answering. I've been trying figure out how  to word this so it's understandable.
Yes you can use a time delay. It would be an off delay. I would suggest up to 3 minutes time delay. The pump will not be harmed.
Now comes the problem. How do I explain the wiring? If you can send me an e-mail to [email protected] I can send a schematic back. I'll need to know how the pump is wire 120 or 220. Also is your pump control relay at the pump or in the house? It's the small box that click when you turn the controller on.

Matt