Irrigation pump relay
I am about to get an sprinkler system installed. The pump will be down at the lake, connected to an existing 240V circuit that was run by the previous owner. The breaker is a two pole 20A. I will need to install a 24V pump relay, but the ones I have found at the improvement store are 15A. I have a few questions
1) On my previous house, I had a well and the pump had a Franklin control box. Is that also normal on shallow water pumps? I have never seen them on pool pumps, so I assume it is something specific of well pumps.
2) Many moons ago, in my previous life, on the other side of the east pond I would have installed a relay with thermal protection built it. They were called contactors and where not expensive. What is considered a normal setup for a shallow water 2-3HP pump ?
3) Would it be acceptable by code to install a 15A (Rainbird) relay fed by a 20A breaker? I have been told that the 3HP pump (still wandering why a 2HP will not cut it, but that is another story) would be 240V/15A.
Any comments will be appreciated.