I took on a town home complex last year. 36 zones, approx 15-20 heads on a zone. PGP's almost all nozzled at 6.The system has many problems it is about 10 years old now. The last problem to happen was the booster pump failed, and it needs to be replaced this year. The senerio of the dog house is. no pump was orginaly installed when the system was installed. The main line is 55psi with a 2" line. The 2" line goes into a 1.5" water meter. The 1.5" water meter goes into a 2" rpz Then takes a 90 degree turn reduced down to 1.5" into the pump. (flint and walling 2hp 2 stage centrifical 120volt) The pump discharge is 1.25" then back into a 2" main line. There are some 90 degree elbows in there. The problem is the pump didnt want to start even though the relay was engaged and then other times it started without a problem. I figure the starter kicked in and out and finnaly became so weak that it failed. When the pump ran it was very HOT to the touch, I havent had pumps that seemed to run that hot. The reason I say it didnt have a booster pump is because the orginal hight of the 2" water line and the 2" irrigation main line are the same height and it looks as if the pump was an after thought due to all the odd fittings to make the pump work/fit into the confined area. I contacted flint and walling and they thought the pump was haveing a tough time opperating, was because the surge of water that took place in that split second from when a valve opened to when the pump turned on was making the pump work hard. Not only that but since the systems zones seem to big for the amount of water supplied there wasnt enough back force. Their suggestion was to route the water around the pump. Meaning from the rpz go directly to the irrigation mainline, with a check valve in that line. but before the check valve put a tee in line and run that to the pump, then the pump discarge would tee after the other side of the check valve. Then when the pump turned on it would build enough pressure to close the check valve and the water would flow from the rpz to the pump to the system. The pump would also run on 220v I know the system has many many problems but this hoa only wants to see water comming out of the sprinklers. I try in vain to have them remodel or very least have the zones re nozzled and they say no. I want to replace the pump with another f/w 3hp 3 stage. However, I am open to suggestions. I only want to do this one time I know it was a long read and may not make sense so I will try to answer the ??ns However, please offer some solid advice.