I bought and installed a Scala2 pump to help with my low pressure due to elevation. My incoming pressure is 30psi. When I set the pump any higher than 40psi it thumps when it kicks on and then runs erratically, changing rpms sometimes stopping for a split second, which results in another thump when it starts up.
I finally got around to trouble shooting it today. It appears that inlet check valve is allowing enough flow backward to pressurize the line between the pump and the check valve where it comes into the house (about 15' of 3/4 cpvc). When there is a call for water the pump starts and the check valve slams open causing the thump. The intake pressure jumps around quite a bit during this and I think it confuses the pumps controller and it runs erratically trying to maintain a constant output.
I'm waiting on the RMA to go through to refund/replace, the pump. My biggest question is this something that a functioning inlet check will fix or is it likely a design flaw and should I just get a refund and get a different pump.
I finally got around to trouble shooting it today. It appears that inlet check valve is allowing enough flow backward to pressurize the line between the pump and the check valve where it comes into the house (about 15' of 3/4 cpvc). When there is a call for water the pump starts and the check valve slams open causing the thump. The intake pressure jumps around quite a bit during this and I think it confuses the pumps controller and it runs erratically trying to maintain a constant output.
I'm waiting on the RMA to go through to refund/replace, the pump. My biggest question is this something that a functioning inlet check will fix or is it likely a design flaw and should I just get a refund and get a different pump.