Location of Expansion Tank

hvacfreak

It seems to me that the new boiler heats water much faster than the old one could ever hope to. You have an old piping system that has no provisions for expansion ( piping ) , at least at the rate that the new boiler is providing.And if that's not the case , I'll bet that the customers piping isn't isolated from the structure at all points either.

Primary / secondary piping of the boiler would give you some different control options and may slow the heating of the original piping by default. If thats not an option perhaps lowering the boiler setpoint may help.

edit : I am assuming that the circulator is the same or equil to what was there. Flow rate could aggravate this as well.

LT

Pinging Noises in Pipes

I've got a customer, who I installed a new Slant Fin Boiler last winter, and who is now complaining about pinging noises coming from the pipes of his hot water heating system.

I went over to listen and sure enough the pinging noises begin after the boiler and pump come on after a few minutes on inital start up or after the boiler shuts off and the pump continues to run.

The pump is on the supply side, and I left the pump to run continously. That seemed to help a little but not completely.

I realize there is some thermal expansion occuring in the piping but what can I do to mitigate the noise?

Erich_3

Pictures

Can you post some pictures?

Erich_3

Pictures

Can you post some pictures?

LT

I knew you would ask. I don't right now but I'll go back later this week and take a photo or two.

But in the meantime, as I said the pump is on the supply and the expansion tank and water feed/backflow are on the return. I suspected initally that might be the problem (i.e., location of the expansion tank) but at the same time the PSI is holding at 15PSI. The system is a simple two pipe (supply and return) and all black iron piping.

I thought it might be air in the system but the customer has bled the rads with no more air in the system. We even closed the the valve to the water feed and the pressure is/stays consistent. I even thought about closing the by-pass but thought otherwise.

The other thing is this customer is a Millwright, and he's done so repiping in the house. He's even gone through a few joists to keep the pipes about the ceiling. That is where I suspect the noise is coming from. However, he contends he did not have this same pinging noise or any before with his old Oil Boiler with the same piping layout.

Hmmm. Makes me wonder.

hot_rod

yeah

my guess would be thermal expansion also. Pipes fit, or clamped too tightly will cause that. Maybe put it on an outdoor reset control to minimize expansion and temperature swings.

hr