Is there a Ghost in Boiler Number 1?

EdTheHeaterMan

There is a noise coming from a Weil McLain CGs boiler that I cant get rid of. I cant even explain where the noise is coming from! Look and listen to the video on my Facebook Page https://www.facebook.com/TheServiceDepartment.llc/?ref=tn_tnmn
if there is anyone that can help, I am all ears.

there are 2 WM CGs boilers that lead-lag Via Tekmar control. System installed 10 years ago but this is a new homeowner. I guess the previous owner just lived with the noise.
Radiant floor with injection pimping via Tekmar controls. Also has DHW tank. System works fine but air is difficult to purge after making repairs (like replacing a circulator).

STEVEusaPA

Are you sure it's not something in the impeller?

EdTheHeaterMan

I used a Stethoscope with a long rod attached to the end and listened to the boiler and piping for over an hour. The noise is defiantly loudest at the elbow and pipe nipple closest to the return opening at the boiler. The circulators are mounted on the supply. Also just replaced both boiler circulator cartridges within the past year #1 in October 2015 and #2 in March 2015. #1 ceased up and there was no hot water last March and the new owner purchased in May 2015.

I am thinking about pumping thru something to remove scale from the boiler this spring. I have never encountered this noise before. I hate to sell something to a customer that i'm not sure will fix the problem. Only guessing at this point!

bob_46

I'm thinking the internal check on the IFC pump. Try closing the ball valve on the discharge of that pump while it's making the noise and see if it changes.

unclejohn

There are two things that will make the type of sound. The blower or the pump.

EdTheHeaterMan

With no apparent reason the noise stopped. #1 boiler has been operating for 1 month with no noise.

BOB. I already did the valve open and valve closed thing on several of the valves in the system. I reduced pressure and increased pressure. Played with this thing over an hour - 1/2 trying to get something to make the noise happen and then stop by off and on of electrical components and open and close of valve. I think I'm going to suggest a scale remover and flush out both boilers on the next maintenance this fall.

Uncle John. Pump on or pump off Fan on or fan off noise does not change. gradual increase in banging then gradual decrease as the water temperature increases and decreases. noise is not from motor

Thanks for input everyone!

Robert O'Connor_12

sounds like a flow control valve. I don't see any but see that the pumps have flow checks. I'd start there.

Robert O'Connor/NJ