Munchkin 140M operation noise

DaveGateway

I had an old hot-water(about 70 years old)cast iron oil-fired boiler replaced last year with a Munchkin 140M. The contractor used all copper pipe to connect to the Munchkin, replacing the old black-iron pipe. The remaining pipe that connects to all of the cast-iron radiators is still the original black-iron pipe. The circulator was replaced with a TACO model 0011. When the system calls for heat, I hear a slight humming sound coming from the radiators. I have a old 2-story cape-cod and seems loudest in the master bedroom radiator on the second floor. I thought it might be a bad bearing in the circulator but this humming noise is not present at the boiler or circulator. Its loudest at the radiators and seems loudest when the system first calls for heat then the sound volume of the hum drops as the water heats (presumably). The contractor thinks that some of the radiator shut-off valves might need to be replaced.
Any thoughts?

Guy_5

noise

I think that you are right in assuming that the noise stems from vibration. Water (filled pipes) are an excellent transmitter of sound. The phenomena of why noise is always greater in the bedroom is a reality that defies explanation.
My thoughts run toward how the iron size piping was supported while the copper was attached. If there is a slight looseness in a hanger, any vibration that exists will becime evident. As the system heats, the pipes move and snug up, therefore quieting the noise.

Mark Hunt

Taco 0011


That pump is probably way oversized for the system. What you hear is the water running through the radiators.

The 140m needs the equivilent of a Taco 0010 across the heat exchanger, but your system probably needs no more than a 007.

Can you post some pictures?

Mark H

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kk_2

Maybe you're moving a whole lot more water through the system than you were before, which is causing an increase in noise?

What was the previous circulator in the system?

munchkin-man

noise in your pipe's

Sounds like the circulator is sending the noise through the piping. How many zones is there I assume it is one zone. Do you have primary secondary piping? If not that would be added cause for the noise. Try installing a primary loop with an 0010 and use an 007 on the secondary or a by pass between the supply and return ends, this will divert some of the water back through the boiler this may kill some of the sound. The best way is to do primary secondary piping. Some pictures would be helpfull on determining the cause.