View Full Version : Newbie hydronic questions!
03-26-2009, 07:03 AM
I've just bought an older house with hydronic baseboard heating. The boiler is only a few years old.
1 - Is it normal for the circulating pump to run all the time, even when heat is not needed?
2 - Is it normal to be able to hear the pump running ( the sound seems to be conducted through the pipes)?
3 - One room's heater doesn't give off any heat. Its valve seems to be open. I've been told to drain it to remove air bubbles - how is this done?
03-26-2009, 08:30 AM
You need a mechanic that is highly skilled in boilers to be maintaining this system. That is the only advice I can safely offer.
03-26-2009, 09:54 AM
you can remove air, if that's the case, by opening the air vent located near the topof the radiator, you may need an odd square wrench to open it.
Open the valve, and have a rag ready, keep it open a s long as you hear the air escape-a few seconds, maybe more.
as soon as water comes out, turnit off and hope you caught it w the rag.
03-26-2009, 12:52 PM
03-26-2009, 04:42 PM
No, the circulator should only run on a call for heat. No the circulator should not be very loud. probably has a bad coupling, bearing assembly or motor mounts. And removing the air may have to be done at the boiler, from the purge & balance valve.
03-26-2009, 04:47 PM
#1. Depends. Some systems are set up for constant circulation, but you could have a failed relay or some other problem in the controls which has left the pump constantly running. More information required.
#2. No. Pump could be shot or original installation and vibration isolation could be poor. Noise is subjective and one persons quite could be anothers noisy. System could have been set up noisy from day one if the original owner/installer did not care.
#3. Bleed the air out. If that does not work then there is something thing else wrong, and you will have to provide more information about your piping arrangements for this forum to help troubleshoot.
03-31-2009, 06:37 AM
Ahhhhhh... Our friend air... Pump should NEVER be wired to run constantly. (unless you own a pump factory?)
06-03-2009, 09:06 AM
Circulators should never run all the time, there is no need. Sounds like a bad relay or a bad install.
You will hear sound depending on the location of the pump to where you are hearing it. Check to see how well your piping is secured, you maybe able to tighten them up a bit.
Get the air out... annoying problem but a simple solution.