Gurgling radiators


  #1  
Old 12-18-05, 07:58 AM
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Gurgling radiators

The last couple of mornings when my gas, hot water,2 zone sytem comes on there is a gurgling sound from a bedroom radiator for about 30 secs. this radiator is at the end of one of the 2 zone loops.
After everything runs for awhile there is no more gurgling from the radiator all day long. Water pressure gauge reads where it should.
I have bleeds on all the radiators and a automatic vent valve at the expansion tank.
I guess i have air in the system and i have to chase it down,or maybe the automatic fill valve has gone west.
I need thoughts on this, and how to bleed the air out of the system.
Thanks
 
  #2  
Old 12-18-05, 11:13 AM
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Gurgling rad

Try increasing the pressure on the system to around 20#. Sometimes once you do this it will give the air the extra kick it seems to need to get out of the system. If it does not come out on it's own, try bleeding the noisy radiator. you might want to have the bleeder open & have someone else turn the thermostat up.
 
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Old 12-18-05, 12:27 PM
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Thanks Grady. Good suggestions. I'll try that out
 
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Old 12-19-05, 02:44 AM
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I raised the pressure and bled the radiators with the circulator pumps on and still have the mornng gurgling sound.
Maybe i should change the auto-vent on the x-trol expansion tank?
If i change the auto-vent valve should i shut of the cold water feed valve,
drain off some water at the boiler so the pressure drops and unsrew the vent to replace?
Thanks again
 
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Old 12-19-05, 12:16 PM
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Well, it appears i'm not the only one with this gurgling problem.
Iv'e spent the better part of this day running up the t-stats in both zones
and running around like a circus clown manually venting the radiators,and still have the gurgling noise first thing in the morning when the system calls for heat. Auto vents work in both zones,pressure is within range,all radiators are hot,no obvious leaks. I just finished manually venting both vents at the end
of each zone return( highest closes to boiler) and no joy.

Don't what else to do but call a HVAC outfit. $$$$$$

will keep you advised.
 
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Old 12-19-05, 04:50 PM
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Air & noises

Wish I had a shot at it in person. I do the best I can on the web but it's not like being there.
 
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Old 12-19-05, 07:15 PM
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Appreciate your concern. I think the only thing left might be to raise the pressure/water by the fill valve a little so as to get the air to vent. I'm thinking the water level might be low. I don't believe the systems boiler gauges.
I'll let you know how that works.
 
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Old 12-19-05, 08:13 PM
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Gurgling Sound

Gaswede:

Your getting air sucked into the piping system thru one of the fittings or auto vents, etc.

Wait until a mild day & drain the system; make up a test jig with a psi gauge & schraeder valve (auto tire valve) to pump 20 psi of air with a manual tire pump into the system & see if you can hear any air escaping from any of the fittings; if the gauge shows a loss within 15 minutes, you've got a leak somewhere in the system; use soapy water to check all fittings & bleeder valves; replace any leaking valves & fittings to prevent air from enteriing the system.
 
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Old 12-19-05, 08:14 PM
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Boiler Pressure

You can get a pretty good idea of the boiler pressure by using a low pressure tire gauge on the air valve of the expansion tank if you have a bladder type tank.
 
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Old 12-20-05, 06:27 AM
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Good Morning,

I added water to the system last night,it raise the pressure from 7 to 10 pounds, Quiet as a mouse this morning. Will continue to monitor.
 
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Old 12-20-05, 01:53 PM
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Update:

The system is still holding pressure and the water level is stable. Still no
gurgling. Probably feel the issue is solved in a couple days if everything stays as it is now. amazing what only a 2-3 lbs. of pressure can do.

I was also suspecting a leak in the system,especially in the boiler.

Thanks chimney and Grady for your help.
 
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Old 12-20-05, 06:25 PM
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daswede

Glad we were able to help. Yes it is amazing how much difference just a few psig can make. If you are running only 10# on a two story system, I suggest you get it up to around 15#. If it is two zones in a ranch or other single story home, the 10 psig is fine. Rule of thumb: 5# per floor + 3# for the boiler.
 
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Old 12-20-05, 06:31 PM
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Iv'e set it for 10#,and it is a ranch. Still holding!
Merry Christmas and a Happy New Year.
 
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Old 12-20-05, 06:42 PM
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10#

Good deal. Thank you for the well wishes.
:glocke: Merry Christmas & Happy New Year to you & yours. :gespann:
 
 

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