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Old 12-22-2010, 06:41 PM   #1
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help with boiler pressure/leak


just been helping a neighbor with the boiler. they complained of a lack of hot domestic water. the mixing valve was set to pretty cold. i turned it to "warmer," and now that issue is fixed.

however, there is a 3/4" line coming over the top of the boiler and running down to the bottom. i believe this is a "pressure relief/drain line"?

this has a pretty copious drip. i thought maybe the pressure was too high (right around 20) so i was trying to lower the pressure with the auto regulator. the t hing that has a lever that w hen lifted brings in more water. it also has a screw on the top. i can't quite figure out which way to turn that screw to lower the pressure! does loosening the screw result in a drop of pressure, or is it the other way around?

i got all mixed up and couldn't keep track, and it seemed like every time the boiler fired it would just raise the pressure.

so:
1) why is that line dripping?
2) how can i lower the pressure?
3) is there something else going on altogether?

the boiler is a relatively new "smith," oil fired, but it's heating a forced hot air system.

thanks a lot.

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Old 12-22-2010, 07:34 PM   #2
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help with boiler pressure/leak


why is that line dripping?
***** CAUTION****Dirt or impediment on the seat , Cool the system down and open the valve for a few seconds to hopefully remove the impediment.******CAUTION***** If valve doesn't stop dripping replace it!

2) how can i lower the pressure?
You are talking about the auto fill valve right?

Counterclockwise to reduce pressure. (Check with manufacturers manual for procedures on filling system)

3) is there something else going on altogether?

Is this boiler being used for both potable hot water and home heating?

the boiler is a relatively new "smith," oil fired, but it's heating a forced hot air system.

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Old 12-22-2010, 07:37 PM   #3
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help with boiler pressure/leak


thanks jackofall.
yes, the boiler is both domestic hot and heating.
to cool the system down - meaning kill the boiler for a few hours?
then blast open that pressure relief valve in the hopes of blowing out sediment?

thanks again.
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Old 12-22-2010, 08:55 PM   #4
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help with boiler pressure/leak


Quote:
Originally Posted by schmolze View Post
thanks jackofall.
yes, the boiler is both domestic hot and heating.
to cool the system down - meaning kill the boiler for a few hours?
then blast open that pressure relief valve in the hopes of blowing out sediment?

thanks again.
Better have a new one on hand when you do that. They often don't close any better)(often worse) then they were before you flushed them. After they have been leaking/dripping for a while.

Then. Look for the cause of it to have opened originally. Could be the expansion tank. Or the tankless coil is leaking into the boiler. Or the auto water feed is feeding water into the boiler when it shouldn't.
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