Gas Boiler bleeding

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Old 01-27-14, 01:57 PM
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Gas Boiler bleeding

tried to bleed my system the other day as the pipes were banging a lot. what I forgot to do was open the PR Valve to let water in....

anyway, can you please read/correct my steps in order:

1. shut off boiler (some people say to do this, some don't - I did)
2. let it cool for 20-20 minutes
3. manually turn on (Taco) zone valve I am bleeding
4. attach one end of hose to spigot and the other end to bucket
5. close valve under spigot
6. open valve above spigot to let water out.
7. lift U-shaped lever on PR Valve (Bell and Gosset bell-shaped thingy)

are these steps correct?
 
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Old 01-27-14, 03:26 PM
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Those steps are correct....

If you have air possibly your auto air vents/vent are not working... Or you have low psi in the boiler...

Whats the make and model of boiler?

What does the pressure and temp gauge say on the boiler?
 
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Old 01-27-14, 04:31 PM
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Lochinvar early 90's
3 zone - 1st fl zone seems to be where that banging occurs
14 psi and 125

2nd fl zone seems to be working fine. Heat is normal. 1st fl was set to 70 and stayed at 67-68 all day. 3rd zone is basement and set at 55
 
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Old 01-27-14, 04:49 PM
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1st fl was set to 70 and stayed at 67-68 all day.
Sounds like it cant keep up with the cold...

Baseboard is probably undersized... Need hotter boiler water to compensate...

Bleeding only adds more air... Bleeding gets the bulk of the air out... Once that is done and you have circulation the airvents remove the rest...
 
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Old 01-27-14, 04:58 PM
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Bleeding only adds more air... Bleeding gets the bulk of the air out
Mike, A little confused here. So, I should still try and bleed?
 
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Old 01-27-14, 05:04 PM
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and no other valves to open/shut from my steps above?
 
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Old 01-27-14, 06:17 PM
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Mike, A little confused here. So, I should still try and bleed?
No.. Do not bleed if you have heat and the water is circulating...

When you bleed with fresh water it adds more air to the system...

The noise is more of an inconvienence but if it gets worse flow may stop... When flow stops is when you bleed...

The air elimination device should take care of what you hear...

Is that device working?

Also the banging sounds like its just thermal expansion...

Pics always help...
 

Last edited by lawrosa; 01-28-14 at 09:40 AM.
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Old 01-28-14, 06:39 AM
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well, things just got worse.

Woke up to a cold 1st fl. Was set to 69 and it was 65.

Ran down to the boiler and saw some water below the relief drain. shut the boiler off and bled some more. not a lot of air came out. took 5 buckets and turned it back on.

Had to leave for work and noticed the baseboards "finally" got warmer and thermostat read 66. just left a bucket under the relief drain and will check tonight.

thanks, Mike, but I think there's more to it than bleeding. I'll keep you posted tonight.
 
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Old 01-28-14, 09:43 AM
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Need to check the expansion tank for proper air charge... Fix and auto air vents, verify gauge is working and auto fill valve is functioning.......

Read the stickys t the top of this forum regarding some of these issues...

Take pics... If we can see it we can help you better.......
 
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Old 01-28-14, 11:02 AM
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Old 01-28-14, 11:06 AM
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more info... the air vent thing attached to the expansion tank was just installed a month ago and yes, it's open/loose....
 
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Old 01-29-14, 02:17 PM
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Update:

Had the Gas Co. come and check (contract) and tech says it was the circulator pump, but they have to charge. Told me to get my plumber.

Bought a pump, called the plumber and voila.....heat is back!

Mike, thanks for you time. Appreciate it.
 
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