bleeding boilers

Edward A. (Ed) Carery

Jay,

You question is a valid one, and I don't know why you did not get a response before, but I am sure we can help.

If you could post a photo or a line drawing of the subject boiler, it would help so we don’t miss anything when trying to pass along advice.

Also, where if the boiler feed valve located in the system? Is it a fast fill type or just a regular PRV type?

The reason is that a standard PRV type like a Fill troll valve on top of an Extrol tank could be partially corroded and be able to maintain adequate static water pressure in the system when not purging, but it may not be able to maintain adequate system pressure during the purge process.

Depending on your system you may have to change the feed valve if it is worn or corroded. Also, if needed there are a few tricks to using a garden hose and temporarily back feed the boiler through the boiler drain valve, to boost pressure during the purge.

Ed Carey

jaybee

bleeding boilers

I have ask this question before but couldnt get a answer on this post. I dont know if this question is to basic that no no one feel it is worth answering or what the case may be. I was looking for other technitions views the concept of bleeding zones on a boiler.Well, this is my view and i must say i am an apprentist and just trying to learn,but hear goes: 2 zones, honeywell zone vales,2 drain cocks on the retun 1 valve above the circulator isolating (it seems)the bolier.In order to bleed a single zone i will as follows:heat up the boiler
close one off the zone vave manually
close valve above circulator isolating the zone to be blead
lift up fill valve while at the same time relasing water at the return on zone im bleeding Now , when the water temp turn cold i know i have bleed that zone. Is this correct?also what if there was no valve above circulator? Any replies are thanked in advance.

rick in Alaska

bleeding zones

Hope this answers your questions.
It sounds like from your description that you are on the right track. I like to have my feed water enter the system on the opposite side of the shutoff valve for the zone you are doing, with the drain valve on the other side. Then when you open the drain valve, water has to go through all of the piping before leaving the drain valve, thus assuring all of the air will be pushed out.
Best thing you can do is get Dans book in the "books and more" section, which I believe is in the "pumping away" book. It will give you great pictures and descriptions of why.
Hope this helps. Rick in Alaska

jaybee

I dont have a picture,i was just trying to understand the process clearly of what the process is accomplishing.Oh yeah a fast fill valve is on the opposite side. Also what if there was not a shut off above the circulator? and why must this be sut off.

Empire_2

Empire_2

Try this

Hope this helps

Empire_2

J.B. see if this helps

Just a basic concept.