I have hot water heat with 2 zones one zone the water dosent circulate, there are no bleeders on this upstairs

Question

how do i get the water to circulate thru this zone, the valve is wide open, but the water seems to just lie there and not move. how do i fix this, is there a air pocket somewhere up there? should i install a bleeder in the line? (to gete the air out)? thanks

Answer 1

There may be a purge set up at the near boiler piping consiting of a valve and a hose bib,you will also need to raise the pressure to push the air out,close the stop valve,open the hose bib,raise the pressure and push the air out.Isolate the other zone while you do this if you can.

Answer 2

I am installing a system with 8 zones, 2 of which are sub-zones.

What you need is a closed system that has a Bladder Style expansion tank with an automatic air bleeder installed on top of it. Hopefully you have a boiler drain and valves to isolate each zone. There, you can introduce pure water from one end and manually bleed the other end until you have purged out most of the air. This is not impossible to do with 1/2" Hepex tubing.

I assume you have a separate pump (separate from the one in the boiler). This is called an injection pump (just a regular pump), and it circulates the water through the 2 zones. The supply and the return must be yoked together less than 12 inches apart.

See here...
http://www.ultimategarage.com/BoilerZoneValves.jpg

Notice that the SUPPLY and RETURN loop right back into the boiler, but with 12" yoked connection, however this photo is not the best example, because I see no circulating pump in the piping loop for the 3 zones.

Answer 3

When air gets into a hydronic heating line, the best analogy that I can come up with, is like trying to push a chain into the pipe. The chain would just jumble up and it would be stuck. On your circulator, if it was installed correctly, there should be a ball valve or a gate valve above and below the circulator. Shut the valve below the circulator into the off position. Above the circulator there should be a drain valave with a hose bib. Connect a hose to this valve and turn it on. The water should flow from the top of the boiler through the heating pipe and empty out through the valve you just opened. The water cannot travel through the circulator becasue the valve below it is shut off. Let it bleed all of the air out of the system until a full water stream appears. There is also a pressure regulator valve feeding water into the heating system. Some of them let you adjust a small lever at the top of the valve by putting it in the upright position as this lets more water into the system.
When you finish bleeding the system, remember to turn both ball valves into the on position, and the pressure regulator back to its original position.
Just use your common sense and draw a digram of the zones that you are interested in bleeding. You can do this.

Answer 4

You can buy automatic bleeders that will get rid of the air for you automatically. You have a air pocket someplace which is causing the hot water to not circulate. Try bleeding from the highest point then work your way back wards

Answer 5

Install a bleeder in the top most pipe. Once the air is out the water will naturally convect thru the pipes once it is hot.