need some help

[threequez]

I ran a new Radiant heating zone in a basement bath from the existing boiler and baseboard heat zone (See Illustration of the setup I have attached) for some reason I am having problems getting the radiant portion to circulate. I bled the lines and when I disconnect one end of the line from the manifold the hot water does shoot out but when I reconnect it it does not circulate. Any advise would be appreciated.

jt3008

[NHMaster3015]

Water always follows the path of least resistance. Your radiant loop is much more resistive to flow than the base board loop and they both share the same return. You may be able to sort it out with a couple of check valves but to do this properly the boiler needs to have "primary \ secondary loop piping with closely spaced tees and a circulator dedicated to the primary loop. Then the other two loops need their own circulators and controls. Check this site out for proper piping diagrams.

www.heatinghelp.com (http://www.heatinghelp.com)

[PlumbingSkool]

Water always follows the path of least resistance. Your radiant loop is much more resistive to flow than the base board loop and they both share the same return. You may be able to sort it out with a couple of check valves but to do this properly the boiler needs to have "primary \ secondary loop piping with closely spaced tees and a circulator dedicated to the primary loop. Then the other two loops need their own circulators and controls. Check this site out for proper piping diagrams.

www.heatinghelp.com (http://www.heatinghelp.com)

Yes, I totally agree with what was mention above, !:D

[HVAC HAWK]

it does not look like the piping is right try this

http://i154.photobucket.com/albums/s279/hawk63/primary_secondary2zone_mixvalvesetu.jpg
look at this site http://www.houseneeds.com/shop/HeatingProducts/boilers/baxi/boilerprimaryloop.asp

[Masterplumb]

Is it me or is there no return back to the boiler? Why not run a seperate zone for the radiant? :smack-head:

[mtnman1100]

Did you run a new line with its own pump,the pump needs to be sized according to head pressure and gpm. The tees off the loop need to be close like NH Master said. the tees should be with in 6or 10 pipe size diameters of each other.

[NHMaster3015]

Is it me or is there no return back to the boiler? Why not run a seperate zone for the radiant? :smack-head:

I noticed that also and put it down to a bad drawing.

[threequez]

there is a return to the boiler (forgot to draw it in the pic) I tried to keep this as simple as possible as i am not a plumber by trade but I do however understand plumbing. I figured by using the basement baseboard zone valve and loop and be adding a pump for the radiant portion of the loop it would work. I thought about adding a new zone for the radiant heat but it appears to be more involved.

jt

[HVAC HAWK]

there is a return to the boiler (forgot to draw it in the pic) I tried to keep this as simple as possible as i am not a plumber by trade but I do however understand plumbing. I figured by using the basement baseboard zone valve and loop and be adding a pump for the radiant portion of the loop it would work. I thought about adding a new zone for the radiant heat but it appears to be more involved.

jt

it does get involved for a good reason you cant run the same temp water in the slab as you do in base board heat .the floor will get to hot to walk on and it may crack the slab .

[threequez]

doesn't the mixing valve take care of that?

[NHMaster3015]

Vistit this site www.heatinghelp.com (http://www.heatinghelp.com)
Get a hold of a copy of Pumping Away. It's a short paperback tutorial on hydronic heating, piping. Worth it's weight in gold. You're probably not going to want to hear this, or for that matter believe this, but if you want this to work right, you will need to tear it apart and re-pipe it correctly.

[HVAC HAWK]

Vistit this site www.heatinghelp.com (http://www.heatinghelp.com)
Get a hold of a copy of Pumping Away. It's a short paperback tutorial on hydronic heating, piping. Worth it's weight in gold. You're probably not going to want to hear this, or for that matter believe this, but if you want this to work right, you will need to tear it apart and re-pipe it correctly.

i have that book now for 15yrs or so and still go back to look at it for info at times . i also have one of his books on steam .

[mtnman1100]

Vistit this site www.heatinghelp.com (http://www.heatinghelp.com)
Get a hold of a copy of Pumping Away. It's a short paperback tutorial on hydronic heating, piping. Worth it's weight in gold. You're probably not going to want to hear this, or for that matter believe this, but if you want this to work right, you will need to tear it apart and re-pipe it correctly.

I've been hearing about this book too. The author has more good books on the subject too.