converting gravity system

Steamhead (in transit)

size everything properly and you should be good to go.

Dan C._2

gravity conversion

I am replacing a boiler on an old gravity system. I am leaving off two future zones. One for an indierct when the water heater goes and one for baseboard in an addition. This is how I was going to pipe it. Is it a good way to do it or is there a better way?

Steamhead (in transit)

That's almost a primary-secondary setup

why not go the rest of the way, pipe your flow and return tees for each zone less than six inches apart on the primary (main) loop so they won't flow unless the zone circs are running. Then you can do away with flow-checks too. Pipe the boiler the same way, as a "secondary" loop just like the zones.

Make the old gravity zone the last one coming off the primary loop. It can handle lower temps than the other two. Size the circ for this zone from the chart at the following link:

http://www.heatinghelp.com/newsletter.cfm?Id=125

Check out Dan's book on primary-secondary pumping.

Dan C._2

steamhead

IDo you have a picture how to do that. I am trying to do that. I have never done a primary scondary system. What is the difference/ advantage of what you say and the picture I drew.

Steamhead (in transit)

Try page 80 of Dan's book

"Primary-Secondary Pumping Made Easy". Dan handles this subject much better than I can. You especially want to read the parts about sizing the various parts of your P/S setup, this is critical to proper operation.

Dan C._2

ok

Ok what about if I did this instead?