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[american-pacemaker]

Hey Slimjim I attached a new drawing for my primary / secondary design for the hot water boiler in the house. I could not fit the design of the drawing that I showed you and dan when you stopped at the house because of size limitations. The new design will fit where I need it to. Do you see anything wrong with the design ? Anyone else please feel free to critique the design as I am getting ready to order a lot of copper fittings.
Thanks, Larry

[slimjim]

Nice job, long radius 90's right?

[american-pacemaker]

Yes all the 90's will be long radius. The main tube will be 1 1/2" with 1" on the water heater and 3/4" on all the baseboard.
Should I add a drain valve on the bottom leg of the header do bleed the system or is that a waste of a valve ?

[mlappin]

Only thing I see is might add a few more T's with caps for future expansion.

[american-pacemaker]

I thought about that the problem is space. Primary / secondary physics says minimum 8x pipe diameter on supply side and 4x pipe diameter on return of each set of tee's which is really cramping me for the space I have. One of the secondary runs in the drawing is an extra that will be
capped of.
 

[american-pacemaker]

Should the circulator on the boiler pump into the return or pump into the supply line ? I have been told both.

[slimjim]

Boiler pump? which one oil or wood?  I typically install on the wood boiler supply (top port)?

[american-pacemaker]

Sorry, the pump on the inside boiler.

[slimjim]

If you are doing a primary secondary you really aren't going into the oil boiler,  the return from your primary would be first in the loop and the circ would be installed in the second close T and wired to the c-1 terminal on the aqua-stat.

[american-pacemaker]

Slimjim, in the drawing at the start of this thread I was told by a local guy that my circulator should be on the line going into
the return side of the boiler not where I drew it.

[slimjim]

A lot of the old timers put the circs on the return because the circs back then were thought to not like the temps as well as for space reasons during shipping they were typically installed on the return, in reality it makes no difference, I personally put them on the supply but as long as it is wired to c-1 and done with closely spaced tees, the only water going into and out of the oil boiler is when the circ is energized.

[american-pacemaker]

Thanks !!!!!!

[slimjim]

You are very welcome!

[LittleJohn]

If you get really bored, and don't mind reading a little bit; there is a book out there called "Pumping Away", which helps break down complex radiant installation into plain English

[american-pacemaker]

Thanks Littlejohn I will look for this.