primary secondary

viv

I am installing a hot water heating system with the following components. 1 200,000 condensing boiler,1 low tem heat pump loop(80 deg wat) 1 domestic hw loop(indirect tank) 2 radiant zones(i in slap,1 in floor joist).The engineered drawinw i was given was incomplete (my opinion)

I would of posted what i have for a drawing but trying out how to post it ,But i was planning to pipe it this way.I would pipe the boiler as the primary loop complete with its own pump 20 -30 gpm,I would tie in all other circuits as secondary.The first set of tees would be the dom hot water loop,followed by the radiant zones (variable speed injection) and last the heat pump loop(with injection) and back to the boiler.

any ideas! thanks

heretic

Link

Try this link:
http://www.pmengineer.com/CDA/ArticleInformation/features/BNP__Features__Item/0,2732,101268,00.html

kf_2

Injection w/condensing boilers.

Injection pumping with condensing boilers is a no-no. Injection was designed to protect boilers by elevating return water temps. With condensing boilers you want the return temps as low as possible.



kf

Bart

Condesing

Keeping in mind low return temps to gain full condesing benefits. Delta T on primary must be great in this design,
primary/secondary also adds conventional boiler protection.
See boiler mfg for piping info.