dimension A's B's and C's need help

Ray Landry

I wrote of a steam boiler, heating a HX making hydronic heat, the HX is controlled by valve, then piped to F&T, then drops to return to Hartford loop. this system ,had no air vent,

I did today as Noel suggests below, adding Hoffman #75 high as possible off of unused return plug of trap

This boiler has a pressuretrol set low, boiler cycles 1-3#, the gauge is jumpy, so I'm not exactly sure, the pressuretrol is bottomed out, differential set at 1

here's the question
at 3#, is my B dimension 58" above waterline? if so is it pushing water back up the return that high? if so, its up into the trap and possibbly into the HX.
this system was originally specked to run at 5# by construction docs.

Sunday at 8* OA, hydronics were only making 160*,at full valve, and controller calling for more valve,
today, at 30* +/-, after adding vent, we made 160* with 1/3 valve, we'll see the end of this week.

My main question is B dim. 3# X 28" = 56",
that's the bottom of my header, the HX and trap are below the header.

http://forums.invision.net/Thread.cfm?CFID=455265&CFTOKEN=48ec88a-ecee27c4-7d18-415a-99a1-034baedf2c09&CFApp=2&&Message_ID=56243&_#Message56243

I've got the books so referances welcome, thanx neil

neilc

i'll answer myself, hate it when a post only shows one

the B dimension...

The return water wouldn't back up the return towards the trap because there is steam pressure holding it down if the return is unvented, just as the equalizer does the boiler return.

The air vent doesn't belong on the return side of trap, but off the side of HX. Venting the return is allowing the B dim. to flood up the return to trap and HX.

It took me about an hour staring at it today

Tomorrow i will vent and vac break the side of the HX

One is the loneliest Number at the end of a topic

neil

Bill Nye

Hey Neil

How you doing. I hate it when that happens too.

I would have helped, but I really don't have a clue. Just didn't want you to feel all alone.