Baseboard feed connection

Unknown

I came across the same problem a few years ago on a job I inherited. Although I dislike steam being used with BB,that`s what I had to work with. I moved the supply to the top tapping one end, and because the rads were quite long, I also graded them (slightly) towards the outlet.
Watch your venting rate, as they can, and will "hammer" if its too fast.

bruce d

Baseboard feed connection

Question is supply feed connection to a WM No. 9 CI baseboard when used in a two-pipe vapor system.

Question is raised because Burnham web site (www.burnham.com/tips/cfm/)says "The supply should be piped into the bottom tapping at one end of the baseboard, and the return into the opposite end lower tapping."

WM rep indicated the upper tapping should be used for the supply which seems correct to me. However, he seemed somewhat uncertain. I didn't find any statements about this in the WM and Burnham installation instructions.

I am confused, which seems to happen more often these days. Which tapping, in your judgement, is the preferred one to use for the supply?

I thank you -- Bruce

frank_25

#9 Snug baseboard....

....IMO is for nothing else than forced hot water. The 3/4" water ways cast within the BB are too small for steam and condensate. Someone else may dispute this, bwdik?ijap.

Unknown

Which tapping to use?

> Question is supply feed connection to a WM No. 9

> CI baseboard when used in a two-pipe vapor

> system.

>

> Question is raised because Burnham web

> site (www.burnham.com/tips/cfm/)says "The supply

> should be piped into the bottom tapping at one

> end of the baseboard, and the return into the

> opposite end lower tapping."

>

> WM rep

> indicated the upper tapping should be used for

> the supply which seems correct to me. However,

> he seemed somewhat uncertain. I didn't find any

> statements about this in the WM and Burnham

> installation instructions.

>

> I am confused,

> which seems to happen more often these days.

> Which tapping, in your judgement, is the

> preferred one to use for the supply?

>

> I thank

> you -- Bruce

Ken_40

Dave's right!

Even the slightest pitch from dead level will allow condensate to drain adequately in all but the longest CIBB installs. A Heat-Timer Vari-Vent allows variable venting speeds, and is almost "essential" to dialing in for the narrow dynamic of good functionality - and banging, the result of steam crashing into (and imploding) into lingering and cooler condensate.

On short runs of CIBB (under 6') I have had no problems with just "dead level" and slow venting. No banging ever. But then, I never let typical steam systems run over 2 p.s.i as well. Most work well at half a pound (requiring a vaporstat vs. a 0-10# 404 pressuretrol

bruce d

Thanks for the input

This baseboard is 6 feet in length. Pitch is now 0.25 inch per foot. I do have the adjustable air vent mentioned and will experiment with it.

The reason for the re-installation (not complete yet) is because the original installation, which replaced a small radiator, was piped incorrectly allowing condensate to form a water seal in the supply line. Could hear lots of gurgles but no heat for a number of years. Pitch of that pipe has been corrected now, so upon completion and replacement of the flooring everything should be OK.

I may reduce the BB horizontal pitch somewhat because it looks somewhat weird with the current pitch. I will have the supply piped into the upper tapping as suggested. It was piped into the lower tapping.

I thank you all so much for your input. Thank you.

Bruce