radiator (cast iron) not heating

Mike T., Swampeast MO

Here's a couple documents that might help. You may not be using B&G fittings, but you should find similar documents for yours.

<A href="http://fhaspapp.ittind.com/literature/files/602.pdf">B&G Red Ring Monoflow Fittings</A> Make certain that you installed the fittings as suggested when two fittings are used for emitters below the main.

<A href="http://fhaspapp.ittind.com/literature/files/699.pdf">B&G Monoflow Fitting Selection Chart</A>

If your flow rate in the main is anywhere near typical (9-14 gpm for 1 1/4" copper) and required flow through the newly installed rad is less than 2 gpm or so, it looks like it would work.

That said, downfeed is <I>always</I> a problem. Also, it's not a good idea to mixed cast iron and fin baseboard in the same loop.

Whenever I've seen a downfed iron rad in a monoflow system with the main branch connections are a perfect straight shot UP to the mains with a monoflow fitting at both. e.g. they're exactly radiator width apart and as short as possible. The branch pipe (and monoflow fitting branch) size <I>also</I> seems to be 1 pipe size larger than I would expect for an upfeed system.

Regardless of what you do, I suspect you'll never get decent temperature balance with the space with the sunrad either over- or under-heating relative to the rest.

straty

radiator (cast iron) not heating

To any professional out there,

I am having a "nightmare" of a problem with a newly installed 58-1/2" Burnham Sun-rad cast iron radiator for the past month. It is not working.
We have a hot water loop system in an office building, which was previously heating heavy output (commercial grade) baseboard. Because we divided one larger office into two offices one of the offices does not have sufficient heating. We installed on the 1-1/4" inch copper main two (2) monoflow tees connecting into 3/4" pex tubing. The two monoflow tees are 63" apart from each other on the main. The length of pex tubing from the monoflow tees to the cast iron radiator is exactly 25 feet.
The cast iron radiator is located "below" the main.
This cast iron radiator is not working! We even installed a valve between the two monoflow tees in the main. Even if we close the valve 80% it "still" does not help. The radiator will only heat if the valve is "completely" closed, which is not good because the main's flow is restricted for the existing baseboard. In the meantime, the main is always very hot and the existing baseboard is "always" working; it's just the cast iron radiator that does not work.
Question: Is the 25 foot run from the monoflow tees to the cast iron radiator too long and unacceptable (remember below main application)?
Question: The arrows on the two monoflow tees point towards each other on the straight main run, on the ceiling. Is this correct?
Question: Can anyone figure out this problem, "WITHOUT" THE INSTALLATION OF A PUMP ON THAT OFFICE'S CEILING, to help boost the flow?
Thanks for any help
Straty

Unknown

looks like you

Looks like you are not getting any pressure differnce between the monoflow fittings to create the flow thru the relocated raditor.. Check the existing boiler pump on the flow that you need..

straty

Thanks very much for your help. Could you tell me if there is any difference between the B&G monoflow tees (round venturi type)and the other type which have an angled "ramp like" water divertor (imported by a company called Leo Int'l in Bklyn, NY). They are both supposed to redirect water flow, but is the B&G round venturi type BETTER?
Thanks