understanding baseboard heat

Chuck_12

Simply put... I replaced a 16 fin three col cast iron rad 23" high with a new 12' section of cast iron Baseray. The supply pipes remained the same which were 1" galv off a 1-1/2" main. My problem... the baseboard rad does not heat well. Flow seems restricted due to other rad lines heating up more rapidly than this run. From the main I have approx. 20' of 1"supply to 12' baseboard and then return with approx 12' of return. (8' differential) Also keep in mind the static flow of the new rad compared to old column type. Several things may be happening here... other lines from the "Main" heat up fully at boiler temp and therefore the return (when hot) then restricts the cooler flow return from the baseboard line. Hence...slower (or restricted) flow and cooler baseboard rad. The pitch of my piping is fair but due to the new longer run of 8' supply, the pitch is less. Does that matter? Any suggestoins to help me along to get flow back to this radiator? I prefer NOT to use seperate circ pump for just one rad run. Any suggestions? I am guessing that I need to somehow get the baseboard rad run to heat closely to the temp and time frame of the other rad runs to prevent the cold/hot water bucking each other on the return line. Would a mono flow valve solve this, better pitch of lines? Shorten the length of the supply from main to the Baseray so hot water enters sooner? Help!

Mellow_2

can you send a drawing of the pipes and how they connect together. this would help.........

Chuck_12

the pipe run - better described

the 1" pipe come off the supply 1-1/4" main with elbow at top; and then a 10' horizontal run of 1" pipe; then elbos; then a 8' horizontal run of 1" pipe; then elbos up thru floor to 3/4" rad valve connected to Baseray 12' section.
Water retruns from 3/4 outlet of baseray; elbos down thru floor to 10' horizontal run to the 1-1/4" return run enters thru elbow at top of return main. (descripiton casue you have no email addy to send drawing)

Chuck_12

flow of baseray install

heres a sketch....hope you can read it and understand it. thankx.