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RAD SHARING

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JERRY_9
JERRY_9 Member Posts: 9
in THE MAIN WALL
HELLO,

NOBODY IN PHILADELPHIA, PA CAN ANSWER MY QUESTION YOU'RE MY LAST HOPE.

I'VE ADDED A NEW BEDROOM ON THE SECOND FLOOR. VIA A HEATSCALE IT HAS BEEN DETERMINED THAT NEW ROOM NEEDS A 10,000 BTU RADIATOR. I THINK I HAVE A TWO-PIPE HOT WATER SYSTEM WITH THE MAIN AT 1-1/4" MAIN (IRON), FEEDING TO FIRST FLOOR RADS AT 7/8" (IRON),AND 1/2" (COPPER) TO SECOND FLOOR RADS. HOUSE BUILT 1951 AND ALL THE PIPES SEEM TO HAVE PITCH.

MY QUESTION IS:
CAN THEY RUN THE NEW PIPES TO THE NEW RAD IN NEW BEDROOM FROM AN EXISTING RAD IN AN ADJACENT ROOM, OR DOES THE NEW RAD HAVE TO BE FED FROM THE MAIN? ALSO, IF THESE RADS DO SHARE, WILL NEW ELBOW JOINTS FROM THE ADJACENT ROOM, AND THE DISTANCE BETWEEN THEM, ALLOW FLOW? THE REASON I'M ASKING IS BECAUSE THE ADJACENT VERY SMALL BEDROOM HAS ALWAYS BEEN TOO HOT, AND I THOUGHT SHARING MIGHT HELP THE SMALLER BEDROOM TO NOT BE AS HOT IF WE STOLE THE SMALL ROOM'S FEED TO THE NEW RAD FIRST,AND THEN BACK TO THE RAD IN THE SMALLER ROOM SECOND. IS IT POSSIBLE TO HAVE AIRLOCK AT THESE NEW 90 DEGREE ELBOWS? HOW DOES HOT WATER FLOW UP AND THROUGH A RAD IF THE CIRC PUMP IS PUSHING WATER AROUND THE MAIN WITH MANY RAD'S FEEDING VERTICALLY?

THANKS,
JERRY

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