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WATERLOGGED 2 PIPE RETURN

WE SERVICE AN OLD COAL TO GAS CONVERSION (CONVERTED 1948?) TWO PIPE SYSTEM HANDLING A 3 STORY MUNICIPAL BUILDING WITH ATTACHED 1880s 3 STORY HOME.  IN THE HOME WE HAVE A PROBLEM WITH A SERIES OF PARALLEL RADIATORS THAT BACK UP WITH WATER AND COOL OFF.

ALL HAVE 17C TRAPS ON THE RADIATOR DISCHARGE, AND F & T BUCKETS ON THE END OF THE SUPPLYS & ONE ON ONE RADIATOR RETURN

THE SET OF RADIATORS CAUSING PROBLEMS DRAINS INTO A 3/4 THEN 1, THE 1.5 THEN 2" IRON LINE, 7 FOOT OFF THE FLOOR.   THE LINE SLOWLY DROPS THEN DIVES TO THE FLOOR RUNS FOR ABOUT 20' HORIZONTAL AND RISES INTO A MANIFOLD 2 FOOT OFF THE  GROUND, AND INTO AN UNTRAPPED LINE ENTERING THE CONDENSATE PUMP.

IT APPEARS WE HAVE 2 OR 3 OF THE 7 RADIATORS WITH BAD T-STAT ELEMENTS (BAD IN THE CLOSED POSITION)

I AM THINKING THE MAIN PROBLEM IS A VACUUM BUILD-UP IN THE RETURN BECAUSE OF THE CLOSED / BROKEN T-STAT TRAPS NOT VENTING AIR / BREAKING A VACUUM,   AND BACKING UP THIS ALREADY SERIOUSLY TRAPPED SYSTEM.

I AM CONSIDERING ADDING AN AIR VENT ( ANTLER SYSTEM) TO THE TOP OF THE BEGINING OF THE RETURN SYSTEM (GORTON #2s) 

ANY OPINIONS OR ADVICE?  
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