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I HAVE A BUILDING WITH 3 STORIES WEST SIDE OF BUILDING 2ND AND THIRD FLOOR HEATING OK EAST SIDE OF 3RD FLOOR ALSO HEATING OK PROBLEM IS EAST SIDE OF 2ND FLOOR HAS 12 RADIATORS ON SPLIT STEAM MAIN AND RETURN LAST 5 RADIATORS ON LINE ARE NOT HEATING WE OPEN UP NON ELECTRIC VALVES AND VENT AIR OUT RADIATORS WILL HEAT FOR FOUR OR FIVE DAYS THEN LOCK UP WE HAVE CHANGED TRAPS REPLACED TRAPS ON RADIATORS AND MAIN VENT AND TRAP ON RETURN LINE CHECKED FOR BLOCKED RETURNS ON RADIATORS AND MAIN RETURN ALSO CHECKED CHECK VALVES AT BOILER. 2ND FLOOR RADIATORS EAST SIDE ARE ON THERE OWN SUPPLY AND RETURN BOILER IS WEIL MCLAIN OIL FIRED WITH CARLIN BURNER TWO PIPE STEAM THERMOSTIC TRAPS ARE OF VARIOUS MANUFACTURERS THROUGH OUT THE BUILDING SYSTEM IS SET FOR 3LBS OF PRESSURE MAIN VENT IS A #77 NEED HELP IF I LEFT ANY THING OUT LET ME KNOW THIS IS FRUSTRATING TO SAY THE LEAST ALSO BUILDING HEATED FINE LAST WINTER CANT FIGURE OUT WHAT CHANGED MAY BE TO MANY HANDS ON !!!!!!!