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Old 02-04-2011, 07:09 PM   #1
Join Date: Dec 2008
Location: St. Louis, MO
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vent tap for air separator in hydronic system

So I am in the process (still) of putting together my radiant heat system that is comprised of a primary and 3 secondary circuits. For an air separator, I purchased the Bell and Gossett IAS-1 (my primary circuit is 1") to connect to the primary and the expansion tank. The literature and the interwebs state that the vent connection is 1/8"... but when I got the part, I see the connection is 3/4".
Is this the biggest inside joke ever? I don't see it addressed anywhere. Here is the schematics... (PDF)

I double checked and it is the correct part. Am I supposed to use a reducer? Are 1/8" air vents 3/4" NPT????? I AM SO CONFUSED!


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Old 02-05-2011, 01:01 PM   #2
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vent tap for air separator in hydronic system


The literature says that the 1 1/2" unit The IAS - 1 1/2 through the IAS -3 have a 3/4" tap.. Don't know why but there you are..
Yep.. Just reduce the threads or whatever is required.. Just get a air bleed in there and you should be OK..

:-) Ken
The K.C. Ament Co., Inc.

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boiler, hydronic, primary circuit, radiant

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