I closed the gate valve that isolates the compression style expansion tank and drained it. I'm guessing that it was maybe 1/3 full. I did notice that there is a fitting similar to this (the L-shaped one with a brass stick top extend to the top of the tank: http://www.pexsupply.com/Bell-Gossett-1 ... -8624000-p
What is the second cast iron device next to this? I don't have one of those and finding good literature on these seems to be difficult.
This is screwed into the bottom of the tank. In the description of this product it says: "Airtrol Tank Fittings must be used with the appropriately sized In-Line Airtrol or Rolairtrol air separator." Does this mean that a regular air separator like this should be used?:http://www.pexsupply.com/Bell-Gossett-1 ... -8601000-p
The top fitting of this air separator would then be plumbed to the style compression tank that I have? Reading the Bell and Gosset .pdf it says:
"The IAS-1½ and IAS-3 have a ¾” NPT tapping to accept a high capacity air vent or can be piped to a plain steel compression tank. The IAS-1 and IAS-1¼” have a 1/8” vent tapping to accept an air vent. All models have a ½” NPT bottom tank connection."
Another thing I am reading is that the auto air vent that I have on the top of the EFM is a big no-no with a conventional style expansion tank? I am reading that this will lead to a waterlogged expansion tank but I didn't seem to have an issue with that.