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Progress! And new issues...
So, I replaced the bad drip trap in the garage (Dunham 2E) with a new cap and disc - and the pipe below it is no longer 212 degrees. This allowed the radiator in the garage to heat up more. There is still a light hammer at startup, this may be due to bad traps in the radiators above (I believe there are two-three radiators serviced by this return line.)
Along with that - came new levels of pressure! I saw the gauge get as high as it ever has - 0.5PSI (8oz). Previously it would struggle to raise above 0.1PSI, as steam was blowing into the dry return. However, I happened to notice it as I was measuring the temperature of crossover/drip traps in areas of the basement, and I heard water - I rushed over and saw the gauge at 0.5PSI, and water was pouring out of my brand new Gorton #2.
So - I know from reading Dan's books now - my B dimension raised due to increased pressure. Since there used to be a Dunham Air Eliminator (trap/vent) here - it wasn't an issue when the traps were all working. But now, the Gorton #2 has to be raised up.
Here lies the issue.
The Air Eliminator was connected at the top of the equalizer, and in the middle (see pics). Now that the Gorton #2 is only connected in the middle (and the top is capped off) - when my pressure is higher (8oz as it should be), the B dimension is as well - causing water to pour out.
The top of the equalizer connection is about 2 inches from the ceiling, and it is my understanding that air vents should not be mounted horizontally.
So, my question is - can I put a few elbows and nipples on the top 1/2" connection, and bring it lower - so I can mount the Gorton #2 vertically? See proposed drawing.