Air Scoop Location

Hello,

I'm doing a tight-space boiler install where I have very little space to work. The boiler is a burnham V8 series boiler. I am planning on using a conventional Taco air scoop with the tank and air eliminator below and above.

According to the burnham instructions, they recommend 18" of pipe between the boiler outlet and the scoop, presumably to settle down the water before it goes through the scoop. I assume that this means "horizontal" pipe, after the elbow on the vertical rise. Does this also mean, there can't be elbows in between? For instance, can I use (2) 9" pipes with a 90 degree elbow in between? If not, it seems I have to expand the space a little.

Thanks for the info in advance.

 

You need 18" of straight horizontal pipe leading into that air scoop. If you're tight on space, use a Spirovent, Taco 4900, or Honeywell air eliminator instead. Cost a bit more, but don't have the straight pipe requirement and generally work better to boot.

The straight pipe requirement is as you suspect to allow the water to settle (actually, allow the bubbles to rise).

 

What size is the piping?

 

The piping I am using is 1-1/2". Its oversized for the 3 zones I am starting with, but I am planning expansion in the future so I played it safe.

 

Large piping should equate to low flow velocity, and thus more time for the air bubbles to rise.

Make sure you pump away from the scoop and tank, having the PNPC at that point will help purge trapped gasses from the boiler water so the scoop can do its job better.