kevin.m.l wrote:In the diagram supplied with my new boiler it shows the circulator on the return side, and the expansion tank off the top of the boiler all by itself. The directions specifically state "do NOT connect the tank to any other part of the heating system." So after reading thread after thread and most of the book modern hydronics, I am leaning towards ignoring the directions and putting the circulator on the supply side with tank on inlet side of circulator. Anyone have suggestions, comments or experience hooking up a ka6? (Specifically with why expansion tank is supposed to be isolated from system. )
Yes I would also ditch the Keystoker instructions relating to pump placement and expansion tank.
Make sure you have at least 18" of strait pipe before the air scoop. Plumb the expansion tank and the boiler fill supply into the bottom of the air scoop. an air bleed goes on top of the air scoop.
The Pump (or pumps) need to have at least a 12" strait vertical run before and after the pump. don't forget the check valve after the pump.
This will give you a "pump away" system. Place air bleeds at the top of each run. I would run a boiler bypass as in the Keystoker instructions.
I used a large floor mouted expansion tank. This helps to avoid PRV blowoffs in case of a temp overshoot.
Don't forget the shuttoffs and unions like I did!
This type of settup alows all the air to bleed out of the system and with the bypass keeps the boiler at a nice even temp.