How Close Can I!

Rich Davis_2

How close can I place the suction side of a 008 circ.to a Taco 4900 air sep.  Siggy talks about having 10 pipe dia. from a Elbow, would this be the same or can I get by with less distance.  Thanks

Mark Eatherton

Let them kiss if you can....

Or just hold hands if you are so inclined...:-)



You can't have the pump too close to the PONPC (expansion tank) but obviously need isolation valves, nipples etc.



If you are using a regular scoop type air eliminator, some manufacturers call for straight pipe BEFORE the separator, but if you are using a micro bubble resorber type, no straight pipe minimum requirement before or after.



ME



ME

Rich Davis_2

It's more about the circ.

Mark thanks for your reply,

My concern was about not having laminer flow to the circ, would the 4900 seperator cause enough turblence to cause the circ to cavitate.  Sorry I didn't make it clear enough.

Brad White

By the time

the water leaves the 4900, the air is gone and turbulence should be minimal. As Mark said, an upstream isolation valve (full port) is a good idea anyway and affords additional length. I also would not reduce it. For example, if your 4900 is 1.25" then so should your piping up to and including the pump flange.



The 4900 itself has no minimum upstream nor downstream restrictions per the literature.



My own boiler now has a 4900 screwed on the male outlet of a street el and immediately downstream of the 4900 is an isolation flange with drain, then a Wilo Stratos Eco as my boiler circulator, all piped 1.25". Works great even from first start-up/first pass.



Yes, the isolation valve is a chaperone between the Taco 4900 and the Wilo circulator. As much as I agree with ME, there is still something illicit about forbidden love in hydronics.