Comments on Design of former Gravity Replacement Boiler Near piping

EdTheHeaterMan

EricPeterson said:

@EdTheHeaterMan - so pumping towards the valve? 

That’s how mine is piped and it works fine, only thing is some is some whining noise when the valve is closed, which I attribute to high water flow (over 7 FPS) due to the GPM and low head pressure.
What circulator are you using?

Eric

So I am retired from working on boilers after over 40 years, and to my dismay, my home is equipped with a heat pump. So there are no circulator pumps here.

My son's home (the one I sold him for a dollar) has a Taco 007 for 5 zones including 2 air handler with water coils, one indirect water heater and 2 radiant floor heat zones that also use a Taco 007 for the lower temperature mixed water.

There is no boiler protection valve on that system because the design is such that the return water reaches 140°F in fairly short order from all the zones because of the way it is piped.

EricPeterson

Oops - I meant my comment for @PeteA!

Eric

EdTheHeaterMan

EricPeterson said:

Oops - I meant my comment for @PeteA!

Eric

My middle name is Peter, so maybe that's OK

PeteA

EricPeterson said:

@EdTheHeaterMan - so pumping towards the valve? 

That’s how mine is piped and it works fine, only thing is some is some whining noise when the valve is closed, which I attribute to high water flow (over 7 FPS) due to the GPM and low head pressure.
What circulator are you using?

Eric

I have the 007e that came with the boiler.

EricPeterson

@PeteA - from my limited knowledge, the 007e looks like a good fit.
As I read the pump curve, even when the Caleffi valve is closed, the GPM will be lower than my NRF-22 so that should mean you will not hear the whining noise that I have.

Eric

PeteA

Thanks @EricPeterson really appreciate your help.

ethicalpaul

My son's home (the one I sold him for a dollar) has a Taco 007 for 5 zones

I think you got kinda screwed on that deal, Ed. The used Taco 007 is worth at least a dollar just by itself!

OldawgBryant

@EricPeterson @hot_rod @EdTheHeaterMan @PeteA Many thanks (givings) to all who gave their help. The system works real damn good! Yes, there is an ever so slight whine when the valve is cold. barely hear it, but I can kill that by cracking the additional bypass below the caleffi a little bit, but with a radio or tv or conversation on you can't hear it at all. goes away after about 120° return temp. I made a mistake of trying to use the old expansion tank and was running around 28psi, but I switched to a model 60 and it brought the pressure down to 12/24 cold/hot. System is real quiet. Here's a photo of running it a couple of times and what the dirtMAG was able to catch

EricPeterson

@OldawgBryant - so glad to hear this update. I was just thinking that I too was thankful for the support received here on the Wall!
As has been pointed out I think that when the valve is closed, the resulting low head lead to a high velocity flow through the near-boiler piping, and that initial noise is unavoidable with some circulators (like my NRF-22). It's not a big problem for me, and I will deal with it after the heating season.

Eric Peterson

PeteA

@OldawgBryant glad everything came together.
You're 100% correct about being thankful for this site.
I personally am thankful to soo many people on here it's hard to list them all but everyone here has been amazing sharing their vast knowledge with common DIY folks like us