circulator

oldbobcat

How much resistance would there be to push water thru a standard carridge type Taco cicculator? Assuming the circ works but in not on?

icesailor

Circulator:

Why would you want to do it?

hot_rod

depends

on how much flow you are moving, I suppose. i doubt their is much resistance..



It's common to see this on solar drainback systems with dual pumps. Both circs run until the siphon is established, one drops off and the second is going along for the ride.



I'm trying a dual pump on my wood boiler buffer tank. One pump charges the tank, pulling cool water from the bottom and hot into the top. When the wood fire burns out and the tank is stratified, I pull the hot from the top to run through the night of a day or two without reloading the boiler.



hr

EricAune

Why not build a bypass?

Hot Rod,



You drawing shows the circs opposing one another, why not build a bypass?  you could go with flow check valves to keep it simple or even zone valves if you wanted.  

hot_rod

sure

It could be piped a number of ways. I also looked a a 4 way valve with an operator that would switch from one set of ports to the other. Like the flow reversers we use for long loop radiant "fixes"



hr

Charlie from wmass

I was thinking

and we all know how that causes issues. If you simply piped 2 circs one above the other pumping horizontal in opposite directions with IFC pumps the worse that will happen is them pumping in a circle if the controls go wonky. as you have it they will dead heading. also the flow rates I would think would be better with the by pass method. One reason I never end up installing a wood boiler is I do not want to accommodate that 500 gallon tank.

hot_rod

another good idea

like this Charlie?



I have some old brass drainage Ys that it could be piped with to help prevent the pumps going around in circles.



The control I have uses a double throw relay, so only one pump can be energized at a time. Even if the relay or control fails only one contact is "made"



This system is in my shop so accommodating that 500 gallon tank was not an issue. The days of $3.00+ a gallon LP, again, on the horizon, keep me motivated to use wood as a fuel source.



hr

Charlie from wmass

Yes thats it

I would not have worried about using tee's. I like that you put the pump under I was thinking above the pipe but your way will be better for not trapping air.