Closely space tease primary secondary

riverdog · 12:27AM

From boiler is hooked up with closely spaced tease boiler is working and running fine. Got to looking at it and noticed that on the left coming down into the is the supply and on the right which the pump is on coming out of the is the return that makes a circle through the boiler primary loop, now on the left and right side of the where the secondary hooked up on the left the return water is and on the right the supply is going out to zone pumps, it is opposite, but the boiler is running and doing what it’s supposed to and heating. Is this a problem?

EBEBRATT-Ed · 12:32AM

Can you post a sketch? I think what you are saying is the return and supply from the boiler is reversed. You have to look at the boiler pump closely to see which way it is pumping. Or post a picture.

riverdog · 12:49AM

no the return and the supply from the boiler right the boiler pump is pumping up into the boiler and then out down into the bullhead of the tee, the problem I’m seeing is on the left, which is the supply from the boiler. The return comes in to the left side of the tee, and then on the right, which is the return the supply from the secondary which is multiple pumps is pumping out on that right side. The boiler is running at 120 and it is running good from what I can tell right now there is hot water going out to the floor, with that said, I know it is not right, but will it work just don’t know the dynamics in depth on hydraulic separation and the way it pumps through the closely spaced tease

riverdog · 12:58AM

EdTheHeaterMan · 1:37AM

That drawing is backwards. Here is the easy fix:

So you know how to use the term primary secondary loops properly, the loop with the expansion tank is the primary loop. and that is most likely the system side of the closely spaced tees. The secondary loop is the boiler loop. with the boiler pump on it.

The best place for the expansion tank in this system is just after boiler supply pipe somewhere on the red supply line of the primary loop. The next thing on the primary loop is the circulator pump so the circulator is pumping away from the expansion tank.

If you need to drain everything down to repipe the near boiler piping you may as well make all the necessary corrections all at once. Here is a good diagram for you to follow.

hot_rod · 1:50AM

EdTheHeaterMan · 2:19AM

Oops, I forgot to include the diagram of the system I mentioned above:

See the direction of the system flow, The hottest water does not go past the return to the boiler. The hottest water goes to the system and the return gets fed to the boiler return.

riverdog · 2:40AM

I understand all of what you guys are saying and thank you, but will it ever work piped the other way

Alan (California Radiant) Forbes · 2:50AM

Yes, it will work, but you won't get the coldest return water back to your boiler, so it won't condense as much if at all. Larger fuel bills.

hot_rod · 2:59AM

what you show is known as reverse injection, it will work. The boiler flow would need to be much higher as a % of the boiler supply Is being returned to the boiler.

With direct the mix point is downstream of the close tees.

With reverse the mix is between the tees.

For your type of system it would be worth making the switch to direct

Change flow direction on the horizontal line in your drawing and you have direct

EBEBRATT-Ed · 4:10AM

y

Closely space tease primary secondary

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