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[U.P. Doug]

I am getting close to finishing my install and am ready to buy my pumps and could use some advise as to sizing them. I have a ridgewood 7500 and my loop to the house in 75' and it is Logstor. I have 25" of 1" copper in the basement going to a 20 plate exchanger for my Domestic water, then 10' of 1" copper to my water to air exchanger 15" by 20" then returning back to the logstor which is 30 more feet of 1" copper. I have eight 90 degree elbows in the loop and the plate exchanger and water to air are 1" feed brazetek units. I would like to put my pump inside as it is below the boiler.
My second loop is to my attached garage. 30' of Logstor, 4' of 1" copper to a Recycled Hydraulic oil cooler with 1 1/2 npt fittings in and out and two independent fans, then 4' back to the logstor. This pump will be on the boiler, with the garage exchanger at floor level.
Any advice would be appreciated! I am thinking Grundfos, just not sure of sizing.

[slimjim]

Are you going to put the plate exchanger on a separate loop or feed all the water on the house loop through it.

[U.P. Doug]

I was planning on running all the water through one loop unless that is not a good idea.

[slimjim]

Simply that running all your boiler water through the domestic plate exchanger will increase the resistance and make the circ work harder, if it were me I would use a mono-flo tee in the main loop to supply the plate exchanger.

[U.P. Doug]

That's why I am here Slim! That makes sense to me, I will do that on my basement loop. Any ideas on pumps with the momo- flo tee in place? Thanks for your help!

[slimjim]

I Think I would use the 26-99 three speed, if you put temp gauges on the supply and return, put the system under full load , check differential on the gauges, runt the circ just high enough that you have less than 20 degree differential

[U.P. Doug]

Thanks Slim. I do have some commercial inline temp gauges that I was planning on installing. Would the same pump work in the garage loop, or is it to big for that one loop. The exchanger is big, about 18" by 38" but has separate fans and I intend to run only one of them to heat my garage with the ability to plug the second fan in if needed. Just looking to keep my insulated 26 by 36' garage around 50 degrees.

[slimjim]

Yes it will work just fine, the 3 speed will give you the ability to keep that Delta T below the 20 degrees

[U.P. Doug]

Thanks again for your help!

[slimjim]

 Anytime!

[U.P. Doug]

Looking at Monoflo-tees and I see the 1" ones have a 3/4 outlet on them. Will 3/4 be enough to heat my domestic water without issues? I do see a 1 1/2 Monoflo with a 1" outlet and I could expand to 1 1/2 before the plate exchanger then reduce to 1" down line. Your thoughts?

[sceptre74]

Slim designed my system and 3/4 is what my domestic is plumbed for

[U.P. Doug]

Thanks sceptre74 ! I can get it on the way now.

[RSI]

If I was installing the system, I would use a Grundfos 15-58 pump and put the plate in series with the water to air heat exchanger.

With the size and length of pipe you have and being a 20 plate you should have plenty of flow.

[U.P. Doug]

So you think I should run through the plate exchanger, then to my water to air then back to boiler one loop? I read enough on here to know everyone has their way of doing it, and that is why I am here looking for options from people that know far more about this than I do. I do appreciate yours and anyone else's opinion.