buderus gb142 piping question

Big Idahoan

We are installing a GB 142 wall hung boiler in a house that we are doing the radiant on, the house has 140,000 btu's of heat loss, 12 zones, 2 temps. Temp # 1 (106 deg.) has a load of 58,000 btu's w/ a flow of 9 gpm. Temp # 2 (126 deg.)has a load of 73,000 btu's w/ a flow of 11 gpm. There is an inderect fired w.h. but no other heating loads on the system. My question is the piping diagram I downloaded off their application manual has two 3-way mixing valves connected to an outdoor reset. Would a taco radiant mixing block work instead of these TC-62 3-way valves. it would be less exspensive to pipe (labor and materials), but would it be as good? what do you guys think?.
My goal is constant circulation.
I will try to attach page 28 of thier application manual in the morning to show you what i'm talking about.


thanks

Ted_9

I was thinking the same think for a job today. I havnt priced it out yet, but by the time you price parts and labor, the RMB-1 may be a good choice.

PATRIOT HEATING & COOLING, INC.

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Big Idahoan

RMB

I priced the TC-62 control w/ the 3 way valve and it was $597.00. The RMB was $606.00. The way I see it the RMB already has the circulator and everything else all ready put together, just just connect the 4 pipes, sensor wires, plug in, and program.

Ted_9

The prices here in MA are different. Substantily. I know the RMB-1 is more money here. I forget what be TC pricing is though.


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Brett O'Connor

Piping a GB Boiler

Hopefully this will get you a better idea. Why not use the Pump Station and Mixing Station with a 2 port block. Just another idea that we have utilized out here.

Brett O'Connor

Drawing in JPEG

Sorry about that. Here it is again in JPEG format

dconnors

Please move the ball valve.....

You cant have a ball valve between the boiler and the LWCO. Please check your local codes. Nice pic.

Big Idahoan

Thanks

For posting that picture, I just got off the phone w/ joe @ buderus and got some info on this set up. This looks like a time saving system.
Thanks

S Daly_2

Brett

What program did you use to create that drawing.

Thanks!

Brett O'Connor

Viso

I used the Visio program for this picture. I should have double checked the drawing for the ball valve. I just through it together for this post. Thanks for the noticing.

Brett