HO Purchsed radiant

Paul Mitchell

from somewhere. My partner sold him a new gas boiler and indirect. Weil Mclain GV. Part of the house is cast iron radiators. Part is radiant. Question is....besides the fact that I would have let this one go...How is the best way to pipe this system? I was thinking..Piping the GV per manufacturer specs except that the main circulator will pump constant through the main loop. Then I will have a pump wired to the t-stat through a switching relay for that radiator zone. Then another for the indirect. Then another to feed the radiant manifold..Before the circ to the radiant manifold I was going to put a bypass with a temp gauge in the return and supply before the radiant tubing...Input is appreciated

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J.C.A._3

Paul,

Personally, I would be looking to Tekmar. They make a control that will do all your asking for. Priority for the hot water, a circ relay for the radiators and a mixing zone for the radiant.It will also do outdoor reset and will keep those radiators purring along at a comfortable temp. saving the homeowner money, and you a pile of headaches.

I believe the 363 is the control you want to look at. With the W/M, I highly recommend a bypass. The boiler will like it very much.

Let us know how you make out with this. Sounds like an interesting project. Chris

Earthfire

Propanel

Wirsbo Propanel 311P boiler reset, DHW, high temp zone, mixed zone for radiant. Its set up primary secondary. Hang the box on the wall hook up your piping and wires and let it run. takes the mystery out of designing a primary secondary balanced control panel, and comes with a factory warranty

mph

WM GV

I believe the WM GV Series has an internal by-pass pump, so no additional is needed (Open the top of the boiler and see if there are two Taco pumps in there). I'm not clear on what you are planning to do for mixing on the radiant side. 3-way? Injection? When we long ago used to use WM GV boilers, we would make a short primary loop using their internal pump and then take secondaries off to each load (DHW, baseboard, mixed loop).

Jeff

Paul Mitchell

That is basically what I am thinking



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Paul Mitchell

Panel sounds like the ticket

I assume this would still need a bypass? Getting mixed responses on the bypass...just stick with the one from factory or add an additional also. Gonna call my supplier and get the cost on that propanel tomarrow
Thanks
Paul

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Paul Mitchell

Just looked at the panel on-line

Basically pipe in the supply and return. Tie in the radiant manifold...done. Like it might try it. Any negatives?

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Earthfire

bypass

that Promix Panel has its own primary circ. and the built in Promix control does the mixing and out door reset & domestic hw priority for you. the boiler piping connections in the panel are brass?bronze? circulator flanges. Makes life simple.

mph

WM primary/secondary

If you use tekmar (and maybe the Pro Panel, as well) you will need to re-wire the WM so the reset control has command of the primary pump inside the boiler. If you only take the "Boiler" output to the TT you will end up having extreme short-cycling because the primary pump will only run whenever there is a command to the boiler, not the system pump. I don't know what this will do to the mfg warranty, but I've done it with no regrets.

Jeff

hr

Used to be

the GV's had a Hoffman 3 way thermostatic valve built in, under the hood, for return protection. They worked very well, I have one in my home.

The key is to keep clean fluid in them to prevent seize ups:) The pump under the hood was adequate for the primary, or secondary, loop pumping.

Now I believe they are using an VS injection pump, not unlike the Burnham Revolution, to accomplish the same thing.

I think the Rev still requires a 70F minimun return temperature.

It's not in there to make the cast boiler think it's a condensing boiler You may still need some protection depending on the application. A slab radiant, for example would need additional help. Hw baseboard would probably be fine directly to the boiler.

hot rod

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