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Wood burner with in-floor heat
Hello all, I am new here, but I've been in the hvac business for 22 years. I am a member at HVAC-Talk, and I've read a lot of stuff from Dan Holohan. So figured I'd post something here to see if I can get some input. This is regarding a system / set-up that I have not done before...
I got a project my customer asked me about and I'm trying to think it through. I was asked to hook up and commission a system where majority of the components are already installed, or on-site to be installed... But I'm having some trouble thinking about the proper way to do this. I've never installed this type of system before. So any advice would be appreciated.
The customer has built a garage with in-floor radiant. He has an outdoor wood burner to be used specifically and only for the garage heat. It's a Central Boiler model CL 6048.. The wood burner is way bigger than necessary for this 50x80 garage, but that's a different story.
All tubing in installed in floor and concrete is complete. Outdoor wood burner is already in place, and supply and return tubing is installed from wood burner to garage. Customer has manifolds and all fittings on-site, he has the necessary circulator's, flanges, and also a mixing valve. He even has a thermostat and a zone control. This is a single zone by the way...
So my issue is, how is this system supposed to be hooked up? To my understanding, the outdoor wood burner is not a sealed hydronic system and no regulated water pressure is to be applied to the wood burner. It just gets filled with water and circulates as needed. I assume the wood burner has a water reservoir of some sort and is open to atmosphere. But the wood burner is installed at an elevation lower than the garage to be heated. So this right here is confusing me to start. How is the water gonna stay in the system when water will find it's own level? Won't all water eventually feed back to wood burner and overflow?
As far as the radiant floor system, is this set up required to have some type of a heat exchanger between garage and wood burner to isolate the systems and have a constant regulated pressure to the radiant? Looking thru the manual of wood burner, this is NOT what they are suggesting. But some of the information from wood burner manual is vague and un-clear. It looks to me that the manual says to pipe wood burner directly into radiant floor system, with the use of mixing valve to maintain temperature to floor, and also a thermostatic valve to maintain temperature of wood burner.
But I'm still confused with this whole idea. Again, the floor of the garage is at an elevation higher than the wood burner (which is open to atmosphere)... So how is the water gonna stay in the system and how is air gonna be eliminated???
Any help or information will be appreciated. Any drawings to reference on piping diagrams?
Thanks for your time