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New condensing boiler installation.
Here are a few pics of the boiler project I designed. So far the system is working great. The condensing boiler is a Lochinvar knight XL 600. It has a copper primary loop and PVC secondary loop. The supply, reverse return, and manifolds are all PVC #80. I have 8 zones being controlled by our Q-Com environmental computer. Each zone which is 14.5’x120’ has a B&G NRF36 pump doing all the work. I used EPDM tubing installed on 4” centers. The tubing was placed on top of our existing ground fabric with nylon webbing placed every 8’ to allow stapling the tubing on 4” centers. After the tubes were pressurized and checked for leaks another layer of ground fabric was put over all the tubing and distribution manifolds for easy sweeping. I’m currently running at 115F degrees. This is keeping a 74F degree soil temp with a 67F degree air temp. When I do the other half of the range I’ll install controls to vary the temp of the boiler using our Q-com system.
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Boiler Project 2010.pdf, 1.2 MB
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Replies to This Discussion
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Permalink Reply by Dan Wickware on -
About what did somethaing like this cost?
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Permalink Reply by Eric Rohloff on -
We were able to do it for about $1.92 sq/ft. for just parts.
That's everything you see as far as equipment.
There's $3500 just in copper on the primary loop.
I can more then double the heating area on the existing boiler plus I'm all setup to add a second one if I decide to go beyond that. So future expansions will be around half the cost.
We have since added to our other system which uses variable speed pumps with a zone valve for each bed. The tubing and manifolds for that area are identical.
© 2013 Created by Sara Tambascio.
