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Re-filling Hydronic System
LmAcres
Member Posts: 7
Hi Everyone
Time to refill my system after some major renovations. A coworker has said that I should close the domestic make up water valves once the system is filled and bled, but I thought they are to remain open? The (2) yellow valves are currently in the closed position in the picture, but this coworker has me questioning what I thought to be true. He's a retired homebuilder and knows his stuff, but hoping I could get a second opinion.
Thanks
Time to refill my system after some major renovations. A coworker has said that I should close the domestic make up water valves once the system is filled and bled, but I thought they are to remain open? The (2) yellow valves are currently in the closed position in the picture, but this coworker has me questioning what I thought to be true. He's a retired homebuilder and knows his stuff, but hoping I could get a second opinion.
Thanks
0
Comments
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You have just tapped into a long-term debate. If you close them, what is there to prevent the boiler from running dry and melting down? Personally, unless you have a low water cutoff (I don't see one in the picture), I think you should leave them on."If you can't explain it simply, you don't understand it well enough"
Albert Einstein4 -
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Steve Minnich said:“He knows his stuff”? That’s a recipe for disaster without a LWCO.0
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For about 50 years now I have been installing and leaving fill valves open.
I suppose one flood or lawsuit could have changed my mind
Another option is to use a fill tank, like an Axiom. Or a homemade fill take built with an expansion tank and prv. You want to maintain pressure on a newly filled system as it will purge air for several days or more, until multiple heating cycles drive the entrained air out of solution. A purge alone will not accomplish that.
I third the LWC, regardless.Bob "hot rod" Rohr
trainer for Caleffi NA
Living the hydronic dream0 -
hot_rod said:For about 50 years now I have been installing and leaving fill valves open. I suppose one flood or lawsuit could have changed my mind Another option is to use a fill tank, like an Axiom. Or a homemade fill take built with an expansion tank and prv. You want to maintain pressure on a newly filled system as it will purge air for several days or more, until multiple heating cycles drive the entrained air out of solution. A purge alone will not accomplish that. I third the LWC, regardless.Steve Minnich0
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