Fully Open OR Fully Closed? (pics)

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Old 10-26-15, 05:14 PM
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Fully Open OR Fully Closed? (pics)

Just moved into this house with radiant floor heating. Can someone tell me what this valve is for? and is it normally closed or opened? Currently, it is halfway between open and closed... that can't possibly be correct, can it? This boiler is only for the radiant heating with 4 zones. Please see pics... I can post more pics if needed. TIA.

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Old 10-26-15, 05:25 PM
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Welcome to the forums.

That valve is there for boiler bypassing. It helps control flow and the heat of the water thru the boiler. Don't change it from where it's set now.

NJT, the forum pro, can explain it better and maybe how to set it.
 
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Old 10-26-15, 06:00 PM
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The bypass is there to control the minimum return water temp and, thus, to avoid damaging condensation in the boiler and flue. The valve appears to be a ball valve - a globe valve would be better suited for throttling flow.
 
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Old 10-26-15, 06:38 PM
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Yes that a boiler bypass as stated..

The issue I see with it it that its tapped in before the pump. It should be after the pump.

The object is to restrict flow through the boiler so the boiler heats up to temp. This is because the radiant lines will cool down the temp of the boiler water and never reach operating temps..

The reason it should be piped after the pump is to retain flow through the loops.. Right now if your throttling that valve to reduce flow through the boiler you are also reducing flow through the loops...

It may be that way for a reason per previous homeowner.. I would like to see it fully open , but you would need to monitor the boiler you be assured you reach proper temps at the boiler...


Your pump is pumping down right? Im pretty sure it is by the shape.

[ATTACH=CONFIG]58003[/ATTACH]


But wait... Edit:::: That may be a system bypass..

Let me think about it as I have to re read the benefits of both options...

[ATTACH=CONFIG]58009[/ATTACH]
 
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Last edited by lawrosa; 10-26-15 at 06:56 PM.
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Old 10-26-15, 07:47 PM
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That may be a system bypass..
Yes, it is.

If I recall correctly, the Mini-Hot boilers are copper tube heat exchangers... and they ABSOLUTELY REQUIRE a SYSTEM bypass to insure adequate flow across the heat exchanger.

Unless I recall incorrectly.

When you say RADIANT, do you mean tubing in the floor? Or do you mean baseboards?
 
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Old 10-26-15, 08:58 PM
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Thanks for the replies. I have left the valve as is.

When you say RADIANT, do you mean tubing in the floor? Or do you mean baseboards?
It is radiant in-floor tubing.
 
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Old 10-27-15, 06:46 AM
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For radiant in-floor heating there should also be tempering valves that limit the temperature of the water sent to the floor, and a SYSTEM bypass can not perform this function.

I did not see any tempering valves in your pictures.
 
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