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Author:
TStan
recently had newer oil house furnace cleaned, I see valve above furnace which leads to grey expansion tank is now closed, it should be open correct?
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Author:
TStan
I have left furnace running with valve closed now for 3 weeks, any damage to system with valve closed?
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Author:
packy (MA)
no, the relief valve will blow if the expansion is not absorbed by the tank. i'm surprised it hasn't blown ???
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Author:
North Carolina Plumber (NC)
If the valve is a few years old it's probably not shutting off at 100%.
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Author:
TStan
the furnace is 3 years old, it is a FHW system with glycol in pipes, and the hot water is heated inside the furnace - since it has been running now for 4 weeks without issue - the valve that is closed is connected to the domestic water - and I can see that the glycol piping is connected to the expansion tank... so this valve may have to be closed so the domestic water and glycol do not mix?
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Author:
packy (MA)
confused... is the valve for the fill valve connection?
post a photo please..
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Author:
hj (AZ)
Does that mean the valve is NOT Connected to the expansion tank as first stated? A glycol system needs a lot more than just a "shut off valve" to prevent backflow of the glycol into the domestic water system.
Edited 1 times.
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Author:
Paul48 (CT)
Need a lot more info to safely comment on this one. Hopefully there is back-flow prevention on the system.
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Author:
TStan
I don't have pict... Above furnace on left is Dom water feed then back flow preventer then closed valve then link to expansion tank and glycol piping and circulators... I am concerned oil furnace tech who cleaned 4 weeks ago closed valve when cleaning system and forgot to reopen?
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Author:
packy (MA)
no need to shut off the water to the boiler when cleaning.
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Author:
hj (AZ)
From your description, that valve is a secondary prevention against backflow. With a glycol system, you do NOT want "fresh water" being added to the system to dilute the glycol, in the event of a leak. You want to know it is leaking so you can fix it.
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