Should this valve be on or off

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  #1  
Old 08-11-16, 07:03 PM
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Should this valve be on or off

System is a gas fired hot water baseboard. 3 heating zones as well as an indirect hot water heater. I have a valve that was halfway on the 3 zone loop of the system with the handle removed. Should this valve be on or off or halfway on like it is? It is located in a loop between the output and input of the 3 zones. See attached picture. I put red lines to show the loop and circled the valve.

Thanks for the help!

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Last edited by PJmax; 08-11-16 at 10:37 PM. Reason: enlarged pic to board max
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Old 08-11-16, 10:39 PM
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That valve is used for boiler bypass. It keeps water circulating thru the boiler.
The handle is off for a reason.... leave the valve as it was.
 
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Old 08-12-16, 04:35 AM
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Yeah, they use it as if it was a differential pressure valve.
Basically they are trying to ensure there is enough water flowing thru the boiler when only one zone calls.
Really not the best way to do this. It is certainly not would TT would be recommending, they would want to see primary-secondary piping with close spaced tees.
Alternately, install a buffer tank so the boiler pumps into one side if it, the the system flow thru the other side of it.
 
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Old 08-12-16, 06:50 AM
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Right now the ball valve is halfway on. Should it be fully on?
 
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Old 08-12-16, 08:33 AM
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It was probably set by the person/company that installed the system.
Do you still use them ?

I would not change the valve setting from the way it is currently set.
 
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