Issue with oil boiler curculating water constantly

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Old 01-06-16, 09:29 AM
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Issue with oil boiler curculating water constantly

Hi guys. I have an oil boiler/hot water baseboard system. The boiler fires up and cycles normally. However the water itself is almost always cycling through the system. Even when the boiler is not firing.
I'd say about 90% of the time the water is cycling through the system. You can hear the pump, hear the water flushing through.

Not sure why this is happening.

There is a 2nd boiler for another floor that works perfectly, and does not exhibit this issue. Both boilers are exactly the same. Pressure, temp, etc....all reads normal.

Any ideas?
 
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Old 01-06-16, 10:45 AM
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I don't have many answers, but I don't believe that it is normal to hear the water actually flowing. I would first bleed the air from the system.
Could there be an issue with your thermostat?
 
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Old 01-06-16, 10:51 AM
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The circulator and the burner do not always run in synchronism in modern forced hot water boilers.

The burner should turn on and off depending on boiler water temperature.

Thr circulator usually turns on and off via the room thermostat.
 
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Old 01-07-16, 08:26 PM
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Maybe the application is set up that way. In the 60's the University of Illinois tested for Hydronic Institute and one thing they tested was constant circulation among other things. The proved the comfort level was increased by constant circulation and cycling the burner as needed. There was also a fuel savings. the thermostat only demanded heat until it was satisfied and than shut down the burner. No over heating and hot & cold spots were eliminated.
For more info see the link below.
Comfort Calc
 
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