We have a wood boiler connected to our boiler for the house. We are having a problem understanding the terminology on the paperwork for the aquastat we purchased and think we may not have the right product for what we want to accomplish.

This is what we are trying to do. The aquastat must send a message to the zone valve to open at a high temp say 180 deg.) to start the circulator, so the hot water can move to a zone if the water gets too hot in the wood boiler.

The aquastat we purchased says on the inside of the cover the following. "Switch closes on temp increase." However it never triggers the zone until the water reaches 240 deg. It closes the zone at 140 deg. Can you help us understand this situation?

Thank you

Where is the temperature probe located for the aquastat? Does it go into the heater core or does it just stap on the supply piping, quite often theses are adjustable. Also there should be 2 other safeties that close dampers or turn on the pump before 240 degrees. I know very little of wood burning boilers but I do know you don't want the temperature over 212 degrees at which point it turns to steam, a little higher because it is under pressure but still, I think that is dangerous.

The aquastat is in a well above the wood boiler in the water line.

We have damper controls by temp control, they work fine. It's the aquastat that is susposed to open the zone valve before it gets too hot. It doesn't

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Originally Posted by NorthernHeat

Where is the temperature probe located for the aquastat? Does it go into the heater core or does it just stap on the supply piping, quite often theses are adjustable. Also there should be 2 other safeties that close dampers or turn on the pump before 240 degrees. I know very little of wood burning boilers but I do know you don't want the temperature over 212 degrees at which point it turns to steam, a little higher because it is under pressure but still, I think that is dangerous.

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Sorry I'm just not that familiar with wood burners

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Originally Posted by LindaM

The aquastat is in a well above the wood boiler in the water line.

We have damper controls by temp control, they work fine. It's the aquastat that is susposed to open the zone valve before it gets too hot. It doesn't

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may be there is not enough water ( the well should contact the water, is there some kind of thermal jell come with the sensor) or it is defect, is there a differential setting?. your water temp should not go beyond 200... the safety relief valve should blow off at 212 or lower

Thanks for your suggestions, I have a guy I work with who has the same kind of system in his house. He will be taking care of our problem soon. Thanks again.