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Old 12-22-2010, 05:35 PM   #16
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hydronic boiler bang?


here is a picture of the valves cap on and cap off--are they spring type?
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Old 12-22-2010, 05:49 PM   #17
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hydronic boiler bang?


Well there is good news and bad news at least the way it should have been done in the first place.

You did install the pump correctly for the system you have, the problem I see is the pump should be on the other side down stream of the expansion tank.

Not that it won't work the way you have it, it just won't work as well.

If you power up the (3) solenoid valves (zone valves) in the picture with an external source (if they are normally closed valves) and run the system you will avoid the water hammer (this is just a diagnostic suggestion). Caution valve are probably 12Volts (door bell transformer)

If that is the problem, then you can either

1 - move the pump
2 -change out solenoid valves for asco slow closing valves
3 - develop a "delay off" circuit for the solenoid valves.
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Last edited by Jackofall1; 12-22-2010 at 06:01 PM.
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Old 12-22-2010, 06:06 PM   #18
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hydronic boiler bang?


Thanks again for the reply. I heard that the pump should be on the other side. So why did the valves suddenly create a water hammer effect? The system worked fine with the exact same set up last winter and this winter before I changed the circulation pump. I trust you, I'm just don't understand why I can't make it work now if it worked with this setup before. Any thoughts?
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Old 12-22-2010, 07:15 PM   #19
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hydronic boiler bang?


Chances are the pump you replaced was not developing the pressure and flow that you are now getting with the new one. With the increased flow the problems would be magnified.

A delay circuit would not be that hard to do and it would certainly take care of the problem.

I am wondering what the previous owner had to do to stop the pressure relief valve on the boiler from releasing as you are definately on the pressure side of the pump.
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