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Banging Zone Valves ... (5 Posts)
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Banging Zone Valves ...
I installed a Grundfos Alpha pump with three Honeywell zone vales in the secondary loop instead of three separate circulators since this new technology will lower the electric usage.
The complaint now is banging zone valves. I remember reading an article on this a while back. My guess is there are two zones calling and when one shuts down we get the bang. Has anyone come up with a way to solve this problem?
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Bang bang
The only time I have heard a band when the ball valve closed was when they were installed backwards. The zone valves have an arrow on them, check the orientation is correct.
Regards
Jeffrey
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Flow direction
The flow direction is correct.
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Alpha
Those Alphas move more water on auto that the three speeds do on low. Like twice as much. That could be your issue. If it bangs when set on low, try removing one of the return springs on the zone valves.
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problem solved!
I finally was in front of the equipment when we had the bang. The problem was a sticking micro switch on one of the zone valves. We had the bang and the circulator was still on on. I noticed the current Honeywell ZV seem to have the switch positioned so it breaks long before the valve closes avoiding any dead heading. This one closed and after tapping it the circ shut down.
I do like the new Alpha pump with the ZV. The power draw is very low.
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