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There's water hammer near the end of the heating cycle

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Published
July 10, 2009 Subscribe to RSS feed

The Hartford Loop isn't piped properly.
Make sure the connection between the return and the equalizer is far enough below the boiler's water line. If steam can work it's way down the equalizer and into the wet return it will hammer, and usually at the end of the cycle.
See if there's a long nipple on the Hartford Loop. Long nipples create water hammer as the condensate returns. Replace the long nipple with either a close nipple or a wye fitting.