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Manifold failure - cause and effect

June 20, 2016

As with any complex system comprising of numerous parts - some individual components are relatively unknown. A good example of this is the humble manifold chamber - an essential but low profile part of a ground source system (they are usually buried in the ground!)


 A manifold chamber takes all of the pipes carrying the heat from the ground (usually 6 ports, but can be as many as 20 ) and converts them to two larger header pipes which go on to the heat pump itself.


Recently we were called out by one of our ground source clients to check on a heating system  which was malfunctioning.  We have a service contract on this system which was originally installed by another company. Various checks revealed that the glycol heat exchanger fluid was dangerously low, with a possible leak inside the manifold chamber.  It then became clear that a joint in the pipework inside the chamber had failed due to significant corrosion (see photos below).