Decoupler on HHW System

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Gunnerdad Participant Join Date: Jan 2016 Posts: 1	Decoupler on HHW System 01/11/2016 3:33 PM
	I've used decouplers on large HVAC systems in the past, but I am having an issue with one installed on a smaller HHW system. When the second boiler comes on line the supply temperature to the boilers rises to the level that shuts off the boilers. I suspect that my boiler pump pressure is over-riding my return pressure from the main HHW pump and short cycling too much hot water. Does this seem like a reasonable assertion or am I missing something?
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SolarEagle Guru Join Date: Mar 2007 Location: by the beach in Florida Posts: 33392 Good Answers: 1817	#1 Re: Decoupler 01/11/2016 3:52 PM
	I would need a detailed drawing with temps and pressures to make a guess...It's been my experience that when a system is malfunctioning that there has been a lack of maintenance though....does that sound reasonable? __________________ All living things seek to control their own destiny....this is the purpose of life
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Codemaster Guru Join Date: Jul 2005 Location: Stoke-on-Trent, UK Posts: 4496 Good Answers: 137	#2 Re: Decoupler on HHW System 01/12/2016 4:47 AM
	It depends on the locations of the pumps and temperature switches (as SE says) and details of how it's controlled. Is "the supply temperature to the boilers" sensed by a switch in the common return pipe? __________________ Give masochists a fair crack of the whip
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