Reply To: Circulator pump in hot water central heating causes hum throughout hou

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#287775
SylvanLMP
Participant

Hey My good Friend and Mentor Harold,

If this gentleman goes through several pumps because of short cycling Why cant they install a weighted flow control valve to prevent the hot water from flowing when the circulator is off thus having the impeller moving with the stratification of the hot water molecules and causing a possible reverse impeller condition?

2nd thought is If they did use NON electric zone valves and put the circulator on constant run this system would balance out with the heat going exactly where need via valve build in controller / actuator pre set for each radiator

Another problem associated with premature pump failures especially on hydronics is the use of ferrous body/internal parts which cannot take fresh water and this system should be checked out for possible leaks allowing make up water to go undetected.

3rd Thought. Harold as we both know a lot of these older GREAT systems relied on a balancing valve for each zone sort of like a gas cock valve to control volume and suppose the balancing cocks are closed partially closed causing a high head (restriction) wouldn’t this also cause noise (velocity moving through this valve) AND premature pump failure?

Considering these pipes are well over sized do to the natural circulation of hot being lighter moves up and cold being heavier moves down. A balancing valve would have to have been adjusted to prevent over heating in some zones and under heating in others.

If this system was installed properly there should be a thermometer on the RETURN manifold for each zone (riser) just above the balancing valve and this set the volume / temperature for each section of the house

Another option would be to relocate the circulator to the discharge line rather then on the return where it was common practice to do years ago.

Hey Harold this is FUN dealing with a professional, thank you

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