Domestic hot water system
作者： Scheid Klaus , Thomas Rolf , Taag Juergen
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摘要: The hot water system has a boiler (1) with flow and return circuit. It an additional secondary circuit running from the fitted mixing valve, for purpose of temp. control incorporating radiator. A thermostat is on common to both circuits pipes lead it, circulation pump, valve outside thermostat. (4) falling below predetermined level periodically allows proceed.
lens.org 参考文章(1)
Pohla Heinz, Klein Heinz Dr Ing, Lennarz Klaus, Heating boiler controlled by external temp. - has additional regulator cutting out circulating pump at night ,(1980)