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Central heating controller (1):


Central heating controller (1):
Most householders these days employ timeswitches to control their central heating systems. Many of these switches, however, are of the mechanical type, with a limited number of switching steps, and with no facilities to vary the program from one day to the next. It is only fairly recently that electronic controllers have appeared on the scene, and the one described here is designed to give a wide range of programming options, which can easily be changed.
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