| 摘要 |
Heating control apparatus comprises a control unit 10 in electric circuit with one or more operating controls 12 of two heat sources, namely a boiler or a back boiler, which produce a heated medium. if only one heat source is used, valves isolate the other. Ambient temperature thermostats 16 govern heat emission from radiators. Pumps 18, 20 circulate the heated medium from the sources to the radiators. Hot water is supplied using cylinder thermostat 26; if only hot water is required the radiators are isolated. Frost detecting thermostat 14 is provided on pipes of a tank in an unheated room and acts to operate the boiler if freezing is imminent. <IMAGE> |
