Control apparatus for central heating systems

摘要

Control apparatus for a central heating system includes one or more thermistors 25-28 sensing the temperature in a space heated by the system; a digital processor 1 stores a set value of temperature required in the space during an operating period of the system and derives a digital temperature signal representing the temperature sensed by the thermistor. The processor controls the supply of heat during the operating period to maintain the temperature in the space at the set value. The processor includes a data memory 2 for storing set values of temperature for several heating zones and for hot water, and a programming memory 4. Set values of time and temperature are put in using a keyboard 7 and display 8. A clock 5 provides signals for the processor and for a current time and day register 6. The processor outputs control a boiler 34 and pump 35 and one or more zone valves 36.