| 摘要 |
A control circuit for switching on heating or air-conditioning apparatus comprises a computer (10) which is supplied with a signal (U1) depending on the difference between a desired value Xk and actual room temperature tr a signal (U2) depending on measured outside temperature ta and possibly a supplementary signal (U3). The signal (U3) serves for an additional advance of the moment of switching on after a switched off period of more than 24 hours and is added to the signal (U1) in an addition network (12). Also supplied to the computer (10) are signal S+, S- from two control elements (14, 16). At these two control elements (14, 16), a heating-up gradient S (Figures 2 and 3) is set up and is adapted to characteristics of the heating apparatus and building. The resulting output signal U4 from the computer 10 is compared in a comparator 36 with a rising ramp voltage U5 derived by a D/A converter from timing pulses. As soon as U5 reaches U4 the heating apparatus is switched ON at maximum output precisely at moment 74 (Figure 3). <IMAGE> |
