| 摘要 |
<p>1. A control system (11) for a control of a fuel valve (9) of a heater (1) for circulating water in accordance with a mark-to-space ratio and with a constant cycle time in dependence on the outdoor temperature (14), comprising means for effecting a flow temperature automatic control which is superimposed on said control, wherein the set point adjuster (16, 17) for said control and automatic control provides for said control and automatic control a signal which has been derived from the outdoor temperature and is adapted to be changed between different values for day and night, characterized in that the flow temperature is monitored by a limit signal generator (26, 27), the limit signal of which is additional variable in dependence on the outdoor temperature by means of a day-night change-over switch (37, 38, 21, 22).</p> |
