| 摘要 |
The boiler control system controls a heating device in a boiler 1, such as a burner 2. A delayed cycle controller 20 activates and deactivates the burner based upon an upper target temperature and a lower target temperature, which are ideally set 3ËšC below respective internal upper and lower temperature thresholds of an internal thermostat of the boiler. A temperature sensor 22 measures a boiler temperature and can compare this with the upper and lower target temperatures. An interrupt switch, ideally a relay 28, is arranged to selectively prevent an enable signal 26 from reaching the burner. Preferably the enable signal is from a building management system (BMS) 24 and is barred from reaching the burner by the relay until the boiler temperature measured by the sensor falls to the lower target temperature. The lower target allows residual heat in the boiler to be used before the burner is fired, increasing boiler efficiency. The system may perform a calibration operation whereby the controller monitors normal boiler operation to determine the internal upper and lower temperature thresholds. Using these, the controller can set the upper and lower target temperatures. A method is also claimed. |
