| 摘要 |
<p>This control system is designed for use with gas or oil-fired central heating boilers. The following variables are monitored by transducers: water temp., room temp., fan speed, air flow and selected room temp. The transducer outputs are fed to a central electronic processor which controls the fuel flow by means of a series of valves, and the air flow by fan motor control. The processor also switches off the fuel supply if faults are indicated by switches which operate in the following conditions: water pressure low, water temp. high, flame out, no oxygen in air. There is also a timer, a digital temp. display, pressure regulator and electric ignition.</p> |
