13 Draught Control
Mk8 MM Manual Page | 240
Figure 13.1.ii Autoflame Draught Control
After commissioning is completed, every fuel and air position will have a stack damper position together with
a stored draft pressure. The stack pressure is controlled by air pressure sensor, stack damper and PI loop.
When the system is in run mode the stack damper will be positioned according to the stored commissioning
pressure. If the stack pressure reading measured by the differential air pressure sensor reads a different
condition to the stored value, then the stack damper butterfly valve will be adjusted to ensure that the stack
pressure is brought back to its commissioned value.