17 Fully Metered Combustion Control
Mk8 MM Manual Page | 298
# Default Range Description
FM: Action on Flow Meter Failure
If one of the flow meters loses communications with the MM or has a fault,
the MM can either generate alarm and lockout the burner, or generate the
warning and
revert to the commissioned curve with no fuel and air
servomotor trim adjustments.
FM: Default absolute ambient air pressure
The default ambient air pressure must be set when using volume flow
meters, to derive the mass flow rate used to calculate the fuel-air ratio.
mbar (341.1 – 441.5 “ WG)
The fuel density must be set when using volume flow meters, to derive the
mass flow rate used to calculate fuel-air ratio. This is at 1013mbar, 15
0
C
O
0.656 kg/m
3
at 1013mbar, 15
0
C (0.041 lb/ft
3
)
0.001 – 10.0 kg/m
3
(0.00006 lb/ft
3
– 0.625 lb/ft
3
)
The fuel density must be set when using volume flow meters, to derive the
mass flow rate used to calculate fuel-air ratio. This is at 1013mbar, 15
0
C
O
0.656 kg/m
3
at 1013mbar, 15
0
C (0.041 lb/ft
3
)
0.001 – 10.0 kg/m
3
(0.00006 lb/ft
3
– 0.625 lb/ft
3
)
The fuel density must be set when using volume flow meters, to derive the
mass flow rate used to calculate fuel-air ratio. This is at 1013mbar, 15
0
C
O
0.656 kg/m
3
at 1013mbar, 15
0
C (0.041 lb/ft
3
)
0.001 – 10.0 kg/m
3
(0.00006 lb/ft
3
– 0.625 lb/ft
3
)
The fuel density must be set when using volume flow meters, to derive the
mass flow rate used to calculate fuel-air ratio. This is at 1013mbar, 15
0
C
O
0.656 kg/m
3
at 1013mbar, 15
0
C (0.041 lb/ft
3
)
0.001 – 10.0 kg/m
3
(0.00006 lb/ft
3
– 0.625 lb/ft
3
)
FM: Action on Fuel Adjustment Failure
If after the fuel servomotor has made adjustments to compensate for the
changes in the flow rate, and the fuel-air ratio cannot still be met, an alarm
or warning will occur. For setting 0, the MM generates an alarm and will
lockout the burner upon on a fuel adjustment failure. For setting 1, the MM
generates a warning. For setting 2, the MM generates a warning and
disables the fuel adjustment and the fuel servomotor returns to the original
Generate Warning, Disable Fuel Adjustment