2 Expansion Options
04.09.2016 Mk8 MM Expansion Features Installation and Set-Up Guide Page 23
Exp
Option
Default Range Description
147 0 Fuel Pressure Sensor Enable
The fuel pressure sensor is wired to terminals 31, 32, 33 and 34. This
cannot be used with the mass flow meters for fully metered. The pressure
sensor can still be used for flame safeguard checking such as high/low
pressure limits and VPS.
0 Disabled
1 Enabled
148 0 Air Pressure Sensor Enable
The air pressure sensor is wired to terminals 31, 32, 33 and 34. This
cannot be used with the mass flow meters for fully metered. The pressure
sensor can still be used for flame safeguard checking such as high/low
pressure limits and VPS.
0 Disabled
1 Enabled
149 100 Maximum Fuel Channel Compensation
This is the maximum percentage of the fuel servomotor angle which the MM
will move towards the closed and open position to maintain the
commissioned firing rate (heat input). The fuel servomotor angle will never
exceed commissioned high fire position or go below the commissioned low
fire position.
0 – 100 0.0% - 10.0%
150 100 Maximum Air Channel Compensation
This is the maximum percentage of the air servomotor angle which the MM
will move towards the closed and open position to maintain the
commissioned fuel-air ratio. The air servomotor’s movement ranges from the
commissioned closed position to the commissioned open to close positions.
0 – 100 0.0% - 10.0%
151 0 Action on Air Adjustment Failure
If after the air 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 an air adjustment failure. For setting 1, the MM
generates a warning. For setting 2, the MM generates a warning and
disables the air adjustment and the air servomotor returns to the original
commissioned curve.
0 Generate alarm
1 Generate warning
2 Generate warning, disable air adjustment
152 0 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.
0 Generate alarm
1 Generate warning
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