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40.1 0 Draft Control - Enable:
0 Disable
1 Enable
40.2 1 Draft Control - Pressure Sensor:
1 0-1 PSI Pressure Sensor MM70005
40.3 15
Draft Control - Minimum Baffle Angle Limit: The smallest angle that the stack damper will drive to
during any stage of operation. This is not the closed 0.0 angular position entered during commissioning.
0 - 45 Degrees
40.4 5
Draft Control - Delay Before Compensation: The delay after the main flame is established before
draft control operation commences. This is also the time set for the deactivation window, where the M.M.
must not see a change of the value set in expansion option 40.5 in this time for the PI to stop modulation,
and carry forward trim operates.
5 - 30 Seconds
40.5 10
Draft Control - Firing Compensation Deactivation Window: If the offset from the
commissioned draft servo angle set in this option is breached over the time period set in expansion option
40.4 , PI stops modulations, and carry forward trim operates.
0 - 60 Degrees
40.6 1
Draft Control - Maximum Compensation: This is the maximum trim forwards or backwards which
the stack damper can move, during trim operation. If this is set to 10%, the stack damper can move to a
maximum of 10% of the commissioned draft servomotor position, backwards and forwards.
0 10%
1 15%
2 20%
40.7 0
Action on Pressure Sensor Failure: This sets whether the burner will lockout or the stack damper
will go to its commissioned positions along the curve, should the draft air pressure sensor fail.
0Lockout
1 Revert to commissioned curve
40.8 0
Pressure Tolerance Before Fault: This is the maximum allowable pressure change from commissioned
draft air pressure values over 2 minutes before an error message is displayed on the screen.
0 - 50 PSI (0.0 - 5.0 Bar)
41.1 200 Draft Control P Multiplier
The P Multiplier % is used to calculate the P Value; the P value is used together with the I Value calculated
from expansion option 41.2 to give a PI Total which determines the angle the draft servomotor moves to,
during trim operation. The P value is the product of the present offset from the commissioned pressure
(pressure error) and the P Multiplier %. Larger P Multipliers cause a larger movment in the damper for a given
pressure. Too large a P Multiplier can cause the system to overreact to small changes in the system.
1 - 10,000 % (0.01) of Pressure Sensor Range e.g. 200 = 2.00%
41.2 5 Draft Control I Multiplier
The calculated P Value (pressure error multiplied by the P Multiplier%) is multiplied by the I Multiplier %
to give the I Value. This I Value is added to a running total of I Values. The amount of damper movement
is controlled by the sum of the most recent P Value and the running total of I Values. The running total of
I Values is updated every 'n' seconds (set in expansion option 41.3). As the pressure approaches the
commissioned value the P Value becomes progressively smaller, resulting in smaller changes to the I Total.
1 - 250 % (0.01) e.g. 5 = 5.00%
41.3 5
Draft Control I Timer: This is the time between each I value update.
1 - 30 Seconds
41.4 15
Draft Pressure Filter Time: The draft pressure filter time filters the pressure readings over this time set
this option. Increase this value to remove excessive fluctuation in draft pressure reading. Decrease this
value to improve the pressure sensor's responsiveness.
1 - 60 Seconds
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