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If option 32.0 is set to 1, the system will default to trimming the selected fuel drives for all profile
selections. Option parameters 32.1 to 32.7 will not be available.
If option 32.0 is set to 2, it is possible to select the trim drive individually for each profile combina-
tion using option parameters 32.1 to 32.7. These options may be set to one of two possible values:
0
- Trim on AIR DAMPER 1 and AIR DAMPER 2
1
- Trim on selected fuel drives
Option 33.0 - Trim limit default (0/1)*
Options 33.1 to 33.7 - Trim limits (0.0 – 25.0)*
Option 33.0 is only available if option 30.5 (oxygen input function) has been set for closed loop
oxygen trim.
It is possible for the system to trim the air or fuel drives up to a maximum deviation of ±25.0% of the
total air or fuel flow for the chosen trim drives.
If option 33.0 is set to 0, the default trim limit will be ±5.0% for all profile selections. Option param-
eters 33.1 to 33.7 will not be available.
If option 33.0 is set to 1, it is possible to individually adjust the trim limit for each profile selection
using option parameters 33.1 to 33.7. The trim limit may be adjusted from 0.0% (no trim) up to a
maximum of ±25.0% (maximum allowable trim).
Options 34.1 to 34.7 - Trim integral gain (0.0 – 99.9%)*
Options 34.1 to 34.7 are only available if option 30.5 (oxygen input function) has been set for
closed loop oxygen trim.
In order for the oxygen trim control loop to be stable, the integral gain must be set correctly. Options
34.1 to 34.7 allow the integral gain to be set individually for each profile combination to any value
between 0.0 and 99.9%. As a general recommendation, the integral gain should be initially set to
15.0%.
If the burner is firing, it is only possible to make an adjustment to the option parameter which relates
to the selected profile. If the burner is not firing, the integral gain for any profile selection may be
adjusted.
Option 35.0 - Trim proportional gain default (0/1)*
Options 35.1 to 35.7 - Trim proportional gain (0.0 – 99.9%)*
Options 35.0 to 35.7 are only available if option 30.5 (oxygen input function) has been set for
closed loop oxygen trim.
If oxygen trim proportional gain is not required for any profile selection, set option parameter 35.0 to
0.
If oxygen trim proportional gain is required, set option parameter 35.0 to 1. Option parameters 35.1
to 35.7 will then become available. Options 35.1 to 35.7 allow the loop gain to be set individually for
each profile selection to any value between 0.0 and 99.9%.
Option 36.0 – Inlet temperature sensor (0 – 2)*
This option parameter is only available if option 30.0 (oxygen input select) is not set to zero. The
option may be set to one of four possible values:
0 - Inlet temperature sensor not fitted.
1 - Inlet temperature sensor fitted and connected to PN1-2. Calculated burner gross effi-
ciency will be displayed if the calorific value, hydrocarbon ratio and flow values have been entered
for the fuel that is firing. Efficiency will not be displayed when firing multiple fuel combinations.
2 - Inlet temperature sensor fitted and connected to PN1-2. Calculated burner net effi-
ciency will be displayed if the calorific value, hydrocarbon ratio and flow values have been entered
for the fuel that is firing. Efficiency will not be displayed when firing multiple fuel combinations.
