63
®
Option 30.6 - Oxygen probe calibrate enable (0 – 2)
This option parameter is only available if option 30.0 is set to
1
and an FMI board is installed in
option slot 2.
This option parameter must be used when calibrating the FIREYE oxygen probe. There are three
possible values:
0
- No calibrate. This is the normal operating condition, where the probe is used to
measure the oxygen concentration in the flue.
1
- Calibrate in air. The probe will be calibrated for "offset" at the normal atmospheric
oxygen concentration.
2
- Calibrate in reference gas. The probe will be calibrated for "gain" in a reference gas
with a nominal oxygen concentration of 3.0%.
Once this calibration has been successfully completed the values in 30.1 and 30.2 will be automati-
cally updated.
Option 30.7 - Boiler transport delay (5 – 60 seconds)*
This parameter is only available if option 30.5 has been set for closed loop oxygen trim.
Boiler transport delay is the time taken for "gas" to travel from the burner to the oxygen probe. This
delay varies with burner fire rate.
In order for the oxygen trim control loop to be stable, this parameter must be set accurately to the
transport delay of the boiler when at low fire. This option may be set between 5 and 60 seconds
inclusive.
•
To measure the transport delay, ignite the burner and enter adjust ratio mode. Select the low fire
setpoint and allow time for the flue oxygen reading to settle. Once the oxygen reading is steady,
make a step change to the fuel/air ratio and start a timer. As soon as the measured oxygen read-
ing begins to change, stop the timer. Set the option parameter to the recorded timer value in sec-
onds.
•
Automatic trim commissioning (option 30.9) will set this automatically. However the value
must be checked by the engineer.
Option 30.8 - Reset oxygen trim profile (0/1).
This option parameter allows the learned trim profile to be reset. If the option is set to 1 any learn
profile currently held in memory will be reset and the trim drives will return to their commissioned
positions for the corresponding modulation position. Once the profile has been reset this option
parameter will automatically be reset to 0.
Option 30.9 – Automatic trim commissioning (0 / 1)*
0
- Not selected.
1
- Automatic trim commissioning will be performed under the following conditions:
•
An oxygen probe is fitted and fully operational
•
The unit is in adjust ratio with the burner firing a single fuel only
•
A hydrocarbon ratio has been entered for the current fuel (see option parameters 36.4 – 36.6).
Option 32.0 - Trim drive default (0/2)*
Options 32.1 to 32.7 - Trim drive select (0/1)*
Option 32.0 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 perform oxygen trim control either by adjusting the positions of the
fuel drives or the positions of two air drives (AIR DAMPER 1 and AIR DAMPER 2). The system
never applies oxygen trim to AIR DAMPER 3 or 4 or OPTION 1 - 6.
If option 32.0 is set to 0, the system will default to trimming the AIR DAMPER 1 and AIR
DAMPER 2 for all profile combinations. Option parameters 32.1 to 32.7 will not be available.
