62
Option 25.6 - Standby high limit control value (0 - 999 / 00.0 - 99.9 / 0.00 - 9.99)
If the unit is placed in standby mode by boiler sequence control, the boiler's pressure is maintained
between these two limit values by firing up at low fire when the low limit is transgressed, and
switching off when the high limit is attained.
Option 25.7 – Sequencing delay time (5 – 15 minutes)*
This is the minimum time between turning a boiler on or off when in boiler sequencing mode. If it is
too long, it may take too much time for a boiler to respond to the steam demand. If too short, boilers
may be turned on unnecessarily.
Option 30.0 – Oxygen probe select (0 – 2)*
This option parameter is only available if an FMI board is fitted in option slot 2.
0
- No probe selected. The oxygen level display will not be available.
1
- FIREYE oxygen probe for monitoring or trim with no pre-purge test.
2
- FIREYE oxygen probe for monitoring or trim with a pre-purge test. If the measured
oxygen level is less than 18.0% at the end of the pre-purge period, F76 is given and
oxygen trim will be disabled.
Option 30.1 - Oxygen probe calibration offset value (0 – 999)*
This option parameter is only available if option 30.0 is set to
1
and an FMI board is installed in slot
2.
This option parameter must be set to the calibration offset value which is specified with the probe
supplied.
Option 30.2 - Oxygen probe calibration gain value (0 – 999)*
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 set to the calibration gain value which is specified with the probe sup-
plied.
Option 30.3 - Oxygen probe calibration gas concentration (0.00 – 9.99%)
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 set to the percentage oxygen concentration of the cali-
bration gas used if the probe is to be calibrated using a reference gas (see option parameter 30.6). The
range of this parameter is 0.00 - 9.99%.
Option 30.4 - Oxygen probe calibration resistance value (0 – 999)*
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 set to the calibration resistance value specified for the supplied probe.
Option 30.5 - Oxygen input function (0/1)
This option parameter is only available if option 30.0 is not set to zero and an FMI board is installed
in option slot 2.
Using this option parameter, it is possible to configure the system to use the oxygen input for a mon-
itoring function or trim function. The two functions are explained below:
0
- Monitor only. The oxygen input on the FMI board is only used to provide a display
of the measured oxygen level.
1
- Closed loop trim. The oxygen input on the FMI board is used to provide both a
display of the measured oxygen level and a feedback signal for closed loop trim control
of the fuel/air ratio.
