39
®
Option 1.5 - Reset hours run (0 - 1)*
This option parameter allows the HOURS RUN display for all fuels to be reset to zero. To perform a
reset, set this option parameter to 1 and leave option set mode. When the burner begins to modulate,
the
HOURS RUN
display will be reset and the option parameter automatically returns back to 0.
Option 1.6 - servo-motor Display (0 - 3)
Option 2.0 - Gas pressure select (0 - 2)*
If an NX1020 gas pressure sensor is connected to the system, it is possible to select gas pressure
monitoring and/or gas valve proving using this option parameter.
Option 2.1 - Gas pressure sensor zero (0 - 999 mBar)*
This is the minimum gas pressure rating of the installed gas pressure sensor (in mBar).
Option 2.2 - Gas pressure sensor span (0 - 999 mBar)*
This is the gas pressure (above atmospheric) measured by the sensor (in mBar) at its maximum out-
put (range of sensor).
Option 2.3 - Gas pressure nominal (0 - 999 mBar)*
This is the nominal line pressure of the gas supply delivered to the burner (in mBar).
Option 2.4 - Gas pressure low limit (0 - 999 mBar)*
This is the minimum gas pressure (above atmospheric) permitted by the unit before a gas pressure
limit fault is given. For safety reasons, this value should not be set to more than 200mBar below the
nominal gas pressure.
Option 2.5 - Gas pressure high limit (0 - 999 mBar)*
This is the maximum gas pressure (above atmospheric) permitted by the unit before a gas pressure
limit fault is given. Ensure the value is set within the capability of the sensor if being used for an ‘S’
class application. (250 mBar for NX1020 sensor).
Option 2.6 - Test volume (0.0 - 99.9 liters)*
This must be set to the volume (in liters) of the test pipe section between the two safety valves,
including the volume in each valve on the test section side. Refer to “Valve Prove Test Sequence”
page 26.
0
xx.x°
Angular degrees to 1 decimal place.
1
xx°
Angular degrees, no decimal place.
2
xx.x%
Percentage to 1 decimal place.
3
xx%
Percentage, no decimal place.
0
Gas pressure input not used. The gas valve leak test is not performed and the gas pressure limit values are ignored.
1
NX1020 gas pressure sensor used. The unit monitors the gas pressure (including the gas pressure limits) if a gas profile
is selected but does not perform gas valve proving.
2
NX1020 gas pressure sensor used. The unit monitors the gas pressure (including the gas pressure limits) and performs
gas valve proving if a gas profile is selected.
