3 Commissioning Procedure
Mk8 MM Manual Page | 96
3.6 Gas/ Air Pressure Commission
To commission the gas pressure sensor, go to Commission Mode and press . The MM will
then run through the points to store the gas pressure values.
If the VPS is optioned on, the unit will run through this valve proving process. The MM will go from Low Fire
to High Fire and store the gas pressure values along the curve. Once these values are stored, the upper and
lower offset limits will be adjusted to the new commissioned gas pressure values.
If the burner turns off during the gas/air pressure commission, the gas/air pressure commission process will
be restarted. This ensures that the MM does not run with an incomplete set of gas/air pressure readings.
Figure 3.6.i Gas Sensor
To commission the air pressure sensor, in Commission Mode screen press . The air pressure
sensor commission procedure is the same as the gas pressure sensor commission procedure. The same
procedure also applies for commissioning the oil pressure sensor.
Note: If the gas or air pressure sensor is replaced with the same sensor type (same pressure range) then
the sensor will not need to be recommissioned.
Note: For applications where VPS is required after burner shutdown only, the option/parameter 129 should
be set to 0 when doing the first gas sensor commission on the system to store the valve proving gas
pressure. During normal running, option/parameter 129 can be set to 1.
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