8 Multi Burner Operation
Mk8 MM Manual Page | 153
8.5 Multi-Burner with EGA
8.5.1 Multi-Burner with Single EGA
The multi-burner function can be used in conjunction with an Exhaust Gas Analyser (EGA) to monitor and
trim emissions. When using the multi-burner function, it is possible to use only one EGA if the boiler has a
common stack and the burners are firing into the same combustion chamber. The following modules are
required:
• 2 or more Mk8 MMs for multi-burner application
• 1 x Mk8 EGA and sampling probe to measure the exhaust gases from the common stack
The EGA sampling probe is mounted in the stack, and the EGA communicates with the Master MM through
the data link on terminals 25 and 26. The EGA data is then transferred over to the Save MMs via the multi-
burner data link on terminals 23 and 24. In addition to the multi-burner options the following EGA options will
need to be set on the master only:
• Option 12 – EGA Operation
• Option 33 – MM Identification (Master MM ID must match EGA ID)
All burners need to be either fully commissioned simultaneously, with the points in the combustion curve
entered at the same point and at similar angular degrees to ensure that all burners are firing with good
emissions throughout the firing range. Alternatively, the systems can be commissioned independently with
option 12 set to 1 (EGA for monitoring only) and then set to 2 or 3 afterwards with trim values entered in
single point change on the master MM only. Once trim is commissioned on the Master MM, all burners will
modulate as normal and follow the trim as set in the Master MM.
Safety limits of combustion on EGA can also be used with multi-burner operation, allowing the user to set
absolute or offset limits of O
2
, CO, CO
2
, NO and exhaust temperature, on the Master MM only. Any
combustion limits alarms will operate as set in EGA option 13 on the Master MM. Please refer to the EGA
Setup Guide for more information on setting up combustion limits.
In critical situations where one of the MMs is in fault condition, single burner firing can be used. However, it is
recommended that the EGA is optioned to monitor only (Mk8 MM option 12 set to 1) or completely disabled
to ensure reliability. Provided no changes are made to the combustion either through re-commissioning, or
single point change, the EGA can be re-optioned when required.
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