8 Multi Burner Operation
Mk8 MM Manual Page | 151
8.3.2 Independent on Fault
This operation mode is most suitable for water-tube boiler with multi-burners and can be selected by setting
option 43 to 2; all MMs can fire simultaneously and independently.
The Slave MMs will always take their firing rate from the Master MM, including when the Master MM has
been put in low flame hold or hand mode, apart from when the master is not firing or is in a lockout state. If
the Master MM is powered off, has an error or multi-burner communications loss, all burners will shut down.
If a Slave MM is powered off, has an error, lockout or multi-burner communications loss, then the other MMs
will continue to fire independently. When the Master MM is powered back on, the error is reset or the multi-
burner communications is recovered, all burners will then start-up in sync and resume firing in multi-burner
operation. When a Slave MM is powered up, the error, lockout or multi-burner communications recovered, it
will restart and resume multi-burner operation.
When Multi-Burner operation setup is set as Independent on Fault, a load detector must be wired to the
Master MM as well as all Salve MMs.
For hand and low flame hold modes, inputs can be wired to terminals 94 and 95 on all MMs. When the
Master MM is put into low flame hold or hand mode, all Slave MMs will follow the Master MM. If a Slave MM
is put into hand or low flame hold mode, the burner will continue to follow the Master MM.
When multi-burner MMs are setup as independent, each individual MM will go into hand or low flame hold if
the input is active on its terminals 94 and 95, respectively.
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