8 Multi Burner Operation
Mk8 MM Manual Page | 150
8.3 Multi-Burner Operation Options
Multi-Burner function can be configured in 2 different ways as set in option 43; fully linked or independent on
fault.
8.3.1 Fully Linked Operation
This operation mode is most common in multi-burner fire-tube boiler applications. Fully linked operation can
be selected by setting option 43 to 1, in this case all MMs will fire simultaneously, the Slave MM(s) will
always take the firing rate from the Master MM, including when the master has been put in low flame hold or
hand mode. All MMs will start-up together and phases are checked for multi-burner sync – position to purge,
position to start, ignition and modulation.
All burners will always fire simultaneously; the internal stat of all MMs will open if any one of the MMs is shut
down by an external stat.
If a lockout or error occurs on one of the MMs, then all burners will turn off, until the lockout/error has been
reset, all MMs will proceed to start-up and fire simultaneously
A load detector does not need to be wired to the slave MMs, only the master MM. The load detector input on
the slave MMs can be left open circuit.
For hand and low flame hold modes, the inputs must be wired to terminals 94 and 95 respectively on the
Master MM, no inputs are required on the Slave MMs for Hand Mode or Low Flame-Hold modes.
For sequencing with multi-burner, the Master MMs can be connected via terminals 27 and 28 in a daisy-
chain configuration. Option 16 should be set to 1 or 3 on all master MMs. If all the MMs are connected to a
DTI, then they should all be connected be via terminals 27 and 28 in a daisy chain configuration, including
the slave MMs, Option 16 should be set to 0 on all slave MMs. This would allow the DTI to gather information
from all the MMs in the loop. The lead boiler switch should only be wired to terminal 88 on the Master MMs.
If there is a loss of communications between the MMs, all of them will open their internal stat and a ‘multi-
burner communications fault’ alarm will occur. They will all shut down and only start once all are
communicating via the multi-burner link.
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