4 Fuel Output Modes and Changeover Options
Mk8 MM Manual Page | 107
4.2 Fuel Output Modes on the Mk8 MM
Option / Parameter 131 (Fuel Valve Output Configuration) allows multi-fuels to be configured in 2 different
ways on the Mk8 MM:
1) Single Fuel Output Mode (SFOM) – One Set of Fuel Outputs
This is the standard (default) mode, it allows the configuration and commissioning of up to 4 different fuels
using single set of outputs on the MM, switching between fuels is possible through the use of changeover
relays.
2.a) Dual Fuel Output Mode (DFOM) – Two Sets of Fuel Outputs
Available as standard, it allows 2 fuels to be configured and commissioned using 2 separate sets of fuel
outputs on the MM (2 main valves and one vent valve) and inputs (Proof of closure/ CPI). No changeover
relays are required to change between fuels in DFOM.
2.b) Dual Fuel Output Mode with Change on the Fly (DFOM-COF)
This mode operates in the same way as Dual Fuel Output Mode but also allows switching between fuels
while the burner is firing.
When COF is enabled and fuel select is triggered while the burner is firing, the burner simply modulates to
low fire. The air damper angle is increased to allow extra air for both fuels to fire at the same time, and the
second fuel is introduced so both fuels fire simultaneously for a short period of time. The first fuel is then
turned off and the burner modulates up to the required firing rate without turning off the burner. The MM still
runs through all the standard safety checks.
The Changeover on the Fly is an unlockable feature that requires the purchase of unlock code (COF) before
it can be optioned, this can be uploaded to the MM via IR Lead using Autoflame Download Manager
software (version 8.13 and above). COF is available only on Revision 4 of the Mk8 MM, for more information
please contact Autoflame.
The fuel curves must be commissioned according to the optioned fuel output mode, so if Single Fuel Output
Mode is optioned the fuels must be commissioned in Single Fuel Output Mode, changing the fuel valve
output mode requires recommissioning of any fuel used in that mode.
Fuel valve output configuration
One set of outputs (changeover relays, 4 fuels)
Two sets of outputs (no changeover relays, 2 fuels) - Default
Two sets of outputs, change on the fly (COF)*
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