Operating Instructions For TD/TAD4 Dual Fuel Burner
June 13 75 of 165 TD/TAD4 Manual Rev 4
7.6 Electronic Modulating Burners
7.6.1 Gas Butterfly Valve
Control of the gas supply to the burner is performed using a butterfly valve.
material specification of blade and spindle can be altered depending on gas
type, E.G. Stainless Steel can be specified for Bio-gas.
Check the butterfly valve has been correctly set to zero - Please consult
manual for details. More details on the butterfly valve can be found in the
component section.
7.6.2 Oil Metering Valve
The oil metering valve is used to control the amount of oil returning from the
spill back oil nozzle line. On spill back systems, the witness mark on the
inner spool piece must be set to 'B'.
Set the pointer to zero - Please consult manual for details. With the pointer set to zero, this
represents maximum flow through the metering valve. As the valve modulates up to 90º, the valve
closes off, also closing off the return spill line from the oil nozzle line and
therefore increasing the firing rate. More details on the oil metering valve can be
found in the component section.
7.6.3 Adjustment of air pressure proving switch
Check the air pressure proving switch and, if necessary, set to 50% of
differential pressure.
Example of adjustment:-
Negative pressure ( – ) measured 4 mbar
Positive pressure ( + ) measured 5 mbar
Differential pressure is - 9 mbar
Switch off point of pressure switch is 4.5mbar
From this point all commissioning procedures are dictated by the Ratiotronic 6000 manual.
ALWAYS CHECK THE COMBUSTION READINGS AFTER MAKING ADJUSTMENTS
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