Operating Instructions For TD/TAD4 Dual Fuel Burner
June 13 74 of 165 TD/TAD4 Manual Rev 4
relation to the gap through which the air is passing, causing poor flame shape and
impingement on the furnace structure.
4. Where divergent ( expanded ) nose cones are used, the cone itself should be positioned
relative to the flame ring and allow an adequate volume of air for combustion, but at the
same time, give a velocity which is high enough to assist in shaping the flame to give
optimum combustion.
While the design of the combustion head is the major factor in obtaining maximum
combustion efficiency, careful setting of the various component parts is also important.
When a burner has been in service for a period long enough for its performance to be
confirmed and before the settings have been disturbed, the relative dimensions of the
combustion head components should be recorded, so that after dismantling for maintenance,
correct reassembly can be assured.
Set the high/low thermostat or pressure switch to a lower figure than the on/off control. The
difference should take account of demand, bringing the burner back to low fire early enough
to slow down any boiler pressure or temperature rise if the heat demand is less than the
boiler M.C.R. and reduce the on/off cycling of the burner. Equally the burner must revert to
its high fire rate in time to maintain the pressure or temperature above a figure which is
determined by site conditions.
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