Operating Instructions For TD/TAD4 Dual Fuel Burner
June 13 48 of 165 TD/TAD4 Manual Rev 4
4.3.5 Oil Operating System Modulating Burners Multi-Oil Nozzles
Atomisation of the oil is by means of three nozzles which work on the spill-back principle. The
nozzle fits into the hydraulic nozzle line assemblies that allow oil from the pump outlet to circulate
through the nozzles and back through the metering valves to the pump return when the burner is
ready to fire, two PDV N/C solenoid valves open allowing oil to flow through the nozzles. The
return path from the centre nozzle flows through metering valve MV1, while the three outer nozzle
flows through MV2, they then join a common oil line, passing through two N/C safety shut off
valves, and back to the return of the pump.
The oil volume is controlled by the metering valves (MV1 and MV2) in the spill line restricting the
amount of spilled oil and therefore increasing the volume that passes through the nozzle for
combustion.
Control of both metering valves and the air shutter is achieved by means of independent servo
motors which are positioned by the electronic control system.
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