dunphy TAD4, Operating Manual

Page: 43 / 165

Operating Instructions For TD/TAD4 Dual Fuel Burner
June 13 43 of 165 TD/TAD4 Manual Rev 4
4.3.1 Oil Operating System Modulating Burners ART 114 and ART 1400 Nozzles
Atomisation of the oil is by means of a single nozzle which works on the spill-back principle. The
nozzle fits into a hydraulic nozzle line assembly that allows oil from the pump outlet to circulate
through the nozzle and back through the metering valve to the pump return when the burner is
ready to fire, N.C. solenoid valves 4 & 5 open allowing oil to flow through the nozzle. the return
path from the nozzle line flows through a metering valve and back to the return of the pump
through a safety shut off valve.
The oil volume is controlled by a metering valve 6, 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 the metering valve and the air shutter is achieved by means of independent servo
motors which are positioned by the electronic control system.
Key
1) Nozzle Line Assembly
2) Nozzle
3) Oil Pump (Dunphy)
4) Pump Discharge Valve - Normally Closed
5) Pump Discharge Valve - Normally Closed
6) Oil Metering Valve (Dunphy)
7) Pressure Gauge - 0-40 Bar
8) Gauge Clock
9) Non - Return Valve
10) Test Point
11) Flexible Oil Line (Supplied Loose)
12) Low Oil Pressure Switch (Optional)
13) High Oil Pressure Switch
14) Manual Isolation Valve with Switch Packs (when fitted), interlocked with oil select on
burner.