Operating Instructions For TD/TAD4 Dual Fuel Burner
June 13 80 of 165 TD/TAD4 Manual Rev 4
(f) Re-assemble in reverse order, ensuring that a new gas head seal is fitted.
(g) Check the combustion head is correctly aligned in the blast tube and that the seal is gas
tight.
(h) Close and lock-up the burner
Burner Motor Replacement
(a) Disconnect the probe and ignition leads from the combustion head and withdraw them and,
where necessary the UV cell from the mounting casting.
(b) Disconnect air pressure switch and hinge switch cables. Ensuring that all cables are properly
marked for ease of re-connection.
(c) Ensure that the burner door locking nuts are fully tightened.
(d) Disconnect all mains power connections and other electrical wiring between the burner
panel and the boiler or other electrical panels again ensuring cables are marked.
(e) Disconnect the motor wiring at the panel end (ensure that all cables are identified and that
the wiring connections on the replacement motor are the same as on the original).
(f) Remove the air damper drive linkage.
(g) On the TD3, TD4 and TD5 burners it will be necessary to electrically disconnect the air
damper modulation motor.
(h) Take out the four fixing bolts and remove the modulation motor mounting bracket .
(i) Using suitable lifting gear take the weight of the burner by its lifting eye.
(j) Remove the ring of screws which secure the two halves of the fan case.
(k) Remove the rear half of the burner (half fan case, motor, fan, panel) and place on a bench or
clean floor area.
(l) Remove the fan retaining bolt from the end of the motor shaft and carefully remove the fan
taking care not to misplace the drive key.
(m) Remove the motor by releasing the four retaining bolts at the rear of the main air shutter
casting.
(n) Re-assemble in reverse order, ensuring that the motor shaft is properly greased before the
fan is fitted.
Gas Valve Actuator -Removal/Replacement
Removal of gas valve actuators must only be carried out by suitably qualified personnel. Full
details of removal/replacement procedures for all standard actuators fitted by Dunphy Combustion
are given in the 'Unibloc' section of this manual.
NOTE: THE FAN AND BOSS MUST BE
REMOVED COMPLETE AS A SINGLE UNIT
UND
ER NO CIRCUMSTANCES MUST THE
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