Gas Shut-Off Tap; Gas Flow Rate Controller; Injector - Main Burner - Valor 4190 Installer's Manual

13.10 To remove the shut-off tap(see figure 47)
13.10.1 Remove the burner unit - See section 13.8.
13.10.2 Turn the burner unit upside down. Detach the thermocouple
and interrupter block from the tap - See sections 13.7.2 to 13.7.4.
13.10.3 Detach the pilot pipe from the tap.
13.10.4 Detach the inlet pipe.
13.10.5 Remove the hexagonal nut securing the tap to the mounting
bracket.
13.10.6 Detach the elbow by unfastening the hexagonal nut connecting
it to the flow rate controller. Lift the tap (complete with elbow) clear
13.10.7 Loosen the hexagonal locknut securing the elbow to the tap.
Remove the elbow by rotating it.
13.10.8 If fitting a new tap, remove the hexagonal nut at the
mounting bracket end of the old tap and fit to the replacement tap.
Refit in the reverse order - NOTE - prior to refitting the elbow to
the shut-off tap, apply an approved sealant to the elbow thread. Refer
to figure 48 to ensure accurate refitting dimensions of the valves and
subsequently into the mounting bracket. When refitting, make sure
that the tap spindle is in the correct relationship relative to the
control pivot bracket. Rotate the pivot bracket fully clockwise. The
tap spindle should "bottom out" (i.e. the tap should be fully open)
after the pivot bracket has actuated the ignition microswitch but
before it has pushed the microswitch leaf against the microswitch
body.
When refitting the thermocouple and interrupter block, make sure
that the microswitch wires are properly secured to give a good
electrical contact.
See section 13. 3. 6 for refitting the surround.
13.11 To remove the gas flow rate controller (see figure 49)
13.11.1 Remove the burner unit - See 13.8.
13.11.2 Detach the microswitch cover - See section 15.1.2.
13.11.3 Detach the shut-off tap as detailed in sections 13.10.2 to 13.10.6
13.11.4 Detach the burner pipe from the controller. Support the controller
while detaching to prevent excessive strain.
13.11.5 Remove the nut and washer securing the control pivot bracket to
the controller at the front. Support the pivot bracket while removing the nut
to prevent possible damage to the microswitch.
13.11.6 Undo the screw securing the silencer box and remove the silencer
box.
13.11.7 Remove the hexagonal bolt securing the control pivot bracket to the
controller at the rear.
13.11.8 Detach the control pivot bracket.
13.11.9 Remove the hexagonal nut securing the controller to the
front mounting bracket and remove the flow rate controller.
13.11.10 Refit in the reverse order. See section 13. 3. 6 for refitting
the surround.
13.12 To remove the main burner injector (see figure 50)
13.12.1 Remove the burner unit - See section 13.8.
13.12.2 Disconnect the main burner pipe from the injector at the
venturi end. If necessary, loosen the pipe at the flow rate controller
end to swing the pipe clear of the injector.
13.12.3 Unscrew the injector from the rear support bracket.
13.12.4 Refit in the reverse order. See section 13. 3. 6 for refitting
the surround.
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Fig. 47 Shut-off tap (viewed from rear with
burner turned over)
Fig. 48 Refitting dimensions of valves into
mounting bracket
Fig 49 Flow rate controller
Fig. 50 Burner injector removal