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. 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.
17.12 To remove the gas flow rate controller.
(See figure 58).
1. Remove the burner unit (See section
17.7).
2. If lying the burner on its back, ensure
that the work surface is suitably
protected. This will avoid damage to the
work surface.
3. Detach the microswitch cover (See
section 17.2 paragraph 2).
4. Detach the shut-off tap as detailed in
section 17.11 paragraphs 2-6.
5. Detach the burner pipe from the
controller. Support the controller while
detaching to prevent excessive strain.
6. 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.
7. Remove the hexagonal bolt securing the control pivot bracket to the controller at
the rear.
8. Detach the control pivot bracket.
9. Remove the hexagonal nut securing the controller to the front mounting bracket
and remove the flow rate controller.
10. Refit in the reverse order.
© GDC Group Ltd. 2011
Page 46
INSTALLER GUIDE
Figure 58. Flow rate controller
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