12.8 To remove the gas flow rate controller.
The gas flow controller and pivot
bracket are identified in figure 17.
1.
Remove the complete burner
module, pipes and pilot as in section
12.7.
2.
When working on the module,
ensure that the work surface is
suitably protected. This will avoid
damage to the work surface.
3.
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.
4.
Remove the hexagonal bolt
securing the control pivot bracket to
the controller at the rear.
5.
Remove the control pivot bracket.
6.
Detach the lower injector pipe at the top of the gas flow rate controller. Support the
controller while detaching to prevent excessive strain.
7.
Detach the lower injector pipe from the lower injector carrier. Do NOT use the PTP
for support as this may cause damage.
8.
Detach the nut from the underside of the gas flow rate controller. Support the
controller while detaching to prevent excessive strain.
9.
Remove the hexagonal nut securing the controller to the mounting bracket.
10
. Loosen the brass nut that holds the shut-off valve to the securing bracket, rotate
the bracket forward and clear of the shut-off valve. Remove gas flow rate controller.
11
. Refit in the reverse order.
12.9 To remove the ‘T’ piece.
1.
Remove the gas flow rate controller as in section 12.8.
2.
Unscrew and remove the upper injector pipe.
3.
Loosen the locking nut where the ‘T’ piece joins the shut-off valve.
4.
Unscrew the ‘T’ piece.
5.
Refit in the reverse order. If replacing the ‘T’ piece, remove the locking nut from the
removed ‘T’ piece and fit it to the replacement.
©
GDC Group Ltd. 2011
Page 28
INSTALLER GUIDE
Figure 17.
