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INSTALLER’S GUIDE
Page 32
Figure 50 Pilot unit removal
(Dust cage not shown for clarity)
Figure 51 Shut-off tap (viewed from
rear with burner turned over)
16.9
To Remove the Pilot Unit
1.
Remove the burner unit - See section 16.6.
2.
Detach the pilot pipe from the gas shut-off tap.
3.
Detach the thermocouple from the interrupter
block by unscrewing the thermocouple nut.
4.
Detach the electrode lead from the underside of
the electrode tab.
5.
Remove the first screw securing the dust cage to
the pilot unit & burner. Carefully remove the dust
cage and place aside. See figure 50.
6.
Remove the second screw securing the pilot unit to the burner. Remove the pilot unit
and place it aside. See figure 50.
7.
Disconnect the pilot pipe from the pilot unit elbow.
8.
Refit in the reverse order.
Note:1.
The pilot unit is an atmosphere sensing device. It must be replaced as a
whole assembly. Its individual components are not separately replaceable.
2.
Once removed, ensure that the dust cage is cleaned before refitting. Make
sure that it locates squarely onto the pilot unit without any gaps between the
cage edges and the pilot unit.
3.
When the thermocouple is removed from the interrupter block, the
microswitch lead terminals in the interrupter block will be loose. Make sure
that they are properly secured to give a good electrical contact when
retightening the thermocouple nut.
16.10
To Remove the Shut-Off Tap
See figure 51.
1.
Remove the burner unit - See section 16.6.
2.
Turn the burner unit upside down. Detach the
thermocouple and interrupter block from the tap
- See section 16.8 paragraphs 2 - 4.
3.
Detach the pilot pipe from the tap.
4.
Detach the inlet pipe.
5.
Remove the hexagonal nut securing the tap
to the mounting bracket.
6.
Detach the elbow by unfastening the
hexagonal nut connecting it to the flow rate
controller. Lift the tap (complete with elbow)
clear.
7.
Loosen the hexagonal locknut securing the
elbow to the tap. Remove the elbow by rotating it.