To Remove The Pilot Unit; To Remove The Shut-Off Tap - Baxi Fires Division 740FS Installer's Manual

that the leads are secured in the interrupter block to give a good electrical contact.

17.10 To remove the pilot unit.

1. Remove the burner unit (See section 17.7).
2. Detach the pilot pipe from the pilot unit.
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.
6. Remove the two screws securing the pilot unit (See figure 57).
7. Refit in the reverse order.
Note: 1.
whole assembly. Its individual components are not separately replaceable.
2.
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.

17.11 To remove the shut-off tap.

(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.Turn
the burner unit upside down. Detach the
thermocouple and interrupter block from the
tap (See section 17.9 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.
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.
©
Baxi Heating U.K. Limited 2007.
INSTALLER GUIDE
The pilot unit is an atmosphere sensing device. It must be replaced as a
When the thermocouple is removed from the interrupter block, the
Figure 58. Shut-off tap (Viewed
from rear with burner turned over)
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