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.
5. Remove the two screws securing the pilot unit (See
figure 47).
6. 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. 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 re-
tightening the thermocouple nut.
17.11 To remove the shut-off tap.
(See figure 48).
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 points 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
Page 44
© Baxi Heating U.K. Limited 2009.
INSTALLER GUIDE
Figure 48. Shut-off tap (Viewed from
rear with burner turned over)
Figure 47. Pilot unit removal
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