To Remove The Pilot Unit; To Remove The Shut-Off Tap - Valor Fires 953 Installer And Owner Manual

17.9 To remove the pilot unit.

1. Remove the burner unit (See section 17.6).
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 40).
7. 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 retightening the
thermocouple nut. Do not overtighten the nut.

17.10 To remove the shut-off tap.

(See figure 41).
1. Remove the burner unit (See section
17.6).
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 17.8
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.
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"
©
Baxi Heating U.K. Limited 2010.
INSTALLER GUIDE
Figure 41. Shut-off tap (Viewed from rear
with burner turned over)
Page 39
Figure 40. Pilot unit removal