To Remove The Pilot Unit; To Remove The Shut-Off Tap - Valor 940 Installer And Owner Manual

5. Refit in the reverse order. If the microswitch leads cannot be easily attached to the
interrupter block when it is fully tightened to the gas shut-off tap, slacken it and rotate
to allow the leads to be fitted. Retighten making sure that the leads remain in place in
the interrupter block. Fit and tighten the thermocouple nut making sure 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 56).
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.

17.11 To remove the shut-off tap.

(See figure 57).
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.
©
GDC Group Ltd. 2011
INSTALLER GUIDE
Page 45
Figure 56. Pilot unit removal
Figure 57. Shut-off tap (Viewed from
rear with burner turned over)