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16.9 To remove the thermocouple interrupter block.
(See figure 35).
1. Remove the burner unit (See section 16.7).
2. Detach the thermocouple from the interrupter block by unscrewing the thermocouple
nut.
3. Detach the two microswitch leads from the interrupter block.
4. Remove the interrupter block by unscrewing from the gas shut-off tap.
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.
16.10 To remove the pilot unit.
1. Remove the burner unit (See section 16.7).
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 42).
7. Refit in the reverse order.
Note:
1.
a 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.
16.11 To remove the shut-off tap.
(See figure 43).
1. Remove the burner unit (See section 16.7).
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 16.9 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
INSTALLER GUIDE
The pilot unit is an atmosphere sensing device. It must be replaced as
When the thermocouple is removed from the interrupter block, the
Page 32
Figure 42. Pilot unit removal
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