25
14.8
TO REMOVE THE THERMOCOUPLE INTERRUPTER
BLOCK (See figure 43)
14.8.1
Remove the front surround unit - See section 14.3.
14.8.2
Detach the thermocouple from the interrupter block by
unscrewing the thermocouple nut.
14.8.3
Detach the two microswitch leads from the interrupter block.
14.8.4
Remove the interrupter block by unscrewing from the gas shut-
off tap.
14.8.5
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.
14.9
TO REMOVE THE PILOT UNIT (See figure 44)
14.9.1
Remove the burner unit - See section 14.6.
14.9.2
Detach the pilot pipe from the gas shut-off tap.
14.9.3
Detach the thermocouple from the interrupter block by unscrewing
the thermocouple nut.
14.9.4
Detach the electrode lead from the underside of the electrode tab.
14.9.5
Remove the first screw
s
ecuring the dust cage to the
pilot unit &
burner. Carefully remove the dust cage and place aside. See figure 44.
14.9.6
Remove the second screw securing the
pilot unit to the burner.
Remove the pilot unit and place it aside. See figure 44.
14.9.7
Disconnect the pilot pipe from the pilot unit elbow.
14.9.8
Refit in the reverse order.
Note
1 The pilot unit must be replaced as a whole assembly. Its individual
components are not separately replaceable.
2. Once removed, ensure that the dust cage is cleaned before refitting. Make
sure that it locates squarely onto the pilot unit without any gaps between the
cage edges and the pilot unit.
3. 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.
14.10
TO REMOVE THE SHUT-OFF TAP (See figure 45)
14.10.1
Remove the burner unit - See section 14.6.
14.10.2
Turn the burner unit upside down.
Detach the thermocouple and interrupter
block from the tap - See sections 14.8.2 to 14.8.4.
14.10.3
Detach the pilot pipe from the tap.
14.10.4
Detach the inlet pipe.
14.10.5
Remove the hexagonal nut securing the tap to the mounting bracket.
14.10.6
Detach the elbow by unfastening the hexagonal nut connecting it to the flow rate
controller. Lift the tap (complete with elbow) clear
14.10.7
Loosen the hexagonal locknut securing the elbow to the tap. Remove the elbow by
rotating it.
14.10.8
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.
When refitting the thermocouple and interrupter block, make sure that the microswitch
wires are properly secured to give a good electrical contact.
Fig.45 Shut-off tap (view from rear with
burner turned over)
Fig. 44 Pilot unit removal (Dust cage
not shown for clarity)
Fig. 43 Thermocouple Interrupter Block
Содержание Marseille BR622
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