19
18.6 TO REMOVE THE PRESSURE REGULATOR
1.
Remove the outer case see section 18.3.
2.
Disconnect the pipes from each end of the regulator and spring them
free from the test tapping tee pieces.
3.
Remove the two regulator bracket screws and lift the regulator unit
free.
4.
Fit new regulator assembly in the reverse order. When replacing
make sure that the regulator flow direction is correct. The regulator
has a flow direction arrow on its back face. Seal with pipe sealant.
5.
Note that if fitting a new regulator, the regulator fixing holes are
unthreaded. Tapping screws are used.
18.7 TO REMOVE THE CONTROL VALVE AND
IGNITION SPARK GENERATOR
1.
Remove the outer case (see section 18.3)
2.
Disconnect the heater from the venting system and pull forward to
gain access to the rear of the control valve.
3.
Disconnect the electrode lead
4.
Disconnect the valve extension rod by removing the split pin just
above the valve spindle and lifting rod upwards (see fig.30)
5.
Disconnect the four pipes from the control valve.
6.
Remove the control valve securing nut.
7.
Disconnect the thermocouple and vent sensor wires from the
interrupter block.
8.
Transfer the extension rod/valve spindle connector to the
replacement valve.
9.
Refit in reverse order. Test for leaks.
18.8 TO REMOVE THE IGNITION SPARK GENERATOR
1.
Remove the control valve and spark generator as 18.7 above.
2.
Make sure that the valve is in the off position.
3.
Remove the circlip holding the spark generator to the valve. Remove
the generator.
4.
Refit in the reverse order. Seal with pipe sealant.
18.9 TO REMOVE THE THERMOCOUPLE
1.
Remove the outer case (see section 18.3)
2.
Remove the window unit assembly
3.
Undo the thermocouple from the interrupter block at the bottom of
the control valve (note that the vent sensor wires will then be loose).
Undo the nut securing the thermocouple probe to the manifold panel
and withdraw the thermocouple.
4.
Remove the screw securing the firebox front cross rail and decorative
baffle at the right side.
5.
Slacken the screw securing the cross rail and decorative baffle at the
left side and swing the rail down at the right side to give access to the
nut securing the thermocouple probe.
6.
Refit in the reverse order. When reconnecting the thermocouple nut
to the control valve, make sure that the vent sensor wires are properly
located. Initially screw the thermocouple nut until finger tight, then
finally tighten a further quarter turn with a wrench.
Fig. 29 Regulator removal points
Fig. 30 Valve removal points