56
Replacing the Gas Filter
1. Gain access to the instrument enclosure using as previously
described.
2. Undo the knurled nut on the gas solenoid using a 12mm A/F
spanner. Remove the tube from the solenoid and retain the
nut.
3. Cut the blue tube away from the gas flow adjustment valve
(it is important not to pull this away from the valve as it is a
very tight fit and damage to the valve can occur, it is also
important when cutting not to apply pressure with a sharp
edge to the barb on the gas valve so as not to score the
sealing face.
4. Pull the white tube from the gas adjustment valve.
5. Carefully pull the blue tube from the mixing chamber barb
(in a straight direction to prevent snapping the barb) and
feed the blue tube through the grommet in the chassis wall.
6. Release the gas filter from the retaining clip and remove the
assembly.
7. The assembly can be replaced in the reverse order.
It is essential that a leakage check is performed using a soap
solution or BWB leak detection solution once the unit is put back
to functional condition, but before replacing the Front Panel and
Top Cover securing screws. Initiate a flame start sequence
allowing the solenoid to pass gas, lower the Front Panel and
check all gas connections for leaks whilst flame is alight. Once all
connections have been confirmed as free from leaks, refit and
secure the Front Panel and Top Cover.
Gas Filter
Gas Filter
Retaining clip
Transparent tube
Blue tube
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