7.3.2 Replacing the gas valve on the SL 85, 115, 160 and 199 G3
boilers
For reference, see Figure 51
Removing the gas valve
1. Turn off the electric power and gas supply to the boiler.
2. Ensure that the boiler cools down to the surrounding temperature. Do not drain the boiler
unless freezing conditions are expected during this procedure.
3. Remove the door and the top cover/lid.
A ladder or step may be required to have a clear vertical view of the work area. Do not attempt
to reach from the front without a clear view, as damage to connectors or screws may occur.
4.
To disconnect the gas valve electrical cable , remove the screw.
5.
Unscrew the upper nut of the gas valve.
6. Carefully push down on the gas valve, and remove the orifice and O-ring.
7.
Unscrew the lower nut of the gas valve, and remove from the gas valve bracket. Ensure
that the gasket remains inside the nut.
Installing the new gas valve
1. Position the lower part of the new gas valve so that it is supported by the gas valve bracket,
then tighten with the lower nut. Ensure that the gasket is in place.
2. Ensure that the gas valve orifice and O-ring are in place before you tighten the upper nut.
3. Reconnect the gas valve electrical cable with the screw.
4. Turn on the power and gas supply.
5. Check for gas leaks.
6. Tune the gas valve.
7.3.2 Replacing the gas valve on the SL 85, 115, 160 and 199 G3 boilers
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