7.3.1 Replacing the fan on the SL 85, 115, 160 and 199 G3
boilers
For reference, see Figure 51
Removing the fan
1. Turn off the electric power and gas supply to the boiler.
2. Ensure 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.
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 the gas valve, and remove the orifice and O-ring.
7.
To remove the gas valve, unscrew the lower nut . Ensure that the gasket remains
inside the nut.
8. Disconnect the electrical cable from the fan.
9.
Remove the screws or nuts securing the fan to the coupler.
10. Remove the fan and fan gasket.
Installing the new fan
1. Install the new fan gasket and fan.
2. Secure the fan to the coupler using the two screws.
3. Reconnect the electrical cable to the fan.
4. Insert the lower part of the gas valve so that it is supported by the gas valve bracket, then
tighten with the lower nut. Ensure that the lower gas valve gasket is in place.
5. Ensure that the gas valve orifice and O-ring are in place before you tighten the upper nut.
6. Reconnect the gas valve electrical cable with the screw.
7. Turn on the power and gas supply.
8. Check for gas leaks.
9. Tune the gas valve.
Section: Service and maintenance
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