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 cabinet door, and then remove 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. Disconnect the electrical wire from the gas valve.
5.
Using a wrench to support the compression coupling , unscrew the compression nut. This
allows you to separate the gas line pipe from the gas valve.
6.
Unscrew the coupler nut , and remove the gas valve and gasket. Retain the gasket for the
new gas valve.
7.
Install the new gas valve and gasket with the coupler nut .
8.
Using a wrench to support the compression coupling, screw on the compression nut .
9. Reattach the electrical wire to the gas valve.
10. Open the gas supply, and check for gas leaks.
11. Tune the gas valve.
Replacing the gas valve on an SL 40-399 G3
For reference, see Figure 42 .
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 cabinet door, and then remove 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. Note the colors and orientation of the electrical wires before disconnecting them from the
gas valve.
5.
Separate the aluminum gas block (gas inlet) from the gas valve by removing the 4 bolts.
Retain the O-ring, or replace if worn.
6.
To remove the gas valve, remove the 4 bolts from the outlet connector . Retain the O-
ring, or replace if worn.
7.3.2 Replacing the gas valve
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