3-7
MAINTENANCE
SL 26-260 G3, SL 40-399 G3 MODULATING GAS BOILERS
11. With a permanent marker or equivalent, make an alignment mark on the refractory,
lining it up with the same mark made earlier between the lid and heat exchanger.
12. Carefully remove the refractory, and place in a clean dry area.
13. If the burner needs to be removed, gradually loosen the screws that secure the burner
to the heat exchanger lid with an M5 hex screwdriver. Then, remove the screws and
the burner.
Re-assembly
SL 26-260 G3
1. Inspect the burner gasket: look for cracks, deterioration or signs of gas bypass.
Replace if necessary.
2.
Place the heat exchanger lid on a flat surface, and position the gasket on the lid,
aligning it with the screw holes.
3. Install the burner in place with its four screws, tightening the screws gradually and in a
cross sequence. Do not over tighten; tighten by hand plus an 1/8 of a turn to maintain a
good seal and to prevent deformation of the burner flange.
4.
Inspect the refractory for cracks, degradation and flatness. If in doubt, replace with a
new one.
5.
If installing a new refractory, first place it onto the lid, aligning it at the igniter hole,
then make an alignment mark on the refractory to correspond with the previously
made line on the lid.
6. Carefully insert the refractory into the heat exchanger combustion chamber, using the
alignment marks for proper positioning.
7. Ensure that the lid gasket is in good condition, and is in place and level.
8. Carefully insert the lid-burner assembly straight down. Ensure that there is limited
contact between the burner and the refractory as well as observe the alignment
markings.
9. Install the 8 hex nuts to secure the lid in place; tighten by hand plus an extra 1/2 to 1
turn. Caution! Over-tightening these nuts will cause the lid to warp and possibly leak
fumes or flames.
10. Re-install the igniter, tightening its screws by hand plus an extra 1/8 of a turn.
11. Re-attach the igniter wire to the igniter, gas valve cable and the two fan plugs.
SL 40-399 G3
1. Inspect the burner gasket: look for cracks, deterioration or signs of gas bypass.
Replace if necessary.
2.
Place the heat exchanger lid on a flat surface and position the gasket on the lid,
aligning it with the screw holes.
3. Install the burner in place with its screws, tightening the screws gradually and in a cross
sequence. Do not over tighten; tighten by hand plus a 1/2 turn to maintain a good seal
and prevent deformation of the burner flange.
4.
Inspect the refractory for cracks, degradation and flatness. If in doubt, replace with a
new one.
5.
If installing a new refractory, first place it onto the lid, aligning it at the igniter hole,
then make an alignment mark on the refractory to correspond with the previously
made marking on the lid.
6. Carefully insert the refractory onto the heat exchanger combustion chamber, using
the alignment marks for proper positioning.
