Installation
&
Servicing
instructions
AT
AG
A200SOV
28
12.2 Maintenance activities
In order to perform maintenance, the following actions have to be taken:
- switch off the boiler;
- remove the screws from the 4 quick fasteners A, B, C and D (see fig. 13);
- unlock the 4 quick fasteners A, B, C and D and remove the cover in a forward motion.
Air box/cover
The cover also doubles as air box:
- Clean the air box/cover with a cloth and a non-abrasive cleaner;
Fan unit and burner cassette (see fig. 14, 15 and 16)
- dismantle the igniter(1) by means of the screw of the gas block;
- pull out the plug connections (2) of the fan;
- unscrew the coupling (3) of the gas block;
- replace the gas block gasket (O-ring) with another;
- unscrew the front crosshead screw (4) from the air supply damper;
- now turn the left (5) and right (6) clamp bars a quarter turn and pull these out in a
forward motion. Mind the direction of rotation (red control cams);
- now remove the complete fan unit with the gas block from the heat exchanger in a
forward motion;
- remove the burner cassette from the fan unit;
- check the burner cassette for wear, pollution and possible fracture. clean the burner
cassette with a soft brush and a vacuum cleaner. in case of a fracture always replace
the entire cassette assembly;
- replace the gasket between the burner and upper tray and the gasket between the
upper tray and the heat exchanger;
- check the venturi and gas air dividing plate for pollution and clean them with a soft
brush in combination with a vacuum cleaner, if necessary. If the air cabinet is heavily
polluted with dust, it is likely that the fan impeller is also polluted. To clean the fan,
it has to be removed from the upper tray and the venturi. Clean the impeller with a
soft brush and a vacuum cleaner. Replace the gasket and take care that the new
gasket is installed properly when reassembling the fan parts.
Heat exchanger
- check the heat exchanger for pollution. Clean it, if necessary, with a soft brush and
a vacuum cleaner. Avoid any pollution falling down.
Top-flushing the heat exchanger with water is not allowed.
Reassembly takes place in reverse order.
During installation pay attention to the correct position of the clamp bars. These
have to be in a vertical position.
1
2
3
9
4
10
Figure 13
Figure 14
Figure 15
6
7
8
5
11
12
Figure 16
