Installation & Servicing instructions
AT
AG XL
55
- Pull the complete ventilator unit and heat exchanger’s gas valve forward;
- Remove the burner cassette (18) from the ventilator unit;
- Check the burner cassette for wear and tear, pollution and any breakages. Clean
the burner cassette with a soft brush and vacuum cleaner. In the case of breakages,
always replace the complete burner cassette (18);
- Replace the gasket (17) between the burner (18) and upper casing (15) ;
- Replace the gasket (16) between the upper casing (15) and exchanger:
Checking the non return valve in the upper casing, venturi and fan
- Loosen the 2 screws out of the upper casing with a cross head screwdriver to release
the gas air dividing plate. Take out the gas air dividing plate (see fig. 13.3.f)
The following operations must be performed carefully in relation to the vulner
-
ability of the non return valve.
- After removing the gas air dividing plate the non return valve becomes visible. Check
that the non return valve entire circumference closes / seals completely. The valve
should be able to move freely from fully open to fully closed (see fig. 13.3.g). Replace
the non return valve if the valve does not seal properly. Follow the instructions sup-
plied with the new part.
- 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 box 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.
Reassembly takes place in reverse order.
Heat exchanger
- Check the heat exchanger for pollution. Clean it, if necessary, with a soft brush and
vacuum cleaner. Prevent any dirt from dropping down.
Rinsing the exchanger with water from the top is not allowed.
Assembly is done in reverse order.
Ensure during assembly that the clamping bars are properly positioned. They
have to be in a vertical position.
figure
13.3.h
15
16
17
18
figure 13.3.d
Position gasket
figure 13.3.e
Removing gas air dividing plate
figure
13.3.f
Checking non return valve
figure
13.3.g
