Installation & Servicing instructions
AT
AG XL
54
13.3 Maintenance activities
Required tools:
- Cross head screwdriver
- ATAG T-handle key set with 3 bits (hex key 4mm, hex key 5mm and cross head PZ2)
- Open end wrench 8mm
The following actions have to be taken in order to be able to carry out maintenance:
- Switch the device off using the mains switch,
- Close the gas tap;
Refer to figure 13.3.a:
- Unscrew the 4 screws of quick-locks A, B, C and D
- Open the 4 quick-locks A, B, C and D and remove the housing (= air box) from the
front.
Dismantle the internal flue gas pipe as follows (refer to fig. 13.3.b):
- Unplug the flue gas sensor if fitted;
- Press the 2 clips of the siphon adapter (F) and push that part of the flue gas vent pipe
(E) down. Leave the siphon adapter (F) hanging on the bottom plate
- Slide the slider (G) in the upper part of the flue gas pipe upward.
- Pull the flue gas pipe (E) forward (both exchangers simultaneously).
Ventilator unit and burner cassette (refer to fig. 13.3.c, d and e)
- Remove the plug connections of the gas valve (1) and ventilator (2);
- Unscrew the coupling (3) of the gas unit;
- Replace the gas valve gasket with a new one;
- Unscrew the front cross-slotted screw (4) of the air suction damper (5);
- Loosen the left (9) and right (10) clamp bar a quarter of a turn with the hex key and
pull it out in a forward direction. In doing so, pay attention to the turning direction (red
check cams);
Removing housing
figure 13.3.a
Removing flue pipe
figure 13.3.b
F
G
E
figure 13.3.c
2
1
3
10
8
12
7
5
9
4
5
