Maintenance
4
Installation and maintenance instructions for Buderus 500 - 24/S • 08/2006
41
Subject to modifications resulting from technical improvements!
Buderus • http://www.buderus-domestic.co.uk
4
Maintenance
4.1
Cleaning the heat exchanger and burner
z
Switch the boiler off by setting the mains switch to "
0
"
(see fig. 51, item 1).
z
Close the gas shut off valve (see fig. 52, item 1).
z
Unlock the securing screw with a radiator key and remove
the casing.
z
Loosen the gas connection between the gas supply and
the gas air unit (fig. 60).
z
Remove the connectors (fig. 61, item 1, 2 and 3) from the
gas air unit.
z
Remove the air silencer from the gas air unit
(fig. 61, item 4).
z
Then remove the connectors of the ionisation electrode
(fig. 61, item 6) and the glow ignitor (fig. 61, item 5).
z
By turning the unit a quarter turn (fig. 62, step 1), the unit
can be removed by lifting it out of the boiler (fig. 62, step 2).
z
Clean the burner when necessary. The burner may only be
cleaned with a soft brush or compressed air.
z
Now the front cover of the heat exchanger can be removed
by opening the latches (fig. 60, item 1).
NOTE
The described cleaning of the burner and heat
exchanger is only necessary when the boiler is
heavily soiled. Otherwise it is sufficient to clean
the burner and heat exchanger with a soft
brush or compressed air without disassem-
bling them.
fig. 60 Loosen gas connection
1
fig. 61 Remove connectors of the gas air unit
1
2
3
4
6
5
fig. 62 Remove gas air unit
1
2
CAUTION
Replace the burner seal after removing the
burner from the gas air unit.
