20
4.
Disconnect the connecting cables from fan
E
.
Remove the fan.
Danger
Mains voltage can be life threatening.
For maintenance work, isolate the gas fan
from the power supply.
Note
Ensure that the gasket between the fan casing and
the burner flange is correctly positioned.
5.
Clean the fan housing and impeller with com-
pressed air.
6.
If required, vacuum the inside of burner gauze
assembly
F
.
Installing the burner
B
C
E
D
A
Fig. 20
1.
Mount fan
E
.
Note
Ensure that the gasket between the fan casing and
the burner flange is correctly positioned.
2.
Plug the connecting cables onto fan
E
.
3.
Secure Venturi mixing pipe
D
with gas train
A
and gas supply pipe
B
to fan
E
. Attach the con-
necting cables.
4.
Tighten fitting
C
on gas supply pipe
B
.
Danger
Escaping gas leads to a risk of explosion.
Check the fitting and gasket between the fan
casing and the burner flange for gas tight-
ness.
Closing the boiler door
Note
Tighten the boiler door screws evenly and diagonally,
with a torque of at least 18 Nm.
Danger
Leaks can result in a risk of poisoning through
escaping gas.
Prior to commissioning, check the boiler door
gasket for correct seating and realign if neces-
sary. Otherwise secondary ventilation may
occur, with condensate forming on the boiler
door, and gas may escape.
Automatic tightness test on the two gas train valves
The burner control unit automatically checks the valves
for tightness when the burner is started. If the valves
are gas-tight, the burner enters standard mode and
starts up.
If the 1st valve is not tight, fault code "F AE" is shown
on the burner control unit display; if the 2nd valve is
not tight, fault code "F AF" is displayed.
In either case, the gas train must be replaced.
Danger
Escaping gas leads to a risk of explosion.
Check the test connectors for gas tightness.
Commissioning, inspection, maintenance
Cleaning the burner
(cont.)
5783 337 GB
