Replacing components
Installation and maintenance instructions ecoTEC 0020173113_01
65
14
>
Remove the plug from the gas valve (
7, ¬ fig. 14.2
).
i
The plug on the fan motor has a latching lug
with which it engages in the slot. You have to
release the latching lug by pushing it in to pull
off the plug.
>
Remove the plug (
6, ¬ fig. 14.2
) from the fan motor.
>
Unscrew either the cap nut (
2, ¬ fig. 14.3
) from the gas
valve or the cap nut (
8, ¬ fig. 14.2
) between the gas
pipes.
>
Secure the gas pipe against twisting by holding the pipe
against the spanner flat when undoing the cap nut.
>
Unscrew the three screws (
2-4, ¬ fig. 14.2
) between the
mixture pipe (
1, ¬ fig. 14.2
) and the fan flange.
1
2
14.3
Removing the gas valve from the fan
>
Remove the entire fan/gas valve unit from the boiler.
>
If you want to replace the gas valve, unscrew the cap nut
(
2
,
¬ fig. 14.3
) if the gas pipe is still secured to the gas
valve.
>
Unscrew the two fixing screws (
1, ¬ fig. 14.3
) from the
gas valve and remove the fan from the gas valve.
>
Replace the defective fan or the defective gas valve.
>
Fit the gas valve and the fan in the same position as
before. Use new seals.
>
Screw the fan to the gas valve.
>
If you had replaced the gas valve, screw the cap nut of
the gas pipe (
2, ¬ fig. 14.3
) only loosely to the gas valve.
Only tighten the cap nut on the gas valve after complet-
ing the installation work.
>
Refit the entire fan/gas valve unit in reverse order. You
must
use a new seal for this (
5, ¬ fig. 14.2
).
>
Pay attention to the order in which the three screws
between the fan and the mixture pipe are screwed in, as
per the numbering
3, 2
and
4
(
¬ fig. 14.2
).
14.4
Secure the gas pipe against twisting
>
Tighten the cap nut (
2, ¬ fig. 14.3
) on the gas valve and
the cap nut (
8, ¬ fig. 14.2
) between the gas pipes. Use
new seals.
>
Secure the gas pipe against twisting (
¬ fig. 14.4)
by
holding the pipe against the spanner flat when tighten-
ing the cap nut.
>
After completing the work, perform a gas-tightness
check and function check (
¬ section 10.13
).
>
If you have fitted a new gas valve, adjust the gas setting
(
¬ section 10.10
).
14.4
Replacing the expansion vessel
>
Drain the boiler (
¬ section 12.2.2
).
1
2
3
4
14.5 Replacing the expansion vessel
>
Loosen the screw connection (
4
) at the water connec-
tion on the underside of the expansion vessel.
>
Remove both screws (
1
) on the support plate (
2
).
>
Remove the support plate (
2
).
>
Pull out the expansion vessel (
3
) from the front.
>
Insert the new expansion vessel into the boiler.
>
Screw the new expansion vessel to the water connection.
Use a new seal for this.
>
Attach the support plate using both screws (
1
).
>
If necessary, adjust the pressure to the static height of
the heating installation (
¬ section 12.3.7
).
