37
2.
Separate hose
C
to the neutralising
system (if installed) from siphon
B
.
3.
Connect drain or cleaning hose
D
to
the siphon and run it to the drainage
system.
4.
Clean the inside of the condensate
drain system (hose, pipe).
5.
Add water to the combustion cham-
ber.
Note
The water must flow from the con-
densate drain without back pressure.
If necessary, clean the condensate
drain pipe again.
6.
Clean the neutralising system (if
installed) in accordance with the
manufacturer's instructions.
Neutralising system operating
instructions
Note
The neutralising agent can be
obtained from Viessmann by quoting
part no. 9521 702.
7.
Undo and flush lower part
A
of
siphon
B
.
8.
Fill lower part
A
of siphon
B
with
water and reassemble.
9.
Refit the condensate drain system
and the back cover panel.
Note
The hose connection to the on-site
condensate system or to the neutral-
ising system must not be permitted to
sag; support with a pipe if neces-
sary.
Commissioning, inspection, maintenance
Further details regarding the individual steps
(cont.)
5794 780 GB
