Descaling Of Domestic Heat Exchanger; Cleaning Of Water Section - Vaillant VCW 2O Instructions For Installation And Servicing

:
-:_Tove the venturi
tube situated in the riqht_
-a-c connection
of the heating O"Ov.b'nZci
:,:.e and o-ring, clean bore and-repla6"
;_*;;
- -gcessary.
=;lp9emble
..in reverse oroer, ensurino
A:shers
.are fitted in heat "".n",ig"i'r;;;X
: - J rlue duct engaged in spigot in flr;
6rrn*;;;i
8.5 Cleaning of water section
I?_-l"Toy.q. the water section unscrew the
'nrernat.. (N)
and the external- (M)";"i;;
connections and loosen the screw (L).
i:^,,!:tl ":tess to the connections
unscrew
:ne tower retaining frame.
8.4 Descaling of domestic heat exchanger
111:l]r_etcessarytodescatethedomestic-heat
excnanger remove the tl
.1"_.-:y'q
saus" "nd t-n"',i:",ru
i:Ji:?"T;
-nscrewing the 2 tubing nuts. For 6et-tei;;;";i
:o the connections. reriove the b;;;;e;;fi;;
=i:"^ p^y .unscrewing tne S retatning ;;;ily
.1?I--qy9 the 3 u.nion nuts (K) "io-ir,"'"2
-o_ rarn lng_ screws (
l). Descale b,jr".ti" rlt"?
:11e_: ?y ptoryetary descating agents anO rinl-e
arerwards with clean water.
3ea:semble in reverse oroer
using new
/yashers.