25
3.
Carry out a tightness test.
Note
Only use suitable and approved leak detection
agents (EN 14291) and devices for the tightness
test.
Leak detection agents with unsuitable constituents
(e.g. nitrites, sulphides) can cause material dam-
age.
Remove residues of leak detection agents after
testing.
!
Please note
Excessive test pressure will damage the
burner and gas train.
Max. test pressure 150 mbar/15 kPa
.
If a higher pressure is required for tightness
tests, disconnect the burner and the gas
train from the main supply pipe (undo the fit-
ting).
Damage due to excessive test pressure is
excluded from our warranty.
4.
Purge the gas line.
Danger
Escaping gas can lead to explosions which
may result in serious injury.
Never
purge the gas line through the boiler
combustion chamber.
Fitting further casing sections
Back panels
Parts required from thermal insulation pack 2:
■
Bottom back panel
wO
■
Centre back panel
wI
■
Top back panel
wU
■
Screws from bag of fixing parts
eQ
A
2.
3.
1.
wU
wO
wI
Fig. 22
Note
For room sealed operation, break out section
A
from
bottom back panel
wO
.
Installation instructions for room sealed acces-
sories
Note
The flue gas collector may differ from that shown, sub-
ject to system version (stainless steel or plastic).
Burner connections on the gas side
(cont.)
5833527
