29
1.
Insert burner
A
and secure with four
nuts
B
, tightening the nuts evenly
and crosswise.
Torque: 4 Nm
2.
Fit gas supply pipe
C
with new gas-
ket
D
.
Torque: 15 Nm
3.
Plug in ventilation air adaptor
E
.
4.
Connect the electrical cables/leads to
the corresponding components.
Checking all gas equipment for tightness at operating pressure
Danger
Escaping gas leads to a risk of
explosion.
Check gas equipment for tight-
ness.
Note
For the tightness test, use only suitable
and approved leak detecting agents (EN
14291) and devices. Leak detecting
agents containing unsuitable substan-
ces (e.g. nitrites, sulphides) can lead to
material damage.
Remove residues of the leak detecting
agent after testing.
Checking the combustion quality
The electronic combustion controller automatically ensures optimum combustion
quality. During commissioning/maintenance, only the combustion values need to be
checked. For this, check the CO
2
or O
2
content. For a description of the electronic
combustion controller functions, see page 125.
Note
Operate the appliance with uncontaminated combustion air to prevent operating
faults and damage.
CO
2
or O
2
content
■ The CO
2
content must be within the following limits (upper and lower output):
– 7.7 to 9.2 % for natural gas E and LL
– 9.3 to 10.9 % for LPG P
■ For all gas types, the O
2
content must be between 4.4% and 6.9 %.
If the actual CO
2
or O
2
values lie outside their respective ranges, proceed with the
following steps:
■ Carry out a tightness test of the balanced flue system, see page 17.
■ Check ionisation electrode and connecting cable, see page 21.
Commissioning, inspection, maintenance
Further details regarding the individual steps
(cont.)
5692 860 GB
Summary of Contents for CU3A
Page 147: ...147 5692 860 GB ...
