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Boiler
Clean the boiler as indicated in its accompanying instructions in
order to maintain all the original combustion characteristics in-
tact, especially the flue gas temperature and combustion cham-
ber pressure.
Gas leaks
Make sure that there are no gas leaks on the pipe between the
gas meter and the burner.
Gas filter
Change the gas filter when it is dirty.
Combustion
If the combustion values measured before starting maintenance
do not comply with applicable legislation or do not indicate effi-
cient combustion, consult the or contact our Technical Support
Service to implement the necessary adjustments.
It is advisable to set the burner according to the type of gas used
and following the indications in .
EN 676
Max. output
CO
CO
theoretic
2
2
GAS
al max. 0% O
= 1.2
2
G 20
11.7
9.7
G 25
11.5
9.5
G 30
14.0
11.6
G 31
13.7
11.4
20163821
Air excess
Min. output
1.2
1.3
% Calibration
CO
= 1.3
mg/kWh mg/kWh
100
9.0
100
8.8
100
10.7
100
10.5
Maintenance
7.2.4
QRI flame detector
In order to reach the flame detector, proceed as follows:
extract the QRI flame detector 1)(Fig. 32);
clean the glass cover from any dust that may have accumu-
lated.
1
20162956
7.2.5
Voltage on the QRI sensor
NO
Minimum value for correct operation: 3.5V DC (value on AZL dis-
X
play at about 50%).
If the value is lower, it could be due to:
170
–
sensor not positioned correctly
170
–
low voltage (lower than 187V)
230
–
bad regulation of the burner
230
In order to measure, use a voltmeter with a 10V DC scale con-
nected as in the diagram (Fig. 32).
Tab. N
D9174
36
GB
Fig. 31
LMV...
X10-02 / 6
X10-02 / 4
X10-02 / 2
+
0...10 V
Ri > 10 M
Fig. 32
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