102
EN
6.8
Gas calibration
After checking that the boiler is operating correctly, you must
take combustion readings as well as maximum and minimum
power readings, and check the combustion efficiency by
activating the
chimney sweeper function
.
6.8.1
Chimney sweep function and calibration
The chimney sweeper function is used by the qualified
maintenance technician to check the gas pressure, detect the
combustion parameters and measure the combustion efficiency
when required by the legislation in force.
This function lasts 15 minutes and is activated by proceeding
as follows:
– with the boiler inactive, loosen the screw on the mains tapping
point (1) on the gas valve and connect a pressure gauge
GAS VALVE
ALU HE 80
ALU HE 116
ALU HE 160-200-240-280
1
1
1
Fig. 33
– activate a heat request
– press button
s
or
n
to activate the boiler.
Leave the appliance to stabilise, then:
– press and hold the
M
button for a few seconds, until you see
the
z
figure flashing
– press the
Z
button to operate the boiler on maximum power
(Qmax) as indicated on the display with
v
– check that the gas supply pressure is: G20=20 mbar -
G31=37mbar
– measure the CO
2
and check that it corresponds to the value
in the table. If it does not correspond, adjust the "maximum
power adjustment screw" (2) on the gas valve until you obtain
the CO
2
value shown in the table. Take any other necessary
readings.
m
IMPORTANT
The gas valve on the
ALU HE
80
is equipped with
TWO
screws to adjust the maximum power
:
– screw (2) for an approximate adjustment
– screw (3) for a finely tuned adjustment.
We recommend adjusting the two screws alternately.
Once any necessary adjustments and readings have been made:
– press the
N
button to operate the boiler on minimum power
(Qmin) as indicated on the display with
G
– measure the CO
2
and check that it corresponds to the value
in the table. If it does not correspond, adjust the "minimum
power adjustment screw" (4) on the gas valve until you obtain
the CO
2
value shown in the table.
GAS VALVE
2
3
2
4
4
2
4
ALU HE 80
ALU HE 116
ALU HE 160-200-240-280
Fig. 34
ALU HE
CO
2
(G20)
CO
2
(G31)
Qmax
(% ± 0,2)
Qmin
(% ± 0,2)
Qmax
(% ± 0,2)
Qmin
(% ± 0,2)
80
9,3
9,1
10,6
10,3
116
9,3
9,1
10,6
10,3
160
9,3
9,1
10,5
10,3
200
9,3
9,1
10
9,7
240
9,3
9,1
-
-
280
9,5
9
-
-
m
CAUTION
This procedure MUST BE PERFORMED after:
– gas conversion
– changing the gas valve following a fault.
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