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Ariston Clas HE R Manual

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COMMISSIONING
Test function and combustion analysis
The boiler has two pressure test points to measure the combustion
gas temperature, the combustive air and the concentrations of O2
and CO2 on the outside of the flue gas header.
To access these pressure test points, unscrew the screw which holds
the blanking cover and its seal together.
Checking the gas setting
To carry out combustion analysis, the test function must be activa-
ted.
Maximum or
minimum CO
2
CLAS HE R 24 EU
CO
2
(%)
G20 from 8.3 to 9.7
G31 from 9.8 to 10.2
8
50
Only a 2.5 mm allen
key must be used. Do
not use a screwdriver
2
Only a 4 mm allen key
must be used. Do not use
a screwdriver
51
Test function
The PCB allows the appliance to be forced to minimum or
maximum power.
Activate the test function by pressing the Reset button for 5
seconds, the boiler switches to maximum heating power, the
following appears on the display:
To select the function at maximum domestic hot water, press the
button, the following appears on the display :
To select the function at minimum domestic hot water, press the
button, the following appears on the display :
The function is automatically deactivated after 10 minutes or by
pressing the Reset button.
Note: the appliance can be forced to minimum or maximum
power from menu 7 (see the section on the display - setting -
diagnostics menu).
WARNING! BY ACTIVATING THE TEST FUNCTION,
THE TEMPERATURE OF THE WATER SENT TO THE
INSTALLATION IS LIMITED TO 88°C; CAUTION IS
THEREFORE REQUIRED WITH REGARD TO LOW-
TEMPERATURE INSTALLATIONS.
Maximum gas flow combustion analysis
Activate the test function at the maximum heating power, press the
+ button.
Wait for the boiler to stabilise before carrying out the combustion
analysis. Check the CO2 value according to the table opposite.
N.B: when the front combustion chamber panel is open, the CO2
value drops by 0.3%.
If the values taken differ from the table, adjust the gas valve fol-
lowing the procedure described below.
Adjust the CO2 content to ± 0.2 by turning setting screw 50 (2.5
mm allen key)
- tighten to lower the CO2 value
- unscrew to increase the CO2 value
Set the content by turning the screw about a 1/4 of a turn then wait
after each change for approximately 1 minute for the CO2 value to
stabilise, then repeat.
Minimum gas flow combustion analysis
Activate the test function at minimum power by pressing the -
button.
Wait for the boiler to stabilise before carrying out the combustion
analysis. Check the CO2 value according to the table above.
Important: do not remove silencer 13
N.B: when the combustion chamber is open, the CO2 value
drops by 0.3%.
If the values taken differ from the table, adjust the gas valve fol-
lowing the procedure described below.
To adjust the CO2 value, remove cap 2, adjust the CO2 content to ±
0.2 by turning setting screw 51 (4 mm allen key)
- unscrew to lower the CO2 value
- tighten to increase the CO2 value
Set by turning the screw about a 1/4 of a turn then wait after each
change for approximately 1 minute for the CO2 value to stabilise,
then repeat.
Once the settings and analyses are complete, exit test mode, and
reposition the blanking cover and its seal correctly.
… 32 …


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