Bedienungsanleitung Ariston Clas HE R (Seite 32 von 64) (Englisch)

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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

CLAS HE R 24 EU

(%)

G20 from 8.3 to 9.7

G31 from 9.8 to 10.2

Only a 2.5 mm allen

key must be used. Do

not use a screwdriver

Only a 4 mm allen key

must be used. Do not use

a screwdriver

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.

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