Ariston E-COMBI 24 30 38 manual Test function and combustion analysis, Checking the gas setting

commissioning

Test function and combustion analysis

The boiler has two pressure taps 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 taps, unscrew the screw which holds the blanking cover and its seal together.

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Only a 2.5 key must be used

				Minimum gas flow combustion analysis
				Activate the test function at minimum power in either heating or
				domestic hot water production.
				Wait for the boiler to stabilise before carrying out the combustion
				analyses. Check the CO2 value according to the table above.
				Important: do not remove silencer 17
Checking the gas setting				N.B. When the combustion chamber is open, the CO2 value drops
To carry out analyses of combustion, the test function must be				by 0.3%.
				If the values taken differ from the table, adjust the gas valve following
activated.
				the procedure described below.
Maximum gas flow combustion analysis				To adjust the CO2 value, remove cap, adjust the CO2 content to ± 0.2 by
Activate the test function at the maximum heating power, pushing				turning setting screw 51 (4 mm allen key)
for 5 seconds the RESET until the yellow led 9 blinks (also 60°C led is				- unscrew to lower the CO2 value
lit to indicate that Chimney is at max. CH absolute) The rotate the CH				- tighten to increase the CO2 value
knob to the min., intermediate position or max position it’s possible				Set the content by turning the screw about a 1/4 of a turn then wait
to switch between min, max CH absolute and max DHW power				after each change for approximately 1 minute for the CO2 value to
(respectively the 40°C, 60°C and 80°C are lit to indicate the power				stabilise, then repeat.
level.				Once the settings and analyses are complete, exit test mode by
The function is automatically deactivated after 10 minutes or by				pressing Reset and reposition the blanking cover and its seal correctly.
pressing the RESET button.
Wait for the boiler to stabilise before carrying out the combustion
analyses. Check the CO2 value according to the table below.
Important: do not remove silencer 17
N.B. When the front combustion chamber panel is open, the CO2
value drops by 0.3%.
CO2	24	30	38
maximum		CO2 (%)
minimum
G20	9.0 ± 0.2	9.0 ± 0.2	9.4 ± 0.2
G31	10.7 ± 0.2	10.0 ± 0.2	10.6 ± 0.2
If the values taken differ from the table, adjust						Only a 4 key must be used
the gas valve following the procedure described
below.						24		30		38
Adjust the CO2	content to ± 0.2 by turning		Gas setting
					G20	G31	G20	G31	G20	G31
setting screw 50 (2.5 mm allen key)
			lower Wobbe index
- tighten to lower the CO2 value					45.67	70.69	45.67	70.69	45.67	70.69
			15°C, 1013 mbar) (MJ/m3)
- unscrew to increase the CO2 value					NO	3.80	NO	4.50	NO	5.25
Set the content by turning the screw about a			gas valve restrictor(ø)
1/4 of a turn then wait after each change for			gas flow max/min	max D.H.W	2.65	1.94	3.17	2.33	4.02	2.95
approximately 1 minute for the CO2 value to			(15°C, 1013 mbar)	max C.H.	2.33	1.71	2.96	2.17	3.28	2.41
stabilise, then repeat.			(nat - m3/h) (GPL - kg/h) min		0.58	0.43	0.69	0.50	0.79	0.58

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