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4.5 Combustion checking procedure
The order of operations for this procedure must always be
respected.
Operation 1 - Supply pressure check
Loosen the screw 1 and insert the pressure gauge connection
pipe into the pipe tap.
Switch the boiler on at maximum power, enabling the "Test
function" (press the RESET button for 10 seconds; the display
will show TEST).
The supply pressure should correspond to the value
established in relation to the type of gas ,for which the boiler
is designed see Table summarising changes.
Fig. 4.2
Operation 2 - Preparing the measuring equipment
Connect the calibrated measuring device to the left-hand
combustion test point by unscrewing the screw and removing
the blanking cover.
Operation 3 - Adjusting the CO2 at maximum output
Draw off the domestic hot water at the maximum water fl ow
rate.
Select
the
RESET button for 10 seconds.
WARNING! When the cleaning function is activated, the
temperature of the water coming out of the boiler may be
more than 65°C.
The following icon appears on the
display:
the C.H. maximum power)
Press the
icon:
(D.H.W. maximum power)
Wait 1 minute for the boiler to stabilise before carrying out the
combustion analyses.
Read the CO2 value (%) and compare it with the values given
in the table below
N.B.: values with the casing closed.
If the CO2 value (%) read differs from the values given in the
table, then adjust the gas valve following the instructions
below, otherwise move directly onto operation 4.
Adjusting the gas valve at maximum output
Adjust the gas valve by turning setting screw 4 clockwise in
increments to reduce
the CO2 level (a 1/4 turn
adjusts the CO2 level by
approximately
Wait 1 minute after each
change in setting for the
CO2 value to stabilise.
If the value measured
Fig. 4.3
corresponds
value given in the table,
adjustment is complete,
otherwise
setting procedure again.
N.B. The TEST function is automatically deactivated after 10
minutes or manually by briefl y pressing the RESET button.
4. commissioning
(domestic hot water)
Cleaning
function
(gas boiler activated at
button to select the
EGIS HE
MAX
Gas
G20
9.4 (+/- 0.2)
Fig. 4.4
0.2%).
to
the
start
the
by
pressing
the
MIN
9.3 (+/- 0.2)
31
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