34
S
UPPLY
P
RESSURE
G20 methane
17-25 mbar
1
3
2
4
2
4
3
1
3.6.3 G
AS REGULATION CHECK
Supply pressure check
1. Loosen screw “
1
” (Fig. 3.31) and conect the pressure gauge
connection pipe into the test point.
2. Turn the boiler on at maximum power, enabling the “flue
sweep” function (press the RESET key for 5 seconds and
press the programming keys + and - together). The supply
pressure should correspond to that shown for the type of gas
the boiler is designed for methane gas G20.
3. When the check is over, tighten screw “
1
” and make sure it is
securely in place.
4. Disable the test mode by pressing the reset key.
Air/gas ratio at minimum power
To check the air/gas ratio at minimum power, proceed as follows:
1. Connect the combustion analyser to the analysis point (Fig.
3.30) after removing the cover plate.
2. Turn the boiler on at minimum power via the test function
(see paragraph 3.6.1) or by pressing RESET key for 5
seconds and the programming key - on the control panel.
Ensure the CO
2
value on the analyser corresponds with the
value indicated in table 4D. If this is not the case, adjust
screw
“2”
(Fig.3.31) with a screwdriver, after removing the
cap, until you obtain the correct CO
2
reading. Allow the
reading to become stable for at least 4 minutes.
3. When the check is over, replace the cap on screw “
2
” (Fig.
3.31).
4. Disable operation at minimum power by pressing the RESET
key.
Air/gas ratio at maximum power
To check the air/gas ratio at maximum power, proceed as
follows:
1. With the combustion analyser already connected to the
analysis point, set the boiler to maximum power via the test
function (see paragraph 3.6.1) or enabling the “flue sweep
function” by pressing the RESET key for 5 seconds and the
programming keys + and -.
Ensure the CO
2
value on the analyser corresponds with the
value indicated in table 4D. If this is not the case, adjust
screw “
4
” with a screwdriver (Fig. 3.31), until you obtain the
correct CO
2
reading. Allow the reading to become stable for
at least 4 minutes.
2. Disable the test mode by pressing the RESET key.
The test mode is automatically disabled after 5 minutes.
3.
Repeat the air/gas ratio at minimum power check (see
above).
4. Disconnect the analyser, remount the cover plate and check
it is securely in place.
A
IR
/
GAS RATIO SETTING
Calibration values check
CO
2
at maximum power
% vol
8,7 ±0.2
after 4 minutes of operation
methane G20
A
IR
/
GAS RATIO SETTING
Calibration values check
CO
2
at minimum power
% vol
9,2 ±0.2
after 4 minutes of operation
methane G20
A
IR
/
GAS RATIO CHECK
F
IG
. 3.30
F
IG
. 3.31
Summary of Contents for 47-116-09
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