Italtherm 35 K, Руководство по установке, Страница: 35 / 56

Green Heating Technology
35
Combustion test
if
burner and exchanger cleaning
is foreseen, carry it out before testing the combustion (see
"Combustion group cleaning and check" on page 30.
To perform the test you need a flue analyser,
correctly calibrated (in the condensing boil -
er, the precision and the correctness of the
measures is particularly important). Then,
through a suitable function on the panel, we
ignite the burner, first with a reduced flow
and then at the maximum flow, doing the
measure and adjustments in both conditions.
Proceed as follows:
1. the boiler should be electrically pow -
ered and set in OFF . Use the button
if necessary (only has to be dis-
played on the screen);
2. on the flue flange, unscrew the screw 1 and move the tapping insert 2 in such
a way to tap the intake plug A only; insert the analyser probe in the flue plug F ,
taking care of the seal of the connection;
Remark: The sensor placed at the top of the probe must be placed as possible in
the centre of the flow outlet: we advise you to insert well the probe and so to
extract it of 3 cm. Insert the probe so that the protection bow of the sensor, placed at the top, is
transversal (the flow must pass through it and directly touch the sensor).
3. set the boiler in a status different from (e.g. in Winter mode);
4. generate a heating request by activating the room thermostat or by opening a DHW faucet (consist -
ent with the boiler's status).
Be sure that the heat produced by the boiler can be eliminated by the heating system (through
the radiators and/or radiant panels/floor systems) or by the water.
5. activate the boiler to its minimum output not modulated (Qr) , by entering the technician menu
and setting the parameter 12 to value 2 (see also "PCB parameters settings (technician menu)" on
page 31);
6. Wait for the boiler to stabilize (about 5 minutes) then check, referring to the table, that the meas -
ured CO
2
value at Qr is within the allowed range;
Mod� Heat input
Natural gas G20 Commercial propane G31
CO
2
at Qn
and ignition (%)
CO
2
at Qr
(%)
CO
2
at Qn
and ignition (%)
CO
2
at Qr
(%)
25
30
35
Nominal value 9.1 9.3 10.1 10.1
Allowed range 8.2 … 9.7 8.4 … 9.6 9.1 … 11.1 9.0 … 11.0
7. don't quit the technical menu and activate the boiler to its maximum output not modulated (Qn) ,
changing the value of the parameter 12 to 1 , wait for the boiler to stabilize and check, referring to
the table, that the measured CO
2
value at Qn is within the allowed range;