Checking The Burner Ignition - Biasi GARDA HE SYSTEM M96.28SR/P User Manual And Installation Instructions

Commissioning
fitted (e. g. Timeclock, room thermostat) en-
sure they "call for heat".
4 Switch on the boiler.
5 Check the maximum gas pressure and com-
pare the value on the gauge with the value indi-
cated in the sections 4.5 or 4.6 (gas pressures
at the burner).
6 Check the maximum gas flow at the gas meter
and compare the value indicated in the sec-
tions 4.5 or 4.6 (gas rate).
7 Switch off the boiler.
8 Disconnect the gas modulator coil by remov-
ing the electrical connector A (Fig. 7.4).
35
Fig. 7.4
9 Switch on the boiler.
10 Check the minimum gas pressure and com-
pare the value on the gauge with the value indi-
cated in the sections 4.5 or 4.6 (gas pressures
at the burner).
11 Switch off the boiler and re--- connect the elec-
trical connector A to the modulator coil.
12 Switch on the boiler.
13 Check that the boiler lights up uniformly.
If not refer to section "Ignition gas pressure ad-
justment" of the Service Manual for the necess-
ary adjustment procedures.
14 Switch off the boiler and disconnect the pres-
sure gauge.
32
If the maximum and minimum gas pressures
measured above are not in accordance with the
technical data (sections 4.5 or 4.6) then adjust-
ment will be necessary. A full explanation of the
gas pressure adjustment procedure is given in
the Gas Valve section of the service manual. If
maximum and/or minimum gas pressures are
adjusted then the ignition gas pressure must
be checked and adjusted if necessary.
Important: after the gas pressure checks and
any adjustment operations, all of the test points
and adjustment devices must be sealed. Re-
place the adjustment protection cap.
7.7

Checking the burner ignition

1 Turn the boiler OFF
2 Open the gas valve outlet pressure test point
35 (Fig. 7.4) and connect the gauge.
3 Turn the boiler ON positioning the control se-
lectors 7 in the positions as shown in Fig. 7.5
and ensure that the timer selector switch and
room thermostat, if fitted, are set to "heat de-
mand".
9
A
Fig. 7.5
4 Watch the gauge and check to see if the igni-
tion pressure registered corresponds to the va-
lues as given in the Technical Data. Turn off the
boiler and reignite it by turning the function se-
lector 7 to the OFF position and then back to
that indicated in Fig. 7.5.
5 Repeat this process two to three times leaving
30 second intervals between each ignition.
Check the ignition pressures and visually
check that the burner lights uniformly and in a
controlled manner.
6 If the burner ignition is not uniformly controlled
then checks should be made to:
--- the flue installation and termination.
--- that the flue gasket as shown in Fig. 6.5 page
22 is in place.
7