Adjusting The Burner Ignition - Biasi RIVA PLUS M90D.24S User Manual And Installation Instructions

Commissioning
1 Remove the front panel of the case (see sec-
tion 9.2 in this manual).
2 Loosen the internal screw 37 (Fig. 7.5) on the
Outlet Pressure Test Point of the Gas Valve and
connect a pressure gauge using a suitable
hose.
3 Set the d.h.w. and c.h. temperature control
knobs to their maximum position.
4 Switch on the boiler and open at least one hot
water tap fully.
5 Check the maximum gas pressure and com-
pare the value on the gauge with the value indi-
cated in the sections 4.4 or 4.5 (gas pressures
at the burner), accordingly with the model of
boiler installed.
6 Check the maximum gas flow at the gas meter
and compare the value indicated in the sec-
tions 4.4 or 4.5 (gas rate), accordingly with the
model of boiler installed.
7 Switch off the boiler.
8 Disconnect the gas modulator coil by remov-
ing the electrical connector A (Fig. 7.5).
37
Fig. 7.5
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 4.4 or 4.5 (gas pressures
at the burner), accordingly with the model of
boiler installed.
11 Switch off the boiler and re--- connect the elec-
trical connector A to the modulator coil.
12 Access the main control panel (see section
6.10, follow steps 2 --- 5)
13 Switch on the boiler.
32
14 Check the ignition gas pressure by setting
15 Switch off the boiler, turn off the hot water tap(s)
If the maximum and minimum gas pressures
measured above are not in accordance with the
technical data (sections 4.4 or 4.5) 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.
A
7.7
1 Turn off the boiler by means of the fused spur
2 Make sure that the function selector 8 is set to
Fig. 7.6
3 Unscrew the gas valve's outlet pressure test
dip--- switch "3" (Fig. 7.8) to the OFF position.
Compare the value on the gauge with the value
indicated in the sections 4.4 or 4.5 (gas pres-
sures at the burner), accordingly with the
model of boiler installed.
If the ignition gas pressure is not set correctly
see section 7.7 in this manual for the adjust-
ment procedure. If ignition gas pressure is cor-
rect switch dip--- switch "3" to the ON position.
and disconnect the pressure gauge.

Adjusting the burner ignition

isolation switch provided adjacent to the ap-
pliance.
the position in Fig. 7.6 and that the timer selec-
tor switch and room thermostat, if fitted, is set
to "demand heat".
point 37 (Fig. 7.5) and connect a pressure
gauge.
8