Adjusting The Burner Ignition; Adjustment Of Useful C.h. Output - Biasi RIVA COMPACT M90E.24S User Manual And Installation Instructions

Commissioning
10 Check the minimum gas pressure and com-
pare the value on the gauge with the value indi-
cated in the sections 4.5, 4.6 or 4.7 (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.
14 Check the ignition gas pressure by setting
dip --- switch "3" (Fig. 7.7) to the OFF position.
Compare the value on the gauge with the value
indicated in the sections 4.5, 4.6 or 4.7 (gas
pressures 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.
15 Switch off the boiler, turn off the hot water tap(s)
and disconnect the pressure gauge.
If the maximum and minimum gas pressures
measured above are not in accordance with the
technical data (sections 4.5, 4.6 or 4.7 ) then ad-
justment 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 pres-
sures are adjusted then the ignition gas pres-
sure 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.
7.7

Adjusting the burner ignition

1 Turn off the boiler by means of the fused spur
isolation switch provided adjacent to the ap-
pliance.
2 Make sure that the function selector 8 is set to
the position in Fig. 7.5 and that the timer selec-
tor switch and room thermostat, if fitted, is set
to "demand heat".
30
Fig. 7.5
3 Unscrew the gas valve's outlet pressure test
point 37 (Fig. 7.4) and connect a pressure
gauge.
4 Loosen the screws B and remove the service
panel (Fig. 7.6).
B
Fig. 7.6
5 Turn on the boiler.
6 Check that the boiler lights up uniformly and
adjust the ignition gas pressure, if necessary.
To adjust the ignition gas pressure, set dip --- switch
"3" (Fig. 7.7) to the OFF position and adjust poten-
tiometer marked "ACC" with a screwdriver until
correct ignition gas pressure is obtained.
8