Gas Valve; Function; Description Of The Parts; Adjustment - Biasi RIVA ADVANCE HE M110.24SM/C Service Manual

11

Gas valve

11.1

Function

The Gas valve A in Fig. 11.1 controls the gas inflow to
the boiler burner.
A
Fig. 11.1
By means of an electric command given to the on---off
operators the passage of the gas through the Gas valve
can be opened or closed.
11.2
Description of the parts (Fig. 11.2)
1 Minimum gas pressure adjustment
2 On---off operators
3 On---off operators electric connector
4 Gas valve inlet pressure test point
4
Fig. 11.2
24
1
3
11.3

Adjustment

Warning: isolate the boiler from the mains
electricity
covering or component.
Check the supply pressure before making any ad-
justment to the gas valve.
1 Close the gas inlet valve.
2 Remove the front panel of the case and lower the
control panel (see sections 2.2 and 2.3).
3 Loosen the internal screw on the Inlet Pressure
Test Point 4 (Fig. 11.2) of the Gas valve and con-
nect a pressure gauge using a suitable hose.
4 Open the gas inlet valve.
5 Turn on the electricity supply to the boiler, switch-
ing on the fused spur isolation switch.
The appliance operation light on the left will flash
every 4 seconds.
6 Set the function knobs as illustrated in Fig. 11.4.
7 Open at least one hot water tap fully.
8 Read the inlet pressure value and ensure that it is
within the limits given in the table Gas supply
pressures, of the user/installation manual
If it does not comply with the required pressure
check the gas supply line and governor for faults
and/or correct adjustment.
Switch off the boiler close the gas inlet valve and
9
close the water tap.
10 Disconnect the pressure gauge and close the
Inlet Pressure Test Point 4 (Fig. 11.2).
Gas valve adjustment
11 Fit the probe of the flue analyser in the flue ex-
haust sampling point located on the exhaust
pipes of the boiler (Fig. 11.3)
Fig. 11.3
2
12 Turn on the boiler, switching on the fused spur
isolation switch.
13 Open the gas inlet valve.
Set the function knob B as indicated in Fig. 11.4.
14
The appliance operation light on the left will flash
every 4 seconds.
supply before removing
air---flue exhaust
sampling points
any