Checks; Removal Of The Gas Valve - Biasi RIVA ADVANCE HE M110B.24SM/C Service Manual

Gas valve
E F
Fig. 11.4
15 Keep pressed the reset button C for about 10
seconds (Fig. 11.4) until the lock ---out signal
lamp D blinks.
16 The lamps E should give the indication as in
Fig. 11.5.
Where:
Fig. 11.5
17 Release and keep the reset button C pressed for
more than 5 seconds until the lock ---out signal
lamp D is switched off.
The boiler will now go through an ignition se-
quence and the burner will light.
18 Open at least one hot water tap fully.
Adjusting minimum gas valve setting
19 Set the knob F to the minimum position as illus-
trated in Fig. 11.6.
E F
Fig. 11.6
20 Allow the analyser to give a stable reading.
21 Read the CO % value.
2
It should be between 9,0 and 9,8 % (natural gas
G20) or between 10,0 and 11,0 % (LPG G31).
To adjust the CO
2
by unscrewing it and rotate the Allen key screw ø
4 mm (2 --- Fig. 11.2) (by rotating it clockwise the
CO % increases).
2
Checking the maximum gas valve setting
22 Set the knob F to the maximum position as illus-
trated in Fig. 11.7.
28
B
C D
Lamp OFF
Lamp ON
B
C D
% value remove the brass plug
E F
Fig. 11.7
23 Allow the analyser to give a stable reading.
24 Read the CO % value.
2
It should be between 9,0 and 9,8 % (natural gas
G20) or between 10,0 and 11,0 % (LPG G31).
To adjust the CO
Fig. 11.2) (by rotating it clockwise the CO
creases).
25 Switch off the boiler and turn off the hot water
tap(s).
26 Close the air---flue sampling points.
27 After adjustment fit the protective brass plug (2,
Fig. 11.2).
Important: after the gas pressure checks and any
adjustment operations, all of the test points must be
sealed.
11.4

Checks

Warning: isolate the boiler from the mains
electricity supply
covering or component.
Check the on---off operators coils
n
1 Remove the front panel of the case.
2 Disconnect the electrical connector 4 (Fig. 11.2).
3 Measure the electrical resistance between the
connector pins of the on---off operators as illus-
trated in Fig. 11.8.
ON---OFF Operator
approx. 6 400
*
ON---OFF Operator
approx. 920
*
* at ambient temperature.
Fig. 11.8
11.5

Removal of the gas valve

Warning: isolate the boiler from the mains
electricity supply
covering or component.
1 Remove the front panel of the case as explained
in the section 2.3 of this manual and the sealed
chamber lid.
2 Remove the screw G and disconnect the con-
nector H (Fig. 11.9).
B C D
% value rotate screw (1 ---
2
before removing
before removing
% de-
2
any
any