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To adjust the CO
% value rotate screw (B - Figure 11.2) (by rotat-
2
ing it clockwise the CO
% decreases).
2
24 Press keys G - H - I (Figure 11.5) at the same time again to
exit the "chimney sweep mode" and return to the previously
set boiler status (Figure 11.10)
C.h. / d.h.w. function
figure 11 .10
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 (C - Figure 11.2).
important: after the gas pressure checks and any adjust-
ment operations, all of the test points must be sealed .
11 .4 checks
warning: isolate the boiler from the mains electrici-
ty supply before removing any covering or compo-
nent .
Check the on-off operators coils
1 Remove the front panel of the case.
2 Disconnect the electrical connector E (Figure 11.2).
3 Measure the electrical resistance between the connector pins
of the on-off operators as illustrated in Figure 11.11.
Upper on-off operator
approx. 6400 *
Lower on-off operator
approx. 920 *
*at ambient temperature.
figure 11 .11
11 .5 removal of the gas valve
warning: isolate the boiler from the mains electrici-
ty supply before removing any covering or compo-
nent .
1 Remove the front panel of the case as explained in the sec-
tion 2.3, of this manual.
2 Disconnect the connector L (Figure 11.12).
- 34 -
gas valve
n
O
m
figure 11 .12
3 Turn off the gas supply and disconnect the gas isolation cock
connector from the inlet port of the gas valve.
4 Using pliers, remove the spring O and the rubber pipe P (Fig-
ure 11.12).
5 Unscrew the connector N, remove the fixing fork J and re-
move the pipe K.
6 Unscrew the screws M and remove the valve.
7 Reassemble the valve carrying out the removal operations in
reverse order.
warning: be careful not to damage the Or gasket of
the gas pipe when inserting the pipe in the air box
(air/gas mixer) .
Before fitting a new valve, it is advisable to preset it as fol-
lows .
8 Remove the brass plug and turn the plastic screw inside it
fully clockwise until it stops. Do not overtight.
9 Turn it counter-clockwise 2 and 3/4 turns.
10 Adjust the gas valve using the flue analyser as described in
section 11.3.
after any service operation on the components of the gas
circuit check all the connections for gas leaks .
warning: after cleaning or replacement as detailed
above, it is deemed necessary to undertake a com-
bustion analysis as detailed in section 11 .3 .
J
K
p
l
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