Gas valve
23
Fig. 8.9
22
Allow the analyser to give a stable reading.
23
Read the CO
2
% value.
It should be between:
Model
Type gas
CO
2
% value
(range)
Activ A 12OV
Activ A 15OV
Natural (G20)
8,9--- 9,8
ct
5O
Activ A 20OV
Activ A 25OV
Propane (G31)
9,9 --- 10,8
Tab. 8.2
To adjust the CO
2
% value rotate screw (1 --- Fig. 8.2)
(by rotating it clockwise the CO
2
% decreases).
24
Press keys A --- B --- C (Fig. 8.5) at the same time
again to exit the ”chimney sweep mode” and re-
turn to the previously set boiler status (Fig. 8.10)
C.h.
function
Fig. 8.10
25
Switch off the boiler and turn off the room ther-
mostat.
26
Close the air---flue sampling points.
27
After adjustment fit the protective brass plug (2,
Fig. 8.2).
Important: after the gas pressure checks and any
adjustment operations, all of the test points must be
sealed.
8.4
Checks
Warning: isolate the boiler from the mains
electricity supply before removing any
covering or component.
n
Check the on---off operators coils
1
Remove the front panel of the case.
2
Disconnect the electrical connector 4 (Fig. 8.2).
3
Measure the electrical resistance between the
connector pins of the on---off operators as illus-
trated in Fig. 8.11.
ON---OFF Operator
approx. 920
Ω
*
ON---OFF Operator
approx. 6 400
Ω
*
* at ambient temperature.
Fig. 8.11
8.5
Removal of the gas valve
Warning: isolate the boiler from the mains
electricity supply before removing any
covering or component.
1
Remove the front panel of the case as explained
in the section 2.3 of this manual.
2
Disconnect the connector
D
(Fig. 8.12).
3
Unscrew the screws
E
and disconnect the earth
connector
F
.
I
D
G
H
J
I
K
E
F
Fig. 8.12
4
Turn off the gas supply and disconnect the gas
isolation cock connector from the inlet port of the
gas valve.
5
Using pliers, remove the spring
G
and the rubber
pipe
H
(Fig. 8.12).
6
Unscrew the connectors
I
(Fig. 8.12) and remove
the pipe
J
.
7
Unscrew the screws
K
and remove the valve
(Fig. 8.12).
8
Reassemble the valve carrying out the removal
operations in reverse order.
Before fitting a new valve, it is advisable to pre--set
it as follows.
9
Remove the brass plug and turn the plastic screw
inside it fully clockwise until it stops. Do not over-
tight.
10
Turn it counter---clockwise 2 and 3/4 turns.
