2861
7
GB
³
The tube connecting valve tap
PF
with boiler tap
A
must be positioned so that any condensate is drained into
the combustion chamber and not inside the valve.
³
The run for the pulse lines must be short.
³
It is necessary for the pulse lines not to touch the boiler since the high temperature would damage them.
³
In certain applications, where pressure measurement in the combustion chamber is inaccurate, it is neces-
sary to move the G1/8 connector from the burner flange to the boiler door. In this case, blank the flange hole.
³
Failure to do so may cause the valve to malfunction, and to be damaged.
4.3
GAS FEEDING LINE
4.4
PROBE - ELECTRODE POSITIONING
ATTENTION
³
Verify that the plate (3, fig. 8) is always inserted in the
flattening of the electrode (1).
³
Lean the probe insulator (4) against the cup (2).
TYPE
A
916M
30
917M
31
918M
31
ATTENTION
P
L
–
Air pressure at combustion head
M1
–
Gas-supply pressure test point
M2
–
Pressure point for gas measurement at
gas train outlet
M3
–
Pressure point for gas pressure meas-
urement at combustion head
1
–
Gas supply pipe
2
–
Manual cock
(charged to the installer)
3
–
Gas pressure gauge
(charged to the installer)
4
–
Filter
5
–
Gas pressure switch
6
–
Electromagnetic safety valve
7
–
Electromagnetic operating valve
8
–
Pressure governor
P
F
–
Pressure in combustion
chamber
Fig. 7
M3
D4430
1
2
M1
5
6
7
4
P
L
P
F
M2
D6088
±
0.3
3.5
±
0.3
A
Fig. 8
1
3
2
4
