SERVICING AND MAINTENANCE INSTRUCTIONS
_
9
:
MECHANICAL MINIMUM GAS PRESSURE SETTING
D
10
20
30
40
MANOMETRO
The mechanical minimum gas pressure is factory calibrated on all boilers at 17/18 mmH20.
When replacing the gas valve adjust the mechanical minimum pressure as
follows:
:
•
Using a single cut screwdriver turn
D
screw (fig.1 ) clockwise and
tight it ;
•
To adjust the mechanical minimum, turn
D
screw (fig.1)
counter-clockwise for two complete turns.
Parameter
10
setting:
MINIMUM HEATING OUTPUT SETTING
To check or modify the existing pressure value:
a.
insert a manometer into the gas valve pressure point
B
(fig.1);
Fig. 1
b.
Put ON / OFF button
1
in
OFF
position (
);
c.
Push pad
6
and
4
simultaneously and keep them pressed;
d.
Put ON / OFF button
1
in
ON
position (
) and wait until the display shows
-
;
P
0
Gas valve VK 4105G
e.
Release pad
6
and
4
;
f.
Keeping pad
5
pressed, press pad
6
and select parameter no.
;
1
g.
Release service pad
5
,
press and release service pad
5
;
h.
The display
will show the parameter value to be set or modified;
i.
The manometer inserted in the pressure point
B
(fig. 1) will show the minimum gas pressure;
j.
If that value is different than the one stated on the data plate, modify it by pressing pad
6
to increase or pad
4
to decrease
gas pressure;
k.
Push service pad
5
to confirm the setting; display will show parameter no.
;
1
l.
Once the minimum gas pressure has been adjusted, switch the boiler OFF by putting ON / OFF button
1
in
OFF
position (
);
m.
Remove the silicon pipe from the pressure point
B
(fig.1), close tightly the pressure point screw and make sure there are no gas leaks;
n.
Position the ON / OFF button
1
in ON position (
);
CONDENSING WALL-HUNG BOILER – TG05A062.A0505
29
