Green Heating Technology
29
Venting the primary exchanger
When commissioning and cleaning the combus
-
tion unit, it is a good idea to check that there is no
air in the primary circuit of the combustion unit
and, if necessary, to eliminate it by opening the
valve
4
located on the top of the unit.
f
To avoid wetting the sealed chamber insude,
use a length of flexible hose
1
, with suitable
diameter, on the fitting
2
;
f
slowly open the venting valve by manually
turning the ferrule
3
counterclockwise;
f
when no more air comes out, close the vent
-
ing valve by manually turning the ferrule
3
clockwise, without forcing excessively.
Venting the storage coil
1.
Put the boiler in stand-by turning the “Summer/Winter” knob
on
(green lamp flashing);
Remark: during this procedure, that requires the activation of the
boiler in DHW, it's necessary that the storage is cold or anyway
at a temperature lower than the setting: if necessary, enter cold
water in the storage by opening one of the hot water taps with
the boiler in stand-by.
2. insert a rubber hose
12
on the hose connection of the manual
venting valve
11
of the storage coil, and lead the other end of the
hose to a suitable drain;
3.
gradually open the manual venting valve
11
: from the hose, water
and air will go out (check that there are no water leaks on the
hose connection side);
4.
gradually open the system filling cock (located on the boiler lower
side);
5.
close the system filling cock and the manual venting valve
11
as
soon as only water flows out of the hose;
6.
adjust the system pressure to the optimal value of
1.0 bar
(max
1.5 bar)
by using the filling cock (to increase) or the manual vent-
ing valve
11
(to decrease);
7. turn the Summer/Winter knob
fully clockwise (max heating)
and activate the room thermostat;
8.
the boiler will start working in heating mode; wait one minute,
then activate the boiler in DHW mode by turning the Hot Water
knob
fully clockwise to the end of the scale
(max DHW
temperature);
9.
after a minute of working in DHW, put the boiler back in stand-by turning the “Summer/Winter”
knob
on
(green lamp flashing) and put the storage in stand-by too by turning the Hot
Water knob on
;
10.
open the manual venting valve
11
again and let air and water go out from the rubber hose
12
;
