Sit 828 NOVAMIX, Manual, Page: 8 / 36

8
ENGLISH
15
0
2
4
6
8
17 19 21 23 25
2
1
7
9 15
0
3
6
9
12
15
11 13 17
Q [gas] [m 3 /h, d = 0.6]
Pu [mbar]
Gas of the II family
Inlet pressure [mbar]
Gas Curve
Nominal Maximum Minimum
2H 1 20 25 17
2L 2 25 30 20
Q [gas] [m 3 /h, d = 1.7]
Pu [mbar]
Gas of the III family
Range of maximum regulated flow Q (gas)
as a function of maximum outlet pressure
Pu of gas to burner according to EN 88.
Inlet pressure [mbar]
Gas
Nominal Maximum Minimum
d=1.7 30 35 25
MECHANICAL CONNECTIONS
General recommendations
Do not tamper with sealed parts. Do not slacken assembly screws. Do not remove labels. Avoid blows (knocks, falls
etc.). Only remove dust caps when installing. Do not exceed recommended torques. Ensure that the gas flows in the
direction shown by the arrow on the valve body. Prevent foreign matter from getting into the valve during installation.
INSTALLATION
The 828 NOVAMIX control valve complies with current safety standards.
Nevertheless, its installation on appliances must be verified in accordance with the specific standards for each
installation. In particular, it is necessary to ensure that requirements relating to the number and class of the automatic
shut-off valves and to the class of the pressure regulator are met. All the installation, setting and adjustment operations
must be carried out exclusively by qualified personnel on the basis of the specific characteristics of the appliance. The
828 NOVAMIX control valve must be connected and installed so that there can be no gas demand if there is no air flow.
In particular, the possibility of clogging or disconnection of the pneumatic circuit lines must be avoided. The valve must
only be installed inside gas appliances and is not suitable for outdoor use.
OPERATION
The inlet pressure can be read at test point E with both automatic shut-off valves not energized.
Power to the automatic shut-off valve EV1 allows the gas to supply the pilot burner outlet (applications with intermittent
pilot) after passing through the inlet filter, the pilot filter and the pilot flow regulation device RQ.
With both the automatic shut-off valves energized, gas flow is opened towards the main burner. The outlet pressure can
be read at test point A. Gas outlet pressure is proportional to the differential pressure
∆ p air applied to the inlets F.
The adjustment screw Q determines the value of the outlet pressure with an inlet signal of zero (zero adjustment or
offset). The
∆ p air can be read at the test points G.