Mechanical Connections; Electrical Connections; Wiring Diagrams - SIT Group 820 NOVA Manual De Instrucciones

INSTALLATION
SIT 820 NOVA 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 class of flame failure device, automatic shut-off valve and 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 valve is not suitable for outdoor use.

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
gettinginto the valve during installation. In particular, check the cleanliness of the inlet and outlet pipes.
Do not subject the valve to bending in excess of 35 Nm and to torquein excess of 25 Nm. Use only the specified
spanner grips when making the connections.
Main gas connection
The connection must be made using gas pipes with Rp 1/2 ISO 7. Torque: 25 Nm. If, alternatively, flanges (available
on request) are used, first screw the pipes onto the flanges and then the flanges to the valve. Recommended torque
for flange fixing screws: 3 Nm.
Connection to the pilot burner
ø 4 mm, ø 6 mm or ø 1/4" pipes can be used. Use appropriately sized nut and olive. Tighten to 7 Nm torque.
Connection to the combustion chamber
Connecting the pressure regulator to the combustion chamber is recommended if this is under pressure. For this
purpose the use is recommended of fittings code no. 0.958.057 or 0.958.058, depending on the specifications of the
user appliance. Torque: 1 Nm.
CAUTION : after making the gas connections, check seals and ensure appliance works properly.

ELECTRICAL CONNECTIONS

General precautions
All electrical connections must be made in accordance with current electrical standards. Check that the voltage and
frequency of the coils, given on the valve, are correct. Check that all connections, in particular the earth, are made
properly. The use of the special connectors is recommended for the connection of versions powered by the mains
voltage. In particular, to ensure that the valve is always connected to the appliance's earth circuit, it is recommended
that the automatic valve (EV) power connector, which includes the earth, is always used and protected from any
slackening by the fixing screw. The 24 VAC versions must be powered by an insulating transformer (at very low safety
voltage to EN 60742 standards). For the connection, use AMP 6.3x0.8 mm DIN 46244 terminals. Make the
connections according to the specific standards for the appliance. All the safety shut-off devices (for example, the
overheat thermostat and so on) must cut off the power supply to the magnet unit.

WIRING DIAGRAMS

AC-powered versions
V~
2
6
8
10 12
room thermostat
V~
7