Mechanical Connections; Electrical Connections; Settings And Adjustments - Sit 827 NOVA Manual Del Usuario

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 multifunctional control body. Prevent foreign matter from getting into the
multifunctional control during installation. In particular, check the cleanliness of the inlet and outlet pipes. Do not
subject the multifunctional control to bending in excess of 35 Nm and to torque in 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 thread. Torque: 25 Nm. If, alternatively, flanges
(available on request) are used, first screw the pipes onto the flanges and then the flanges to the multifunctional
control. Recommended torque for flange retaining screws: 3 Nm.
Connection to the pilot burner:
Ø4 mm, Ø 6 mm or Ø 1/4" pipes can be used. Use appropriately sized nut and olive. Tighten to 7 Nm torque.
WARNING: if the pilot outlet is not used it must be sealed using optional plug code no. 0.972.041. Torque: 7 Nm.
Connection to the combustion chamber (on request)
The pressure regulator should be connected to the combustion chamber when this is pressurized. For the purpose,
use fittings 0.958.057 or 0.958.058 depending on the characteristics of the user appliance. Torque: 1 Nm.

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 multifunctional control, are correct.
Check that all connections, in particular the earth, are made properly.
For main voltage versions, the use of the specified plugs and leads is recommended. In particular, to ensure that the
multifunctional gas control unit is always included in the ground connection circus of the appliance, it is necessary
that the EV2 supply plug which contains the ground connection is always mounted and protected against loosening
by the screw.
The 24 VAC versions and the step modulating solenoid must be powered at safety extra-low voltage according to EN
60742. Use fast-on type 6.3x0.8 mm terminals.
Make the connections as specified in the technical instructions for the flame failure device used and/or in the specific
standards for the appliance. The electrical safety cut-off devices (for example, the flame failure device, the thermostat
and so on) must cut off the power supply to both automatic shut-off valves simultaneously.

SETTINGS AND ADJUSTMENTS

All adjustments must be made on the basis of the specific characteristics of the appliance. Check inlet and outlet
pressure using the pressure test points provided. After testing, carefully seal test points with the provided screws.
Recommended torque: 2.5 Nm.
Adjusting the outlet pressure
Maximum pressure
Power the modulating solenoid with 165 mA Dc or 310 mA depending on the versions.
Turning the nut (B) clockwise (using a 10 mm spanner), the outlet pressure increases.
Minimum pressure (adjust only after setting the maximum outlet pressure)
Turn off power supply to modulating solenoid.
Keeping nut (B) blocked using a spanner, turn the screw (A) clockwise to increase the outlet pressure.
After completing the adjustments:
- check the minimum and maximum pressure values, readjust if required
- fit the plastic cap C.
Adjustment of gas flow to the pilot burner
Turn the "Pilot" screw clockwise to reduce flow.
IMPORTANT: At the end of all setting and adjustment operations, check electrical insulation, gas seals and the
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efficiency of the appliance. After carrying out all adjustments, fit the provided seals and/or block the setting screws
with paint, taking care not to obstruct the orifice of the pressure regulator.