Electrical Connections - Sit 836 TANDEM Instructions D'utilisation Et D'installation

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 24 VAC versions must be powered at safety extra-low voltage according to EN 60742.
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. The use of the optional
connectors is recommended.
WARNING: To ensure that the gas valve unit is always included in the ground connection circus of the appliance,
it is recommended that the supply plug which contains the ground connection is always mounted and protected
against loosening by the screw.
Wiring diagrams
EV 1 EV 2
V~
SETTINGS AND ADJUSTMENTS (fig. 3)
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 the correct voltage.
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.
Gas family change
Check that the appliance is suitable for operation with the gas family in question.
Following the instructions given in this catalogue, adjust the minimum and maximum outlet pressures in accordance
with the values given in the appliance instruction booklet.
With gas of the third family:
block the adjustment of the gas flow to the burner pilot (versions with pilot outlet) by proceeding as follows:
• screw the "PILOT" adjustment screw fully in
6
• then unscrew it two complete turns
• seal the adjustment.
Shut-off automatic valves
EV EV
1 2
COM
Step modulating device
The step modulating device must be supplied with
rectified double semi-wave AC. For this purpose the
use of connector type 350, including rectifing circuit, is
recommended. Alternatively the supply circuit of the
step modulating device must include a diod bridge and
a protective damping device (e.i. VDR) in accordance
SMD
with current and voltage values.