8
ELECTRICAL CONNECTIONS
General precautions
All electrical connections must be made in accordance with current electrical standards. Check that the supply
voltage and frequency conform with those specified on the valve label. Check that all connections, in particular the
earth, are made properly. With the versions powered by mains voltage, the electrical connections must be made using
suitable connectors.
In particular, to ensure that the valve is always connected to the earth circuit of the appliance, it is necessary for the
EV2 power connector, which includes the earth terminal, to be used at all times and the screws protected against
slackening.
The 24 Vac versions must be powered by an insulating transformer (at very low safety voltage in accordance with EN
60742). To connect these versions, use terminals AMP 6.3x0.8 DIN 46244 as an alternative to the connectors.
Make the connections as specified in the technical instructions of the flame failure device used and/or in the specific
standards for the appliance.
The electrical safety shut-off devices (for example, the flame failure device, the thermostat and so on) must cut off the
power supply to both solenoid valves simultaneously.
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.
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 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 on to the flanges and
then the flanges to the valve. Recommended torque or 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.
CAUTION: if the pilot outlet is not used it must be sealed using plug code no. 0.972.041. Torque: 7 Nm.
Connection to the pneumatic control signal (AIR IN)
This must be carried out so that danger conditions cannot be generated due to demand for gas in the absence of air
flow.
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In the versions of multifunctional controls with the air-in on the bottom of the valve, secure the hose nipple 0.958.057
to the threaded outlet. In the version of multifunctional control with the air-in on the top of the valve, secure the hose
directly to the point marked with AIR IN. Tightening torque: 1 Nm. Connect the control signal to the nipple by means
of a 6 Ø mm hose.
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To guarantee the correct operation of certain appliances, the breather hole of the multifunctional control could have
the diameter larger than 0.56 mm. It is recommended to check the characteristics of the multifunctional gas control
and if it is necessary to install the multifunctional control in order to vent the breather hole to a safe (ventilated)
place or to connect with a metallic tube.
CAUTION: On completing all mechanical connections, check for gas leakage.
SETTINGS AND ADJUSTMENTS
All adjustments must be made on the basis of the specific characteristics of the appliance, and only after having
installed the valve on the appliance. Check inlet and outlet pressure using the pressure test points provided E and A.
After testing, carefully seal test points with the provided screws. Recommended torque: 2.5 Nm.
All adjustments must be carried out in the following order.
Zero adjustment (offset)
