First Start-Up - Madas XVO/NC Serie Manual Del Usuario

3.3 - INSTALLATION IN PLACES WHERE THERE IS THE RISK OF EXPLOSION (DIRECTIVE 2014/34/EU)
The solenoid valve complies with Directive 2014/34/EU as a device of group II, category 3G and as device of group II, category
3D; consequently, it is suited for installation in zones 2 and 22 as classified in Annex I of Directive 99/92/EC. The solenoid
valve is NOT suitable for use in zones1, 21, 0 and 20, as defined in aforementioned Directive 99/92/EC. To determine the
qualification and size of the hazardous zones, please refer to standard IEC EN 60079-10-1.
If installed and subject to maintenance in full compliance with all conditions and technical instructions provided in this manual, the
device does not pose a source of specific hazards: in particular, under conditions of normal operation, it is not expected for the
solenoid valve to emit a flammable substance into the atmosphere with methods such as to originate an explosive atmosphere.
During installation and maintenance, it is imperative to comply with the Ex standards, in particular EN 60079-14. Electrical
installation must be carried out by authorised personnel in accordance with relative national regulations.
Do not install the appliance in explosive atmospheres except for the specified gas and dust groups and areas (as explained
in section 2.0).
The subsequent application of a non-conductive coating with a thickness of > 0.2mm on the external surface prohibits its use
in environments with potentially explosive atmospheres where group IIC Gases are present. The thickness of the coating must
be < 2mm for group IIB.
For group III it is necessary to take appropriate precautions to prevent the accumulation of electrostatic charges (e.g. cleaning
with an antistatic cloth, etc.).

4.0 - FIRST START-UP

• Before start-up make sure that all of the instructions on the rating plate, including the direction of flow, are observed;
• After having gradually pressurized the system, check the seal and operation of the solenoid valve, by powering /
disconnecting it electrically.
IMPORTANT NOTE: Do not use the connector as a switch to open / close the solenoid valve.
4.1 - RECOMMENDED PERIODIC CHECKS
• Check tightness of the flanged/threaded connections on the system;
• Check tightness and operation of the solenoid valve;
• Clean the product regularly to prevent dust from building up;
• It is essential to eliminate the risk of ignition caused by stray currents or any condition of potential difference between the
devices fitted on the system. Periodically check that there is good electrical conduction between the valve body and the
equipotential plant line and between the coil and the equipotential plant line.
It is the responsibility of the final user or installer to define the frequency of these checks based on the severity of the service
conditions.
4.2 - ADJUSTMENT (XVOF/NC - XVOAF/NC Models)
• The flow adjustment (if present) can be done with the system in operation and the valve powered. It is recommended
to use suitable thermal protections for hands.
• To make this adjustment you need to unscrew the screw (7) and turn the adjustment screw (9). When you are finished, screw
on and set the screw (7) in its original position.
XVO.../NC - XVOA.../NC
12
Madas Technical Manual - 1|1.1X - REV. 1 of 6 Jul 2020
th