7
• 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
• Do not subject the valve to bending in excess of 35 Nm and
torque in excess of 25 Nm
• Use only the specified spanner grips when making the
connections
• Do not immerse in water or subject the valve (MFC) to
temperatures exceeding 80°C
• Turn off gas supply before starting installation
INSTALLATION
SIT 840 SIGMA complied 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 adjustement operations must be carried out exclusively by qualified personnel on the
basis of the specific characteristics of the appliance.
MECHANICAL CONNECTIONS
General recommendations:
SLOW OPENING LEVEL ADJUSTMENT
The adjustment is carried out by rotating the adjustment screw. This can rotate up to 270° and every position
corresponds to a specific ignition level. (This is also affected by the outlet pressure level).
The 0° position is obtained by rotating anticlockwise the screw up to the stop position, this then corresponds with the
minimum ignition level. The 270°C position is obtained by rotating clockwise the adjustment screw up to the stop
position and this then corresponds with the maximum level.
The adjustment procedure:
- Ensure that the flame control is the correct version.
- Using a screwdriver, turn the adjustment screw up to the stop position (0°)
- Rotate the adjustment screw anticlockwise to the specific angle required.
- Power the control to activate the ignition procedure
- Verify the ignition conditions
- Disconnect the supply
- Rotate, if necessary the adjustment screw and repeat the process to obtain the optimal situation for the ignition of
the boiler.
WARNING
:
If the gas family could be changed it is necessary to reset the slow opening adjustment.
0
0
1
2
3
4
5
6
7
8
9
10
t (sec.)
2
4
6
8
10
12
14
16
Pout (mbar)
270
°
180
°
0
°
ENGLISH
