Sit 848 Sigma Instructions D'utilisation Et D'installation page 11

value and in case calibrate using the screw B.
NOTE: the protective plug A (Fig.12) can be furnished but not fixed to the valve.
IMPORTANT After setting put back the protective plug A, disconnect the manometer and
reconnect the air pipe, if any, to the air signal connection port G.
Depending on the appliance characteristics, small angle rotation of the Ratio
Adjustment screw can bring to large CO/CO 2 and CO 2 variation.
Make sure that the natural lifetime offset drift of the valve is compatible with
the CO 2 limits of the appliance particularly at the minimum power.
Gas family change
Check that the appliance is suitable for operation with the gas family in question. Adjust the
settings in accordance with the values given in the appliance instruction booklet only after having
changed the gas injector of the appliance.
Changing gas group within the same family
Check that the appliance is suitable for operation with the gas group in question. Check in the
appliance instructions if any operations are necessary when changing the gas group. Finally
adjust the settings in accordance with the values given in the appliance instruction booklet, as
stated previously.
IMPORTANT At the end of all setting and adjustment operations, check electrical
insulation, gas seals and the safety 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 vent orifice inside
the air signal connection port, see picture below.
Make sure that the vent plug (see picture below) is fitted. If not present,
Vent
Plug
vent orifice
(inside)
QUALITy ASSURANCE STATEMENT
Products are manufactured, assembled and tested to an approved technical specification and are
released by quality assurance within the SIT quality management system assessed to ISO 9001(*).
(*) Updated Certificates can be downloaded from SIT Group website
http://www.sitgroup.it/content/view/425/194/
insert the original plug. The
correct operation of the valve is
not guaranteed when the vent
plug is not fitted.
Do not operate with compressed
air near the zone of Pair
connection.
Finally ensure that the burner
operates properly and according
to the appliance instructions at
the minimum and maximum
Pair
power of the appliance.
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