Important - Sit 848 Sigma Instructions D'utilisation Et D'installation

Pressure regulating function
This is obtained by means of a servo pressure regulator.
Pressure regulator
Maximum pressure difference Pout-Pair
with closed shut-off valves
Minimum gas flow
Capacity @ 5 mbar pressure drop
Gas-air modulating function
The servo pressure regulator also incorporates a 1:1 gas-air ratio modulating control. 848 SIGMA
keeps the pressure Pint equal to the air pressure signal Pair, increasing or decreasing according to
the value adjustment with the offset screw.
Furthermore it is possible to fine adjust the CO 2 value of the appliance by mean of the Ratio
Adjustment screw (see SETTINGS AND ADJUSTMENTS clause).
Air signal connection port
Zero adjustment (offset) range
Response time
INSTALLATION
848 SIGMA conforms to current safety standards. Installation in appliances must nevertheless be
checked with respect to the specific installation requirements for the appliance. In particular it is
necessary to check the requirements related to the number and class of the automatic shut-off valves.
WARNING
CONDENSATION, FORMATION OF ICE AND INGRESS OF WATER ON
THE GAS VALVE ARE NOT PERMITTED.
WARNING
SIT 848 SIGMA MUST bE USED SO THAT THERE CAN bE NO GAS
DEMAND IF THERE IS NO AIR FLOW.
WARNING
THE INSTALLATION SHOULD AVOID THE POSSIbILITy OF
DISCONNECTION OR CLOGGING OF THE AIR SIGNAL LINE.
All the installation, setting and adjustment operations must be carried out exclusively by qualified
personnel and on the basis of the specific characteristics of the user appliance and following the
instructions given in this booklet.
All other operations are absolutely forbidden.

IMPORTANT

Do not tamper with sealed parts
Fig.2
Class B
-12 to +12 mbar
0.4 m 3 /h for 2 nd family gas (G20)
0.25 m 3 /h for 3 rd family gas (G31)
More than 2.8 m 3 /h (G20)
Do not remove labels
Only remove dust caps when installing (dust caps do not
guarantee sealing)
Do not exceed recommended torques
Use only the specified spanner grips shows in Fig.2 when
making the connections
Turn off gas supply before starting installation
Ø 6 mm
-0.3 to 0.3 mbar
less than 2 seconds
5 5