TECHNICAL AND FUNCTIONAL CHARACTERISTICS • Low NOx and CO emissions gas burner compliant with European standard EN676 “Classe III”. • Two-stage operation (high/low flame), the stage switch is progressive. • High ventilation efficiency, low electrical input, low noise. • Exhaust gas recycling blast-pipe able to achieve very low pollutant emissions, particularly with regard to nitrous oxides (NOx). • Maintenance facilitated by the fact that the mixing unit can be removed without having to remove the burner from the boiler. • Regulation of air flow rate for first and second stage with damper closure on standby to prevent in-flue heat dispersion. • Gas regulation by means of one stage operating valve, electrically controlled. • Possibility to chose gas train with valve tightness control. • Gas train exit from the bottom. • Equipped with one 4 and 7-pole connector, one flange and one insulating seal for boiler fastening. CONSTRUCTION CHARACTERISTICS Conform to: Gas Directive 90/396/CEE E.M.C. Directive 89/336/CEE L.V. Directive 73/23/CEE Reference standard: EN676 Electrical supply The burner consists of: • Air intake with butterfly gate for the regulation of the air combusting flow rate. • Sliding boiler coupling flange to adapt the head protrusion to the various types of boilers. • Air pressure switch to ensure the presence of combustion air. • Air flow regulation for first and second stage by means of electric servomotor. • Flame detection by ionisation electrode. • Automatic control and command equipment for the burner, compliant with European standard EN298. • Intelligent connectors for burner/train (error proof). • 7 poles plug for the auxiliary feeding and for the thermostatic connection, 4 poles plug to control the second stage operation. • Prepared for microamperometer connection with ionisation cable. • Electrical protection rating IP40. To be ordered separately: • Gas train complete with safety valve and one stage operating valve electrically controlled, min pressure switch, pressure regulator and gas filter. Accessories available on request Descrizione Euro 97980054 Soundproof burner cover (see page 247) Gas burner accessories Boiler Equipped with air closure device. Valve tightness control not required by EN676. Gas train with Valve Tightness Control. Minimum gas train inlet pressure needed to obtain maximum burner power with a combustion chamber backpressure of zero. **) Maximum gas inlet pressure at pressure regulator in CE version, at gas train for EXP version. Net calorific value at reference conditions of 0°C, 1013mbar: Natural gas HI 35,8MJ/m3 = 8550 kcal/m3 LPG HI 92MJ/m3 = 22000 kcal/m3

Burner/gas train match CE gas train version complies with EN676, EXP gas train version is for extra-European markets Gas type Curve on Execution P.Max** graph mbar Burner model P.Min* mbar Regulator with incorporated filter Part no. Included Included Included Included Included Included Included Included Regulator with incorporated filter Part no. Included Included To choose the correct gas train please refer to the information on page 10. For information on the structure, composition, and size of the gas train please refer to the diagrams on page 234. Perdite di carico Pressure drop (combustion...