SIT Gas block Nova 0820010

SIT Group 8 2 0 N O VA M U LT I F U N C T I O N A L G A S C O N T R O L THERMOELECTRIC FLAME SUPERVISION DEVICE SERVO-CONTROLLED PRESSURE REGULATOR AUTOMATIC SHUT-OFF VALVE PIN 63AP7060/2  M U LT I F U N C T I O N A L GAS SINGLE-CONTROL Multifunctional control with thermoelectric flame supervision device, single-control knob (Off, Pilot, On), restart interlock, servo-controlled pressure regulator, on/off electric solenoid. A step opening ignition device can be fitted on request. The 820 NOVA is suitable for use with boilers, catering equipment, hot air generators, radiators and other heating appliances. MAIN FEATURES Control knob with Off, Pilot and On positions. Thermoelectric flame supervision device with re-start interlock. Near silent shut-off valve. Servo-controlled pressure regulator. Step opening ignition device (optional). Main gas flow control (optional). Pilot outlet with gas flow adjustment screw. Inlet and pilot filters. Inlet and outlet pressure test points. Threaded gas inlet and outlet with provision for flange connection. Connection for combustion chamber pressure regulator compensation.  DESCRIPTION 1 Control knob 9 Actuation valve 2 Pressure regulator cap screw 10 Pilot outlet 3 Pilot gas rate adjuster 11 Main gas outlet 4 Thermocouple connection 12 Holes (M5) for mounting flange 5 Alternative thermocouple connection 13 Supplementary fixing points for valve 6 Provision for accessories support 14 Connection point for combustion bracket chamber pressure regulator 7 Inlet pressure test point compensation 8 Outlet pressure test point 10 1 2 3 4 11 6 12 7 8 9 13 5 14 TECHNICAL DATA • Gas connections: Rp 1/2 ISO 7 ELECTRICAL DATA • Installation positions: any • Gas families: I, II and III Supply Voltage (AC) Consumption (mA) • Maximum gas inlet 240 V 50 Hz 25 pressure: 60 mbar 220 V 50 Hz 20 • Maximum outlet pressure 220 V 60 Hz 25 setting range: 3...30 mbar (optional 20...50) 24 V 50 Hz 210 • Working temperature 24 V 60 Hz 220 range: 0...70 °C (optional -20... +60°C) • Pressure regulator: Class B Electrical protection rating IP54 using 160-type connectors • Automatic shut-off valve: Class D (Class C on request) with screw and gasket - code 0.960.104 Data refer to EN 126  DIMENSIONS GAS FLOW AS A FUNCTION OF PRESSURE LOSS Q [m3/h d=0,6] CLASS D CLASSEDD 10 I Family (d = 0.45) Q = 7.5 m3/h ∆p = 5 mbar CLASSEC C CLASS II Family (d = 0.6) Q = 6.5 m3/h ∆p = 5 mbar 8 III Family (d = 1.7) Q = 8.1 kg/h ∆p = 5 mbar 6 CLASS C 4 I Family (d = 0.45) Q = 5.3 m3/h ∆p = 5 mbar 2 II Family (d = 0.6) Q = 4.6 m3/h ∆p = 5 mbar 0 III Family (d = 1.7) Q = 5.8 kg/h ∆p = 5 mbar 5 10 ∆p [mbar]  ACTUATION Pilot flame ignition Press the control knob and rotate to Pilot . Press the knob and ignite the pilot flame, keeping the knob fully fig. 1 depressed for a few seconds (fig. 1). Release the knob and check the pilot flame stays on, otherwise repeat the ignition procedure. Main burner ignition Slightly depress the control knob and rotate to On (fig. 2). When the automatic valve is powered, the gas flow to the main burner is fig. 2 opened. Valves with a step opening ignition device reach the maximum rate of flow after approx. 10 seconds. Pilot position To keep the main burner off and the pilot flame on, slightly depress the control knob and rotate to Pilot . fig. 3 Shut-down Slightly depress the control knob and rotate to Off (fig. 3). CAUTION: The re-start interlock device prevents the appliance from re-igniting until the flame supervision device has interrupted the gas flow. After this stage (i.e. when the magnet unit has closed) it is possible to re- ignite the appliance. GAS FLOW SET TO EN 88 Q = [m3/h d=0.6] 14 12 CLASS C 10 Inlet pressure range 8 Type of gas 2L 6 Nominal Max. Min. 4 2H 20 25 17 2H 2L 25 30 20 2 Outlet pressure tolerance +10%...-15% 0 6 8 10 12 14 16 18 Pu [mbar] Q = [m3/h d=0.6] 14 12 CLASS D 10 Inlet pressure range 8 2L Type of gas 6 Nominal Max. Min. 4 2H 20 25 17 2H 2 2L 25 30 20 0 Outlet pressure tolerance +10%...-15% 6 8 10 12 14 16 18 Pu [mbar]  INSTALLATION Main gas connection The connection must be made using gas pipes with Rp 1/2 ISO 7. Torque: 25 Nm. If optional flanges are used, first screw the pipes onto the flanges and then the flanges onto the valve. Recommended torque for flange fixing screws: 3 Nm. Connection to the pilot burner Ø 4 mm, Ø 6 mm or Ø 1/4 pipes can be used. Use appropriately sized nut and olive. Tighten to 7 Nm torque. Connection to the combustion chamber The “air” section of the pressure regulator may be connected to the combustion chamber if the latter is under pressure. Use the SIT fittings provided. Torque: 1 Nm Electrical connections The use of special connectors is recommended for the mains powered versions. In order to ensure that the valve is connected to the appliance’s earth circuit, always use the power connector with the earth terminal, fixing it with the appropriate screw. The 24 VAC versions must be powered by an isolating transformer (at a very low safety voltage as per EN 60742). Use AMP 6.3x0.8 mm DIN 46244 terminals for the connection. Make the connections according to the specific standards for the appliance. All relevant safety devices (e.g. the overheat thermostat) must cut off the power supply to the magnet unit. CAUTION: When all the connections have been completed, check the gas seals and wiring insulation. V~ 2 4 6 8 10 12 WIRING DIAGRAMS V~ Ambient thermostat  SETTINGS AND ADJUSTMENTS Checking the inlet and oulet pressure Loosen the test-point screws provided to check inlet and outlet pressure. Tighten the screws to the recommended torque of 2.5 Nm. Adjusting the outlet pressure Remove the plug (A), turn the screw (B) clockwise to increase outlet pressure and anticlockwise to reduce it. After setting, ensure plug (A) is properly secured. Overriding the pressure regulator For conversion to operation on third family gases replace the plug (A), the adjustment screw (B) and the spring (C) with the…