SIT Gas block Tandem 0836019

SIT Group 8 3 6 - 8 3 7 TA N D E M M U LT I F U N C T I O N A L G A S C O N T R O L MODULATOR FOR OUTLET GAS FLOW: STEPPED (836 TANDEM) - CONTINUOUS (837 TANDEM) SERVO-CONTROLLED PRESSURE REGULATOR ALL ADJUSTMENTS ACCESSIBLE FROM ABOVE PIN 63AP7060/4  ELECTRICALLY MODULATED AUTOMATIC MULTIFUNCTIONAL CONTROL Multifunctional control with two near-silent automatic on-off valves, fitted with electrically modulated stepped (836 TANDEM) or continuous (837 TANDEM) gas flow. Servo-controlled pressure regulator. 836-837 TANDEM is suitable for appliances for catering, water heating and convector heaters, fitted with automatic ignition and flame supervision systems, which require the regulation of the gas flow as a function of the temperature. MAIN FEATURES Electric modulator of the gas outlet pressure: stepped (836 TANDEM) or continuous (837 TANDEM). Two near-silent automatic shut-off valves in class B (class A on request). Servo-controlled pressure regulator. Pilot outlet (optional) with gas flow restrictor. Inlet and pilot filters. Inlet and outlet pressure test points. Threaded gas inlet and outlet with provision for flange connection. Connection for pressure regulator/combustion chamber compensation. Data refer to EN 126  DESCRIPTION 1 On-off solenoid valve EV1 6 On-off solenoid valve EV2 2 Gas outlet pressure modulator 7 Pilot outlet 3 Adjustment screw for gas flow to the 8 Main gas outlet pilot 9 Holes (M4) for fixing flanges 4 Inlet pressure test point 10 Connection for pressure regulator / 5 Outlet pressure test point combustion chamber compensation 2 4 3 5 7 8 10 1 6 9 TECHNICAL DATA • Gas connections: Rp 1/2 ISO 7 POWER SUPPLY • Installation position: any position • Gas families: I, II and III STEPPED MODULATOR (836) CONTINUOUS MODULATOR (837) • Maximum gas inlet pressure: 60 mbar Voltage Consumption Voltage Consumption • Working temperature range: 0 ... 60°C (-20 ... +60°c on request) • Pressure regulator: Class C (rectified AC) (mA) (DC) (mA) • Automatic solenoid valves Class B (Class A on request) 230 V 27 220 V max 25 max 24V 270 28 V max 165 max 16 V max 310 max • 836 TANDEM stepped modulator - outlet gas pressure setting range: SAFETY SOLENOID VALVES - max. pressure 7 - 50 mbar (230V version: 7 ... 37 mbar) EV1 + EV2 Class A Class B Low Power vers. - min. pressure 2 - 45 mbar (230V version: 2 ... 30 mbar) Voltage (AC) Consumption (mA) Consumption (mA) Consumption (mA) 230 V 50 Hz 80 80 - • 837 TANDEM 220 V 60 Hz - 90 - continuous modulator - outlet gas pressure setting range: 24 V 50 Hz 900 850 500 2 - 20 mbar (white screw) 24 V 60 Hz - 900 600 on request 3 - 37 mbar (red screw) on request 7 - 50 mbar (black screw) Electrical protection rating IP54 with 150 type connectors. Data refer to EN 126  DIMENSIONS SMD n6.5 108 104 122 45 17 12 12 22 Rp1/2 Rp1/2 22 12 12 n° 5 M4 12 12 n° 5 M4 27.5 140 12 12 28 32 35 105 17 18 96.5 27.5 11 32 28 60 EV1 EV2 PILOT I STEP 25 COM 33 17 53 5.5 17 EV1 EV2 21 24.5 26 9 FLOW RATE AS A FUNCTION OF PRESSURE DROP Q [m Q [m/h /h 3 3 d=0.6] d=0.6] 7 CLASS B+B 6 5 CLASS B+B 4 I Family (d = 0.45) Q = 4.8 m3/h ∆p = 5 mbar 3 II Family (d = 0.6) Q = 4.2 m3/h ∆p = 5 mbar 2 III Family (d = 1.7) Q = 2.8 kg/h ∆p = 5 mbar 1 0 1 2 3 4 5 6 7 8 9 10 11 ∆p ∆p [mbar] [mbar]  OPERATION Reading the inlet pressure The inlet pressure can be read at the pressure test point E with or without both on-off solenoid valves energized. Pilot burner ignition When the automatic shut-off valve EV1 is powered, it permits the gas to supply the pilot burner outlet (applications with intermittent pilot) after passing through the inlet filter, the pilot filter and the pilot flow rate restrictor (PILOT). Main burner ignition When both automatic valves, EV1 and EV2, are energized, gas passage to the main burner is opened. Outlet pressure The outlet pressure is read at the test point A. PILOT E A EV1 EV2 REGULATED FLOW RATE IN ACCORDANCE WITH EN 88 Q [m[m Qgas 3 /h3/h d=0.6] d=0.6] 8 CLASS B+B 7 6 2L Inlet pressure range (mbar) 5 Gas type 4 2H Nominal Max. Min. 3 2H 20 25 17 2 2L 25 30 20 1 0 Outlet pressure tolerance +10%...-15% 7 8 9 10 11 12 13 14 15 16 17…