GasMultiBloc Combined regulator and safety valve Infinitely variable air/ gas ratio control mode MBC-300-VEF MBC-700-VEF MBC-1200-VEF

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1 GasMultiBloc Combined regulator and safety valve Infinitely variable air/ gas ratio control mode MBC-00-VEF 7.03 Max. operating pressure 30 mbar Compact design High flow values Low weight Low power consumption Modulating mode Adjustable outlet pressure up to 300 mbar Other available servo pressure regulator models: - zero pressure - constant pressure Printed in Germany Edition Nr Mountable accessories - Pressure switch - VPS Ratio V = / p L = 0.: 3: Zero point correction possible Internal pulse line Technical Description The DUNGS multiple actuator MBC VEF offers filter, valves and servo pressure regulator in one compact unit: - Dirt trap: microfilter - solenoid valves up to 30 mbar as per DIN EN class A group - Servo pressure regulator as per DIN EN 88 class A group ; EN Fine setting of gas and air pressure ratio - Flange connections with pipe threads as per ISO 7/ or NPT - Easy to install - Low weight As this system has a modular design, we can offer individual solutions with valve inspection system, pressure switches mini/ maxi and pressure limiters. High flow values at low pressure difference. Application The servo pressure regulator permits optimum mixture formation in forced air burners and premix burners; this applies to modulating and multi-stage variable operating modes. Suitable for gases of gas families,, 3 and other neutral gaseous media. Approvals EU type test approval as per EU Gas Appliance Directive: MBC...VEF CE-0085 BM 035 EU type test approval as per EU Pressure Equipment Directive: MBC...VEF CE003 Approvals in other important gas-consuming countries. 8

2 Functional Description Gas flow. If the V and V valves are closed, chamber a is under inlet pressure.. The min. pressure switch (option) is connected to chamber a via a borehole. If the inlet pressure exceeds the reference value set in the pressure switch, the switch switches through to the automatic burner control. 3. The V and V valves open after they are enabled by the automatic burner control. Gas flow through the chambers a and b is enabled. Functional description of the valveregulator combination Valves V and V can be controlled electrically and independent of each other. Each valve pretensions its own pressure spring when the plunger opens. If both valves are open, a pressure pulse is sent under the working diaphragm M. The intensity of this pressure pulse changes depending on the adjustable restrictor point D. The comparison diaphragms S for burner pressure and S for blower pressure p L are connected with each other via a rod. The ratio V can be set by shifting the bearing point. Zero point correction N acts on this rod mechanism via the air diaphragm S. Ambient pressure p amb or firing chamber pressure p F must be applied to the area between the comparison diaphragms. The firing chamber pressure reduces the burner pressure at a ratio of V >. Changes in the equilibrium of forces result in a change in the flow crosssection. The pressure under the working diaphragm is re-adjusted. The regulator unit adapts the free valve cross-section depending on the new flow requirement. Closing function If the supply voltage of the solenoid coils of V and V valves is interrupted, the pressure springs close the valves in <s. Block diagram MBC...VEF M D S S R Working diaphragm Restrictor Servo diaphragm for burner pressure p BR Servo diaphragm for blower pressure p L Regulator disc 0 Pressure regulator unit Regulator spring 3 Connecting flange Coarse filter and microfilters 5 Valve V Closing spring V 7 Housing Pressure taps, gas train diagram MBC...VEF p a p R M V S V S b a, b Pressure chambers in flow direction p Inlet pressure Burner pressure, outlet pressure: P amb Ambient pressure Blower pressure p L V 8 Plunger V 9 Solenoid V 0 Printed circuit board Electrical connection Valve V 3 Closing spring V Plunger V N D internal standard p F p amb p L p F p L external option 5 Solenoid V Solenoid housing Setting: 7 Gas-air ratio 8 Zero point correction 3 5 7,, 3,, 5 Screw plug G /8, 7 Seal plug G /8 3 8

3 Technical Data Nominal widths Flanges with pipe threads according to ISO 7/ (DIN 999) Max. operating pressure Inlet pressure range Guiding range Burner pressure range Media Ambient temperature Dirt trap device Pressure switch Servo pressure regulator Ratio setting range V Zero point correction N Solenoid valve V, V Measuring gas connection Burner pressure monitor Pulse and connection lines Voltage/frequency Electrical connection Rating / power consumption Switch-on duration Switching cycles Degree of protection Radio interference suppression MBC-00-VEF Rp /, 3/,, / Rp, /, /, Rp, /, /, and their combinations and their combinations and their combinations 30 mbar p e : 5 mbar to 30 mbar p L : 0, mbar to 00 mbar : 0,5 mbar to 00 mbar Gases of gas families,, 3 and other neutral gaseous media. -5 C to +70 C (do not operate MBC VEF below 0 C in liquefied gas systems. Only suitable for gaseous LPG; liquid hydrocarbons destroy the seal materials) Micro-filter made of chopped-strand nonwoven fabric. Filter replaceable without removing fitting The system can be equipped with pressure switch types GW A5, NB A, ÜB A as per DIN EN 85. For further information, refer to data sheets Pressure switch for DUNGS multiple actuators 5.0 Servo pressure regulator with adjustable burner pressure, as per DIN EN 88 class A, group ; EN 07- Gas-air ratio control with adjustable ratio V as well as correction of zero point N and firing chamber pressure connection Ratio V = / p L = 0.: 3:, other ratios on request possible Valves as per DIN EN class A group ; fast closing, fast opening G /8 DIN ISO 8, at inlet and outlet flanges, on both sides downstream of filter, between V and V, downstream of V (fitting the pressure switch may partially exclude measuring gas connection) Downstream of valve V, pressure switch can be mounted on the side of the adapter G /8 connection as per DIN ISO 8 for burner pressure (pbr; GAS), blower pressure (pl; AIR), firing chamber pressure (pf; combustion, atmosphere) Pulse and connection lines must be made of steel and conform to PN, DN. Condensate of pulse and connection lines may not enter the fitting. Strictly follow the operating and mounting instructions. ~(AC) 50-0 Hz 30 V -5 % +0 %, other voltages on request. Other preferred voltages: ~(AC) 00 V - 0 V, =(DC) V - 8 V Plug-in connection as per DIN EN for valves at ~ (AC) 30 V; +0 C: see type overview 00 % duty 0 per hour (30 s on/off) IP 5 as per IEC 59 (EN 059) Interference level N Materials of gas-conveying parts Housing Diaphragms Solenoid drive die-cast aluminium NBR basis steel, aluminium Installation position Vertical with upright solenoid or horizontal with horizontal solenoid, as well as their spacers 3 8

4 Dimensions [mm] MBC-300/700...VEF MBC-00...VEF e = space required for replacing the solenoid Mounting the pulse lines MBC...VEF p e : gas inlet pressure 5-30 mbar : burner pressure, gas mbar optional: external pulse standard: internal pulse p F : firing chamber pressure -0 mbar +50 mbar or atmosphere 7 p L max. = p L - p F = 00 mbar max. = - p F = 00 mbar 7 p L : blower pressure, air mbar 8

5 Pulse lines Pulse lines,, 7 must be made of steel and correspond to DN (diameter mm), PN. Other pulse lines materials are permissible as per type test together with the burner. Route pulse lines in such a way that no condensate can flow into the MBC...VEF. Route pulse lines in such a way that they are protected against cracks and deformation. Keep pulse lines short. Type Version Order no. 30 VAC DN Rp Opening time a Dimensions [mm] b c d e f g Solenoid no. Switching ops/h Weight [kg] 030 / - / < s /P 0 3, < s /P 0,5 MBC-00-VEF < s /P 0,8 MBC-00-VEF P max. [VA] for t = 3 s P max. [VA] operation Flange for Rp/NPT Order no. Order no. Rp / Rp 3/ Rp Rp / Line socket 3 pole + PE 0 39 Rp Rp / Rp / Rp Adapter, pressure gauge flange set G/ Adapter GW A with G/ Adapter Adapter GW A on flange NPT / NPT 3/ NPT NPT / Flanges, plug-in connection and system accessories must be ordered separately. NPT NPT / NPT / NPT

6 MBC...VEF key data Application Application Gas Type of gas / specific density [kg/m 3 ] Volumetric flow V [m 3 /h] V min. V max. Inlet pressure p e [mbar] p e,min. p e,max. Burner pressure [mbar] at V min. at V max. Blower pressure p L [mbar] at V min. at V max. Firing chamber pressure p F [mbar] at V min. at V max. Control range, output range Time taken to re-adjust air volume restrictors from small load to large load [s] Starting load [m 3 /h] Company / address Name / contact person Telephone f = V used Gas = Air density Density of gas used V Air x f Gas type Natural gas City gas Liquefied gas Air Density [kg/m 3 ] 0,8 0,58,08, dv 0,5 0,7,7,00 f,, 0,77,00 8

7 Volume flow pressure difference characteristics in steady state with microfilter Recommended operating range MBC (Rp 3/) MBC (Rp /) MBC (Rp & /) Basis + 5 C, 03 mbar, trocken Based on + 5 C, 03 mbar, dry Base + 5 C, 03 mbar, sec Base + 5 C, 03 mbar, secco Vn [m 3/h] Luft / Air / Aria dv =, Vn [m 3/h] Erdgas/Natural gas/gaz Naturel/Gas metano dv = 0,5 Volume flow pressure difference characteristics in steady state with microfilter Recommended operating range MBC (Rp /) MBC (Rp ) MBC (Rp / & ) Basis + 5 C, 03 mbar, trocken Based on + 5 C, 03 mbar, dry Base + 5 C, 03 mbar, sec Base + 5 C, 03 mbar, secco Vn [m 3/h] Luft / Air / Aria dv =, Vn [m 3/h] Erdgas/Natural gas/gaz Naturel/Gas metano dv = 0,5 7 8

8 GasMultiBloc Combined regulator and safety valve Infinitely variable air/gas ratio control mode MBC-00-VEF Volume flow pressure difference characteristics in steady state with microfilter. MBC-00-VEF Recommended operating range Basis + 5 C, 03 mbar, trocken Based on + 5 C, 03 mbar, dry Base + 5 C, 03 mbar, sec Base + 5 C, 03 mbar, secco We reserve the right to make changes in the interest of technical progress. Head Offices & Factory Karl Dungs GmbH & Co. KG Siemensstraße -0 D-730 Urbach, Germany Telefon +9 (0) Telefax +9 (0) Postal address Karl Dungs GmbH & Co. KG Postfach 9 D-730 Schorndorf, Germany Internet 8 8

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