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1 Double solenoid valve Regulator and safety combination Infinitely variable floating operation DM-EF Printed in Germany Rösler Druck Edition 0.0 Nr. 9 Flanges, pressure switches, line sockets, pulse lines and screw unions are not contained in the scope of supply Technical description The DUNGS double solenoid valve DM- EF... integrates dirt trap devices, gas/air ratio controls, valves and pressure switches in a compact fitting: - Dirt trap device DM-EF 07-: pre-filter (microfilter) DM-EF : strainer - Solenoid valves up to 00 mbar as per DIN EN Class A Group - Sensitive setting of ratio between gas and air pressure - Servo pressure regulator as per DIN EN Class A Group ; EN 7- - High flow values with low pressure losses - Ratio = p Br / p L 0.7 : to : - Zero point correction N possible - External pulse lines, pulse flange - Interference degree N possible - Flange connections with tube threads as per ISO 7/ - Setting time < s (as per EN 7-) The modular kit ensures individual solutions comprising valve proving system, min./max. pressure switches and pressure limiters. Application The gas/air ratio control ensures optimal mixture formation in forced air burners and pre-mix burners; this applies to floating and two-step floating operations. Suitable for gases of gas families,, and other neutral gaseous media. Approvals EC type test approval as per EC Gas Appliance Directive: DM-EF CE-00 AS 00 EC type test approval as per EC Pressure Equipment Directive: DM-EF CE00 Approvals in other important gas consuming countries.

2 0 0 Functional description Gas flow. If valves and are closed, chamber a is subjected to inlet pressure until double seat of valve is reached.. The minimum pressure switch is connected to chamber a through a hole in the filter housing of DM- EF. If the inlet pressure exceeds the reference value set on the pressure switch, the latter switches through to the automatic gas burner control.. After the automatic gas burner control has been released, valves and open. Gas flow through chambers a, b and c of DM-EF is released. Mode of operation of valve regulator control on valve An inlet pressure-balanced regulator is integrated in valve (pressure regulator). Plunger is not connected to the valve plate unit. If it opens, the plunger pretensions the pressure switch and releases the valve plate unit. If the valve closes, the plunger acts directly on the valve plate unit. In closed position, alve blocks the pressure chamber below working diaphragm M against inlet pressure pe in chamber a. The pressure below working diaphragm M is defined via a changeable flow cross-section D. Comparison diaphragms for burner pressure pbr and blower pressure pl are connected to each other using a bar. The ratio can be set by moving the bearing point. Zero point correction N acts on this bar. The opposite side of the comparison diaphragms must be applied with ambient pressure pamb or combustion chamber pressure pf. The combustion chamber pressure has a reducing effect on the burner pressure at a ratio of >. Changes resulting from the force balance will lead to a change in the flow cross-section D downstream of valve. The pressure below the working diaphragm resets and valve plate unit changes the free cross-section. Mode of operation of valve The plunger of valve is connected to the valve plate unit. When it is opened, the plunger pretensions the pressure spring. alve opens completely and without any delay. Block diagram of DM-EF Main valve a, b, c Pressure chambers in flow Main valve direction Control valve p Br Burner pressure Control valve p F Combustion chamber pressure p amb Ambient pressure M Working diaphragm p L Blower pressure D Restriction point,,,, Locking screw G/ Ratio setting 9 Test nipple N Zero point correction, 7, Pulse lines pl, pf, pbr Pressure taps, gas train schematic diagram DM-EF 07// DM-EF 9 7 alve is operated by valve. When valve is closed, it blocks the chamber below working diaphragm M against burner pressure. DM-EF 07// N 0 N N 0 N N 7 7 a b c M Gas/air ratio control D 7 7 pbr pf pamb pl Closing function If the supply voltage of the solenoid coils is interrupted, the main valves close within < s using the pressure spring. DM-EF 7

3 Specifications Nominal widths Flanges with tube thread as per ISO 7/ (DIN 999) Max. operating pressure Inlet pressure ranges Command range Burner pressure range Media Ambient temperature DM-EF 07, DM-EF, DM-EF DM-EF Rp /, /,, /, /, Rp and their combinations 00 mbar DM- EF S0 p e : mbar bis 00 mbar DM- EF S0 p e : 00 mbar bis 0 mbar p L : 0, to 00 mbar p Br : 0, to 00 mbar Gases of gas families,, and other neutral gaseous media - C to +70 C (in liquid gas systems, do not operate DM-EF below 0 C. Only suitable for gaseous liquid gas, liquid hydrocarbons destroy sealing materials) Dirt trap device Pressure switches Servo pressure regulator Ratio setting range Zero point correction N Solenoid valve Solenoid valve Test connection Burner pressure monitor pbr Pulse and connection lines A suitable gas filter must be installed upstream for protection. Pre-filter with microfilter, for DM-EF 07//. Use DM-EF gas filter, e.g. type GF /. See datasheet Pre-filter No. 9 Types GW A, GW A, NB A, ÜBA can be installed as per EN. For further information, refer to datasheet GW A No. 7 or datasheet GW A No. 7. Pressure regulator has a balanced supply, leakproof cover through valve on switchoff, as per DIN EN Class A and EN 7-. Gas/air ratio control with adjustable ratio as well as zero point correction N and combustion chamber connection Ratio = p Br / p L 0.7 : to :, other ratios on request possible alve as per DIN EN Class A Group, fast closing, fast opening alve as per DIN EN Class A Group, fast closing, fast opening G/ DIN ISO, at inlet and outlet flanges, on both sides downstream of dirt trap, on both sides between valves (pressure switch mounting can partly exclude test connection) Downstream of valve, pressure switch can be mounted on adapter at DM-EF 07// Connection G/ as per DIN ISO for burner pressure (pbr; GAS), blower pressure (pl; AIR), combustion chamber pressure (pf; combustion, atmosphere) Pulse and connection lines must be made of steel and > PN, DN. Condensate of pulse and connection lines may not enter fitting. It is compulsory to comply with the operating and mounting instructions. oltage/frequency Electrical connection Performance rating/current consumption Switch-on duration Degree of protection/radio interference suppression DM-EF 07-: ~ (AC) 0-0 Hz, 0, -% +0 % Preferred voltages: 0 AC, DC, DC Plug connection as per DIN EN See type overview 00 % ED IP as per IEC 9 (EN 09)/interference degree N Materials of parts in contact with gas Housing Diaphragms, seals Solenoid drive Aluminium diecasting NBR basis, siloprene (silicon caoutchouc) Steel, brass, aluminium Installation position ertical with vertical solenoid

4 Dimensions DM-EF 07// DM-EF 07 = DM-EF = DM-EF = DM-EF 79 DM-EF 07= 7 DM-EF =00 DM-EF =00 A 0 N DM-EF 07 = 0 DM-EF / = 0 DM-EF 07 = 7 DM-EF / = DM-EF 07 = DM-EF / = DM-EF 07 = DM-EF = DM-EF = 70 DM-EF 07= DM-EF =00 DM-EF =00 B DM-EF 07 = 0 DM-EF = DM-EF = B 00 0 N 00 A = Space required for cover of pressure switch B = Space required for changing the solenoid 7 9 Type Rp Opening time P max. [A] I max. [A] ~(AC) 0 Weight [kg] DM-EF 07 Rp / < s 0,, DM-EF Rp / < s 0,9,7 DM-EF Rp < s 0 0,7 7,9 DM-EF Rp < s 00 0,,

5 0 0 Installation of pulse lines p e : gas inlet pressure S0: - 00 mbar S0: 00-0 mbar p L : blower pressure, air 0, - 00 mbar p F : firing chamber pressure - mbar +0 mbar or atmosphere p L max. = p L - p F = 00 mbar p Br max. = p Br - p F = 00 mbar p Br : burner pressure, gas 0, - 00 mbar Pulse flange set Pulse line ➃ can be replaced by a pulse flange. The pulse flange ensures an internal pulse tap p Br in connection with the outlet flange. Pulse lines Pulse lines ➁, ➂, ➃ must be > DN (dia. mm), correspond to PN and made of steel. Other materials of pulse lines are only permitted as per type test approval together with the burner. Pulse lines must be routed in such a way that no condensate can flow into the DM-EF. Pulse lines must be routed safely against rip-off or deformation. Keep pulse lines short. Pulse flange set Order No. Ø [mm] Construction length [mm] DM-EF DM-EF / 7 7 DM-EF / 0 DM-EF 7

6 Flow diagram DM-EF 07 Rp / with microfilter DM-EF 07/ Recommended operating range p [mbar] 0 Flow diagram DM-EF Rp / with microfilter Basis + C, 0 mbar, trocken Based on + C, 0 mbar, dry Base + C, 0 mbar, sec Base + C, 0 mbar, secco n [m /h] Luft / Air / Aria dv =, n [m /h] Erdgas/Natural gas/gaz Naturel/Gas metano dv = 0, Recommended operating range p [mbar] 0 Basis + C, 0 mbar, trocken Based on + C, 0 mbar, dry Base + C, 0 mbar, sec Base + C, 0 mbar, secco n [m /h] Luft / Air / Aria dv =, n [m /h] Erdgas/Natural gas/gaz Naturel/Gas metano dv = 0,

7 Flow diagram DM-EF Rp with microfilter Recommended operating range p [mbar] n [m /h] Luft / Air / Aria dv =,00 Flow diagram DM-EF Rp with strainer p [mbar] Basis + C, 0 mbar, trocken Based on + C, 0 mbar, dry Base + C, 0 mbar, sec Base + C, 0 mbar, secco n [m /h] Erdgas/Natural gas/gaz Naturel/Gas metano dv = 0, Recommended operating range Basis + C, 0 mbar, trocken Based on + C, 0 mbar, dry Base + C, 0 mbar, sec Base + C, 0 mbar, secco n [m /h] Luft / Air / Aria dv =, n [m /h] Erdgas/Natural gas/gaz Naturel/Gas metano dv = 0, 7 f = gas used = Air tightness Tightness of gas used Air x f Gas type Natural gas Town gas Liquid gas Air Tightness [kg/m ] dv f

8 Double solenoid valve Regulator and safety combination Infinitely variable floating operation DM-EF 07 - Key design characteristics Key design characteristics DM-EF Application Application Gas Gas type (specific tightness (kg/m)) olume flow [m /h] min. max. Inlet pressure p e [mbar] p e,min. p e,max. Burner pressure p Br [mbar] at min. at max. Blower pressure p L [mbar] at min. at max. Combustion chamber pressure p F [mbar] at min. at max. Regulator range, performance range Actuating time of air flow rate restrictor from small load to big load [s] Start load [m /h] Company / address Name / person responsible Phone We reserve the right to make any changes in the interest of technical progress. Head Offices and Factory Karl Dungs GmbH & Co. KG Siemensstraße -0 D-70 Urbach, Germany Telephone +9 (0)7-0-0 Fax +9 (0)7-0- Postal address Karl Dungs GmbH & Co. KG Postfach 9 D-70 Schorndorf, Germany Internet

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