DUNGS LGW...A2 - Pressure Switches for air, flue and exhaust gases

[{"filename":"lgw-a2_datasheet_en_214749.pdf","text":"Differential pressure\n switch for air, flue and\n exhaust gases\n\n LGW…A2, LGW…A2P\n LGW...A2-7\n 5.13\n\n\n\n\n LGW...A2, LGW...A2-7\n\n • RoHS II 2011/65/EU\n\n\n\n\n Technical description Approvals\n The differential pressure switches EC type testing certificate as per:\n LGW…A2… are adjustable differential • EC-Gas Appliances Regulation\n pressure switchesas per EN 1854 for • EC-Pressure Equipment Directive\n automatic burner controls.\n Suitable for switching a circuit on, off or Pressure switch class \"S\" as per EN 1854.\n over on changes in actual pressure value\n relative to the set reference value. Special designs for the North American\n The reference value (switching point) market with UL, FM and CSA registra-\n is adjusted on a setting wheel provided tions.\n\n\n\n\n Printed in Germany • Edition 07.21 • Nr. 214 749\n with a scale. On LGW…A2P: test button\n integrated in lower part as standard. Approvals in other important gas-\n consuming countries.\n Application\n Differential pressure monitoring in firing,\n ventilation and air-conditioning systems.\n Suitable for air, flue and exhaust gases\n and other non-aggressive gases as dif-\n ferential pressure switches; not suitable\n for industrial combustion gases.\n1…4\n\fFunctional description LGW…A2P test button\n Switching function\nDifferential pressure switch in pressure The LGW...A2P differential pressure\nand vacuum range. The differential switch is equipped with a test button.\n As pressure rises:\npressure acts via the diaphragm against The test button permits a service-\n 1 NC opens, 2 NO closes\nthe force of the setting spring on the friendly check of the safety function.\n As pressure falls:\nmicroswitch.The pressure switch oper- If the test key is pressed while the pres-\n 1 NC closes, 2 NO opens\nates without auxiliary power. sure exists, the connection to the pres-\n sure connection G 1/4 is interrupted\nDifferential pressure switch and the pressure under the diaphragm\nThe control unit responds to differential is released. The microswitch of the 2 NO\npressure. If the set reference value pressure switch changes the contact COM\n(mbar) is exceeded or undershot, the position from NO to NC. If the test but-\ncircuit is switched on, off or over. ton is released, the pressure below 3\n the diaphragms is built up again and 1 NC\n the microswitch changes to its original p\n position.\n\n\n Definition of switching difference ∆p 2 NO\n The switching difference ∆p is the Pressure COM\n at meter\n pressure difference between the up- Setting tolerance ± 15 %\n 3 1 NC\n per and lower switching pressures. Upper switching\n pressure\n\n\n\n\n Switching difference\n p N\n Falling\n\n\n Adjustment as\n 2 NO\n COM Lower\n Rising\n switching\n\n pressure falls\n ± 15 % pressure\n 3 1 NC\n\n Dimensions [mm] LGW…A2, LGW…A2-7 LGW…A2P p N\n A\n Ø 2,5 18,5 A\n Ø 2,5 18,5\n\n\n\n\n 18,5 ø 4,2\n 47,1 18,5\n…