SIEMENS LDU11.323A27 ORIGINAL

SIEMENS LDU11.323A27 ORIGINAL 230V 50-60HZ 3.5VA The LDU11… valve proving system is designed for use with shutoff valves in connection with gas burners and gas appliances. In the event of inadmissible leakage, the system prevents the burner from starting up. The LDU11… system conforms to the requirements of EN1643 covering automatic shutoff valves for use with gas burners and gas appliances to EN161. The LDU11… and this Data Sheet are intended for use by OEMs which integrate the valve proving system in their products. The LDU11… is designed for automatic gas valve proving (leakage test) based on the pressure proving principle. It is for use on gas-fired combustion plant with or without vent pipe to atmosphere. In the case of plants with no vent pipe where EN standards apply, the notes given in «Connection examples without vent pipe to atmosphere» must be observed. Used in connection with 1 or 2 commercially available pressure switches, valve proving is automatically initiated with every burner startup, either – prior to burner startup – during the prepurge time if it lasts a minimum of 60 seconds – immediately after a controlled shutdown, or – on completion of the burner control’s control sequence, e.g. at the end of the postpurge time The valve proving test is based on the 2-stage pressure proving principle : 1. The valve on the mains side is tested by evacuating the test space and by monitoring the atmospheric pressure in it. 2. The valve on the burner side is checked by pressurizing the test space and by monitoring the gas pressure.

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