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The VPS 504 is the valve proving system for DUNGS multiple actuators
Dungs MVD 510/5 Solenoid Gas Safety Shut Off Valve 1" IP65 110v
Econex FE632 Gas Filter
please refer to the datasheet below
Siemens LME21.330C2 230v Burner Control Box Dungs The VPS 504 is theSiemens LME21. 330C2 Burner Control Box 230V Siemens Part Number: BPZ: LME21. 330C2 Overview LME21. 330C2 B27 burner controls are used for the startup and supervision of 1 or 2 stage gas or gas oil burners in intermittent operation (of small to medium capacity operation, with or without a fan in intermittent.) The flame is supervised by an ionisation probe or flame detector QRA with the ancillary unit, AGQ3A27 for gas oil forced draft burners or blue