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Siemens Valve Proving System LDU11 Series

Siemens Valve Proving System LDU11 Series

Siemens
Siemens Valve Proving System LDU11 Series is an automatic gas valve leakage detection system designed for gas burners and gas-fired appliances. It uses a two-stage pressure proving principle to verify the tightness of automatic gas shutoff valves and prevents burner startup if unacceptable leakage is detected. Features safety lockout, fault indication, and local or remote reset functions. Available in AC 115V and 230V versions, with selected models conforming to EN 1643 requirements.

Product Description

Siemens Valve Proving System LDU11 Series

Siemens LDU11 Series is an automatic Valve Proving System designed to verify the tightness of gas shutoff valves used in gas burners and gas-fired appliances. It improves combustion system safety by detecting unacceptable valve leakage and preventing burner startup.

The LDU11 operates according to the pressure proving principle and can be used with one or two commercially available pressure switches, depending on the installation configuration. It is suitable for systems with or without a vent pipe to atmosphere, subject to the manufacturer's installation requirements.

Operating Principle

The Siemens LDU11 performs automatic valve proving using a two-stage pressure testing sequence.

  • Test 1: Checks the upstream gas valve by evacuating the test space and monitoring for an unacceptable pressure increase.
  • Test 2: Checks the downstream gas valve by pressurizing the test space and monitoring for an unacceptable pressure decrease.

If excessive leakage is detected during either test phase, the LDU11 initiates safety lockout and inhibits burner startup. A fault indicator and program indicator help identify the affected valve.

Key Features

  • Automatic gas shutoff valve leakage detection
  • Two-stage pressure proving operation
  • Compatible with one or two pressure switches
  • Prevents burner startup when leakage is detected
  • Safety lockout and fault indication
  • Local and electrical remote reset capability
  • Plug-in design for convenient unit replacement
  • Available in AC 115V and AC 230V versions
  • Selected models conform to DIN EN 1643

Applications

  • Industrial gas burner systems
  • Gas-fired boiler systems
  • Industrial furnaces
  • Gas heating systems
  • Gas valve safety monitoring systems

Installation Note: Model selection and installation must consider supply voltage, wiring configuration, pressure switches and compatibility with the burner control system. Installation and servicing must be performed by qualified personnel.

Specifications

Siemens LDU11 Series Technical Specifications

Brand Siemens
Series LDU11
Product Type Valve Proving System
Operating Principle Two-Stage Pressure Proving
Supply Voltage AC 115V / AC 230V (model dependent)
Voltage Tolerance -15% / +10%
Mains Frequency 50–60 Hz ±6%
Power Consumption During Test Approx. 3.5 VA
Power Consumption During Operation Approx. 2.5 VA
Built-in Fuse T6.3H250V
External Fuse Max. 10A (Slow)
Degree of Protection IP40 (subject to mounting, excluding terminal base)
Safety Class Class II
Operating Temperature -20°C to +60°C
Relative Humidity Less than 95% RH
Installation Altitude Max. 2,000 m above sea level
Weight Approx. 1,000 g
Mounting Position Optional
Designed Lifetime 250,000 burner startup cycles
Reference Standards DIN EN 1643, DIN EN 60730-2-5

Available Models

Model Supply Voltage t3 t4
LDU11.323A17 AC 115V 2.5 s 2.5 s
LDU11.323A27 AC 230V 2.5 s 2.5 s
LDU11.523A17* AC 115V 5 s 5 s
LDU11.523A27* AC 230V 5 s 5 s

t3 = Filling the test space
t4 = Evacuating the test space
*Valve opening times of LDU11.523A17 and LDU11.523A27 do not conform to EN 1643, as stated in the manufacturer's datasheet.

Reference: Siemens Datasheet CC1N7696en, dated 16 October 2018.