Dungs Gas Multibloc MB-ZRDLE 412 B01 S50 (RP 1/2 - RP 2 Connection, 360 MBAR Inlet Pressure)

Product Details

The DUNGS MB-ZRDLE 412 B01 is a multifunctional GasMultiBloc designed for two-stage burner operation. It integrates a filter, a pressure regulator, and two safety shut-off valves into a single compact unit. The "ZR" designation is the key differentiator: it allows the burner to operate at a Partial Volume (Stage 1/Low Fire) and a Main Volume (Stage 2/High Fire). 1. Model Nomenclature & Suffixes MB: MultiBloc (Product family). ZR: Two-stage operation (Dual-load). D: Includes a Main Volume Restrictor (to limit max flow). LE: Slow opening behavior (Hydraulic brake for soft starts). 412: Nominal size (Typically uses Rp 1" or Rp 1 1/4" flanges). S20 / S50: Indicates the outlet pressure range (S20 = 4–20 mbar; S50 = 20–50 mbar). 2. Technical Specifications Feature Specification Max Operating Pressure 360 mbar (5.2 PSI) Output Pressure Range 4 – 20 mbar (Standard S20) Valve 1 (V1) Fast opening, fast closing Valve 2 (V2) Slow opening (< 20s), fast closing Filter Type Integrated fine-mesh sieve (0.8 mm) Voltage 230V AC (Standard), 110V AC, or 24V DC Enclosure Rating IP54 Ambient Temperature -15 °C to +70 °C 3. Two-Stage Operational Logic The MB-ZRDLE 412 allows for three distinct gas flow phases: Ignition/Fast Stroke: A quick "jump" to a preset initial volume for reliable spark ignition. Stage 1 (Partial Load): V2 opens partially to a set limit. This is often used for the "Low Fire" setting or warm-up phase. Stage 2 (Full Load): When the second stage is energized, V2 opens completely to the main volume limit for "High Fire" operation. 4. Key Adjustments Setting up a 412 requires adjusting four different parameters: Pressure Regulator: Set via the screw on the regulator section to establish the base gas pressure. Stage 1 (Partial Flow): Adjusted via the setting on the hydraulic brake of Valve 2. This limits how far the valve opens during the first stage. Stage 2 (Main Flow): Adjusted via the main volume restrictor (the large knob/screw on top) to set the maximum burner output. Fast Stroke: Adjusted by turning the internal screw under the small cap on the hydraulic brake to set the initial "jump." 5. Maintenance & Spare Parts Filter Element: The filter is located behind the side cover. It should be inspected annually. A clogged filter will result in a drop in outlet pressure. Replacement Coils: The solenoids can be replaced individually. For the 412, the 230V replacement coil for V2 is typically Type 100 or 110. Flange Kits: This unit requires Rp 1" (Part # 221061) or Rp 1 1/4" (Part # 221062) flanges for installation.