HERZ Differential Pressure Controller – DZR Brass Body (4002 / 4202 Series)

The HERZ 4002/4202 Differential Pressure Controller ensures stable pressure differentials in heating and cooling systems without external energy sources. Its DZR brass construction and EPDM diaphragm deliver corrosion resistance and long-term performance.

The unit allows adjustable setpoints between 5–30 kPa or 25–60 kPa, ensuring precise control of flow and system balance under varying load conditions.

  • 🔹 Body Material: DZR Brass.
  • 🔹 Pressure Range: 5–30 kPa or 25–60 kPa.
  • 🔹 Connection Type: Threaded (Male/Female options).
  • 🔹 Max Operating Pressure:
    • • 16 bar (4002 Series).
    • • 25 bar (4202 Series).
  • 🔹 Max Differential Pressure: 4 bar.
  • 🔹 Temperature Range:
    • • up to 130°C (DN ≤ 32).
    • • up to 110°C (DN 40–50).
  • 🔹 Min Operating Temperature: 2°C (with frost protection to -20°C).
  • 🔹 Membrane & O-Rings: EPDM.
  • 🔹 kVS Values: 2.66–14.95 depending on DN.
  • 🔹 Water Quality: ÖNORM H 5195 / VDI 2035 compliant.
  • 🔹 Capillary Tube: 1000 mm included.
  • 🔹 Guarantees consistent differential pressure across risers or branches.
  • 🔹 Enhances efficiency and comfort in variable-flow systems.
  • 🔹 Easy, precise setpoint adjustment with visual scale.
  • 🔹 Maintenance-free operation with corrosion-resistant materials.
  • 🔹 Compact design suitable for space-limited installations.
  • 🔹 Heating and cooling circuits in residential and commercial buildings.
  • 🔹 Fan coil and zone control systems.
  • 🔹 Radiator and underfloor heating loops.
  • 🔹 Pressure balancing in multi-branch hydronic networks.
  • 🔹 Energy-efficient HVAC distribution systems.
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