Volume flow controller VRE Active

Overview
The VRE Active volume flow controller (VRE Active) regulates a constant or variable volume flow in round air ducts of Comfort Air Technology systems independently of upstream pressure. Versions support full shut-off and are available for dynamic (VRactive) and static (VRactive-s) measurement. Actuation and control are electrical and require external power. The housing features push-in ends with lip seals compatible with ducts to DIN EN 1506 / DIN EN 13180.

Key benefits

• Highest control accuracy in the low air velocity range due to differential pressure amplification
• Energy-efficient operation with minimal pressure loss from a compact differential pressure element
• Very short installation length, insensitive to inflow for straightforward integration
• Optimized construction providing particularly high airtightness
• Available with static differential pressure measurement — suitable for laboratory and hospital applications

Application & design notes
Designed for installation in round ducts of HVAC and Comfort Air Technology systems that require precise volume flow control. Select dynamic measurement versions for clean air and static measurement versions for duct systems where contamination is present. Multiple housing and material options are offered to meet different installation and environmental requirements.

Design / Options

• Analog control
• Multiple housing versions
• MP (optional)
• Galvanized steel
• BACnet interface
• Silencer SDE (optional)
• Modbus interface
• Measurement principle options
• Coating (optional)
• Dynamic measurement (for non-polluted air)
• Static measurement (for polluted air) (optional)
• Stainless steel (optional)
• Hand adjustment device (optional)
• Insulating shell (optional)
• Analog and digital control (bus)

Product details
Highest control accuracy in the low air velocity range, low pressure loss and very short installation length make the VRE Active suitable for energy-efficient HVAC applications where precise volume flow control and airtight shut-off are required.

Technical specifications

• Volume flow range: 27 – approx. 4500 m³/h
• Control ratio: 10 : 1
• Differential pressure range: up to 1000 Pa
• Casing leakage to DIN EN 1751: Class A (optionally Class C)
• Airtight shut-off to DIN EN 1751 Class 4 (DN 100 & 125: Class 3)
• Control deviation: max. 5% from V
• Sizes [mm]: Ø 100 – 400
• Installation length [mm]: 135 – 420