Volume flow controller VRF Active

Product overview
The VRF Active volume flow controllers regulate constant or variable air volume in rectangular air ducts of Comfort Air Technology systems up to full shut-off regardless of inlet pressure. Available with dynamic (VRFactive) or static (VRFactive-s) measuring principles. Activation and control require external electrical power. Casing cross-sections comply with recommended edge lengths according to DIN EN 1505 to allow maximum flow cross-section in confined installations. Flanged housing with slotted holes; insulated versions fitted with cage nuts.

Key features

• Highest control accuracy in the low air velocity range due to differential pressure amplification
• Energy-efficient design with minimal pressure loss from the small differential pressure element
• Very short installation length, insensitive to inlet flow for simple integration
• Optimized construction with high airtightness
• Also available with static differential pressure measurement – suitable for laboratories and hospitals

Powerful effect: LTG ActiveControl map measurement

• Highest measuring accuracy among comparable systems at low air velocities
• Combines extremely short installation lengths with maximum control accuracy in the low air velocity range
• Insensitive to incident flow thanks to optimized air routing to the measuring element
• Max. 5% deviation at nominal flow (Vnenn)

Technical data (summary)

• Volume flow range: 17 – approx. 300 m³/h
• Control ratio: 10:1
• Differential pressure range: up to 1000 Pa
• Casing leakage: DIN EN 1751 Class C
• Airtight shut-off: DIN EN 1751 Class 4 (200 x 100: Class 3)
• Control deviation: max. 5% from nominal flow (Vnenn)

Dimensions (L × W × H, mm)
200 × 100 – 1200 × 400
Installation length [mm]: 135 – 420

Design / Options

• Housing versions: galvanized steel, coated, stainless steel (optional)
• Analog control; BACnet (option); Modbus (option); analog/digital bus control
• Measuring principles: dynamic (for clean air), static (for polluted air, optional)
• Accessories: Silencer SDE (optional); MP (optional); hand adjustment device (optional); insulating shell (optional)

Technical specifications

• Product name / model: VRF Active
• Type: Variable volumetric flow controller (dynamic and static measuring principles available)
• Volume flow range: 17 – approx. 300 m³/h
• Control ratio: 10:1
• Differential pressure range: up to 1000 Pa
• Casing leakage: DIN EN 1751 Class C
• Airtight shut-off: DIN EN 1751 Class 4 (200 × 100: Class 3)
• Control deviation: max. 5% from nominal flow (Vnenn)
• Dimensions (L × W × H mm): 200 × 100 – 1200 × 400
• Installation length: 135 – 420 mm
• Materials / options: galvanized steel, coated, stainless steel (optional); insulating shell (optional)
• Control / interfaces: analog; BACnet (option); Modbus (option); analog/digital bus control
• Accessories / options: Silencer SDE (optional); MP (optional); hand adjustment device (optional)