Description
FOR LOW AIRFLOW VELOCITIES
Circular mechanical self-powered volume flow controllers for the control of supply air or extract air in constant air volume systems with low airflow velocities
- Suitable for airflow velocities from 160 Ft/Min
- Very simple commissioning
- Mechanical stops for setting the volume flow rates
- Simple retrofit of an actuator for variable volume flows
- Any installation orientation; maintenance-free
- Casing air leakage to EN 1751, class C
Optional equipment and accessories
- Circular silencer Type CA or CF for the reduction of air-regenerated noise
- Hot water heat exchanger Type WL and electric air heater Type EL for reheating the airflow
- Actuator for variable volume flows or for qvmin – qvmax switching
Application
- Circular CAV controllers of Type VFC for the precise supply air or extract air flow control in constant air volume systems
- Mechanical self-powered volume flow control without external power supply
- For low airflow velocities
- Simplified project handling with orders based on nominal size
Special features
- Volume flow rate can be set using an external scale; no tools required
- Simple retrofit of an actuator is possible
- Correct operation even under unfavorable upstream or downstream conditions (1.5 D straight section required upstream)
- Any installation orientation
- Aerodynamic function testing of each unit on a special test rig prior to shipping
Parts and characteristics
- Ready-to-commission controller
- Damper blade with low-friction bearings
- Bellows that acts as an oscillation damper
- Leaf spring
- Rotary knob with pointer for setting the volume flow rate
- Lip seal
Attachments
- Min/Max actuators: Actuators for switching between minimum and maximum volume flow rate setpoint values
- Modulating actuators: Actuators for the stepless adjustment of volume flow rates
Useful additions
- Secondary silencer Type CA or CF
- Heat exchanger Type WL
- Electric air heater Type EL
Construction features
- Circular casing
- Spigot with lip seal, for circular connecting ducts to EN 1506 or EN 13180
- Damper blade with low-friction bearings and special bellows
Materials and surfaces
- Casing made of galvanized sheet steel
- Damper blade and other parts made of high-quality plastic, to UL 94, V1; to DIN 4102, material classification B2
- Leaf spring made of stainless steel
- Polyurethane bellows
Standards and guidelines
- Hygiene conforms to VDI 6022
- Casing air leakage to EN 1751, class C
Maintenance
- Maintenance-free as construction and materials are not subject to wear
M01 Actuator CM24-F for min/max switching
- Min/Max switching between volume flow setpoint values of mechanical self-powered CAV controllers Type VFC
- Min/Max change of the damper blade positions of flow adjustment dampers Type VFR
Parts and characteristics
- Supply voltage 24 V AC/DC
- 1-wire control or 2-wire control (3-point)
- Mechanical stops for setting the volume flow rates
- Positive lock connection with damper blade shaft
- Gear release magnet
- Indicator light: Actuator has reached setpoint, actuator in motion, actuator blocked
Commissioning
- Set the mechanical stops according to the minimum and maximum volume flow rates or the damper blade position
