Compact, static

Functional description

VAV terminal units control the volume flow in a closed loop, i.e. measurement – comparison – control.

The volume flow rate is determined by measuring the differential pressure (effective pressure). For this purpose the VAV terminal unit is fitted with a differential pressure sensor.

The integral differential pressure transducer transforms the effective pressure into a voltage signal, which is then analysed by the microprocessor of the controller. The volume flow rate actual value is available as a data point or voltage signal. The factory setting is such that a 10 V DC voltage signal always corresponds to the nominal volume flow rate (V_nom).

The volume flow rate setpoint value comes from a higher-level controller (e.g. room temperature controller, air quality controller, central BMS), either as a voltage signal or as a data point, or from local switch contacts. Variable volume flow control results in a value between V_min and V_max. It is possible to override the room temperature control, e.g. by a complete shut-off of the duct.

The controller compares the volume flow rate setpoint value to the actual value and controls the integral actuator accordingly.

Volume flow rate parameters and voltage ranges are factory stored in the controller. Changes on the customer's site can easily be carried out using an adjustment device, a notebook with service tool, or a bus interface.

Volume flow control

• The volume flow controller works independent of the duct pressure
• Differential pressure fluctuations do not result in permanent volume flow rate changes
• To prevent the control from becoming unstable, a dead band is allowed within which the damper blade does not move.

Application

• Electronic volume flow controllers ASV115CF132E and ASV115CF152E as Compact controllers
• Variable air or constant air volume flow control
• Second, integral controller for room temperature control or differential pressure control
• The flow rate is measured according to the static measurement principle
• Voltage range for the actual and setpoint value signals 0 – 10 V DC or 2 – 10 V
• Separate inputs for override control V_min and V_max
• RS-485 communication interface (Sauter local communication)
• Setpoint value defaults and overrides by means of data exchange with a higher-level system
• Status values such as volume flow rate actual value and damper blade position are sent to the interface

• Functionality and I/O assignment to be parameterized by the customer

Construction

For TVR, TVJ, TVT, TZ-Silenzio, TA-Silenzio, TVZ, TVA, TVRK

• SA0: ASV115CF132E with integral actuator
• SC0: ASV115CF152E with integral fast-running actuator

Communication interface

• RS-485 (SLC, Sauter local communication)
• Up to 31 devices per segment

Operating modes

• Variable volume flow control: V_min – V_max
• V_min: Minimum volume flow rate
• V_max: minimum volume flow rate

Commissioning

• Complete project-specific parameterization and commissioning with manufacturer software and interface adapter required

• For C-values, see installation instructions for VAV controllers

Compact controller ASV115CF132E

Compact controller ASV115CF152E