The IFC is composed of linear flow control VFC and actuator IC 20 or IC 40. It is designed to adjust volumes of gas and cold air on various appliances. The IFC is designed for control ratios up to 25:1 and is suitable for regulating flow rates for modulating-controlled or stage-controlled combustion processes. Actuator IC 20 is controlled by a modulating signal or threepoint step signal. Actuator IC 40 offers additional functions. It can be adjusted using the BCSoft programming software via an optical interface. The control type (two-point signal, three-point step signal or continuous control), running times, angles of rotation and intermediate positions can thus be programmed.

Actuator IC 30 (24 V DC) can also be combined with a VFC. In pneumatic ratio control systems, the IFC with actuator IC 20..E determines the air volume for the required burner capacity.

The fine-adjusting valve VMV is used to adjust the high-fire rate.

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