Belimo Holding Ag

Paul Guyer

Silvio Grogg

Daniel Aeberli

Reto Anliker

A method for operating a control valve using an HVAC actuator is described, the method comprises a circuit of the HVAC actuator executing the steps of: monitoring (S) a rotation angle (ϕ) associated with a drive torque (M) applied by the HVAC actuator for moving the valve member; detecting (S) a blocking of the control valve, if the applied drive torque (M) effects a change of the rotation angle (Δϕ) which is smaller than a threshold angle (ϕ); upon detection of the blocking, controlling the HVAC actuator to repeatedly change the applied drive torque (M) between a first torque value (M) and a second torque value (M); and controlling the HVAC actuator to periodically modulate (S) the first torque value (M) between a third torque value and a fourth torque.

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Dürnten, Switzerland

Paul Guyer