TSA 14 FO | 79402

For continuous control of hot water valves in heating and cooling circuits for highly demanding control tasks in building control systems. The actuator converts the electrical signal (2-10V) received from a room thermostat or a building control system into a valve stroke. Depending on the version, the supply voltage is DC (direct voltage) or AC (alternating voltage). The actuator is factory-opened (First Open function) so that the vales at the heating circuit manifold remain open during initial commissioning. This facilitates mounting as well as filling and flushing of the system since, at this point in time, the control system is usually not yet operative. The First Open function (FO) is automatically disabled as soon as the actuator is electrically connected and fully closed. The FO function can also be manually deactivated by lifting the stroke indicator with a screwdriver. When the stroke indicator is lifted, the "clip Re-Open" is relieved and disables the FO function. For servicing, the factory setting "open" of the actuator can be restored manually via the clip without power having to be applied. To do so, lift the stroke indicator with a screwdriver until the clip can be pushed below the stroke indicator. The pre-load of the stroke indicator keeps the clip in position and the FO function is active again.