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The 599 Series SSA81U Electronic Valve Actuator requires a 24 Vac power supply and receives a floating control signal to control a valve. This actuator is designed to work with 599 Series Zone Valves with a 1/10-inch (2.5 mm) stroke and a threaded valve bonnet that fits the actuator.
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9 oz (0.25 kg) Accessory ASY97: Conduit connector, quantity one (1). Figure 1. Conduit Connector. Service Kits ASY99: Terminal plug and terminal block cover for SSA81U, quantity one each. Figure 2. Terminal Plug and Block Cover Page 2 Siemens Industry, Inc.
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Do not use autotransformers. • Use earth-ground isolating, step-down, Class 2, power supplies. • Determine supply transformer rating by summing total VA of all actuators used. • Use one transformer to power up to 10 actuators. Siemens Industry, Inc. Page 3...
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To hold the actuator in the manually set position, the connecting cable must be unplugged. NOTE: The 0 and 1 position markings are for reference only and not for stroke measurement. Position Indicator at 0 Position Indicator at 1 Figure 5. Position Indicator. Page 4 Siemens Industry, Inc.
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When the position indicator disc rotates to position 1, the output shaft is retracted (two-way valve open). Figure 6. SSA81U Normally Closed. (A) Turn the hex wrench counterclockwise and spindle retracts. (B) Turn hex wrench clockwise and spindle extends. Siemens Industry, Inc. Page 5...
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