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Siemens 599 Series Technical Instructions
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Siemens 599 Series Technical Instructions

Zone valve actuator
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599 Series
Zone Valve Actuator
SSA81U 24 Vac Electronic Valve
Actuator: Floating Control
Fail-in-Place
Description
Features
Application
Product Number
Ordering
Information
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.
•
Direct-coupled installation without tools
•
Manual override with hex wrench
•
Visual position indication
For use in heating and cooling HVAC applications with Siemens 599 Series Zone
Valves that need 24 lb (105N) nominal force.
Part Number
SSA81U
24 Vac
To order a complete valve plus actuator assembly from the factory, combine the
actuator prefix code with the suffix of the valve product number.
To order a single actuator, use the product number (for example, SSA81U).
Technical Instructions
Document No. 155-710
Description
Floating
Normally Closed
February 7, 2023
Prefix Code
244
Siemens Industry, Inc.

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Summary of Contents for Siemens 599 Series

  • Page 1 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.

  • Page 2: Specifications

    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.

  • Page 3: Operation

    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...

  • Page 4: Manual Override

    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.
  • Page 5 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...

  • Page 6: Troubleshooting

    Information in this publication is based on current specifications. The company reserves the right to make changes in specifications and models as design improvements are introduced. Other product or company names mentioned herein may be the trademarks of their respective owners. © 2005 Siemens Building Technologies, Inc. Siemens Building Technologies, Inc.