Siemens Flowrite 599 Series Owner's manual

599 Series

Zone Valve Actuator

Technical Instructions

Document No. 155-710

February 7, 2023

SSA81U 24 Vac Electronic Valve

Actuator: Floating Control

Fail-in-Place

Siemens Industry, Inc.

Description

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.

Features

•Direct-coupled installation without tools

•Manual override with hex wrench

•Visual position indication

Application

For use in heating and cooling HVAC applications with Siemens 599 Series Zone

Valves that need 24 lb (105N) nominal force.

Product Number

Part Number

Description

Prefix Code

SSA81U

24 Vac

Floating

Normally Closed

244

Ordering

Information

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 SSA81U Electronic Valve Actuator

Document Number 155-710 24 Vac Floating Control

February 7, 2023

Page 2 Siemens Industry, Inc.

Warning/Caution Notations

WARNING

Personal injury/loss of life may occur if you do not perform a

procedure as specified.

CAUTION

Equipment damage may occur if you do not perform a

procedure as specified.

Specifications

Power supply

Operating voltage 24 Vac 20%

Frequency 50/60 Hz

Power consumption 0.8 VA

Function

Running time 150 seconds

Nominal stroke 1/10-inch (2.5 mm)

Nominal force 24 lb (105N)

Ambient conditions

Ambient temperature

Operation 41°F to 122°F (5°C to 50°C)

Transport and storage -13°F to 158°F (-25°C to 70°C)

Agency certification

Conformance

EMC directive 89/336/EEC

Low Voltage direction 73/23/EEC

UL873, cUL Certified to Canadian

Standard C22.2 No. 24-93

Miscellaneous

Medium temperature 34°F to 230°F (1°C to 110°C)

Dimensions Inches (mm) 3.26 H×3.26 W×1.9 D (82×83×48)

Weight 9 oz (0.25 kg)

Accessory

Figure 1. Conduit Connector.

ASY97: Conduit connector, quantity one (1).

Service Kits

Figure 2. Terminal Plug and

Block Cover

ASY99: Terminal plug and terminal block

cover for SSA81U, quantity one

each.

SSA81U Electronic Valve Actuator Technical Instructions

24 Vac Floating Control Document Number 155-710

February 7, 2023

Siemens Industry, Inc. Page 3

Operation

The actuators can be driven manually to any position between 0 and 1 with a 3 mm hex

wrench. The control signal from the controller; however, will take priority over any

manual position.

Mounting and

Installation

Figure 3. Mounting Position.

Mount the actuator in one of the allowable positions shown in Figure 3.

NOTE: Vertical is the recommended position.

When mounting the actuator in a plenum, the proper cable must be attached to meet

local codes.

Allow 8-inches (200 mm) above the actuator and 8-inches (200 mm) behind the cable

for service.

Installation Instructions are included with the actuator.

Wiring

Figure 4. SSA81U Wiring Diagram.

•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.

Technical Instructions SSA81U Electronic Valve Actuator

Document Number 155-710 24 Vac Floating Control

February 7, 2023

Page 4 Siemens Industry, Inc.

Manual Override

The actuators can be driven manually to any position between 0and 1with a 3 mm hex key.

The actuator will maintain its position until power is provided or restored. A control signal

from the controller, however, will take priority over any manual position.

NOTES:

•Do not perform a manual override while the power supply is connected: The actuator

will not track properly when the control signal is applied. A short power-off/power-on

sequence is recommended to recalibrate the actuator.

•To hold the actuator in the manually set position, the connecting cable must be

unplugged.

Position Indicator at 0

Position Indicator at 1

Figure 5. Position Indicator.

NOTE:

The 0and 1position

markings are for

reference only and not

for stroke measurement.

SSA81U Electronic Valve Actuator Technical Instructions

24 Vac Floating Control Document Number 155-710

February 7, 2023

Siemens Industry, Inc. Page 5

Start-Up

Check the wiring and the position indication. See Figure 5 for referred positions 0and 1on

the position indicator disc.

SSA81U Normally Closed

•When the position indicator disc is at the 0position the output shaft is extended

(two-way valve closed).

•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.

Technical Instructions SSA81U Electronic Valve Actuator

Document Number 155-710 24 Vac Floating Control

February 7, 2023

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.

Siemens Building Technologies, Inc.

1000 Deerfield Parkway

Buffalo Grove, IL 60089-4513

U.S.A.

Your feedback is important to us. If you have

comments about this document, please send

them to .sbt_technical.editor@siemens.com

Document No. 155-710

Printed in the U.S.A.

Page 6

Troubleshooting

See Wiring for proper connections.

If the actuator does not provide full flow or full close off, check that the actuator is

properly attached to the valve. If not, turn power off, tighten the bonnet ring on to the

valve completely, and power up to recalibrate.

If the actuator becomes inoperative, replace it.

Disposal

The device is considered electrical and electronic equipment for

disposal in terms of the applicable European Directive and may not be

disposed of as domestic garbage.

•Dispose of the device through channels provided for this

purpose.

•Comply with all local and currently applicable laws and

regulations.

Dimensions

Inches (Millimeters)

Figure 7. Dimensions of the SSA81U Actuator in Inches (mm).

Service envelope

Minimum access space recommended:

8-inches (200 mm) above the actuator and beside the terminal plug.

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