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MT Series SSC Electronic Valve Actuator, 24 Vac Floating (3-Position) Control Technical 

Instructions 

 

Document Number 155-314P25 

 

August 1, 2007 

 

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. Flowrite is a trademark of Siemens Building Technologies, Inc. Product or company names mentioned herein 
may be the trademarks of their respective owners. © 2007 Siemens Building Technologies, Inc. 

 

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 

[email protected]

 

Document No. 155-31425 

Country of Origin: US 

Page 7 

 

 

Dimensions 

 

 

 

 

2

(48)

4.4

(110,8)

3.5

(89)

.85

(21,6)

4.5

(115,1)

5.5

(140)

EA1159R1

0

1

Figure 9.  SSC Actuator Dimensions in Inches (Millimeters).  

Service envelope 

Minimum access space recommended: 

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

 

Summary of Contents for Powermite 599 MT Series

Page 1: ...ation Application The Powermite 599 Series MT Series SSC81 electronic actuators and MT Series valves are used in heating and cooling applications They are used in liquid and steam applications that require an actuator The SSC81 series accepts plenum cable or 3 8 inch flex conduit connection Product Numbers Table 1 Product Numbers Actuator Operating Mode Actuator Prefix Code SSC81U Non Spring Retur...

Page 2: ... Functional operation Running time SSC81U 150 s 2 at 50 Hz 125 s 2 at 60 Hz SSC81 5U 125 s 2 at 50 60 Hz Spring return SSC81 5U only Figure 1 30 s Nominal stroke 7 32 inch 5 5 mm Nominal force 67 lb 300N Stroke signal relationship Linear Capacitor charge time Figure 1 max 180 sec Spring return SSC81 5U only Non mechanical electronic returns to stem up 0 position Agency certification UL UL873 Liste...

Page 3: ...tionately to the length of time the signal is applied In the event of a power failure with no control voltage the non spring return SSC81U will hold its last position In the event of a power failure the SSC81 5U spring returns to the stem up 0 position The SSC81 5U includes an electronic return mechanism that functions as follows See Figure 1 At power up t0 a capacitor must charge to its maximum c...

Page 4: ...onvolatile memory on the first startup of the actuator Successive startups bypass the calibration stroke unless the memory is manually cleared If installing the actuator on a different valve such as on a replacement valve manually clear the calibration stroke from memory as follows 1 Remove the terminal cover using a Phillips head screwdriver 2 Locate hole on the circuit board shorting bars 3 Inse...

Page 5: ...ull life of the actuator Wiring Diagrams NEUT CONTROLLER ACTUATOR EARTH GROUND ISOLATING CLASS 2 TRANSFORMER FOR 24 Vac POWER 120 Vac 1 0 Y2 Y1 G 24 Vac EA0795R1 Y2 Retracts actuator shaft Y1 Extends actuator shaft G System potential Figure 4 SSC81U Non Spring Return EA1234R1 NEUT CONTROLLER EARTH GROUND ISOLATING CLASS 2 24 Vac TRANSFORMER 120 Vac 24 Vac ACTUATOR G Y2 Y1 G0 1 0 0 Y2 Retracts actu...

Page 6: ... the center of the position indicator See Figure 7 CLOCKWISE EXTENDS SHAFT COUNTER CLOCKWISE RETRACTS SHAFT EA1161R1 A B A B Figure 7 Manual Override Start up Check the wiring and the position indicator Figure 8 Position Indicator Output Shaft 0 Retracted 1 Extended 0 1 EA1158R1 Figure 8 Position Indicator Shown in 0 Position Troubleshooting Check the wiring for proper connections Service Kits If ...

Page 7: ...n may be the trademarks of their respective owners 2007 Siemens Building Technologies Inc 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 us sbt siemens com Document No 155 31425 Country of Origin US Page 7 Dimensions 2 48 4 4 110 8 3 5 89 85...

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