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Powermite™ 599
MT Series SSC81U Electronic
Valve Actuator, 24 Vac
Floating Control, Fail-in-Place
Description
Features
Application
Product Numbers
Ordering a Valve
Plus Actuator
Assembly
The Powermite 599 MT Series SSC81U electronic valve actuator requires a 24 Vac
supply to provide a floating control signal. This actuator controls Powermite 599 MT
Series valves with a 7/32-inch (5.5 mm) stroke and a threaded valve bonnet that fits the
actuator.
• UL listed for plenum installations
• Direct-coupled installation without special tools (hand-tightened)
• Manual override
• Visual position indication
The Powermite 599 MT Series SSC81U electronic actuator and MT Series valves are
used in closed loop heating and cooling applications. They are used in liquid and steam
(<5 psi) applications. The SSC81U actuator accepts a plenum cable or 3/8-inch flex
conduit connection.
Actuator
SSC81U
To order a complete valve plus actuator assembly from the factory, combine the
actuator prefix code with the suffix of the valve product number. See Technical Bulletin
TB251, Powermite 599 Series MT Series Terminal Unit Valve and Actuator Assembly
Selection (155-306P25) for selection procedures.
To order an actuator only, use the product number.
Technical Instructions
Document No. 155-314P25
Table 1. Product Numbers.
Operating Mode
Non-Spring Return
(Fail-in-Place)
EA 599-16
June 1, 2023
Actuator Prefix
Code
259
Siemens Industry, Inc.
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Summary of Contents for Siemens MT Series
- Page 1 Floating Control, Fail-in-Place Description The Powermite 599 MT Series SSC81U electronic valve actuator requires a 24 Vac supply to provide a floating control signal. This actuator controls Powermite 599 MT Series valves with a 7/32-inch (5.5 mm) stroke and a threaded valve bonnet that fits the actuator.
-
Page 2: Specifications
Technical Instructions MT Series SSC81U Electronic Valve Actuator, 24 Vac Floating Control Document Number 155-314P25 June 1, 2023 Warning/Caution Notations WARNING: Personal injury or loss of life may occur if you do not perform a procedure as specified. CAUTION: Equipment damage may occur if you do not follow a procedure as specified. -
Page 3: Operation
MT Series SSC81U Electronic Valve Actuator, 24 Vac Floating Control Technical Instructions Document Number 155-314P25 June 1, 2023 Operation A 24 Vac control signal to terminal Y1 extends the actuator shaft proportionately to the length of time the signal is applied. -
Page 4: Wiring Diagrams
Technical Instructions MT Series SSC81U Electronic Valve Actuator, 24 Vac Floating Control Document Number 155-314P25 June 1, 2023 Wiring Diagrams Figure 2. SSC81U Neutral Switching Figure 3. SSC81U Hot Switching Non-Spring Return. Non-Spring Return. Retracts actuator shaft Extends actuator shaft... -
Page 5: Service Kits
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. Powermite is a trademark of Siemens Industry, Inc. Other product or company names mentioned herein may be the trademarks of their respective owners.