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Powermite 599
MT Series SSC Electronic
Valve Actuator, 24 Vac
Floating Control
Description
Features
Application
Product Numbers
Ordering a Valve
Plus Actuator
Assembly
The Powermite 599 MT Series SSC81U and SSC81.5U electronic valve actuators
require a 24 Vac supply to provide a floating control signal. These actuators control
Powermite 599 MT Series valves with a 7/32-inch (5.5 mm) stroke and a threaded
valve bonnet that fits the actuators.
• UL listed for plenum installations
• Direct-coupled installation without special tools (hand-tightened)
• Manual override
• Visual position indication
The Powermite 599 MT Series SSC81 electronic actuators and MT Series valves are
used in heating and cooling applications. They are used in liquid and steam
applications. The SSC81 series accepts plenum cable or 3/8-inch flex conduit
connection.
Actuator
SSC81U
SSC81.5U
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)
Spring Return
(Fail-Safe)
EA 599-16
May 10, 2011
Actuator Prefix
Code
259
260
Siemens Industry, Inc.
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Summary of Contents for Siemens MT Series
- Page 1 The Powermite 599 MT Series SSC81U and SSC81.5U electronic valve actuators require a 24 Vac supply to provide a floating control signal. These actuators control Powermite 599 MT Series valves with a 7/32-inch (5.5 mm) stroke and a threaded valve bonnet that fits the actuators.
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Page 2: Specifications
Technical Instructions MT Series SSC Electronic Valve Actuator, 24 Vac Floating Control Document Number 155-314P25 May 10, 2011 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: Service Kits
MT Series SSC Electronic Valve Actuator, 24 Vac Floating Control Technical Instructions Document Number 155-314P25 May 10, 2011 Service Kits 411555648 For actuators with date codes of 031215F or later. Kit contains: - Terminal cover - Cover screws-2 (not shown) -
Page 4: Mounting And Installation
Technical Instructions MT Series SSC Electronic Valve Actuator, 24 Vac Floating Control Document Number 155-314P25 May 10, 2011 Operation, Continued CAUTION: A valve must be connected to the actuator before applying power. If applying power to the actuator when a valve is not connected, the actuator will respond to a control signal and the shaft will extend until it reaches its maximum end stop. -
Page 5: Wiring Diagrams
MT Series SSC Electronic Valve Actuator, 24 Vac Floating Control Technical Instructions Document Number 155-314P25 May 10, 2011 Use earth ground isolating, step-down Class 2 transformers. Do not use Wiring autotransformers. Determine supply transformer rating by summing total VA of all actuators used. The maximum rating for a Class 2 step-down transformer is 100 VA. -
Page 6: Manual Override
Technical Instructions MT Series SSC Electronic Valve Actuator, 24 Vac Floating Control Document Number 155-314P25 May 10, 2011 Manual Override For manual positioning, the override knob is COUNTER CLOCKWISE in the center of the position indicator. See RETRACTS Figure 8. - Page 7 MT Series SSC Electronic Valve Actuator, 24 Vac Floating Control Technical Instructions Document Number 155-314P25 May 10, 2011 Dimensions (115,1) (140) Figure 10. 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.