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Powermite 599
MT Series SSC Electronic
Valve Actuator, 24 Vac
Floating Control (3-Position)
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 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.
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
August 1, 2007
Actuator Prefix
Code
259
260
Siemens Building Technologies, Inc.
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Summary of Contents for Siemens Powermite 599 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.
-
Page 2: Specifications
Wiring Connection Plenum cable or 3/8-inch flex conduit Physical characteristics Weight SSC81U 1.1 lb (0.5 kg) SSC81.5U 1.3 lb (0.6 kg) Dimensions 5.5-in × 4.35-in × 2.0-in (140 mm × 110,6 mm × 48 mm) Page 2 Siemens Building Technologies, Inc. -
Page 3: Service Kits
Figure 1. SSC81.5U Electronic Spring • If a subsequent power failure occurs Return Mechanism. (tn) of greater than 5 seconds, the capacitor discharges (t d ) and the actuator spring returns to stem up 0 position. Siemens Building Technologies, Inc. Page 3... -
Page 4: Mounting And Installation
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. Page 4 Siemens Building Technologies, Inc. -
Page 5: Wiring Diagrams
Figure 6. SSC81.5U SR Hot Switch CONTROLLER ACTUATOR 24 Vac NEUT EARTH GROUND ISOLATING CLASS 2 24 Vac TRANSFORMER 120 Vac Y2…Retracts actuator shaft Y1…Extends actuator shaft G… System potential G0…System neutral Figure 5. SSC81.5U SR Neutral. Siemens Building Technologies, Inc. Page 5... -
Page 6: Manual Override
Check the wiring and the position indicator (Figure 8). Position Indicator Output Shaft Retracted Extended Figure 8. Position Indicator (Shown in 0 Position). Troubleshooting Check the wiring for proper connections. Service Kits If the actuator is inoperative, replace the unit. Page 6 Siemens Building Technologies, Inc. - Page 7 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.