Siemens Powermite 599 Series Technical Instructions
Ssc electronic valve actuator, 24 vac 3-position (floating) control
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Powermite 599 Series
MT Series SSC Electronic
Valve Actuator, 24 Vac
3-Position (Floating) Control
Description
Features
Application
Product Numbers
Ordering a Valve
Plus Actuator
Assembly
The Powermite 599 Series MT Series SSC81U and SSC81.5U electronic valve
actuators require a 24 Vac supply to provide a 3-position (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
• 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 that delivers a minimum of 67 lbs (300 N) nominal
force. 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
Fail-in-Place
Fail-Safe
EA 599-16
May 24, 2005
Actuator Prefix
Code
259
260
Siemens Building Technologies, Inc.
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Summary of Contents for Siemens Powermite 599 Series
- Page 1 • Visual position indication 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 that delivers a minimum of 67 lbs (300 N) nominal force.
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Page 2: Specifications
0 to 90% rh (non-condensing) Medium temperature 41°F to 248°F (5°C to 120°C) 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 See Figure 8 Page 2 Siemens Building Technologies, Inc. -
Page 3: Service Kits
Figure 1. SSC81.5U Electronic Fail-Safe • If a subsequent power failure occurs Mechanism. (tn) of greater than 5 sec, the capacitor discharges (t d ) and the actuator returns to its normal fail-safe 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 5. SSC81.5U (Fail-Safe) Wiring. Manual Override For manual positioning, the manual COUNTER CLOCKWISE override knob in the center of the position RETRACTS indicator per Figure 6. SHAFT CLOCKWISE EXTENDS SHAFT Figure 6. Manual Override. Siemens Building Technologies, Inc. Page 5... -
Page 6: Troubleshooting
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. © 2005 Siemens Building Technologies, Inc. Siemens Building Technologies, Inc.