Siemens MT Series

Powermite 599
Technical Instructions
Document No. 155-314P25
EA 599-16
May 10, 2011
MT Series SSC Electronic
Valve Actuator, 24 Vac
Floating Control
EA1157R1
Siemens Industry, Inc.
Description
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.
Features
• UL listed for plenum installations
• Direct-coupled installation without special tools (hand-tightened)
• Manual override
• Visual position indication
Application
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.
Product Numbers
Table 1. Product Numbers.
Actuator Operating Mode
Actuator Prefix
Code
SSC81U
Non-Spring Return
(Fail-in-Place)
259
SSC81.5U
Spring Return
(Fail-Safe)
260
Ordering a Valve
Plus Actuator
Assembly
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.

Siemens MT Series Specifications

General

Brand	Siemens
Model	MT Series
Category	Controller
Language	English

Summary

Product Description and Features

Description

Details the Powermite 599 MT Series SSC81U and SSC81.5U electronic valve actuators and their function.

Features

Highlights key attributes like UL listing, direct coupling, manual override, and visual position indication.

Application

Explains the use of Powermite 599 MT Series actuators and valves in heating, cooling, and liquid/steam applications.

Product Numbers

Lists available actuator models (SSC81U, SSC81.5U) with their operating modes and prefix codes.

Ordering Assemblies

Provides guidance on how to order complete valve plus actuator assemblies or actuators only.

Safety and Specifications

Warning and Caution Notations

Provides critical warnings regarding personal injury and equipment damage if procedures are not followed.

Specifications

Details electrical, functional, agency certification, ambient, and physical characteristics of the actuators.

Operation and Installation

Service Kits

Lists service kits for actuators based on manufacturing date codes.

General Operation

Explains how 24 Vac signals extend/retract the shaft and describes power failure behavior for SSC81U and SSC81.5U.

Calibration Stroke

Describes how to clear the calibration stroke from memory for the SSC81.5U actuator.

Mounting and Installation

Details allowable mounting positions and service clearance requirements for plenum installations.

Wiring and Controls

Wiring Guidelines

Specifies transformer requirements, power limits, and wiring notes for actuators.

Wiring Diagrams

Illustrates wiring configurations for SSC81U and SSC81.5U actuators with neutral or hot switching.

Advanced Operation and Troubleshooting

Manual Override

Explains how to use the override knob for manual positioning of the actuator shaft.

Start-up and Position Check

Guides on checking wiring and verifying actuator shaft position during start-up.

Troubleshooting

Recommends checking wiring for proper connections if issues arise.

Service Kits (Replacement)

Instructs to replace the unit if the actuator is inoperative.

Dimensions and Service Envelope

Dimensions

Provides detailed dimensional drawings of the SSC Actuator in inches and millimeters.

Service Envelope

Specifies the recommended minimum access space required around the actuator for service.