Pressure Independent
Control Series
Technical Instructions
Document No. 155-773
September 1, 2015
SSD Electronic Valve Actuators
Floating or 0 to 10 Vdc Control
Spring Return
Non-Spring Return
Siemens Industry, Inc.
Description
Pressure Independent Control Series SSD Electronic Valve Actuators require a 24 Vac
power supply and receive a floating control signal (SSD81…) or a proportional 0 to
10 Vdc signal (SSD61…) to control a valve. The 0 to 10V SSD61U actuator also
accepts a 24 Vdc power supply.
These actuators are designed to work with 1/2- to 1-1/4 inch Pressure Independent
Control Series Valves with a 1/10-inch (2.5 mm), 1/5-inch (5 mm), or 7/32-inch (5.5 mm)
stroke and a threaded valve bonnet that fits the actuator.
Features
•
Nominal force >56 lbs (250 N)
•
Automatic stroke calibration on the SSD61…
•
UL listed for plenum installation
•
Reduced power consumption in holding position
•
Direct coupled installation without tools (hand-tightened)
•
Manual override
•
Visual position indication
Application
For use in heating and cooling HVAC applications with Pressure Independent Control
valves. They can be used in chilled/hot water applications or in water-glycol solutions up
to 50% in closed loop systems. The Spring Return SSDx1.5U Series actuators accept
plenum cable or 3/8-inch flex conduit connections.
Product Numbers
Table 1.
Product Number
Description
Operating Mode
Actuator Prefix Code
SSD81U
Floating
Fail-in-place
230
SSD61U
0 to 10 Vdc
Fail-in-place
231
SSD81.5U
Floating
Fail-safe
232
SSD61.5U
0 to 10 Vdc
Fail-safe
233
