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Technical Instructions
Document Number 155-314P25
August 1, 2007
Specifications
Power requirements
Control characteristic
Functional operation
Agency certification
Ambient conditions
Physical characteristics
Page 2
MT Series SSC Electronic Valve Actuator, 24 Vac Floating (3-Position) Control
Operating voltage
Frequency
Power supply
SSC81U power consumption
SSC81.5U power consumption
Control Signal
Y2
Y1
G
G0 (SSC81.5U only)
Running time
SSC81U
SSC81.5U
Spring return, SSC81.5U only (Figure 1, )
Nominal stroke
Nominal force
Stroke/signal relationship
Capacitor charge time (Figure 1 )
Spring return (SSC81.5U only)
UL
cUL
Ambient temperature
Operation
Transport and storage
Ambient humidity
Media temperature
Wiring Connection
Weight
SSC81U
SSC81.5U
Dimensions
24 Vac ±20%
50/60 Hz ±2 Hz
Earth ground isolating, Class 2,
24 Vac transformer
NOTE:
Do not power more than
10 actuators with one
transformer.
0.8 VA
3 VA at ultra cap load,
2 VA at normal operation
Retracts actuator shaft
Extends actuator shaft
System potential
System neutral
150 s ±2% at 50 Hz
125 s ±2% at 60 Hz
125 s ±2% at 50/60 Hz
≈ 30 s
7/32-inch (5.5 mm)
67 lb (300N)
Linear
max. 180 sec
Non-mechanical, electronic returns
to stem up (0 position)
UL873 Listed
Certified to CSA
C22.2 No. 24-93
41°F to 122°F (5°C to 50°C) with
-13°F to 158°F (-25°C to +70°C)
0 to 90% rh (non-condensing)
41°F to 248°F (5°C to 120°C)
Plenum cable or 3/8-inch flex conduit
1.1 lb (0.5 kg)
1.3 lb (0.6 kg)
5.5-in × 4.35-in × 2.0-in
(140 mm × 110,6 mm × 48 mm)
Siemens Building Technologies, Inc.
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