Product Overview

Technical Instructions MT Series SSC Electronic Valve Actuator, 24 Vac Floating (3-Position) Control
Document Number 155-314P25
August 1, 2007
Page 6 Siemens Building Technologies, Inc.
Manual Override
For manual positioning, the override knob
is in the center of the position indicator.
See Figure 7.
CLOCKWISE
EXTENDS
SHAFT
COUNTER
CLOCKWISE
RETRACTS
SHAFT
EA1161R1
A
B
AB
Figure 7. Manual Override.
Start-up
Check the wiring and the position indicator
(Figure 8).
Position Indicator Output Shaft
0 Retracted
1 Extended
0
1
EA1158R1
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.