Installation Instructions

Document No. 129-335
Installation Instructions
April 1, 2021
Page 2 of 4 Siemens Industry, Inc.
Installation
CAUTION:
The black actuator attachment support ring
must be in place on top of the valve bonnet
before installing the actuator.
If the support ring is not in place, damage to
the actuator connection may result.
Mounting the SFP Actuator to a Valve
1. Place the actuator on the valve and firmly hand-tighten the
coupling piece.
2. Connect the wires. See Wiring.
Mounting the SFA Actuator on a Valve
1. Rotate the manual override lever and latch.
2. Place the actuator on the valve and firmly hand-tighten
the coupling piece.
CAUTION:
Failure to fully rotate the manual override
handle before hand tightening will hinder
proper valve close off.
3. Release manual override handle.
4. Connect the wires. See Wiring.
Figure 2. Mounting the Actuator on a Valve.
The installation is now complete.
Removing the Actuator from a Valve
1. Disconnect the wiring.
2. Unscrew actuator-coupling piece from the valve body
threads.
3. Remove the actuator from the valve.
Wiring
• All wiring must conform to NEC and local codes and
regulations.
• Use earth ground isolating step-down Class 2
transformers.
NOTE: Do not use autotransformers.
• Determine the supply transformer rating by summing
the total VA of all actuators used. The maximum
rating for a Class 2 step-down transformer is 100 VA.
NOTE: It is recommended that one transformer
power no more than 10 actuators.
• SFA71U/SFP71U 24 Vac actuators: Wiring
connection can be made inside the actuator housing
(remove the housing top for access).
• Line voltage actuators: Wiring connection requires
junction box and flex conduit no further than
15 inches (381 mm) from actuator.
CAUTION:
G0 and G must be properly wired for correct
function and full life of the actuator.
Figure 3. 24 Vac Actuator Wiring Diagram.
Figure 4. 120 Vac Actuator Wiring Diagram.
Figure 5. 208 Vac Actuator Wiring Diagram.