Data Sheet for Product

Technical Instructions SAX Electronic Valve Actuator
Document Number 155-507 Non-spring Return, 24 Vac 3-position (Floating) Control
June 15, 2016
Page 6 Siemens Industry, Inc.
Mounting and
Installation
Indoor Use
Outdoor Use
1
1) Only in connection with Weather Shield ASK39.1 for NEMA 3R protection.
Figure 2. Acceptable Mounting Positions.
The vertical position is the recommended position for mounting. Figure 2 shows the
acceptable mounting positions.
Allow 8 inches (200 mm) above and on the wiring side of the actuator, and four inches
(100 mm) on all other sides of the actuator. This service envelope is the minimum space
required to access and service the actuator. See Dimensions for actuator dimensions
and the recommended service envelope.
CAUTION:
Do not rotate the actuator on a Pressure Independent Control Valve (PICV)
once the actuator and valve stem are connected. Doing so will inadvertently
adjust the flow setting of the valve.
Start-Up
Check the wiring for proper connections.
NOTE: The valve body assembly determines the complete assembly action.
Normally Closed Valve
Y1 control signal extends the actuator (0 to 1): Valve opens.
Y2 control signal retracts the actuator (1 to 0): Valve closes.
Normally Open Valve
Y1 control signal extends the actuator (0 to 1): Valve closes.
Y2 control signal retracts the actuator (1 to 0): Valve opens.
Three-Way Valve
Y1 control signal extends the actuator (0 to 1): Valve opens between Ports A and AB
(through port).
Y2 control signal retracts the actuator (1 to 0): Valve opens between Ports B and AB
(bypass port)
Wiring
NOTE: All wiring must conform to national and local codes and regulations (NEC, CE,
and so on).
Do not use auto transformers. Use earth ground isolating step-down Class 2 power
supplies.
Determine supply transformer rating by summing total VA of all actuators used.
The maximum rating for Class 2 step-down transformer is 100 VA. It is recommended
that no more than 10 actuators are powered by one transformer.