Product Description
The SAS81 Series Actuators require a 24Vac or 24 Vdc supply and provide floating (three-position) control for Powermite 599 MT Series terminal unit valves with 7/32-inch (5.5 mm) stroke. In the SAS81.33U, a mechanical spring returns the valve to its normal position when there is no power supply.
Product Numbers
- SAS81.03U - Non-spring Return (Fail-in-place) actuator
- SAS81.33U – Spring Return (Fail-safe) actuator
Estimated Installation Time
- 12 minutes for wiring a factory installed actuator
- 30 minutes for field replacement of actuator
Required Tools
- No. 2 Phillips or flat-blade screwdriver
- Flat-blade calibration screwdriver (3 mm) for wiring connections
- Wire cutter/stripper
Warning/Caution Notations
⚠️Warning: Personal injury or loss of life may occur if you do not follow a procedure as specified.
⚠️Caution: Equipment damage may occur if you do not follow procedures as specified.
Prerequisites
ℹ️WARNINGS: If mounting the actuator to a valve already in line, either close the shut-off valves in the piping (upstream first, then downstream) or switch off the pump to allow the differential pressure in the valve to drop.
Disconnect the controller power before replacing an actuator.
Mounting
Figure 1 shows acceptable actuator mounting positions for water applications. The recommended mounting position of the actuator for low pressure steam applications is between 45° and horizontal.
Figure 1. Acceptable Mounting Positions. (Diagram shows various angles, including horizontal and 45 degrees, with an 'X' indicating unacceptable positions for steam applications.)
Installation
If you are mounting an actuator on a new valve, begin with the instructions, Mounting an Actuator to a Valve.
Remove Actuator from Valve
- Remove actuator cover screws using either a No. 2 Phillips or a No. 2 flat-blade screwdriver and detach actuator cover.
- Identify and disconnect wires.
- Replace actuator cover. Use cover screws to secure actuator cover in place.
- Loosen coupling piece.
- Remove actuator from valve.
Mounting an Actuator to a Valve
- If you are attaching the actuator to a new valve, remove the protective plastic cap from the valve stem.
- On the SAS81.03U Actuator, turn the manual-positioning knob counterclockwise to its end point.
- Place the actuator on the valve.
- Hand-tighten the coupling piece.
- Use either a Phillips head screwdriver or a flat-blade screwdriver to remove the actuator cover for access to the terminal block.
- Attach wires. See Wiring and Start-Up.
- Place the cover on the actuator.
- Fasten the cover with the screws.
Wiring
All wiring must conform to NEC and local codes and regulations.
Use earth ground isolating, step-down Class 2 transformers. Do not use auto transformers.
Determine supply transformer rating by adding up the total VA of all actuators used.
The maximum rating for Class 2 step-down transformers is 100 VA.
Do not power more than 10 actuators with one transformer. (Use 0.5 amp fuse on secondary actuator.)
- Remove actuator cover screws using either a No. 2 Phillips or a No. 2 flat-blade screwdriver and detach actuator cover.
- Access terminal block and attach wires per Figure 2 through Figure 5.
- Replace actuator cover. Use cover screws to secure actuator cover in place.
⚠️CAUTIONS: Terminals G and G0 must be properly wired for correct function and full life of the actuator. If the actuator makes a buzzing noise upon reaching setpoint, G and G0 are improperly wired and should be reversed.
Wiring Configurations
Figure 2. SAS81.03U 24 Vac NSR Floating Control - Neutral Switch
| Terminal | Connection | Function |
|---|---|---|
| G | Hot (+) | |
| Y1 | Connected to Neutral (-) | Extends actuator stem |
| Y2 | Connected to Neutral (-) | Retracts actuator stem |
Figure 3. SAS81.03U 24 Vac or 24 Vdc NSR Floating Control - Hot Switch
| Terminal | Connection | Function |
|---|---|---|
| G | Neutral (-) | |
| Y1 | Connected to Hot (+) | Extends actuator stem |
| Y2 | Connected to Hot (+) | Retracts actuator stem |
Figure 4. SAS81.33U 24 Vac SR Floating Control - Neutral Switch
| Terminal | Connection | Function |
|---|---|---|
| G | Hot (+) | |
| G0 | Neutral (-) | |
| Y1 | Connected to Neutral (-) | Extends actuator stem |
| Y2 | Connected to Neutral (-) | Retracts actuator stem |
Figure 5. SAS81.33U 24 Vac or 24 Vdc SR Floating Control - Hot Switch
| Terminal | Connection | Function |
|---|---|---|
| G | Hot (+) | |
| G0 | Neutral (-) | |
| Y1 | Connected to Hot (+) | Extends actuator stem |
| Y2 | Connected to Hot (+) | Retracts actuator stem |
Start-Up
The valve body (normally open or normally closed) determines action of the complete valve/actuator assembly.
Troubleshooting
- Check wiring for proper connections and secure attachments.
- Check for adequate power supply.
References
Powermite 599 MT Series SAS Electronic Valve Actuator, 24 Vac or 24 Vdc, Floating Control (3-Position) Technical Instructions (155-681).
Dimensions
Figure 6. SAS81.03U Actuator Dimensions
| A | B | C1 | C2 | D | E | |
|---|---|---|---|---|---|---|
| Inches | 5.9 | 3.1 | 0.9 | 2.8 | 1.2 | 0.9 |
| mm | 151 | 80 | 21.9 | 71.1 | 29.9 | 21.8 |
Figure 7. SAS81.33U Actuator Dimensions
| A | B | C1 | C2 | D | E | |
|---|---|---|---|---|---|---|
| Inches | 5.9 | 3.1 | 0.9 | 3.3 | 1.2 | 0.9 |
| mm | 151 | 80 | 21.9 | 84.6 | 29.9 | 21.8 |
Company Information
Siemens Industry, Inc.
Building Technologies Division
1000 Deerfield Parkway
Buffalo Grove, IL 60089-4513
USA
Tel. +1 847-215-1000
For feedback on this document, please send comments to: sbt_technical.editor.us.sbt@siemens.com
Document No. 129-611
Printed in the USA
Account Suspended
mailto:sbt_technical.editor.us.sbt@.siemens.com
