Installation Instructions

Installation Instructions
Document No. 129-611
January 19, 2016
SAS81 Series Electronic Valve Actuators
Item Number 129-611, Rev. AA Siemens Industry, Inc.
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
WARNINGS:
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.
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
1. Remove actuator cover screws using either a
No. 2 Phillips or a No. 2 flat-blade screwdriver and
detach actuator cover.
2. Identify and disconnect wires.
3. Replace actuator cover. Use cover screws to secure
actuator cover in place.
4. Loosen coupling piece.
5. Remove actuator from valve.
Mounting an Actuator to a Valve
1. If you are attaching the actuator to a new valve, remove
the protective plastic cap from the valve stem.
2. On the SAS81.03U Actuator, turn the manual-positioning
knob counterclockwise to its end point.
3. Place the actuator on the valve.
4. Hand-tighten the coupling piece.
5. Use either a Phillips head screwdriver or a flat- blade
screwdriver to remove the actuator cover for access to the
terminal block.
6. Attach wires. See Wiring and Start-Up.
7. Place the cover on the actuator.
8. Fasten the cover with the screws