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SQS Electronic Valve Actuator
24 Vac, Floating Control Spring Return
Powermite
MT Series Globe
Electronic Valve Actuator
Description
The Powermite SQS85.53U electronic valve actuator
requires a 24 Vac supply and receives a oating control signal to provide oating control. This actuator works with
Powermite MT Series terminal unit valves with a 7/32-inch (5.5 mm) stroke.
Features
• Maintenance-free with reversible motor
• UL listed for plenum installations
• Close off up to 160 psi
• Floating control signal input
• Mechanical spring returns the valve to its normal (spring return) position in power off condition.
• Suitable for liquid and low pressure (15 psi) steam applications
• Orderable as an actuator only or as a complete valve/actuator assembly
Applications
For use in small to medium HVAC installations with Powermite valves with a 7/32-inch (5.5 mm) stroke requiring a minimum of 90 pounds force (400 N). These valves can be used in liquid and low pressure steam service applications.
Recommendation:
Use only with the MT Series valve bodies. This actuator is not recommended for 2-position or pulse applications.
A-153
Valves
Siemens Product Guard PLUS 3 Warranty
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SQS85.53U Actuator Specifications
A-154
Operating Voltage
60 Hz .....................................................................24 Vac, + 20%, -15%
Frequency ....................................................................................... 60 Hz
Power Supply ......... Earth Ground Isolating, Class 2, 24 Vac Transformer
Power Consumption ......................................................................... 5 VA
Control Signal ...............................................................................Floating
Y1 ................................... 24 Vac, Power Extends Actuator Shaft (0 to 1)
Y2 ...................................24 Vac, Power Retracts Actuator Shaft (1 to 0)
Running Time at 60 Hz ..................................................................30 sec.
SQS85.53U Actuator Product Ordering
Description Part No.
Floating 3P Spring Return SQS85.53U 266
There are no repair parts for this product.
Replace the entire actuator if inoperative.
Actuator
Prex Code
Dimensions
Nominal Stroke .................................................................7/32" (5.5 mm)
Nominal Force ...................................................................90 lbf. (400 N)
Spring Return Time ....................................................................... 8 sec.
Agency Approvals ........................................................... UL/cUL, UL873
CSA C22.2 No. 2A-93
Ambient Temperature
Operation.......................................................... 23 to 122°F (-5 to 50°C)
Transport and Storage ..................................-13 to 149°F (-25 to 65°C)
Ambient Humidity .................................... 0 to 90% RH, Non-condensing
Wiring Connection .............Plenum Cable or Conduit via a 1/2" Knockout
Mounting Location .............................................. NEMA 1 (Interior Only)
Center Line to
Valves
Valve Size
in.
1/2" (15 mm) 6-1/16" (153 mm) 14" (355 mm) 5-1/16" (128 mm) 9" (225 mm)
3/4" (20 mm) 6-1/16" (153 mm) 14" (355 mm) 5-1/16" (128 mm) 9" (225 mm)
1" (25 mm) 6-5/16" (159 mm) 14-1/2" (370 mm) 5-1/16" (128 mm) 9" (225 mm)
Service height and width are the recommended dimensions to allow access to the product.
Top of Actuator
1
H
NO NC
NO NC
Service
Height
H W
Dimensions shown in inches (mm).
Actual Width
of Actuator
Service
Width
1
W
Accessories & Service Kits
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A-257
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