Data Sheet for Product

Technical Instructions 599 Series Zone Valve 2-way, 3-way Thermic Actuators
Document Number 155-780
May 19, 2017
Page 2 Siemens Industry, Inc.
Specifications
Power Supply
Supply voltage 24 Vac, 50 to 60 Hz or 24 Vdc
Maximum voltage tolerance ±20%
Power consumption
Normal operation 2.5W
On power-up 6 VA
Switch-on current (transient) 250 mA
Primary fuse External
Control Signal On/off pulse width modulation (PWM)
Product Data
Stroke Maximum 0.18-inch (4.5 mm)
Positioning time @ 68°F (20°C) 270 seconds
Manual adjustment None
Position when de-energized
STA73U Actuator shaft extended, valve closed
STP73U Actuator shaft retracted, valve open
Nominal force 22.5 lbf (100 N)
Maintenance None required
Dimensions (H × W × D) 2.9 in × 2.6 in × 1.7 in (74 × 65 × 44 mm)
Weight 0.40 lb (0.18 kg)
Materials Cover and base Polycarbonate
Electrical Connection
Connecting cable (fixed) Stranded conductor
3.3 ft (1.0 m), 2 × 0.02-in
2
(0.50 mm
2
)
Environmental
Conditions
Conditions of use NEMA 3 (IP54)
Permissible temperature of media in valve 34°F to 230°F (1°C to 110°C)
Operation
Temperature 41°F to 122°F (5°C to 50°C)
Humidity < 85% rh
Storage
Temperature 41°F to 122°F (5°C to 50°C)
Humidity 5% to 100% rh
Transport
Temperature –4°F to 140°F (–20°C to 60°C)
Humidity < 95% rh
Mounting
Method Bayonet-mount with adapter ring
Orientation Any, 360°
Agency Approvals
Conforms to CE requirements
Mechanical Design
The STA73U and STP73U solid expansion medium actuators have no rotating parts,
and in the absence of friction, there is no noise and wear is kept to a minimum.
Operation
The STA73U and STP73U Thermic Actuators are noise-free and maintenance-free.
When the control signal is applied to the actuator, the temperature of the heating
element rises, which causes the solid expansion medium to expand. It transfers its
stroke directly to the installed valve.
The valve starts to open after preheating for approximately 1 minute if the heating
element is switched on in a cold state (room temperature), and achieves the maximum
stroke after another approximately 3-1/2 minutes. At power-off, the expansion element
cools down and the spring closes the valve.