Technical Specifications
The Astro Series Wet Rotor Circulators have a flow range of 0 to 20 USgpm (0 to 1.26 L/s) and a head range of 0 to 32 ft (0 to 9.8 m). They operate with a 115 V, single-phase, 60 Hz motor. The maximum fluid temperature is 230°F (110°C), and the maximum working pressure is 140 psi (965 kPa).

Materials of Construction
The pump body is made of cast iron for closed systems and bronze for open systems. The impeller is constructed from glass-filled polypropylene, the shaft from stainless steel, and the bearings from graphite. The gasket material used is EPDM.

Dimensions and Weights
The document provides detailed dimensions and weights for various models, including Astro 20B050S, Astro 25B050S, Astro 20B075S, and others. Connection types include sweat and union, with sizes ranging from 1/2" to 1 1/4" NPSM.

Typical Specifications
The Armstrong Astro Series circulating pumps are available in models with bronze or cast iron bodies and polypropylene impellers. They are UL listed and CSA approved, operating at 115 V/single phase/60 Hz.

Motor Data
The motor speed varies by model, with the Astro 20 operating at 3400 rpm and the Astro 70 at 2800 rpm. Full load amp draw ranges from 0.48 A to 1.0 A, with power ratings from 1/25 hp to 1/20 hp.

Performance Curves
Performance curves are provided for all Astro Sweat Models, Union Models, and Flanged Models. All models are single speed.

Recommendations
It is recommended to keep the operating temperature of the fluid for open (potable) systems below 150°F (65°C) to prevent calcium precipitation due to varying water conditions.

Contact Information
For more information, contact Armstrong locations worldwide or visit their website at www.armstrongpumps.com.