Astro 2 Series: Wet Rotor Circulators

A hydronic circulator that conserves energy and eliminates maintenance. Armstrong’s Astro 2 Circulator is intended for circulating water or ethylene glycol solutions in closed hydronic or solar heating systems. It is designed with no mechanical seals or couplers to replace, and no lubrication is required. The Astro 2 series is available in three material constructions for residential, small industrial and commercial installations. Choose from cast iron or lead free bronze or stainless steel models for solar and domestic applications.

Features Efficient/Quiet Operation Universal Flange to Flange Dimension Cast Iron or Lead Free Bronze or Stainless Steel Construction ETL Listed (conforms to UL and certifies to CSA) Benefits No mechanical seals to leak No couplers to break No lubrication 3 speed selection Removable check valve (except on sweat connection pumps) Direct replacement of Armstrong and over 90 competitive circulators Vent plug for initial purging if required Thermally protected motor

Astro 225BS 1/2” SWT

Astro 225BS 3/4” SWT

Astro 220SSU

Astro 225SSU

Astro 230SS

Astro 250SS

Astro 230CI

Astro 230CI-R

Astro 250CI

Astro 250CI-R

Armstrong Astro 2 3-speed circulators provide unmatched performance over a wide range of head and flow requirements. The 3-speed design allows users to match the requirements of an installation exactly, and also helps with:

Reduced Inventory – the complete range of 10 Astro 2 3-speed circulators replaces 93 models of competitors’ pumps

Adaptability – After a circulator is installed you might need to change the performance to accommodate:

• Over/under estimated system resistance in the original design • Increased number of zones due to a building addition •Addition of system elements such as an indirect hot water tank or spa

With Astro 2 3-speed units installed you can easily change the operating speed to handle these changed performance requirements.

reduced installation costs

Astro 2 circulators (except sweat connection models) include a removable check valve that eliminates the need for additional check valves in the system. For replacement installations, the check valve can be removed as required.

compliance with lead-free regulations

Lead-free bronze and stainless steel models of Astro 2 certified <0.25 weighted average percent lead and complies with California Health and Safety Code Section 116875 (commonly known as AB1953).

3-speeds

Reduce your inventory with a variety of performance curves. Ten pumps replace 93 circulators. Correct design issues in the field by adjusting the circulator output.

removable check valve

Reduce costs by eliminating multiple system check valves. Helps prevent reverse flow and induced heat migration.

easy connection

Models are available with union, sweat or flange connections. Models are also available with rotated flanges for installation in tight locations, where clearance is an issue.

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