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INSTALLATION AND OPERATING INSTRUCTIONS
Astro 2 Series - Hot Water Re-circulation System
TYPICAL APPLICATIONS
Armstrong Astro 2 hot water re-circulation systems automatically circulate
water through domestic hot water distribution pipes. This helps to ensure that
everyone in the household has “instant” hot water at the tap when they need
it, while also helping to conserve water and save water heating energy costs.
All systems are assembled, wired, tested, and then shipped from the factory,
ready for installation.
HOW IT WORKS
In normal operation, the Astro 2 automatically starts re-circulating water throughout the hot water distribution system
whenever the timer enables activation. The timer can be set for one or more activation periods per day. An activation
period consists of a multiple (up to 96) of 15 minute time intervals. The timer includes manual on and off overrides to
normal automatic operation.
Some models are equipped with an Aquastat, intended for use on metallic piping. The Aquastat enables operation only
when the sensed water temperature is below 85°F (25°C). Once activated, the circulator operates until either the water
temperature reaches 105°F (41°C), or the current timed activation period ends.
TECHNICAL DATA
TECHNICAL DATA
Power Connection
5.0 ft (1.5 m) power cord, molded duplex plug with ground
Environment
Indoor use only
Max. Working Pressure
100 psi (689 kPa)
Ambient Temperature
39°F (4°C) to 104°F (40°C)
Max. Water Temperature
140°F (60°C)
Low Temperature Switchpoint
1
85°F (29°C) ±10%
High Temperature Switchpoint
1
105°F (40°C) ±10%
Clock/Timer
12-hour analog clock with AM/PM indication
Timer Settings
Individual mechanical toggles for each 15 minute interval over 24 hours
Manual Override
3 position slide switch; on/auto/off
1
High/low temperature switch points are as measured on pipe surface with the Aquastat (-TA models only).
MATERIALS OF CONSTRUCTION (Wetted Parts)
Pump Casing
Lead Free Bronze* or Stainless Steel*
Pump Shaft
Polyether Imide (PEI)
Impeller Ceramic
Bearings Ceramic
Bearing Seal
EPDM
*Complies with section 116875 of the California Health and Safety Code and
Vermont Act 193 (Lead content of wetted surface is 0.25% or less.)
FILE NO.:
10.812
DATE:
Oct. 20, 2010
SUPERSEDES: 10.812
DATE:
Apr. 20, 2010
