Armstrong Astro 2 Series 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
Environment
Max. Working Pressure
Ambient Temperature
Max. Water Temperature
Low Temperature Switchpoint
High Temperature Switchpoint
Clock/Timer
Timer Settings
Manual Override
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
Pump Shaft
Impeller
Bearings
Bearing Seal
*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.)
5.0 ft (1.5 m) power cord, molded duplex plug with ground
Indoor use only
100 psi (689 kPa)
39°F (4°C) to 104°F (40°C)
140°F (60°C)
1
85°F (29°C) ±10%
1
105°F (40°C) ±10%
12-hour analog clock with AM/PM indication
Individual mechanical toggles for each 15 minute interval over 24 hours
3 position slide switch; on/auto/off
Lead Free Bronze* or Stainless Steel*
Polyether Imide (PEI)
Ceramic
Ceramic
EPDM
INSTALLATION AND OPERATING INSTRUCTIONS
Page 1 of 5
FILE NO.: 10.812
DATE: Oct. 20, 2010
SUPERSEDES: 10.812
DATE: Apr. 20, 2010