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A STRO 2 S E R I E S HOT WATER R E- CIRCU L ATIO N

SYSTEM

I N S TA L L AT I O N A N D O P E R AT I N G I N S T R U C T I O N S

1.0

Typical application

2 .0 How it works

3 .0 Technical data

4 .0 Installation

1.0 typical applications

Armstrong Astro 2 Hot water

re-circulation systems au-

tomatically circulate water

through domestic hot water

distribution pipes. This helps

to ensure that everyone in the

household has "instant" hot wa-

ter 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.

2.0 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 tem-

perature reaches 105°f (41°c), or the current timed activation

period ends.

5 .0 Operation

6.0 Setting the clock/timer

7.0 Replacement parts

3 .0 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

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

*Certified to nsf-372 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: july 23, 2015

Supersedes: 10.812

Date: july 09, 2015

6.0 ft (1.8 m) power cord, molded

duplex plug with ground

Indoor use only

150 psi (1034 kPa)

39°f (4°c) to 104°f (40°c)

230°f (110°c)

85°f (29°c) ±10%

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*

Ceramic

Noryl

Ceramic

epdm