Install Instructions

5.0 Operation 4
6.0 Setting the clock/timer 5
7.0 Replacement parts 5
1.0 Typical application 1
2.0 How it works 1
3.0 Technical data 1
4.0 Installation 2
1.0 typical applications
Armstrong Astro 2 Hot wa-
ter 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.
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 o 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.
3.0 technical data
technical data
Power Connection
6.0 ft (1.8 m) power cord, molded
duplex plug with ground
Environment Indoor use only
Max. working pressure 150 psi (1034 kPa)
Ambient temperature 39°f (4°c) to 104°f (40°c)
Max. water temperature 230°f (110°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/
o
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 Ceramic
Impeller Noryl
Bearings Ceramic
Bearing seal epdm
*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 11, 2018
Supersedes: 10.812
Date: february 24, 2017
ASTRO 2 SERIES HOT WATER RE-CIRCULATION
SYSTEM
|
INSTALLATION AND OPERATING INSTRUCTIONS