i n sta l l at i on &
op era t i ng i n str u ct i on s
4
warning
• Prior to installation, read these installation and
operating instructions. Installation and
operation must comply with local regulations and
accepted codes of good practice.
• The use of this product requires experience with and knowl-
edge of the product. Only licensed or trained installers
should install this product.
• For supply Connection, use wires acceptable for at least
90°c (194°f).
• Risk of shock: this pump has not been tested for use in
swimming pools or marine areas.
• To reduce risk of electric shock: Unplug before servicing,
see instructions for proper installation, connect to a prop-
erly grounded, grounding type receptacle only.
• For indoor use only.
• Use copper conductors only.
• Do not install with motor above or below pump body.
• Do no submerge.
• Do not run pump dry.
These installation and operating instructions are applicable to the
following Astro 2 models.
astro 2 models
model
a stro 2 10 ci
a stro 2 10ss
a stro 2 20ssu
a stro 2 25 ssu
a stro 2 25bs ½" sw t
a stro 2 25bs O" sw t
a stro 23 0ss
a stro 23 0 ci
a stro 23 0 ci-r
a stro 250ss
a stro 250 ci
a stro 250 ci-r
a stro 28 0 ci
a stro 28 0ss
a stro 29 0 ci
a stro 29 0ss
a stro 28 0 ci 23 0v
a stro 28 0ss 23 0v
a stro 286ci
a stro 286ss
Astro 2
circulator models
electrical
rating
input
20 0w, 1.7 2 a
20 0w, 1.7 2 a
33w, 0. 29a
83w, 0.6 9a
75w, 0.64 a
75w, 0.64 a
97 w, 0. 81a
97 w, 0. 81a
115v, 6 0hz
Single phase
97 w, 0. 81a
117 w, 0.9 8a
117 w, 0.9 8a
117 w, 0.9 8a
2 18w, 1.9a
2 18w, 1.9a
2 18w, 1.9a
2 18w, 1.9a
2 10w, 0.9a
2 10w, 0.9a
23 0v, 6 0hz
Single phase
370w, 1.6a
370w, 1.6a
1.0 introduction
You are about to install a pump from the finest multi-speed wet
rotor circulator line on the market today. The Armstrong Astro
2 circulators are designed for closed hydronic or potable water
systems. Their intended use is for circulating water or glycol
solutions. For pumping domestic water use non-ferrous lead
free bronze or stainless steel body pump construction.
The Astro 2 operates extremely quietly and is lubricated by the
system liquid being pumped by the circulator.
These circulators except Astro 286 are designed to work at
temperatures and pressures up to 230°f (110°c) and 150 psi.
Astro 286 is designed to work at temperature and pressure
upto 150°f (65°c) and 150psi. For fluid temperature upto 185°f
(85°c), operating current must not exceed 1.35a. For lead free
bronze and stainless steel pumps used in potable water sys-
tems, it is recommended that the operating temperature of the
fluid be kept as low as possible (i.e. below 150°f/65°c) to avoid
precipitation of calcium.
When unpacking the circulator, inspect for any damage that
may have occurred during transit. Check for loose, missing or
damaged parts.
2.0 installing
We recommend that any soldering be done before the pump
is actually installed. This will eliminate the possibility of solder
dropping into the pump body.
Thoroughly flush the system out before installing the circulator.
Before Installing, check that the flow direction of the water
through the pump body matches the arrow on the circulator
body. The circulator is supplied for up discharge installation.
Install the circulator in either the outlet or inlet line to the boiler
or hot water heater. It is important to install these circulators
with the split between the circulator body and the motor in a
vertical position. This ensures efficient operation.
See installation examples.
correct installations
incorrect installations