Armstrong ASTRO 220SSU User manual

Installation
and operating
instructions
Astro 2, 3-speed
circulator models
File No: 10.89
Date: july 27, 2012
Supersedes: 10.891
Date: july 18, 2012

contents
1.0 Introduction 4
2.0 Installing 4
2.1 Terminal box 4
2.2 Electrical wiring 5
3.0 Check valve removal (optional) 5
4.0 Start up 5
5.0 Installation troubleshooting guide 6

installation &
operating instructions
Astro 2, 3-speed
circulator models
4
These installation and operating instructions are applicable to the
following Astro 2 models.
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
23-speed circulators are designed for closed hydronic or pota-
ble water systems. Their intended use is for circulating water or
glycol solutions. For pumping domestic water use non-ferrous
no lead bronze or stainless steel body pump construction.
The Astro 2 3-speed operates extremely quietly and is lubri-
cated by the system liquid being pumped by the circulator.
These circulators are designed to work at temperatures and
pressures up to 230°f (110°c) and 150 psi. For no lead bronze
and stainless steel pumps used in potable water systems, it is
recommended that the operating temperature of the fluid be
kept as low as possible (i.e. below 150°f/66°c) to avoid precipi-
tation 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 ecient operation.
See installation examples.
The circulator shaft must always be in a horizontal position.
(The piping can be in a horizontal or vertical run.) Isolation
valves should be installed on the discharge and suction side of
the pump to facilitate service.
2.1 terminal box
Always install the circulator with the terminal box above or be-
side the motor. If the terminal box is under the motor as initially
mounted, remove the motor mounting screws and rotate the
motor to the proper position. (See example.)
Ensure the gasket is intact and seated before evenly retighten-
ing the mounting screw to 4.5 - 5.5 lb/ft (6 - 7.5 Nm). To ensure
the rotor still spins freely, temporarily remove the plug (located
in the middle of the nameplate), insert a flat head screwdriver
into the slot in the end of the rotor shaft and turn.
Retighten the plug to 1.5 - 2 lb/ft (2 -2.7 Nm). Ensure no water
leak at all sealing contacts.
incorrect installationscorrect installations
astro 2 models
model power supply rating
astro 220ssu
115v, 60hz
33w, 0.29a
astro 225ssu 83w, 0.69a
astro 225bs ½" swt 75w, 0.64a
astro 225bs O" swt 75w, 0.64a
astro 230ss 97w, 0.81a
astro 230ci 97w, 0.81a
astro 230ci-r 97w, 0.81a
astro 250ss 117w, 0.98a
astro 250ci 117w, 0.98a
astro 250ci-r 117w, 0.98a
astro 280ci 218w, 1.9a
astro 290ci 218w, 1.9a

installation &
operating instructions
Astro 2, 3-speed
circulator models
5
Do not hang items or articles of clothing on the pump as air
must be able to circulate freely through the motor. Do not
operate the circulator without the motor plug installed.
2.2 electrical wiring
The electrical wiring must be installed strictly in accordance
with national electrical codes, local codes and regulations.
1Electrical installation should be conducted by a
qualified electrician.
2Always make sure electric power is disconnected before
wiring the circulator.
The motor is designed for 60 Hz, 1phase, 115 volt power.
Wire shall be 14 to 16 gauge solid wire or 16 to 18 gauge
stranded wire.
To wire, loosen the screw from the terminal box cover and
remove the screw and cover.
Insert wires through supplied liquid-seal connector (installed)
or included ½" npt adaptor or other strain relief connector
(not provided).
Strip ³/af" of insulation from the ends of the three wires to
be connected.
To insert the wires into the terminal strip, flip the terminal lever
away from the wire opening and press down firmly. Insert the
stripped wire into the opening and release the lever. Tug on the
wire gently to ensure it is secured.
Connect the hot wire to terminal 'l', the neutral wire to terminal
'n', and the ground wire to terminal
f
.
Tighten the terminal box cover.
The motor is thermally protected so overload protection is not
necessary. All that is required is a fused plug or circuit breaker
in the power line. Electrical information can be found on the
nameplate of the motor.
3.0 check valve removal (optional)
Using a pair of needle-nose pliers, grip one of the flat wings of
the check valve and gently pull the valve out vertically.
4.0 start up
These circulators are maintenance free. Self-lubricated by the
system fluid, these circulators have no seals to leak or coupling
to break.
A proper installation practice recommends to thoroughly flush
the system clean of all foreign materials prior to installing
the circulator.
Fill the system before starting.
plug
1
2
3

installation &
operating instructions
Astro 2, 3-speed
circulator models
6
Speed setting of Astro 2 3-speed circulators:
The speed of these pumps can be adjusted with a 3-speed
rotary switch. On speed setting 1, the pump operates at
approximately half the performance of the speed setting 3
(maximum speed) and consumes about half the power of full
speed operation.
warning
Never operate the circulator dry as permanent damage may
occur. Never shut o the discharge or restrict suction flow
while the circulator is operating.
The venting of the rotor chamber may be done automatically.
However, to assure proper and faster venting of this circulator,
we recommend the manual venting procedure as follows:
1Place a container under the back of the circulator to catch
any water that may run out.
2Be sure power to the circulator is o at the fuse or
circuit breaker.
3Loosen plug on the back of the motor but do not remove.
4Continue until water appears.
5After a sucient amount of water free of air bubbles has
passed, retighten the plug.
6The circulator can now be started.
liquid temperature minimum inlet pressure
167°f (75°c) 1.6 ft (0.5 m)
194°f (90°c) 9.2 ft (2.8 m)
230°f (110°c) 36.1 ft (11.0 m)
fault possible cause remedy
Noise from radiator Excessive pressure passing the thermostatic
valve.
• Reduce the speed setting. Flow decreases will
reduce system pressure and eliminate the noise.
The radiator is not giv-
ing o any heat
The thermostatic valve is jammed or blocked. • Shut o all other radiators in the system, and
set the pump at maximum speed.
• Once the blockage has been dislodged
reopen the radiators and adjust pump to origi-
nal speed setting.
The heating system is not balanced. • Re-assess the system. Fit new commissioning
valves on all radiators (may be integrated in the
thermostatic valves) to enable an even distribu-
tion of the flow.
Pump generates little
or no output
Incorrect discharge direction. • Turn pump 180°
Dirty impeller • Open pump and clean impeller
note: Close isolation valves if present
Suction port blocked • Open pump and clean housing
note: Close isolation valves if present
Outlet blocked • Clean isolation valves
Isolation valve closed • Open isolation valves
Dirty strainer • Clean strainer
Air in the pump • Switch o pump and open bleed screw to vent.
Pump at lowest/medium speed level • Set pump to the next higher speed level.
Pump set point is too low • Increase set point on the pump or controller.
5.0 installation troubleshooting guide

installation &
operating instructions
Astro 2, 3-speed
circulator models
7
fault possible cause remedy
Pump stopped,
no power
Power supply interrupted • Check the power supply. Attach external power control
if necessary.
Fuse tripped or circuit breaker opened • Repair short-circuited wire. Repair loose contact.
• Check for the properly rated fuse.
• Check pump motor and lead.
Pump stopped, power
supply present
Thermal switch has actuated • Reduce ambient temperature.
• Clean blocked or slow rotating pumps.
Pump does not start • Open air vent screw and unlock shaft. Clean pump.
• Increase speed/set point.
• Replace pump.
Noises in system, ther-
mostatic valves/pipes
Pump output too high • Reduce speed level.
• Open bypass/valve.
• Install circuit balancing valves to adjust flow.
• Check pump selection/system. Adjust pump. Check
system /gauges.
• Replace pump.
Noisy pump Air in pump • Open bleed screw and vent pump. Vent and top up
system with water.
• Check expansion tank.
• Install air separator.
Cavitation sounds • Increase inlet pressure.
• Reduce temperature.
• Throttle back pump.
• Reduce speed.
Resonance noises • Use sound insulation material between the pump
and surface to reduce resonance noise. Install
expansion joints. Install fixture to change system’s
natural frequency.
• Adjusts pump speed.
• Replace pump/motor.
Knocking from foreign bodies in the
pump/or on valve
• Clean impeller.
• Adjust valve pressure. Adjust valve spring.
• Turn valve around if installed incorrectly.
• Replace pump.

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