Armstrong Astro 2 Manuale di installazione e istruzioni per l'uso - Pagina 6
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i n sta l l at i on &
op era t i ng i n str u ct i on s
6
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.
Speed setting of Astro 2 3-speed circulators:
(Not applicable for Astro 286)
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.
5 .0 installation troubleshooting guide
fault
possible cause
Noise from radiator
Excessive pressure passing the thermostatic valve.
The radiator is not
The thermostatic valve is jammed or blocked.
giving off any heat
The heating system is not balanced.
Pump generates
Incorrect discharge direction.
little or no output
Dirty impeller
Suction port blocked
Outlet blocked
Isolation valve closed
Dirty strainer
Air in the pump
Pump at lowest/medium speed level
Pump set point is too low
Astro 2
circulator models
wa r n i n g
Never operate the circulator dry as permanent damage may
occur. Never shut off 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
1 Place a container under the back of the circulator to catch
any water that may run out.
2 Be sure power to the circulator is off at the fuse or
circuit breaker.
3 Loosen plug on the back of the motor but do not remove.
4 Continue until water appears.
5 After a sufficient amount of water free of air bubbles has
passed, retighten the plug.
6 The circulator can now be started.
liquid temperature
150°f (65°c)
167 °f ( 75°c)
194°f (9 0°c)
230°f ( 110°c)
remedy
• Reduce the speed setting. Flow decreases will reduce
system pressure and eliminate the noise.
• Shut off 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 original speed setting.
• Re-assess the system. Fit new commissioning valves
on all radiators (may be integrated in the thermostatic
valves) to enable an even distribution of the flow.
• Turn pump 180°
• Open pump and clean impeller
note: Close isolation valves if present
• Open pump and clean housing
note: Close isolation valves if present
• Clean isolation valves
• Open isolation valves
• Clean strainer
• Switch off pump and open bleed screw to vent.
• Set pump to the next higher speed level.
• Increase set point on the pump or controller.
minimum inlet pressure
3 .0 f t (0.91 m)
4 . 4 f t ( 1.3 4 m)
9 . 2 f t (2. 8 m)
36.1 f t ( 11.0 m)