Armstrong ASTRO 280CI Installations- und Betriebsanleitung - Seite 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

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.

wa r n i n g

Never operate the circulator dry as permanent damage may

occur. Never shut off the discharge or restrict suction ﬂ ow

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:

5 .0 installation troubleshooting guide

fault

possible cause

Noise from radiator

Excessive pressure passing the thermostatic

valve.

The radiator is not giv-

The thermostatic valve is jammed or blocked.

ing off any heat

The heating system is not balanced.

Pump generates little

Incorrect discharge direction.

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, 3-speed

circulator models

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 suffi cient amount of water free of air bubbles has

passed, retighten the plug.

6 The circulator can now be started.

liquid temperature

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 origi-

nal speed setting.

• 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 ﬂ ow.

• 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

1.6 f t (0.5 m)

9 . 2 f t (2. 8 m)

36.1 f t ( 11.0 m)