Install Instructions

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 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:
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 o 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 su cient amount of water free of air bubbles has
passed, retighten the plug.
6
The 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 fl ow.
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