1314-900 Revision BA
250W Precision Calorimeter
14
7.
Allow the pump to circulate liquid for at least 10 minutes in efforts to purge air from the
system.
8.
Look for trapped air bubbles.
The gear pump inside the chiller flows so fast that air streams past the bleed block and can
remain entrapped in the flow creating bubbles throughout the system. This is normal and
can be mitigated by slowing the flow down using the flow valve adjust knob or by
pinching either the inlet or outlet hose and observing the bubbles in the flow as they are
encouraged to disappear using this technique. This isn’t as easy as it sounds so take your
time. Otherwise, the system can be left to run for several hours and usually the bubbles will
clear themselves out with time.
9.
When the bubbles disappear the pump should be fully primed. The displayed flow valve from
the Iguana Manager program should now display a value around .5 GPM. If not, adjust the
flow adjust knob located in Figure 12 until 0.5 to 0.55 GPM is established.
Figure 11: Look for trapped air bubbles
