Loop Piping Installation
One of the main advantages of using mini chillers is the ability to have long water piping
installations. However, it is important to check that the water pump head pressure capability is
adequate to pump the water through the pipe network. The longer the pipe length is, the higher
is the pressure drop. If the pump head is insufficient, it may be necessary to change the water
pump itself. See Section 5.
With such installations, it is also important to check the condition of the automatic air vent valve.
A high pressure drop along such pipe network may result in the return water to have a negative
pressure (i.e. suction vacuum pressure in the buffer tank). Due to the mechanism of the air vent,
air will be drawn into the buffer tank itself! This in turn will cause the pump to be air-locked. A
symptom of such condition is that air will always be purged out of the tank when we manually
open the air vent.
The solution to this problem is to remove the automatic air vent and plug up the hole. Make
sure that all the air trapped are purged out of the system before plugging it. This can be done
by continuously filling up the system with water until no air bubbles comes out of the hole.
Section2 Page 25
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