Coolpak PCA050, Operation Manual

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2-5 Overhead Process Considerations
If your application has chilled water or process piping above the reservoir fill and vent level,
install a standpipe to a point 30 cm above the highest point in the system.
In applications where the process or its piping is 4.6 m or more above the reservoir, you
must take steps to prevent over-pressurization of the reservoir. This
condition can occur on system shutdown when the water in the system drains into the
reservoir.
To prevent this, install a check valve in the unit TO PROCESS line and a vacuum breaker at
the high point of the return FROM PROCESS line. See Figure 7 below for more information.
Note: The reserve capacity of the reservoir can hold a volume equal to 6.1 m
of 25mm pipe .
The reservoir vent & fill line
to be piped 304.8mm above the highest
point of the system. The vent line
must remain open to the atmosphere.
300mm
Add check valve
if system piping
extends 4.6M
above reservoir
150mm
6.35mm
3.18mm
Hole