PCA Series Chillers
Page 17
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 1’ (30 cm) above the highest point in the system.
In applications where the process or its piping is 15 feet (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
20 feet
(6.1 m)
of 1-inch
(2.5 cm)
pipe
.
Figure 7: Overhead Piping
Vent
6" Min.
Process Return
Process Supply
1/8"
Hole
Vacuum Breaker
Assembly
Cap
Check
Valve
1/4"
12"
Add check valve
if system piping
extends 15 feet
above reservoir.
Strainer
The reservoir vent & fill line
to be piped 12" above the highest
point of the system. The vent line
must remain open to the atmosphere.
Indicates end of AEC piping
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