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Page 16
SMC Series Chillers
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 6 on Page 18 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 6
Overhead Piping
V
ent
6" Min.
Process Return
Process Supply
1/8"
Hole
V
acuum 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 STERLCO piping