Sterling A0544325 installation manual Overhead Process Considerations, Overhead Piping

Vent

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

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.

Vacuum Breaker

Assembly

Cap

12"Check

Valve	1/8"
	Hole

1/4"
	6" Min.
	Process Return
Strainer	Process Supply

Add check valve if system piping extends 15 feet above reservoir.

Indicates end of STERLCO piping

Page 16 SMC Series Chillers