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Installation Guidelines
Indoors
The series can be installed in either vertical or horizontal
position, as shown in Figure 1. Approvals may vary by size
or model. Refer to ES-709. ES-LF709, and ES-709DCDA for
complete installation approval details.
Always install the valve in an accessible location to facilitate
testing and servicing. Do not install the unit in a concealed
location.
Pipelines should be thoroughly flushed to remove foreign material
before installing the unit. A strainer should be installed ahead of
the backflow preventer to prevent the disc from unnecessary
fouling. Install valve inline with the arrow on valve body pointing
in the direction of flow.
CAUTION
!
Do not install with a strainer when the backflow preventer is
affixed to seldom-used water lines that are called upon during
emergen cies, such as fire sprinkler lines.
The series must be tested periodically in compliance with local
codes, but at least once a year or more often depending upon
system conditions.
Outside Building Above Ground
In area where freezing conditions do not occur, the series
can be installed outside of a building. The most satisfactory
installation is above ground and should be installed in this
manner whenever possible.
Avoid installing backflow preventers in pits unless absolutely
necessary and then only when approved by local codes. In
such cases, a modified pit installation is preferred or an above
ground insulated enclosure, as shown in Figure 2.
Parallel
Two or more assemblies may be piped in parallel (where
approved) to serve a large supply pipe main, as shown in Figure
3. This type of installation is employed whenever it is vital to
maintain a continuous supply of water where interruptions
for testing and servicing would be unacceptable. It also has
the advantage of providing increased capacity where needed
beyond that provided by a single valve.
For two valve installations the total capacity of the devices
should equal or exceed that required by the system. The
capacity table shows the size of the assemblies required to
meet a certain capacity. The quantity of devices used in parallel
should be determined by the judgment of the compliance
engineer, based on the operating conditions of a specific
installation.
Capacity Required for System
Total capacity provided with dual valve installations of various sizes
450 GPM
640 GPM
1000 GPM
Two 2
⁄
"
Two 3"
Two 4"
1
2
devices
devices
devices
2
2000 GPM
3000 GPM
5000 GPM
Two 6"
Two 8"
Two 10"
devices
devices
devices
Figure 1
Horizontal
Meter
Vertical
Figure 2
WattsBox Insulated Enclosures
Available in Aluminum or Fiberglass.
For more information, refer to ES-WB at www.watts.com.
Figure 3
LF709S
Strainer
LF709S
Strainer
709/LF709
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