Watts LF007 Serie Manuel D'installation, D'entretien Et De Réparation page 2

Installation Guidelines
Indoors
Series LF007 can be installed in either vertical or horizontal position.
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.
(See Figure 1.) Install valve inline with 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.
Series LF007 must be tested periodically in compliance with local
codes, but at least once a year or more often depending upon
system conditions.
NOTICE
Fire Protection System Installations. The National Fire Protec-
tion Agency (NFPA) Guidelines require a confirming flow test to be
conducted whenever a "main line" valve such as the shutoff valves
or a backflow assembly have been operated. Certified testers of
backflow assemblies must conduct this test. The trim valves of the
detector meter bypass line, on assemblies so equipped, should be
shutoff during the confirming flow test. When the test is completed,
the trim valves must be returned to a fully open position.
Outside Building Above Ground
In an area where freezing conditions do not occur, Series LF007
can be installed outside of a building. (See Figure 2.) The most
satisfactory installation is above ground and should be installed in
this manner whenever possible. In an area where freezing conditions
can occur, Series LF007 should be installed above ground in an
insulated enclosure.
Annual inspection of all water system safety and control valves is
required and necessary. Regular inspection, testing, and cleaning
assures maximum life and proper product function.
Parallel
Consult local codes for approval of a parallel installation. (See
Figure 3.) Two or more Series LF007 smaller size valves can be
piped in parallel (where approved) to serve a larger supply pipe
main. This type of installation is employed whenever it is vital to
maintain a continuous supply of water or where interruptions for
testing and servicing would be unacceptable. Other advantages
include providing increased capacity where needed beyond that
provided by a single valve and testing or servicing of an individual
valve without shutting down the complete line. For two-valve instal-
lations the total capacity should equal or exceed that required by
the system.
The quantity of valves used in parallel should be determined by
the engineer's judgment based on the operating conditions of a
specific installation.
2
Figure 1
Meter
Series 77F-DI-FDA-125
Figure 2
WattsBox Insulated Enclosures
Available in Aluminum or Fiberglass.
For more information, refer to ES-WB at watts.com.
Figure 3
Strainer Series 77F-DI-FDA-125
NOTICE
The flange gasket bolts for the gate valves should be retightened
during installation as the bolts may have loosened due to storage
and shipping.
Strainer