Watts 007M1DCDA - Manual (Page 2)

Installation Instructions
2" - 3" 007DCDA
Indoors –
Figure 1
Watts Series 007DCDA may be installed in either a vertical or
horizontal position. Pipe lines should be thoroughly flushed to
remove foreign material before installing the unit. A strainer
should be installed as shown, ahead of backflow preventer to
prevent disc from unnecessary fouling. Install valve in the line
with arrow on valve body pointing in the direction of flow.
For indoor installations, it is important that the valve be easily
accessible to facilitate testing and servicing. Do not install in a
concealed location.
CAUTION: Do not install with strainer when backflow preventer
is used on seldom-used water lines which are called upon dur-
ing emergencies, such as fire sprinkler lines, etc.
It is important that Series 007DCDA be tested periodically in
compliance with local codes, but at least once a year or more
often depending upon system conditions.
Note Fire Protection System Installations:
The National Fire Protection 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 shut off during the
confirming flow test. When the test is completed the trim valves
must be retuned to a fully open position.
Outside –
Figure 2
In an area where freezing conditions do not occur, Series
007DCDA can be installed outside of a building. The most sat-
isfactory installation is above ground and should be installed in
this manner whenever possible.
In an area where freezing conditions can occur, Series
007DCDA should be installed above ground in an
insulated enclosure.
Parallel –
Figure 3
Two or more Series 007DCDA smaller size valves may be piped
in parallel (where approved) to serve a larger supply pipe main.
This type of installation is employed whenever it is vital to main-
tain 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 pro-
vided by a single valve and permits testing or servicing of an
individual valve without shutting down the complete line. For
two valve installations 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 judgement based on the operating conditions of
a specific installation. (See literature F-FC regarding flow curves)
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.
Installation Note:
The flange gasket bolts for the gate valves should be
retightened during installation as the bolts may have
loosened due to storage and shipping.
2
Figure 1
Figure 2
Figure 3
Main
Strainer Meter
Now available, WattsBox Insulated Enclosures,
for more information, send for literature ES-WB.
WattsBox
12" minimum
refer to local codes
Vertical Flow Up
Watts
2", 2 1 ⁄
2
", 3" 007DCDA
Minimum 12"
Watts
2", 2 1 ⁄ 2 ", 3" 007DCDA
Strainer
Series 77F-D-FDA