Watts LF919 - Manual (Page 2)

2
Installation Instructions
Series 919 and LF919
1 ⁄
4
" – 2" (8 – 50mm)
Air Gap
Strainer
Reduced Pressure Zone Assemblies
Indoor Installation
For indoor installations, make sure the Series 919 and LF919 is
easily accessible to facilitate testing and servicing. Do not install in
concealed locations. If the location of the Series 919 and LF919
is parallel and close to the wall, make sure the test cocks are eas-
ily accessible, and the drain line can adequately drain if required.
An air gap and drain line (see literature ES-AG/EL/TC) are piped
from the relief valve connection as shown, allowing evidence of
discharge to be clearly visible and preventing the occurrence of
water damage.
Outdoor, Above Ground Installation
For outdoor installations, it is recommended that you install the
Series 919 and LF919 where there are no freezing conditions and
above ground whenever possible.
You must install the Series 919 and LF919 in an accessible loca-
tion to facilitate testing and servicing. The installation must also
allow for adequate drainage from the air gap and the discharge
line if needed.
WARNING:
1. Do not allow the drain line to empty directly into a drainage
ditch, sewer system, or sump.
2. Do not install the Series 919 and LF919 in any location where
any part of the unit could become submerged in standing
water.
Parallel Installation
For parallel installations, you can install two or more small sized
Series 919's and LF919's (when approved) to serve a large supply
pipe main. You can use this type of installation in an application
where increased capacity beyond that provided by a single valve
is required. Additionally, this type of installation permits testing
and/or servicing of a single valve without shutting down the com-
plete line.
The number of Series 919 and LF919 units installed in parallel
should be determined by the engineer's judgement, based on the
operating conditions of a specific application.
NOTE: The total capacity of all the units installed in the application
should equal or exceed that required by the system.
Now available, WattsBox Insulated Enclosures,
for more information, send for literature ES-WB.
FIBERGLASS WattsBox
Min. 12"
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.
Meter
Indoor Installation
Outdoor Installation
Parallel Installation
12" (300mm) Minimum
(refer to local codes)
Watts
1 ⁄
4
" – 2" (8 – 50mm) 919
Watts
1 ⁄
4
" – 2"
(8 – 50mm)
919AQT
Watts
1 ⁄
4
" – 2" 919
(8 – 50mm)
Min. 12" (300mm)