Instructions / Assembly

S
pecification
An antisiphon pressure vacuum breaker shall be installed
where indicated on the plans to prevent the backsiphonage of
contaminated water. This assembly is not to be used where
a backpressure condition can develop. The assembly shall
incorporate an acetal bonnet with silicone rubber O-ring seal
and silicone rubber seat disc. The valve shall have replaceable
seats. Check assembly shall be guided over its full stroke
by ‘V’ notched guides. The Lead Free* Antisiphon Pressure
Vacuum Breakers shall comply with state codes and standards,
where applicable, requiring reduced lead content. The assembly
shall meet the requirements of ANSI/ASSE Standard 1020,
shall be a Watts Series LF800M4QT, and shall include a freeze
sensor.
Model/Option
FZ Freeze sensor
Materials
Springs Stainless steel
Bonnet Celcon
®
Vent Disc Silicone rubber
Disc Holder Float Polypropylene
Check Valve Disc Silicone rubber
Check Valve Seat Noryl
®
plastic
Body Lead Free* cast copper silicon alloy
Pressure — Temperature
Temperature Range: 33°F to 140°F (0.5°C to 60°C)
Maximum Working Pressure: 150 psi (10.3 bar)
Standards
ANSI, USC Manual Section 10
Approvals
1020
Approved by the Foundation for Cross-Connection Control and
Hydraulic Research at the University of Southern California,
Manual Section 10.
1
⁄2",
3
⁄4", 1
1
⁄4", 1
1
⁄2", 2"; 1" pending
CSA ½" to 2"
Installation
This valve is designed for installation in a continuous pressure
potable water supply system 12" above the highest point of
the downstream piping. The valve must be installed with the
supply connected to the bottom and in a vertical position. Allow
adequate space for periodic inspection, servicing, or testing. The
valve should not be installed in an area where freezing or spillage
can cause damage. Adequate drainage/freeze protection must
be provided in cold weather applications. Pressure at 1.5 psi
(10 kPa) must be exerted against the float spring to seal the float
and air inlet. Do not undersize supply and discharge piping.
NOTICE
Vacuum breakers are not designed, tested, or approved to
protect against backpressure backflow or water hammer
shock. For protection against backpressure backflow, install
Watts LF009 Reduced Pressure Zone Backflow Preventer. For
protection against water hammer shock, install a Watts Series
LF15 Water Hammer Arrestor using good plumbing practice.
Insulated Enclosure
WattsBox Insulated Enclosure can be used for additional freeze
protection. For more information, refer to ES-WB at watts.com.
LF800M4QT
Hood Screws
Hood
Bonnet
Bonnet O-ring
Vent Spring
Vent Seal
Vent Float
Check Spring
Retainer
Check Spring
Check
Disc Holder
Check Disc
Seat
Seat O-ring
Body
Outlet Shutoff
Valve
Test Cock
Test Cock
Inlet Shutoff
Valve
Celcon is a registered trademark of Celanese Corporation.
Noryl is a registered trademark of SHPP Global Technologies B.V.