Instructions / Assembly

Series LF07S
Residential Fire Sprinkler
Dual Check Backflow Preventer
Sizes: 1" – 2"
The Watts Model LF07S Residential Fire Sprinkler Dual Check
Backflow Preventer is designed for non-health hazard [i.e., pol-
lutant] application on potable fire sprinkler service connections
to protect against possible backsiphonage conditions that could
inadvertently drain the fire sprinkler system.
Approvals – Standards
Please consult Local Governing Code for proper installation and
agency code requirements,
ANSI/NFPA 13, 14, 15, 20, 22, and 24 Compliant -
All Sizes Applicable
End Connections – National Pipe Thread Taper ANSI B1.20.1
Pressure – Temperature
Max. Working Pressure: 175psi (12.1 bar) 1
1
⁄2" & 2"
160psi (11.03 bar) 1" & 1
1
⁄4"
Min. Working Pressure: 10psi (0.69 bar)
Hydrostatic Test Press: 700psi (48.3 bar)
Temperature Range: 33°F to 140°F (0.5°C to 60°C)
1" & 1
1
⁄4" 33°F to 180°F (0.5°C to 82°C) 1
1
⁄2" & 2"
Specifications
The Lead Free* Dual Check Valve Backflow Preventer shall be
ASSE
®
Listed 1024 and be UL Classified. The main body shall
be Lead Free* brass featuring replaceable seats and silicone seat
discs. The check assemblies shall have captured springs to pre-
vent injury. The Dual Check Valve shall be a Watts Model LF07S.
ES-LF07S
Job Name
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Contractor
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Job Location
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Approval
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Engineer
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Contractor’s P.O. No.
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Approval
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Representative
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2" LF07SU2-2
1" LF07SU2-2
LEAD FREE
*
Sizes Applicable: 1", 1
1
⁄2" & 2" Only
All Sizes Applicable
Sizes Applicable: 1" Only
B64.6
Materials
Body: Lead Free* Brass
Elastomers: Silicone
O-Rings: EPDM or Buna N
Check Modules: Engineered Composite
Springs: Stainless Steel
NOTICE
The Model LF07S is typically installed for service on residential fire
sprinkler systems. It is recommended this device is installed after
a water meter and/or isolation shutoff valve with installation tech-
niques that comply with the latest edition of the Uniform Plumbing
Code. Please consult Local Governing Code for proper installation
and agency code requirement.
Watts product specifications in U.S. customary units and metric are approximate and are provided for reference only. For precise measurements,
please contact Watts Technical Service. Watts reserves the right to change or modify product design, construction, specifications, or materials with-
out prior notice and without incurring any obligation to make such changes and modifications on Watts products previously or subsequently sold.
*The wetted surface of this product contacted by consumable
water contains less than 0.25% of lead by weight.
NOTICE
Inquire with governing authorities for local installation requirements
The information contained herein is not intended to replace the full
product installation and safety information available or the experience
of a trained product installer. You are required to thoroughly read all
installation instructions and product safety information before begin-
ning the installation of this product.
NOTICE
Engineering Specification