Watts LFN9-CD User Manual

For Residential and Commercial Health Hazard Applications

ES-LFN9-CD

Job Name

Job Location

Engineer

Approval

LEAD FREE

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Series LFN9-CD

Field Testable Hose Connection
Backflow Preventer

Size: 3⁄4" (20mm) Hose thread

The LFN9-CD is designed to prevent high hazard backsiphon­age backflow and low-head backpressure (10ft. or less) from
contaminating the potable water supply. The LFN9-CD is ideally
suited to prevent backflow associated with hose connections
and may be screwed directly to the sill cock, yard hydrant or
wall hydrant. Typical installations include service sinks, chemical
dispensers, sill cocks and frost proof hydrants.

Watts LFN9-CD features include two independently operating
rubber and stainless steel check valves with an atmospheric
vent located between the check valves. In the event of fouling
of the downstream check valve, leakage would be vented to
atmosphere, thereby, providing a visual indication of failure. The
integrity of the check valves can also be verified by performing
the field test procedure included with the LFN9-CD. The LFN9­CD features Lead Free* construction to comply with the Lead
Free installation requirements.

Contractor

Approval

Contractor’s P.O. No.

Representative

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3⁄4" (20mm) LFN9-CD

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Center Guided

Checks

Features

• Exclusive "Non-removable" design eliminates the need
for break-away set screw

• Center-guided check valves for repeatable seating

• In-line field testable - no special gauges required

• Manually drainable for freeze protection

• Durable brass body with stainless steel checks for

corrosion resistance

• Streamlined design for low pressure drop

• Can be installed vertically or horizontally

• Positive backsiphonage protection

Specifications

Maximum pressure: 125psi (8.6 bars).

Maximum temperature: 180°F (82°C).

Inlet Connection: 3⁄4" (20mm) standard female hose thread

Outlet Connection:

A hose connection backflow preventer shall be installed where
indicated on the plans to prevent the backsiphonage of poten­tially contaminated water. The device shall not be subjected

to continuous pressure (more than 12 hours) or backpressure

(more than 10 feet). The hose connection backflow preventer
shall consist of two independently operating check valves with

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 with­out prior notice and without incurring any obligation to make such changes and modifications on Watts products previously or subsequently sold.

3

⁄4" (20mm) standard male hose thread

Non-removable

Interlocking Spring

Use only with approved hose bibbs or hose fittings having
four or more full American National Hose (NH) threads.

Specifications (cont.)

an intermediate atmospheric vent. The assembly shall be non­removable via the use of an interlocking spring contained in the
backflow preventer. The use of break-away set screws as a
non-removable retention method is not allowed. The hose con­nection backflow preventer shall be in line field testable without
the use of special test gauges or instruments. The Lead Free*
Field Testable Hose Connection Backflow Preventer shall com­ply with state codes where applicable. The device shall meet the

requirements of ASSE Std. 1052 and shall be a Watts LFN9-CD.

*The wetted surface of this product contacted by consumable water
contains less than 0.25% of lead by weight.

Standards

Tested and approved in conformance with Standard 1052 of the
American Society of Sanitary Engineers and by all principal cit-

ies, states, and areas having these requirements.

IMPORTANT: Inquire with governing authorities for local installa­tion requirements.

These devices are not intended for installation where emergency
or temporary water discharge can cause water damage.

Dimensions - Weight

11⁄2"

(38mm)

Weight = .56 lbs.

(.25 kg.)

213⁄16"

(71mm)

Capacity

kPa psi

276 40

241 35

207 30

172 25

138 20

103 15

69 10

Pressure Loss

34 5

0 0

0 1 2 3 4 5 6 gpm
0 4 8 11 15 19 23 lpm

Flow Rate

Rated Flow: 4 gpm

Installations

Sillcock Installation

A Watts Water Technologies Company

ES-LFN9-CD 1305 © 2013 Watts

Chemical Dispenser Installation

USA: Tel: [phone] • Fax: [phone] • www.watts.com

Canada: Tel: [phone] • Fax: [phone] • www.watts.ca