Install Instructions

ManualsBrandsWatts ManualsBackflow Preventers3/8 LFN9C, Chrome Plated Dual Check Vacuum Breaker

Watts Model N9/LFN9 and

Model NLF9/LFNLF9

Backflow Preventers

ATTENTION INSTALLER: After installation, please leave this Instruction Sheet for occupant’s information.

IS-N9-NLF9

Watts Model N9/LFN9 and

Model NLF9/LFNLF9

Backflow Preventers

ATTENTION INSTALLER: After installation, please leave this Instruction Sheet for occupant’s information.

IS-N9-NLF9

Installation Instructions

Before installing, flush out pipe lines to remove scale and other foreign

matter. The valves can be installed horizontally or vertically. Install the

valve in the line with the arrow on valve body pointing in the direction

of flow. Model NLF9/LFNLF9 is furnished with inlet thread gasket and

pipe dope or Teflon

tape should not be used. However, Teflon

tape

is recommended for the pipe threads of Model N9/LFN9. To maintain

the valve discs in a clean operating condition, we strongly recommend a

pipe line strainer be installed in the supply line before the Model N9/LFN9

or Model NLF9/LFNLF9.

Important

These devices are not intended for installation where emergency or tem-

porary water discharge can cause water damage because they are not

designed to be spillage free under all service conditions. For this reason

and for maintenance accessibility, these devices must not be installed

inside a wall or any concealed location.

This device should be installed at the furthermost downstream end of

the supply pipe or fixture where temporary spillage due to critical flow

pressure conditions can be discharged harmlessly. Also, the backflow

preventer will operate most satisfactorily when located as far down-

stream as possible, because any backpressure is minimized.

Application

Watts

⁄8" (10mm) Model NLF9/LFNLF9 is recommended for laboratory

faucets and is not suitable for continuous pressure applications. The

Model N9/LFN9 series are recommended for either continuous or inter-

mittent pressure type installations.

Potable water must be protected from backflow of low hazard sub-

stances used in equipment container, sinks and set tubs. In the event

of negative supply pressure such contaminated fluids will not backflow

to the supply source by backsiphonage. For clarification of low hazard

substances consult Local Plumbing Authority or Health Department.

Temperature and Pressure

Maximum Pressure 150psi (10.3 bar).

Maximum Temperature 140°F (60°C).

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.

Teflon

is a registered trademark of the E.I. Dupont de Nemours & Company.

You are required to thoroughly read all installation instructions and

product safety information before beginning the installation of this prod-

uct. FAILURE TO COMPLY WITH PROPER INSTALLATION AND

MAINTENANCE INSTRUCTIONS COULD RESULT IN PRODUCT

FAILURE WHICH CAN CAUSE PROPERTY DAMAGE, PERSONAL

INJURY AND/OR DEATH. Watts is not responsible for damages result-

ing from improper installation and/or maintenance.

Local building or plumbing codes may require modifications to the informa-

tion provided. You are required to consult the local building and plumbing

codes prior to installation. If this information is not consistent with local

building or plumbing codes, the local codes should be followed.

Need for Periodic Inspection/Maintenance: This product must be test-

ed periodically in compliance with local codes, but at least once per year or

more as service conditions warrant. Corrosive water conditions, and/or un-

authorized adjustments or repair could render the product ineffective for the

service intended. Regular checking and cleaning of the product’s internal

components helps assure maximum life and proper product function.

WARNING