1.5 LF909M1-QT-S-FS

Item Number: F122766
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$5,956.21
Special Order
When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Watts
  • Size: 1 1/2 inch
  • Weight: 42.5 lb
  • Connection Type: Male NPT Threaded
  • Body Material: Lead Free* Cast Copper Silicon Alloy
  • Maximum Working Pressure: 175 psi
  • Continuous Temperature Range: 33°F - 140°F
  • Features Integrated Flood Sensor with SentryPlus Alert® Technology
  • Modular, compact design for easier installation
  • Approved by ASSE 1013 and NSF International

Description

The Watts 1 1/2 inch LF909M1 Lead Free Reduced Pressure Zone Backflow Preventer Assembly provides superior protection against cross-connection contamination in potable water supplies. Featuring lead-free cast copper silicon alloy construction and 1 1/2 inch Male NPT threaded connections, this assembly is designed for health hazard containment. Its unique air-in/water-out relief valve ensures maximum discharge during emergencies, while an integrated flood sensor with SentryPlus Alert® technology detects excessive water release. This compact unit can be installed horizontally or vertically and includes quarter-turn shutoff valves and a bronze strainer. Item number F122766.

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Connections

  • The 1 1/2 inch LF909M1 backflow preventer assembly features 1 1/2 inch Male NPT threaded body connections.
  • This assembly is designed for installation in continuous pressure piping applications to prevent backsiphonage and backpressure.
  • It can be installed in either a horizontal or vertical orientation.

Flood Sensor Connectivity

The integrated flood sensor requires an add-on connection kit to activate its alert features. Available connection kit options include compatibility with Building Management Systems (BMS), cellular communication, or the Sensor Control Monitor for integration with BAS via RS-485 Modbus or the Nexa® platform through Wi-Fi.

Installation of a drain line with an air gap is recommended for proper discharge management.

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Additional Details

The 1 1/2 inch Watts LF909M1 Reduced Pressure Zone backflow preventer assembly protects potable water supplies from hazardous cross-connections by preventing backsiphonage and backpressure.

This assembly features a patented air-in/water-out relief valve design for high capacity discharge during emergency conditions and includes a flood sensor with SentryPlus Alert® technology to detect continuous relief valve discharge.

Features

  • Lead Free* construction complies with installation requirements
  • Unique patented air-in/water-out principle provides maximum relief valve discharge
  • Modular, compact design eases installation
  • Replaceable seats allow for easy maintenance
  • Can be installed horizontal or vertical without special tools
  • Quarter-turn ball valve shutoffs with lever handles for easy operation
  • Integrated flood sensor with SentryPlus Alert® technology detects excessive water discharges
  • Flood alerts can be activated with an add-on sensor connection kit, compatible with BMS and cellular communication for remote monitoring
  • Includes an upstream bronze strainer to protect internal components
  • Top mounted test cocks

An add-on connection kit is required to activate the flood sensor. Without the connection kit, the flood sensor is a passive component and will not communicate with other devices. The flood sensor does not replace the need for proper drainage or compliance with installation codes and regulations. Watts is not responsible for alert failures due to connectivity or power issues.

Specifications

  • Product Series: LF909M1
  • Nominal Size: 1 1/2 inch
  • Connection Type: Male NPT Threaded Body
  • Body Material: Lead Free* cast copper silicon alloy
  • Shutoff Valves: Lead Free* cast copper silicon alloy, Quarter-turn ball valves with lever handles
  • Strainer Material: Bronze
  • Check Seat Material: 909 Celcon®
  • Relief Valve Seat Material: Stainless Steel 909
  • Test Cock Material: Lead Free* cast copper silicon alloy
  • Maximum Working Pressure: 175 psi (12.1 bar)
  • Temperature Range: 33°F - 140°F (0.5°C - 60°C) continuous; 180°F (82°C) intermittent
  • Flood Sensor: Yes, with SentryPlus Alert® technology
  • Weight (QT-S model): 44.0 lb (20.0 kg)

Certificates & Approvals

  • ASSE 1013
  • AWWA C-511-92
  • CSA B64.4
  • FCCCHR of USC Manual Section 10
  • IAPMO (UPC) Listed
  • SBCCI (Standard Plumbing code) Listed
  • Tested and Certified by NSF International (NSF/ANSI 61-G&372)
  • Approved by the Foundation for Cross-Connection Control and Hydraulic Research at the University of Southern California

FAQs

What type of protection does the Watts LF909M1 backflow preventer provide?

This assembly provides superior cross-connection control protection for potable water supplies against both backsiphonage and backpressure, suitable for health hazard cross-connections.

What are the main components of this backflow preventer?

The assembly consists of a lead-free cast copper silicon alloy body, quarter-turn ball valve shutoffs with lever handles, a bronze strainer, check modules, replaceable seats, top-mounted test cocks, and a pressure differential relief valve.

What is the maximum operating pressure and temperature range for this unit?

The maximum working pressure is 175 psi (12.1 bar). It operates in a continuous temperature range of 33°F to 140°F (0.5°C to 60°C) and intermittently up to 180°F (82°C).

How does the integrated flood sensor work?

The flood sensor detects excessive water discharges from the relief valve using SentryPlus Alert® technology. To activate alert features and notifications, an add-on connection kit (compatible with BMS, cellular, or Wi-Fi) is required.

Can this 1 1/2 inch LF909M1 assembly be installed vertically?

Yes, this specific 1 1/2 inch assembly can be installed in either a horizontal or vertical orientation without the need for special tools.

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