8/8/2019 Series LFUSG-B Specification Sheet

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Job Name ______________________________________ Contractor ______________________________________

Job Location ____________________________________ Approval ________________________________________

Engineer ________________________________________ Contractor’s P.O. No. ____________________________

 Approval________________________________________ Representative __________________________________

 For Residential and Commercial Applications

Series LFUSG-BUnder Sink Guardian®

Series LFUSG-B Under Sink Guardian® 3 ⁄ 8" (10mm) compressionfitting thermostatic mixing valves maintain and limit hot water todesired selectable temperature between 80°F and 120°F (27°Cand 49°C) with flow rates as low as 0.5 gpm (1.9 lpm) and ashigh as 2.5 gpm (9.5 lpm). The mixing valve is listed to ASSEStandard 1070 for single fixture applications. The LFUSG-B seriesuses a double throttling design to control both the hot and coldwater supply to the mixed outlet.The LFUSG-B features LeadFree* construction to comply with Lead Free* installation require-ments. The superior flow characteristics of this valve provideaccurate temperature control (±3°F) with low pressure drop.

 As an added feature, the LFUSG-B -M1 incorporates dual check valves to protect against cross-flow and integral screensto filter out debris.

Features• Lead Free* Brass body construction.

• Maintains mixed water temperature to ±3°F up to 120°F (49°C).

• Installs easily between the stop valves and faucet

• Includes tamper resistant locking cap to prevent accidental

mis-adjustment.• Built-in check valves prevent migration of hot water to cold and

cold water to hot water piping.

• Provided with cap for three port application.

• Integral strainer with 40 mesh stainless steel screens to filterout debris.

 Applications The unit is intended for under sink installation to control the hotwater temperature and prevent accidental scalding. The watertemperature must be adjusted by the installer using a thermom-eter to measure the hot water temperature at the faucet outlet.Maximum temperature of 110°F (43°C) is recommended.

Specifications

 A Thermostatic Mixing Valve shall be installed on the hot watersupply to the fixture. The valve shall be ASSE Standards 1070listed and control the temperature of the hot water. It shall have aLead Free* brass body. Body shall be constructed using LeadFree* Brass. Lead Free* under counter thermostatic valves shallcomply with state codes and standards, where applicable,requiring reduced lead content. The valve shall include integralcheck valves, integral screens and an ad justment cap withlockin feature. The valve shall be provided with 3 ⁄ 8" (10mm) malecompression fittings. The valve shall be Watts Series LFUSG-B.

For satin chrome finish specify – SC.

 ASSE 1070 ListedU.S. Pat. 6,315,209

 Application NoteDelivery of water to fixtures intended for use in bathing or wash-ing should always be controlled by valves listed to ASSE Stan-dard 1016 or ASSE Standard 1070 such as Watts Series LFUSGor LFMMV mixing valves.

 These valves provide the user with both scald protection andprotection from thermal shock.

 The installer should always test to verify temperature settingafter installation.

MaterialsBody: Lead Free*Brass Rubber Disc: Buna-N

Metal Disc: Stainless steel O-rings: Buna-N

Spring: Stainless steel Piston: UDEL-P1700

Ball: Stainless steel

 Thermostat: Copper

 Approval

ES-LFUSG-B

LFUSG-B-M1

 ASSE 1070 CSA B-125

*The wetted surface of this product contacted by consumable watercontains less than one quarter of one percent (0.25%)of lead by weight.

LEAD FREE*

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.

8/8/2019 Series LFUSG-B Specification Sheet

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Basic Construction

Typical Installations

A B Weight  

Models Size in. mm in. mm lbs. kgs.

LFUSG-B-M1 3 ⁄ 8" Comp. 35 ⁄ 64 78 53 ⁄ 16 132 1.0 .45

LFUSG-B-SC*-M1 3 ⁄ 8" Comp. 35 ⁄ 64 78 53 ⁄ 16 132 1.0 .45

*SC–SatinChromeFinish 

Dimensions – Weights

Pressure – Temperature

Minimum supply pressure: 30psi (207 kPa)

Hot inlet temperature: 120°F-180°F (49°C-82°C)

Cold inlet temperature: 39°F-80°F (3.8°C-27°C)

Minimum inlet temperature differential: 15°F (9°C)

Temperature out: 80°F-120°F (27°C-49°C)

Maximum pressure: 150psi (10.3 bar)

Maximum Pressure differential between

hot and cold inlet supplies: 25%.

kPa psi

620 90

551 80

482 70

413 60

345 50

276 40

207 30

138 2069 10

0 0

Flow Capacity 3 ⁄ 8" LFUSG-B-M1

0 1.00 2.00 3.00 4.00 gpm0 3.8 7.8 11.4 15.2 lpm

LFUSG-B-M1

Two Handle Faucet Sensor Faucet

B

A

Mesh Screen

Check module

Button Head Screw

Locking Adjusting Cap

Ball

O-ring

Stem

Thermostat

Metal Disc

Piston

O-ring

Spring

Body

Check Module

ES-LFUSG-B 1101 © 2011 Watts

USA: No. Andover, MA • Tel. (978) 688-1811 • Fax: (978) 794-1848 • www.watts.com

Canada: Burlington, ONT. • Tel. (905) 332-4090 • Fax: (905) 332-7068 • www.wattscanada.ca

 A Watts Water Technologies Company