WATTS LFUSG-B Under Sink Guardian Thermostatic Mixing Valve Instruction Manual

: June 9, 2024
: WATTS

Table of Contents

Description
Applications
Sensor Faucet
Installation
Quick-Connect Installation
Basic Construction
Limited Warranty
References
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WATTS LFUSG-B Under Sink Guardian Thermostatic Mixing Valve Instruction Manual

WARNING

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Read this Manual BEFORE using this equipment. Failure to read and follow all safety and use information can result in death, serious personal injury, property damage, or damage to the equipment. Keep this Manual for future reference.

WARNING

FAILURE TO COMPLY WITH PROPER INSTALLATION AND MAINTENANCE INSTRUCTIONS COULD CONTRIBUTE TO THE VALVE FAILURE, RESULTING IN INJURY AND/OR DEATH.

TO ENSURE THE ACCURATE AND RELIABLE OPERATION OF THIS PRODUCT, IT IS ESSENTIAL TO:

Properly design the system to minimize pressure and temperature variations.
This valve is factory preset. However, it can be adjusted to deliver scalding temperatures. Check outlet temperature to ensure it does not exceed 105°F (41°C). Make sure temperature limit stop is properly re-set to maximum 105°F (41°C) following valve maintenance or repair. Tampering with limit stop in any way may result in scalding temperature causing serious bodily harm and/or death.

WARNING

Need for Periodic Inspection and Yearly Maintenance: Periodic inspection and yearly maintenance by a licensed contractor is required. Corrosive water conditions, and/or unauthorized adjustments or repair could render the valve ineffective for service intended. Regular checking and cleaning of the valve’s internal components and check stops helps assure maximum life and proper product function. Frequency of cleaning and inspection depends upon local water conditions.

WARNING

You are required to consult the local building and plumbing codes prior to installation. If the information in this manual is not consistent with local building or plumbing codes, the local codes should be followed. Inquire with governing authorities for additional local requirements.

Description

The Watts 3⁄8″ compression fitting and quick-connect mixing thermostatic valve maintains and limits hot water to desired selectable temperature between 80°F to 120°F (27°C to 49°C) and with flow rate as low as 0.25 gpm (1.0 lpm) and as high as 2.25 gpm (8.5 lpm). The mixing valve is listed to ASSE 1070 standard and IAPMO cUPC. The superior flow characteristic of LFUSG-B series provides temperature control with low pressure drop. The LFUSG-B incorporate dual check valves to protect against cross-flow and integral screens to filter out debris. A cap is included for three port applications.

Applications

The LFUSG-B are intended for under sink installations to control the hot water temperature and minimize the occurrence of accidental scalding. The water temperature must be adjusted by the installer using a thermometer to measure the hot water temperature at the faucet outlet. Maximum temperature of 105°F (41°C) is recommended.

Sensor Faucet

Installation

NOTICE

Flush all piping thoroughly before installation.

Locate suitable place for the thermostatic mixing valve. Valve should be accessible for service and adjustment and as close to the point-of-use as possible.
Connect hot and cold water to the supply valve using 3⁄8″ compression connections. Make sure copper tubing does not extend more than 3⁄16″ beyond the compression ferrule. For quick-connect refer to quick-connect installation.
Connect outlets of thermostatic mixing valve to fixture inlets.
Turn hot and cold water supplies on. If any leaks are observed, tighten connections as necessary before proceeding.
Turn on fixture and allow water to flow for 2 minutes. Measure temperature at the outlet.

Two Handle Faucet

ASSE 1070, cUPC and NSF Listed

ASSE 1070
Symbol

Certified NSF/ANSI/CAN 61-9 & 372

Temperature Adjustment

Loosen locknut
Turn on fixture and run water at least for 2 minutes to allow water temperature to stabilize.
Turn temperature adjustment screw counterclockwise for hotter or clockwise for colder outlet temperature.
Tighten locknut to prevent accidental or unauthorized temperature adjustment.
Re-check outlet temperature.

Quick-Connect Installation

To Connect:

Mark pipe as shown. This is pipe insertion depth.
Clean pipe end.
If using PEX tubing, insert pipe stiffener (provided) into end of pipe.
Push tubing into tailpiece up to mark.
Insert collet clip.

To Disconnect:

Remove collet clip.
Depress collet.
Pull tubing from tailpiece.

Basic Construction

Limited Warranty

Watts Regulator Co. (the “Company”) warrants each product to be free from defects Limited Warranty: – in material and workmanship under normal usage for a period of one year from the date of original ship ment. In the event of such defects within the warranty period, the Company will, at its option, replace or recondition the product without charge.
THE WARRANTY SET FORTH HEREIN IS GIVEN EXPRESSLY AND IS THE ONLY WARRANTY GIVEN BY THE COMPANY WITH RESPECT TO THE PRODUCT. THE COMPANY MAKES NO OTHER WARRANTIES, EXPRESS OR IMPLIED. THE COMPANY HEREBY SPECIFICALLY DISCLAIMS ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
The remedy described in the first paragraph of this warranty shall constitute the sole and exclusive remedy for breach of warranty, and the Company shall not be responsible for any incidental, special or consequential damages, including without limitation, lost profits or the cost of repairing or replacing other property which is damaged if this product does not work properly, other costs resulting from labor charges, delays, vandalism, negligence, fouling caused by foreign material, damage from adverse water conditions, chemical, or any other circumstances over which the Company has no control. This warranty shall be invalidated by any abuse, misuse, misapplication, improper installation or improper maintenance or alteration of the product.
Some States do not allow limitations on how long an implied warranty lasts, and some States do not allow the exclusion or limitation of incidental or consequential damages. Therefore the above limitations may not apply to you. This Limited Warranty gives you specific legal rights, and you may have other rights SO that vary from State to State. You should consult applicable state laws to determine your rights.
FAR AS IS CONSISTENT WITH APPLICABLE STATE LAW, ANY IMPLIED WARRANTIES THAT MAY NOT BE DISCLAIMED, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE LIMITED IN DURATION TO ONE YEAR FROM THE DATE OF ORIGINAL SHIPMENT.

USA:
T: 978-689-6066
Watts.com
Canada:
T: 888-208-8927
Watts.ca
Latin America:
T: (52) 55-4122-0138
Watts.com