Watts Under Sink Guardian USG-B Series User manual

Series USG-B Under Sink GuardianTM
Size: 3⁄8"(10mm)
Installation Instructions
Description
The Watts 3⁄8" (10mm) compression fitting thermostatic mixing
valve maintains and limits hot water to desired selectable tem-
perature between 80°F and 120°F (27°C and 49°C) and with
flow rates as low as 0.5 gpm (1.9 lpm) and as high as 2.5 gpm
(9.5 lpm). The mixing valve is listed to ASSE Standards 1016-96
and 1070 for single fixture applications. The USG-B series uses
a double throttling design to control both the hot and cold water
supply to the mixed outlet. The superior flow characteristics of
this valve provides accurate temperature control (±3°F) with low
pressure drop. As an added feature, the USG-B-M1 incorpo-
rates dual check valves to protect against cross-flow and inte-
gral screens to filter out debris. A cap is provided for three port
application.
Temperature Adjustment
1. Loosen the cap screw with the hex wrench provided.
2. As a safety feature the cap must be partially
lifted from the valve to adjust temperature.
3. With the faucet turned on and in the full hot
position, adjust the setting of the valve to
obtain the desired outlet water temperature.
Turn clockwise to decrease temperature.
4. Lower handle and tighten screw.
5. Check outlet temperature.
Note: The hot water should be allowed to flow for two or three
minutes prior to adjusting the valve setting in order to have the
hottest inlet temperature flowing through the valve.
Applications
The unit is intended for under sink installation to control the hot
water temperature and prevent accidental scalding. The water
temperature 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.
Application Note
Delivery 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 USG,
MMV or L111 mixing valves.
These valves provide the user with both scald protection and
protection from thermal shock. These valves should always be
adjusted after installation to desired temperature.
Temperature Adjustment
ASSE 1016-96
and 1070 Listed
U.S. Pat. 6,315,209
IS-USG-B
USG-B-M1
kPa psi
620 90
551 80
482 70
413 60
345 50
276 40
207 30
138 20
69 10
0 0
Flow Capacity 3⁄8"USG-B-M1
0 1.00 2.00 3.00 4.00 gpm
0 3.8 7.8 11.4 15.2 lpm

Pressure - Temperature
Minimum supply pressure: 30psi (207kPa)
Hot inlet temperature: 120°F-180°F (49°C-82°C)
Cold inlet temperature: 40°F-85°F (4°C-29°C)
Minimum inlet temperature differential: 15°F (9°C)
(Hot inlet and mixed outlet)
Temperature out: 80°F-120°F (27°C-49°C)
Maximum pressure: 150psi (10.3 bar)
Pressure differential between hot and cold inlet supplies must
be less than 20% between them.
Approval: CSA B-125
Listing: ASSE 1016-96
ASSE 1070
Basic Construction
Typical Installations
Two Handle Faucet Sensor Faucet
The Watts Series USG-B Under Sink Guardian
installs easily onto most faucets.
• Shut off supply valves and remove existing piping
to faucet.
• Connect the USG-B-M1 to the supply valves and the faucet.
• Turn on the supply valves.
Note: When using copper tubing, tubing should not extend
more than 3⁄16” beyond the compression ferrule.
USG-B-M1
Spout
Sensor
Control
Module
Transformer
Solenoid Valve
Hot Supply
Cap
Watts
USG-B-M1
Cold Supply
Button Head Screw
Locking Adjusting Cap
Ball
O-ring
Stem
Adapter
Thermostat
Metal Disc
Piston
O-ring
Spring
Washer
Body
Check Module
Check Module
Stainless Steel
Mesh Screen
IS-USG-B 0845 EDP# 1915276 © Watts, 2008
USA: 815 Chestnut St., No. Andover, MA 01845-6098; www.watts.com
Canada: 5435 North Service Rd., Burlington, ONT. L7L 5H7; www.wattscanada.ca
Water Safety & Flow Control Products
Limited Warranty: Watts Regulator Co. (the “Company”) warrants each product to be free from defects in material and workmanship under normal usage for a period of one year from the date of
original shipment. 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 that vary from State to State. You should consult applicable state laws to
determine your rights. SO 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.