Series USG-B Under Sink Guardian
TM
Size:
3
⁄
8
"
(10mm)
Installation Instructions
Description
The Watts
3
⁄
8
" (10mm) compression fitting thermostatic mix ing
valve maintains and limits hot water to desired se lect able 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 mix ing valve is list ed to ASSE Stan dards 1016-96
and 1070 for sin gle fix ture applications. The USG-B se ries uses
a dou ble throt tling de sign to con trol both the hot and cold wa ter
sup ply to the mixed outlet. The superior flow char ac ter is tics of
this valve pro vides accurate tem per a ture con trol (±3°F) with low
pres sure drop. As an add ed fea ture, the USG-B-M1 in cor po-
rates dual check valves to pro tect 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 pro vid ed.
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 set ting in order to have the
hottest inlet tem per a ture flow ing through the valve.
Applications
The unit is intended for under sink installation to con trol the hot
water temperature and prevent ac ci den tal scalding. The water
temperature must be ad just ed by the installer using a thermom-
eter to mea sure the hot water temperature at the faucet outlet.
Maximum tem per a ture of 110°F (43°C) is rec om mend ed.
Application Note
Delivery of water to fixtures intended for use in bath ing 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 mix ing valves.
These valves provide the user with both scald protection and
pro tec tion from thermal shock. These valves should always be
ad just ed after installation to de sired 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
