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Series USG-P
Under Sink Guardian®
Series USG-P Under Sink Guardian® 3/8" (10mm) compression
fitting thermostatic mixing valves maintain and limit hot water
to desired selectable temperature between 80°F and 120°F
(27°C and 49°C) 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 Standard 1016 for single fixture applications and is
NSF 61 Certified. The USG-P 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
provide accurate temperature control (±3°F) with low pressure
drop. As an added feature, the USG-P incorporates dual
check valves to protect against cross-flow.
Features
- Maintains mixed water temperature to ±3°F up to120°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.
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
thermometer 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 water
supply to the fixture. The valve shall be ASSE Standard 1016
listed and NSF 61 Certified and control the temperature of the
hot water. It shall have a thermoplastic body and shall include
integral check valves and an adjustment cap with locking feature.
The valve shall be provided with 3/8" (10mm) male compression
fittings. The valve shall be Watts Regulator Company
Series USG-P.
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USG-P
ASSE 1016 Listed
U.S. Pat. 6,315,209
Application Note
Delivery of water to fixtures intended for use in bathing or
washing should always be controlled by valves listed to
ASSE Standard 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.
The installer should always test to verify temperature setting
after installation.
Materials
Body: Thermoplastic
Metal Disc: Stainless steel
Spring: Stainless steel
Ball: Stainless steel
Thermostat: Copper
Rubber Disc: Buna-N
O-rings: Buna-N
Piston: UDEL-P1700
Gasket: Garlock 3000
Approval: CSA B-125 and NSF 61 Certified
Listing: ASSE 1016
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Pressure – Temperature
Minimum supply pressure: 30psi (207 kPa)
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)
Temperature out: 80°F-120°F (27°C-49°C)
Maximum pressure: 150psi (10.34 bar)
Pressure differential between hot and cold inlet supplies must be less than 20% between them.
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Flow Capacity 3/8" USG-P
Basic Construction
Dimensions – Weights
Typical Installations
One or Two Handle Faucet
Sensor Faucet
The Watts Under Sink Guardian®, USG installs easily onto most faucets.
- Shut off supply valves and remove existing piping to faucet.
- Connect the USG to the supply valves and the faucet, using tubing of your choice with 3/8" (10mm) compression fittings.
- Turn on supply valves and check for leaks.
- Set temperature.
You can easily adjust the Under Sink Guardian® to the desired safe maximum temperature using the unique safety cap.
- Loosen the cap screw with the hex wrench provided.
- Pull the cap from the valve body and turn to obtain the desired mixed temperature at the outlet. As a safety feature, the cap must be partially lifted from the valve to adjust the temperature.
- Push the cap onto the valve body and tighten the hex screw to protect against inadvertent or unauthorized adjustment of the outlet temperature.
- Lower handlle and tighten screw.
- Check outlet temperature.
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