Watts LFL1170M2-US 1/2 Lead-Free Thermostatic Mixing Valve, Copper, Sweat

The Watts LFL1170M2-US 1/2 is a 1/2" lead-free low-temperature master mixing valve with Sweat connections. It blends hot and cold water to hold a field-adjustable outlet temperature of 60°F to 120°F. It is listed to ASSE 1017. It features a copper body and a epdm seat. Rated to 150 psi. This model is certified lead-free for potable-water installations.

This 1/2 inch lead free hot water control valve is designed for installation on water heating equipment to provide tempered water to point-of-use fixtures and is ideal for radiant heat applications. The double throttling design combines hot and cold water control for a sensitive response to water temperature changes in the mixing chamber. It consists of a lead free brass body, solder union connections, solid wax hydraulic principle thermostat, integral filter washers and check valves, virtual shutoff upon loss of cold water supply, and a locking mechanism for the temperature setting. The maximum pressure is 150 psi (10.3 bar). The adjustable field range temperature is 60 to 120 degrees F (16 to 49 degrees C).

Features

• Lead free brass construction
• Thermal actuation technology for precise temperature control
• Integral filter washers and check valves
• CSA certified B125 and ASSE 1017, IAPMO and UPC listed

Common Questions

Can I use this at a lavatory — is it ASSE 1070 listed?

No. This valve is listed to ASSE 1017 only, which is a point-of-distribution standard: it tempers water leaving the water heater for the building distribution piping. An ASSE 1017 valve should never deliver water directly to a user. For a lavatory you need an ASSE 1070 listed valve, and for a shower an ASSE 1016 device — install one of those downstream of this valve.

What temperature range does it deliver?

The outlet temperature is field-adjustable from 60°F to 120°F. This is the low-temperature version of the series, intended for radiant heat rather than domestic hot water. The hot inlet may be supplied at up to 200°F. It holds that setting down to 0.5 gpm of flow. Set it for the distribution system, not for the fixture — a point-of-use valve downstream sets the final delivered temperature.

Does it have integral checks?

Yes. Check valves are built into the hot and cold inlets to stop cross-flow between the supplies, along with integral filter washers/screens that keep debris off the thermostat. No separate check valves are needed at the valve.

Can I lock the temperature setting?

Yes. A locking mechanism secures the temperature setting once it is dialed in, so it cannot be moved without deliberately unlocking it.

What happens if the cold water supply fails?

The valve shuts down to a virtual drip, so a cold-supply failure cannot send full-temperature hot water downstream.

Specifications

• Type: Mixing/Tempering
• Size: 1/2"
• Connection: Sweat
• Body Material: Copper
• Seat / Seal Material: EPDM
• Max Pressure (psi): 150
• Pack Quantity: 12
• Country of Origin: United States
• Warranty: 1 Year Limited
• MPN: LFL1170M2-US 1/2
• Certifications: ASSE-1017, IAPMO
• Lead-Free: Yes
• ASSE Listing: ASSE 1017
• Install Point: Point of Distribution
• Outlet Temp — Min (°F): 60
• Outlet Temp — Max (°F): 120
• Minimum Controllable Flow (gpm): 0.5
• Integral Checks & Filter Washers: Yes
• Locking Temperature Adjustment: Yes
• Shutoff on Cold-Supply Failure: Yes
• Temperature Gauge Included: No
• Max Hot Inlet Temp (°F): 200
• Union Connections: Yes
• Applications: Radiant Heat;Water Heater;Tankless / Boiler