Watts 0559127 Valve

For high-demand commercial and institutional hot water systems, the Watts 0559127 (Model LFN170-M3) is a heavy-duty 1 1/2" Lead Free master mixing valve designed for installation at the hot water source. Engineered with a robust lead free brass body and a rapid-response paraffin-based thermostat, this valve precisely mixes hot and cold water to provide a stable outlet temperature between 90°F and 180°F. It effectively extends the capacity of your hot water supply while protecting downstream piping from extreme temperatures. With a high flow capacity of 105 GPM at 45 PSI and a CV rating of 15.65, it is built to handle the rigorous volume requirements of large-scale facilities. The single-seat design ensures a virtual shutoff of the tempered water if the cold water supply fails, preventing high-temperature spikes in the distribution system.

Key Benefits for the Contractor:

• Precise Temperature Control: Utilizes a copper/paraffin thermostat assembly for accurate temperature sensing and adjustment.
• Advanced Durability: Features polysulfone internals that are highly resistant to corrosion, heat, and lime scale buildup for long-term reliability.
• Secure Settings: Includes a vandal-resistant locking mechanism and a temperature adjustment screw to prevent unauthorized tampering with the thermal set point.
• Simplified Maintenance: The rough-in dimensions are compatible with previous N170 models, making this an ideal replacement master mixing valve for service calls.
• Compliance Ready: ASSE 1017 and IAPMO cUPC listed to meet strict commercial plumbing codes.

Common Questions About the Watts LFN170-M3:

Can this valve be used as a point-of-use anti-scald device?
No. This is a master tempering valve designed for point-of-source installation at the boiler or water heater. For fixture-level protection (showers, sinks), you must use ASSE 1016, 1069, or 1070 listed devices.

What is the minimum flow rate required for proper operation?
The 1 1/2" LFN170-M3 requires a minimum flow of 5 GPM to maintain its specified temperature accuracy.

Difference between the M2 and M3 models?
The LFN170-M3 features improved temperature control and a wider range (90-180°F) compared to older iterations, with internal components designed for easier field adjustment and better resistance to mineral deposits.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.