Williams P322016 Thermostat

The Williams P322016 Thermostat is a technician-grade millivolt heating control specifically engineered for compatibility with Williams furnace systems, including gravity wall heaters and floor furnaces. This non-programmable mechanical thermostat operates on a 750mv system, eliminating the need for external power or common wires, making it a critical component for remote or off-grid installations where electrical reliability is paramount. With a temperature setpoint range of 50°F to 90°F, it provides responsive bimetal sensing to ensure stable cycles and precise temperature regulation. The rugged housing supports either unit-mounted configurations or standard wall-mounted installs, providing the flexibility needed when retrofitting older HVAC heating systems. For contractors, the P322016 represents a simplified failure point, utilizing a bimetal sensor and low-voltage mercury-free switching to manage high-efficiency heat output without the complexity of modern digital logic.

Technical Benefits for Professionals

• System Compatibility: Explicitly designed as a millivolt thermostat for Williams heaters, ensuring proper impedance matching for the 750mv thermopile.
• Direct Replacements: Seamlessly replaces older P322014 and P322016 models without requiring terminal modifications or new wiring runs.
• Self-Powered Operation: Ideal for gravity furnaces and wall units, maintaining operation during power outages by drawing power directly from the pilot light assembly.
• Durable Construction: Built to withstand the high-cycle environments of residential and commercial heating applications without drift in calibration.

Common Installation Questions

Does this thermostat require batteries or a 24V transformer?
No, this is a self-powered millivolt thermostat. It operates exclusively on the millivoltage generated by the furnace thermopile, making it independent of house power.

Can I use the P322016 with a standard 24V forced-air system?
This model is specifically intended for millivolt heating systems. High-voltage or standard 24V AC systems will damage the switching mechanism; verify your system voltage before installation.

Is this unit mercury-free?
Yes, this Williams temperature controller uses modern mechanical switching that complies with all environmental regulations regarding heavy metals.

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.