Reznor 41700 Duct Stat

The Reznor 41700 Duct Stat is a specialized replacement HVAC control designed for precise temperature regulation in commercial duct furnaces and unit heaters. This mechanical duct thermostat, traditionally cross-referenced as the Honeywell T678A1054 or T678A1015, utilizes a remote liquid-filled sensing bulb to monitor discharge air temperatures. For technicians servicing Reznor XE, X, or RPV series units, this two-stage controller is essential for managing dampers, valves, or staged heating cycles. The T678A duct stat features two SPDT switches that operate in sequence, providing a reliable 2-stage temperature control solution. With an adjustable range typically between 55°F and 125°F, it ensures the system maintains set parameters by activating equipment based on temperature rise. The heavy-duty copper capillary allows for flexible remote mounting, making it ideal for industrial furnace repair where direct access to the air stream is required. Its robust construction ensures long-term stability in high-demand environments, preventing frequent recalibration needs.

• Dual-Stage Control: Features two SPDT switches for sequential operation, allowing for precise management of multiple heating or cooling stages.
• Remote Sensing Capability: Uses a 20-foot copper capillary with a dedicated sensing bulb for accurate readings away from the controller body.
• System Compatibility: Explicitly engineered for Reznor series furnaces and packaged units, serving as a direct replacement for discontinued T678 series stats.
• Adjustable Temperature Range: Supports settings from 55°F to 125°F, accommodating a wide variety of industrial climate control requirements.
• Durable Construction: Built with ambient-compensated mechanical components to withstand the rigorous conditions of commercial ductwork.

Common Questions

Can this duct stat be used for both heating and cooling?
Yes, the Reznor 41700 utilizes SPDT switching, which allows it to be wired to break or make a circuit on temperature rise, supporting both heat and cool applications.

What is the typical differential for the T678A model?
These units generally feature a fixed interstage differential, which ensures a consistent temperature gap between the first and second stage activations for system stability.

Does this part include the mounting bracket?
Standard models typically include a capillary holder or bulb clip for duct mounting, though specific hardware should be verified based on your existing installation requirements.

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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.