Johnson Controls T46SAA-1 Thermostat

The Johnson Controls T46SAA-1 is a robust line voltage fan coil thermostat engineered for precise heating and cooling applications in commercial and residential HVAC systems. Designed with heavy-duty construction, this manual changeover thermostat features a Heat-Off-Cool system switch and an integrated Lo-Med-High fan switch for direct control of multi-speed fan motors. The unit operates within a 40 to 90 degree Fahrenheit setpoint range, providing reliable temperature regulation for 2-pipe or 4-pipe fan coil units. As a veteran-grade replacement part, the T46SAA-1 serves as the direct replacement for T46SAH-1, offering the added functionality of a multi-speed fan selector that the previous model lacked. The almond finish and gold faceplate house a high-accuracy sensing element with a 50 to 90 degree thermometer range, ensuring compatibility with standard electrical boxes and simplified wiring for field technicians.

• Broad Compatibility: Optimally designed for 120, 208, or 240 VAC line voltage fan coil systems.
• Enhanced Control: Features an integrated three-speed fan selector for improved airflow management and occupant comfort.
• Mechanical Reliability: Utilizes a proven vapor-tension sensing element for consistent performance in demanding environments.
• Direct Retrofit: Seamlessly replaces the T46SAH-1 model, simplifying hardware upgrades without requiring major mounting modifications.

Common Technical Questions

How do I wire the T46SAA-1 for 2-pipe vs 4-pipe systems?
The wiring configuration depends on the system's valve arrangement. For 2-pipe systems, the thermostat controls a single valve for both heating and cooling, while 4-pipe configurations require specific lead connections to manage independent hot and chilled water valves through the Heat-Off-Cool switch.

Can this thermostat replace a low-voltage 24V model?
No, the T46SAA-1 is a line voltage controller designed for high-voltage applications. Connecting this to a 24V control circuit will damage the system. Always verify the voltage source at the junction box before installation.

What are the electrical ratings for the fan and system switches?
The switches are typically rated for 6.0 AFL and 36.0 ALR at 120 VAC, ensuring they can handle the inductive loads of fan motors and solenoid valves commonly found in fan coil units.

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.