Johnson Controls Inc
Johnson Controls Inc T46SAA-1C thermostat 40-90°F 24-277V AC Brown
Mechanical line-voltage thermostat controlling heating and cooling from 40 to 90 °F on 24–277 V AC with SPDT switching
- TypeLearning Thermostats
- ColorBrown
- Mechanical line-voltage control handles 24 to 277 V AC
- SPDT switch action opens or closes on temperature rise
- 40 to 90 °F range suits heating and cooling systems
- NEMA 1 enclosure protects internal components in indoor settings
- 15 A resistive and 3 A inductive ratings support typical HVAC loads
Line-voltage mechanical thermostat
The Johnson Controls T46SAA-1C is a line-voltage mechanical thermostat rated for 24 to 277V AC. It uses a bi-metal sensor to control heating and cooling systems with a single stage. The unit fits a standard NEMA 1 enclosure and comes in a brown finish.
Sustained load behaviour
The SPDT switch action opens on temperature rise and closes on fall with a fixed 7°F differential. Two switches handle 15 A resistive, 36 A locked-rotor, 18 A full-load and 3 A pilot-duty ratings across the full 40 to 90°F range. Performance remains consistent without electronic drift.
Thermals noise and power
Mechanical operation produces no fan noise and draws no standby power beyond the circuit it controls. The bi-metal element reacts directly to ambient temperature inside the NEMA 1 enclosure. No external transformer or control voltage is required for the switching function.
Highlights
- Mechanical line-voltage control handles 24 to 277 V AC
- SPDT switch action opens or closes on temperature rise
- 40 to 90 °F range suits heating and cooling systems
- NEMA 1 enclosure protects internal components in indoor settings
- 15 A resistive and 3 A inductive ratings support typical HVAC loads
Specifications
| Brand | Johnson Controls |
|---|---|
| Model | T46SAA-1C |
| Type | Learning Thermostats |
| Color | Brown |
Questions about this item
Does the 15 A rating mean the T46SAA-1C generates noticeable heat when running all day?
The thermostat is a mechanical bi-metal switch rated for up to 15 A at 24–277 V AC; it does not contain active electronics, so heat output is negligible during normal operation.
What wiring must already be in place for the T46SAA-1C to control heating and cooling?
You need a line-voltage supply (24–277 V AC) and conductors for the two SPDT switch circuits plus the Hi-Med-Low fan and Heat-Cool-Off system switching terminals.
Will the T46SAA-1C replace an older two-stage mechanical thermostat without rewiring?
This model provides only a single stage of control, so it cannot directly replace a two-stage stat without changes to the wiring and control logic.
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