Introduction
The SUPCO AT012 is an adjustable replacement thermostat designed for use in various heating equipment and dryers. This thermostat provides flexible temperature control, allowing adjustments up to 40°F between its low and high settings by rotating the pointer on the dial. It is engineered to offer reliable temperature regulation for compatible systems.
Safety Information
- Electrical Hazard: Always disconnect power to the appliance before installing, servicing, or removing the thermostat. Failure to do so can result in serious injury or death.
- Qualified Personnel: Installation and servicing should only be performed by qualified personnel familiar with appliance repair and electrical systems.
- Voltage: This thermostat operates on 24 Volts (AC). Ensure the appliance's voltage matches this requirement.
- Proper Tools: Use appropriate insulated tools during installation to prevent electrical shock.
- Ventilation: Ensure adequate ventilation when working on heating equipment.
Package Contents
Verify that all components are present before beginning installation.
- 1 x SUPCO AT012 Adjustable Replacement Thermostat
Installation Instructions
Follow these steps carefully for proper installation of the AT012 thermostat.
- Disconnect Power: Locate the circuit breaker or fuse box controlling the appliance (dryer, heating equipment) and turn off the power supply completely. Verify power is off using a voltage tester.
- Access Thermostat: Depending on your appliance, you may need to remove panels or covers to access the existing thermostat. Refer to your appliance's service manual for specific access procedures.
- Identify Wiring: Carefully note or photograph the wiring connections to the old thermostat. The AT012 thermostat has two terminals for electrical connections.
- Remove Old Thermostat: Disconnect the wires from the old thermostat and unmount it from its position.
- Mount New Thermostat: Position the SUPCO AT012 thermostat in the same location as the old one. Secure it using the existing mounting holes. The thermostat features a round body with a metal mounting plate.
- Connect Wiring: Connect the wires to the terminals on the new AT012 thermostat, ensuring they are securely fastened. This thermostat is designed for 24V AC systems.
- Secure Panels: Replace any panels or covers that were removed to access the thermostat.
- Restore Power: Turn the power supply back on at the circuit breaker or fuse box.
- Test Operation: Test the appliance to ensure the new thermostat is functioning correctly and regulating temperature as expected.

Image: The SUPCO AT012 Adjustable Replacement Thermostat, showing its black body, adjustable dial with temperature markings (e.g., 135, 145, 165), and metal mounting plate with two screw holes.
Operation
The AT012 thermostat features an adjustable pointer on its dial for setting the desired temperature. This allows for a temperature range adjustment of up to 40°F between the low and high settings.
- Adjusting Temperature: To adjust the temperature, gently rotate the pointer on the dial to the desired temperature setting. The dial is marked with temperature values (e.g., 135, 145, 165, 175).
- Temperature Range: The thermostat provides a specific operating temperature range. Ensure your desired temperature falls within this range.
- Monitoring: After adjustment, monitor the appliance's performance to ensure it maintains the set temperature effectively.
Maintenance
The SUPCO AT012 thermostat is designed for minimal maintenance. However, periodic checks can help ensure its longevity and proper function.
- Visual Inspection: Periodically inspect the thermostat and its wiring for any signs of damage, corrosion, or loose connections. Ensure power is disconnected before inspection.
- Cleaning: If dust or debris accumulates on the thermostat, gently wipe it clean with a dry, soft cloth. Do not use liquid cleaners.
- Professional Check: If you suspect a malfunction or notice inconsistent temperature regulation, consult a qualified technician.
Troubleshooting
If you encounter issues with your AT012 thermostat, consider the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Appliance not heating/cooling | No power to appliance; Incorrect wiring; Faulty thermostat. | Check circuit breaker/fuse. Verify wiring connections. If power and wiring are correct, the thermostat may need replacement. |
| Inconsistent temperature regulation | Thermostat setting incorrect; Thermostat sensor obstructed; Thermostat faulty. | Ensure the pointer is set to the desired temperature. Check for obstructions around the thermostat. If issues persist, consider professional diagnosis. |
| Thermostat dial is stiff or stuck | Accumulated debris; Internal mechanism issue. | Gently clean the dial area. Do not force the dial. If it remains stiff, the thermostat may be damaged and require replacement. |
Note: For complex issues or if you are unsure about any step, it is highly recommended to consult a qualified appliance technician.
Specifications
| Brand | Supco |
| Model Name | AT012 |
| Controller Type | Mechanical knob |
| Special Feature | Adjustable |
| Color | Black |
| Specific Uses For Product | Home Heating and Cooling Systems |
| Temperature Control Type | Manual |
| Connectivity Technology | Wired |
| Power Source | Hardwire |
| Voltage | 24 Volts (AC) |
| Material | Plastic |
| Item Weight | 1.12 ounces |
| Product Dimensions | 1 x 1 x 1 inches |
| Manufacturer | SUPCO |
| UPC | 687152010141 |
Warranty and Support
For warranty information or technical support regarding your SUPCO AT012 Adjustable Replacement Thermostat, please refer to the official Supco website or contact their customer service directly. Keep your purchase receipt as proof of purchase.
For further assistance, you may also contact the retailer from whom the product was purchased.