Resideo AT140A1042 Transformer
The Resideo AT140A1042 Transformer is a heavy-duty 40VA power supply engineered for reliable performance in HVAC control circuits and zoning systems. This foot-mounted transformer features a dual-voltage primary (120V/240V) at 60Hz, providing a steady 24VAC output for powering thermostats, relays, and gas valves. The multi-tap connection design simplifies installation across various line voltage configurations, ensuring the secondary output remains stable under load. Built with internal thermal protection, this step-down transformer manages inductive loads effectively, making it a standard replacement for residential and light commercial equipment. The color-coded lead wires streamline wiring, reducing field errors when integrating this Class 2 power source into complex control panels.
- Universal Compatibility: Works as a drop-in replacement for most 40VA systems requiring a 120/240V primary.
- Rugged Foot Mounting: Secure installation for furnace cabinets or electrical boxes.
- Reliable Lead Insulation: Rated for high-temperature environments typical of HVAC equipment.
- Internal Fuse Protection: Shields the 24V secondary winding from external shorts or overloads.
Common Technical Questions
Can the AT140A1042 handle multiple zone valves?
This unit provides 40VA of power; calculate the total draw of your zone valves to ensure the aggregate load does not exceed 1.6 amps at 24VAC.
Will this work with smart thermostats?
Yes, it provides the necessary constant 24V C-wire power required for most modern Wi-Fi and smart HVAC controllers.
Is this rated for 50Hz applications?
No, this specific model is optimized for 60Hz North American power grids to maintain proper secondary voltage output.
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.
Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
The Resideo AT140A1042 Transformer is a heavy-duty 40VA power supply engineered for reliable performance in HVAC control circuits and zoning systems. This foot-mounted transformer features a dual-voltage primary (120V/240V) at 60Hz, providing a steady 24VAC output for powering thermostats, relays, and gas valves. The multi-tap connection design simplifies installation across various line voltage configurations, ensuring the secondary output remains stable under load. Built with internal thermal protection, this step-down transformer manages inductive loads effectively, making it a standard replacement for residential and light commercial equipment. The color-coded lead wires streamline wiring, reducing field errors when integrating this Class 2 power source into complex control panels.
- Universal Compatibility: Works as a drop-in replacement for most 40VA systems requiring a 120/240V primary.
- Rugged Foot Mounting: Secure installation for furnace cabinets or electrical boxes.
- Reliable Lead Insulation: Rated for high-temperature environments typical of HVAC equipment.
- Internal Fuse Protection: Shields the 24V secondary winding from external shorts or overloads.
Common Technical Questions
Can the AT140A1042 handle multiple zone valves?
This unit provides 40VA of power; calculate the total draw of your zone valves to ensure the aggregate load does not exceed 1.6 amps at 24VAC.
Will this work with smart thermostats?
Yes, it provides the necessary constant 24V C-wire power required for most modern Wi-Fi and smart HVAC controllers.
Is this rated for 50Hz applications?
No, this specific model is optimized for 60Hz North American power grids to maintain proper secondary voltage output.
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.
