Resideo AT72D1188 Transformer
The Resideo AT72D1188 Transformer is a heavy-duty, plate-mounted solution designed for consistent step-down power in 24V control circuits. This 40VA HVAC transformer features a 120V primary input and a 24V secondary output, making it a standard choice for technicians servicing thermostats, gas valves, and relays. Engineered for industrial-grade durability, it includes a NEMA Type D rating and a 4"x4" mounting plate designed to secure onto a junction box without protruding internally, preserving critical space for wiring. The primary side utilizes 9-inch color-coded leadwires for rapid identification, while the secondary side provides stable screw terminal connections. This 120V to 24V step-down transformer is built with integrated override protection and meets NEC Class 2 (not wet) and Class 3 (wet) requirements. Whether for residential furnace upgrades or commercial air handling units, this energy-limiting transformer provides the reliable voltage regulation required for modern HVACR control systems.
Key Benefits- Space-Efficient Plate Mounting: The 4"x4" plate ensures a flush fit on standard electrical boxes, preventing obstruction within the housing.
- Enhanced Circuit Safety: Integrated override protection and energy-limiting design meet UL 1585 and NEMA Standard DC20-1992.
- Streamlined Installation: 9-inch color-coded leads simplify primary high-voltage wiring for faster field swaps.
- Broad Compatibility: The 40VA power rating is ideal for multi-stage thermostats, hydronic zone valves, and pilot-duty relays.
- Industrial Resilience: Rated for operation in ambient temperatures ranging from -20°F to +105°F.
What is the difference between NEMA Type D and other mounting styles?
NEMA Type D indicates the transformer is specifically designed for plate mounting on a 4x4 junction box, ensuring the core remains external to the box to maintain air gap and prevent overheating of internal wires.
Can the AT72D1188 handle multiple zone valves?
With a 40VA rating, this unit can typically support several low-draw zone valves or a single heavy-duty actuator. Always calculate the total VA load of your components to ensure it does not exceed 40VA.
How do the leadwires simplify the install?
The 9-inch leads are pre-stripped and color-coded to match standard 120V circuit configurations, reducing the risk of wiring errors during high-voltage primary connections.
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.
Resideo AT72D1188 Transformer
The Resideo AT72D1188 Transformer is a heavy-duty, plate-mounted solution designed for consistent step-down power in 24V control circuits. This 40VA HVAC transformer features a 120V primary input and a 24V secondary output, making it a standard choice for technicians servicing thermostats, gas valves, and relays. Engineered for industrial-grade durability, it includes a NEMA Type D rating and a 4"x4" mounting plate designed to secure onto a junction box without protruding internally, preserving critical space for wiring. The primary side utilizes 9-inch color-coded leadwires for rapid identification, while the secondary side provides stable screw terminal connections. This 120V to 24V step-down transformer is built with integrated override protection and meets NEC Class 2 (not wet) and Class 3 (wet) requirements. Whether for residential furnace upgrades or commercial air handling units, this energy-limiting transformer provides the reliable voltage regulation required for modern HVACR control systems.
Key Benefits- Space-Efficient Plate Mounting: The 4"x4" plate ensures a flush fit on standard electrical boxes, preventing obstruction within the housing.
- Enhanced Circuit Safety: Integrated override protection and energy-limiting design meet UL 1585 and NEMA Standard DC20-1992.
- Streamlined Installation: 9-inch color-coded leads simplify primary high-voltage wiring for faster field swaps.
- Broad Compatibility: The 40VA power rating is ideal for multi-stage thermostats, hydronic zone valves, and pilot-duty relays.
- Industrial Resilience: Rated for operation in ambient temperatures ranging from -20°F to +105°F.
What is the difference between NEMA Type D and other mounting styles?
NEMA Type D indicates the transformer is specifically designed for plate mounting on a 4x4 junction box, ensuring the core remains external to the box to maintain air gap and prevent overheating of internal wires.
Can the AT72D1188 handle multiple zone valves?
With a 40VA rating, this unit can typically support several low-draw zone valves or a single heavy-duty actuator. Always calculate the total VA load of your components to ensure it does not exceed 40VA.
How do the leadwires simplify the install?
The 9-inch leads are pre-stripped and color-coded to match standard 120V circuit configurations, reducing the risk of wiring errors during high-voltage primary connections.
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
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Description
The Resideo AT72D1188 Transformer is a heavy-duty, plate-mounted solution designed for consistent step-down power in 24V control circuits. This 40VA HVAC transformer features a 120V primary input and a 24V secondary output, making it a standard choice for technicians servicing thermostats, gas valves, and relays. Engineered for industrial-grade durability, it includes a NEMA Type D rating and a 4"x4" mounting plate designed to secure onto a junction box without protruding internally, preserving critical space for wiring. The primary side utilizes 9-inch color-coded leadwires for rapid identification, while the secondary side provides stable screw terminal connections. This 120V to 24V step-down transformer is built with integrated override protection and meets NEC Class 2 (not wet) and Class 3 (wet) requirements. Whether for residential furnace upgrades or commercial air handling units, this energy-limiting transformer provides the reliable voltage regulation required for modern HVACR control systems.
Key Benefits- Space-Efficient Plate Mounting: The 4"x4" plate ensures a flush fit on standard electrical boxes, preventing obstruction within the housing.
- Enhanced Circuit Safety: Integrated override protection and energy-limiting design meet UL 1585 and NEMA Standard DC20-1992.
- Streamlined Installation: 9-inch color-coded leads simplify primary high-voltage wiring for faster field swaps.
- Broad Compatibility: The 40VA power rating is ideal for multi-stage thermostats, hydronic zone valves, and pilot-duty relays.
- Industrial Resilience: Rated for operation in ambient temperatures ranging from -20°F to +105°F.
What is the difference between NEMA Type D and other mounting styles?
NEMA Type D indicates the transformer is specifically designed for plate mounting on a 4x4 junction box, ensuring the core remains external to the box to maintain air gap and prevent overheating of internal wires.
Can the AT72D1188 handle multiple zone valves?
With a 40VA rating, this unit can typically support several low-draw zone valves or a single heavy-duty actuator. Always calculate the total VA load of your components to ensure it does not exceed 40VA.
How do the leadwires simplify the install?
The 9-inch leads are pre-stripped and color-coded to match standard 120V circuit configurations, reducing the risk of wiring errors during high-voltage primary connections.
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.
