Resideo - Honeywell Home AT72D1089 Standard Transformer

AT72D1089 Standard Transformer from Resideo Honeywell Home delivers reliable 24V control for residential combustion systems. The transformer steps down 120V AC input to a steady 24V AC output, making it ideal for thermostat, gas valve, and relay applications.

Key specs include a 120V AC primary, 24V AC secondary, 50/60 Hz operation, and a 40 VA power rating. The enclosure is NEMA Type D, designed for durable residential use, with compact dimensions of 2-7/32 in width x 3-1/16 in depth x 3-7/32 in height. Comes with a mounting foot for secure installation and optimized clearance in tight control panels.

Designed for dependable operation in residential control environments, the AT72D1089 carries UL and CSA approvals for safety and compatibility with standard HVAC components. The included thermostat, gas valve, and relay streamline installation, reducing parts sourcing time for service professionals. Compact, mounting-foot design fits typical control panels with minimal clearance, making it ideal for residential boilers and furnaces.

• Primary Voltage: 120 V AC
• Secondary Voltage: 24 V AC
• Power Rating: 40 VA
• Frequency: 50/60 Hz
• Enclosure: NEMA Type D
• Size: 2-7/32 in W x 3-1/16 in D x 3-7/32 in H
• Mounting: Mounting Foot
• Application: Residential combustion control system
• Approvals: UL, CSA
• Includes: Thermostat, Gas Valve, Relay