Armstrong 42J32 Furnace Transformer

Armstrong 42J32 Furnace Transformer is a compact, reliable transformer designed for use on furnaces. It features a 120 Volt AC primary and a 24 Volt AC secondary, delivering steady low-voltage power for control circuits and ignition systems. Built to fit tight spaces, its overall dimensions are 2.67" W x 2.25" D x 2.25" H, and it operates at a standard 60 Hz to match typical residential and commercial furnace timings. With a 40 VA power rating, this transformer delivers ample current for most furnace control boards while maintaining energy efficiency and low heat output. Ideal for replacements on Armstrong-brand equipment or compatible furnace models, it is engineered for dependable performance in demanding environments.

Designed for easy installation, this transformer uses standard mounting patterns and connector compatibility with common furnace control boards. Its rugged construction helps withstand heat, vibration, and electrical noise in busy furnace rooms. The 120V input and 24V output support a wide range of relays, gas valves, and safety circuits, ensuring smooth operation during cold seasons. Because this unit is a drop-in replacement on many Armstrong systems, technicians appreciate minimal downtime and straightforward wiring.

• Model: Armstrong 42J32
• Primary input: 120V AC
• Secondary output: 24V AC
• Power rating: 40 VA
• Frequency: 60 Hz; Dimensions: 2.67" W x 2.25" D x 2.25" H
• Used On Furnace / Compatible with Armstrong equipment