How do I identify the primary vs

A reading of "open" or infinite resistance typically indicates a cracked or burned-out heating element requiring replacement

Skin oils can create hot spots

For technicians diagnosing a 24V control power loss

this replacement cage assembly features a robust design that supports bi-flow performance

Functional Devices TR100VA004 Transformer How do I identify theThe Functional Devices TR100VA004 Transformer is a professional grade power solution designed for contractors who need versatility and reliability in the field. This 100VA multi tap transformer features a primary voltage range of 120 208 240 277 480 VAC, allowing you to carry one unit that adapts to almost any industrial or commercial power supply. The secondary output provides a steady 24 VAC at 96VA nominal, perfect for powering HVAC control