Free printable HVAC electrical reference. Ohm's Law, motor types, transformer formulas, control wiring basics, and how to read ladder diagrams.

What’s inside

• Ohm's Law and power formulas (V=IR, P=VI)
• Single-phase motor types — PSC, CSIR, CSCR, ECM explained
• Transformer sizing and wiring — 24V control circuit basics
• Capacitor types and how to test them
• How to read a ladder diagram — tracing control circuits
• Common HVAC electrical faults and how to diagnose them

How to download / print

1. Click Open Printable Version below.
2. In the new tab, click the blue Save as PDF / Print button at the top.
3. Your browser print dialog opens — choose Save as PDF (Ctrl+P / Cmd+P).
4. To print on paper: choose your printer and select Fit to page.

This guide is for study use only. It is a quick reference, not a substitute for the full NEC codebook or official exam preparation materials.