Learn how contactors in HVAC systems use a 24-volt coil to control power flow, how they operate to supply 240 volts to compressors and fan motors, and common failure causes like obstructions or arcing. Understand how sealed contactors protect against insect damage.

Understand the purpose of a B-flow dryer filter in HVAC systems to block water and dirt from the refrigerant. Learn the importance of proper installation direction and careful brazing techniques to protect the internal moisture and debris-catching components.

Understand the role and testing of an HVAC fan relay, which uses 24 volts to activate and powers the fan motor with 240 volts (split as 120 volts per side). Learn to safely troubleshoot by checking voltage at the relay and testing the thermostat wiring to diagnose fan issues

Learn about manifold gauge sets with high and low sides that measure pressure and temperature for refrigerants like R-22 and R-410A. Understand the importance of inspecting hoses for damage, using low-loss fittings, and protecting hoses from sunlight to prevent leaks, avoid EPA fines, and ensure safe handling of refrigerants.

Learn how electric heat strips provide warmth in furnaces and heat pumps, working as emergency or primary heat sources. Understand their components—contactor, thermostat, and fuse links—and how to test each for proper function and safety.

Covers heating elements in electric furnaces and heat pumps, including contactors, thermostats, and fuse links. Learn how to troubleshoot by checking contactors, matching thermostat temperatures, testing fuse links for continuity, and ohming elements after removing wires. Also, understand the importance of pre-stretching new elements and verifying fuse link ratings.

Demonstrates a ratchet-style tubing bender that bends copper HVAC line sets from 1/4" to 7/8", allowing precise bends like 90 degrees on installed pipes.

Shows how to fix a hole in a line set by carefully building up silver solder over the leak, creating a sealed “bridge” without needing a coupling—ideal for tight spaces.

Covers how to check if an HVAC outdoor unit is working properly. Learn how to verify power at the contactor, test compressor and fan motor activation, and use a jumper wire to diagnose issues with the thermostat or control wiring

Explains how the reversing valve in a heat pump works, how to test its function, and how to avoid damaging it during replacement. Includes tips for safely brazing and troubleshooting a jammed valve caused by copper debris.