HVAC Electrical Training Board

For Wiring, Components, Wiring Diagrams, Troubleshooting

Instructors are always looking for a low cost, hands-on project that is safe to teach their students about HVAC electrical wiring, components, thermostats, thermostat wiring, and an intro to electrical troubleshooting. This small electrical training board can be built by each student and it allows each student to get some hands-on training.

The teacher can provide the step by step instruction and after the project is built, the teacher can set faults into the board for the student to find using their multimeter. The key is to make sure the faults are not visible and to make the students find each problem using the multimeter. The student should NOT pull any connections out to try to find the problem but only find the issue by using the multimeter and explain the issue to the teacher to prove that they understand it before fixing it.

What the Board Teaches

Thermostat Wiring
Thermostat Function
Common Electrical Components
Line Voltage Electrical Wiring
Reading Wiring Diagrams
Intro to Electrical Troubleshooting

The electrical board replicates the thermostat functions of a forced air gas furnace with air conditioning. Instead of using a control board, this board uses electrical relays and switches to perform tasks. The sheet metal base serves as the electrical ground frame and the GFCI is the protection device for the training board. As the teacher moves through this training, the student may add additional components to the board to increase difficulty, such as extra timing mechanisms.

Packard Electrical Components Used

PR380 — Fan Relay, SPNC/SPNO, 24v coil
POP3 LI'L Popper — 24v circuit breaker, 3 amp
HS24A343 — Heat Sequencer, double pole N/O
PR340 — General Purpose Switching Relay, DPDT, 24v coil
C130A — Single Pole Contactor, 24 volt, 30 amp
PF42440 — Multi-Tap Transformer, 120v, 208v, 240v primary, 24v secondary
PTD102 — Delay-On-Make Timer

DiversiTech Tools Used

FTL3 — Alligator Test Leads
MAG-1 — Magnet Jumpers

Downloadable Wiring Diagrams and Measurement Layout

Thank You

Thanks to Packard and DiversiTech for their encouragement in creating this electrical training board and the associated wiring diagrams to benefit HVAC instruction. Thanks also to instructor Ty Branaman — his video channel.

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