The following video shows a basic run down about wiring diagrams. Herein you will get detail explanations on how to read a HVAC wiring diagram which consists of the following electrical parts and components: 5 pin relay, fuse block, 3 pole contactor, control transformer, terminal block, hi pressure switch, low pressure switch, condensing fan motor, compressor, reversing valve, low ambient lockout controller, disconnect switch, terminal strip, time delay, heat strip coil, ground lock terminal, limit switch, and other components. (source:

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