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HVACR214 – Electrical for Oil

HVACR214 – Electrical for Oil. Transformers. The transformer. The transformer is a non-mechanical electrical device. Transformers are both a load and a source. The primary side of the transformer uses electrical current. The secondary side of the transformer produces electrical current.

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HVACR214 – Electrical for Oil

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  1. HVACR214 – Electrical for Oil Transformers

  2. The transformer • The transformer is a non-mechanical electrical device. • Transformers are both a load and a source. • The primary side of the transformer uses electrical current. • The secondary side of the transformer produces electrical current.

  3. The Transformer

  4. The Transformer

  5. The transformer primary • Is the side of the transformer that voltage and current is applied to. • This is a set of windings wrapped around an iron core. • These windings produce a magnetic field.

  6. The transformer secondary • This is the side of the transformer which produces electrical current. • These windings are also wrapped around a magnetic core. • The secondary side is electrically isolated from the primary, it is its own circuit.

  7. Windings

  8. Types of transformers • A step down transformer reduces voltage from the primary to the secondary. • A step up transformer increases the voltage from the primary to the secondary. • The ratio of windings between primary and secondary determines how much the voltage is changed.

  9. Winding Ratio • Keeping it real simple, if the primary side has 10 windings and the secondary side has 1 winding, this is a ration of 10:1. • In this case if the transformer is supplied with 120v it will deliver 12 volts on the secondary side.

  10. Transformer ratings • Transformers are rated by voltage on the primary side and volt amps on the secondary side. • Most primary voltages in the HVAC industry are 120, 208/230, 240, 480. • Secondary side of the transformer in the HVAC industry is 24 volts. In reality this can range from 24 to 28 volts. • To establish the VA rating: Secondary volts X Secondary Amps = VA

  11. Troubleshooting Transformers • First, check for source on the primary side. • If you have voltage, check for voltage on the secondary side. • If no voltage check for a fuse or breaker and reset. • If still no voltage on the secondary, it is a bad transformer. Replace it!

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