1 HVACR214 – Electrical for Oil Transformers. 2 The transformer The transformer is a...
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Transcript of 1 HVACR214 – Electrical for Oil Transformers. 2 The transformer The transformer is a...
![Page 1: 1 HVACR214 – Electrical for Oil Transformers. 2 The transformer The transformer is a non-mechanical electrical device. Transformers are both a load and.](https://reader036.fdocuments.us/reader036/viewer/2022072010/56649db25503460f94aa0efe/html5/thumbnails/1.jpg)
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HVACR214 – Electrical for Oil
Transformers
![Page 2: 1 HVACR214 – Electrical for Oil Transformers. 2 The transformer The transformer is a non-mechanical electrical device. Transformers are both a load and.](https://reader036.fdocuments.us/reader036/viewer/2022072010/56649db25503460f94aa0efe/html5/thumbnails/2.jpg)
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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.
![Page 3: 1 HVACR214 – Electrical for Oil Transformers. 2 The transformer The transformer is a non-mechanical electrical device. Transformers are both a load and.](https://reader036.fdocuments.us/reader036/viewer/2022072010/56649db25503460f94aa0efe/html5/thumbnails/3.jpg)
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The Transformer
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The Transformer
![Page 5: 1 HVACR214 – Electrical for Oil Transformers. 2 The transformer The transformer is a non-mechanical electrical device. Transformers are both a load and.](https://reader036.fdocuments.us/reader036/viewer/2022072010/56649db25503460f94aa0efe/html5/thumbnails/5.jpg)
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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.
![Page 6: 1 HVACR214 – Electrical for Oil Transformers. 2 The transformer The transformer is a non-mechanical electrical device. Transformers are both a load and.](https://reader036.fdocuments.us/reader036/viewer/2022072010/56649db25503460f94aa0efe/html5/thumbnails/6.jpg)
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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.
![Page 7: 1 HVACR214 – Electrical for Oil Transformers. 2 The transformer The transformer is a non-mechanical electrical device. Transformers are both a load and.](https://reader036.fdocuments.us/reader036/viewer/2022072010/56649db25503460f94aa0efe/html5/thumbnails/7.jpg)
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Windings
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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.
![Page 9: 1 HVACR214 – Electrical for Oil Transformers. 2 The transformer The transformer is a non-mechanical electrical device. Transformers are both a load and.](https://reader036.fdocuments.us/reader036/viewer/2022072010/56649db25503460f94aa0efe/html5/thumbnails/9.jpg)
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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.
![Page 10: 1 HVACR214 – Electrical for Oil Transformers. 2 The transformer The transformer is a non-mechanical electrical device. Transformers are both a load and.](https://reader036.fdocuments.us/reader036/viewer/2022072010/56649db25503460f94aa0efe/html5/thumbnails/10.jpg)
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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
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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!