Students begin by learning the schematics and circuits of a 20-ton Lennox rooftop unit (click to expand) |
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Then they move onto the actual unit, including taking amperage readings with their amp meter... |
...and then identify all the components...  |
...including the two-stage burner... |
...and the circuit board.  |
Students compare notes...  |
...and use analog manometers to measure gas input pressure and the regulated pressure. |
Circuit board and components in the wiring panel (click to expand) |
During a break, the instructor and students talk about the exercise. |
Heating, Air Conditioning & Refrigeration Technology
