Transcription of UNDERSTANDING ELECTRICAL SCHEMATICS
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UNDERSTANDING ELECTRICAL SCHEMATICS
INTRODUCTIONIn this section, you will take alook at a packagedgas/electric system, which is a relatively complexheating and cooling unit. The wiring diagram for thisequipment is more difficult than those you studied inPart 1 but again, the schematic as a whole can besimplified by breaking it down into its basic you examine individual control circuits and theassociated components that they operate, the overalldiagram becomes easier to understand, as do thevarious machine functions. The SCHEMATICS in thissection may include some symbols with which youare not familiar. For your convenience, many of theschematic symbols currently used and recognized bythe HVAC/R industry are collected in Figure 16 at theend of this SYMBOLSG enerally speaking, a wiring schematic shows thecondition of a piece of equipment when there is nopower being applied to the unit.
(found on page 10). As you can see, control relay CR-1 has five sets of contacts that are operated by one coil. The first twosets of contacts,CR-1a and CR-1b, are found on lines 42 and 48, respectively (see Figure 10B). The third set, CR-1c, is found on line 77 (see Figure 10C). The fourth set, CR-1d, is found on line 149 in the low-voltage ...
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