UNDERSTANDING ELECTRICAL SCHEMATICS - RSES

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. Therefore, if a switchis depicted as being normally open(N/O) or normallyclosed(N/C), remember that the position of theswitch is shown as it appears when there is no powerapplied to that circuit.

mally closed single-pole, single-throw (SPST) switch. This type of switch either opens or closes one circuit. Figure 1B shows a single-pole, double-throw (SPDT) switch. Again, only one circuit can be controlled at any given time, but in this case the switch has two dif-ferent “connected” positions, which means that it can

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  Switch, Worth, Single, Pole, Spst, Single pole, Single throw

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