HVAC Licensing Exam Study Guide in Visual Studio .NET

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FIGURE 132 Ladder diagram for a hot-air furnace
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LADDER DIAGRAMS Electrical schematics are used to make it simple to trace the circuits of various devices Some of these can appear complicated, but they are usually very simple when you start at the beginning and wind up at the end The beginning is one side of the power line and the end is the other side of the line What happens in between is that a number of switches are used to make sure the device turns on or off when it is supposed to cool, freeze, or heat The ladder diagram makes it easier to see how these devices are wired It consists of two wires drawn parallel and representing the main power source Along each side you find connections By simply looking from left to right, you are able to trace the required power for the device Symbols are used to represent the devices There is usually a legend on the side of the diagram to tell you, for example, that CC means compressor contactor, EFR means evaporator fan relay, and HR means heating relay (see Figure 133) Take a look at the thermostat in Figure 133 The location of the switch determines whether the evaporator fan-relay coil, the compressor-contactor coil, or the heating-relay coil is energized Once the coil of the EFR is energized by having the thermostat turned to make contact with the desired point (G), it closes the points in the relay, and the evaporator fan motor starts to move This means that the low voltage (24 volts) has energized the relay The relay energizes and closes the EFR contacts located in the high-voltage (240 volts) circuit If the thermostat is turned to W or the heating position, it will cause the heating-relay coil to be energized when the thermostat switch closes and demands heat The energized heating-relay coil causes the HR contacts to close, which in turn places the heating element across the 240-volt line, and it begins to heat up Note that the HR contacts are in parallel with the evaporator fan-relay contacts Thus, the evaporator fan will operate when either the heating relay or the evaporator fan relay is energized
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Heating Circuits
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FIGURE 133 Ladder diagram for a heat-andcool installation
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MANUFACTURER S DIAGRAMS Figure 134 shows how the manufacturer represents the location of the various furnace devices The solid lines indicate the line voltage to be installed The dotted lines are the low voltage to be installed when the furnace is put into service The motor is four speed It has various colored leads to represent the speeds You may have to change the speed of the motor to move the air to a given location Most motors come from the factory with a medium-high speed selected The speed is usually easily changed by removing a lead from one point and placing it on another where the proper color is located In the schematic shown in Figure 135, the fan motor has a white lead connected to one side of the 120-volt line (neutral), and the red and black leads are switched by the indoor blower relay to black for the cooling speed and red for the heating speed It takes a faster fan motor to push cold air than hot air because cold air is heavier
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FIGURE 134 Manufacturer s diagram for a hot-air installation
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In Figure 135, the contacts on the thermostat are labeled R, W, Y, G, R, and W They are used to place the thermostat in the circuit It can be switched from W to Y manually by moving the heat-cool switch on the thermostat to the cool position Notice in Figure 135 that the indoor blower-relay coil is in the circuit all the time when the auto-on switch on the thermostat is located at the on position The schematic also shows that the cool position has been selected manually, and the thermostat contacts will complete the circuit when it moves from W1 to Y1 In Figure 134, note that the low-voltage terminal strip has a T on it This is the common side of the low voltage from the transformer In Figure 135, the T is the common side of the low-voltage transformer secondary In Figure 134, the T terminal is connected to the compressor contactor by a wire run from the terminal to the contactor Note that the other wire to the contactor runs from Y on the terminal strip Now go back to Figure 135, where the Y and T terminals are shown as connection points for the compressor con-
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