# Electric Furnace Schematic Wiring Diagram

Posted on Feb 5, 2014

On this diagram, you can easilily locate test points related to Applied Voltage and Potential Voltage. For example, isolating one of the heating elements, we can see that there is an N. O. (Normally Open) switch shown wired in series with it, and the identifiers on this particular switch are M1 and M2 (M, meaning Main set of contacts on a sequencer SEQ #1 in this case . ), and in a sitution in which a technician

would want to find out if this circuit is working like it should, a smple test for Applied Voltage would be a good place to start. Checking with a voltmeter directly at the wiring connections for the heating element to find out if the required 240-volts was being applied or not would allow us to begin to evaluate this particular circuit in the event we were troubleshooting a situation in which the customer was complaining that the unit wasn`t heating properly. And, depending on the results of that test, we would be able to find out if the element itself, or the switches wired in series with it, could be a source of a problem. For the sake of creating a troubleshooting scenario, let`s say that the answer to the question, Is there voltage applied to the element  is no. The reading we get with the meter is 0-volts, not the 240-volts that would allow the element to provide heat as long as it OK, meaning that it would have the proper resistance if we checked it with an ohmmeter. But . I digress. We`re not talking about using an ohmmeter to check resistance, we`re talking about doing a hot  test with a voltmeter to determine which component in the circuit could be a source of the problem, so, back to the idea of Applied Voltage and Potential Voltage . Once our first test showed no Applied Voltage, our next step would be to check the switches wired in series with the element ot see if they were doing what they were supposed to...

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