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Some Electrical TRaining

Tim McElwainTim McElwain Posts: 4,037Member
Electrical circuit diagrams are pictures or maps, which show all components of a circuit in relation to one another. They are the road maps, which show the path of the flow of electricity and are useful in understanding how a particular circuit performs its functions and are essential for troubleshooting appliance electrical troubles


  • Tim McElwainTim McElwain Posts: 4,037Member
    Two forms of pictorial representations of circuits are commonly used for gas appliances: connection diagrams and schematic diagrams. ANSI standards now require appliance manufacturers to supply both forms.
  • Tim McElwainTim McElwain Posts: 4,037Member
    Connection Diagram
    A connection diagram shows the connections of an installation or its component devices or parts. It may cover internal or external connections or both, and contains such detail as is needed to make or trace circuit connections that are involved. The component devices or parts are usually shown in a connection diagram in the actual general physical arrangement. This diagram helps locate the circuit portions on the appliance. The illustration below is a typical connection diagram of a forced air furnace.

  • Tim McElwainTim McElwain Posts: 4,037Member
  • Tim McElwainTim McElwain Posts: 4,037Member
    The previous diagram is a Connection Diagram. It has the following controls:
    1. Fan Control Center
    2. Single Seated V800 Honeywell Gas Valve
    Honeywell L4064 Fan/Limit control (temperature on temperature off)
    3. Blower Motor
    4. The thermostat would be wired to "R" and "W" if the Control Center is used on a boiler the thermostaat would be wired to "R" and "G".
    This is an older system found on a lot of warm air systems. Warm air systems today use an Electronic Fan Timer (Time on Time off) for control of the system blower.
  • Tim McElwainTim McElwain Posts: 4,037Member
    Fan Control Center
    The use of a Fan Control Center on a warm air furnace is a convenient place to connect wires and also makes for easier troubleshooting. The transformer has the wiring connections attached. The "R" and "C" terminals are your only actual voltage connections. The other terminals are for wiring connections. On warm air systems the thermostat is typically wired to the R and W terminals.
  • Tim McElwainTim McElwain Posts: 4,037Member
    I was posting this same info on another place on the internet and was told it is confusing and to stop posting it. Let me know if you are interested in this type of training here on Heating Help. I guess I am getting old and am perhaps out of touch with how folks are looking at training on the internet. If it is helping anyone I will keep posting if not then they can take it down.
  • Electronics are my weak point. I'd love to learn more.
    Often wrong, never in doubt.
  • ratioratio Posts: 1,478Member
    The more discussion the better! If it's confusing, ask. I really like to explain things in a way that gets the point across, but I can't tell through the internets if it's getting there or not.
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