What Are the Wiring Diagrams for a Nordyne AC Circuit Board?

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A Nordyne A/C circuit board comes standard in all Nordyne electric furnaces. In addition, the circuit board can be purchased on its own and installed to replace an old or malfunctioning circuit board in your heating system. This particular type of board can only be installed if a heat or split system A/C unit has already been installed in your home. While wiring diagrams are a visual representation of how the circuit board connects, these diagrams can be broken down into three essential parts.

Furnace Control Panel

  • The furnace control panel is located to the left of the main A/C circuit board and is connected to eight unique connectors on the main circuit board. The furnace control panel connects to these eight connectors through 24 connectors of its own. The first set of 12 connectors are referred to as Low, Med-Lo, Med-High, High, 240V L1, and 240V L2, each of which have two connectors. The other 12 connectors are labeled Seq 1 (W2), Seq 2 (W2), 24V COM, 24V HOT, G, and OPEN.

Blower Motor

  • The Blower motor is in the back middle portion of the Nordyne A/C Circuit Board and is used to power up the entire board. It attaches to the main circuit board through a series of five connections. While the circuit board itself allows for a sixth connection, only five are typically used. The five connectors are labeled 1 to 5 on the A/C board and referred to as L, ML, MH, H and C on the blower motor.

H/P Section

  • The H/P section breaks down into two unique sections: the T-Stat and the O.D. The main circuit board has seven connections, each of which extends two wires, one to each section of the H/P. The A/C board connectors are labeled R, C, Y, O, W2, W/E and G. The T-Stat section of the H/P has the same names for its connectors, except W/E is replaced with E. The O.D. section is labeled R, C, Y, O, E and W2.

Caution

  • While Nordyne offers clear and cogent owners manuals to help you work on and repair your A/C circuit board, working with electrical appliances can be potentially dangerous. If you are not sure what you are doing, hire an electrician to properly wire and install your A/C circuit board. If you are going to work on the board yourself, make sure all electricity flowing to and from the Nordyne system is shut off for the duration of the installation.

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