Hello, Namalee -
I find that the Nordyne brand is what is called a "legacy brand" owned by Nortek Global HVAC.
https://www.nortekhvac.com/That means Nortek owns the brand name and nothing is currently manufactured with the Nordyne name.
I have looked through the Nortek Global HVAC web pages and have not found any source for a wiring diagram for your model Nordyne furnace.
I suggest you telephone the company (headquaters in O'Fallon, Missouri - Central Time zone) and ask if the company can provide you with a wiring diagram or direct you to a reliable source for it. This is the toll free phone number I found on the Nortek website:
800-422-4328
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