I need help wiring my furnace.

Green is ground, the two blacks are hot and neutral. The orange is what im uncertain of. Especially if you need to run it to the panel....Ive only ever seen three wires run to the panel on 120v. Black (hot), white (neutral), green (ground). The piece of white tape around the one black wire tells me that it was previously used as the neutral (or if they were half wits, it was the hot. You should trace it back to the load source). Sometimes it doesnt matter what wire you use for neutral, sometimes, it does. In this case it looks like the previous owner of this furnace was decifering (sp?) between the two, so I would say it does matter.

Orange is typically used as a power wire. However, Ive never seen it run into a panel.

Where is the orange coming from? The only thing that makes any sense to me is that it could be used for a second speed on the blower. In this situation, you would need a double throw switch to wire it into before taking it to the panel. The green will go to the grounding bar inside the panel. Or to the ground screw inside the fusetron, unless this whip is already coming out of the fusetron?

Sorry, this is all I can help without more info.

Green is NORMALLY Ground, and orange is not normal. What is at the other end? The black line with the "FOR GROUNDING ONLY" looks like is is used for power, not ground in this case. I believe the answer lies at the other end of the wires you are holding. Have you tried contacting Newmac to see if they can send you a manual?

with out knowing whats on the other end of the wires it is hard to say. one black wire may be used as a nutral, other could be power fan switch and orange could be for cumbustion blower (hooked up with thermostat). But all of this is guessing.

still hard to tell from the pictures. If you can draw a picture of where the wires are going with colors labeled and post it ,it may help out alot

Maybe the red is to firematic protection on ceiling, thermocoulpe on duct or relay to main duct blower ? This was a take out unit so it could be a wire to anything.
Best bet would be to get info from Newmac as suggested and rewire for your setup.