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Sounds like you have what is known as a Delta or stinger leg,This is not uncommon with 3 phase power.It is considered a stinger leg or a hot leg.
The Delta Wye is just an electrical service provided to buildings such as large industrial plants or buildings where high voltage is used. The only thing you need to be concerned about is that the transformer in thee units is supplied by the normal legs rather than the "hot" leg.
I once asked a technician fro the local power company to explain this and he told me I would almost have to be mathematical scientist to understand the angle and phasing of the electrical triangle.
The delta leg is not going to be an issue with the contactor.
If you would like ,I can send this to category mods and ask them to refund your deposit and then you can ask the question requesting an electrical engineer rather than an HVAC tech.
Let me get you t do this. Check between the two wires that go to the inducer, If we are getting 460v between them, that is fine.The only thing we need to make sure the stinger is not going to is the transformer.
You should be getting 460 between these legs.I am going to open this to other experts who may be able to assist better with this.I have opted out of the question to see if perhaps other experts may have more information and can assist.Please do not rate or reply as that will send question back to my desk.Please stand by to see if another expert can assist further.
No problem, Please stand by to see if another expert has more ideas.
WE should have the 460 between them, Disconnect from motor and see if we have it on the wires.
So is it working now?