12 V
If it is a 240 volt conditioner it will stop. If it is a 120 volt conditioner it will stop if it is on the leg that has been lost.
Usually in the air handler
yes
I don't think you can buy a 4000 volt air conditioner.
Yes the 115 volts you read is just the maximum it will handle.
The wire sizing of any equipment is related to the amperage that the equipment draws. Look on the air conditioner and restate the question and give the amps that the unit uses and at what voltage.
No, the RPMs of the motor will be wrong and the compressor will be damaged.
Freon for your cars air conditioner
That depends on the size and application of the unit. An automotive system runs off of 12 volts. In the USA, a household unit is 110 or 220 volt.
15000btu is the largest and that's a 115 volt basically the same ,you just need a higher breaker is all
Freon for your cars air conditioner