TRANE wiring for new installation

[SUNNY]

I purchased a new Trane A/c unit. 115vac/20amp/ standard home unit. Three wires are needed for hookup. The TRANE unit has 3 wires for hook-up... Green, Blue, and Yellow wires. Green is grounded. Which wire in the TRANE unit is HOT--- Blue or Yellow??

I have run wires to the unit using standard Romex wire, 12-2 w/ground with a Weather tight/Service-Disconnect box (in line)... It is attached to a 20Amp C/B in the load box. Which wire is hot in trane unit---

I am assuming the BLUE wire is my hot wire which attaches to the Romex hot wire (BLACK)... Then the YELLOW wire (from TRANE unit) will hookup to my WHITE (Common wire). Unit case, and all boxes are grounded using ground wire.
IS THIS CORRECT ???

[Tom L.]

115V unit? Must be a small A/C unit. Is there any way to convert it to 220V? You'll be better off that way.

As for wire colors. It almost sounds like the unit is designed to be interfaced directly with another unit. Is there a 24V control line hookup somewhere so that a thermostat or indoor unit can switch it on and off? If there isnt, your A/C unit was designed to interface with some other unit/device to switch it on /off. Hooking up your supply line to those wires would make it run forever....

As for what wire is what, there should be a wiring diagram on the unit somewhere, or in the manual. Guessing as to what wire is what can be expensive and dangerous. Also, based on the other 2 wire colors, dont automaticaly assume that green is ground. If standards werent folllowed, any color (or none) could be ground.]

If you dont have a manual, go back to where you bought it and ask them for it.

[Wgoodrich]

TomL said "115?" I am adequate in backing up his first words in his reply.

Black and yellow are both hot colors by electrical rules. Most if not all outside a/c units are 220 volts with no use for a nuetral wire.

Look closely on the name plate for VOLTAGE and confirm if is says on the name plate on the side of the casing of your a/c unit and tell us what it says. As TomL said IT IS VERY EXPENSIVE TO GUESS ON THIS SUBJECT.

If you guess you probably will destroy your a/c unit. Be sure of your voltage.

Is this a/c unit an American or European unit? This would make a differece also.

I am strongly thinking along the line that TomL is thinking. YOu most likely have a 220 volt a/c unit and just don't realize it.

Curious

Wg