air conditioner wont come on

i installed my own central air when i hooked up the stat wires to the funace circuit board on c the 5amp fuse blows even before hooking up the condenser wires from outside i need advise badly

thanks
terry

 

There's a short somewhere. Check wiring carefully.

The control circuit wire between the furnace and a/c should have two conductors - Hot connected to Y, neutral connected to C.

A five (minimum) conductor cable is needed between the stat and furnace to power the stat with a common; it's straight forward -> R-R, C-C, G-G, etc.

When you installed the a/c, did you...

- Use a vacuum pump?
- Use a new matching evap coil and put the right piston (or txv) in it?
- Set the blower speed correctly for the size of a/c?

If not, it's a good idea to get a tech to check the install and do the startup (including but limited to checking the refrigerant charge in accordance with manufacturer's instructions)