Your shifter probably is 'zeroed' or your not adjusting the cable slack as recommended in the literature.
1. Disconnect the cable from the FD.
2. Pull hard on the cable with 1 hand while shifter the STI lever with the other.
3. There should be 2 clicks in each direction.
3a. Shifting from the small ring to big the first click is for 'trimming' the FD.
3b. Shifting from the big ring to the small ring the first click is to trim the FD.
4. Pull hard and make sure the lever really is in low gear.
5. Adjust adjusting barrel so the inner meatl part is flush with the outer platic part. You must have an adkjusting barrel or it will never properly adjust.
6. Re-attach cable.
7. Shift into the bi ring in the front and the big cog in the back. YES. big/big
8. 'Trim' FD by click the STI lever once
9. Adjust barrel adjuster so that there's .5mm clearnace between the FD and chain.
This should get you started:
http://www.birota.ru/manuals/shimano...e/6JA0A_EN.PDF
http://techdocs.shimano.com/media/te...9830621239.PDF