I recently repaired the vent pipe for my heating/air unit, however I am getting a lot of condensation on my unit coils etc. Is this normal?

If unit is running properly and it is hot and humid you will get a considerable amount of condensation. Is your house cool and comfotable? Is the filter clean. If all is normal and the condesate water is exiting the unit properly I say what you see is normal. Good Luck