Why is my new kitchen faucet banging?
The first time you turn on the water at the faucet and/or sprayer, you'll likely find that the faucet/sprayer spits and bangs. This is normal, and is simply the air being cleared from the supply lines.

Let the water run for a bit, and you should notice the flow return to normal. 

Removing the aerators, and/or other obstructions can help clear the air faster.