Min,
It will NOT effect the install. Many users will use the local Admin account and then update it with a Domain Account after the server joins the Domain.
What you will need to do is configure the new account with local Admin access and NT Service Account Local security settings. You will also need to update this account to start the SIA. The best way to test the account is to logon with this account and test that SIA and Tomcat start properly.
Regards,
Ajay
