I just bought a new Polaris Halcyon PB460Q pump when it came it shows it to be wired for a 220v in the U.S is the voltage not 110v. Do I need to change it to 110 or leave it on 220 as it was factory wired.

If the pump says 110/220 then it can use either voltage. By the way, voltage is 120/240 here in the USA.

However if the pump only shows 220 Vac, then you must use a 240 Vac connection.