You could also temporarily increase the Crop Coefficient. Default would be 65% for Warm Season turf and 70% for Cool Season. A golf course green would be 100%+ 
As @Kubisuro mentioned, a new lawn will have shallow roots. 3-4" may be best for very new turf.
Another thing to consider is the Available Water (aka AWC). Since the young roots (or sod) has short roots, it may not be able to reach a depth where more water is retained during the heat of the day. I have my AW set to .19, well established St. Augustine grass, but on heavy clay loam.
Increasing the CC to 70 and maybe even 80% will increase watering frequency. So will reducing the AW setting. The key to a new lawn: Frequency over quantity.
Good luck!
