Carrier TC-PHP Owner's Manual page 22

PROGRAMMING THE THERMOSTAT
The thermostat has preset periods (see below), but you can change these to fit your
lifestyle.
Period
P1
P2
P3
P4
What time blocks work for you? Write them in here and refer to this as you
make the changes on the thermostat.
Period
P1
P2
P3
P4
Preset Hours
6:00 AM to 8:00 AM
8:00 AM to 5:00 PM
5:00 PM to 10:00 PM
10:00 PM to 6:00 AM
Your Hours
20