Trane XT500C Owner's Manual page 65

Preprogrammed Schedule
The preprogrammed schedule consists of the four periods (Wake, Leave, Return and Sleep) and accompanying
temperatures programmed into your thermostat at the factory. See Tables 1 and 4.
Period
One of the four times of the day (Wake, Leave, Return or Sleep) that you can program a setpoint or setpoints.
Setpoint
Setpoint is the temperature setting you select for a schedule or for a Hold. The setpoint can be either the heating
temperature you set or the cooling temperature. Setpoint does not refer to actual room temperature or outdoor
temperature.
System
System refers to either the heating and cooling mechanics. For example, when the System is set to Heat, the
heating mechanics operate according to the heating setpoint. The thermostat selects the System when set to
Auto. Some installations allow you to turn the System off (neither heating nor cooling will operate).
Pub. No. 22-5128-02
65 69-1216