About Advanced Features & Operation
MEMORY BACKUP - In the event of a power loss, the thermostat will retain the stored program settings without external power or batteries.
2 STAGE OPERATION - The 2nd Stage of heat or cool is turned on when (1) the 1st Stage has been on for a minimum of two minutes, and (2) the temperature spread from the setpoint is equal to or greater than: the setpoint plus the deadband, plus 2 degrees.
Heating | Cooling |
2 degrees
Dead Band
Dead 
Band
2 degrees
2nd Stage | 1st Stage | Heat | Cool | 1st Stage | 2nd Stage |
turn on | turn on | Setpoint | Setpoint | turn on | turn on |
MINIMUM HEAT/COOL SETPOINT DIFFERENCE - The Heat and Cool setpoints will not be allowed to come any closer to each other than the value set in Advanced Setup step
#7, on page 13. This minimum difference is enforced during Auto changeover and Program On operation.
PROGRAMMABLE FAN - If the Programmable Fan timer is set to a value other than 0, the fan will run for the preprogrammed amount of time, page 14, step# 10. The Programmable Fan timer will start the fan at the top of each hour. The Programmable Fan may be active even if the thermostat mode is Off.
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