Why won the thermostat bring on second (and/or third) stage of heat or cool?
Multi-stage and Heat Pump Comfort-Set II thermostats are designed to determine the optimum time to activate the second stage. Simply raising the temperature in heating or lowering it in cooling will not always force the thermostat to bring the second stage on quickly. There is a time delay from 0-25 minutes if the system has been reaching your setpoint using the first stage. The time element (0-25 minutes) of the delay varies depending on the performance of the first stage. In Heating, for example, assume for the last 2 hours the thermostat is set on 70 and the room temperature is 70 with the equipment using only the first stage of heat. The thermostat calculates (internally) the performance of the system. Since the equipment is keeping the temperature within 1 degree of setpoint, the thermostat will delay second stage for a longer time if you manually raise the temperature or if the room temperature quickly changes. Once the second stage comes on, it will come on sooner the next time
