Multi-mode auto changeover system

摘要

An auto changeover mechanism for a thermostat. A heat and cool mode auto changeover with single or crossed setpoints may be an approach for doing a single setpoint auto changeover, an approach that can handle auto changeover with separate heat and cool setpoints that do not require the cool setpoint to always be higher than the heat setpoint, and also an approach that does not necessarily require a dead band between the setpoints. A hysteresis may be associated with switching to the other mode. The thermostat having the auto changeover mechanism may have a display of a mode that automatically changes between heat and cool.

主权项

1. A thermostat device for a heating, ventilation and air conditioning system of a building, comprising:
a user interface; and an auto changeover connected to the user interface, for switching from one mode to another mode according to the temperature of the space at a set amount of time relative to a time a temperature controlled space reaches a cool setpoint or heat setpoint, and having adjustable hystereses above and below the cool and heat setpoints, respectively; and an emergency heat component having a button to activate emergency heat; wherein: the user interface displays a mode of the thermostat and automatically indicates a heat or cool mode that is in effect; the auto changeover is always allowed; and the auto changeover can be manually deactivated and activated; when the emergency heat is activated, a system switch automatically changes the thermostat to heat and the auto changeover is automatically deactivated; when the auto changeover is activated, the emergency heat is deactivated; and when the system switch is changed to cool or off, the emergency heat is automatically deactivated.