Abstract: Power stealing circuitry to provide power to a controller for an environmental control system. The power stealing circuitry may include a first circuit, to steal power when a load for a stage is switched off, e.g. de-energized. The power stealing circuitry may include a second circuit, e.g., a power trickle circuit, to steal power when the load is switched on, e.g., energized. The load may include a furnace, electrical heating element, heat pump, humidifier, electrostatic filter, air conditioning unit and so on. In some examples, the environmental control system may have one or many stages, each with a separate load. The controller may include power stealing circuitry for each stage of the environmental control system. In other words, the controller may include a first circuit and a second circuit for each stage of a multi-stage environmental control system.

Abstract: Power stealing circuitry to provide power to a controller for an environmental control system. The power stealing circuitry may include a first circuit, to steal power when a load for a stage is switched off, e.g. de-energized. The power stealing circuitry may include a second circuit, e.g., a power trickle circuit, to steal power when the load is switched on, e.g., energized. The load may include a furnace, electrical heating element, heat pump, humidifier, electrostatic filter, air conditioning unit and so on. In some examples, the environmental control system may have one or many stages, each with a separate load. The controller may include power stealing circuitry for each stage of the environmental control system. In other words, the controller may include a first circuit and a second circuit for each stage of a multi-stage environmental control system.

Abstract: The disclosure describes an environmental control device with a head unit including processing circuitry and one or more sensors configured to send signals to an environmental control system to make adjustments to the room environment. The head unit is configured to connect to a wall plate that supports the head unit. The wall plate may include an ID device configured to identify the type environmental control equipment to which the wall plate is configured to connect. Once connected to the wall plate the head unit may detect the ID device, determine an ID value from the ID device and customize a presentation of setup parameters for the head unit.