Patent ID: 11867420
Assignee: JOHNSON CONTROLS TYCO IP HOLDINGS LLP
Field: Thermal processes and apparatus (Mechanical engineering)
Classification: CPC F  G  H | IPC F  G  H

Claim 21:
22. A device in a heating, ventilation, or air conditioning (HVAC) system, the device comprising:
one or more circuits configured to:
generate a control signal for HVAC equipment by executing a backup control algorithm responsive to determining that a connection to a local wireless network cannot be established, wherein the control signal is based on a setpoint provided via a user device to a headless thermostat device via a local wireless connection using the local wireless network and received via a first network, and the backup control algorithm uses historical data associated with the HVAC equipment to determine the control signal by estimating an indoor temperature ata particular point in time that results from operating the HVAC equipment for a particular length of time with one or more particular operating settings to control the indoor temperature indicated by the historical data and generating the control signal with the indoor temperature and the setpoint; and
provide the control signal to the HVAC equipment to affect operation of the HVAC equipment, wherein the HVAC equipment comprises an adapter unit;
wherein determining that the connection to the local wireless network cannot be established comprises determining that a wireless connection between the adapter unit and a headless thermostat device cannot be established, and
wherein the headless thermostat device is structured without a display and without any mechanism for manually receiving control inputs from a user.