Patent ID: 11874006
Assignee: JOHNSON CONTROLS TYCO IP HOLDINGS LLP
Field: Thermal processes and apparatus (Mechanical engineering)
Classification: CPC F | IPC F

Claim 8:
9. A tangible, non-transitory, computer-readable medium comprising instructions that, when executed by processing circuitry, are configured to cause the processing circuitry to:
operate a heating, ventilation, and/or air conditioning (HVAC) system in a first mode to transfer heat between a refrigerant and an air flow via an outdoor coil of the HVAC system based on first data, wherein the first data comprises a temperature of the outdoor coil;
operate the HVAC system in a second mode, different from the first mode, to transfer heat between the refrigerant and the air flow via the outdoor coil based on second data when the first data is not received, wherein the second data comprises a temperature of an ambient environment of the HVAC system; and
operate a defrost cycle of the HVAC system in the second mode based on a determination that the temperature of the ambient environment is below a threshold value for a threshold time period.