Patent ID: 11940189
Assignee: GOODMAN MANUFACTURING COMPANY LP
Field: Thermal processes and apparatus (Mechanical engineering)
Classification: CPC F | IPC F

Claim 7:
8. A method of defrosting a heating, ventilation, and air conditioning (“HVAC”) system operable to use a refrigerant to heat or cool an indoor space, the method comprising:
compressing the refrigerant with a compressor;
activating a defrost mode and during the defrost mode:
flowing warmed and compressed refrigerant from the compressor through a four-way valve and an outdoor heat exchanger to defrost the outdoor heat exchanger; and
flowing a supply airflow across an indoor heat exchanger while not substantially cooling the indoor space by measuring a temperature of the supply airflow using a supply air temperature sensor positioned in the supply airflow before the supply airflow enters the indoor space and controlling, using a controller and based on the measured temperature of the supply airflow;
a supply damper within a supply duct to control the supply airflow from the indoor heat exchanger to the indoor space;
a return damper within a return duct to control a return airflow from the indoor space to the indoor heat exchanger; and
a defrost damper to control a defrost airflow between the supply duct, the return duct, and the indoor heat exchanger,
wherein controlling the supply damper, the return damper, and the defrost damper controls the flow of the defrost airflow into the indoor space.