Low ambient cooling kit for variable refrigerant flow heat pump
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United States of America Patent
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May 24, 2016
Grant Date -
Sep 18, 2014
app pub date -
Jun 3, 2014
filing date -
Aug 11, 2010
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Abstract
Systems and methods for low ambient air temperature cooling in air-source based heat pump systems wherein an outdoor heat pump unit includes a discharge hood positionable over its fan. The hood including a damper that is openable and closeable as a function of outside temperature. The outdoor unit may also include wind deflectors positioned over the coil openings of the disclosure. During cooling operations below a low outside air threshold temperature, e.g., below 23° F., the damper assembly partially closes to reduce airflow across the condenser coil of the outdoor unit to a level below that which is possible at minimum fan speed. As the outdoor temperature continues to drop, the damper assembly continues to close to further reduce airflow.
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