LOW AMBIENT COOLING SCHEME AND CONTROL
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United States of America Patent
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Issued Date -
Feb 2, 2017
app pub date -
Jul 30, 2015
filing date -
Jul 30, 2015
priority date (Note) -
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Abstract
A system and method for controlling pressure during low ambient conditions when operating in a cooling mode are provided. One or more controllers may be operable to receive a measurement of a first head pressure at a refrigerant line and determine whether the first head pressure is below a pre-determined minimum head pressure threshold. The one or more controllers may be further operable to send an instruction to open a hot gas bypass valve in response to a determination that the first head pressure is below the pre-determined minimum head pressure threshold and a speed of one or more outdoor fan motors is less than or equal to a pre-determined minimum operating fan speed.
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