Air conditioning system for low ambient cooling

Details Air conditioning system for low ambient cooling Air conditioning system for low ambient cooling

2007-01-22

2011-10-18

Norman, Marc E (Department: 3744)

Refrigeration

Automatic control

Of external fluid or means

C062S183000, C062S228300, C062S229000

Reexamination Certificate

active

08037700

ABSTRACT:
An air conditioning system that comprises a controller that is in electrical communication with a compressor, a condenser fan, a temperature sensor that measures the temperature of the ambient air, a temperature sensor that measures the temperature of a condenser coil of the air conditioning system, and a low pressure switch (LPS) that measure the pressure of a refrigerant disposed within the air conditioning system. An algorithm resident on the controller controls the controller to enter a low ambient cooling mode when the temperature of the ambient air is less than a set temperature. The algorithm further controls the controller so that a minimum and/or maximum cycling frequency is imposed on the condenser fan. The algorithm further controls the controller so that the controller does not respond to an LPS trip during the early part of a cooling cycle under low outdoor temperature conditions, which might not accurately indicate a system fault, but still shuts down the compressor in response to an LPS trip under conditions that truly indicate a system fault.

REFERENCES:
patent: 4941325 (1990-07-01), Nuding
patent: 5291745 (1994-03-01), Hanson
patent: 6463747 (2002-10-01), Temple
patent: 6606872 (2003-08-01), Smith
patent: 1693797 (2005-11-01), None
International Search Report issued Nov. 19, 2007 for the corresponding international application PCT/US2007/001603.

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