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ANSI/ASHRAE Standard 37-2009

Methods of Testing for Rating Electrically Driven Unitary Air-Conditioning and Heat Pump Equipment

Applies to electrically driven mechanical-compression unitary air conditioners and heat pumps consisting of one or more assemblies that include an indoor air coil (s), a compressor(s), and an outdoor coil(s). Where such equipment is provided in more than one assembly, the separated assemblies are designed to be used together. This standard does not include methods of testing the following: cooling coils for separate use; condensing units for separate use; room air conditioners; heat-operated unitary equipment; liquid chilling packages; multiple indoor air coils operating simultaneously in heating and cooling modes.

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American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc. [ASHRAE]


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As the voice of the U.S. standards and conformity assessment system, the American National Standards Institute (ANSI) empowers its members and constituents to strengthen the U.S. marketplace position in the global economy while helping to assure the safety and health of consumers and the protection of the environment.

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