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Full Description

ASHRAE Standard 40 provides test methods for determining the heating and cooling output capacities and energy inputs of unitary air-conditioning and heat pump equipment that is heat-operated.

The 2014 revision of Standard 40 includes the following changes:

  • The Scope in Section 2.3 was revised to remove specific mention ofreferences and to clarify the intended scope
  • The definition of "batch process" was revised to eliminate use of the term "cycle"
  • Definitions were added for "electrically driven unitary air conditioners or heat pumps" and "heat-operatedabsorption chillers." Definitions for "heat-operated" and "heat-operated unitary equipment" were revised
  • Definitions for "section" and "sorbent" were removed
  • The unit conversions for temperature in the definitions for "standard air" and "standard temperature" were corrected
  • Sections 4(c) and 4(d) were revised to improve clarity
  • The title of ASHRAE Standard 37 was corrected in 5. 1(d)
  • The capacity range of Sections 5.2.1, 5.2.2, and 14.1.2 was revised to more closely align with current industry classifications
  • Section 5.2.2.1 was revised for clarity
  • Section 5.2.3 was eliminated as it did not have enforceable requirements
  • Section 5.3.1.1 was revised to increase the allowable heating value range for natural gas
  • In Table 5.3.1 (previously Table I), the Sl units for heating value were corrected. The default heat value for natural gas was revised. The source reference was removed
  • The wording of Sections 6.1.2, 6.6.2.4, R.2, 9.2.3, 9.2.4, 10.3.2, 1 1.1.3, 1 1.2.4, and 12.1.4. 1 were revised to usc enforceable language
  • Section 6.1.3 was eliminated as it did not have enforceable requirements
  • The references in Section 6.5 were updated
  • The footnotes from Section 6.6 were revised to direct the user to the correct portion of the standard
  • Tables 1 0.3.2 (previously Table 4a and 4b) were relocated
  • In Section 9.5 .1, the definition of qthi was revised
  • The alternative requirements for airflow measurement in Section I 0 were clarified. Additional alternative requirements are contained in the new 12.3.4
  • Sections 1 0.4. 1, 1 0.4.2, and 1 0.4.3 were revised for clarity
  • The option to usc mercury-in-glass-thermometers in Section 12.1 .1 was removed
  • The section that was previously numbered 12.1.4.1 was eliminated
  • The suggested list of pressure measurement types was removed from Section 12.2.1
  • Section 14.1.l.h was revised to stipulate that it applied to electrical power
  • Section 16 references were updated and reorganized. References that arc not required for compliance with the standard were removed
  • Informative Annex A was revised to eliminate unnecessary material.
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    Document History

    1. ASHRAE 40-2014

      👀currently
      viewing


      Standard 40-2014 -- Methods of Testing for Rating Heat-Operated Unitary Air-Conditioning and Heat-Pump Equipment (ANSI Approved)

      • Most Recent
    2. ASHRAE 40-2002 (RA 2006)


      Standard 40-2002 (RA 2006) -- Methods of Testing for Rating Heat-Operated Unitary Air-Conditioning and Heat-Pump Equipment (ANSI approved)

      • Historical Version
    3. ASHRAE 40-2002


      Standard 40-2002 -- Methods of Testing for Rating Heat-Operated Unitary Air-Conditioning and Heat-Pump Equipment (ANSI Approved)

      • Historical Version
    4. ASHRAE 40-1980 (RA 92)


      Standard 40-1980 (RA 92) -- Methods of Testing for Rating Heat-Operated Unitary Air-Conditioning Equipment for Cooling

      • Historical Version