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 scopeThe 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 removedThe unit conversions for temperature in the definitions for "standard air" and "standard temperature" were correctedSections 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 classificationsSection 220.127.116.11 was revised for claritySection 5.2.3 was eliminated as it did not have enforceable requirementsSection 18.104.22.168 was revised to increase the allowable heating value range for natural gasIn 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 removedThe wording of Sections 6.1.2, 22.214.171.124, 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 languageSection 6.1.3 was eliminated as it did not have enforceable requirementsThe references in Section 6.5 were updatedThe footnotes from Section 6.6 were revised to direct the user to the correct portion of the standardTables 1 0.3.2 (previously Table 4a and 4b) were relocatedIn Section 9.5 .1, the definition of qthi was revisedThe alternative requirements for airflow measurement in Section I 0 were clarified. Additional alternative requirements are contained in the new 12.3.4Sections 1 0.4. 1, 1 0.4.2, and 1 0.4.3 were revised for clarityThe option to usc mercury-in-glass-thermometers in Section 12.1 .1 was removedThe section that was previously numbered 126.96.36.199 was eliminatedThe suggested list of pressure measurement types was removed from Section 12.2.1Section 14.1.l.h was revised to stipulate that it applied to electrical powerSection 16 references were updated and reorganized. References that arc not required for compliance with the standard were removedInformative Annex A was revised to eliminate unnecessary material.