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ASHRAE Standard 127-2020 - Method of Testing for Rating Air-Conditioning Units Serving Data Center (DC) and Other Information Technology Equipment (ITE) Spaces (ANSI Approved), 2020
- ANSI/ASHRAE Standard 127-2020 [Go to Page]
- CONTENTS
- FOREWORD
- 1. PURPOSE
- 2. SCOPE [Go to Page]
- 2.1 This standard applies to classes of air-conditioning units that are used to air condition data center (DC) and other information technology equipment (ITE) spaces. Such units must be able to be tested using an air enthalpy method and facilitate h...
- 2.2 Exclusions
- 3. DEFINITIONS
- 4. CLASSIFICATION [Go to Page]
- 4.1 Normally, computer and data processing room air-conditioner (CDPR) units within the scope of this standard can be classified as shown below. There are eight basic types of air conditioners:
- 5. RATING REQUIREMENTS [Go to Page]
- 5.1 Cooling System Standard Capacity Ratings. Standard cooling capacity is defined as 100% of the unit’s full capacity and is sometimes referred to as “standard rating.” Standard rating capacity shall be established at the standard rating condi...
- 5.2 Unit Efficiency Calculations
- 5.3 Part-Load Ratings. Part-load ratings may be included as application ratings at the manufacturer’s option.
- 5.4 Reheating System Standard Ratings. Standard ratings shall be established at the rating conditions specified in Informative Appendix F. Reheating tests are conducted without operating the cooling or humidifying portions of the air conditioner. Ope...
- 5.5 Humidification and Dehumidification System Standard Ratings. Standard ratings shall be established at the rating conditions specified in Informative Appendix F.
- 5.6 Air Filter Standard Ratings. Published air filter ratings shall be those defined in ASHRAE Standard 52.2 7. At any test condition described by this standard, the system shall be tested with clean filters of the manufacturer’s choice. Optional f...
- 5.7 Application Ratings. In addition to capacity ratings and iNSenCOP values at conditions of temperature, humidity, or altitude other than those specified in Section 5.1, application ratings may be published and shall be based on calculations or tes...
- 5.8 Publication of Ratings. Wherever application ratings are published or printed, they shall include or be accompanied by the standard rating. Application ratings shall be clearly designated as such, including a statement of the conditions at which ...
- 5.9 Method for the Measurement and Designation of Noise Emitted by CDPRs. This section specifies the requirement for publishing sound power levels. One, two, or three measurement positions are required for each unit, depending on the unit configurati...
- 5.10 Capacity Designation. For air conditioners rated under this standard, the cooling system and dehumidification system capacity designations used in published specifications, literature, or advertising controlled by the manufacturer shall be expre...
- 5.11 Tolerances. To comply with this standard, published cooling capacity ratings and power ratings shall be based on data obtained in accordance with the provision of this section and shall be such that any production unit, when tested, will meet th...
- 6. CONFORMANCE
- 7. REFERENCES
- NORMATIVE APPENDIX A: TEST DUCTS FOR MEASURING AIRFLOW RATE AND STATIC PRESSURE ON ALL DOWNFLOW UNITS AND THOSE UPFLOW UNITS IN LIMITED-HEIGHT TEST CHAMBER
- NORMATIVE APPENDIX B: CLIMATE ZONE BIN DATA WITH POPULATION WEIGHTING
- NORMATIVE APPENDIX C: TEST SETUP PACKAGED AHU FOR OUTDOOR INSTALLATION
- NORMATIVE APPENDIX D: TEST SETUP REAR DOOR HEAT EXCHANGER
- NORMATIVE APPENDIX E: SYSTEM CONFIGURATION
- INFORMATIVE APPENDIX F: PERFORMANCE RATING TABLE FROM AHRI 1360 [Go to Page]
