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ASHRAE Standard 127 - Method of Testing for Rating Computer and Data Processing Room Unitary Air Conditioners, 2012
- FOREWORD [Go to Page]
- Definitions
- Rating Requirements
- 1. PURPOSE
- 2. SCOPE
- 3. DEFINITIONS
- 4. CLASSIFICATION
- 4.1 Normally, CDPR units within the scope of this standard can be classified as shown below. There are five basic types of unitary air conditioners:
- 5. RATING REQUIREMENTS
- 5.1 Cooling System Standard Capacity Ratings. Rated cooling is defined as 100% of the unit's max capacity and is sometimes referred to as standard rating. Standard rating capacity shall be established at the standard rating conditions specified in ...
- 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 Table 1. Reheating tests are conducted without operating the cooling or humidifying portions of the air conditioner. Operations in a re...
- 5.5 Humidification and Dehumidification System Standard Ratings. Standard ratings shall be established at the rating conditions specified in Table 1.
- 5.6 Air Filter Standard Ratings. Published air filter ratings shall be those defined in ASHRAE Standard 52.2.5 At any test condition described by this standard, the system shall be tested with clean filters of the manufacturer's choice. Optional fi...
- 5.7 Application Ratings. Capacity ratings and iNSenCOP values at conditions of temperature, humidity, or altitude other than those specified in Section 5.1.4 may be published as application ratings and shall be based on calculations or tests using te...
- 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. Two or three measurement positions are required for each unit depending on the unit configuration as s...
- 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 Annex A— Tests Required
- A1. Air-Cooled Units
- A1.1 Cooling capacity at condition Rated Cooling A in Table 1
- A1.2 Unit efficiency test at conditions Rated Cooling A, B, C, and D in Table 1
- A1.3 Dehumidification capacity test
- A1.4 Humidification capacity test
- A2. Water-Cooled Units
- A2.1 Cooling capacity at condition Rated Cooling A in Table 1
- A2.2 Unit efficiency test at conditions Rated Cooling A, B, C, and D in Table 1
- A2.3 Dehumidification capacity test
- A2.4 Humidification capacity test
- A3. Glycol-Cooled Units
- A3.1 Cooling capacity at condition Rated Cooling A in Table 1
- A3.2 Unit efficiency test at conditions Rated Cooling A, B, C, and D in Table 1
- A3.3 Dehumidification capacity test
- A3.4 Humidification capacity test
- A4. Chilled-Water Units
- A4.1 Cooling capacity at condition Rated Cooling A in Table 1
- A4.2 Unit efficiency test at conditions Rated Cooling A, B, C, and D in Table 1
- A4.3 Dehumidification capacity test
- A4.4 Humidification capacity test
- Normative Annex B— test procedure for measuring Airflow and Static Pressure ON DownFlow Units
- (This is a normative annex and is part of this standard.)
- Normative Annex C— Climate Zone Bin Data with Population Weighting
- Informative Annex D Comparison of Test Results (Simulated) [Go to Page]