C748-13 (R2023)

Scope 1.1 Part 1 of this Standard covers heating and cooling systems that are generally referred to as "direct-expansion-to-air heat pumps" ("DX-to-air heat pumps"). These systems generally include an indoor coil with air-moving means, a compressor, and a refrigerant-to- earth heat exchanger. A system may provide both heating and cooling, cooling-only, or heating-only functions. 1.2 Part 1 of this Standard establishes performance testing and rating criteria for factory-made, electrically-driven, mechanical-compression type, DX-to-air heat pumps for residential, commercial and industrial use. The requirements for testing and rating contained in Part 1 of this Standard are based on the use of matched assemblies. 1.3 Part 1 of this Standard does not apply to the testing and rating of individual assemblies for separate use, nor to the testing and rating of heat pumps covered in ISO 5151 or ISO 13253. Note: In this Standard, the terms "equipment" or "heat pumps" may be used to mean "DX-to-air heat pumps". 1.4 The values given in SI units are the units of record for the purposes of this Standard. The values given in parentheses are for information and comparison only. 1.5 In CSA Standards, "shall" is used to express a requirement, i.e., a provision that the user is obliged to satisfy in order to comply with the standard; "should" is used to express a recommendation or that which is advised but not required; "may" is used to express an option or that which is permissible within the limits of the standard; and "can" is used to express possibility or capability. Notes accompanying clauses do not include requirements or alternative requirements; the purpose of a note accompanying a clause is to separate from the text explanatory or informative material. Notes to tables and figures are considered part of the table or figure and may be written as requirements. Annexes are designated normative (mandatory) or informative (non-mandatory) to define their application.