CAN/CSA-C273.3-M91 (R2001)

1. Scope 1.1 This Standard applies to factory-made, air-source, air- sink, split-system, unitary air-conditioners and heat pumps, matching assemblies of the type classified in Clause 1.4, intended for air-conditioning and heating applications in buildings. 1.2 This Standard applies only to electrically driven, mechanical, vapour-compression-type systems charged with one of the refrigerants listed in Group 1 of CSA Standard B52, Mechanical Refrigeration Code. 1.3 This Standard covers equipment rated below 19.0 kW (65,000 Btu/h) heating or cooling at standard rating conditions as listed in Clause 7.2. 1.4 Unitary equipment within the scope of this Standard is classified as follows: Unitary air-conditioners, Unitary heat pumps; Designation, ARI classification. 1.5 This Standard does not apply to burner-assisted air-source heat pumps or to air-source, air-sink multifunction, or integrated vapour-compression-type heat pump systems. 1.6 The values given in SI (metric) units are the standard. The values given in parentheses are for information only.