This Standard applies to factory-manufactured residential, commercial, and industrial packaged terminal air-conditioners and heat pumps as defined in Clause 3.

This Standard applies to electrically operated vapour-compression refrigeration systems.

Packaged terminal air-conditioners and heat pumps are intended for unducted installation, but may be employed with ductwork having external static resistance up to 25 Pa (0.1 in H₂O).

This Standard does not apply to the following:

(a) heat-operated air-conditioning/heat pump equipment or room air-conditioners/heat pumps, as defined in CAN/CSA-C368.1;

(b) water-to-air and brine-to-air heat pumps, as defined in CAN/CSA-C13256-1 and ISO 13256-1;

(c) unitary air-conditioners and air-source unitary heat pumps, as defined in CAN/CSA-C273.3 and AHRI 210/240, with capacities less than 19 000 W (65 000 Btu/h);

(d) commercial and industrial unitary air-conditioners and heat pumps, as defined in CAN/CSA-C746 and AHRI 340/360, with capacities of 19 000 W (65 000 Btu/h) or greater;

(e) commercial and industrial single package vertical air-conditioners and heat pumps, as defined in AHRI 390, with capacities of 39 300 W (134 000 Btu/h) or less; and

(f) units with integral gas-fired heating.

In this Standard, "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; and "may" is used to express an option or that which is permissible within the limits of the standard. 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. Legends to equations and figures are considered requirements.

The values given in SI (metric) units are the standard. The values given in parentheses are for information only.