scope:

This Standard provides requirements for rating, performance, and tests of all sizes of factoryassembled packaged terminal air-conditioners and heat pumps (as defined in Clause 2.1) intended for use in residential, commercial, and industrial heating and cooling systems.

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

This Standard does not apply to room air-conditioners, room fan-coil air-conditioners, watersource heat pumps, or unitary single packaged air-conditioners and heat pumps. 

The primary unit values given are in SI (metric) units. The values given in parentheses are in foot-pound units.

Where used in this Standard, "shall", "should", "recommended", and "may" shall be interpreted as follows:

shall -where "shall" or "shall not" is used for a provision specified, that provision is mandatory if compliance with the Standard is claimed.

should, recommend - are used to indicate provisions that are not mandatory, but are desirable as good practice.

may - is used to indicate provisions that are optional at the discretion of the manufacturer