CSA C273.5-11:2020 pdf download.Installation of air source heat pumps and air conditioners
1.4 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; 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.
Annexes are designated normative (mandatory) or informative (nonmandatory) to define their application.
3 Definitions
The following definitions apply in this Standard.
AHRI certified reference number一a unique number assigned by the Air-Conditioning, Heating, and Refrigeration Institute (AHRI) to a combination of outdoor and indoor unit model numbers and the certified performance of that combination at standard rating conditions.
Balance point一the outdoor temperature below which the heat pump cannot supply the total heating requirements of the structure.
Central-ducted air conditioner or heat pump一a device for circulating, filtering, cooling, and/or heating air of a whole house via a central ducting system that consists of one or more factory-made assemblies that normally include an indoor conditioning coil, evaporator or cooling coil, a compressor,and an outdoor coil or condenser with controls for automatic cooling or heating, or both.
Cut-off一an adjustable thermostatic device (typical on dual fuel applications) that senses outdoor temperature and can be set to turn off the heat pump.
Ductless air conditioner or heat pump一a device for circulating, filtering, cooling, and/or heating air of a specific area or areas of a house by providing air directly into the area or areas without the use of a ducting system and that consists of one or more factory-made assemblies that normally include an indoor conditioning coil, evaporator or cooling coil, a compressor, and an outdoor coil or condenser with controls for automatic cooling or heating, or both.
Mini-ducted air conditioner or heat pump一a device for circulating, filtering, cooling, and/or heating air of a specific area or areas of a house via a dedicated, non-central ducting system that consists of one or more factory-made assemblies that normally include an indoor conditioning coil, evaporator or cooling coil, a compressor, and an outdoor coil or condenser with controls for automatic cooling or heating, or both.CSA C273.5-11 pdf download.