View Access for this document is only available for viewers in Canada
This is the second edition of CSA C273.5, Installation of air source heat pumps and air conditioners. It supersedes the previous edition published in 1980. It covers installation of unitary, factory-assembled air conditioners and heat pumps (air sink and air source) up to 19 kW (65,000 Btu/h). It should be noted that this edition now includes requirements for air conditioners as well.
This Standard has been developed in compliance with Standards Council of Canada requirements for National Standards of Canada. It has been published as a National Standard of Canada by CSA Group.
This Standard covers the installation requirements for unitary air conditioners and air source heat pumps for residential applications with cooling ratings up to 19 kW (65 000 Btu/h).
This Standard covers installations in new construction and, where applicable, in installations that are part of an existing system.
This Standard covers equipment requirements, system design, equipment selection, minimum installation requirements, and information to be provided to the owner.
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.
The values given in SI (metric) units are the standard. The values given in parentheses are for information only.
An update to this product is available.
To receive notifications when an amendment, new edition or update is available to your standard no matter how you purchased it, please register on the Standards Update Service. After registering, enter the List ID for the relevant standard. The List ID can be found in the “CSA Standards Update” section within the first few pages of the standard you’ve purchased. Once notified, you can then update your standard accordingly.
PDF Format Purchased from the CSA Store
If you have purchased or subscribed to a standard from the CSA Store in PDF format, login to your CSA OnDemandTM account to access the updated PDF.
Paper Format Purchased or Purchased from Reseller
If you have purchased a paper copy of the standard from the CSA Store or purchased a standard in paper or PDF format from one of our resellers, login to the Standards Update Service to download the updates in PDF format.
eBook Format Purchased
If you have purchased a standard in eBook format, login to the CSA Reader App to download the updated version of the standard.