Performance of Integrated Mechanical Systems for Residential Heating and Ventilation

1.1 This Standard describes the test procedures, apparatus, and calculations required to determine the performance, capacities, energy consumption, and overall efficiency of residential gas-fired integrated mechanical systems that perform all of the following functions: (a) space heating; (b) potable water heating; (c) ventilation with heat recovery; and (d) air circulation and distribution of fresh air. Note: For the purposes of this Standard, integrated mechanical systems are divided into three types (see Clause 6.1.2).

1.2 This Standard establishes laboratory methods for testing and rating the overall thermal and electrical performance of an integrated mechanical system (IMS) using a consistent test set-up and ambient temperature.

1.3 IMS performance is characterized by two performance descriptors that consolidate measurements for each operating mode to provide annual thermal and electrical performance ratings. The ventilation and water heating loads that are incorporated into the overall ratings are standardized, whereas the space heating loads that are incorporated into the overall ratings are based on the space heating capacity of the individual IMS.

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; "may" is used to express an option or that which is permissible within the limits of the Standard; and "can" is used to express possibility or capability. 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 (non-mandatory) to define their application.

1.5 The values given in SI (metric) units are the standard. The U.S. customary values in parentheses are for information only and are approximate in some cases