Preface 

This is the third edition of CSA B140.7, Oil-fired steam and hot-water boilers . It supersedes the previous edition, published in 2005 under title Oil-burning equipment: Steam and hot-water boilers. The 2005 edition combined and replaced CSA B140.7.1-1976, Oil-Fired Steam and Hot-Water Boilers for Residential Use, and CSA B140.7.2-1967, Oil-Fired Steam and Hot-Water Boilers for Commercial and Industrial Use. CSA B140.7.1 and CSA B140.7.2, along with CSA B140.12, Service Water Heaters for Domestic Hot Water, Space Heating, and Swimming Pools, replaced the first edition of CSA B140.7, Oil-Fired Steam and Hot-Water Boilers and Service Water Heaters, published in 1962. CSA B140.7 is one of a series of oil-burning equipment Standards providing minimum requirements for the safe operation, acceptable performance, design, construction, manufacture, marking, and testing of oil-burning equipment. It should be read in conjunction with CSA B140.0, Oil-burning equipment: General requirements. The major changes in this edition include the following: a) The title has been changed from Oil-burning equipment: Steam and hot-water boilers to Oil-fired steam and hot-water boilers. b) The scope has been changed to include direct vented and condensing boilers (Clause 1.1). c) Reference publications have been updated (Clause 2). d) All definitions have been deleted, and a reference has been inserted to redirect users to the definitions in CSA B140.0 (Clause 3). e) The requirement for electrical features has been removed because it is covered in CSA B140.0. f) General requirements have been added for condensing boilers (Clause 4.4). g) A new requirement has been added requiring appliances tested for use with biodiesel content in excess of 5% to have the burner and the fuel-delivery system components acceptable to the certification body for the blend specified (Clause 4.7). h) The specific requirements for the pressure vessel section of the boiler have been replaced with a general requirement that they need to be acceptable to the certification body in accordance with the applicable codes (Clause 5.1). i) The nomenclature for expressing input rate for the boiler has been changed from volume flow per hour to energy input per hour throughout the Standard. j) Clarification for the suitability of metal combustion chambers has been provided (Clause 5.11.3). k) Guidance has been provided when stating the input rate and other information on markings when acceptable to the certification body for use with biodiesel blends and No. 1 (kerosene) oil (Clause 6.1.2). l) Guidance has been provided when stating the input rate and other information in the installation and service manual when acceptable to the certification body for use with biodiesel blends and No. 1 (kerosene) oil (Clause 7.2). m) The information required in the installation and service manual has been updated to match the various changes in the Standard (Clause 7.2). n) The information required in operating instructions and homeowner instruction has been updated to match the various changes in the Standard (Clause 7.3). o) Guidance has been added for testing when the boiler is acceptable to the certification body for use with biodiesel blends (Clauses 8.1). p) The maximum smoke limits have been included in this Standard. Previously they were deferred to the applicable installation code (Clause 8.2.1.2). q) The maximum flue temperature has been modified to include condensing boilers (Clause 8.2.1.3). r) Requirements have been added when testing with biodiesel content in excess of 5% (Clause 8.2.2.7). s) The maximum flue loss of 20%s has been removed (formerly Clause 8.3.1.2). t) When conducting the test for rated output capacity, the water inlet temperature has been specified for condensing boilers (Clause 8.3.2.4). u) The notes in Clause 8.3.3.1have been removed (formerly Clause 7.3.3.1). v) Test requirements for "Proof test for steel boilers" have been deleted (formerly Clause 7.15). w) Test requirements for "Bursting test for cast iron boilers" have been deleted (formerly Clause 7.16). x) Requirements to investigate the effects for a system blockage on the condensate removal system have been added (Clause 8.15.1). y) A manual reset temperature limit has been added to protect polymeric materials on the flue passageway for condensing appliances (Clause 8.15.2). This Standard is considered suitable for use for conformity assessment within the stated scope of the Standard. This Standard was prepared by the Technical Committee on Oil-Burning Appliance Standards, under the jurisdiction of the Strategic Steering Committee on Fuels and Appliances, and has been formally approved by the Technical Committee. 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. 

Scope 

1.1 Application This Standard applies to a) complete vent (flue) -connected or direct-vent connected, oil-fired steam, and hot-water boilers that are provided with automatic control devices; b) oil-fired steam and hot-water condensing boilers; c) boilers having an input of less than 117.2 kW (400 000 Btu/h); d) low-pressure boilers (as defined in Clause 3) having an input of 117.2 kW (400 000 Btu/h) or more; e) high-pressure boilers (as defined in Clause 3), regardless of input; f) boilers, factory- or field-assembled, that have been, or could have been, completely assembled at the manufacturer's plant and transported in the assembled condition; g) boilers intended for heating swimming pool water (see Clause 4.6); and h) oil-fired boilers that i) include gas-fired pilots and have an input of 117.2 kW (400 000 Btu/h) or more; or ii) are capable of burning additional fuels. 

1.2 Exception This Standard does not cover the devices required on the gas train of the boilers described in Clause 1.1h), or other devices required for additional fuels. 

1.3 Non-compliance An appliance that differs from those specified by this Standard may be examined and tested according to the intent of this Standard. However, an appliance that otherwise complies with the requirements of this Standard will not be deemed as complying with this Standard if it has other features or a combination of features that, when examined and tested, are found to impair its fulfillment of the requirements. 

1.4 Terminology 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 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 (non-mandatory) to define their application. 

1.5 Units of measurement The values given in SI units are the units of record for the purposes of this Standard. The values given in parentheses are for information and comparison only.