Code for the field approval of fuel-burning appliances and equipment

Note: The title, ICS code and scope of this Notice of Intent (originally published on March 3, 2020) was updated by the responsible SDO on March 26, 2024.

1.1 Inclusions

This Code contains the requirements for fuel-burning appliances and equipment located downstream of the manual shut-off valve specified in Clause 6.18.2 of CSA B149.1.

1.2 Exclusions

This Code does not apply to

a) installations in marine pipeline terminals;

b) gas where used as a feedstock in petroleum refineries or chemical plants;

c) gas designated for storage or handling, or both, at propane gas bulk plants;

d) gas where used for natural gas for vehicles;

e) a new appliance that is certified to an approved Standard;

f) a manually operated appliance with an input not exceeding 20 000 Btu/h (6 kW) used for industrial applications;

g) other fuels not covered in this Code and used in combination with gas; and

h) a certified appliance when changing the fuel type with a certified conversion kit for the appliance.

1.3 Fuel

When another fuel is used in the installation and in combination with gas, the safe operation of that fuel needs to be approved.

1.4 Application

Requirements contained in this Code apply only to that portion of an appliance using gas as defined in Clause 1.7, atmosphere gas, and reaction gas.

1.5 Types of appliances and controls

The requirements contained in this Code apply to

a)  an appliance that is not certified to an approved Standard;

b)  a previously certified or previously field-approved appliance where the certification or approval has been voided due to a modification of the appliance installation or control system; and

c) programmable logic controllers or microprocessor-based controls used for flame safety and fuel/air ratio control.

1.6 Hierarchy

 For an appliance for which there is an approved standard, the requirements in this Code may replace or supplement the requirements in an approved standard to achieve a field approval under this Code, with the permission of the authority having jurisdiction (AHJ).

1.7 Gas type

When the term “gas” is used, the requirements of this Code include, and apply equally to, any of the following gases or mixtures of them: natural gas, manufactured gas, propane, propane air, propylene, butane (normal butane or isobutane), butylene, hydrogen and hydrogen – natural gas blends.

1.8 Units of measure

The values given in yard/pound units are the standard. The values given in parentheses are for information only.

1.9 Biogas

When using digester gas, landfill gas or biogas, this Code is to be used in conjunction with CSA B149.6.

1.10 Terminology

In this Code, “shall” is used to express a requirement, i.e., a provision that the user is obliged to satisfy in order to comply with the Code; “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 Code.

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.