This document is intended for general information only. It is provided in good faith to interested parties. ENEFEN will not be
responsible for its suitability for any specific project or circumstance. The information provided represents ENEFEN’s opinion,
which may not necessarily be accepted by other Inspection Bodies (IBs) or Authorities Having Jurisdiction (AHJ). Reader is warned to use this information with caution.
Why does ENEFEN check burner length, position, mounting, supports, secondary air plate, combustion readings, etc?
CSA B149.3 Code section 5.6 requires that:
Construction of a burner and any component parts shall be in accordance with reasonable concepts ofsafety, substantiality, and durability.
A burner shall be of a design that is compatible with the intended application and shall incorporatefeatures that will ensure safe operation.
A burner shall be provided with a means to
(a) be firmly secured in place to maintain its correct position;
(b) prevent accidental movement of any adjustable part; and
(c) maintain complete and stable combustion under all operating conditions.
A burner shall maintain stability of the designed flame shape, with neither flashback nor blow-‐off, over theentire range of turndown that will be encountered during operation, when supplied with combustion airand the designed fuels in the proper proportions and in the proper pressure ranges.”
Consequently it is in our interpretation of the Code and of reasonable concepts of safety, suitability and durability that it is NOT OK to:
not support the burner or its pilot properly
let the burner or pilot be misaligned in the fire tube or furnace
allow flame to impinge on any surfaces which are not meant to be hit by flame including heat transfer area or any other appliance parts (such as outside part of the firetube)
allow burner to overheat and eventually crack supporting welds
burn paint off any part of the appliance
allow burner to lose flame stability at any part of its firing range, and especially its minimum or maximum fire
not be able to control the combustion air flow either in forced draft or natural draft designs
operate outside of its design pressure range between minimum and maximum fire
produce high CO, deposit carbon on heat exchanger or in the stack
result in excessive condensation and water collection inside the appliance without proper drainage
produce excessive noise, vibration, puffs (explosions), smoke, visible flame, excessive surface temperatures , etc, which may be unsafe or detrimental to the appliance itself, or to the process, personnel, public, or environment