March 15, 2011
SUMMARY OF REQUIREMENTS
The following is a brief summary of the new and revised paragraphs in the Standard for Atomizing-Type Oil Burners, CSA B140.2.1, which have a future Effective Date of September 1, 2012 and the action that may be required to determine compliance.
Paragraphs / General Subject and Comment /5.11.1.5 / Oil burners having an input in excess of 11.4 L/h (3 gph) shall be provided with two oil safety shut-off valves or one safety shut-off valve with a nozzle cut-off valve.
Current Certification Issue: Ensure burner is equipped with two electric oil safety shut-off valves or one electric oil safety shut-off valve and one mechanical nozzle cut-off valve suitable for the application and describe accordingly in Report.
5.11.1.6 / Oil burners with an input in excess 340 L/h (90 gph) shall be equipped with proof-of-closure switches on each valve and a means of relieving excess pressure that can develop between the valves due to ambient temperature rise.
Current Certification Issue: Ensure each electric oil safety shut-off valve is equipped with a proof-of-closure switch and describe the method of relieving excess pressure accordingly in the Report.
5.11.4 / A burner shall be provided with a means for obtaining a pre-purge cycle on every start and a positive shut-off at every stop equivalent to that attained with a solenoid valve. Electric solenoid valves, when used, shall be suitable for the application. The designed working pressure of the valve shall be not less than the max operating pressure.
Current Certification Issue: Ensure burner is provided with a primary safety control that provides a pre-purge cycle upon start-up and positive shutoff of the oil supply at the end of the firing cycle, describe according in Report.
5.11.5 / An appropriate relief valve shall be provided for viscosity compensating devices. The valve shall operate at less than the pressure that would create an unsafe condition.
Current Certification Issue: For viscosity compensating devices, ensure they are provided with a relief valve suitable for the application.
5.12.24 / When the fuel pump is separate from the burner motor and the burner has an input in excess of 75 L/h (20 gph), a low pressure fuel oil control shall be installed to shut down the burner in the event of low pressure in the fuel oil supply system.
Current Certification Issue: As a similar requirement is included in UL 296, Tenth Edition, Clause 11.13, this should be non-issue for cUL Listings.
5.13.2.6 / Atomizing nozzles up to 11.4 L/h (3 gph) capacity, designed to be interchangeable, shall not exceed 12.5 +/-1.6 mm (1/2 +/- 1/16 in.) in length, as measured from orifice tip to the shoulder.
Current Certification Issue: Ensure nozzles do not exceed 1/2 +/- 1/16 in and describe accordingly in Report.
Paragraphs / General Subject and Comment
5.15.2.6 / Burners having a capacity greater than 11.4 L/h (3 gph) shall be provided with a control to ensure a post-purge of at least 15s after a flame failure occurs.
Current Certification Issue: UL 296, Tenth Edition, Sec. 12 does not require post-purge on units less than 15 gph. Ensure cUL units over 3 gph are provided with a primary safety control that provides a post-purge cycle at the end of the firing cycle and describe accordingly in Report.
6.10.2 / A plus-factory tolerance on the nominal timings specified in Table 2 shall be as follows: a) 10% of the nominal timing from nominal timings of 15s or more; and b) 1s for nominal timings of less than 15s.
Current Certification Issue: No issue, test data sheets will be revised accordingly.
6.10.7 / The flame failure response time shall not exceed 4 min, except as specified in Clause 6.10.8, in a burner having a firing rate of 11.45 L/h (3 gph) or less, with the control operating at 84V (on a control rated at 120V).
Current Certification Issue: This may be an issue if a burner is not provided with a primary safety control. Testing to ensure the FFRT on a burner rated less than or equal to 3 gph does not exceed 4 minutes at undervoltage conditions (84V on a 120V control) is considered appropriate to verify conformance with this requirement.
7.2 / The equipment shall be plainly marked in a permanent manner with the following details:
a) Manf. Name, tradename, or other rec’d symbol of ID.
b) Model or type designation
c) Approved range of firing rate (except when burner is incorporated into a packaged unit.
d) For units with pressure nozzles: max input marking should agree with the rated capacity of the nozzle. When the max input does not agree with the rated capacity of the nozzle, both the rated nozzle size and the required pump pressure to obtain the max. input in applicable units shall be marked in addition to the max input.
e) Electrical rating, when applicable, as specified in C22.2 No. 3
f) Heaviest grade of fuel oil recommended.
Current Certification Issue: Ensure nameplate markings comply with the above requirements and described accordingly in Report.