CODES

ADOPTS WITH AMENDMENTS:

International Mechanical Code 2012 (IMC 2012)

Chapter 16 governs the installation, testing, or repair of: oil or liquid fuel burners, oil or liquid fuel burning systems, oil or liquid fuel burning equipment, and the oil or liquid fuel piping systems installed within, or in conjunction with, buildings or structures. The requirements of this chapter shall apply to the following equipment:

1. Equipment utilized to provide control of environmental conditions.

Exception: Equipment and appliances listed and labeled to an appropriate standard by a nationally recognized testing laboratory, which is qualified to evaluate the equipment or appliance, when installed and tested according to the manufacturer’s installation instructions.

2. Equipment with a fuel input of 1,000,000 Btu/hr or greater.

3. Unlisted equipment.

4. Miscellaneous equipment when required by the building official.

After completion of all installations, the installer shall test all safety and operating controls and venting before placing the burner in service. The correct input of liquid fuel shall be determined and the fuel-to-air ratio set. Each oil or liquid fuel burner shall be adjusted to its proper input according to the manufacturer’s instructions. Overrating the burners or the appliance is prohibited. The input range shall be appropriate to the appliance.

1. For conversion burners installed in hot water (liquid) boilers or warm air furnaces, the rate of flow of the oil or liquid fuel in Btu/h shall be adjusted to within plus or minus five percent of the design load, and not to exceed the design rate of the appliance.

2. For conversion burners installed in steam boilers, the oil or liquid fuel hourly input demand shall be adjusted to meet the steam load requirements. The oil or liquid fuel input demand necessitated by an oversized boiler shall be established and added to the input demand for load requirements to arrive at a total input demand.

Igniter or pilot flames shall be effective to ignite the oil or liquid fuel at the main burner or burners and shall be adequately protected from drafts. Pilot flames shall not become extinguished during the pilot cycle when the main burner or burners are turned on or off in a normal manner either manually or by automatic controls.
In making tests to determine compliance with the requirements of this section, care shall be exercised to prevent the accumulation of unburned liquid fuel in the appliance that might result in an explosion or fire.

1. The flames from the burner shall freely ignite the liquid fuel when operating at the lowest firing position.

2. Burner flames shall not flash back when the liquid fuel is turned on or off by an automatic control mechanism.

3. Main burner flames shall ignite freely from the pilot when the pilot flame is reduced to a minimum point that will actuate the pilot safety device.

4. When ignition is made in a normal manner, the flame shall not flash outside the appliance.

5. Burners shall not expel liquid fuel through air openings when operating at prevailing pressure.

6. Burners shall have a proper liquid fuel air mixture to ensure smooth ignition of the main burner.

1. Operational checking. The flue gas, venting, safety, and operating controls of the appliance shall be checked to ensure proper and safe operation.

2. Method of test – atmospheric type/induced draft type/fan assisted types. The appliance shall be allowed to operate until the stack temperature becomes stabilized after which a sample of the undiluted flue products shall be taken from the appliance flue outlet. The sample taken shall be analyzed for carbon monoxide, carbon dioxide, and oxygen. Stack temperature shall be noted.

Note: Appliance designs incorporating induced draft assemblies may require a flue gas sample to be taken after the draft regulator or induced draft fan.

3. Performance standards for atmospheric type.

a. Minimum of 75 percent efficiency as determined by flue gas analysis method at appliance flue outlet.

b. Carbon monoxide concentration in flue gas not greater than 0.04 percent.

c. Stack temperature not greater than 700°F (371°C), plus ambient.

d. Carbon dioxide concentration between 8 and 13 percent, inclusive.

e. Oxygen concentration between 4 and 10 percent, inclusive.

f. Smoke test no higher than #2 for light oils, or #4 for oils heavier than #4.

g. Draft shall be in accordance with burner manufacturer’s specifications.

3a. Performance standards for induced draft type/fan assisted types.

a. Minimum of 75 percent efficiency as determined by flue gas analysis method at appliance flue outlet.

b. Carbon monoxide concentration in flue gas not greater than 0.04 percent.

c. Stack temperature not greater than 700°F (371°C), plus ambient.

d. Carbon dioxide concentration between 8 and 13 percent, inclusive.

e. Oxygen concentration between 4 and 10 percent, inclusive.

f. Smoke test no higher than #2 for light oils, or #4 for oils heavier than #4.

g. Draft shall be in accordance with burner manufacturer’s specifications.

Note: Induced draft and fan assisted types of appliances may require a sample to be taken after the induced draft fan, which may cause oxygen figures in excess of the limits stated. In such cases, safe liquid fuel combustion ratios shall be maintained and be consistent with appliance listing.

4. Method of test – power type. The appliance shall be allowed to operate until the stack temperature becomes stabilized after which a sample of the undiluted flue products shall be taken from the appliance flue outlet. The sample shall be analyzed for carbon monoxide, carbon dioxide, and oxygen. Stack temperature shall be recorded.

5. Performance standards for power type.

a. Minimum of 80 percent efficiency as determined by flue gas analysis method at appliance flue outlet.

b. Carbon monoxide concentration in the flue gas not greater than 0.04 percent.

c. Stack temperature not greater than 700°F (371°C), plus ambient.

d. Carbon dioxide concentration between 8 and 13 percent, inclusive.

e. Oxygen concentration between 4 and 10 percent, inclusive.

f. Smoke test no higher than #2 for light oils, or #4 for oils heavier than #4.

g. Draft shall be in accordance with burner manufacturer’s specifications.

6. Test records filing; tag. After completion of the test of newly installed oil or liquid fuel burner equipment as provided in this section, complete test records shall be filed with the building official on an approved form. The tag stating the date of the test and the name of the installer shall be attached to the appliance at the main valve.

7. Oxygen concentration.

a. The concentration of oxygen in the undiluted flue products of oil or liquid fuel burners shall in no case be less than 3 percent nor more than 10 percent, shall be in conformance with applicable performance standards and shall be consistent with the appliance listing.

b. The allowable limit of carbon monoxide shall not exceed 0.04 percent.

c. The flue gas temperature of an oil appliance, as taken on the appliance side of the draft regulator, shall not exceed applicable performance standards and shall be consistent with the appliance listing.

8. Approved oxygen trim system. The oxygen figures may not apply when there is an approved oxygen trim system on the burner that is designed for that use, including a low oxygen interlock when approved by the building official.

9. Supervised start-up.

a. Supervised start-up may be required to verify safe operation of oil or liquid fuel burner and to provide documentation that operation is consistent with this code, listing and approval. Supervised start-up is required for all liquid fuel burners listed in b, c, and d. Supervised start-up requires that the liquid fuel burner shall be tested in the presence of the building official in an approved manner. Testing shall include safety and operating controls, input, flue gas analysis, and venting. Flue gas shall be tested at high, medium, and low fires. Provisions shall be made in the system to allow firing test in warm weather. After completion of the test of newly installed oil or liquid fuel burner equipment as provided in this section, complete test records shall be filed with the building official on an approved form. The tag stating the date of the test and the name of the installer shall be attached to the appliance at the main valve.

b. Oil and liquid fuel burners of 1,000,000 Btu/hr input or more require a supervised start-up as in a.

c. Installation of oxygen trim systems, modulating dampers, or other draft control or combustion devices require a supervised start-up as in a.

d. All direct fired heaters require a supervised start-up as in a.

10. Control diagram. A complete control diagram of the installation and suitable operating instructions shall be supplied to the building official.

A. All installations of gas or fuel burners with input above 400,000 Btu/hr and all combination gas or fuel burners must be approved before installation. The following information must be supplied as required by the building official.

1. Name, model, and serial number of the burner.

2. Input rating and type of fuel.

3. Name of the nationally recognized testing laboratory that tested and listed the unit.

4. Name, model, and serial number of the furnace or boiler that the burner will be installed in if not part of a complete package.

5. A complete wiring diagram showing the factory and fuel wiring installed or to be installed including all controls, identified by the brand name and model number.

6. A print of the gas or fuel train from the manual shutoff to the appliance showing all controls that will be installed, their names, model numbers, and approvals.

B. All installations of gas or fuel burners with input above 400,000 Btu/hr and all combination gas and oil or other combination fuel burners that are installed in new or renovated boiler or equipment rooms, or are installed in a package with the boiler or furnace, shall include the following information in addition to that required in Item A, subitems 1 to 6.

1. A complete piping diagram from the supply source showing all components and materials identified by brand name and model number with relevant approvals.

2. Detailed provisions for combustion air, venting, and stacks.

3. A floor plan drawn to scale showing all relevant equipment. Plans and specifications shall be approved before proceeding with an installation.

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