Minnesota Legislature
Office of the Revisor of Statutes
Minnesota Administrative Rules
1346.5905 SECTION 905 (IFGC) METHOD OF TEST.
The IFGC is amended by adding a section to read as follows:
SECTION 905
METHOD OF TEST
905.1 Method of test.
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 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 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.
3.1. 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 on an air-free basis.
c. Stack temperature not greater than 480°F, plus ambient.
d. Carbon dioxide concentration between 6 and 9 percent, inclusive.
e. Oxygen concentration between 4 and 10 percent, inclusive.
3.2. Performance standards for induced draft type/fan-assisted 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 on an air free basis.
c. Stack temperature not greater than 480°F, plus ambient.
d. Oxygen concentration between 4 and 10 percent, inclusive, with carbon dioxide concentration between 6 and 9 percent, inclusive.
Note: Induced draft type and fan-assisted type appliances may require a sample to be taken after the induced draft fan, which may cause oxygen figures in excess of limits stated. In such cases, safe 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 method at appliance flue outlet.
b. Carbon monoxide concentration in flue gas not greater than 0.04 percent.
c. Stack temperature not greater than 480°F plus ambient, or 125°F in excess of fluid temperature plus ambient.
d. Carbon dioxide concentration between 6 and 9 percent, inclusive.
e. Oxygen concentration between 3 and 10 percent, inclusive.
6. After completion of the test of newly installed gas or 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 gas or 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 a gas 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. The building official shall consider whether an exception will provide equivalent safety.
9. Supervised start-up.
a. Supervised start-up may be required to verify safe operation of gas or fuel burner and to provide documentation that operation is consistent with this code, listing and approval. Supervised start-up is required for all fuel burners in b, c, and d. Supervised start-up requires that fuel burners 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 gas or 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. Gas and 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. A complete control diagram of the installation and suitable operating instructions shall be supplied to the building official.
History:
29 SR 299; L 2007 c 140 art 4 s 61; art 13 s 4; 34 SR 537
Published Electronically:
October 23, 2009
Official Publication of the State of Minnesota
Revisor of Statutes