Safeguarding Persons and Property and Promoting the Welfare of the Public; Creating the Office Warm Air Heating etc.

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page 5. installed in accordance therewith on all oil fired steam boilers. 5,. Limit Control & Low ?Water Fuel Cutoff in Main Circuit. Limitr Controls and low water fuel cutoffs which, by operating, interrupt. the electric power supply to the burner shall be so arranged as to open the main line current supply to the burner, whether the switch - ing is integral with the sensing element or remote from same. 6. Combustion Air - Oil Interlock. In installations equipped with forced or induced draft fans, or both, approved means shall be provided to immediately shut off the oil supply upon air supply failure. Controls actuated by failure of the power supply to the blower motor do not meet this requirement. This does not apply to heat vaporization burners listed by Underwriters' Laboratories, Inc. 7, Grade of Fuel Oil. The grade of fuel oil used with any burner shall be one which tests and experience show to be suitable for use with that burner. The oil shall have a flash point not less than 11OF when tested by the Pensky - Martins Closed Cup Testing Method, and shall be free from acid, grit and-fibrous or other foreign matter likely to clog or injure the burners or valves. 8. Fuel for Gas Pilot. The use of any fuel other than natural gas in the gas pilot of any fuel oil burner is prohibited without special permis- sion of the Department. 9. Gas Pilot Piping. Gas pilot supply piping shall be provided with an approved shut -off valve near the pilot burner, with an approved properly vented gas pressure regulator and shall conform with Article %II on gas piping. 10. Ventilation of Trapped Vapors. Ventilation shall be provided to pre- vent the accumulation of any trapped vapors below the combustion chamber. 11. Oil Preheaters.. Preheating of oil, where necessary, shall be done by steam, hot watery or approved electric heaters. Heaters shall be substantially constructed with all joints made oil tight. Thermostats shall be installed at suitable locations to indicate the temperature of the heated oil. Heaters shall be by- passed or provided with suitable means to prevent abnormal pressure. Means shall be provided to prevent introduction of oil or other liquid harmful to boiler operation into the boiler. 12. Oil Strainers. Oil supply lines to burners shall be provided with approved strainers. SECTION 8. LICENSES REQUIRED. Except as otherwise provided in Section One (1), no person, firm or corporation shall in any manner undertake to execute or perform any work of installing, maintaining, or altering or repairing any warm air heating, residential air conditioning or ventilating equipment or system unless such person, firm or corporation is the holder of a Class A Warm Air Heating, Residential Air Conditioning or Ventilating Contractor's License as defined, and has a certificate therefore as provided for in Section Nine (9) of this Ordinance; nor shall any person, firm or corporation execute or perform such work otherwise than as specifically permitted under the class of license held by such person, firm or corporation except that such provision shall not apply to any person employed by and working under the direction of a holder of a Class A ?Warm Air Heating, Residential Air Conditioning and Ventilating Contractor's License. SECTION 9. CLASSES OF LICENSES. Four (4) classes of licenses and certificates which shall be known respectively as Class A: Warm lair Heating, Residential Air Conditioning and Ventilating Dealer License; Class B: for the sale and installation of conversion burners in existing furnaces; Class C: Journey men Warm