Heating & Air Conditioning Requirements

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Mechanical System Requirements

Additions, alterations, renovations or repairs to a mechanical system shall conform to that required for a new mechanical system without requiring the existing mechanical system to comply with all of the requirements of the currently adopted International Residential Code (IRC). Additions, alterations or repairs shall not cause an existing mechanical system to become unsafe, hazardous or overloaded.

Appliance Access

Appliances shall be accessible for inspection, service, repair and replacement without removing permanent construction. A catwalk or passageway shall have continuous solid flooring in accordance with the currently adopted IRC.

Clearances from Combustible Construction

There should be no less than a 1-inch space between Type B vent pipe and combustible wall surface.

Anchorage of Appliances

Appliances designed to be fixed in position shall be fastened or anchored in an approved manner.


Heating and cooling equipment and appliances shall be installed in accordance with the manufacturer’s installation instructions and the requirements of the currently adopted IRC.

Condensate Disposal

Condensate from all cooling coils or evaporators shall be conveyed from the drain pan outlet to an approved place of disposal. Condensate shall not discharge into a street, alley or other areas so as to cause a nuisance.

Insulation of Refrigerant Piping

Piping and fittings for refrigerant vapor (suction) lines shall be insulated with ¾” wall insulation.

Gas Appliances

Gas connections shall be piped by means of approved flex connector with approved ball valve type stop. Hard black pipe must extend a least 1” from unit.

Electrical Requirements

A lighting fixture controlled by a switch located at the required passageway opening and a receptacle outlet shall be provided at or near the appliance location in accordance with the currently adopted IRC. An electrical disconnect is required for equipment. Electric Branch Circuit should be connected to the H.V.A.C. unit with an approved connector or bushing. Over current protection shall comply with manufacturer’s specifications.

Note: For more information regarding references to the currently adopted International Codes, please inquire of Building Inspection staff at 972-466-3225.

Single Trade Application