ANSI/IAS U.S. LC 2-1996 (R2020)

Preface This publication represents a basic standard for safe operation, substantial and durable construction, and acceptable performance of direct gas-fired circulating heaters for agricultural animal confinement buildings. It is the result of years of experience in the manufacture, testing, installation, maintenance, inspection and research on direct gas-fired circulating heaters for agricultural animal confinement buildings designed for the utilization of gas. There are risks of injury to persons inherent in some appliances that, if completely eliminated, would defeat the utility of the appliance. The provisions in this Standard are intended to reduce such risks while retaining the normal function of the appliance. Nothing in this standard is to be considered in any way as indicating a measure of quality beyond compliance with the provisions it contains. It is designed to allow compliance of direct gas-fired circulating heaters for agricultural animal confinement buildings, the construction and performance of which may exceed the various provisions specified herein. In its preparation, full recognition has been given to possibilities of improvement through ingenuity of design. As progress takes place, revisions may become necessary. When they are believed desirable, recommendations should be forwarded to International Approval Services - U.S., Inc., 8501 East Pleasant Valley Road, Cleveland, Ohio 44131. A proposal form is provided in the back of this document. Safe and satisfactory operation of direct gas-fired circulating heaters for agricultural animal confinement buildings depends to a great extent upon its proper installation, and it should be installed in accordance with the National Fuel Gas Code, ANSI Z223.1, manufacturers’ installation instructions, and local municipal building codes. Scope 1.1.1 This standard applies to newly-produced direct gas-fired circulating heaters (see Part IV, Definitions) of 400,000 Btu (117 228 W) or less, hereinafter referred to as heaters, constructed entirely of new, unused parts and materials and primarily intended for permanent installation in agricultural animal confinement buildings. All the products of combustion generated by the heater are released into the area being heated. These requirements apply to heaters having a gas supply pressure rating not exceeding 1/2 psi (3.45 kPa) at the gas inlet of the appliance. 1.1.2 This standard does not apply to heaters intended for use in greenhouses. 1.1.3 This standard applies to self-contained heaters with integral means for air circulation. 1.1.4 This standard does not cover heaters employing a flameless catalytic combustion process, heaters for use with liquid phase fuel gases or infrared type heaters. 1.1.5 This standard applies to heaters having an air outlet temperature of 350°F (176.5°C) above room temperature or less (see 2.8.2). 1.1.6 Special construction provisions applicable to a heater for outdoor installation are outlined under 1.2.5, 1.3.5, 1.3.6, 1.5, 1.7.3, 1.9.3-2b and 1.22.4. 1.1.7 Heaters covered by this standard are intended for use with natural or liquefied petroleum gases. The construction of heaters for use with the above-mentioned gases is covered under Part I. The performance of heaters for use with the above-mentioned gases is covered under Part II. 1.1.8 Special construction provisions for heaters intended for installations subject to spray washdown are outlined under 1.2.7 and 1.21.1. 1.1.9 Exhibit A contains a list of standards specifically referenced in this standard, and sources from which these reference standards may be obtained. 1.1.10 If a value for measurement as given in this standard is followed by an equivalent value in other units, the first stated value is to be regarded as the specification. 1.1.11 All references to psi throughout this standard are to be considered gage pressure unless otherwise specified.