前言这是ANSI Z83的第三版。25/CSA 3.19，直接燃气工艺空气加热器标准。它取代了2015年出版的前一版。范围1。1本标准适用于新生产的直接燃气循环式或非循环式工艺空气加热器（见第3条定义），以下简称加热器，其主要目的是为商业和工业建筑内的非占用空间提供工艺加热，还可能包括作为非循环通风空气加热器运行（见第3条），前提是加热器在占用空间期间运行。本标准所涵盖的加热器的最高排放温度限制为250℃？F（121摄氏度）。本标准涵盖的加热器不适用于任何有睡眠区的区域。安装符合当地规范，或在没有当地规范的情况下，符合国家燃气规范ANSI Z223。 1，或天然气和丙烷安装规范，CAN/CSA B149。1.本标准仅适用于带有整体空气移动部件的成套加热器，即由制造商设计、编目和重复制造的加热器。1.2当加热器在该加热器服务的空间内与人员一起运行时，其配置应确保加热器运行的性能窗口符合与本标准中包含的通风空气加热器模式相关的适用规定。1.3当加热器在烘烤循环模式下运行时，加热器产生的燃烧副产物尚未定义，因为其仅在非占用状态下运行。1.4当加热器用作喷漆室加热器时，必须在喷涂操作期间作为非循环通风空气加热器运行，并可在烘焙或干燥模式下作为循环加热器运行，前提是满足第4条中规定的所有条件。 满足1.11、4.1.12、4.15.3、4.15.12、4.15.13、4.15.14、4.21.12、4.21.13、4.21.14、4.21.15、4.21.16、4.21.17、4.21.18、4.21.19和4.21.20（如适用）。1.5仅在烘焙循环模式下运行（不在占用模式下运行）的工艺空气加热器无需符合以下构造规定:第4.15.5-b）条和第4.21.1-m）-iii）条。1.6如果本标准中给出的测量值后跟其他单位中的等效值，则第一个规定值应视为规范。1.7美国独有的项目见第6.1.8条加拿大独有的项目见第7.1.9条“参考出版物”。第2条“参考出版物”包含本标准中特别引用的标准列表，以及这些引用标准的来源。1.10除非另有规定，否则本标准中提及的所有“psi”均应视为表压。1. 11在本标准中，“应”用于表示要求，即用户有义务满足的规定，以符合本标准；“应该”用于表示建议或建议但不需要的建议；“可”用于表示一个选项或在标准范围内允许的选项。注释随附条款不包括要求或替代要求；随附条款的注释的目的是将解释性或信息性材料与文本分开。表和图的注释被视为表或图的一部分，可以作为要求编写。附件被指定为规范性（强制性）或信息性（非强制性）以定义其应用。

PrefaceThis is the third edition of ANSI Z83.25 / CSA 3.19, Standard for Direct gas-fired process air heaters. It supersedes the previous edition published in 2015.Scope1.1This Standard applies to newly produced, direct gas-fired process air heaters of the recirculating or non- recirculating type (see Clause 3, Definitions), hereinafter referred to as heaters, whose primary purpose is to provide process heating to non-occupied spaces within commercial and industrial buildings and may also include operation as a non-recirculating ventilation air heater (see Clause 3), if the heater is operated during periods when the space is occupied.Heaters covered under this Standard are limited to a maximum discharge temperature of 250?F (121?C).Heaters covered by this Standard are not intended for use in any area containing sleeping quarters. The installation conforms with local codes, or in the absence of local codes, in accordance with the National Fuel Gas Code, ANSI Z223.1, or the Natural Gas and Propane Installation Codes, CAN/CSA B149.1.This Standard is intended to cover only complete packaged heaters with integral air moving components, i.e., those which are designed by, cataloged by, and built on a repetitive basis by the manufacturer.1.2When the heater operates with people present within the space being served by this heater, it is configured so that the performance window of the heater operation will be in compliance with the applicable provisions associated with the ventilation air heater mode contained in this Standard.1.3When the heater is operated in the bake cycle mode, the combustion by-products generated by the heater have not been defined since it is intended to operate in this mode in the non-occupied condition only.1.4When the heater is utilized as a paint booth heater, it must be operated as a non-recirculating ventilation air heater during the spraying operation and may be operated as a recirculating heater in the bake or drying mode provided all of the conditions identified in Clauses 4.1.11, 4.1.12, 4.15.3, 4.15.12, 4.15.13, 4.15.14, 4.21.12, 4.21.13, 4.21.14, 4.21.15, 4.21.16, 4.21.17, 4.21.18, 4.21.19, and 4.21.20, if applicable, are met.1.5Process air heaters that operate in the bake cycle mode only (does not operate in the occupied mode) are not required to comply with the following construction provisions: Clauses 4.15.5-b) and 4.21.1-m)-iii).1.6If 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.1.7Items unique to the U.S.A. are shown in Clause 6.1.8Items unique to Canada are shown in Clause 7.1.9Clause 2, Reference publications, contains a list of standards specifically referenced in this Standard, and sources from which these referenced standards may be obtained.1.10All references to "psi" through this Standard are to be considered gage pressure unless otherwise specified.1.11In this Standard, "shall" is used to express a requirement, i.e., a provision that the user is obliged to satisfy in order to comply with the standard; "should" is used to express a recommendation or that which is advised but not required; "may" is used to express an option or that which is permissible within the limits of the standard.Notes accompanying clauses do not include requirements or alternative requirements; the purpose of a note accompanying a clause is to separate from the text explanatory or informative material.Notes to tables and figures are considered part of the table or figure and may be written as requirements.Annexes are designated normative (mandatory) or informative (non-mandatory) to define their application.