1.1 本规程涵盖暖通空调（HVAC）详细工程图纸上使用的符号。 1.2 这些符号在合同和初步设计图纸上可能有用。 1.3 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 =====意义和用途====== 2.1 当本标准未涵盖的项目需要符号表示时，应充分识别符号的字符，并仅对其进行一种解释。如有必要，应在符号上附加注释，以进一步明确。 2.2 符号表示不需要实际系统的精确布局或比例布局。因此，符号可用于系统布局的所有视图。

1.1 This practice covers symbols used on heating, ventilation, and air conditioning (HVAC) detailed engineering drawings. 1.2 These symbols may be useful on contract and preliminary design drawings. 1.3 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 2.1 When symbolic representation is required for an item not covered in this standard, the character of the symbol shall be adequately identified and shall be subject to one interpretation only. If necessary, a note shall be attached to the symbol for further clarity. 2.2 Symbolic representation does not require exact or scale layouts of the actual system. Therefore, the symbols may be used in all views of the system layout.