序言这是CSA/ANSI Z21的第一版。23/CSA 6.6，燃气设备恒温器。它取代了ANSI Z21。23-2010，燃气器具恒温器和CAN1-6.6-M78，燃气器具恒温器。本标准的制定符合加拿大标准委员会对加拿大国家标准的要求。CSA集团已将其作为加拿大国家标准发布。本标准已被美国国家标准协会（ANSI）批准为美国国家标准。本标准适用于本标准规定范围内的合格评定。范围1。1本标准适用于最大工作气体压力为1/2 psi（3。 5 kPa）或电动型（见第3条），完全由新的、未使用的零件和材料制成。本标准不适用于远离设备安装的电动舒适加热恒温器（壁挂式）。当恒温器的工作性能特性可能受到单独部件（如电源、变压器和阀门）的影响时，应将恒温器作为完整系统的一部分进行测试。设备符合本标准并不意味着该设备可用于燃气设备，无需对应用于特定设备设计的设备进行补充测试。1.2作为恒温器组成部分的附件应符合该装置适用标准的所有规定。 1.3除非另有规定，本标准中提及的所有psi均视为表压。1.4在本标准中，“应”用于表示要求，即用户为遵守本标准而有义务满足的规定；“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。1.5以英制单位给出的数值为本标准中的记录单位。括号中给出的值仅供参考和比较。注:见附件B。

PrefaceThis is the first edition of CSA/ANSI Z21.23/CSA 6.6, Gas appliance thermostats. It supersedes both ANSI Z21.23-2010, Gas appliance thermostats, and CAN1-6.6-M78, Gas appliance thermostats. This Standard has been developed in compliance with Standards Council of Canada requirements for National Standards of Canada. It has been published as a National Standard of Canada by CSA Group. This Standard has been approved by the American National Standards Institute (ANSI) as an American National Standard. This Standard is considered suitable for use for conformity assessment within the stated scope of the Standard.Scope1.1 This Standard applies to newly produced gas appliance thermostats of the integral gas valve type having a maximum operating gas pressure of 1/2 psi (3.5 kPa) or electric type (see Clause 3), constructed entirely of new, unused parts and materials. This Standard does not apply to an electric type comfort heating thermostat (wallmounted) for installation remote from an appliance. When the operating performance characteristics of the thermostat can be affected by the separate components, such as power supply, transformer, and valve(s), the thermostat is to be tested as part of a complete system. Compliance of a device with this Standard does not imply that such device is acceptable for use on gas appliances without supplemental tests with the device applied to the particular appliance design.1.2 An accessory incorporated as an integral part of a thermostat is to comply with all provisions of the applicable standard for such a device.1.3 All references to psi throughout this Standard are considered gauge pressures, unless otherwise specified.1.4 In 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; and "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.1.5 The values given in imperial units are the units of record for the purposes of this Standard. The values given in parentheses are for information and comparison only. Note: See Annex B.