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PREFACE

This publication represents a basic standard for safe operation, substantial and durable construction, and acceptable performance of automatic gas shutoff devices for hot water supply systems. It is the result of years of experience in the manufacture, testing, installation, maintenance, inspection and research on automatic gas shutoff devices for hot water supply systems. There are risks of injury to persons inherent in appliances that, if completely eliminated, would defeat the utility of the appliance. The provisions in this standard are intended to help reduce such risks while retaining the normal operation 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 automatic gas shutoff devices for hot water supply systems, the safety construction and performance of which may exceed the various provisions specified herein. In its preparation, 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 or suggestions should be forwarded to the Chairman of Accredited Standards Committee Z2l/83, 8501 East Pleasant Valley Road, Cleveland, Ohio 44131, or the Chairman of (Interim CSA) Gas Equipment Standards Steering Committee, 178 Rexdale Boulevard, Etobicoke, Ontario, Canada M9W 1R3.

Safe and satisfactory operation of automatic gas shutoff devices for hot water supply systems depends to a great extent upon its proper installation, use and maintenance. It should be installed, as applicable, in accordance with the National Fuel Gas code, ANSI Z223.1; the Natural Gas Installation code, CAN/CGA-B149.1; the Propane Installation Code, CAN/CGA-B149.2.

 Users of this American National Standard/CSA Standard are advised that the devices, products and activities within its scope may be subject to regulation at the Federal, Territorial, Provincial, state or local level. Users are strongly urged to investigate this possibility through appropriate channels. In the event of a conflict with this standard, the Federal, Territorial, Provincial, state or local regulation should be followed.

THIS STANDARD IS INTENDED TO BE USED BY THE MANUFACTURING SECTOR AND BY THOSE APPLYING THE EQUPMENT AND BY THOSE RESPONSIBLE FOR ITS PROPER INSTALLATION. IT IS THE RESPONSIBILITY OF THESE USERS TO DETERMINE THAT IN EACH CASE THIS STANDARD IS SUITABLE FOR AND APPLICABLE T0 THE SPECIFIC USE THEY INTEND.