scope:

PREFACE

This publication represents a standard for safe operation, substantial and durable construction, and acceptable performance for gas appliance thermostats. It is the result of years of experience in the utilization of gas, supplemented by extensive research and is intended to provide for the safe performance and substantial and durable construction of such gas appliance thermostats.

Nothing in this standard is to be considered in any way as indicating a mearure of quality beyond compliance with the provisions it contains. It is designed to allow compliance of gas appliance theremostats, 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 belived desirable, recommendations should be forwarded to the Chairman of Accredited Standards Committee Z21, 8501 East Pleasant Valley Road, Cleveland, Ohio 44131.

 Safe and satisfactory operation of a gas appliance theremostat depends to a great extent upon its proper installation, and it shoul d be installed in accordance with the manufacturers' installation instructions.

Users of this American National Standard are advised that the devices/products/activities within its scope may be subject to regulation at the Federal, 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, state, or local regulation should be followed.