The new edition includes the following changes in requirements:
• Additional marking and instruction requirements were added to Section 7;
• The electrical construction requirements were revised to reflect present practices in the U.S. and Canada;
• Addition of mounting, maintenance and servicing requirements in 11.11;
• Addition of requirements covering protection against humid conditions in 12.2;
• Addition of requirements covering the electric strength and insulation resistance tests in section 13.2;
• Modification and addition of coverage for Timing, Sequence & Flame detector characteristics in Section 15;
• Addition of coverage for actuating members and actuating means in Section 18.9;
• Addition of requirements covering pilot burners and other components in Section 29A;
• Addition of requirements to the manufacturing and production tests;
• Miscellaneous clarifications and corrections.