What must be interlocked with the firing cycle in appliances served by combustion air openings with smoke dampers?

When it comes to appliances that are served by combustion air openings with smoke dampers, interlocking the appliance itself with the firing cycle is essential for ensuring safety and compliance with mechanical codes. The reason this interlock is necessary is because the smoke dampers are designed to close in the event of smoke detection, thus preventing harmful exhaust gases from entering occupied spaces.

By interlocking the appliance with its firing cycle, the appliance will be automatically disabled if the smoke dampers close. This helps to prevent a dangerous situation where the appliance continues to operate and generate harmful emissions despite the dampers being shut, which would compromise indoor air quality and safety.

Additionally, this method of interlock ensures that the appliance is only operational when there is sufficient combustion air provided through the openings, allowing for safe and efficient operation. Recognizing the critical role the interlock plays in managing the operation of appliances in environments where smoke dampers are present is key for anyone working with these systems.