10
Updated: 07/10/12
Secondary Air Box
Operation
The Secondary Airbox is located along the rear, interior, firebox wall.
it is a means to direct air from the secondary combustion air blower to
the upper area of the firebox. This is how smoke from the fire can be
ignited. Do not stack anything over the opening of the secondary airbox
as poor combustion could occur.
Anti-Rollout Device (A.R.D.) and Auger Tube
THE A.R.D. MUST OPERATE PERFECTLY OR PROBLEMS QUICKLY ARISE.
Anti-Rollout Device
Principle
The Anti-Rollout Device (A.R.D.) is a safety feature that allows air into the firebox before the main fire door is
opened. Along with normal, recommended, safe fire door opening practices, the risk of a flash back is greatly
reduced.
Operation
The A.R.D. opens and closes automatically with the operation of
the outer door.
Maintenance / Result
Ensure ash, shavings or small wood pieces do not become
lodged in the A.R.D. make sure that the spring on the auger
tube cover is working properly. This ensures a compression fit
of the cover to the auger tube. if the A.R.D. is not closing 100
percent, a constant air leak will allow air to continually fuel
the fire. This will cause a smoldering fire resulting in creosote,
boiling, and premature warping of the ashpan grates.
Ash Auger Tube
Principles
The Anti-Rollout Device also serves as the ash auger tube. Opening the outer door will expose the auger tube.
The auger tube cover is located under the front outer door of the furnace.
The cover must have a good seal
against the auger tube.
