52
Rev. 05/2020
Combustion Air Tube
Principle
The combustion air tube allows air flow from the airbox
to the ashpan. It helps to provide combustion air into
the ashpan, through the grates and to the bottom of the
charge of wood.
Maintenance
Maintenance should be completed regularly to ensure
no ash has accumulated inside the combustion air tube,
limiting airflow. If the furnace does not have proper airflow, the combustion efficiency is
reduced, resulting in increased smoke and creosote.
Automatic Fan Switch (A.F.S.)
The Automatic Fan Switch must operate correctly for safe
operation of the Heatmor.
Principle
The fan switch turns the fan on while the outer door is
opened to clear the possible excess fuel build up in the
firebox. Along with normal recommended, safe firebox door
opening practices, the risk of a flash back is greatly reduced.
Operation
The Automatic Fan Switch automatically turns on the
fan when the front outer door is open. The Automatic
Fan Switch can be over ridden by the Front light and Combustion Air Blower Control Switch
and the high limit will also override the Automatic Fan Switch.
Maintenance/Result
Ensure that the outer door closes properly to activate the Automatic Fan Switch. If the
outer door does not close properly the switch could stay in the “fan on” position or if
the Automatic Fan Switch fails in the “fan on” position, the Heatmor combustion fan will
continue to run until the high limit is tripped. Ensure that the Automatic Fan Switch is
working properly: if the Heatmor is off when you approach the Heatmor, the fan
should come on when you open the outer door, if it does not, then your Automatic Fan
Switch has failed in the “fan off” position.
Combustion Air Tube
Automatic Fan Switch
