Heatmor 100 CSS - C Combustion Air Percentage Tube; D Automatic Fan Switch (A.F.S.)

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Combustion Air Restrictor Tube
Principle
The combusion air restrictor tube allows air ow from the airbox
to the ashpan. It helps to provide combusion air into the ashpan,
through the grates and to the bottom of the charge of wood.
Operation
The combustion air restrictor tube is designed with a restrictor
inside of the tube. This feature is installed on all standard wood
burning HEATMOR™ furnaces. This restrictor helps to divert
combustion air above the grates as well as allow proper airow
to the underside of the grates.
This standard setup is for wood burning. If coal is going to be
burned, the restrictor must be removed to allow more under
grate airow and less over grate airow. This is done by
removing the combustion blower/ipper assembly and using a
small prybar to remove the restrictor.
Maintenance
Maintenance should be completed regularly to ensure no ash has
accumulated inside the combustion air restrictor tube, limiting airow.
If the furnace does not have proper airow, the combustion
efciency 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 rebox. Along with normal recommended, safe rebox door opening practices, the risk of a ash
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 Restrictor Tube