48
Rev. 05/2020
Sand
Principles of Sand in the Base of the Firebox
The HEATMOR™ furnace, in boiler terms, is a “dry
base boiler.” This is to say there is no HTF around
the base of the firebox. The firebrick and sand hold
and release heat to the firebox during the off cycle.
This shortens the time when smoke will be emitted.
A sand base provides complete corrosion protection
to the most corrosion prone area of a furnace.
Maintenance/Result
The sand should never need to be removed. When stirring the ashes, rake only the area
over the grates. There is no need to stir the areas where the sand is located. Maintain
the sand level to the top of the grates. Check the level on a yearly basis and add sand if
necessary. Refer to page 19 for types of sand to use.
Removal and Replacement
1) Allow the ashes to extinguish and then remove all the ashes from the firebox.
2) Allow the HTF to cool down.
3) One person should get into the firebox and with a small scoop, remove the sand from
around the ash pit.
4) Replace as above.
Sand
