46
Rev. 05/2020
47
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
Flash Curtain / Heat Shield
Principles of the Flash Curtain / Heat Shield
The purpose of the flash curtain is to decrease the
amount of smoke emitted from the door when loading
coal into the firebox. The flash curtain decreases the
size of the firebox opening, making that size more in
proportion to the area the natural draft of the chimney
will draw from. As a heat shield, the flash curtain
restricts the amount of direct heat that contacts the
firebox door directly.
Maintenance/Result
Leaving the flash curtain in place is effective for the
principles outlined above.
Removal and Replacement
1) The plate is slotted at the top and fits loosely onto
two hooks, installed above the firebox door opening.
2) With the ashes cooled down, lift up on the plate
until it releases itself from the hooks.
ABSOLUTELY NO FIRE IN THE FIREBOX WHEN
PERFORMING THIS REPAIR. ALWAYS WEAR
PROPER PERSONAL PROTECTIVE EQUIPMENT.
Flash Curtain
Proper placement of Flash Curtain