Heatmor 400-4S, User Manual

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Standard Grates
Standard Grates and Insulation
Principles of the Standard Grates and Insulation
Grates allow combustion air from the combustion air blowers to
pass from below the grates, up through the grates, through a
shallow depth of ashes and then to the bottom of the burning fire.
This way the ashes will burn completely into a fine powder that will
flow through the grates into the ash pit. Because air is being forced through the
ashes, the glowing embers will be more apt to ignite and set the wood ablaze.
The insulation keeps heat in the firebox and acts as a spacer for the grates.
Maintenance/Result
1) Never make the slots in the grates wider than factory dimensions. If
hot coals can pass through the grates, warping of the grates may result.
2) Make sure the grates are always resting in the grooves of the ash
pit. If the grates move out of place, it may result in hot coals slipping
under the grates causing warpage of the grates.
3) Make sure the narrow side of the slot is next to the fire.
4) Replace broken grates immediately or a chain reaction of broken grates may result.
5) The grates will not break under reasonable knocks of heavy wood.
Removal and Replacement
1) Allow the ashes to burn completely and extinguish.
2) Push the ashes to the back of the firebox or remove all the
ashes from the firebox.
3) Run a small prybar around the perimeter of the grate and the
edge of the ash pit to loosen the grate.
4) Lift out the broken grate.
5) Replace the insulation by which the new grate will sit if
needed.
6) Install the new grate. Make sure to install the new grate with
the narrow width of the slot towards the fire.
Note: There are 4 full grates and one half grate in the model 400-4S. The insulation is 1” lined on each side of
the grates.
ABSOLUTELY NO FIRE IN THE FIREBOX WHEN PERFORMING
THIS REPAIR. DO NOT PERFORM THIS REPAIR WHEN UNIT
WATER TEMPERATURE IS UNSAFE. ALWAYS WEAR PROPER
PERSONAL PROTECTIVE EQUIPMENT.
Half Grate