OPERATING YOUR BOILER (continued) PAGE 47
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OPERATIONAL PROCEDURES WHEN A HEAT STORAGE TANK IS CONNECTED (continued)
7. Clean the boiler frequently as per the instructions elsewhere in this manual (see pages
51 and 52). Routine cleaning will help maintain boiler efficiency. Accumulated ash and
soot act as an insulator and reduce boiler heat exchange efficiency.
8. Turbulators can be inserted into the wood heat exchange tubes if you have good
chimney draft. Turbulators significantly increase boiler heat exchange efficiency.
COMBUSTION PROCESS
The Tarm EXCEL boiler has excellent combustion efficiency. Pollution of the boiler (except the
firebox), chimney, and environment is kept to an absolute minimum.
NOTE: Your firebox will form creosote on the walls. However, this normally has no effect
on the boiler and does not need to be removed unless you develop a build-up of
more than ½”. During combustion, when the draft fan is running, gases and
smoke are created which make up the main part of the wood’s heat value.
Formic and acetic acids and other gases are mixed with the right quantity of
combustion air at very high temperatures producing combustion efficiencies of
80% or more. This highly efficient combustion process produces virtually no
smoke or creosote.
When the boiler gets up to temperature, the draft fan shuts down and stops the supply of
combustion air to the firebox. The fire shuts down due to the lack of oxygen and does not continue
smoldering to cause smoke, creosote or overheating. When the boiler temperature drops, the fan
will turn on re-igniting the coals which have been resting on the refractory. During the off cycle, the
coals stay hot enough to burn but they will be dormant because of the lack of oxygen. The
combustion process of the Tarm EXCEL allows you to burn wood as efficiently, as clean and as
controlled as many fossil fuel heating systems.
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