OPERATING YOUR BOILER (continued) PAGE 41
Lighting the Boiler for the First Time (continued)
Remember that once you turn the power on to activate the fan, the low temperature flue gas
sensor must sense flue gas temperatures of 120°C (250°F) within 15 minutes or it will cut power to
the fan. Any time the fan is powered to burn wood, the flue gas sensor must sense temperatures
of 120°C (250°F) within 15 minutes or it will shut the fan off.
WARNING: If there is a fire in the firebox, do not leave the boiler with the power switch
“OFF”. This must be “ON” so the overheat circuit can function, if necessary.
CAUTION: The Firing and Ash doors must remain closed except when loading fuel or
removing ash. Door gasket seals are very important to the operation of your
boiler. They must be maintained in good condition and replaced if necessary
in order to maintain an “air tight” seal.
Primary Air Adjustment
The primary air should be set to open fully when the draft fan is running. However, if you are
regularly seeing temperatures at the flue collar of the boiler of over 600°F when the boiler is
clean, we suggest decreasing the primary air to lower the flue temperature. Adjust the stop in
front of the draft fan under the top front jacket panel. Loosen the locking nut and turn the bolt in
for less primary air lowering the flue temperature to approximately 600°F. Tighten the locking
nut when adjusted properly.
Secondary Air Adjustment
Correct secondary air adjustment is essential for optimum combustion and efficiency.
Adjustment is by means of the bakelite knob on the front of the boiler next to the top left corner
of the ash door. To adjust, pull the knob down and slide left (more air) or right (less air). The
drier the wood is, the more secondary air required.
The primary air coming through the holes behind the loading door and the total quantity of air
should normally not have to be changed if the boiler is kept clean.
After approximately 45 minutes of operation with a load of wood, the boiler and refractory
should be heated. Observe the flame through the observation port or open the lower door
carefully while the fan is still running
. Adjust the secondary air as needed. Once the proper
adjustment has been set it should only be necessary to re-adjust when changing the type or
quality of fuel. Use diagrams on page 42 to help guide you in setting the secondary air.
Until you know your boiler well, you can use the basic rule of “dry wood/more secondary air----
greener wood/less secondary air, or put it in the middle and forget about it.”
41
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