21
Force 30 Owners Manual
2015
Testing Location
Flue Gas Analysis
NOTE: THE FURNACE AND CHIMNEY WILL BE HOT DURING THIS TEST!
Once the furnace is installed, it must be adjusted to proper burn settings. A flue gas instrument needs to be
used that can read the following values: Draft, O2%, CO2%, PPM CO and stack temp. The sample is to be taken
directly behind the tube access box, in the port provided on the exhaust outlet. Northwest Manufacturing rec
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ommends using a Testo 327, 310 or 320 hand held flue gas instrument.
NOTE: Make sure the flue gas instru
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ment used supports biomass fuels, otherwise damage to the instrument may occur. Ensure there is enough
heat load to allow for a long burn. Tuning of the burner may take a few hours.
Measure and set the draft of the furnace prior to running the flue gas analysis. the draft is to be between -.18
and -.12 inches of water.
The target value for oxygen that you are trying to reach is: O2: 6-10.5%the O2 value is the average over a one
hour continuous burn. The value will fluctuate slightly during the duration of the burn. It is recommended to
wait 3-5 minutes between adjustments to give the burner time to react to the adjustments. Shorter on/off
time intervals will result in a more even and efficient burn. When adjusting to the oxygen level, if the O2 level
is below the target values, less fuel is needed, if it is above the target values, more fuel is needed.
Note: The boiler should be readjusted each time a new brand of pellets is used.
The target stack temp is between 300 and 350 degrees Fahrenheit. It is possible to have proper O2 values with
too high of a stack temp. Reduce the fuel rate to lower the stack temp. The low setting on the burner may
need to be used to reduce the air flow and achieve a proper burn. The full 100,000 btu of output is possible in
both low and high burner settings. Environmental conditions such as humidity, temperature and elevation will
also affect the burner. 12-14 Pounds of pellets will normally be consumed for one hour on a full burn. If fuel is
used at a higher rate, the stack temp will increase and the efficiency of the heat exchanger will be reduced.
Once the burner has been properly tuned, fill out the warranty registration card at the back of this manual and
return it to Northwest Manufacturing.
Installation