er air setting may be determined by
observing the fire through the observation port on the
front of the boiler. If the flame is smoky, the air shutter
should be opened until the fire burns clean, without any
trace of smoke. The flame should be bright yellow in color
with the tips of the flame turning orange. If the flame is
too white, reduce the amount of air admitted; and, if too
red or smoky increase the air.

3. Final adjustments should be made using a flue gas
analyzer to measure the CO_2 content of the flue gas and
a Bacharach model smoke meter or equivalent to determine
the amount of smoke (not to exceed a "TRACE").

For checking efficiency only the stack temperature and
CO_2 may be taken immediately after the fan and refer to
the standard efficiency charts for the results. Readings
of 5 to 8% taken after the fan correspond to 10 to 12%
taken in the rear uptake of the boiler.

The reduction in CO_2 reading in the flue is caused by
the air being drawn in around the motor shaft for cooling
purposes. The motor cooling air is at ambient temperature
and, therefore, does not add energy to or subtract energy
from the flue gas analysis, it only adds volume to the flue
gas. Therefore, applying this data to standard efficiency
charts will give a true indication of flue gas loss.

+---------------------------------------------+
| |
| NOTE |
| |
| Final adjustment should be made after |
| the burner has been firing continuously |
| for at least 10 minutes, as the fan pulls |
| less air when the flue gases are hot. |
| |
+---------------------------------------------+

A. CHECK LIMIT CONTROL

Run the burner long enough to bring the water temperature up to at least
190 degrees then turn the limit control setting until the burner stops.

+---------------------------------------------------+
| |
| NOTE |
| |
| The Minimum limit setting for any hot water |
| boiler should be 140 degrees F. in order to