AERCO KC1000 Boiler July 2011 - Manual (Page 36)

INITIAL START-UP
4-4
NOTE:
In the following step, adjust the valve position to
13% for natural gas, or 16% for propane.
19. When the oxygen level is within the
specified range at 30%, change the valve
position to 13% for natural gas (or 16% for
propane).
20. The oxygen levels at the 13% valve position
(or 16% for propane) should be as shown in
Table 2. No adjustment should be
necessary. Contact the factory if the oxygen
or carbon monoxide levels are not within the
specified range.
Table 2
Combustion Oxygen Levels for a 13%
(Natural Gas) or 16% (Propane) Valve
Position
Inlet Air
Temp
Oxygen
(+0.2/-1.0)
Carbon
Monoxide
-20°F <12 % <50 ppm
0°F <12 % <50 ppm
10°F <12 % <50 ppm
30°F <12 % <50 ppm
50°F <11 % <50 ppm
60°F <11 % <50 ppm
70°F <11 % <50 ppm
80°F <11 % <50 ppm
90°F <10 % <50 ppm
100°F <10 % <50 ppm
21. Change the valve position to 100%. After the
combustion analyzer has settled, compare
the measured oxygen level with the levels in
Table 3.
Table 3
Combustion Oxygen Levels for a 100%
Valve Position
Inlet Air
Temp
Oxygen
(+0.2/-1.0)
Carbon
Monoxide
-20°F 6.5 % <150 ppm
0°F 6.3 % <150 ppm
10°F 6.2 % <150 ppm
30°F 5.8 % <150 ppm
50°F 5.4 % <150 ppm
60°F 5.2 % <150 ppm
70°F 5.0 % <150 ppm
80°F 4.8 % <150 ppm
90°F 4.6 % <150 ppm
100°F 4.4 % <150 ppm
22. If the measured oxygen reading is below the
oxygen range in Table 3, loosen the two
bolts that secure the inlet air shutter to the
unit using a 7/16” wrench (see Fig. 4.4).
Open the shutter 1/4” to 1/2” to increase the
oxygen level, then tighten the nuts.
23. Wait for the analyzer to settle then compare
the new oxygen reading to Table 3. Repeat
the inlet air shutter adjustment until the
oxygen is within the specified range. Firmly
tighten the inlet air shutter locking nuts when
finished.
24. If the measured oxygen reading is above the
oxygen range in Table 3, loosen the two
7/16" locking nuts securing the inlet air
shutter.
REMINDER:
At 30% valve position, adjust only the differential
pressure regulator. At 100% valve position,
adjust only the inlet air shutter.
BLOWER
OUTLET
BLOWER
INLET
SCREEN
SHUTTER
SHUTTER
LOCKING
NUTS
Figure 4.4
Air Shutter Locking Nut Location
25. Close the air shutter 1/4” to 1/2” to decrease
the oxygen level and tighten the two nuts.
26. Allow the analyzer to settle then compare
the new oxygen reading to Table 3.
27. Repeat the adjustment until the oxygen is
within the specified range. Firmly tighten the
inlet air shutter locking nuts when finished.