Aerco KC Series Operation And Maintenance Manual

INITIAL START-UP
4-4
15. If the measured oxygen level is above the
oxygen range in Table 1, rotate the differen-
tial regulator adjustment tool clockwise 1/4
to 1/2 revolution to increase gas flow.
16. Wait for the analyzer reading to settle, then
compare the new reading to Table 1. Repeat
adjustment until oxygen is within the speci-
fied range.
NOTE:
Adjust only the differential regulator at 30%
control signal; do not adjust the air shutter.
17. Once the oxygen level is within the specified
range at 30%, change the firing rate to 16%.
18. Oxygen levels at the 16% firing rate 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 16%
Firing Rate
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
19. Change the firing rate to 100%. After the
combustion analyzer has settled, compare
the measured oxygen level with the levels in
Table 3.
20. 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.
21. Wait for the analyzer to settle and 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.
Table 3
Combustion Oxygen Levels for a 100%
Firing Rate
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
REMINDER:
At 30% firing rate adjust only the differential
pressure regulator. At 100% firing rate, adjust
only the inlet air shutter.
BLOWER
OUTLET
BLOWER
INLET
SCREEN
SHUTTER
SHUTTER
LOCKING NUTS
Figure 4.4
Air Shutter Locking Nut Location
22. 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. Close the air shutter 1/4” to 1/2” to
decrease the oxygen level and tighten the
two nuts.
23. Allow the analyzer to settle and then
compare the new oxygen reading to Table 3.
24. Repeat the adjustment until the oxygen is
within the specified range. Firmly tighten the
inlet air shutter locking nuts when finished.

Aerco KC Series Specifications

General

Brand	Aerco
Model	KC Series
Category	Water Heater
Language	English