AERCO KC1000 Heater w/Mod-Box Controller - Manual (Page 25)

INITIAL START-UP
20
clockwise, 1/4-1/2 turns, 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
specified 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 20%.
18. Oxygen levels at the 16% firing rate should be
10% or less as shown in Table 2. If the
measured oxygen level is less then 10%, no
adjustment is necessary. If the measured
oxygen levels are greater than 10%, rotate the
regulator adjustment tool clockwise 1/4 to 1/2
revolution to add gas.
19. Wait for the analyzer to settle. Repeat
adjustment until the measured oxygen reading
is 10% or less.
20. If the oxygen level cannot be brought to 10%
or less, check the oxygen level in 1%
increments above the 16% firing rate until an
oxygen level of 10%, or less, is measured.
Reset the unit’ stop level at that firing rate. Go
back and recheck the oxygen level at 30%
before continuing.
Table 2
Inlet Air
Temp
Oxygen Carbon
Monoxide
20
o
F 10% or less <25ppm
40
o
F 10% or less <25ppm
60
o
F 10% or less <25ppm
80
o
F 10% or less <25ppm
100
o
F 10% or less <25ppm
Combustion Oxygen Levels for a 20%
Firing Rate
21. Change the firing rate to 100%. After the
combustion analyzer has settled, compare
the measured oxygen level with the levels in
Table 3.
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.
Table 3
Inlet Air
Temp
Oxygen Carbon
Monoxide
20
o
F 5.4% <150ppm
40
o
F 5.4% <150ppm
60
o
F 5.2% <150ppm
80
o
F 4.9% <150ppm
100
o
F 4.7% <150ppm
Combustion Oxygen Levels for a 100%
Firing Rate
REMINDER:
At 30% firing rate adjust only the differential
pressure regulator. At 100% firing rate,
adjust only the inlet air shutter .
SCREEN
SHUTTER
SHUTTER LOCKING
NUTS
BLOWER INLET
BLOWER OUTLET
Figure 4.4
Air Shutter Locking Nut Location
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. Close the air shutter 1/4” to 1/2” to
decrease the oxygen level and tighten the
two nuts.
25. Allow the analyzer to settle, then compare
the new oxygen reading to Table 3.